17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5d8aa0f5aSsudheer * Common Development and Distribution License (the "License"). 6d8aa0f5aSsudheer * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 2197eda132Sraf 227c478bd9Sstevel@tonic-gate /* 235cd376e8SJimmy Vetayases * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved. 247c478bd9Sstevel@tonic-gate */ 257c478bd9Sstevel@tonic-gate 267c478bd9Sstevel@tonic-gate /* Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */ 277c478bd9Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990 AT&T */ 287c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 297c478bd9Sstevel@tonic-gate /* */ 307c478bd9Sstevel@tonic-gate /* Copyright (c) 1987, 1988 Microsoft Corporation */ 317c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 327c478bd9Sstevel@tonic-gate /* */ 337c478bd9Sstevel@tonic-gate 34f16a0f4cSRobert Mustacchi /* 3569c92249SBryan Cantrill * Copyright 2012 Joyent, Inc. All rights reserved. 36f16a0f4cSRobert Mustacchi */ 37f16a0f4cSRobert Mustacchi 387c478bd9Sstevel@tonic-gate #include <sys/types.h> 397c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h> 407c478bd9Sstevel@tonic-gate #include <sys/param.h> 417c478bd9Sstevel@tonic-gate #include <sys/signal.h> 427c478bd9Sstevel@tonic-gate #include <sys/systm.h> 437c478bd9Sstevel@tonic-gate #include <sys/user.h> 447c478bd9Sstevel@tonic-gate #include <sys/proc.h> 457c478bd9Sstevel@tonic-gate #include <sys/disp.h> 467c478bd9Sstevel@tonic-gate #include <sys/class.h> 477c478bd9Sstevel@tonic-gate #include <sys/core.h> 487c478bd9Sstevel@tonic-gate #include <sys/syscall.h> 497c478bd9Sstevel@tonic-gate #include <sys/cpuvar.h> 507c478bd9Sstevel@tonic-gate #include <sys/vm.h> 517c478bd9Sstevel@tonic-gate #include <sys/sysinfo.h> 527c478bd9Sstevel@tonic-gate #include <sys/fault.h> 537c478bd9Sstevel@tonic-gate #include <sys/stack.h> 547c478bd9Sstevel@tonic-gate #include <sys/psw.h> 557c478bd9Sstevel@tonic-gate #include <sys/regset.h> 567c478bd9Sstevel@tonic-gate #include <sys/fp.h> 577c478bd9Sstevel@tonic-gate #include <sys/trap.h> 587c478bd9Sstevel@tonic-gate #include <sys/kmem.h> 597c478bd9Sstevel@tonic-gate #include <sys/vtrace.h> 607c478bd9Sstevel@tonic-gate #include <sys/cmn_err.h> 617c478bd9Sstevel@tonic-gate #include <sys/prsystm.h> 627c478bd9Sstevel@tonic-gate #include <sys/mutex_impl.h> 637c478bd9Sstevel@tonic-gate #include <sys/machsystm.h> 647c478bd9Sstevel@tonic-gate #include <sys/archsystm.h> 657c478bd9Sstevel@tonic-gate #include <sys/sdt.h> 667c478bd9Sstevel@tonic-gate #include <sys/avintr.h> 677c478bd9Sstevel@tonic-gate #include <sys/kobj.h> 687c478bd9Sstevel@tonic-gate 697c478bd9Sstevel@tonic-gate #include <vm/hat.h> 707c478bd9Sstevel@tonic-gate 717c478bd9Sstevel@tonic-gate #include <vm/seg_kmem.h> 727c478bd9Sstevel@tonic-gate #include <vm/as.h> 737c478bd9Sstevel@tonic-gate #include <vm/seg.h> 747c478bd9Sstevel@tonic-gate #include <vm/hat_pte.h> 75ae115bc7Smrj #include <vm/hat_i86.h> 767c478bd9Sstevel@tonic-gate 777c478bd9Sstevel@tonic-gate #include <sys/procfs.h> 787c478bd9Sstevel@tonic-gate 797c478bd9Sstevel@tonic-gate #include <sys/reboot.h> 807c478bd9Sstevel@tonic-gate #include <sys/debug.h> 817c478bd9Sstevel@tonic-gate #include <sys/debugreg.h> 827c478bd9Sstevel@tonic-gate #include <sys/modctl.h> 837c478bd9Sstevel@tonic-gate #include <sys/aio_impl.h> 847c478bd9Sstevel@tonic-gate #include <sys/tnf.h> 857c478bd9Sstevel@tonic-gate #include <sys/tnf_probe.h> 867c478bd9Sstevel@tonic-gate #include <sys/cred.h> 877c478bd9Sstevel@tonic-gate #include <sys/mman.h> 887c478bd9Sstevel@tonic-gate #include <sys/x86_archext.h> 897c478bd9Sstevel@tonic-gate #include <sys/copyops.h> 907c478bd9Sstevel@tonic-gate #include <c2/audit.h> 917c478bd9Sstevel@tonic-gate #include <sys/ftrace.h> 927c478bd9Sstevel@tonic-gate #include <sys/panic.h> 937c478bd9Sstevel@tonic-gate #include <sys/traptrace.h> 947c478bd9Sstevel@tonic-gate #include <sys/ontrap.h> 957c478bd9Sstevel@tonic-gate #include <sys/cpc_impl.h> 96ae115bc7Smrj #include <sys/bootconf.h> 97ae115bc7Smrj #include <sys/bootinfo.h> 98ae115bc7Smrj #include <sys/promif.h> 99ae115bc7Smrj #include <sys/mach_mmu.h> 100843e1988Sjohnlev #if defined(__xpv) 101843e1988Sjohnlev #include <sys/hypervisor.h> 102843e1988Sjohnlev #endif 10320c794b3Sgavinm #include <sys/contract/process_impl.h> 1047c478bd9Sstevel@tonic-gate 1057c478bd9Sstevel@tonic-gate #define USER 0x10000 /* user-mode flag added to trap type */ 1067c478bd9Sstevel@tonic-gate 1077c478bd9Sstevel@tonic-gate static const char *trap_type_mnemonic[] = { 1087c478bd9Sstevel@tonic-gate "de", "db", "2", "bp", 1097c478bd9Sstevel@tonic-gate "of", "br", "ud", "nm", 1107c478bd9Sstevel@tonic-gate "df", "9", "ts", "np", 1117c478bd9Sstevel@tonic-gate "ss", "gp", "pf", "15", 1127c478bd9Sstevel@tonic-gate "mf", "ac", "mc", "xf" 1137c478bd9Sstevel@tonic-gate }; 1147c478bd9Sstevel@tonic-gate 1157c478bd9Sstevel@tonic-gate static const char *trap_type[] = { 1167c478bd9Sstevel@tonic-gate "Divide error", /* trap id 0 */ 1177c478bd9Sstevel@tonic-gate "Debug", /* trap id 1 */ 1187c478bd9Sstevel@tonic-gate "NMI interrupt", /* trap id 2 */ 1197c478bd9Sstevel@tonic-gate "Breakpoint", /* trap id 3 */ 1207c478bd9Sstevel@tonic-gate "Overflow", /* trap id 4 */ 1217c478bd9Sstevel@tonic-gate "BOUND range exceeded", /* trap id 5 */ 1227c478bd9Sstevel@tonic-gate "Invalid opcode", /* trap id 6 */ 1237c478bd9Sstevel@tonic-gate "Device not available", /* trap id 7 */ 1247c478bd9Sstevel@tonic-gate "Double fault", /* trap id 8 */ 1257c478bd9Sstevel@tonic-gate "Coprocessor segment overrun", /* trap id 9 */ 1267c478bd9Sstevel@tonic-gate "Invalid TSS", /* trap id 10 */ 1277c478bd9Sstevel@tonic-gate "Segment not present", /* trap id 11 */ 1287c478bd9Sstevel@tonic-gate "Stack segment fault", /* trap id 12 */ 1297c478bd9Sstevel@tonic-gate "General protection", /* trap id 13 */ 1307c478bd9Sstevel@tonic-gate "Page fault", /* trap id 14 */ 1317c478bd9Sstevel@tonic-gate "Reserved", /* trap id 15 */ 1327c478bd9Sstevel@tonic-gate "x87 floating point error", /* trap id 16 */ 1337c478bd9Sstevel@tonic-gate "Alignment check", /* trap id 17 */ 1347c478bd9Sstevel@tonic-gate "Machine check", /* trap id 18 */ 1357c478bd9Sstevel@tonic-gate "SIMD floating point exception", /* trap id 19 */ 1367c478bd9Sstevel@tonic-gate }; 1377c478bd9Sstevel@tonic-gate 1387c478bd9Sstevel@tonic-gate #define TRAP_TYPES (sizeof (trap_type) / sizeof (trap_type[0])) 1397c478bd9Sstevel@tonic-gate 140ddece0baSsethg #define SLOW_SCALL_SIZE 2 141ddece0baSsethg #define FAST_SCALL_SIZE 2 142ddece0baSsethg 1437c478bd9Sstevel@tonic-gate int tudebug = 0; 1447c478bd9Sstevel@tonic-gate int tudebugbpt = 0; 1457c478bd9Sstevel@tonic-gate int tudebugfpe = 0; 1467c478bd9Sstevel@tonic-gate int tudebugsse = 0; 1477c478bd9Sstevel@tonic-gate 1487c478bd9Sstevel@tonic-gate #if defined(TRAPDEBUG) || defined(lint) 1497c478bd9Sstevel@tonic-gate int tdebug = 0; 1507c478bd9Sstevel@tonic-gate int lodebug = 0; 1517c478bd9Sstevel@tonic-gate int faultdebug = 0; 1527c478bd9Sstevel@tonic-gate #else 1537c478bd9Sstevel@tonic-gate #define tdebug 0 1547c478bd9Sstevel@tonic-gate #define lodebug 0 1557c478bd9Sstevel@tonic-gate #define faultdebug 0 1567c478bd9Sstevel@tonic-gate #endif /* defined(TRAPDEBUG) || defined(lint) */ 1577c478bd9Sstevel@tonic-gate 1587c478bd9Sstevel@tonic-gate #if defined(TRAPTRACE) 159a563a037Sbholler /* 160a563a037Sbholler * trap trace record for cpu0 is allocated here. 161a563a037Sbholler * trap trace records for non-boot cpus are allocated in mp_startup_init(). 162a563a037Sbholler */ 163a563a037Sbholler static trap_trace_rec_t trap_tr0[TRAPTR_NENT]; 164a563a037Sbholler trap_trace_ctl_t trap_trace_ctl[NCPU] = { 165a563a037Sbholler { 166a563a037Sbholler (uintptr_t)trap_tr0, /* next record */ 167a563a037Sbholler (uintptr_t)trap_tr0, /* first record */ 168a563a037Sbholler (uintptr_t)(trap_tr0 + TRAPTR_NENT), /* limit */ 169a563a037Sbholler (uintptr_t)0 /* current */ 170a563a037Sbholler }, 171a563a037Sbholler }; 172a563a037Sbholler 173a563a037Sbholler /* 174a563a037Sbholler * default trap buffer size 175a563a037Sbholler */ 176a563a037Sbholler size_t trap_trace_bufsize = TRAPTR_NENT * sizeof (trap_trace_rec_t); 177a563a037Sbholler int trap_trace_freeze = 0; 178a563a037Sbholler int trap_trace_off = 0; 179a563a037Sbholler 180a563a037Sbholler /* 181a563a037Sbholler * A dummy TRAPTRACE entry to use after death. 182a563a037Sbholler */ 183a563a037Sbholler trap_trace_rec_t trap_trace_postmort; 184a563a037Sbholler 1857c478bd9Sstevel@tonic-gate static void dump_ttrace(void); 1867c478bd9Sstevel@tonic-gate #endif /* TRAPTRACE */ 1877c478bd9Sstevel@tonic-gate static void dumpregs(struct regs *); 1887c478bd9Sstevel@tonic-gate static void showregs(uint_t, struct regs *, caddr_t); 1897c478bd9Sstevel@tonic-gate static int kern_gpfault(struct regs *); 1907c478bd9Sstevel@tonic-gate 1917c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 1927c478bd9Sstevel@tonic-gate static int 1937c478bd9Sstevel@tonic-gate die(uint_t type, struct regs *rp, caddr_t addr, processorid_t cpuid) 1947c478bd9Sstevel@tonic-gate { 195843e1988Sjohnlev struct panic_trap_info ti; 1967c478bd9Sstevel@tonic-gate const char *trap_name, *trap_mnemonic; 1977c478bd9Sstevel@tonic-gate 1987c478bd9Sstevel@tonic-gate if (type < TRAP_TYPES) { 1997c478bd9Sstevel@tonic-gate trap_name = trap_type[type]; 2007c478bd9Sstevel@tonic-gate trap_mnemonic = trap_type_mnemonic[type]; 2017c478bd9Sstevel@tonic-gate } else { 2027c478bd9Sstevel@tonic-gate trap_name = "trap"; 2037c478bd9Sstevel@tonic-gate trap_mnemonic = "-"; 2047c478bd9Sstevel@tonic-gate } 2057c478bd9Sstevel@tonic-gate 2067c478bd9Sstevel@tonic-gate #ifdef TRAPTRACE 2077c478bd9Sstevel@tonic-gate TRAPTRACE_FREEZE; 2087c478bd9Sstevel@tonic-gate #endif 2097c478bd9Sstevel@tonic-gate 2107c478bd9Sstevel@tonic-gate ti.trap_regs = rp; 2117c478bd9Sstevel@tonic-gate ti.trap_type = type & ~USER; 2127c478bd9Sstevel@tonic-gate ti.trap_addr = addr; 2137c478bd9Sstevel@tonic-gate 2147c478bd9Sstevel@tonic-gate curthread->t_panic_trap = &ti; 2157c478bd9Sstevel@tonic-gate 2167c478bd9Sstevel@tonic-gate if (type == T_PGFLT && addr < (caddr_t)KERNELBASE) { 2177c478bd9Sstevel@tonic-gate panic("BAD TRAP: type=%x (#%s %s) rp=%p addr=%p " 2187c478bd9Sstevel@tonic-gate "occurred in module \"%s\" due to %s", 2197c478bd9Sstevel@tonic-gate type, trap_mnemonic, trap_name, (void *)rp, (void *)addr, 2207c478bd9Sstevel@tonic-gate mod_containing_pc((caddr_t)rp->r_pc), 2217c478bd9Sstevel@tonic-gate addr < (caddr_t)PAGESIZE ? 2227c478bd9Sstevel@tonic-gate "a NULL pointer dereference" : 2237c478bd9Sstevel@tonic-gate "an illegal access to a user address"); 2247c478bd9Sstevel@tonic-gate } else 2257c478bd9Sstevel@tonic-gate panic("BAD TRAP: type=%x (#%s %s) rp=%p addr=%p", 2267c478bd9Sstevel@tonic-gate type, trap_mnemonic, trap_name, (void *)rp, (void *)addr); 2277c478bd9Sstevel@tonic-gate return (0); 2287c478bd9Sstevel@tonic-gate } 2297c478bd9Sstevel@tonic-gate 2307c478bd9Sstevel@tonic-gate /* 2317c478bd9Sstevel@tonic-gate * Rewrite the instruction at pc to be an int $T_SYSCALLINT instruction. 2327c478bd9Sstevel@tonic-gate * 2337c478bd9Sstevel@tonic-gate * int <vector> is two bytes: 0xCD <vector> 2347c478bd9Sstevel@tonic-gate */ 2357c478bd9Sstevel@tonic-gate 2367c478bd9Sstevel@tonic-gate static int 2377c478bd9Sstevel@tonic-gate rewrite_syscall(caddr_t pc) 2387c478bd9Sstevel@tonic-gate { 2397c478bd9Sstevel@tonic-gate uchar_t instr[SLOW_SCALL_SIZE] = { 0xCD, T_SYSCALLINT }; 2407c478bd9Sstevel@tonic-gate 2417c478bd9Sstevel@tonic-gate if (uwrite(curthread->t_procp, instr, SLOW_SCALL_SIZE, 2427c478bd9Sstevel@tonic-gate (uintptr_t)pc) != 0) 2437c478bd9Sstevel@tonic-gate return (1); 2447c478bd9Sstevel@tonic-gate 2457c478bd9Sstevel@tonic-gate return (0); 2467c478bd9Sstevel@tonic-gate } 2477c478bd9Sstevel@tonic-gate 2487c478bd9Sstevel@tonic-gate /* 2497c478bd9Sstevel@tonic-gate * Test to see if the instruction at pc is sysenter or syscall. The second 2507c478bd9Sstevel@tonic-gate * argument should be the x86 feature flag corresponding to the expected 2517c478bd9Sstevel@tonic-gate * instruction. 2527c478bd9Sstevel@tonic-gate * 2537c478bd9Sstevel@tonic-gate * sysenter is two bytes: 0x0F 0x34 2547c478bd9Sstevel@tonic-gate * syscall is two bytes: 0x0F 0x05 255ddece0baSsethg * int $T_SYSCALLINT is two bytes: 0xCD 0x91 2567c478bd9Sstevel@tonic-gate */ 2577c478bd9Sstevel@tonic-gate 2587c478bd9Sstevel@tonic-gate static int 259ddece0baSsethg instr_is_other_syscall(caddr_t pc, int which) 2607c478bd9Sstevel@tonic-gate { 2617c478bd9Sstevel@tonic-gate uchar_t instr[FAST_SCALL_SIZE]; 2627c478bd9Sstevel@tonic-gate 2637417cfdeSKuriakose Kuruvilla ASSERT(which == X86FSET_SEP || which == X86FSET_ASYSC || which == 0xCD); 2647c478bd9Sstevel@tonic-gate 265ddece0baSsethg if (copyin_nowatch(pc, (caddr_t)instr, FAST_SCALL_SIZE) != 0) 2667c478bd9Sstevel@tonic-gate return (0); 2677c478bd9Sstevel@tonic-gate 268ddece0baSsethg switch (which) { 2697417cfdeSKuriakose Kuruvilla case X86FSET_SEP: 270ddece0baSsethg if (instr[0] == 0x0F && instr[1] == 0x34) 2717c478bd9Sstevel@tonic-gate return (1); 272ddece0baSsethg break; 2737417cfdeSKuriakose Kuruvilla case X86FSET_ASYSC: 274ddece0baSsethg if (instr[0] == 0x0F && instr[1] == 0x05) 275ddece0baSsethg return (1); 276ddece0baSsethg break; 277ddece0baSsethg case 0xCD: 278ddece0baSsethg if (instr[0] == 0xCD && instr[1] == T_SYSCALLINT) 279ddece0baSsethg return (1); 280ddece0baSsethg break; 281ddece0baSsethg } 2827c478bd9Sstevel@tonic-gate 2837c478bd9Sstevel@tonic-gate return (0); 2847c478bd9Sstevel@tonic-gate } 2857c478bd9Sstevel@tonic-gate 286ddece0baSsethg static const char * 287ddece0baSsethg syscall_insn_string(int syscall_insn) 288ddece0baSsethg { 289ddece0baSsethg switch (syscall_insn) { 2907417cfdeSKuriakose Kuruvilla case X86FSET_SEP: 291ddece0baSsethg return ("sysenter"); 2927417cfdeSKuriakose Kuruvilla case X86FSET_ASYSC: 293ddece0baSsethg return ("syscall"); 294ddece0baSsethg case 0xCD: 295ddece0baSsethg return ("int"); 296ddece0baSsethg default: 297ddece0baSsethg return ("Unknown"); 298ddece0baSsethg } 299ddece0baSsethg } 300ddece0baSsethg 301ddece0baSsethg static int 302ddece0baSsethg ldt_rewrite_syscall(struct regs *rp, proc_t *p, int syscall_insn) 303ddece0baSsethg { 304ddece0baSsethg caddr_t linearpc; 305ddece0baSsethg int return_code = 0; 306ddece0baSsethg 307ddece0baSsethg mutex_enter(&p->p_ldtlock); /* Must be held across linear_pc() */ 308ddece0baSsethg 309ddece0baSsethg if (linear_pc(rp, p, &linearpc) == 0) { 310ddece0baSsethg 311ddece0baSsethg /* 312ddece0baSsethg * If another thread beat us here, it already changed 313ddece0baSsethg * this site to the slower (int) syscall instruction. 314ddece0baSsethg */ 315ddece0baSsethg if (instr_is_other_syscall(linearpc, 0xCD)) { 316ddece0baSsethg return_code = 1; 317ddece0baSsethg } else if (instr_is_other_syscall(linearpc, syscall_insn)) { 318ddece0baSsethg 319ddece0baSsethg if (rewrite_syscall(linearpc) == 0) { 320ddece0baSsethg return_code = 1; 321ddece0baSsethg } 322ddece0baSsethg #ifdef DEBUG 323ddece0baSsethg else 324ddece0baSsethg cmn_err(CE_WARN, "failed to rewrite %s " 325ddece0baSsethg "instruction in process %d", 326ddece0baSsethg syscall_insn_string(syscall_insn), 327ddece0baSsethg p->p_pid); 328ddece0baSsethg #endif /* DEBUG */ 329ddece0baSsethg } 330ddece0baSsethg } 331ddece0baSsethg 332ddece0baSsethg mutex_exit(&p->p_ldtlock); /* Must be held across linear_pc() */ 333ddece0baSsethg 334ddece0baSsethg return (return_code); 335ddece0baSsethg } 336ddece0baSsethg 3377c478bd9Sstevel@tonic-gate /* 3387c478bd9Sstevel@tonic-gate * Test to see if the instruction at pc is a system call instruction. 3397c478bd9Sstevel@tonic-gate * 3407c478bd9Sstevel@tonic-gate * The bytes of an lcall instruction used for the syscall trap. 3417c478bd9Sstevel@tonic-gate * static uchar_t lcall[7] = { 0x9a, 0, 0, 0, 0, 0x7, 0 }; 3427c478bd9Sstevel@tonic-gate * static uchar_t lcallalt[7] = { 0x9a, 0, 0, 0, 0, 0x27, 0 }; 3437c478bd9Sstevel@tonic-gate */ 3447c478bd9Sstevel@tonic-gate 3457c478bd9Sstevel@tonic-gate #define LCALLSIZE 7 3467c478bd9Sstevel@tonic-gate 3477c478bd9Sstevel@tonic-gate static int 348ddece0baSsethg instr_is_lcall_syscall(caddr_t pc) 3497c478bd9Sstevel@tonic-gate { 3507c478bd9Sstevel@tonic-gate uchar_t instr[LCALLSIZE]; 3517c478bd9Sstevel@tonic-gate 3527c478bd9Sstevel@tonic-gate if (copyin_nowatch(pc, (caddr_t)instr, LCALLSIZE) == 0 && 3537c478bd9Sstevel@tonic-gate instr[0] == 0x9a && 3547c478bd9Sstevel@tonic-gate instr[1] == 0 && 3557c478bd9Sstevel@tonic-gate instr[2] == 0 && 3567c478bd9Sstevel@tonic-gate instr[3] == 0 && 3577c478bd9Sstevel@tonic-gate instr[4] == 0 && 3587c478bd9Sstevel@tonic-gate (instr[5] == 0x7 || instr[5] == 0x27) && 3597c478bd9Sstevel@tonic-gate instr[6] == 0) 3607c478bd9Sstevel@tonic-gate return (1); 3617c478bd9Sstevel@tonic-gate 3627c478bd9Sstevel@tonic-gate return (0); 3637c478bd9Sstevel@tonic-gate } 3647c478bd9Sstevel@tonic-gate 365130a12b8Sfvdl #ifdef __amd64 366130a12b8Sfvdl 367130a12b8Sfvdl /* 368ae115bc7Smrj * In the first revisions of amd64 CPUs produced by AMD, the LAHF and 369ae115bc7Smrj * SAHF instructions were not implemented in 64-bit mode. Later revisions 370130a12b8Sfvdl * did implement these instructions. An extension to the cpuid instruction 371130a12b8Sfvdl * was added to check for the capability of executing these instructions 372ae115bc7Smrj * in 64-bit mode. 373130a12b8Sfvdl * 374130a12b8Sfvdl * Intel originally did not implement these instructions in EM64T either, 375130a12b8Sfvdl * but added them in later revisions. 376130a12b8Sfvdl * 377130a12b8Sfvdl * So, there are different chip revisions by both vendors out there that 378130a12b8Sfvdl * may or may not implement these instructions. The easy solution is to 379130a12b8Sfvdl * just always emulate these instructions on demand. 380130a12b8Sfvdl * 381130a12b8Sfvdl * SAHF == store %ah in the lower 8 bits of %rflags (opcode 0x9e) 382130a12b8Sfvdl * LAHF == load the lower 8 bits of %rflags into %ah (opcode 0x9f) 383130a12b8Sfvdl */ 384130a12b8Sfvdl 385130a12b8Sfvdl #define LSAHFSIZE 1 386130a12b8Sfvdl 387130a12b8Sfvdl static int 388130a12b8Sfvdl instr_is_lsahf(caddr_t pc, uchar_t *instr) 389130a12b8Sfvdl { 390130a12b8Sfvdl if (copyin_nowatch(pc, (caddr_t)instr, LSAHFSIZE) == 0 && 391130a12b8Sfvdl (*instr == 0x9e || *instr == 0x9f)) 392130a12b8Sfvdl return (1); 393130a12b8Sfvdl return (0); 394130a12b8Sfvdl } 395130a12b8Sfvdl 396130a12b8Sfvdl /* 397130a12b8Sfvdl * Emulate the LAHF and SAHF instructions. The reference manuals define 398130a12b8Sfvdl * these instructions to always load/store bit 1 as a 1, and bits 3 and 5 399130a12b8Sfvdl * as a 0. The other, defined, bits are copied (the PS_ICC bits and PS_P). 400130a12b8Sfvdl * 401130a12b8Sfvdl * Note that %ah is bits 8-15 of %rax. 402130a12b8Sfvdl */ 403130a12b8Sfvdl static void 404130a12b8Sfvdl emulate_lsahf(struct regs *rp, uchar_t instr) 405130a12b8Sfvdl { 406130a12b8Sfvdl if (instr == 0x9e) { 407130a12b8Sfvdl /* sahf. Copy bits from %ah to flags. */ 408130a12b8Sfvdl rp->r_ps = (rp->r_ps & ~0xff) | 409130a12b8Sfvdl ((rp->r_rax >> 8) & PSL_LSAHFMASK) | PS_MB1; 410130a12b8Sfvdl } else { 411130a12b8Sfvdl /* lahf. Copy bits from flags to %ah. */ 412130a12b8Sfvdl rp->r_rax = (rp->r_rax & ~0xff00) | 413130a12b8Sfvdl (((rp->r_ps & PSL_LSAHFMASK) | PS_MB1) << 8); 414130a12b8Sfvdl } 415130a12b8Sfvdl rp->r_pc += LSAHFSIZE; 416130a12b8Sfvdl } 417130a12b8Sfvdl #endif /* __amd64 */ 418130a12b8Sfvdl 4197c478bd9Sstevel@tonic-gate #ifdef OPTERON_ERRATUM_91 4207c478bd9Sstevel@tonic-gate 4217c478bd9Sstevel@tonic-gate /* 4227c478bd9Sstevel@tonic-gate * Test to see if the instruction at pc is a prefetch instruction. 4237c478bd9Sstevel@tonic-gate * 4247c478bd9Sstevel@tonic-gate * The first byte of prefetch instructions is always 0x0F. 4257c478bd9Sstevel@tonic-gate * The second byte is 0x18 for regular prefetch or 0x0D for AMD 3dnow prefetch. 426d32b5733SGeorge Wilson * The third byte (ModRM) contains the register field bits (bits 3-5). 427d32b5733SGeorge Wilson * These bits must be between 0 and 3 inclusive for regular prefetch and 428d32b5733SGeorge Wilson * 0 and 1 inclusive for AMD 3dnow prefetch. 4298ad4d6ddSJeff Bonwick * 4308ad4d6ddSJeff Bonwick * In 64-bit mode, there may be a one-byte REX prefex (0x40-0x4F). 4317c478bd9Sstevel@tonic-gate */ 4327c478bd9Sstevel@tonic-gate 4337c478bd9Sstevel@tonic-gate static int 4347c478bd9Sstevel@tonic-gate cmp_to_prefetch(uchar_t *p) 4357c478bd9Sstevel@tonic-gate { 4368ad4d6ddSJeff Bonwick #ifdef _LP64 4378ad4d6ddSJeff Bonwick if ((p[0] & 0xF0) == 0x40) /* 64-bit REX prefix */ 4388ad4d6ddSJeff Bonwick p++; 4398ad4d6ddSJeff Bonwick #endif 440d32b5733SGeorge Wilson return ((p[0] == 0x0F && p[1] == 0x18 && ((p[2] >> 3) & 7) <= 3) || 441d32b5733SGeorge Wilson (p[0] == 0x0F && p[1] == 0x0D && ((p[2] >> 3) & 7) <= 1)); 4427c478bd9Sstevel@tonic-gate } 4437c478bd9Sstevel@tonic-gate 4447c478bd9Sstevel@tonic-gate static int 4457c478bd9Sstevel@tonic-gate instr_is_prefetch(caddr_t pc) 4467c478bd9Sstevel@tonic-gate { 4478ad4d6ddSJeff Bonwick uchar_t instr[4]; /* optional REX prefix plus 3-byte opcode */ 4487c478bd9Sstevel@tonic-gate 4498ad4d6ddSJeff Bonwick return (copyin_nowatch(pc, instr, sizeof (instr)) == 0 && 4508ad4d6ddSJeff Bonwick cmp_to_prefetch(instr)); 4517c478bd9Sstevel@tonic-gate } 4527c478bd9Sstevel@tonic-gate 4537c478bd9Sstevel@tonic-gate #endif /* OPTERON_ERRATUM_91 */ 4547c478bd9Sstevel@tonic-gate 4557c478bd9Sstevel@tonic-gate /* 4567c478bd9Sstevel@tonic-gate * Called from the trap handler when a processor trap occurs. 4577c478bd9Sstevel@tonic-gate * 4587c478bd9Sstevel@tonic-gate * Note: All user-level traps that might call stop() must exit 4597c478bd9Sstevel@tonic-gate * trap() by 'goto out' or by falling through. 460ae115bc7Smrj * Note Also: trap() is usually called with interrupts enabled, (PS_IE == 1) 461ae115bc7Smrj * however, there are paths that arrive here with PS_IE == 0 so special care 462ae115bc7Smrj * must be taken in those cases. 4637c478bd9Sstevel@tonic-gate */ 4647c478bd9Sstevel@tonic-gate void 4657c478bd9Sstevel@tonic-gate trap(struct regs *rp, caddr_t addr, processorid_t cpuid) 4667c478bd9Sstevel@tonic-gate { 467ae115bc7Smrj kthread_t *ct = curthread; 4687c478bd9Sstevel@tonic-gate enum seg_rw rw; 4697c478bd9Sstevel@tonic-gate unsigned type; 470ae115bc7Smrj proc_t *p = ttoproc(ct); 471ae115bc7Smrj klwp_t *lwp = ttolwp(ct); 4727c478bd9Sstevel@tonic-gate uintptr_t lofault; 47369c92249SBryan Cantrill label_t *onfault; 4747c478bd9Sstevel@tonic-gate faultcode_t pagefault(), res, errcode; 4757c478bd9Sstevel@tonic-gate enum fault_type fault_type; 4767c478bd9Sstevel@tonic-gate k_siginfo_t siginfo; 4777c478bd9Sstevel@tonic-gate uint_t fault = 0; 4787c478bd9Sstevel@tonic-gate int mstate; 4797c478bd9Sstevel@tonic-gate int sicode = 0; 4807c478bd9Sstevel@tonic-gate int watchcode; 4817c478bd9Sstevel@tonic-gate int watchpage; 4827c478bd9Sstevel@tonic-gate caddr_t vaddr; 4839acbbeafSnn35248 int singlestep_twiddle; 4847c478bd9Sstevel@tonic-gate size_t sz; 4857c478bd9Sstevel@tonic-gate int ta; 486130a12b8Sfvdl #ifdef __amd64 487130a12b8Sfvdl uchar_t instr; 488130a12b8Sfvdl #endif 4897c478bd9Sstevel@tonic-gate 4907c478bd9Sstevel@tonic-gate ASSERT_STACK_ALIGNED(); 4917c478bd9Sstevel@tonic-gate 4927c478bd9Sstevel@tonic-gate type = rp->r_trapno; 4937c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(CPU, sys, trap, 1); 494ae115bc7Smrj ASSERT(ct->t_schedflag & TS_DONT_SWAP); 4957c478bd9Sstevel@tonic-gate 4967c478bd9Sstevel@tonic-gate if (type == T_PGFLT) { 4977c478bd9Sstevel@tonic-gate 4987c478bd9Sstevel@tonic-gate errcode = rp->r_err; 4997c478bd9Sstevel@tonic-gate if (errcode & PF_ERR_WRITE) 5007c478bd9Sstevel@tonic-gate rw = S_WRITE; 5017c478bd9Sstevel@tonic-gate else if ((caddr_t)rp->r_pc == addr || 5027c478bd9Sstevel@tonic-gate (mmu.pt_nx != 0 && (errcode & PF_ERR_EXEC))) 5037c478bd9Sstevel@tonic-gate rw = S_EXEC; 5047c478bd9Sstevel@tonic-gate else 5057c478bd9Sstevel@tonic-gate rw = S_READ; 5067c478bd9Sstevel@tonic-gate 5077c478bd9Sstevel@tonic-gate #if defined(__i386) 5087c478bd9Sstevel@tonic-gate /* 5097c478bd9Sstevel@tonic-gate * Pentium Pro work-around 5107c478bd9Sstevel@tonic-gate */ 5117c478bd9Sstevel@tonic-gate if ((errcode & PF_ERR_PROT) && pentiumpro_bug4046376) { 5127c478bd9Sstevel@tonic-gate uint_t attr; 5137c478bd9Sstevel@tonic-gate uint_t priv_violation; 5147c478bd9Sstevel@tonic-gate uint_t access_violation; 5157c478bd9Sstevel@tonic-gate 5167c478bd9Sstevel@tonic-gate if (hat_getattr(addr < (caddr_t)kernelbase ? 5177c478bd9Sstevel@tonic-gate curproc->p_as->a_hat : kas.a_hat, addr, &attr) 5187c478bd9Sstevel@tonic-gate == -1) { 5197c478bd9Sstevel@tonic-gate errcode &= ~PF_ERR_PROT; 5207c478bd9Sstevel@tonic-gate } else { 5217c478bd9Sstevel@tonic-gate priv_violation = (errcode & PF_ERR_USER) && 5227c478bd9Sstevel@tonic-gate !(attr & PROT_USER); 5237c478bd9Sstevel@tonic-gate access_violation = (errcode & PF_ERR_WRITE) && 5247c478bd9Sstevel@tonic-gate !(attr & PROT_WRITE); 5257c478bd9Sstevel@tonic-gate if (!priv_violation && !access_violation) 5267c478bd9Sstevel@tonic-gate goto cleanup; 5277c478bd9Sstevel@tonic-gate } 5287c478bd9Sstevel@tonic-gate } 5297c478bd9Sstevel@tonic-gate #endif /* __i386 */ 5307c478bd9Sstevel@tonic-gate 531ae115bc7Smrj } else if (type == T_SGLSTP && lwp != NULL) 532ae115bc7Smrj lwp->lwp_pcb.pcb_drstat = (uintptr_t)addr; 5337c478bd9Sstevel@tonic-gate 5347c478bd9Sstevel@tonic-gate if (tdebug) 5357c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 5367c478bd9Sstevel@tonic-gate 5377c478bd9Sstevel@tonic-gate if (USERMODE(rp->r_cs)) { 5387c478bd9Sstevel@tonic-gate /* 5397c478bd9Sstevel@tonic-gate * Set up the current cred to use during this trap. u_cred 5407c478bd9Sstevel@tonic-gate * no longer exists. t_cred is used instead. 5417c478bd9Sstevel@tonic-gate * The current process credential applies to the thread for 5427c478bd9Sstevel@tonic-gate * the entire trap. If trapping from the kernel, this 5437c478bd9Sstevel@tonic-gate * should already be set up. 5447c478bd9Sstevel@tonic-gate */ 545ae115bc7Smrj if (ct->t_cred != p->p_cred) { 546ae115bc7Smrj cred_t *oldcred = ct->t_cred; 5477c478bd9Sstevel@tonic-gate /* 5487c478bd9Sstevel@tonic-gate * DTrace accesses t_cred in probe context. t_cred 5497c478bd9Sstevel@tonic-gate * must always be either NULL, or point to a valid, 5507c478bd9Sstevel@tonic-gate * allocated cred structure. 5517c478bd9Sstevel@tonic-gate */ 552ae115bc7Smrj ct->t_cred = crgetcred(); 5537c478bd9Sstevel@tonic-gate crfree(oldcred); 5547c478bd9Sstevel@tonic-gate } 5557c478bd9Sstevel@tonic-gate ASSERT(lwp != NULL); 5567c478bd9Sstevel@tonic-gate type |= USER; 5577c478bd9Sstevel@tonic-gate ASSERT(lwptoregs(lwp) == rp); 5587c478bd9Sstevel@tonic-gate lwp->lwp_state = LWP_SYS; 5597c478bd9Sstevel@tonic-gate 5607c478bd9Sstevel@tonic-gate switch (type) { 5617c478bd9Sstevel@tonic-gate case T_PGFLT + USER: 5627c478bd9Sstevel@tonic-gate if ((caddr_t)rp->r_pc == addr) 5637c478bd9Sstevel@tonic-gate mstate = LMS_TFAULT; 5647c478bd9Sstevel@tonic-gate else 5657c478bd9Sstevel@tonic-gate mstate = LMS_DFAULT; 5667c478bd9Sstevel@tonic-gate break; 5677c478bd9Sstevel@tonic-gate default: 5687c478bd9Sstevel@tonic-gate mstate = LMS_TRAP; 5697c478bd9Sstevel@tonic-gate break; 5707c478bd9Sstevel@tonic-gate } 5717c478bd9Sstevel@tonic-gate /* Kernel probe */ 5727c478bd9Sstevel@tonic-gate TNF_PROBE_1(thread_state, "thread", /* CSTYLED */, 5737c478bd9Sstevel@tonic-gate tnf_microstate, state, mstate); 574ae115bc7Smrj mstate = new_mstate(ct, mstate); 5757c478bd9Sstevel@tonic-gate 5767c478bd9Sstevel@tonic-gate bzero(&siginfo, sizeof (siginfo)); 5777c478bd9Sstevel@tonic-gate } 5787c478bd9Sstevel@tonic-gate 5797c478bd9Sstevel@tonic-gate switch (type) { 5807c478bd9Sstevel@tonic-gate case T_PGFLT + USER: 5817c478bd9Sstevel@tonic-gate case T_SGLSTP: 5827c478bd9Sstevel@tonic-gate case T_SGLSTP + USER: 5837c478bd9Sstevel@tonic-gate case T_BPTFLT + USER: 5847c478bd9Sstevel@tonic-gate break; 5857c478bd9Sstevel@tonic-gate 5867c478bd9Sstevel@tonic-gate default: 5877c478bd9Sstevel@tonic-gate FTRACE_2("trap(): type=0x%lx, regs=0x%lx", 5887c478bd9Sstevel@tonic-gate (ulong_t)type, (ulong_t)rp); 5897c478bd9Sstevel@tonic-gate break; 5907c478bd9Sstevel@tonic-gate } 5917c478bd9Sstevel@tonic-gate 5927c478bd9Sstevel@tonic-gate switch (type) { 593eae0da43Ssethg case T_SIMDFPE: 594eae0da43Ssethg /* Make sure we enable interrupts before die()ing */ 595eae0da43Ssethg sti(); /* The SIMD exception comes in via cmninttrap */ 596eae0da43Ssethg /*FALLTHROUGH*/ 5977c478bd9Sstevel@tonic-gate default: 5987c478bd9Sstevel@tonic-gate if (type & USER) { 5997c478bd9Sstevel@tonic-gate if (tudebug) 6007c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 6017c478bd9Sstevel@tonic-gate printf("trap: Unknown trap type %d in user mode\n", 6027c478bd9Sstevel@tonic-gate type & ~USER); 6037c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGILL; 6047c478bd9Sstevel@tonic-gate siginfo.si_code = ILL_ILLTRP; 6057c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 6067c478bd9Sstevel@tonic-gate siginfo.si_trapno = type & ~USER; 6077c478bd9Sstevel@tonic-gate fault = FLTILL; 6087c478bd9Sstevel@tonic-gate break; 6097c478bd9Sstevel@tonic-gate } else { 6107c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 6117c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 6127c478bd9Sstevel@tonic-gate } 6137c478bd9Sstevel@tonic-gate 6147c478bd9Sstevel@tonic-gate case T_PGFLT: /* system page fault */ 6157c478bd9Sstevel@tonic-gate /* 6167c478bd9Sstevel@tonic-gate * If we're under on_trap() protection (see <sys/ontrap.h>), 61720c794b3Sgavinm * set ot_trap and bounce back to the on_trap() call site 61820c794b3Sgavinm * via the installed trampoline. 6197c478bd9Sstevel@tonic-gate */ 620ae115bc7Smrj if ((ct->t_ontrap != NULL) && 621ae115bc7Smrj (ct->t_ontrap->ot_prot & OT_DATA_ACCESS)) { 622ae115bc7Smrj ct->t_ontrap->ot_trap |= OT_DATA_ACCESS; 62320c794b3Sgavinm rp->r_pc = ct->t_ontrap->ot_trampoline; 62420c794b3Sgavinm goto cleanup; 6257c478bd9Sstevel@tonic-gate } 6267c478bd9Sstevel@tonic-gate 6277c478bd9Sstevel@tonic-gate /* 628799823bbSRobert Mustacchi * If we have an Instruction fault in kernel mode, then that 629799823bbSRobert Mustacchi * means we've tried to execute a user page (SMEP) or both of 630799823bbSRobert Mustacchi * PAE and NXE are enabled. In either case, given that it's a 631799823bbSRobert Mustacchi * kernel fault, we should panic immediately and not try to make 632799823bbSRobert Mustacchi * any more forward progress. This indicates a bug in the 633799823bbSRobert Mustacchi * kernel, which if execution continued, could be exploited to 634799823bbSRobert Mustacchi * wreak havoc on the system. 635799823bbSRobert Mustacchi */ 636799823bbSRobert Mustacchi if (errcode & PF_ERR_EXEC) { 637799823bbSRobert Mustacchi (void) die(type, rp, addr, cpuid); 638799823bbSRobert Mustacchi } 639799823bbSRobert Mustacchi 640799823bbSRobert Mustacchi /* 6413ce2fcdcSRobert Mustacchi * We need to check if SMAP is in play. If SMAP is in play, then 6423ce2fcdcSRobert Mustacchi * any access to a user page will show up as a protection 6433ce2fcdcSRobert Mustacchi * violation. To see if SMAP is enabled we first check if it's a 6443ce2fcdcSRobert Mustacchi * user address and whether we have the feature flag set. If we 6453ce2fcdcSRobert Mustacchi * do and the interrupted registers do not allow for user 6463ce2fcdcSRobert Mustacchi * accesses (PS_ACHK is not enabled), then we need to die 6473ce2fcdcSRobert Mustacchi * immediately. 6483ce2fcdcSRobert Mustacchi */ 6493ce2fcdcSRobert Mustacchi if (addr < (caddr_t)kernelbase && 6503ce2fcdcSRobert Mustacchi is_x86_feature(x86_featureset, X86FSET_SMAP) == B_TRUE && 6513ce2fcdcSRobert Mustacchi (rp->r_ps & PS_ACHK) == 0) { 6523ce2fcdcSRobert Mustacchi (void) die(type, rp, addr, cpuid); 6533ce2fcdcSRobert Mustacchi } 6543ce2fcdcSRobert Mustacchi 6553ce2fcdcSRobert Mustacchi /* 65669c92249SBryan Cantrill * See if we can handle as pagefault. Save lofault and onfault 65769c92249SBryan Cantrill * across this. Here we assume that an address less than 65869c92249SBryan Cantrill * KERNELBASE is a user fault. We can do this as copy.s 65969c92249SBryan Cantrill * routines verify that the starting address is less than 66069c92249SBryan Cantrill * KERNELBASE before starting and because we know that we 66169c92249SBryan Cantrill * always have KERNELBASE mapped as invalid to serve as a 66269c92249SBryan Cantrill * "barrier". 6637c478bd9Sstevel@tonic-gate */ 664ae115bc7Smrj lofault = ct->t_lofault; 66569c92249SBryan Cantrill onfault = ct->t_onfault; 666ae115bc7Smrj ct->t_lofault = 0; 6677c478bd9Sstevel@tonic-gate 668ae115bc7Smrj mstate = new_mstate(ct, LMS_KFAULT); 6697c478bd9Sstevel@tonic-gate 6707c478bd9Sstevel@tonic-gate if (addr < (caddr_t)kernelbase) { 6717c478bd9Sstevel@tonic-gate res = pagefault(addr, 6727c478bd9Sstevel@tonic-gate (errcode & PF_ERR_PROT)? F_PROT: F_INVAL, rw, 0); 6737c478bd9Sstevel@tonic-gate if (res == FC_NOMAP && 6747c478bd9Sstevel@tonic-gate addr < p->p_usrstack && 6757c478bd9Sstevel@tonic-gate grow(addr)) 6767c478bd9Sstevel@tonic-gate res = 0; 6777c478bd9Sstevel@tonic-gate } else { 6787c478bd9Sstevel@tonic-gate res = pagefault(addr, 6797c478bd9Sstevel@tonic-gate (errcode & PF_ERR_PROT)? F_PROT: F_INVAL, rw, 1); 6807c478bd9Sstevel@tonic-gate } 681ae115bc7Smrj (void) new_mstate(ct, mstate); 6827c478bd9Sstevel@tonic-gate 6837c478bd9Sstevel@tonic-gate /* 68469c92249SBryan Cantrill * Restore lofault and onfault. If we resolved the fault, exit. 6857c478bd9Sstevel@tonic-gate * If we didn't and lofault wasn't set, die. 6867c478bd9Sstevel@tonic-gate */ 687ae115bc7Smrj ct->t_lofault = lofault; 68869c92249SBryan Cantrill ct->t_onfault = onfault; 6897c478bd9Sstevel@tonic-gate if (res == 0) 6907c478bd9Sstevel@tonic-gate goto cleanup; 6917c478bd9Sstevel@tonic-gate 6927c478bd9Sstevel@tonic-gate #if defined(OPTERON_ERRATUM_93) && defined(_LP64) 6937c478bd9Sstevel@tonic-gate if (lofault == 0 && opteron_erratum_93) { 6947c478bd9Sstevel@tonic-gate /* 6957c478bd9Sstevel@tonic-gate * Workaround for Opteron Erratum 93. On return from 6967c478bd9Sstevel@tonic-gate * a System Managment Interrupt at a HLT instruction 6977c478bd9Sstevel@tonic-gate * the %rip might be truncated to a 32 bit value. 6987c478bd9Sstevel@tonic-gate * BIOS is supposed to fix this, but some don't. 6997c478bd9Sstevel@tonic-gate * If this occurs we simply restore the high order bits. 7007c478bd9Sstevel@tonic-gate * The HLT instruction is 1 byte of 0xf4. 7017c478bd9Sstevel@tonic-gate */ 7027c478bd9Sstevel@tonic-gate uintptr_t rip = rp->r_pc; 7037c478bd9Sstevel@tonic-gate 7047c478bd9Sstevel@tonic-gate if ((rip & 0xfffffffful) == rip) { 7057c478bd9Sstevel@tonic-gate rip |= 0xfffffffful << 32; 7067c478bd9Sstevel@tonic-gate if (hat_getpfnum(kas.a_hat, (caddr_t)rip) != 7077c478bd9Sstevel@tonic-gate PFN_INVALID && 7087c478bd9Sstevel@tonic-gate (*(uchar_t *)rip == 0xf4 || 7097c478bd9Sstevel@tonic-gate *(uchar_t *)(rip - 1) == 0xf4)) { 7107c478bd9Sstevel@tonic-gate rp->r_pc = rip; 7117c478bd9Sstevel@tonic-gate goto cleanup; 7127c478bd9Sstevel@tonic-gate } 7137c478bd9Sstevel@tonic-gate } 7147c478bd9Sstevel@tonic-gate } 7157c478bd9Sstevel@tonic-gate #endif /* OPTERON_ERRATUM_93 && _LP64 */ 7167c478bd9Sstevel@tonic-gate 7177c478bd9Sstevel@tonic-gate #ifdef OPTERON_ERRATUM_91 7187c478bd9Sstevel@tonic-gate if (lofault == 0 && opteron_erratum_91) { 7197c478bd9Sstevel@tonic-gate /* 7207c478bd9Sstevel@tonic-gate * Workaround for Opteron Erratum 91. Prefetches may 7217c478bd9Sstevel@tonic-gate * generate a page fault (they're not supposed to do 7227c478bd9Sstevel@tonic-gate * that!). If this occurs we simply return back to the 7237c478bd9Sstevel@tonic-gate * instruction. 7247c478bd9Sstevel@tonic-gate */ 7257c478bd9Sstevel@tonic-gate caddr_t pc = (caddr_t)rp->r_pc; 7267c478bd9Sstevel@tonic-gate 7277c478bd9Sstevel@tonic-gate /* 7287c478bd9Sstevel@tonic-gate * If the faulting PC is not mapped, this is a 7297c478bd9Sstevel@tonic-gate * legitimate kernel page fault that must result in a 7307c478bd9Sstevel@tonic-gate * panic. If the faulting PC is mapped, it could contain 7317c478bd9Sstevel@tonic-gate * a prefetch instruction. Check for that here. 7327c478bd9Sstevel@tonic-gate */ 7337c478bd9Sstevel@tonic-gate if (hat_getpfnum(kas.a_hat, pc) != PFN_INVALID) { 7347c478bd9Sstevel@tonic-gate if (cmp_to_prefetch((uchar_t *)pc)) { 7357c478bd9Sstevel@tonic-gate #ifdef DEBUG 7367c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "Opteron erratum 91 " 7377c478bd9Sstevel@tonic-gate "occurred: kernel prefetch" 7387c478bd9Sstevel@tonic-gate " at %p generated a page fault!", 7397c478bd9Sstevel@tonic-gate (void *)rp->r_pc); 7407c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 7417c478bd9Sstevel@tonic-gate goto cleanup; 7427c478bd9Sstevel@tonic-gate } 7437c478bd9Sstevel@tonic-gate } 7447c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 7457c478bd9Sstevel@tonic-gate } 7467c478bd9Sstevel@tonic-gate #endif /* OPTERON_ERRATUM_91 */ 7477c478bd9Sstevel@tonic-gate 7487c478bd9Sstevel@tonic-gate if (lofault == 0) 7497c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 7507c478bd9Sstevel@tonic-gate 7517c478bd9Sstevel@tonic-gate /* 7527c478bd9Sstevel@tonic-gate * Cannot resolve fault. Return to lofault. 7537c478bd9Sstevel@tonic-gate */ 7547c478bd9Sstevel@tonic-gate if (lodebug) { 7557c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 7567c478bd9Sstevel@tonic-gate traceregs(rp); 7577c478bd9Sstevel@tonic-gate } 7587c478bd9Sstevel@tonic-gate if (FC_CODE(res) == FC_OBJERR) 7597c478bd9Sstevel@tonic-gate res = FC_ERRNO(res); 7607c478bd9Sstevel@tonic-gate else 7617c478bd9Sstevel@tonic-gate res = EFAULT; 7627c478bd9Sstevel@tonic-gate rp->r_r0 = res; 763ae115bc7Smrj rp->r_pc = ct->t_lofault; 7647c478bd9Sstevel@tonic-gate goto cleanup; 7657c478bd9Sstevel@tonic-gate 7667c478bd9Sstevel@tonic-gate case T_PGFLT + USER: /* user page fault */ 7677c478bd9Sstevel@tonic-gate if (faultdebug) { 7687c478bd9Sstevel@tonic-gate char *fault_str; 7697c478bd9Sstevel@tonic-gate 7707c478bd9Sstevel@tonic-gate switch (rw) { 7717c478bd9Sstevel@tonic-gate case S_READ: 7727c478bd9Sstevel@tonic-gate fault_str = "read"; 7737c478bd9Sstevel@tonic-gate break; 7747c478bd9Sstevel@tonic-gate case S_WRITE: 7757c478bd9Sstevel@tonic-gate fault_str = "write"; 7767c478bd9Sstevel@tonic-gate break; 7777c478bd9Sstevel@tonic-gate case S_EXEC: 7787c478bd9Sstevel@tonic-gate fault_str = "exec"; 7797c478bd9Sstevel@tonic-gate break; 7807c478bd9Sstevel@tonic-gate default: 7817c478bd9Sstevel@tonic-gate fault_str = ""; 7827c478bd9Sstevel@tonic-gate break; 7837c478bd9Sstevel@tonic-gate } 7847c478bd9Sstevel@tonic-gate printf("user %s fault: addr=0x%lx errcode=0x%x\n", 7857c478bd9Sstevel@tonic-gate fault_str, (uintptr_t)addr, errcode); 7867c478bd9Sstevel@tonic-gate } 7877c478bd9Sstevel@tonic-gate 7887c478bd9Sstevel@tonic-gate #if defined(OPTERON_ERRATUM_100) && defined(_LP64) 7897c478bd9Sstevel@tonic-gate /* 7907c478bd9Sstevel@tonic-gate * Workaround for AMD erratum 100 7917c478bd9Sstevel@tonic-gate * 7927c478bd9Sstevel@tonic-gate * A 32-bit process may receive a page fault on a non 7937c478bd9Sstevel@tonic-gate * 32-bit address by mistake. The range of the faulting 7947c478bd9Sstevel@tonic-gate * address will be 7957c478bd9Sstevel@tonic-gate * 7967c478bd9Sstevel@tonic-gate * 0xffffffff80000000 .. 0xffffffffffffffff or 7977c478bd9Sstevel@tonic-gate * 0x0000000100000000 .. 0x000000017fffffff 7987c478bd9Sstevel@tonic-gate * 7997c478bd9Sstevel@tonic-gate * The fault is always due to an instruction fetch, however 8007c478bd9Sstevel@tonic-gate * the value of r_pc should be correct (in 32 bit range), 8017c478bd9Sstevel@tonic-gate * so we ignore the page fault on the bogus address. 8027c478bd9Sstevel@tonic-gate */ 8037c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_ILP32 && 8047c478bd9Sstevel@tonic-gate (0xffffffff80000000 <= (uintptr_t)addr || 8057c478bd9Sstevel@tonic-gate (0x100000000 <= (uintptr_t)addr && 8067c478bd9Sstevel@tonic-gate (uintptr_t)addr <= 0x17fffffff))) { 8077c478bd9Sstevel@tonic-gate if (!opteron_erratum_100) 8087c478bd9Sstevel@tonic-gate panic("unexpected erratum #100"); 8097c478bd9Sstevel@tonic-gate if (rp->r_pc <= 0xffffffff) 8107c478bd9Sstevel@tonic-gate goto out; 8117c478bd9Sstevel@tonic-gate } 8127c478bd9Sstevel@tonic-gate #endif /* OPTERON_ERRATUM_100 && _LP64 */ 8137c478bd9Sstevel@tonic-gate 8147c478bd9Sstevel@tonic-gate ASSERT(!(curthread->t_flag & T_WATCHPT)); 8157c478bd9Sstevel@tonic-gate watchpage = (pr_watch_active(p) && pr_is_watchpage(addr, rw)); 8167c478bd9Sstevel@tonic-gate #ifdef __i386 8177c478bd9Sstevel@tonic-gate /* 8187c478bd9Sstevel@tonic-gate * In 32-bit mode, the lcall (system call) instruction fetches 8197c478bd9Sstevel@tonic-gate * one word from the stack, at the stack pointer, because of the 8207c478bd9Sstevel@tonic-gate * way the call gate is constructed. This is a bogus 8217c478bd9Sstevel@tonic-gate * read and should not be counted as a read watchpoint. 8227c478bd9Sstevel@tonic-gate * We work around the problem here by testing to see if 8237c478bd9Sstevel@tonic-gate * this situation applies and, if so, simply jumping to 8247c478bd9Sstevel@tonic-gate * the code in locore.s that fields the system call trap. 8257c478bd9Sstevel@tonic-gate * The registers on the stack are already set up properly 8267c478bd9Sstevel@tonic-gate * due to the match between the call gate sequence and the 8277c478bd9Sstevel@tonic-gate * trap gate sequence. We just have to adjust the pc. 8287c478bd9Sstevel@tonic-gate */ 8297c478bd9Sstevel@tonic-gate if (watchpage && addr == (caddr_t)rp->r_sp && 830ddece0baSsethg rw == S_READ && instr_is_lcall_syscall((caddr_t)rp->r_pc)) { 8317c478bd9Sstevel@tonic-gate extern void watch_syscall(void); 8327c478bd9Sstevel@tonic-gate 8337c478bd9Sstevel@tonic-gate rp->r_pc += LCALLSIZE; 8347c478bd9Sstevel@tonic-gate watch_syscall(); /* never returns */ 8357c478bd9Sstevel@tonic-gate /* NOTREACHED */ 8367c478bd9Sstevel@tonic-gate } 8377c478bd9Sstevel@tonic-gate #endif /* __i386 */ 8387c478bd9Sstevel@tonic-gate vaddr = addr; 8397c478bd9Sstevel@tonic-gate if (!watchpage || (sz = instr_size(rp, &vaddr, rw)) <= 0) 8407c478bd9Sstevel@tonic-gate fault_type = (errcode & PF_ERR_PROT)? F_PROT: F_INVAL; 8417c478bd9Sstevel@tonic-gate else if ((watchcode = pr_is_watchpoint(&vaddr, &ta, 8427c478bd9Sstevel@tonic-gate sz, NULL, rw)) != 0) { 8437c478bd9Sstevel@tonic-gate if (ta) { 8447c478bd9Sstevel@tonic-gate do_watch_step(vaddr, sz, rw, 8457c478bd9Sstevel@tonic-gate watchcode, rp->r_pc); 8467c478bd9Sstevel@tonic-gate fault_type = F_INVAL; 8477c478bd9Sstevel@tonic-gate } else { 8487c478bd9Sstevel@tonic-gate bzero(&siginfo, sizeof (siginfo)); 8497c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGTRAP; 8507c478bd9Sstevel@tonic-gate siginfo.si_code = watchcode; 8517c478bd9Sstevel@tonic-gate siginfo.si_addr = vaddr; 8527c478bd9Sstevel@tonic-gate siginfo.si_trapafter = 0; 8537c478bd9Sstevel@tonic-gate siginfo.si_pc = (caddr_t)rp->r_pc; 8547c478bd9Sstevel@tonic-gate fault = FLTWATCH; 8557c478bd9Sstevel@tonic-gate break; 8567c478bd9Sstevel@tonic-gate } 8577c478bd9Sstevel@tonic-gate } else { 8587c478bd9Sstevel@tonic-gate /* XXX pr_watch_emul() never succeeds (for now) */ 8597c478bd9Sstevel@tonic-gate if (rw != S_EXEC && pr_watch_emul(rp, vaddr, rw)) 8607c478bd9Sstevel@tonic-gate goto out; 8617c478bd9Sstevel@tonic-gate do_watch_step(vaddr, sz, rw, 0, 0); 8627c478bd9Sstevel@tonic-gate fault_type = F_INVAL; 8637c478bd9Sstevel@tonic-gate } 8647c478bd9Sstevel@tonic-gate 8657c478bd9Sstevel@tonic-gate res = pagefault(addr, fault_type, rw, 0); 8667c478bd9Sstevel@tonic-gate 8677c478bd9Sstevel@tonic-gate /* 8687c478bd9Sstevel@tonic-gate * If pagefault() succeeded, ok. 8697c478bd9Sstevel@tonic-gate * Otherwise attempt to grow the stack. 8707c478bd9Sstevel@tonic-gate */ 8717c478bd9Sstevel@tonic-gate if (res == 0 || 8727c478bd9Sstevel@tonic-gate (res == FC_NOMAP && 8737c478bd9Sstevel@tonic-gate addr < p->p_usrstack && 8747c478bd9Sstevel@tonic-gate grow(addr))) { 8757c478bd9Sstevel@tonic-gate lwp->lwp_lastfault = FLTPAGE; 8767c478bd9Sstevel@tonic-gate lwp->lwp_lastfaddr = addr; 8777c478bd9Sstevel@tonic-gate if (prismember(&p->p_fltmask, FLTPAGE)) { 8787c478bd9Sstevel@tonic-gate bzero(&siginfo, sizeof (siginfo)); 8797c478bd9Sstevel@tonic-gate siginfo.si_addr = addr; 8807c478bd9Sstevel@tonic-gate (void) stop_on_fault(FLTPAGE, &siginfo); 8817c478bd9Sstevel@tonic-gate } 8827c478bd9Sstevel@tonic-gate goto out; 8837c478bd9Sstevel@tonic-gate } else if (res == FC_PROT && addr < p->p_usrstack && 8847c478bd9Sstevel@tonic-gate (mmu.pt_nx != 0 && (errcode & PF_ERR_EXEC))) { 8857c478bd9Sstevel@tonic-gate report_stack_exec(p, addr); 8867c478bd9Sstevel@tonic-gate } 8877c478bd9Sstevel@tonic-gate 8887c478bd9Sstevel@tonic-gate #ifdef OPTERON_ERRATUM_91 8897c478bd9Sstevel@tonic-gate /* 8907c478bd9Sstevel@tonic-gate * Workaround for Opteron Erratum 91. Prefetches may generate a 8917c478bd9Sstevel@tonic-gate * page fault (they're not supposed to do that!). If this 8927c478bd9Sstevel@tonic-gate * occurs we simply return back to the instruction. 8937c478bd9Sstevel@tonic-gate * 8947c478bd9Sstevel@tonic-gate * We rely on copyin to properly fault in the page with r_pc. 8957c478bd9Sstevel@tonic-gate */ 8967c478bd9Sstevel@tonic-gate if (opteron_erratum_91 && 8977c478bd9Sstevel@tonic-gate addr != (caddr_t)rp->r_pc && 8987c478bd9Sstevel@tonic-gate instr_is_prefetch((caddr_t)rp->r_pc)) { 8997c478bd9Sstevel@tonic-gate #ifdef DEBUG 9007c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "Opteron erratum 91 occurred: " 9017c478bd9Sstevel@tonic-gate "prefetch at %p in pid %d generated a trap!", 9027c478bd9Sstevel@tonic-gate (void *)rp->r_pc, p->p_pid); 9037c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 9047c478bd9Sstevel@tonic-gate goto out; 9057c478bd9Sstevel@tonic-gate } 9067c478bd9Sstevel@tonic-gate #endif /* OPTERON_ERRATUM_91 */ 9077c478bd9Sstevel@tonic-gate 9087c478bd9Sstevel@tonic-gate if (tudebug) 9097c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 9107c478bd9Sstevel@tonic-gate /* 9117c478bd9Sstevel@tonic-gate * In the case where both pagefault and grow fail, 9127c478bd9Sstevel@tonic-gate * set the code to the value provided by pagefault. 9137c478bd9Sstevel@tonic-gate * We map all errors returned from pagefault() to SIGSEGV. 9147c478bd9Sstevel@tonic-gate */ 9157c478bd9Sstevel@tonic-gate bzero(&siginfo, sizeof (siginfo)); 9167c478bd9Sstevel@tonic-gate siginfo.si_addr = addr; 9177c478bd9Sstevel@tonic-gate switch (FC_CODE(res)) { 9187c478bd9Sstevel@tonic-gate case FC_HWERR: 9197c478bd9Sstevel@tonic-gate case FC_NOSUPPORT: 9207c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGBUS; 9217c478bd9Sstevel@tonic-gate siginfo.si_code = BUS_ADRERR; 9227c478bd9Sstevel@tonic-gate fault = FLTACCESS; 9237c478bd9Sstevel@tonic-gate break; 9247c478bd9Sstevel@tonic-gate case FC_ALIGN: 9257c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGBUS; 9267c478bd9Sstevel@tonic-gate siginfo.si_code = BUS_ADRALN; 9277c478bd9Sstevel@tonic-gate fault = FLTACCESS; 9287c478bd9Sstevel@tonic-gate break; 9297c478bd9Sstevel@tonic-gate case FC_OBJERR: 9307c478bd9Sstevel@tonic-gate if ((siginfo.si_errno = FC_ERRNO(res)) != EINTR) { 9317c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGBUS; 9327c478bd9Sstevel@tonic-gate siginfo.si_code = BUS_OBJERR; 9337c478bd9Sstevel@tonic-gate fault = FLTACCESS; 9347c478bd9Sstevel@tonic-gate } 9357c478bd9Sstevel@tonic-gate break; 9367c478bd9Sstevel@tonic-gate default: /* FC_NOMAP or FC_PROT */ 9377c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGSEGV; 9387c478bd9Sstevel@tonic-gate siginfo.si_code = 9397c478bd9Sstevel@tonic-gate (res == FC_NOMAP)? SEGV_MAPERR : SEGV_ACCERR; 9407c478bd9Sstevel@tonic-gate fault = FLTBOUNDS; 9417c478bd9Sstevel@tonic-gate break; 9427c478bd9Sstevel@tonic-gate } 9437c478bd9Sstevel@tonic-gate break; 9447c478bd9Sstevel@tonic-gate 9457c478bd9Sstevel@tonic-gate case T_ILLINST + USER: /* invalid opcode fault */ 9467c478bd9Sstevel@tonic-gate /* 9477c478bd9Sstevel@tonic-gate * If the syscall instruction is disabled due to LDT usage, a 9487c478bd9Sstevel@tonic-gate * user program that attempts to execute it will trigger a #ud 9497c478bd9Sstevel@tonic-gate * trap. Check for that case here. If this occurs on a CPU which 9507c478bd9Sstevel@tonic-gate * doesn't even support syscall, the result of all of this will 9517c478bd9Sstevel@tonic-gate * be to emulate that particular instruction. 9527c478bd9Sstevel@tonic-gate */ 9537c478bd9Sstevel@tonic-gate if (p->p_ldt != NULL && 9547417cfdeSKuriakose Kuruvilla ldt_rewrite_syscall(rp, p, X86FSET_ASYSC)) 9557c478bd9Sstevel@tonic-gate goto out; 956130a12b8Sfvdl 957130a12b8Sfvdl #ifdef __amd64 958130a12b8Sfvdl /* 959130a12b8Sfvdl * Emulate the LAHF and SAHF instructions if needed. 960130a12b8Sfvdl * See the instr_is_lsahf function for details. 961130a12b8Sfvdl */ 962130a12b8Sfvdl if (p->p_model == DATAMODEL_LP64 && 963130a12b8Sfvdl instr_is_lsahf((caddr_t)rp->r_pc, &instr)) { 964130a12b8Sfvdl emulate_lsahf(rp, instr); 965130a12b8Sfvdl goto out; 966130a12b8Sfvdl } 967130a12b8Sfvdl #endif 968130a12b8Sfvdl 9697c478bd9Sstevel@tonic-gate /*FALLTHROUGH*/ 9707c478bd9Sstevel@tonic-gate 9717c478bd9Sstevel@tonic-gate if (tudebug) 9727c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 9737c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGILL; 9747c478bd9Sstevel@tonic-gate siginfo.si_code = ILL_ILLOPC; 9757c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 9767c478bd9Sstevel@tonic-gate fault = FLTILL; 9777c478bd9Sstevel@tonic-gate break; 9787c478bd9Sstevel@tonic-gate 9797c478bd9Sstevel@tonic-gate case T_ZERODIV + USER: /* integer divide by zero */ 9807c478bd9Sstevel@tonic-gate if (tudebug && tudebugfpe) 9817c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 9827c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGFPE; 9837c478bd9Sstevel@tonic-gate siginfo.si_code = FPE_INTDIV; 9847c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 9857c478bd9Sstevel@tonic-gate fault = FLTIZDIV; 9867c478bd9Sstevel@tonic-gate break; 9877c478bd9Sstevel@tonic-gate 9887c478bd9Sstevel@tonic-gate case T_OVFLW + USER: /* integer overflow */ 9897c478bd9Sstevel@tonic-gate if (tudebug && tudebugfpe) 9907c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 9917c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGFPE; 9927c478bd9Sstevel@tonic-gate siginfo.si_code = FPE_INTOVF; 9937c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 9947c478bd9Sstevel@tonic-gate fault = FLTIOVF; 9957c478bd9Sstevel@tonic-gate break; 9967c478bd9Sstevel@tonic-gate 9977c478bd9Sstevel@tonic-gate case T_NOEXTFLT + USER: /* math coprocessor not available */ 9987c478bd9Sstevel@tonic-gate if (tudebug && tudebugfpe) 9997c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 10007c478bd9Sstevel@tonic-gate if (fpnoextflt(rp)) { 10016075fa3dSRoger A. Faulkner siginfo.si_signo = SIGILL; 10027c478bd9Sstevel@tonic-gate siginfo.si_code = ILL_ILLOPC; 10037c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 10046075fa3dSRoger A. Faulkner fault = FLTILL; 10057c478bd9Sstevel@tonic-gate } 10067c478bd9Sstevel@tonic-gate break; 10077c478bd9Sstevel@tonic-gate 10087c478bd9Sstevel@tonic-gate case T_EXTOVRFLT: /* extension overrun fault */ 10097c478bd9Sstevel@tonic-gate /* check if we took a kernel trap on behalf of user */ 10107c478bd9Sstevel@tonic-gate { 10117c478bd9Sstevel@tonic-gate extern void ndptrap_frstor(void); 1012eae0da43Ssethg if (rp->r_pc != (uintptr_t)ndptrap_frstor) { 1013eae0da43Ssethg sti(); /* T_EXTOVRFLT comes in via cmninttrap */ 10147c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 1015eae0da43Ssethg } 10167c478bd9Sstevel@tonic-gate type |= USER; 10177c478bd9Sstevel@tonic-gate } 10187c478bd9Sstevel@tonic-gate /*FALLTHROUGH*/ 10197c478bd9Sstevel@tonic-gate case T_EXTOVRFLT + USER: /* extension overrun fault */ 10207c478bd9Sstevel@tonic-gate if (tudebug && tudebugfpe) 10217c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 10227c478bd9Sstevel@tonic-gate if (fpextovrflt(rp)) { 10237c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGSEGV; 10247c478bd9Sstevel@tonic-gate siginfo.si_code = SEGV_MAPERR; 10257c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 10267c478bd9Sstevel@tonic-gate fault = FLTBOUNDS; 10277c478bd9Sstevel@tonic-gate } 10287c478bd9Sstevel@tonic-gate break; 10297c478bd9Sstevel@tonic-gate 10307c478bd9Sstevel@tonic-gate case T_EXTERRFLT: /* x87 floating point exception pending */ 10317c478bd9Sstevel@tonic-gate /* check if we took a kernel trap on behalf of user */ 10327c478bd9Sstevel@tonic-gate { 10337c478bd9Sstevel@tonic-gate extern void ndptrap_frstor(void); 1034eae0da43Ssethg if (rp->r_pc != (uintptr_t)ndptrap_frstor) { 1035eae0da43Ssethg sti(); /* T_EXTERRFLT comes in via cmninttrap */ 10367c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 1037eae0da43Ssethg } 10387c478bd9Sstevel@tonic-gate type |= USER; 10397c478bd9Sstevel@tonic-gate } 10407c478bd9Sstevel@tonic-gate /*FALLTHROUGH*/ 10417c478bd9Sstevel@tonic-gate 10427c478bd9Sstevel@tonic-gate case T_EXTERRFLT + USER: /* x87 floating point exception pending */ 10437c478bd9Sstevel@tonic-gate if (tudebug && tudebugfpe) 10447c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 10457c478bd9Sstevel@tonic-gate if (sicode = fpexterrflt(rp)) { 10467c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGFPE; 10477c478bd9Sstevel@tonic-gate siginfo.si_code = sicode; 10487c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 10497c478bd9Sstevel@tonic-gate fault = FLTFPE; 10507c478bd9Sstevel@tonic-gate } 10517c478bd9Sstevel@tonic-gate break; 10527c478bd9Sstevel@tonic-gate 10537c478bd9Sstevel@tonic-gate case T_SIMDFPE + USER: /* SSE and SSE2 exceptions */ 10547c478bd9Sstevel@tonic-gate if (tudebug && tudebugsse) 10557c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 10567417cfdeSKuriakose Kuruvilla if (!is_x86_feature(x86_featureset, X86FSET_SSE) && 10577417cfdeSKuriakose Kuruvilla !is_x86_feature(x86_featureset, X86FSET_SSE2)) { 10587c478bd9Sstevel@tonic-gate /* 10597c478bd9Sstevel@tonic-gate * There are rumours that some user instructions 10607c478bd9Sstevel@tonic-gate * on older CPUs can cause this trap to occur; in 10617c478bd9Sstevel@tonic-gate * which case send a SIGILL instead of a SIGFPE. 10627c478bd9Sstevel@tonic-gate */ 10637c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGILL; 10647c478bd9Sstevel@tonic-gate siginfo.si_code = ILL_ILLTRP; 10657c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 10667c478bd9Sstevel@tonic-gate siginfo.si_trapno = type & ~USER; 10677c478bd9Sstevel@tonic-gate fault = FLTILL; 10687c478bd9Sstevel@tonic-gate } else if ((sicode = fpsimderrflt(rp)) != 0) { 10697c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGFPE; 10707c478bd9Sstevel@tonic-gate siginfo.si_code = sicode; 10717c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 10727c478bd9Sstevel@tonic-gate fault = FLTFPE; 10737c478bd9Sstevel@tonic-gate } 1074eae0da43Ssethg 1075eae0da43Ssethg sti(); /* The SIMD exception comes in via cmninttrap */ 10767c478bd9Sstevel@tonic-gate break; 10777c478bd9Sstevel@tonic-gate 10787c478bd9Sstevel@tonic-gate case T_BPTFLT: /* breakpoint trap */ 10797c478bd9Sstevel@tonic-gate /* 10807c478bd9Sstevel@tonic-gate * Kernel breakpoint traps should only happen when kmdb is 10817c478bd9Sstevel@tonic-gate * active, and even then, it'll have interposed on the IDT, so 10827c478bd9Sstevel@tonic-gate * control won't get here. If it does, we've hit a breakpoint 10837c478bd9Sstevel@tonic-gate * without the debugger, which is very strange, and very 10847c478bd9Sstevel@tonic-gate * fatal. 10857c478bd9Sstevel@tonic-gate */ 10867c478bd9Sstevel@tonic-gate if (tudebug && tudebugbpt) 10877c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 10887c478bd9Sstevel@tonic-gate 10897c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 10907c478bd9Sstevel@tonic-gate break; 10917c478bd9Sstevel@tonic-gate 10927c478bd9Sstevel@tonic-gate case T_SGLSTP: /* single step/hw breakpoint exception */ 10937c478bd9Sstevel@tonic-gate 10947c478bd9Sstevel@tonic-gate /* Now evaluate how we got here */ 10957c478bd9Sstevel@tonic-gate if (lwp != NULL && (lwp->lwp_pcb.pcb_drstat & DR_SINGLESTEP)) { 10967c478bd9Sstevel@tonic-gate /* 10977c478bd9Sstevel@tonic-gate * i386 single-steps even through lcalls which 10987c478bd9Sstevel@tonic-gate * change the privilege level. So we take a trap at 10997c478bd9Sstevel@tonic-gate * the first instruction in privileged mode. 11007c478bd9Sstevel@tonic-gate * 11017c478bd9Sstevel@tonic-gate * Set a flag to indicate that upon completion of 11027c478bd9Sstevel@tonic-gate * the system call, deal with the single-step trap. 11037c478bd9Sstevel@tonic-gate * 11047c478bd9Sstevel@tonic-gate * The same thing happens for sysenter, too. 11057c478bd9Sstevel@tonic-gate */ 11069acbbeafSnn35248 singlestep_twiddle = 0; 11079acbbeafSnn35248 if (rp->r_pc == (uintptr_t)sys_sysenter || 11089acbbeafSnn35248 rp->r_pc == (uintptr_t)brand_sys_sysenter) { 11099acbbeafSnn35248 singlestep_twiddle = 1; 11107c478bd9Sstevel@tonic-gate #if defined(__amd64) 11117c478bd9Sstevel@tonic-gate /* 11129acbbeafSnn35248 * Since we are already on the kernel's 11139acbbeafSnn35248 * %gs, on 64-bit systems the sysenter case 11149acbbeafSnn35248 * needs to adjust the pc to avoid 11159acbbeafSnn35248 * executing the swapgs instruction at the 11169acbbeafSnn35248 * top of the handler. 11177c478bd9Sstevel@tonic-gate */ 11189acbbeafSnn35248 if (rp->r_pc == (uintptr_t)sys_sysenter) 11197c478bd9Sstevel@tonic-gate rp->r_pc = (uintptr_t) 11207c478bd9Sstevel@tonic-gate _sys_sysenter_post_swapgs; 11219acbbeafSnn35248 else 11229acbbeafSnn35248 rp->r_pc = (uintptr_t) 11239acbbeafSnn35248 _brand_sys_sysenter_post_swapgs; 11247c478bd9Sstevel@tonic-gate #endif 11259acbbeafSnn35248 } 11269acbbeafSnn35248 #if defined(__i386) 11279acbbeafSnn35248 else if (rp->r_pc == (uintptr_t)sys_call || 11289acbbeafSnn35248 rp->r_pc == (uintptr_t)brand_sys_call) { 11299acbbeafSnn35248 singlestep_twiddle = 1; 11309acbbeafSnn35248 } 11319acbbeafSnn35248 #endif 11326db33255Sdmick else { 11336db33255Sdmick /* not on sysenter/syscall; uregs available */ 11346db33255Sdmick if (tudebug && tudebugbpt) 11356db33255Sdmick showregs(type, rp, (caddr_t)0); 11366db33255Sdmick } 11379acbbeafSnn35248 if (singlestep_twiddle) { 11387c478bd9Sstevel@tonic-gate rp->r_ps &= ~PS_T; /* turn off trace */ 11397c478bd9Sstevel@tonic-gate lwp->lwp_pcb.pcb_flags |= DEBUG_PENDING; 1140ae115bc7Smrj ct->t_post_sys = 1; 1141d8aa0f5aSsudheer aston(curthread); 11427c478bd9Sstevel@tonic-gate goto cleanup; 11437c478bd9Sstevel@tonic-gate } 11447c478bd9Sstevel@tonic-gate } 11457c478bd9Sstevel@tonic-gate /* XXX - needs review on debugger interface? */ 11467c478bd9Sstevel@tonic-gate if (boothowto & RB_DEBUG) 11477c478bd9Sstevel@tonic-gate debug_enter((char *)NULL); 11487c478bd9Sstevel@tonic-gate else 11497c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 11507c478bd9Sstevel@tonic-gate break; 11517c478bd9Sstevel@tonic-gate 11527c478bd9Sstevel@tonic-gate case T_NMIFLT: /* NMI interrupt */ 11537c478bd9Sstevel@tonic-gate printf("Unexpected NMI in system mode\n"); 11547c478bd9Sstevel@tonic-gate goto cleanup; 11557c478bd9Sstevel@tonic-gate 11567c478bd9Sstevel@tonic-gate case T_NMIFLT + USER: /* NMI interrupt */ 11577c478bd9Sstevel@tonic-gate printf("Unexpected NMI in user mode\n"); 11587c478bd9Sstevel@tonic-gate break; 11597c478bd9Sstevel@tonic-gate 11607c478bd9Sstevel@tonic-gate case T_GPFLT: /* general protection violation */ 11617c478bd9Sstevel@tonic-gate /* 1162a4e4e13fSgavinm * Any #GP that occurs during an on_trap .. no_trap bracket 1163a4e4e13fSgavinm * with OT_DATA_ACCESS or OT_SEGMENT_ACCESS protection, 1164a4e4e13fSgavinm * or in a on_fault .. no_fault bracket, is forgiven 1165a4e4e13fSgavinm * and we trampoline. This protection is given regardless 1166a4e4e13fSgavinm * of whether we are 32/64 bit etc - if a distinction is 1167a4e4e13fSgavinm * required then define new on_trap protection types. 1168a4e4e13fSgavinm * 11697c478bd9Sstevel@tonic-gate * On amd64, we can get a #gp from referencing addresses 1170843e1988Sjohnlev * in the virtual address hole e.g. from a copyin or in 1171843e1988Sjohnlev * update_sregs while updating user segment registers. 1172843e1988Sjohnlev * 1173843e1988Sjohnlev * On the 32-bit hypervisor we could also generate one in 1174843e1988Sjohnlev * mfn_to_pfn by reaching around or into where the hypervisor 1175843e1988Sjohnlev * lives which is protected by segmentation. 11767c478bd9Sstevel@tonic-gate */ 11777c478bd9Sstevel@tonic-gate 11787c478bd9Sstevel@tonic-gate /* 11797c478bd9Sstevel@tonic-gate * If we're under on_trap() protection (see <sys/ontrap.h>), 118020c794b3Sgavinm * set ot_trap and trampoline back to the on_trap() call site 1181843e1988Sjohnlev * for OT_DATA_ACCESS or OT_SEGMENT_ACCESS. 11827c478bd9Sstevel@tonic-gate */ 1183ae115bc7Smrj if (ct->t_ontrap != NULL) { 1184843e1988Sjohnlev int ttype = ct->t_ontrap->ot_prot & 1185843e1988Sjohnlev (OT_DATA_ACCESS | OT_SEGMENT_ACCESS); 1186ae115bc7Smrj 1187843e1988Sjohnlev if (ttype != 0) { 1188843e1988Sjohnlev ct->t_ontrap->ot_trap |= ttype; 1189843e1988Sjohnlev if (tudebug) 1190843e1988Sjohnlev showregs(type, rp, (caddr_t)0); 119120c794b3Sgavinm rp->r_pc = ct->t_ontrap->ot_trampoline; 119220c794b3Sgavinm goto cleanup; 11937c478bd9Sstevel@tonic-gate } 1194843e1988Sjohnlev } 11957c478bd9Sstevel@tonic-gate 11967c478bd9Sstevel@tonic-gate /* 11977c478bd9Sstevel@tonic-gate * If we're under lofault protection (copyin etc.), 11987c478bd9Sstevel@tonic-gate * longjmp back to lofault with an EFAULT. 11997c478bd9Sstevel@tonic-gate */ 1200ae115bc7Smrj if (ct->t_lofault) { 12017c478bd9Sstevel@tonic-gate /* 12027c478bd9Sstevel@tonic-gate * Fault is not resolvable, so just return to lofault 12037c478bd9Sstevel@tonic-gate */ 12047c478bd9Sstevel@tonic-gate if (lodebug) { 12057c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 12067c478bd9Sstevel@tonic-gate traceregs(rp); 12077c478bd9Sstevel@tonic-gate } 12087c478bd9Sstevel@tonic-gate rp->r_r0 = EFAULT; 1209ae115bc7Smrj rp->r_pc = ct->t_lofault; 12107c478bd9Sstevel@tonic-gate goto cleanup; 12117c478bd9Sstevel@tonic-gate } 1212a4e4e13fSgavinm 1213a4e4e13fSgavinm /* 1214a4e4e13fSgavinm * We fall through to the next case, which repeats 1215a4e4e13fSgavinm * the OT_SEGMENT_ACCESS check which we've already 1216a4e4e13fSgavinm * done, so we'll always fall through to the 1217a4e4e13fSgavinm * T_STKFLT case. 1218a4e4e13fSgavinm */ 12197c478bd9Sstevel@tonic-gate /*FALLTHROUGH*/ 1220ae115bc7Smrj case T_SEGFLT: /* segment not present fault */ 1221ae115bc7Smrj /* 1222ae115bc7Smrj * One example of this is #NP in update_sregs while 1223ae115bc7Smrj * attempting to update a user segment register 1224ae115bc7Smrj * that points to a descriptor that is marked not 1225ae115bc7Smrj * present. 1226ae115bc7Smrj */ 1227ae115bc7Smrj if (ct->t_ontrap != NULL && 1228ae115bc7Smrj ct->t_ontrap->ot_prot & OT_SEGMENT_ACCESS) { 1229ae115bc7Smrj ct->t_ontrap->ot_trap |= OT_SEGMENT_ACCESS; 1230843e1988Sjohnlev if (tudebug) 1231843e1988Sjohnlev showregs(type, rp, (caddr_t)0); 123220c794b3Sgavinm rp->r_pc = ct->t_ontrap->ot_trampoline; 123320c794b3Sgavinm goto cleanup; 1234ae115bc7Smrj } 1235ae115bc7Smrj /*FALLTHROUGH*/ 12367c478bd9Sstevel@tonic-gate case T_STKFLT: /* stack fault */ 12377c478bd9Sstevel@tonic-gate case T_TSSFLT: /* invalid TSS fault */ 12387c478bd9Sstevel@tonic-gate if (tudebug) 12397c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 12407c478bd9Sstevel@tonic-gate if (kern_gpfault(rp)) 12417c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 12427c478bd9Sstevel@tonic-gate goto cleanup; 12437c478bd9Sstevel@tonic-gate 12447c478bd9Sstevel@tonic-gate /* 1245ae115bc7Smrj * ONLY 32-bit PROCESSES can USE a PRIVATE LDT! 64-bit apps 1246ae115bc7Smrj * should have no need for them, so we put a stop to it here. 12477c478bd9Sstevel@tonic-gate * 1248ae115bc7Smrj * So: not-present fault is ONLY valid for 32-bit processes with 1249ae115bc7Smrj * a private LDT trying to do a system call. Emulate it. 12500baeff3dSrab * 1251ae115bc7Smrj * #gp fault is ONLY valid for 32-bit processes also, which DO NOT 1252ae115bc7Smrj * have a private LDT, and are trying to do a system call. Emulate it. 12530baeff3dSrab */ 1254ae115bc7Smrj 12550baeff3dSrab case T_SEGFLT + USER: /* segment not present fault */ 12560baeff3dSrab case T_GPFLT + USER: /* general protection violation */ 12570baeff3dSrab #ifdef _SYSCALL32_IMPL 12580baeff3dSrab if (p->p_model != DATAMODEL_NATIVE) { 12590baeff3dSrab #endif /* _SYSCALL32_IMPL */ 1260ddece0baSsethg if (instr_is_lcall_syscall((caddr_t)rp->r_pc)) { 12610baeff3dSrab if (type == T_SEGFLT + USER) 12620baeff3dSrab ASSERT(p->p_ldt != NULL); 12630baeff3dSrab 12640baeff3dSrab if ((p->p_ldt == NULL && type == T_GPFLT + USER) || 12650baeff3dSrab type == T_SEGFLT + USER) { 12660baeff3dSrab 12670baeff3dSrab /* 12680baeff3dSrab * The user attempted a system call via the obsolete 12690baeff3dSrab * call gate mechanism. Because the process doesn't have 12700baeff3dSrab * an LDT (i.e. the ldtr contains 0), a #gp results. 12710baeff3dSrab * Emulate the syscall here, just as we do above for a 12720baeff3dSrab * #np trap. 12730baeff3dSrab */ 12740baeff3dSrab 12750baeff3dSrab /* 12767c478bd9Sstevel@tonic-gate * Since this is a not-present trap, rp->r_pc points to 12777c478bd9Sstevel@tonic-gate * the trapping lcall instruction. We need to bump it 12787c478bd9Sstevel@tonic-gate * to the next insn so the app can continue on. 12797c478bd9Sstevel@tonic-gate */ 12807c478bd9Sstevel@tonic-gate rp->r_pc += LCALLSIZE; 12817c478bd9Sstevel@tonic-gate lwp->lwp_regs = rp; 12827c478bd9Sstevel@tonic-gate 12837c478bd9Sstevel@tonic-gate /* 12847c478bd9Sstevel@tonic-gate * Normally the microstate of the LWP is forced back to 12857c478bd9Sstevel@tonic-gate * LMS_USER by the syscall handlers. Emulate that 12867c478bd9Sstevel@tonic-gate * behavior here. 12877c478bd9Sstevel@tonic-gate */ 12887c478bd9Sstevel@tonic-gate mstate = LMS_USER; 12897c478bd9Sstevel@tonic-gate 12907c478bd9Sstevel@tonic-gate dosyscall(); 12917c478bd9Sstevel@tonic-gate goto out; 12927c478bd9Sstevel@tonic-gate } 12930baeff3dSrab } 12940baeff3dSrab #ifdef _SYSCALL32_IMPL 12950baeff3dSrab } 12967c478bd9Sstevel@tonic-gate #endif /* _SYSCALL32_IMPL */ 12977c478bd9Sstevel@tonic-gate /* 12987c478bd9Sstevel@tonic-gate * If the current process is using a private LDT and the 12997c478bd9Sstevel@tonic-gate * trapping instruction is sysenter, the sysenter instruction 13007c478bd9Sstevel@tonic-gate * has been disabled on the CPU because it destroys segment 13017c478bd9Sstevel@tonic-gate * registers. If this is the case, rewrite the instruction to 13027c478bd9Sstevel@tonic-gate * be a safe system call and retry it. If this occurs on a CPU 13037c478bd9Sstevel@tonic-gate * which doesn't even support sysenter, the result of all of 13047c478bd9Sstevel@tonic-gate * this will be to emulate that particular instruction. 13057c478bd9Sstevel@tonic-gate */ 13067c478bd9Sstevel@tonic-gate if (p->p_ldt != NULL && 13077417cfdeSKuriakose Kuruvilla ldt_rewrite_syscall(rp, p, X86FSET_SEP)) 13087c478bd9Sstevel@tonic-gate goto out; 1309ddece0baSsethg 13107c478bd9Sstevel@tonic-gate /*FALLTHROUGH*/ 13117c478bd9Sstevel@tonic-gate 13127c478bd9Sstevel@tonic-gate case T_BOUNDFLT + USER: /* bound fault */ 13137c478bd9Sstevel@tonic-gate case T_STKFLT + USER: /* stack fault */ 13147c478bd9Sstevel@tonic-gate case T_TSSFLT + USER: /* invalid TSS fault */ 13157c478bd9Sstevel@tonic-gate if (tudebug) 13167c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 13177c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGSEGV; 13187c478bd9Sstevel@tonic-gate siginfo.si_code = SEGV_MAPERR; 13197c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 13207c478bd9Sstevel@tonic-gate fault = FLTBOUNDS; 13217c478bd9Sstevel@tonic-gate break; 13227c478bd9Sstevel@tonic-gate 13237c478bd9Sstevel@tonic-gate case T_ALIGNMENT + USER: /* user alignment error (486) */ 13247c478bd9Sstevel@tonic-gate if (tudebug) 13257c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 13267c478bd9Sstevel@tonic-gate bzero(&siginfo, sizeof (siginfo)); 13277c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGBUS; 13287c478bd9Sstevel@tonic-gate siginfo.si_code = BUS_ADRALN; 13297c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 13307c478bd9Sstevel@tonic-gate fault = FLTACCESS; 13317c478bd9Sstevel@tonic-gate break; 13327c478bd9Sstevel@tonic-gate 13337c478bd9Sstevel@tonic-gate case T_SGLSTP + USER: /* single step/hw breakpoint exception */ 13347c478bd9Sstevel@tonic-gate if (tudebug && tudebugbpt) 13357c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 13367c478bd9Sstevel@tonic-gate 13377c478bd9Sstevel@tonic-gate /* Was it single-stepping? */ 13387c478bd9Sstevel@tonic-gate if (lwp->lwp_pcb.pcb_drstat & DR_SINGLESTEP) { 13397c478bd9Sstevel@tonic-gate pcb_t *pcb = &lwp->lwp_pcb; 13407c478bd9Sstevel@tonic-gate 13417c478bd9Sstevel@tonic-gate rp->r_ps &= ~PS_T; 13427c478bd9Sstevel@tonic-gate /* 13437c478bd9Sstevel@tonic-gate * If both NORMAL_STEP and WATCH_STEP are in effect, 13449acbbeafSnn35248 * give precedence to WATCH_STEP. If neither is set, 13457c478bd9Sstevel@tonic-gate * user must have set the PS_T bit in %efl; treat this 13467c478bd9Sstevel@tonic-gate * as NORMAL_STEP. 13477c478bd9Sstevel@tonic-gate */ 13489acbbeafSnn35248 if ((fault = undo_watch_step(&siginfo)) == 0 && 13499acbbeafSnn35248 ((pcb->pcb_flags & NORMAL_STEP) || 13509acbbeafSnn35248 !(pcb->pcb_flags & WATCH_STEP))) { 13517c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGTRAP; 13527c478bd9Sstevel@tonic-gate siginfo.si_code = TRAP_TRACE; 13537c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 13547c478bd9Sstevel@tonic-gate fault = FLTTRACE; 13557c478bd9Sstevel@tonic-gate } 13567c478bd9Sstevel@tonic-gate pcb->pcb_flags &= ~(NORMAL_STEP|WATCH_STEP); 13577c478bd9Sstevel@tonic-gate } 13587c478bd9Sstevel@tonic-gate break; 13597c478bd9Sstevel@tonic-gate 13607c478bd9Sstevel@tonic-gate case T_BPTFLT + USER: /* breakpoint trap */ 13617c478bd9Sstevel@tonic-gate if (tudebug && tudebugbpt) 13627c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 13637c478bd9Sstevel@tonic-gate /* 13647c478bd9Sstevel@tonic-gate * int 3 (the breakpoint instruction) leaves the pc referring 13657c478bd9Sstevel@tonic-gate * to the address one byte after the breakpointed address. 13667c478bd9Sstevel@tonic-gate * If the P_PR_BPTADJ flag has been set via /proc, We adjust 13677c478bd9Sstevel@tonic-gate * it back so it refers to the breakpointed address. 13687c478bd9Sstevel@tonic-gate */ 13697c478bd9Sstevel@tonic-gate if (p->p_proc_flag & P_PR_BPTADJ) 13707c478bd9Sstevel@tonic-gate rp->r_pc--; 13717c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGTRAP; 13727c478bd9Sstevel@tonic-gate siginfo.si_code = TRAP_BRKPT; 13737c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 13747c478bd9Sstevel@tonic-gate fault = FLTBPT; 13757c478bd9Sstevel@tonic-gate break; 13767c478bd9Sstevel@tonic-gate 13777c478bd9Sstevel@tonic-gate case T_AST: 13787c478bd9Sstevel@tonic-gate /* 13797c478bd9Sstevel@tonic-gate * This occurs only after the cs register has been made to 13807c478bd9Sstevel@tonic-gate * look like a kernel selector, either through debugging or 13817c478bd9Sstevel@tonic-gate * possibly by functions like setcontext(). The thread is 13827c478bd9Sstevel@tonic-gate * about to cause a general protection fault at common_iret() 13837c478bd9Sstevel@tonic-gate * in locore. We let that happen immediately instead of 13847c478bd9Sstevel@tonic-gate * doing the T_AST processing. 13857c478bd9Sstevel@tonic-gate */ 13867c478bd9Sstevel@tonic-gate goto cleanup; 13877c478bd9Sstevel@tonic-gate 138820c794b3Sgavinm case T_AST + USER: /* profiling, resched, h/w error pseudo trap */ 138920c794b3Sgavinm if (lwp->lwp_pcb.pcb_flags & ASYNC_HWERR) { 139020c794b3Sgavinm proc_t *p = ttoproc(curthread); 1391d6c90996SAbhinandan Ekande extern void print_msg_hwerr(ctid_t ct_id, proc_t *p); 139220c794b3Sgavinm 139320c794b3Sgavinm lwp->lwp_pcb.pcb_flags &= ~ASYNC_HWERR; 1394d6c90996SAbhinandan Ekande print_msg_hwerr(p->p_ct_process->conp_contract.ct_id, 1395d6c90996SAbhinandan Ekande p); 139620c794b3Sgavinm contract_process_hwerr(p->p_ct_process, p); 139720c794b3Sgavinm siginfo.si_signo = SIGKILL; 139820c794b3Sgavinm siginfo.si_code = SI_NOINFO; 139920c794b3Sgavinm } else if (lwp->lwp_pcb.pcb_flags & CPC_OVERFLOW) { 14007c478bd9Sstevel@tonic-gate lwp->lwp_pcb.pcb_flags &= ~CPC_OVERFLOW; 14017c478bd9Sstevel@tonic-gate if (kcpc_overflow_ast()) { 14027c478bd9Sstevel@tonic-gate /* 14037c478bd9Sstevel@tonic-gate * Signal performance counter overflow 14047c478bd9Sstevel@tonic-gate */ 14057c478bd9Sstevel@tonic-gate if (tudebug) 14067c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 14077c478bd9Sstevel@tonic-gate bzero(&siginfo, sizeof (siginfo)); 14087c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGEMT; 14097c478bd9Sstevel@tonic-gate siginfo.si_code = EMT_CPCOVF; 14107c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 14117c478bd9Sstevel@tonic-gate fault = FLTCPCOVF; 14127c478bd9Sstevel@tonic-gate } 14137c478bd9Sstevel@tonic-gate } 141420c794b3Sgavinm 14157c478bd9Sstevel@tonic-gate break; 14167c478bd9Sstevel@tonic-gate } 14177c478bd9Sstevel@tonic-gate 14187c478bd9Sstevel@tonic-gate /* 14197c478bd9Sstevel@tonic-gate * We can't get here from a system trap 14207c478bd9Sstevel@tonic-gate */ 14217c478bd9Sstevel@tonic-gate ASSERT(type & USER); 14227c478bd9Sstevel@tonic-gate 14237c478bd9Sstevel@tonic-gate if (fault) { 142410e812d4Saf /* We took a fault so abort single step. */ 142510e812d4Saf lwp->lwp_pcb.pcb_flags &= ~(NORMAL_STEP|WATCH_STEP); 14267c478bd9Sstevel@tonic-gate /* 14277c478bd9Sstevel@tonic-gate * Remember the fault and fault adddress 14287c478bd9Sstevel@tonic-gate * for real-time (SIGPROF) profiling. 14297c478bd9Sstevel@tonic-gate */ 14307c478bd9Sstevel@tonic-gate lwp->lwp_lastfault = fault; 14317c478bd9Sstevel@tonic-gate lwp->lwp_lastfaddr = siginfo.si_addr; 14327c478bd9Sstevel@tonic-gate 14337c478bd9Sstevel@tonic-gate DTRACE_PROC2(fault, int, fault, ksiginfo_t *, &siginfo); 14347c478bd9Sstevel@tonic-gate 14357c478bd9Sstevel@tonic-gate /* 14367c478bd9Sstevel@tonic-gate * If a debugger has declared this fault to be an 14377c478bd9Sstevel@tonic-gate * event of interest, stop the lwp. Otherwise just 14387c478bd9Sstevel@tonic-gate * deliver the associated signal. 14397c478bd9Sstevel@tonic-gate */ 14407c478bd9Sstevel@tonic-gate if (siginfo.si_signo != SIGKILL && 14417c478bd9Sstevel@tonic-gate prismember(&p->p_fltmask, fault) && 14427c478bd9Sstevel@tonic-gate stop_on_fault(fault, &siginfo) == 0) 14437c478bd9Sstevel@tonic-gate siginfo.si_signo = 0; 14447c478bd9Sstevel@tonic-gate } 14457c478bd9Sstevel@tonic-gate 14467c478bd9Sstevel@tonic-gate if (siginfo.si_signo) 14476075fa3dSRoger A. Faulkner trapsig(&siginfo, (fault != FLTFPE && fault != FLTCPCOVF)); 14487c478bd9Sstevel@tonic-gate 14497c478bd9Sstevel@tonic-gate if (lwp->lwp_oweupc) 14507c478bd9Sstevel@tonic-gate profil_tick(rp->r_pc); 14517c478bd9Sstevel@tonic-gate 1452ae115bc7Smrj if (ct->t_astflag | ct->t_sig_check) { 14537c478bd9Sstevel@tonic-gate /* 14547c478bd9Sstevel@tonic-gate * Turn off the AST flag before checking all the conditions that 14557c478bd9Sstevel@tonic-gate * may have caused an AST. This flag is on whenever a signal or 14567c478bd9Sstevel@tonic-gate * unusual condition should be handled after the next trap or 14577c478bd9Sstevel@tonic-gate * syscall. 14587c478bd9Sstevel@tonic-gate */ 1459ae115bc7Smrj astoff(ct); 1460d8aa0f5aSsudheer /* 1461d8aa0f5aSsudheer * If a single-step trap occurred on a syscall (see above) 1462d8aa0f5aSsudheer * recognize it now. Do this before checking for signals 1463d8aa0f5aSsudheer * because deferred_singlestep_trap() may generate a SIGTRAP to 1464d8aa0f5aSsudheer * the LWP or may otherwise mark the LWP to call issig(FORREAL). 1465d8aa0f5aSsudheer */ 1466d8aa0f5aSsudheer if (lwp->lwp_pcb.pcb_flags & DEBUG_PENDING) 1467d8aa0f5aSsudheer deferred_singlestep_trap((caddr_t)rp->r_pc); 1468d8aa0f5aSsudheer 1469ae115bc7Smrj ct->t_sig_check = 0; 14707c478bd9Sstevel@tonic-gate 14717429414eSBryan Cantrill /* 14727429414eSBryan Cantrill * As in other code paths that check against TP_CHANGEBIND, 14737429414eSBryan Cantrill * we perform the check first without p_lock held -- only 14747429414eSBryan Cantrill * acquiring p_lock in the unlikely event that it is indeed 14757429414eSBryan Cantrill * set. This is safe because we are doing this after the 14767429414eSBryan Cantrill * astoff(); if we are racing another thread setting 14777429414eSBryan Cantrill * TP_CHANGEBIND on us, we will pick it up on a subsequent 14787429414eSBryan Cantrill * lap through. 14797429414eSBryan Cantrill */ 14807429414eSBryan Cantrill if (curthread->t_proc_flag & TP_CHANGEBIND) { 14817c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 14827c478bd9Sstevel@tonic-gate if (curthread->t_proc_flag & TP_CHANGEBIND) { 14837c478bd9Sstevel@tonic-gate timer_lwpbind(); 14847c478bd9Sstevel@tonic-gate curthread->t_proc_flag &= ~TP_CHANGEBIND; 14857c478bd9Sstevel@tonic-gate } 14867c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 14877429414eSBryan Cantrill } 14887c478bd9Sstevel@tonic-gate 14897c478bd9Sstevel@tonic-gate /* 14907c478bd9Sstevel@tonic-gate * for kaio requests that are on the per-process poll queue, 14917c478bd9Sstevel@tonic-gate * aiop->aio_pollq, they're AIO_POLL bit is set, the kernel 14927c478bd9Sstevel@tonic-gate * should copyout their result_t to user memory. by copying 14937c478bd9Sstevel@tonic-gate * out the result_t, the user can poll on memory waiting 14947c478bd9Sstevel@tonic-gate * for the kaio request to complete. 14957c478bd9Sstevel@tonic-gate */ 14967c478bd9Sstevel@tonic-gate if (p->p_aio) 14977c478bd9Sstevel@tonic-gate aio_cleanup(0); 14987c478bd9Sstevel@tonic-gate /* 14997c478bd9Sstevel@tonic-gate * If this LWP was asked to hold, call holdlwp(), which will 15007c478bd9Sstevel@tonic-gate * stop. holdlwps() sets this up and calls pokelwps() which 15017c478bd9Sstevel@tonic-gate * sets the AST flag. 15027c478bd9Sstevel@tonic-gate * 15037c478bd9Sstevel@tonic-gate * Also check TP_EXITLWP, since this is used by fresh new LWPs 15047c478bd9Sstevel@tonic-gate * through lwp_rtt(). That flag is set if the lwp_create(2) 15057c478bd9Sstevel@tonic-gate * syscall failed after creating the LWP. 15067c478bd9Sstevel@tonic-gate */ 15077c478bd9Sstevel@tonic-gate if (ISHOLD(p)) 15087c478bd9Sstevel@tonic-gate holdlwp(); 15097c478bd9Sstevel@tonic-gate 15107c478bd9Sstevel@tonic-gate /* 15117c478bd9Sstevel@tonic-gate * All code that sets signals and makes ISSIG evaluate true must 15127c478bd9Sstevel@tonic-gate * set t_astflag afterwards. 15137c478bd9Sstevel@tonic-gate */ 1514ae115bc7Smrj if (ISSIG_PENDING(ct, lwp, p)) { 15157c478bd9Sstevel@tonic-gate if (issig(FORREAL)) 15167c478bd9Sstevel@tonic-gate psig(); 1517ae115bc7Smrj ct->t_sig_check = 1; 15187c478bd9Sstevel@tonic-gate } 15197c478bd9Sstevel@tonic-gate 1520ae115bc7Smrj if (ct->t_rprof != NULL) { 1521e0cf54a5SRoger A. Faulkner realsigprof(0, 0, 0); 1522ae115bc7Smrj ct->t_sig_check = 1; 15237c478bd9Sstevel@tonic-gate } 152465a89a64Smarx 152565a89a64Smarx /* 152665a89a64Smarx * /proc can't enable/disable the trace bit itself 152765a89a64Smarx * because that could race with the call gate used by 152865a89a64Smarx * system calls via "lcall". If that happened, an 152965a89a64Smarx * invalid EFLAGS would result. prstep()/prnostep() 153065a89a64Smarx * therefore schedule an AST for the purpose. 153165a89a64Smarx */ 153265a89a64Smarx if (lwp->lwp_pcb.pcb_flags & REQUEST_STEP) { 153365a89a64Smarx lwp->lwp_pcb.pcb_flags &= ~REQUEST_STEP; 153465a89a64Smarx rp->r_ps |= PS_T; 153565a89a64Smarx } 153665a89a64Smarx if (lwp->lwp_pcb.pcb_flags & REQUEST_NOSTEP) { 153765a89a64Smarx lwp->lwp_pcb.pcb_flags &= ~REQUEST_NOSTEP; 153865a89a64Smarx rp->r_ps &= ~PS_T; 153965a89a64Smarx } 15407c478bd9Sstevel@tonic-gate } 15417c478bd9Sstevel@tonic-gate 15427c478bd9Sstevel@tonic-gate out: /* We can't get here from a system trap */ 15437c478bd9Sstevel@tonic-gate ASSERT(type & USER); 15447c478bd9Sstevel@tonic-gate 15457c478bd9Sstevel@tonic-gate if (ISHOLD(p)) 15467c478bd9Sstevel@tonic-gate holdlwp(); 15477c478bd9Sstevel@tonic-gate 15487c478bd9Sstevel@tonic-gate /* 15497c478bd9Sstevel@tonic-gate * Set state to LWP_USER here so preempt won't give us a kernel 15507c478bd9Sstevel@tonic-gate * priority if it occurs after this point. Call CL_TRAPRET() to 15517c478bd9Sstevel@tonic-gate * restore the user-level priority. 15527c478bd9Sstevel@tonic-gate * 15537c478bd9Sstevel@tonic-gate * It is important that no locks (other than spinlocks) be entered 15547c478bd9Sstevel@tonic-gate * after this point before returning to user mode (unless lwp_state 15557c478bd9Sstevel@tonic-gate * is set back to LWP_SYS). 15567c478bd9Sstevel@tonic-gate */ 15577c478bd9Sstevel@tonic-gate lwp->lwp_state = LWP_USER; 15587c478bd9Sstevel@tonic-gate 1559ae115bc7Smrj if (ct->t_trapret) { 1560ae115bc7Smrj ct->t_trapret = 0; 1561ae115bc7Smrj thread_lock(ct); 1562ae115bc7Smrj CL_TRAPRET(ct); 1563ae115bc7Smrj thread_unlock(ct); 15647c478bd9Sstevel@tonic-gate } 1565c97ad5cdSakolb if (CPU->cpu_runrun || curthread->t_schedflag & TS_ANYWAITQ) 15667c478bd9Sstevel@tonic-gate preempt(); 156707a48826SRoger A. Faulkner prunstop(); 1568ae115bc7Smrj (void) new_mstate(ct, mstate); 15697c478bd9Sstevel@tonic-gate 15707c478bd9Sstevel@tonic-gate /* Kernel probe */ 15717c478bd9Sstevel@tonic-gate TNF_PROBE_1(thread_state, "thread", /* CSTYLED */, 15727c478bd9Sstevel@tonic-gate tnf_microstate, state, LMS_USER); 15737c478bd9Sstevel@tonic-gate 15747c478bd9Sstevel@tonic-gate return; 15757c478bd9Sstevel@tonic-gate 15767c478bd9Sstevel@tonic-gate cleanup: /* system traps end up here */ 15777c478bd9Sstevel@tonic-gate ASSERT(!(type & USER)); 15787c478bd9Sstevel@tonic-gate } 15797c478bd9Sstevel@tonic-gate 15807c478bd9Sstevel@tonic-gate /* 15817c478bd9Sstevel@tonic-gate * Patch non-zero to disable preemption of threads in the kernel. 15827c478bd9Sstevel@tonic-gate */ 15837c478bd9Sstevel@tonic-gate int IGNORE_KERNEL_PREEMPTION = 0; /* XXX - delete this someday */ 15847c478bd9Sstevel@tonic-gate 15857c478bd9Sstevel@tonic-gate struct kpreempt_cnts { /* kernel preemption statistics */ 15867c478bd9Sstevel@tonic-gate int kpc_idle; /* executing idle thread */ 15877c478bd9Sstevel@tonic-gate int kpc_intr; /* executing interrupt thread */ 15887c478bd9Sstevel@tonic-gate int kpc_clock; /* executing clock thread */ 15897c478bd9Sstevel@tonic-gate int kpc_blocked; /* thread has blocked preemption (t_preempt) */ 15907c478bd9Sstevel@tonic-gate int kpc_notonproc; /* thread is surrendering processor */ 15917c478bd9Sstevel@tonic-gate int kpc_inswtch; /* thread has ratified scheduling decision */ 15927c478bd9Sstevel@tonic-gate int kpc_prilevel; /* processor interrupt level is too high */ 15937c478bd9Sstevel@tonic-gate int kpc_apreempt; /* asynchronous preemption */ 15947c478bd9Sstevel@tonic-gate int kpc_spreempt; /* synchronous preemption */ 15957c478bd9Sstevel@tonic-gate } kpreempt_cnts; 15967c478bd9Sstevel@tonic-gate 15977c478bd9Sstevel@tonic-gate /* 15987c478bd9Sstevel@tonic-gate * kernel preemption: forced rescheduling, preempt the running kernel thread. 15997c478bd9Sstevel@tonic-gate * the argument is old PIL for an interrupt, 16007c478bd9Sstevel@tonic-gate * or the distingished value KPREEMPT_SYNC. 16017c478bd9Sstevel@tonic-gate */ 16027c478bd9Sstevel@tonic-gate void 16037c478bd9Sstevel@tonic-gate kpreempt(int asyncspl) 16047c478bd9Sstevel@tonic-gate { 1605ae115bc7Smrj kthread_t *ct = curthread; 16067c478bd9Sstevel@tonic-gate 16077c478bd9Sstevel@tonic-gate if (IGNORE_KERNEL_PREEMPTION) { 16087c478bd9Sstevel@tonic-gate aston(CPU->cpu_dispthread); 16097c478bd9Sstevel@tonic-gate return; 16107c478bd9Sstevel@tonic-gate } 16117c478bd9Sstevel@tonic-gate 16127c478bd9Sstevel@tonic-gate /* 16137c478bd9Sstevel@tonic-gate * Check that conditions are right for kernel preemption 16147c478bd9Sstevel@tonic-gate */ 16157c478bd9Sstevel@tonic-gate do { 1616ae115bc7Smrj if (ct->t_preempt) { 16177c478bd9Sstevel@tonic-gate /* 16187c478bd9Sstevel@tonic-gate * either a privileged thread (idle, panic, interrupt) 16197c478bd9Sstevel@tonic-gate * or will check when t_preempt is lowered 1620b6d5e9b6SPramod Batni * We need to specifically handle the case where 1621b6d5e9b6SPramod Batni * the thread is in the middle of swtch (resume has 1622b6d5e9b6SPramod Batni * been called) and has its t_preempt set 1623b6d5e9b6SPramod Batni * [idle thread and a thread which is in kpreempt 1624b6d5e9b6SPramod Batni * already] and then a high priority thread is 1625b6d5e9b6SPramod Batni * available in the local dispatch queue. 1626b6d5e9b6SPramod Batni * In this case the resumed thread needs to take a 1627b6d5e9b6SPramod Batni * trap so that it can call kpreempt. We achieve 1628b6d5e9b6SPramod Batni * this by using siron(). 1629b6d5e9b6SPramod Batni * How do we detect this condition: 1630b6d5e9b6SPramod Batni * idle thread is running and is in the midst of 1631b6d5e9b6SPramod Batni * resume: curthread->t_pri == -1 && CPU->dispthread 1632b6d5e9b6SPramod Batni * != CPU->thread 1633b6d5e9b6SPramod Batni * Need to ensure that this happens only at high pil 1634b6d5e9b6SPramod Batni * resume is called at high pil 1635b6d5e9b6SPramod Batni * Only in resume_from_idle is the pil changed. 16367c478bd9Sstevel@tonic-gate */ 1637b6d5e9b6SPramod Batni if (ct->t_pri < 0) { 16387c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_idle++; 1639b6d5e9b6SPramod Batni if (CPU->cpu_dispthread != CPU->cpu_thread) 1640b6d5e9b6SPramod Batni siron(); 1641b6d5e9b6SPramod Batni } else if (ct->t_flag & T_INTR_THREAD) { 16427c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_intr++; 1643ae115bc7Smrj if (ct->t_pil == CLOCK_LEVEL) 16447c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_clock++; 1645b6d5e9b6SPramod Batni } else { 16467c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_blocked++; 1647b6d5e9b6SPramod Batni if (CPU->cpu_dispthread != CPU->cpu_thread) 1648b6d5e9b6SPramod Batni siron(); 1649b6d5e9b6SPramod Batni } 16507c478bd9Sstevel@tonic-gate aston(CPU->cpu_dispthread); 16517c478bd9Sstevel@tonic-gate return; 16527c478bd9Sstevel@tonic-gate } 1653ae115bc7Smrj if (ct->t_state != TS_ONPROC || 1654ae115bc7Smrj ct->t_disp_queue != CPU->cpu_disp) { 16557c478bd9Sstevel@tonic-gate /* this thread will be calling swtch() shortly */ 16567c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_notonproc++; 16577c478bd9Sstevel@tonic-gate if (CPU->cpu_thread != CPU->cpu_dispthread) { 16587c478bd9Sstevel@tonic-gate /* already in swtch(), force another */ 16597c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_inswtch++; 16607c478bd9Sstevel@tonic-gate siron(); 16617c478bd9Sstevel@tonic-gate } 16627c478bd9Sstevel@tonic-gate return; 16637c478bd9Sstevel@tonic-gate } 16647c478bd9Sstevel@tonic-gate if (getpil() >= DISP_LEVEL) { 16657c478bd9Sstevel@tonic-gate /* 16667c478bd9Sstevel@tonic-gate * We can't preempt this thread if it is at 16677c478bd9Sstevel@tonic-gate * a PIL >= DISP_LEVEL since it may be holding 16687c478bd9Sstevel@tonic-gate * a spin lock (like sched_lock). 16697c478bd9Sstevel@tonic-gate */ 16707c478bd9Sstevel@tonic-gate siron(); /* check back later */ 16717c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_prilevel++; 16727c478bd9Sstevel@tonic-gate return; 16737c478bd9Sstevel@tonic-gate } 1674ae115bc7Smrj if (!interrupts_enabled()) { 1675ae115bc7Smrj /* 1676ae115bc7Smrj * Can't preempt while running with ints disabled 1677ae115bc7Smrj */ 1678ae115bc7Smrj kpreempt_cnts.kpc_prilevel++; 1679ae115bc7Smrj return; 1680ae115bc7Smrj } 16817c478bd9Sstevel@tonic-gate if (asyncspl != KPREEMPT_SYNC) 16827c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_apreempt++; 16837c478bd9Sstevel@tonic-gate else 16847c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_spreempt++; 16857c478bd9Sstevel@tonic-gate 1686ae115bc7Smrj ct->t_preempt++; 16877c478bd9Sstevel@tonic-gate preempt(); 1688ae115bc7Smrj ct->t_preempt--; 16897c478bd9Sstevel@tonic-gate } while (CPU->cpu_kprunrun); 16907c478bd9Sstevel@tonic-gate } 16917c478bd9Sstevel@tonic-gate 16927c478bd9Sstevel@tonic-gate /* 16937c478bd9Sstevel@tonic-gate * Print out debugging info. 16947c478bd9Sstevel@tonic-gate */ 16957c478bd9Sstevel@tonic-gate static void 16967c478bd9Sstevel@tonic-gate showregs(uint_t type, struct regs *rp, caddr_t addr) 16977c478bd9Sstevel@tonic-gate { 16987c478bd9Sstevel@tonic-gate int s; 16997c478bd9Sstevel@tonic-gate 17007c478bd9Sstevel@tonic-gate s = spl7(); 17017c478bd9Sstevel@tonic-gate type &= ~USER; 1702ae115bc7Smrj if (PTOU(curproc)->u_comm[0]) 1703ae115bc7Smrj printf("%s: ", PTOU(curproc)->u_comm); 17047c478bd9Sstevel@tonic-gate if (type < TRAP_TYPES) 17057c478bd9Sstevel@tonic-gate printf("#%s %s\n", trap_type_mnemonic[type], trap_type[type]); 17067c478bd9Sstevel@tonic-gate else 17077c478bd9Sstevel@tonic-gate switch (type) { 17087c478bd9Sstevel@tonic-gate case T_SYSCALL: 17097c478bd9Sstevel@tonic-gate printf("Syscall Trap:\n"); 17107c478bd9Sstevel@tonic-gate break; 17117c478bd9Sstevel@tonic-gate case T_AST: 17127c478bd9Sstevel@tonic-gate printf("AST\n"); 17137c478bd9Sstevel@tonic-gate break; 17147c478bd9Sstevel@tonic-gate default: 17157c478bd9Sstevel@tonic-gate printf("Bad Trap = %d\n", type); 17167c478bd9Sstevel@tonic-gate break; 17177c478bd9Sstevel@tonic-gate } 17187c478bd9Sstevel@tonic-gate if (type == T_PGFLT) { 17197c478bd9Sstevel@tonic-gate printf("Bad %s fault at addr=0x%lx\n", 17207c478bd9Sstevel@tonic-gate USERMODE(rp->r_cs) ? "user": "kernel", (uintptr_t)addr); 17217c478bd9Sstevel@tonic-gate } else if (addr) { 17227c478bd9Sstevel@tonic-gate printf("addr=0x%lx\n", (uintptr_t)addr); 17237c478bd9Sstevel@tonic-gate } 17247c478bd9Sstevel@tonic-gate 17257c478bd9Sstevel@tonic-gate printf("pid=%d, pc=0x%lx, sp=0x%lx, eflags=0x%lx\n", 17267c478bd9Sstevel@tonic-gate (ttoproc(curthread) && ttoproc(curthread)->p_pidp) ? 17277c478bd9Sstevel@tonic-gate ttoproc(curthread)->p_pid : 0, rp->r_pc, rp->r_sp, rp->r_ps); 17287c478bd9Sstevel@tonic-gate 17297c478bd9Sstevel@tonic-gate #if defined(__lint) 17307c478bd9Sstevel@tonic-gate /* 17317c478bd9Sstevel@tonic-gate * this clause can be deleted when lint bug 4870403 is fixed 17327c478bd9Sstevel@tonic-gate * (lint thinks that bit 32 is illegal in a %b format string) 17337c478bd9Sstevel@tonic-gate */ 17347c478bd9Sstevel@tonic-gate printf("cr0: %x cr4: %b\n", 17357c478bd9Sstevel@tonic-gate (uint_t)getcr0(), (uint_t)getcr4(), FMT_CR4); 17367c478bd9Sstevel@tonic-gate #else 17377c478bd9Sstevel@tonic-gate printf("cr0: %b cr4: %b\n", 17387c478bd9Sstevel@tonic-gate (uint_t)getcr0(), FMT_CR0, (uint_t)getcr4(), FMT_CR4); 1739ae115bc7Smrj #endif /* __lint */ 17407c478bd9Sstevel@tonic-gate 1741843e1988Sjohnlev printf("cr2: %lx", getcr2()); 1742843e1988Sjohnlev #if !defined(__xpv) 1743843e1988Sjohnlev printf("cr3: %lx", getcr3()); 17447c478bd9Sstevel@tonic-gate #if defined(__amd64) 1745843e1988Sjohnlev printf("cr8: %lx\n", getcr8()); 17467c478bd9Sstevel@tonic-gate #endif 1747843e1988Sjohnlev #endif 1748843e1988Sjohnlev printf("\n"); 17497c478bd9Sstevel@tonic-gate 17507c478bd9Sstevel@tonic-gate dumpregs(rp); 17517c478bd9Sstevel@tonic-gate splx(s); 17527c478bd9Sstevel@tonic-gate } 17537c478bd9Sstevel@tonic-gate 17547c478bd9Sstevel@tonic-gate static void 17557c478bd9Sstevel@tonic-gate dumpregs(struct regs *rp) 17567c478bd9Sstevel@tonic-gate { 17577c478bd9Sstevel@tonic-gate #if defined(__amd64) 17587c478bd9Sstevel@tonic-gate const char fmt[] = "\t%3s: %16lx %3s: %16lx %3s: %16lx\n"; 17597c478bd9Sstevel@tonic-gate 17607c478bd9Sstevel@tonic-gate printf(fmt, "rdi", rp->r_rdi, "rsi", rp->r_rsi, "rdx", rp->r_rdx); 17617c478bd9Sstevel@tonic-gate printf(fmt, "rcx", rp->r_rcx, " r8", rp->r_r8, " r9", rp->r_r9); 17627c478bd9Sstevel@tonic-gate printf(fmt, "rax", rp->r_rax, "rbx", rp->r_rbx, "rbp", rp->r_rbp); 17637c478bd9Sstevel@tonic-gate printf(fmt, "r10", rp->r_r10, "r11", rp->r_r11, "r12", rp->r_r12); 17647c478bd9Sstevel@tonic-gate printf(fmt, "r13", rp->r_r13, "r14", rp->r_r14, "r15", rp->r_r15); 17657c478bd9Sstevel@tonic-gate 1766ae115bc7Smrj printf(fmt, "fsb", rdmsr(MSR_AMD_FSBASE), "gsb", rdmsr(MSR_AMD_GSBASE), 1767ae115bc7Smrj " ds", rp->r_ds); 17687c478bd9Sstevel@tonic-gate printf(fmt, " es", rp->r_es, " fs", rp->r_fs, " gs", rp->r_gs); 17697c478bd9Sstevel@tonic-gate 17707c478bd9Sstevel@tonic-gate printf(fmt, "trp", rp->r_trapno, "err", rp->r_err, "rip", rp->r_rip); 17717c478bd9Sstevel@tonic-gate printf(fmt, " cs", rp->r_cs, "rfl", rp->r_rfl, "rsp", rp->r_rsp); 17727c478bd9Sstevel@tonic-gate 17737c478bd9Sstevel@tonic-gate printf("\t%3s: %16lx\n", " ss", rp->r_ss); 17747c478bd9Sstevel@tonic-gate 17757c478bd9Sstevel@tonic-gate #elif defined(__i386) 17767c478bd9Sstevel@tonic-gate const char fmt[] = "\t%3s: %8lx %3s: %8lx %3s: %8lx %3s: %8lx\n"; 17777c478bd9Sstevel@tonic-gate 17787c478bd9Sstevel@tonic-gate printf(fmt, " gs", rp->r_gs, " fs", rp->r_fs, 17797c478bd9Sstevel@tonic-gate " es", rp->r_es, " ds", rp->r_ds); 17807c478bd9Sstevel@tonic-gate printf(fmt, "edi", rp->r_edi, "esi", rp->r_esi, 17817c478bd9Sstevel@tonic-gate "ebp", rp->r_ebp, "esp", rp->r_esp); 17827c478bd9Sstevel@tonic-gate printf(fmt, "ebx", rp->r_ebx, "edx", rp->r_edx, 17837c478bd9Sstevel@tonic-gate "ecx", rp->r_ecx, "eax", rp->r_eax); 17847c478bd9Sstevel@tonic-gate printf(fmt, "trp", rp->r_trapno, "err", rp->r_err, 17857c478bd9Sstevel@tonic-gate "eip", rp->r_eip, " cs", rp->r_cs); 17867c478bd9Sstevel@tonic-gate printf("\t%3s: %8lx %3s: %8lx %3s: %8lx\n", 17877c478bd9Sstevel@tonic-gate "efl", rp->r_efl, "usp", rp->r_uesp, " ss", rp->r_ss); 17887c478bd9Sstevel@tonic-gate 17897c478bd9Sstevel@tonic-gate #endif /* __i386 */ 17907c478bd9Sstevel@tonic-gate } 17917c478bd9Sstevel@tonic-gate 17927c478bd9Sstevel@tonic-gate /* 1793843e1988Sjohnlev * Test to see if the instruction is iret on i386 or iretq on amd64. 1794843e1988Sjohnlev * 1795843e1988Sjohnlev * On the hypervisor we can only test for nopop_sys_rtt_syscall. If true 1796843e1988Sjohnlev * then we are in the context of hypervisor's failsafe handler because it 1797843e1988Sjohnlev * tried to iret and failed due to a bad selector. See xen_failsafe_callback. 1798843e1988Sjohnlev */ 1799843e1988Sjohnlev static int 1800843e1988Sjohnlev instr_is_iret(caddr_t pc) 1801843e1988Sjohnlev { 1802843e1988Sjohnlev 1803843e1988Sjohnlev #if defined(__xpv) 1804843e1988Sjohnlev extern void nopop_sys_rtt_syscall(void); 1805843e1988Sjohnlev return ((pc == (caddr_t)nopop_sys_rtt_syscall) ? 1 : 0); 1806843e1988Sjohnlev 1807843e1988Sjohnlev #else 1808843e1988Sjohnlev 1809843e1988Sjohnlev #if defined(__amd64) 1810843e1988Sjohnlev static const uint8_t iret_insn[2] = { 0x48, 0xcf }; /* iretq */ 1811843e1988Sjohnlev 1812843e1988Sjohnlev #elif defined(__i386) 1813843e1988Sjohnlev static const uint8_t iret_insn[1] = { 0xcf }; /* iret */ 1814843e1988Sjohnlev #endif /* __i386 */ 1815843e1988Sjohnlev return (bcmp(pc, iret_insn, sizeof (iret_insn)) == 0); 1816843e1988Sjohnlev 1817843e1988Sjohnlev #endif /* __xpv */ 1818843e1988Sjohnlev } 1819843e1988Sjohnlev 1820843e1988Sjohnlev #if defined(__i386) 1821843e1988Sjohnlev 1822843e1988Sjohnlev /* 1823843e1988Sjohnlev * Test to see if the instruction is part of __SEGREGS_POP 1824843e1988Sjohnlev * 1825843e1988Sjohnlev * Note carefully the appallingly awful dependency between 1826843e1988Sjohnlev * the instruction sequence used in __SEGREGS_POP and these 1827843e1988Sjohnlev * instructions encoded here. 1828843e1988Sjohnlev */ 1829843e1988Sjohnlev static int 1830843e1988Sjohnlev instr_is_segregs_pop(caddr_t pc) 1831843e1988Sjohnlev { 1832843e1988Sjohnlev static const uint8_t movw_0_esp_gs[4] = { 0x8e, 0x6c, 0x24, 0x0 }; 1833843e1988Sjohnlev static const uint8_t movw_4_esp_fs[4] = { 0x8e, 0x64, 0x24, 0x4 }; 1834843e1988Sjohnlev static const uint8_t movw_8_esp_es[4] = { 0x8e, 0x44, 0x24, 0x8 }; 1835843e1988Sjohnlev static const uint8_t movw_c_esp_ds[4] = { 0x8e, 0x5c, 0x24, 0xc }; 1836843e1988Sjohnlev 1837843e1988Sjohnlev if (bcmp(pc, movw_0_esp_gs, sizeof (movw_0_esp_gs)) == 0 || 1838843e1988Sjohnlev bcmp(pc, movw_4_esp_fs, sizeof (movw_4_esp_fs)) == 0 || 1839843e1988Sjohnlev bcmp(pc, movw_8_esp_es, sizeof (movw_8_esp_es)) == 0 || 1840843e1988Sjohnlev bcmp(pc, movw_c_esp_ds, sizeof (movw_c_esp_ds)) == 0) 1841843e1988Sjohnlev return (1); 1842843e1988Sjohnlev 1843843e1988Sjohnlev return (0); 1844843e1988Sjohnlev } 1845843e1988Sjohnlev 1846843e1988Sjohnlev #endif /* __i386 */ 1847843e1988Sjohnlev 1848843e1988Sjohnlev /* 1849843e1988Sjohnlev * Test to see if the instruction is part of _sys_rtt. 1850843e1988Sjohnlev * 1851843e1988Sjohnlev * Again on the hypervisor if we try to IRET to user land with a bad code 1852843e1988Sjohnlev * or stack selector we will get vectored through xen_failsafe_callback. 1853843e1988Sjohnlev * In which case we assume we got here via _sys_rtt since we only allow 1854843e1988Sjohnlev * IRET to user land to take place in _sys_rtt. 1855843e1988Sjohnlev */ 1856843e1988Sjohnlev static int 1857843e1988Sjohnlev instr_is_sys_rtt(caddr_t pc) 1858843e1988Sjohnlev { 1859843e1988Sjohnlev extern void _sys_rtt(), _sys_rtt_end(); 1860843e1988Sjohnlev 1861843e1988Sjohnlev if ((uintptr_t)pc < (uintptr_t)_sys_rtt || 1862843e1988Sjohnlev (uintptr_t)pc > (uintptr_t)_sys_rtt_end) 1863843e1988Sjohnlev return (0); 1864843e1988Sjohnlev 1865843e1988Sjohnlev return (1); 1866843e1988Sjohnlev } 1867843e1988Sjohnlev 1868843e1988Sjohnlev /* 18697c478bd9Sstevel@tonic-gate * Handle #gp faults in kernel mode. 18707c478bd9Sstevel@tonic-gate * 18717c478bd9Sstevel@tonic-gate * One legitimate way this can happen is if we attempt to update segment 18727c478bd9Sstevel@tonic-gate * registers to naughty values on the way out of the kernel. 18737c478bd9Sstevel@tonic-gate * 18747c478bd9Sstevel@tonic-gate * This can happen in a couple of ways: someone - either accidentally or 18757c478bd9Sstevel@tonic-gate * on purpose - creates (setcontext(2), lwp_create(2)) or modifies 18767c478bd9Sstevel@tonic-gate * (signal(2)) a ucontext that contains silly segment register values. 18777c478bd9Sstevel@tonic-gate * Or someone - either accidentally or on purpose - modifies the prgregset_t 18787c478bd9Sstevel@tonic-gate * of a subject process via /proc to contain silly segment register values. 18797c478bd9Sstevel@tonic-gate * 18807c478bd9Sstevel@tonic-gate * (The unfortunate part is that we can end up discovering the bad segment 18817c478bd9Sstevel@tonic-gate * register value in the middle of an 'iret' after we've popped most of the 18827c478bd9Sstevel@tonic-gate * stack. So it becomes quite difficult to associate an accurate ucontext 18837c478bd9Sstevel@tonic-gate * with the lwp, because the act of taking the #gp trap overwrites most of 18847c478bd9Sstevel@tonic-gate * what we were going to send the lwp.) 18857c478bd9Sstevel@tonic-gate * 18867c478bd9Sstevel@tonic-gate * OTOH if it turns out that's -not- the problem, and we're -not- an lwp 18877c478bd9Sstevel@tonic-gate * trying to return to user mode and we get a #gp fault, then we need 18887c478bd9Sstevel@tonic-gate * to die() -- which will happen if we return non-zero from this routine. 18897c478bd9Sstevel@tonic-gate */ 18907c478bd9Sstevel@tonic-gate static int 18917c478bd9Sstevel@tonic-gate kern_gpfault(struct regs *rp) 18927c478bd9Sstevel@tonic-gate { 18937c478bd9Sstevel@tonic-gate kthread_t *t = curthread; 18947c478bd9Sstevel@tonic-gate proc_t *p = ttoproc(t); 18957c478bd9Sstevel@tonic-gate klwp_t *lwp = ttolwp(t); 18967c478bd9Sstevel@tonic-gate struct regs tmpregs, *trp = NULL; 18977c478bd9Sstevel@tonic-gate caddr_t pc = (caddr_t)rp->r_pc; 18987c478bd9Sstevel@tonic-gate int v; 1899005d3febSMarek Pospisil uint32_t auditing = AU_AUDITING(); 19007c478bd9Sstevel@tonic-gate 19017c478bd9Sstevel@tonic-gate /* 1902843e1988Sjohnlev * if we're not an lwp, or in the case of running native the 1903843e1988Sjohnlev * pc range is outside _sys_rtt, then we should immediately 1904843e1988Sjohnlev * be die()ing horribly. 19057c478bd9Sstevel@tonic-gate */ 1906843e1988Sjohnlev if (lwp == NULL || !instr_is_sys_rtt(pc)) 19077c478bd9Sstevel@tonic-gate return (1); 19087c478bd9Sstevel@tonic-gate 19097c478bd9Sstevel@tonic-gate /* 19107c478bd9Sstevel@tonic-gate * So at least we're in the right part of the kernel. 19117c478bd9Sstevel@tonic-gate * 19127c478bd9Sstevel@tonic-gate * Disassemble the instruction at the faulting pc. 19137c478bd9Sstevel@tonic-gate * Once we know what it is, we carefully reconstruct the stack 19147c478bd9Sstevel@tonic-gate * based on the order in which the stack is deconstructed in 19157c478bd9Sstevel@tonic-gate * _sys_rtt. Ew. 19167c478bd9Sstevel@tonic-gate */ 1917843e1988Sjohnlev if (instr_is_iret(pc)) { 19187c478bd9Sstevel@tonic-gate /* 1919843e1988Sjohnlev * We took the #gp while trying to perform the IRET. 19207c478bd9Sstevel@tonic-gate * This means that either %cs or %ss are bad. 19217c478bd9Sstevel@tonic-gate * All we know for sure is that most of the general 19227c478bd9Sstevel@tonic-gate * registers have been restored, including the 19237c478bd9Sstevel@tonic-gate * segment registers, and all we have left on the 19247c478bd9Sstevel@tonic-gate * topmost part of the lwp's stack are the 19257c478bd9Sstevel@tonic-gate * registers that the iretq was unable to consume. 19267c478bd9Sstevel@tonic-gate * 19277c478bd9Sstevel@tonic-gate * All the rest of the state was crushed by the #gp 19287c478bd9Sstevel@tonic-gate * which pushed -its- registers atop our old save area 19297c478bd9Sstevel@tonic-gate * (because we had to decrement the stack pointer, sigh) so 19307c478bd9Sstevel@tonic-gate * all that we can try and do is to reconstruct the 19317c478bd9Sstevel@tonic-gate * crushed frame from the #gp trap frame itself. 19327c478bd9Sstevel@tonic-gate */ 19337c478bd9Sstevel@tonic-gate trp = &tmpregs; 19347c478bd9Sstevel@tonic-gate trp->r_ss = lwptoregs(lwp)->r_ss; 19357c478bd9Sstevel@tonic-gate trp->r_sp = lwptoregs(lwp)->r_sp; 19367c478bd9Sstevel@tonic-gate trp->r_ps = lwptoregs(lwp)->r_ps; 19377c478bd9Sstevel@tonic-gate trp->r_cs = lwptoregs(lwp)->r_cs; 19387c478bd9Sstevel@tonic-gate trp->r_pc = lwptoregs(lwp)->r_pc; 19397c478bd9Sstevel@tonic-gate bcopy(rp, trp, offsetof(struct regs, r_pc)); 19407c478bd9Sstevel@tonic-gate 19417c478bd9Sstevel@tonic-gate /* 19427c478bd9Sstevel@tonic-gate * Validate simple math 19437c478bd9Sstevel@tonic-gate */ 19447c478bd9Sstevel@tonic-gate ASSERT(trp->r_pc == lwptoregs(lwp)->r_pc); 19457c478bd9Sstevel@tonic-gate ASSERT(trp->r_err == rp->r_err); 19467c478bd9Sstevel@tonic-gate 1947843e1988Sjohnlev 1948843e1988Sjohnlev 1949843e1988Sjohnlev } 1950843e1988Sjohnlev 1951843e1988Sjohnlev #if defined(__amd64) 1952843e1988Sjohnlev if (trp == NULL && lwp->lwp_pcb.pcb_rupdate != 0) { 1953843e1988Sjohnlev 1954843e1988Sjohnlev /* 1955843e1988Sjohnlev * This is the common case -- we're trying to load 1956843e1988Sjohnlev * a bad segment register value in the only section 1957843e1988Sjohnlev * of kernel code that ever loads segment registers. 1958843e1988Sjohnlev * 1959843e1988Sjohnlev * We don't need to do anything at this point because 1960843e1988Sjohnlev * the pcb contains all the pending segment register 1961843e1988Sjohnlev * state, and the regs are still intact because we 1962843e1988Sjohnlev * didn't adjust the stack pointer yet. Given the fidelity 1963843e1988Sjohnlev * of all this, we could conceivably send a signal 1964843e1988Sjohnlev * to the lwp, rather than core-ing. 1965843e1988Sjohnlev */ 1966843e1988Sjohnlev trp = lwptoregs(lwp); 1967843e1988Sjohnlev ASSERT((caddr_t)trp == (caddr_t)rp->r_sp); 19687c478bd9Sstevel@tonic-gate } 19697c478bd9Sstevel@tonic-gate 19707c478bd9Sstevel@tonic-gate #elif defined(__i386) 19717c478bd9Sstevel@tonic-gate 1972843e1988Sjohnlev if (trp == NULL && instr_is_segregs_pop(pc)) 19737c478bd9Sstevel@tonic-gate trp = lwptoregs(lwp); 1974843e1988Sjohnlev 1975843e1988Sjohnlev #endif /* __i386 */ 19767c478bd9Sstevel@tonic-gate 19777c478bd9Sstevel@tonic-gate if (trp == NULL) 19787c478bd9Sstevel@tonic-gate return (1); 19797c478bd9Sstevel@tonic-gate 19807c478bd9Sstevel@tonic-gate /* 19817c478bd9Sstevel@tonic-gate * If we get to here, we're reasonably confident that we've 19827c478bd9Sstevel@tonic-gate * correctly decoded what happened on the way out of the kernel. 19837c478bd9Sstevel@tonic-gate * Rewrite the lwp's registers so that we can create a core dump 19847c478bd9Sstevel@tonic-gate * the (at least vaguely) represents the mcontext we were 19857c478bd9Sstevel@tonic-gate * being asked to restore when things went so terribly wrong. 19867c478bd9Sstevel@tonic-gate */ 19877c478bd9Sstevel@tonic-gate 19887c478bd9Sstevel@tonic-gate /* 19897c478bd9Sstevel@tonic-gate * Make sure that we have a meaningful %trapno and %err. 19907c478bd9Sstevel@tonic-gate */ 19917c478bd9Sstevel@tonic-gate trp->r_trapno = rp->r_trapno; 19927c478bd9Sstevel@tonic-gate trp->r_err = rp->r_err; 19937c478bd9Sstevel@tonic-gate 19947c478bd9Sstevel@tonic-gate if ((caddr_t)trp != (caddr_t)lwptoregs(lwp)) 19957c478bd9Sstevel@tonic-gate bcopy(trp, lwptoregs(lwp), sizeof (*trp)); 19967c478bd9Sstevel@tonic-gate 1997843e1988Sjohnlev 19987c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 19997c478bd9Sstevel@tonic-gate lwp->lwp_cursig = SIGSEGV; 20007c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 20017c478bd9Sstevel@tonic-gate 20027c478bd9Sstevel@tonic-gate /* 2003843e1988Sjohnlev * Terminate all LWPs but don't discard them. If another lwp beat 2004843e1988Sjohnlev * us to the punch by calling exit(), evaporate now. 20057c478bd9Sstevel@tonic-gate */ 200697eda132Sraf proc_is_exiting(p); 20077c478bd9Sstevel@tonic-gate if (exitlwps(1) != 0) { 20087c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 20097c478bd9Sstevel@tonic-gate lwp_exit(); 20107c478bd9Sstevel@tonic-gate } 20117c478bd9Sstevel@tonic-gate 2012005d3febSMarek Pospisil if (auditing) /* audit core dump */ 20137c478bd9Sstevel@tonic-gate audit_core_start(SIGSEGV); 20147c478bd9Sstevel@tonic-gate v = core(SIGSEGV, B_FALSE); 2015005d3febSMarek Pospisil if (auditing) /* audit core dump */ 20167c478bd9Sstevel@tonic-gate audit_core_finish(v ? CLD_KILLED : CLD_DUMPED); 20177c478bd9Sstevel@tonic-gate exit(v ? CLD_KILLED : CLD_DUMPED, SIGSEGV); 20187c478bd9Sstevel@tonic-gate return (0); 20197c478bd9Sstevel@tonic-gate } 20207c478bd9Sstevel@tonic-gate 20217c478bd9Sstevel@tonic-gate /* 20227c478bd9Sstevel@tonic-gate * dump_tss() - Display the TSS structure 20237c478bd9Sstevel@tonic-gate */ 20247c478bd9Sstevel@tonic-gate 2025843e1988Sjohnlev #if !defined(__xpv) 20267c478bd9Sstevel@tonic-gate #if defined(__amd64) 20277c478bd9Sstevel@tonic-gate 20287c478bd9Sstevel@tonic-gate static void 20297c478bd9Sstevel@tonic-gate dump_tss(void) 20307c478bd9Sstevel@tonic-gate { 20317c478bd9Sstevel@tonic-gate const char tss_fmt[] = "tss.%s:\t0x%p\n"; /* Format string */ 2032f16a0f4cSRobert Mustacchi tss_t *tss = CPU->cpu_tss; 20337c478bd9Sstevel@tonic-gate 20347c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_rsp0", (void *)tss->tss_rsp0); 20357c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_rsp1", (void *)tss->tss_rsp1); 20367c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_rsp2", (void *)tss->tss_rsp2); 20377c478bd9Sstevel@tonic-gate 20387c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist1", (void *)tss->tss_ist1); 20397c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist2", (void *)tss->tss_ist2); 20407c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist3", (void *)tss->tss_ist3); 20417c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist4", (void *)tss->tss_ist4); 20427c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist5", (void *)tss->tss_ist5); 20437c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist6", (void *)tss->tss_ist6); 20447c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist7", (void *)tss->tss_ist7); 20457c478bd9Sstevel@tonic-gate } 20467c478bd9Sstevel@tonic-gate 20477c478bd9Sstevel@tonic-gate #elif defined(__i386) 20487c478bd9Sstevel@tonic-gate 20497c478bd9Sstevel@tonic-gate static void 20507c478bd9Sstevel@tonic-gate dump_tss(void) 20517c478bd9Sstevel@tonic-gate { 20527c478bd9Sstevel@tonic-gate const char tss_fmt[] = "tss.%s:\t0x%p\n"; /* Format string */ 2053f16a0f4cSRobert Mustacchi tss_t *tss = CPU->cpu_tss; 20547c478bd9Sstevel@tonic-gate 20553dfcd6dcSdmick printf(tss_fmt, "tss_link", (void *)(uintptr_t)tss->tss_link); 20563dfcd6dcSdmick printf(tss_fmt, "tss_esp0", (void *)(uintptr_t)tss->tss_esp0); 20573dfcd6dcSdmick printf(tss_fmt, "tss_ss0", (void *)(uintptr_t)tss->tss_ss0); 20583dfcd6dcSdmick printf(tss_fmt, "tss_esp1", (void *)(uintptr_t)tss->tss_esp1); 20593dfcd6dcSdmick printf(tss_fmt, "tss_ss1", (void *)(uintptr_t)tss->tss_ss1); 20603dfcd6dcSdmick printf(tss_fmt, "tss_esp2", (void *)(uintptr_t)tss->tss_esp2); 20613dfcd6dcSdmick printf(tss_fmt, "tss_ss2", (void *)(uintptr_t)tss->tss_ss2); 20623dfcd6dcSdmick printf(tss_fmt, "tss_cr3", (void *)(uintptr_t)tss->tss_cr3); 20633dfcd6dcSdmick printf(tss_fmt, "tss_eip", (void *)(uintptr_t)tss->tss_eip); 20643dfcd6dcSdmick printf(tss_fmt, "tss_eflags", (void *)(uintptr_t)tss->tss_eflags); 20653dfcd6dcSdmick printf(tss_fmt, "tss_eax", (void *)(uintptr_t)tss->tss_eax); 20663dfcd6dcSdmick printf(tss_fmt, "tss_ebx", (void *)(uintptr_t)tss->tss_ebx); 20673dfcd6dcSdmick printf(tss_fmt, "tss_ecx", (void *)(uintptr_t)tss->tss_ecx); 20683dfcd6dcSdmick printf(tss_fmt, "tss_edx", (void *)(uintptr_t)tss->tss_edx); 20693dfcd6dcSdmick printf(tss_fmt, "tss_esp", (void *)(uintptr_t)tss->tss_esp); 20707c478bd9Sstevel@tonic-gate } 20717c478bd9Sstevel@tonic-gate 20727c478bd9Sstevel@tonic-gate #endif /* __amd64 */ 2073843e1988Sjohnlev #endif /* !__xpv */ 20747c478bd9Sstevel@tonic-gate 20757c478bd9Sstevel@tonic-gate #if defined(TRAPTRACE) 20767c478bd9Sstevel@tonic-gate 2077843e1988Sjohnlev int ttrace_nrec = 10; /* number of records to dump out */ 2078843e1988Sjohnlev int ttrace_dump_nregs = 0; /* dump out this many records with regs too */ 20797c478bd9Sstevel@tonic-gate 20807c478bd9Sstevel@tonic-gate /* 20817c478bd9Sstevel@tonic-gate * Dump out the last ttrace_nrec traptrace records on each CPU 20827c478bd9Sstevel@tonic-gate */ 20837c478bd9Sstevel@tonic-gate static void 20847c478bd9Sstevel@tonic-gate dump_ttrace(void) 20857c478bd9Sstevel@tonic-gate { 20867c478bd9Sstevel@tonic-gate trap_trace_ctl_t *ttc; 20877c478bd9Sstevel@tonic-gate trap_trace_rec_t *rec; 20887c478bd9Sstevel@tonic-gate uintptr_t current; 20897c478bd9Sstevel@tonic-gate int i, j, k; 20907c478bd9Sstevel@tonic-gate int n = NCPU; 20917c478bd9Sstevel@tonic-gate #if defined(__amd64) 20927c478bd9Sstevel@tonic-gate const char banner[] = 2093*905e0868SYuri Pankov "CPU ADDRESS TIMESTAMP TYPE VC HANDLER PC\n"; 2094*905e0868SYuri Pankov /* Define format for the CPU, ADDRESS, and TIMESTAMP fields */ 20957c478bd9Sstevel@tonic-gate const char fmt1[] = "%3d %016lx %12llx"; 2096*905e0868SYuri Pankov char data1[34]; /* length of string formatted by fmt1 + 1 */ 20977c478bd9Sstevel@tonic-gate #elif defined(__i386) 20987c478bd9Sstevel@tonic-gate const char banner[] = 2099*905e0868SYuri Pankov "CPU ADDRESS TIMESTAMP TYPE VC HANDLER PC\n"; 2100*905e0868SYuri Pankov /* Define format for the CPU, ADDRESS, and TIMESTAMP fields */ 21017c478bd9Sstevel@tonic-gate const char fmt1[] = "%3d %08lx %12llx"; 2102*905e0868SYuri Pankov char data1[26]; /* length of string formatted by fmt1 + 1 */ 21037c478bd9Sstevel@tonic-gate #endif 2104*905e0868SYuri Pankov /* Define format for the TYPE and VC fields */ 21057c478bd9Sstevel@tonic-gate const char fmt2[] = "%4s %3x"; 2106*905e0868SYuri Pankov char data2[9]; /* length of string formatted by fmt2 + 1 */ 2107*905e0868SYuri Pankov /* 2108*905e0868SYuri Pankov * Define format for the HANDLER field. Width is arbitrary, but should 2109*905e0868SYuri Pankov * be enough for common handler's names, and leave enough space for 2110*905e0868SYuri Pankov * the PC field, especially when we are in kmdb. 2111*905e0868SYuri Pankov */ 2112*905e0868SYuri Pankov const char fmt3h[] = "#%-15s"; 2113*905e0868SYuri Pankov const char fmt3p[] = "%-16p"; 2114*905e0868SYuri Pankov const char fmt3s[] = "%-16s"; 2115*905e0868SYuri Pankov char data3[17]; /* length of string formatted by fmt3* + 1 */ 21167c478bd9Sstevel@tonic-gate 21177c478bd9Sstevel@tonic-gate if (ttrace_nrec == 0) 21187c478bd9Sstevel@tonic-gate return; 21197c478bd9Sstevel@tonic-gate 2120*905e0868SYuri Pankov printf("\n"); 21217c478bd9Sstevel@tonic-gate printf(banner); 21227c478bd9Sstevel@tonic-gate 21237c478bd9Sstevel@tonic-gate for (i = 0; i < n; i++) { 21247c478bd9Sstevel@tonic-gate ttc = &trap_trace_ctl[i]; 21257c478bd9Sstevel@tonic-gate if (ttc->ttc_first == NULL) 21267c478bd9Sstevel@tonic-gate continue; 21277c478bd9Sstevel@tonic-gate 21287c478bd9Sstevel@tonic-gate current = ttc->ttc_next - sizeof (trap_trace_rec_t); 21297c478bd9Sstevel@tonic-gate for (j = 0; j < ttrace_nrec; j++) { 21307c478bd9Sstevel@tonic-gate struct sysent *sys; 21317c478bd9Sstevel@tonic-gate struct autovec *vec; 21327c478bd9Sstevel@tonic-gate extern struct av_head autovect[]; 21337c478bd9Sstevel@tonic-gate int type; 21347c478bd9Sstevel@tonic-gate ulong_t off; 21357c478bd9Sstevel@tonic-gate char *sym, *stype; 21367c478bd9Sstevel@tonic-gate 21377c478bd9Sstevel@tonic-gate if (current < ttc->ttc_first) 21387c478bd9Sstevel@tonic-gate current = 21397c478bd9Sstevel@tonic-gate ttc->ttc_limit - sizeof (trap_trace_rec_t); 21407c478bd9Sstevel@tonic-gate 21417c478bd9Sstevel@tonic-gate if (current == NULL) 21427c478bd9Sstevel@tonic-gate continue; 21437c478bd9Sstevel@tonic-gate 21447c478bd9Sstevel@tonic-gate rec = (trap_trace_rec_t *)current; 21457c478bd9Sstevel@tonic-gate 21467c478bd9Sstevel@tonic-gate if (rec->ttr_stamp == 0) 21477c478bd9Sstevel@tonic-gate break; 21487c478bd9Sstevel@tonic-gate 2149*905e0868SYuri Pankov (void) snprintf(data1, sizeof (data1), fmt1, i, 2150*905e0868SYuri Pankov (uintptr_t)rec, rec->ttr_stamp); 21517c478bd9Sstevel@tonic-gate 21527c478bd9Sstevel@tonic-gate switch (rec->ttr_marker) { 21537c478bd9Sstevel@tonic-gate case TT_SYSCALL: 21547c478bd9Sstevel@tonic-gate case TT_SYSENTER: 21557c478bd9Sstevel@tonic-gate case TT_SYSC: 21567c478bd9Sstevel@tonic-gate case TT_SYSC64: 21577c478bd9Sstevel@tonic-gate #if defined(__amd64) 21587c478bd9Sstevel@tonic-gate sys = &sysent32[rec->ttr_sysnum]; 21597c478bd9Sstevel@tonic-gate switch (rec->ttr_marker) { 21607c478bd9Sstevel@tonic-gate case TT_SYSC64: 21617c478bd9Sstevel@tonic-gate sys = &sysent[rec->ttr_sysnum]; 21627c478bd9Sstevel@tonic-gate /*FALLTHROUGH*/ 21637c478bd9Sstevel@tonic-gate #elif defined(__i386) 21647c478bd9Sstevel@tonic-gate sys = &sysent[rec->ttr_sysnum]; 21657c478bd9Sstevel@tonic-gate switch (rec->ttr_marker) { 21667c478bd9Sstevel@tonic-gate case TT_SYSC64: 21677c478bd9Sstevel@tonic-gate #endif 21687c478bd9Sstevel@tonic-gate case TT_SYSC: 21697c478bd9Sstevel@tonic-gate stype = "sysc"; /* syscall */ 21707c478bd9Sstevel@tonic-gate break; 21717c478bd9Sstevel@tonic-gate case TT_SYSCALL: 21727c478bd9Sstevel@tonic-gate stype = "lcal"; /* lcall */ 21737c478bd9Sstevel@tonic-gate break; 21747c478bd9Sstevel@tonic-gate case TT_SYSENTER: 21757c478bd9Sstevel@tonic-gate stype = "syse"; /* sysenter */ 21767c478bd9Sstevel@tonic-gate break; 21777c478bd9Sstevel@tonic-gate default: 21787c478bd9Sstevel@tonic-gate break; 21797c478bd9Sstevel@tonic-gate } 2180*905e0868SYuri Pankov (void) snprintf(data2, sizeof (data2), fmt2, 2181*905e0868SYuri Pankov stype, rec->ttr_sysnum); 21827c478bd9Sstevel@tonic-gate if (sys != NULL) { 21837c478bd9Sstevel@tonic-gate sym = kobj_getsymname( 21847c478bd9Sstevel@tonic-gate (uintptr_t)sys->sy_callc, 21857c478bd9Sstevel@tonic-gate &off); 2186*905e0868SYuri Pankov if (sym != NULL) { 2187*905e0868SYuri Pankov (void) snprintf(data3, 2188*905e0868SYuri Pankov sizeof (data3), fmt3s, sym); 21897c478bd9Sstevel@tonic-gate } else { 2190*905e0868SYuri Pankov (void) snprintf(data3, 2191*905e0868SYuri Pankov sizeof (data3), fmt3p, 2192*905e0868SYuri Pankov sys->sy_callc); 2193*905e0868SYuri Pankov } 2194*905e0868SYuri Pankov } else { 2195*905e0868SYuri Pankov (void) snprintf(data3, sizeof (data3), 2196*905e0868SYuri Pankov fmt3s, "unknown"); 21977c478bd9Sstevel@tonic-gate } 21987c478bd9Sstevel@tonic-gate break; 21997c478bd9Sstevel@tonic-gate 22007c478bd9Sstevel@tonic-gate case TT_INTERRUPT: 2201*905e0868SYuri Pankov (void) snprintf(data2, sizeof (data2), fmt2, 2202*905e0868SYuri Pankov "intr", rec->ttr_vector); 22037ff178cdSJimmy Vetayases if (get_intr_handler != NULL) 22047ff178cdSJimmy Vetayases vec = (struct autovec *) 22057ff178cdSJimmy Vetayases (*get_intr_handler) 22067ff178cdSJimmy Vetayases (rec->ttr_cpuid, rec->ttr_vector); 22077ff178cdSJimmy Vetayases else 22087ff178cdSJimmy Vetayases vec = 22097ff178cdSJimmy Vetayases autovect[rec->ttr_vector].avh_link; 22107ff178cdSJimmy Vetayases 22117c478bd9Sstevel@tonic-gate if (vec != NULL) { 22127c478bd9Sstevel@tonic-gate sym = kobj_getsymname( 22137c478bd9Sstevel@tonic-gate (uintptr_t)vec->av_vector, &off); 2214*905e0868SYuri Pankov if (sym != NULL) { 2215*905e0868SYuri Pankov (void) snprintf(data3, 2216*905e0868SYuri Pankov sizeof (data3), fmt3s, sym); 22177c478bd9Sstevel@tonic-gate } else { 2218*905e0868SYuri Pankov (void) snprintf(data3, 2219*905e0868SYuri Pankov sizeof (data3), fmt3p, 2220*905e0868SYuri Pankov vec->av_vector); 2221*905e0868SYuri Pankov } 2222*905e0868SYuri Pankov } else { 2223*905e0868SYuri Pankov (void) snprintf(data3, sizeof (data3), 2224*905e0868SYuri Pankov fmt3s, "unknown"); 22257c478bd9Sstevel@tonic-gate } 22267c478bd9Sstevel@tonic-gate break; 22277c478bd9Sstevel@tonic-gate 22287c478bd9Sstevel@tonic-gate case TT_TRAP: 2229ae115bc7Smrj case TT_EVENT: 22307c478bd9Sstevel@tonic-gate type = rec->ttr_regs.r_trapno; 2231*905e0868SYuri Pankov (void) snprintf(data2, sizeof (data2), fmt2, 2232*905e0868SYuri Pankov "trap", type); 2233*905e0868SYuri Pankov if (type < TRAP_TYPES) { 2234*905e0868SYuri Pankov (void) snprintf(data3, sizeof (data3), 2235*905e0868SYuri Pankov fmt3h, trap_type_mnemonic[type]); 2236*905e0868SYuri Pankov } else { 2237ae115bc7Smrj switch (type) { 2238ae115bc7Smrj case T_AST: 2239*905e0868SYuri Pankov (void) snprintf(data3, 2240*905e0868SYuri Pankov sizeof (data3), fmt3s, 2241*905e0868SYuri Pankov "ast"); 2242ae115bc7Smrj break; 2243ae115bc7Smrj default: 2244*905e0868SYuri Pankov (void) snprintf(data3, 2245*905e0868SYuri Pankov sizeof (data3), fmt3s, ""); 2246ae115bc7Smrj break; 2247ae115bc7Smrj } 2248*905e0868SYuri Pankov } 2249ae115bc7Smrj break; 2250ae115bc7Smrj 22517c478bd9Sstevel@tonic-gate default: 22527c478bd9Sstevel@tonic-gate break; 22537c478bd9Sstevel@tonic-gate } 22547c478bd9Sstevel@tonic-gate 22557c478bd9Sstevel@tonic-gate sym = kobj_getsymname(rec->ttr_regs.r_pc, &off); 2256*905e0868SYuri Pankov if (sym != NULL) { 2257*905e0868SYuri Pankov printf("%s %s %s %s+%lx\n", data1, data2, data3, 2258*905e0868SYuri Pankov sym, off); 2259*905e0868SYuri Pankov } else { 2260*905e0868SYuri Pankov printf("%s %s %s %lx\n", data1, data2, data3, 2261*905e0868SYuri Pankov rec->ttr_regs.r_pc); 2262*905e0868SYuri Pankov } 22637c478bd9Sstevel@tonic-gate 22647c478bd9Sstevel@tonic-gate if (ttrace_dump_nregs-- > 0) { 22657c478bd9Sstevel@tonic-gate int s; 22667c478bd9Sstevel@tonic-gate 22677c478bd9Sstevel@tonic-gate if (rec->ttr_marker == TT_INTERRUPT) 22687c478bd9Sstevel@tonic-gate printf( 22697c478bd9Sstevel@tonic-gate "\t\tipl %x spl %x pri %x\n", 22707c478bd9Sstevel@tonic-gate rec->ttr_ipl, 22717c478bd9Sstevel@tonic-gate rec->ttr_spl, 22727c478bd9Sstevel@tonic-gate rec->ttr_pri); 22737c478bd9Sstevel@tonic-gate 22747c478bd9Sstevel@tonic-gate dumpregs(&rec->ttr_regs); 22757c478bd9Sstevel@tonic-gate 22767c478bd9Sstevel@tonic-gate printf("\t%3s: %p\n\n", " ct", 22777c478bd9Sstevel@tonic-gate (void *)rec->ttr_curthread); 22787c478bd9Sstevel@tonic-gate 22797c478bd9Sstevel@tonic-gate /* 22807c478bd9Sstevel@tonic-gate * print out the pc stack that we recorded 22817c478bd9Sstevel@tonic-gate * at trap time (if any) 22827c478bd9Sstevel@tonic-gate */ 22837c478bd9Sstevel@tonic-gate for (s = 0; s < rec->ttr_sdepth; s++) { 22847c478bd9Sstevel@tonic-gate uintptr_t fullpc; 22857c478bd9Sstevel@tonic-gate 22867c478bd9Sstevel@tonic-gate if (s >= TTR_STACK_DEPTH) { 22877c478bd9Sstevel@tonic-gate printf("ttr_sdepth corrupt\n"); 22887c478bd9Sstevel@tonic-gate break; 22897c478bd9Sstevel@tonic-gate } 22907c478bd9Sstevel@tonic-gate 22917c478bd9Sstevel@tonic-gate fullpc = (uintptr_t)rec->ttr_stack[s]; 22927c478bd9Sstevel@tonic-gate 22937c478bd9Sstevel@tonic-gate sym = kobj_getsymname(fullpc, &off); 22947c478bd9Sstevel@tonic-gate if (sym != NULL) 22957c478bd9Sstevel@tonic-gate printf("-> %s+0x%lx()\n", 22967c478bd9Sstevel@tonic-gate sym, off); 22977c478bd9Sstevel@tonic-gate else 22987c478bd9Sstevel@tonic-gate printf("-> 0x%lx()\n", fullpc); 22997c478bd9Sstevel@tonic-gate } 23007c478bd9Sstevel@tonic-gate printf("\n"); 23017c478bd9Sstevel@tonic-gate } 23027c478bd9Sstevel@tonic-gate current -= sizeof (trap_trace_rec_t); 23037c478bd9Sstevel@tonic-gate } 23047c478bd9Sstevel@tonic-gate } 23057c478bd9Sstevel@tonic-gate } 23067c478bd9Sstevel@tonic-gate 23077c478bd9Sstevel@tonic-gate #endif /* TRAPTRACE */ 23087c478bd9Sstevel@tonic-gate 23097c478bd9Sstevel@tonic-gate void 2310843e1988Sjohnlev panic_showtrap(struct panic_trap_info *tip) 23117c478bd9Sstevel@tonic-gate { 23127c478bd9Sstevel@tonic-gate showregs(tip->trap_type, tip->trap_regs, tip->trap_addr); 23137c478bd9Sstevel@tonic-gate 23147c478bd9Sstevel@tonic-gate #if defined(TRAPTRACE) 23157c478bd9Sstevel@tonic-gate dump_ttrace(); 2316843e1988Sjohnlev #endif 23177c478bd9Sstevel@tonic-gate 2318843e1988Sjohnlev #if !defined(__xpv) 23197c478bd9Sstevel@tonic-gate if (tip->trap_type == T_DBLFLT) 23207c478bd9Sstevel@tonic-gate dump_tss(); 2321843e1988Sjohnlev #endif 23227c478bd9Sstevel@tonic-gate } 23237c478bd9Sstevel@tonic-gate 23247c478bd9Sstevel@tonic-gate void 2325843e1988Sjohnlev panic_savetrap(panic_data_t *pdp, struct panic_trap_info *tip) 23267c478bd9Sstevel@tonic-gate { 23277c478bd9Sstevel@tonic-gate panic_saveregs(pdp, tip->trap_regs); 23287c478bd9Sstevel@tonic-gate } 2329