1ea0fabbcSTim J. Robbins /*- 2c49761ddSPedro F. Giffuni * SPDX-License-Identifier: BSD-3-Clause 3c49761ddSPedro F. Giffuni * 4ea0fabbcSTim J. Robbins * Copyright (c) 2004 Tim J. Robbins 5ea0fabbcSTim J. Robbins * Copyright (c) 2003 Peter Wemm 6ea0fabbcSTim J. Robbins * Copyright (c) 2002 Doug Rabson 7ea0fabbcSTim J. Robbins * Copyright (c) 1998-1999 Andrew Gallatin 89a14aa01SUlrich Spörlein * Copyright (c) 1994-1996 Søren Schmidt 9ea0fabbcSTim J. Robbins * All rights reserved. 10ea0fabbcSTim J. Robbins * 11ea0fabbcSTim J. Robbins * Redistribution and use in source and binary forms, with or without 12ea0fabbcSTim J. Robbins * modification, are permitted provided that the following conditions 13ea0fabbcSTim J. Robbins * are met: 14ea0fabbcSTim J. Robbins * 1. Redistributions of source code must retain the above copyright 15ea0fabbcSTim J. Robbins * notice, this list of conditions and the following disclaimer 16ea0fabbcSTim J. Robbins * in this position and unchanged. 17ea0fabbcSTim J. Robbins * 2. Redistributions in binary form must reproduce the above copyright 18ea0fabbcSTim J. Robbins * notice, this list of conditions and the following disclaimer in the 19ea0fabbcSTim J. Robbins * documentation and/or other materials provided with the distribution. 20ea0fabbcSTim J. Robbins * 3. The name of the author may not be used to endorse or promote products 21ea0fabbcSTim J. Robbins * derived from this software without specific prior written permission 22ea0fabbcSTim J. Robbins * 23ea0fabbcSTim J. Robbins * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24ea0fabbcSTim J. Robbins * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25ea0fabbcSTim J. Robbins * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26ea0fabbcSTim J. Robbins * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27ea0fabbcSTim J. Robbins * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28ea0fabbcSTim J. Robbins * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29ea0fabbcSTim J. Robbins * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30ea0fabbcSTim J. Robbins * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31ea0fabbcSTim J. Robbins * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32ea0fabbcSTim J. Robbins * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33ea0fabbcSTim J. Robbins */ 34ea0fabbcSTim J. Robbins 3502bf7e5eSTijl Coosemans #include "opt_compat.h" 3602bf7e5eSTijl Coosemans 37ea0fabbcSTim J. Robbins #include <sys/cdefs.h> 38ea0fabbcSTim J. Robbins __FBSDID("$FreeBSD$"); 39ea0fabbcSTim J. Robbins 40841c0c7eSNathan Whitehorn #ifndef COMPAT_FREEBSD32 41841c0c7eSNathan Whitehorn #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!" 42ea0fabbcSTim J. Robbins #endif 43ea0fabbcSTim J. Robbins 44ea0fabbcSTim J. Robbins #define __ELF_WORD_SIZE 32 45ea0fabbcSTim J. Robbins 46ea0fabbcSTim J. Robbins #include <sys/param.h> 47ea0fabbcSTim J. Robbins #include <sys/systm.h> 48ea0fabbcSTim J. Robbins #include <sys/exec.h> 4948b05c3fSKonstantin Belousov #include <sys/fcntl.h> 50ea0fabbcSTim J. Robbins #include <sys/imgact.h> 51ea0fabbcSTim J. Robbins #include <sys/imgact_elf.h> 52ea0fabbcSTim J. Robbins #include <sys/kernel.h> 53ea0fabbcSTim J. Robbins #include <sys/lock.h> 54ea0fabbcSTim J. Robbins #include <sys/malloc.h> 55ea0fabbcSTim J. Robbins #include <sys/module.h> 56ea0fabbcSTim J. Robbins #include <sys/mutex.h> 57ea0fabbcSTim J. Robbins #include <sys/proc.h> 586004362eSDavid Schultz #include <sys/resourcevar.h> 599931033bSDmitry Chagin #include <sys/stddef.h> 60ea0fabbcSTim J. Robbins #include <sys/signalvar.h> 61ea0fabbcSTim J. Robbins #include <sys/syscallsubr.h> 62c0aa0e2cSEd Maste #include <sys/sysctl.h> 63ea0fabbcSTim J. Robbins #include <sys/sysent.h> 64ea0fabbcSTim J. Robbins #include <sys/sysproto.h> 65ea0fabbcSTim J. Robbins #include <sys/vnode.h> 667c09e6c0SAlexander Leidinger #include <sys/eventhandler.h> 67ea0fabbcSTim J. Robbins 68ea0fabbcSTim J. Robbins #include <vm/vm.h> 69ea0fabbcSTim J. Robbins #include <vm/pmap.h> 70ea0fabbcSTim J. Robbins #include <vm/vm_extern.h> 71ea0fabbcSTim J. Robbins #include <vm/vm_map.h> 72ea0fabbcSTim J. Robbins #include <vm/vm_object.h> 73ea0fabbcSTim J. Robbins #include <vm/vm_page.h> 74ea0fabbcSTim J. Robbins #include <vm/vm_param.h> 75ea0fabbcSTim J. Robbins 76ea0fabbcSTim J. Robbins #include <machine/cpu.h> 77ea0fabbcSTim J. Robbins #include <machine/md_var.h> 786004362eSDavid Schultz #include <machine/pcb.h> 79ea0fabbcSTim J. Robbins #include <machine/specialreg.h> 80d41e41f9SJohn Baldwin #include <machine/trap.h> 81ea0fabbcSTim J. Robbins 829931033bSDmitry Chagin #include <x86/linux/linux_x86.h> 83ea0fabbcSTim J. Robbins #include <amd64/linux32/linux.h> 84ea0fabbcSTim J. Robbins #include <amd64/linux32/linux32_proto.h> 857c09e6c0SAlexander Leidinger #include <compat/linux/linux_emul.h> 860a4b664aSDmitry Chagin #include <compat/linux/linux_fork.h> 87d825ce0aSJohn Baldwin #include <compat/linux/linux_ioctl.h> 88ea0fabbcSTim J. Robbins #include <compat/linux/linux_mib.h> 894d7c2e8aSDmitry Chagin #include <compat/linux/linux_misc.h> 90ea0fabbcSTim J. Robbins #include <compat/linux/linux_signal.h> 91ea0fabbcSTim J. Robbins #include <compat/linux/linux_util.h> 92bdc37934SDmitry Chagin #include <compat/linux/linux_vdso.h> 93ea0fabbcSTim J. Robbins 94ea0fabbcSTim J. Robbins MODULE_VERSION(linux, 1); 95ea0fabbcSTim J. Robbins 964aae1334SDmitry Chagin #define LINUX32_MAXUSER ((1ul << 32) - PAGE_SIZE) 979931033bSDmitry Chagin #define LINUX32_VDSOPAGE_SIZE PAGE_SIZE * 2 989931033bSDmitry Chagin #define LINUX32_VDSOPAGE (LINUX32_MAXUSER - LINUX32_VDSOPAGE_SIZE) 999931033bSDmitry Chagin #define LINUX32_SHAREDPAGE (LINUX32_VDSOPAGE - PAGE_SIZE) 1009931033bSDmitry Chagin /* 1019931033bSDmitry Chagin * PAGE_SIZE - the size 1029931033bSDmitry Chagin * of the native SHAREDPAGE 1039931033bSDmitry Chagin */ 1044aae1334SDmitry Chagin #define LINUX32_USRSTACK LINUX32_SHAREDPAGE 1054aae1334SDmitry Chagin 106bdc37934SDmitry Chagin static int linux_szsigcode; 1079931033bSDmitry Chagin static vm_object_t linux_vdso_obj; 1089931033bSDmitry Chagin static char *linux_vdso_mapping; 1099931033bSDmitry Chagin extern char _binary_linux32_vdso_so_o_start; 1109931033bSDmitry Chagin extern char _binary_linux32_vdso_so_o_end; 1119931033bSDmitry Chagin static vm_offset_t linux_vdso_base; 112ea0fabbcSTim J. Robbins 1132f99bcceSJohn Baldwin extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL]; 114ea0fabbcSTim J. Robbins 115ea0fabbcSTim J. Robbins SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 116ea0fabbcSTim J. Robbins 11731174518SJohn Baldwin static int linux_fixup_elf(uintptr_t *stack_base, 118ea0fabbcSTim J. Robbins struct image_params *iparams); 11903b0d68cSJohn Baldwin static int linux_copyout_strings(struct image_params *imgp, 12031174518SJohn Baldwin uintptr_t *stack_base); 1219104847fSDavid Xu static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 122dc858467SEd Maste static void linux_exec_setregs(struct thread *td, 12331174518SJohn Baldwin struct image_params *imgp, uintptr_t stack); 1249931033bSDmitry Chagin static void linux_exec_sysvec_init(void *param); 1255fd9cd53SDmitry Chagin static int linux_on_exec_vmspace(struct proc *p, 1265fd9cd53SDmitry Chagin struct image_params *imgp); 12719059a13SJohn Baldwin static void linux32_fixlimit(struct rlimit *rl, int which); 128a95659f7SEd Maste static bool linux32_trans_osrel(const Elf_Note *note, int32_t *osrel); 129a543556cSDmitry Chagin static void linux_vdso_install(const void *param); 130a543556cSDmitry Chagin static void linux_vdso_deinstall(const void *param); 1319931033bSDmitry Chagin static void linux_vdso_reloc(char *mapping, Elf_Addr offset); 132de8374dfSDmitry Chagin static void linux32_set_fork_retval(struct thread *td); 133c26391f4SEdward Tomasz Napierala static void linux32_set_syscall_retval(struct thread *td, int error); 134ea0fabbcSTim J. Robbins 135ea0fabbcSTim J. Robbins #define LINUX_T_UNKNOWN 255 136ea0fabbcSTim J. Robbins static int _bsd_to_linux_trapcode[] = { 137ea0fabbcSTim J. Robbins LINUX_T_UNKNOWN, /* 0 */ 138ea0fabbcSTim J. Robbins 6, /* 1 T_PRIVINFLT */ 139ea0fabbcSTim J. Robbins LINUX_T_UNKNOWN, /* 2 */ 140ea0fabbcSTim J. Robbins 3, /* 3 T_BPTFLT */ 141ea0fabbcSTim J. Robbins LINUX_T_UNKNOWN, /* 4 */ 142ea0fabbcSTim J. Robbins LINUX_T_UNKNOWN, /* 5 */ 143ea0fabbcSTim J. Robbins 16, /* 6 T_ARITHTRAP */ 144ea0fabbcSTim J. Robbins 254, /* 7 T_ASTFLT */ 145ea0fabbcSTim J. Robbins LINUX_T_UNKNOWN, /* 8 */ 146ea0fabbcSTim J. Robbins 13, /* 9 T_PROTFLT */ 147ea0fabbcSTim J. Robbins 1, /* 10 T_TRCTRAP */ 148ea0fabbcSTim J. Robbins LINUX_T_UNKNOWN, /* 11 */ 149ea0fabbcSTim J. Robbins 14, /* 12 T_PAGEFLT */ 150ea0fabbcSTim J. Robbins LINUX_T_UNKNOWN, /* 13 */ 151ea0fabbcSTim J. Robbins 17, /* 14 T_ALIGNFLT */ 152ea0fabbcSTim J. Robbins LINUX_T_UNKNOWN, /* 15 */ 153ea0fabbcSTim J. Robbins LINUX_T_UNKNOWN, /* 16 */ 154ea0fabbcSTim J. Robbins LINUX_T_UNKNOWN, /* 17 */ 155ea0fabbcSTim J. Robbins 0, /* 18 T_DIVIDE */ 156ea0fabbcSTim J. Robbins 2, /* 19 T_NMI */ 157ea0fabbcSTim J. Robbins 4, /* 20 T_OFLOW */ 158ea0fabbcSTim J. Robbins 5, /* 21 T_BOUND */ 159ea0fabbcSTim J. Robbins 7, /* 22 T_DNA */ 160ea0fabbcSTim J. Robbins 8, /* 23 T_DOUBLEFLT */ 161ea0fabbcSTim J. Robbins 9, /* 24 T_FPOPFLT */ 162ea0fabbcSTim J. Robbins 10, /* 25 T_TSSFLT */ 163ea0fabbcSTim J. Robbins 11, /* 26 T_SEGNPFLT */ 164ea0fabbcSTim J. Robbins 12, /* 27 T_STKFLT */ 165ea0fabbcSTim J. Robbins 18, /* 28 T_MCHK */ 166ea0fabbcSTim J. Robbins 19, /* 29 T_XMMFLT */ 167ea0fabbcSTim J. Robbins 15 /* 30 T_RESERVED */ 168ea0fabbcSTim J. Robbins }; 169ea0fabbcSTim J. Robbins #define bsd_to_linux_trapcode(code) \ 170ea24b056SPedro F. Giffuni ((code)<nitems(_bsd_to_linux_trapcode)? \ 171ea0fabbcSTim J. Robbins _bsd_to_linux_trapcode[(code)]: \ 172ea0fabbcSTim J. Robbins LINUX_T_UNKNOWN) 173ea0fabbcSTim J. Robbins 174ea0fabbcSTim J. Robbins struct linux32_ps_strings { 175ea0fabbcSTim J. Robbins u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 176f2c7668eSDavid Schultz u_int ps_nargvstr; /* the number of argument strings */ 177ea0fabbcSTim J. Robbins u_int32_t ps_envstr; /* first of 0 or more environment strings */ 178f2c7668eSDavid Schultz u_int ps_nenvstr; /* the number of environment strings */ 179ea0fabbcSTim J. Robbins }; 1804aae1334SDmitry Chagin #define LINUX32_PS_STRINGS (LINUX32_USRSTACK - \ 1814aae1334SDmitry Chagin sizeof(struct linux32_ps_strings)) 182ea0fabbcSTim J. Robbins 1839931033bSDmitry Chagin LINUX_VDSO_SYM_INTPTR(__kernel_vsyscall); 1849931033bSDmitry Chagin LINUX_VDSO_SYM_INTPTR(__kernel_sigreturn); 1859931033bSDmitry Chagin LINUX_VDSO_SYM_INTPTR(__kernel_rt_sigreturn); 1869931033bSDmitry Chagin LINUX_VDSO_SYM_INTPTR(kern_timekeep_base); 1879931033bSDmitry Chagin LINUX_VDSO_SYM_INTPTR(kern_tsc_selector); 188*5a6a4fb2SDmitry Chagin LINUX_VDSO_SYM_INTPTR(kern_cpu_selector); 1890020bdf1SDmitry Chagin LINUX_VDSO_SYM_CHAR(linux_platform); 190bdc37934SDmitry Chagin 191ea0fabbcSTim J. Robbins /* 192ea0fabbcSTim J. Robbins * If FreeBSD & Linux have a difference of opinion about what a trap 193ea0fabbcSTim J. Robbins * means, deal with it here. 194ea0fabbcSTim J. Robbins * 195ea0fabbcSTim J. Robbins * MPSAFE 196ea0fabbcSTim J. Robbins */ 197ea0fabbcSTim J. Robbins static int 198dc858467SEd Maste linux_translate_traps(int signal, int trap_code) 199ea0fabbcSTim J. Robbins { 200ea0fabbcSTim J. Robbins if (signal != SIGBUS) 201ad448975SEd Maste return (signal); 202ea0fabbcSTim J. Robbins switch (trap_code) { 203ea0fabbcSTim J. Robbins case T_PROTFLT: 204ea0fabbcSTim J. Robbins case T_TSSFLT: 205ea0fabbcSTim J. Robbins case T_DOUBLEFLT: 206ea0fabbcSTim J. Robbins case T_PAGEFLT: 207ad448975SEd Maste return (SIGSEGV); 208ea0fabbcSTim J. Robbins default: 209ad448975SEd Maste return (signal); 210ea0fabbcSTim J. Robbins } 211ea0fabbcSTim J. Robbins } 212ea0fabbcSTim J. Robbins 21303b0d68cSJohn Baldwin static int 214d8010b11SJohn Baldwin linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) 215ea0fabbcSTim J. Robbins { 216ea0fabbcSTim J. Robbins Elf32_Auxargs *args; 2175f77b8a8SBrooks Davis Elf32_Auxinfo *argarray, *pos; 21803b0d68cSJohn Baldwin int error, issetugid; 2194d7c2e8aSDmitry Chagin 220ea0fabbcSTim J. Robbins args = (Elf32_Auxargs *)imgp->auxargs; 2215f77b8a8SBrooks Davis argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 2225f77b8a8SBrooks Davis M_WAITOK | M_ZERO); 223ea0fabbcSTim J. Robbins 224669414e4SXin LI issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 2259931033bSDmitry Chagin AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall); 2269931033bSDmitry Chagin AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base); 2275f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 228ca6e1fa3SEdward Tomasz Napierala AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 2298d30f381SDmitry Chagin 2308d30f381SDmitry Chagin /* 2318d30f381SDmitry Chagin * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 2328d30f381SDmitry Chagin * as it has appeared in the 2.4.0-rc7 first time. 2338d30f381SDmitry Chagin * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 2348d30f381SDmitry Chagin * glibc falls back to the hard-coded CLK_TCK value when aux entry 2358d30f381SDmitry Chagin * is not present. 2368d30f381SDmitry Chagin * Also see linux_times() implementation. 2378d30f381SDmitry Chagin */ 2388d30f381SDmitry Chagin if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 2395f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 2405f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 2415f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 2425f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 243ca6e1fa3SEdward Tomasz Napierala AUXARGS_ENTRY(pos, AT_BASE, args->base); 2445f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 2455f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 2465f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 2475f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 2485f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 2495f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 250ca6e1fa3SEdward Tomasz Napierala AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 2514048f59cSDmitry Chagin AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary)); 252ca6e1fa3SEdward Tomasz Napierala AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, 0); 2534048f59cSDmitry Chagin if (imgp->execpathp != 0) 2544048f59cSDmitry Chagin AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp)); 2554d7c2e8aSDmitry Chagin if (args->execfd != -1) 2565f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 257ca6e1fa3SEdward Tomasz Napierala AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 2585f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_NULL, 0); 259ea0fabbcSTim J. Robbins 260ea0fabbcSTim J. Robbins free(imgp->auxargs, M_TEMP); 261ea0fabbcSTim J. Robbins imgp->auxargs = NULL; 2626362b1a6SJung-uk Kim KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 2635f77b8a8SBrooks Davis 264d8010b11SJohn Baldwin error = copyout(argarray, (void *)base, 265d8010b11SJohn Baldwin sizeof(*argarray) * LINUX_AT_COUNT); 2665f77b8a8SBrooks Davis free(argarray, M_TEMP); 26703b0d68cSJohn Baldwin return (error); 2685caa67faSJohn Baldwin } 269ea0fabbcSTim J. Robbins 2705caa67faSJohn Baldwin static int 27131174518SJohn Baldwin linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp) 2725caa67faSJohn Baldwin { 2735caa67faSJohn Baldwin Elf32_Addr *base; 2745caa67faSJohn Baldwin 2755caa67faSJohn Baldwin base = (Elf32_Addr *)*stack_base; 276ea0fabbcSTim J. Robbins base--; 2775f77b8a8SBrooks Davis if (suword32(base, (uint32_t)imgp->args->argc) == -1) 2785f77b8a8SBrooks Davis return (EFAULT); 27931174518SJohn Baldwin *stack_base = (uintptr_t)base; 280af682d48SDmitry Chagin return (0); 281ea0fabbcSTim J. Robbins } 282ea0fabbcSTim J. Robbins 283ea0fabbcSTim J. Robbins static void 2849104847fSDavid Xu linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 285ea0fabbcSTim J. Robbins { 286ea0fabbcSTim J. Robbins struct thread *td = curthread; 287ea0fabbcSTim J. Robbins struct proc *p = td->td_proc; 288ea0fabbcSTim J. Robbins struct sigacts *psp; 289ea0fabbcSTim J. Robbins struct trapframe *regs; 290ea0fabbcSTim J. Robbins struct l_rt_sigframe *fp, frame; 291ea0fabbcSTim J. Robbins int oonstack; 2929104847fSDavid Xu int sig; 2939104847fSDavid Xu int code; 294ea0fabbcSTim J. Robbins 2959104847fSDavid Xu sig = ksi->ksi_signo; 2969104847fSDavid Xu code = ksi->ksi_code; 297ea0fabbcSTim J. Robbins PROC_LOCK_ASSERT(p, MA_OWNED); 298ea0fabbcSTim J. Robbins psp = p->p_sigacts; 299ea0fabbcSTim J. Robbins mtx_assert(&psp->ps_mtx, MA_OWNED); 300ea0fabbcSTim J. Robbins regs = td->td_frame; 301ea0fabbcSTim J. Robbins oonstack = sigonstack(regs->tf_rsp); 302ea0fabbcSTim J. Robbins 3034ba25759SEd Maste /* Allocate space for the signal handler context. */ 304ea0fabbcSTim J. Robbins if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 305ea0fabbcSTim J. Robbins SIGISMEMBER(psp->ps_sigonstack, sig)) { 306aa949be5SJohn Baldwin fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 307ea0fabbcSTim J. Robbins td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 308ea0fabbcSTim J. Robbins } else 309ea0fabbcSTim J. Robbins fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 310ea0fabbcSTim J. Robbins mtx_unlock(&psp->ps_mtx); 311ea0fabbcSTim J. Robbins 3124ba25759SEd Maste /* Build the argument list for the signal handler. */ 3134ab7403bSDmitry Chagin sig = bsd_to_linux_signal(sig); 314ea0fabbcSTim J. Robbins 315ea0fabbcSTim J. Robbins bzero(&frame, sizeof(frame)); 316ea0fabbcSTim J. Robbins 317ea0fabbcSTim J. Robbins frame.sf_handler = PTROUT(catcher); 318ea0fabbcSTim J. Robbins frame.sf_sig = sig; 319ea0fabbcSTim J. Robbins frame.sf_siginfo = PTROUT(&fp->sf_si); 320ea0fabbcSTim J. Robbins frame.sf_ucontext = PTROUT(&fp->sf_sc); 321ea0fabbcSTim J. Robbins 3224ba25759SEd Maste /* Fill in POSIX parts. */ 323f4e80108SDmitry Chagin siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig); 324ea0fabbcSTim J. Robbins 325ea0fabbcSTim J. Robbins /* 3264ba25759SEd Maste * Build the signal context to be used by sigreturn and libgcc unwind. 327ea0fabbcSTim J. Robbins */ 328ea0fabbcSTim J. Robbins frame.sf_sc.uc_flags = 0; /* XXX ??? */ 329ea0fabbcSTim J. Robbins frame.sf_sc.uc_link = 0; /* XXX ??? */ 330ea0fabbcSTim J. Robbins 331ea0fabbcSTim J. Robbins frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 332ea0fabbcSTim J. Robbins frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 333ea0fabbcSTim J. Robbins frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 334ea0fabbcSTim J. Robbins ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 335ea0fabbcSTim J. Robbins PROC_UNLOCK(p); 336ea0fabbcSTim J. Robbins 337ea0fabbcSTim J. Robbins bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 338ea0fabbcSTim J. Robbins 3394ab7403bSDmitry Chagin frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 340ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi; 341ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi; 342ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp; 343ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx; 344bdc37934SDmitry Chagin frame.sf_sc.uc_mcontext.sc_esp = regs->tf_rsp; 345ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx; 346ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx; 347ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax; 348ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip; 349ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 3502c66cccaSKonstantin Belousov frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs; 3512c66cccaSKonstantin Belousov frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 3522c66cccaSKonstantin Belousov frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 3532c66cccaSKonstantin Belousov frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 354ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags; 355ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 356ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 357ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 35896a2b635SKonstantin Belousov frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 359ea0fabbcSTim J. Robbins frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 360ea0fabbcSTim J. Robbins 361ea0fabbcSTim J. Robbins if (copyout(&frame, fp, sizeof(frame)) != 0) { 362ea0fabbcSTim J. Robbins /* 363ea0fabbcSTim J. Robbins * Process has trashed its stack; give it an illegal 364ea0fabbcSTim J. Robbins * instruction to halt it in its tracks. 365ea0fabbcSTim J. Robbins */ 366ea0fabbcSTim J. Robbins PROC_LOCK(p); 367ea0fabbcSTim J. Robbins sigexit(td, SIGILL); 368ea0fabbcSTim J. Robbins } 369ea0fabbcSTim J. Robbins 3704ba25759SEd Maste /* Build context to run handler in. */ 371ea0fabbcSTim J. Robbins regs->tf_rsp = PTROUT(fp); 3729931033bSDmitry Chagin regs->tf_rip = __kernel_rt_sigreturn; 37322eca0bfSKonstantin Belousov regs->tf_rflags &= ~(PSL_T | PSL_D); 374ea0fabbcSTim J. Robbins regs->tf_cs = _ucode32sel; 375ea0fabbcSTim J. Robbins regs->tf_ss = _udatasel; 3762c66cccaSKonstantin Belousov regs->tf_ds = _udatasel; 3772c66cccaSKonstantin Belousov regs->tf_es = _udatasel; 3782c66cccaSKonstantin Belousov regs->tf_fs = _ufssel; 3792c66cccaSKonstantin Belousov regs->tf_gs = _ugssel; 3802c66cccaSKonstantin Belousov regs->tf_flags = TF_HASSEGS; 381e6c006d9SJung-uk Kim set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 382ea0fabbcSTim J. Robbins PROC_LOCK(p); 383ea0fabbcSTim J. Robbins mtx_lock(&psp->ps_mtx); 384ea0fabbcSTim J. Robbins } 385ea0fabbcSTim J. Robbins 386ea0fabbcSTim J. Robbins /* 387ea0fabbcSTim J. Robbins * Send an interrupt to process. 388ea0fabbcSTim J. Robbins * 389ea0fabbcSTim J. Robbins * Stack is set up to allow sigcode stored 390ea0fabbcSTim J. Robbins * in u. to call routine, followed by kcall 391ea0fabbcSTim J. Robbins * to sigreturn routine below. After sigreturn 392ea0fabbcSTim J. Robbins * resets the signal mask, the stack, and the 393ea0fabbcSTim J. Robbins * frame pointer, it returns to the user 394ea0fabbcSTim J. Robbins * specified pc, psl. 395ea0fabbcSTim J. Robbins */ 396ea0fabbcSTim J. Robbins static void 3979104847fSDavid Xu linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 398ea0fabbcSTim J. Robbins { 399ea0fabbcSTim J. Robbins struct thread *td = curthread; 400ea0fabbcSTim J. Robbins struct proc *p = td->td_proc; 401ea0fabbcSTim J. Robbins struct sigacts *psp; 402ea0fabbcSTim J. Robbins struct trapframe *regs; 403ea0fabbcSTim J. Robbins struct l_sigframe *fp, frame; 404ea0fabbcSTim J. Robbins l_sigset_t lmask; 4054ab7403bSDmitry Chagin int oonstack; 4069104847fSDavid Xu int sig, code; 407ea0fabbcSTim J. Robbins 4089104847fSDavid Xu sig = ksi->ksi_signo; 4099104847fSDavid Xu code = ksi->ksi_code; 410ea0fabbcSTim J. Robbins PROC_LOCK_ASSERT(p, MA_OWNED); 411ea0fabbcSTim J. Robbins psp = p->p_sigacts; 412ea0fabbcSTim J. Robbins mtx_assert(&psp->ps_mtx, MA_OWNED); 413ea0fabbcSTim J. Robbins if (SIGISMEMBER(psp->ps_siginfo, sig)) { 414ea0fabbcSTim J. Robbins /* Signal handler installed with SA_SIGINFO. */ 4159104847fSDavid Xu linux_rt_sendsig(catcher, ksi, mask); 416ea0fabbcSTim J. Robbins return; 417ea0fabbcSTim J. Robbins } 418ea0fabbcSTim J. Robbins 419ea0fabbcSTim J. Robbins regs = td->td_frame; 420ea0fabbcSTim J. Robbins oonstack = sigonstack(regs->tf_rsp); 421ea0fabbcSTim J. Robbins 4224ba25759SEd Maste /* Allocate space for the signal handler context. */ 423ea0fabbcSTim J. Robbins if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 424ea0fabbcSTim J. Robbins SIGISMEMBER(psp->ps_sigonstack, sig)) { 425aa949be5SJohn Baldwin fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 426ea0fabbcSTim J. Robbins td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 427ea0fabbcSTim J. Robbins } else 428ea0fabbcSTim J. Robbins fp = (struct l_sigframe *)regs->tf_rsp - 1; 429ea0fabbcSTim J. Robbins mtx_unlock(&psp->ps_mtx); 430ea0fabbcSTim J. Robbins PROC_UNLOCK(p); 431ea0fabbcSTim J. Robbins 4324ba25759SEd Maste /* Build the argument list for the signal handler. */ 4334ab7403bSDmitry Chagin sig = bsd_to_linux_signal(sig); 434ea0fabbcSTim J. Robbins 435ea0fabbcSTim J. Robbins bzero(&frame, sizeof(frame)); 436ea0fabbcSTim J. Robbins 437ea0fabbcSTim J. Robbins frame.sf_handler = PTROUT(catcher); 438ea0fabbcSTim J. Robbins frame.sf_sig = sig; 439ea0fabbcSTim J. Robbins 440ea0fabbcSTim J. Robbins bsd_to_linux_sigset(mask, &lmask); 441ea0fabbcSTim J. Robbins 4424ba25759SEd Maste /* Build the signal context to be used by sigreturn. */ 4434ab7403bSDmitry Chagin frame.sf_sc.sc_mask = lmask.__mask; 4442c66cccaSKonstantin Belousov frame.sf_sc.sc_gs = regs->tf_gs; 4452c66cccaSKonstantin Belousov frame.sf_sc.sc_fs = regs->tf_fs; 4462c66cccaSKonstantin Belousov frame.sf_sc.sc_es = regs->tf_es; 4472c66cccaSKonstantin Belousov frame.sf_sc.sc_ds = regs->tf_ds; 448ea0fabbcSTim J. Robbins frame.sf_sc.sc_edi = regs->tf_rdi; 449ea0fabbcSTim J. Robbins frame.sf_sc.sc_esi = regs->tf_rsi; 450ea0fabbcSTim J. Robbins frame.sf_sc.sc_ebp = regs->tf_rbp; 451ea0fabbcSTim J. Robbins frame.sf_sc.sc_ebx = regs->tf_rbx; 452bdc37934SDmitry Chagin frame.sf_sc.sc_esp = regs->tf_rsp; 453ea0fabbcSTim J. Robbins frame.sf_sc.sc_edx = regs->tf_rdx; 454ea0fabbcSTim J. Robbins frame.sf_sc.sc_ecx = regs->tf_rcx; 455ea0fabbcSTim J. Robbins frame.sf_sc.sc_eax = regs->tf_rax; 456ea0fabbcSTim J. Robbins frame.sf_sc.sc_eip = regs->tf_rip; 457ea0fabbcSTim J. Robbins frame.sf_sc.sc_cs = regs->tf_cs; 458ea0fabbcSTim J. Robbins frame.sf_sc.sc_eflags = regs->tf_rflags; 459ea0fabbcSTim J. Robbins frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 460ea0fabbcSTim J. Robbins frame.sf_sc.sc_ss = regs->tf_ss; 461ea0fabbcSTim J. Robbins frame.sf_sc.sc_err = regs->tf_err; 46296a2b635SKonstantin Belousov frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 463ea0fabbcSTim J. Robbins frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 464ea0fabbcSTim J. Robbins 4654ab7403bSDmitry Chagin frame.sf_extramask[0] = lmask.__mask; 466ea0fabbcSTim J. Robbins 467ea0fabbcSTim J. Robbins if (copyout(&frame, fp, sizeof(frame)) != 0) { 468ea0fabbcSTim J. Robbins /* 469ea0fabbcSTim J. Robbins * Process has trashed its stack; give it an illegal 470ea0fabbcSTim J. Robbins * instruction to halt it in its tracks. 471ea0fabbcSTim J. Robbins */ 472ea0fabbcSTim J. Robbins PROC_LOCK(p); 473ea0fabbcSTim J. Robbins sigexit(td, SIGILL); 474ea0fabbcSTim J. Robbins } 475ea0fabbcSTim J. Robbins 4764ba25759SEd Maste /* Build context to run handler in. */ 477ea0fabbcSTim J. Robbins regs->tf_rsp = PTROUT(fp); 4789931033bSDmitry Chagin regs->tf_rip = __kernel_sigreturn; 47922eca0bfSKonstantin Belousov regs->tf_rflags &= ~(PSL_T | PSL_D); 480ea0fabbcSTim J. Robbins regs->tf_cs = _ucode32sel; 481ea0fabbcSTim J. Robbins regs->tf_ss = _udatasel; 4822c66cccaSKonstantin Belousov regs->tf_ds = _udatasel; 4832c66cccaSKonstantin Belousov regs->tf_es = _udatasel; 4842c66cccaSKonstantin Belousov regs->tf_fs = _ufssel; 4852c66cccaSKonstantin Belousov regs->tf_gs = _ugssel; 4862c66cccaSKonstantin Belousov regs->tf_flags = TF_HASSEGS; 487e6c006d9SJung-uk Kim set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 488ea0fabbcSTim J. Robbins PROC_LOCK(p); 489ea0fabbcSTim J. Robbins mtx_lock(&psp->ps_mtx); 490ea0fabbcSTim J. Robbins } 491ea0fabbcSTim J. Robbins 492ea0fabbcSTim J. Robbins /* 493ea0fabbcSTim J. Robbins * System call to cleanup state after a signal 494ea0fabbcSTim J. Robbins * has been taken. Reset signal mask and 495ea0fabbcSTim J. Robbins * stack state from context left by sendsig (above). 496ea0fabbcSTim J. Robbins * Return to previous pc and psl as specified by 497ea0fabbcSTim J. Robbins * context left by sendsig. Check carefully to 498ea0fabbcSTim J. Robbins * make sure that the user has not modified the 499ea0fabbcSTim J. Robbins * psl to gain improper privileges or to cause 500ea0fabbcSTim J. Robbins * a machine fault. 501ea0fabbcSTim J. Robbins */ 502ea0fabbcSTim J. Robbins int 503ea0fabbcSTim J. Robbins linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 504ea0fabbcSTim J. Robbins { 505ea0fabbcSTim J. Robbins struct l_sigframe frame; 506ea0fabbcSTim J. Robbins struct trapframe *regs; 507d6e029adSKonstantin Belousov sigset_t bmask; 508ea0fabbcSTim J. Robbins l_sigset_t lmask; 5094ab7403bSDmitry Chagin int eflags; 5109104847fSDavid Xu ksiginfo_t ksi; 511ea0fabbcSTim J. Robbins 512ea0fabbcSTim J. Robbins regs = td->td_frame; 513ea0fabbcSTim J. Robbins 514ea0fabbcSTim J. Robbins /* 515ea0fabbcSTim J. Robbins * The trampoline code hands us the sigframe. 516ea0fabbcSTim J. Robbins * It is unsafe to keep track of it ourselves, in the event that a 517ea0fabbcSTim J. Robbins * program jumps out of a signal handler. 518ea0fabbcSTim J. Robbins */ 519ea0fabbcSTim J. Robbins if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 520ea0fabbcSTim J. Robbins return (EFAULT); 521ea0fabbcSTim J. Robbins 5224ba25759SEd Maste /* Check for security violations. */ 523ea0fabbcSTim J. Robbins eflags = frame.sf_sc.sc_eflags; 524a42d362bSKonstantin Belousov if (!EFL_SECURE(eflags, regs->tf_rflags)) 525ea0fabbcSTim J. Robbins return(EINVAL); 526ea0fabbcSTim J. Robbins 527ea0fabbcSTim J. Robbins /* 528ea0fabbcSTim J. Robbins * Don't allow users to load a valid privileged %cs. Let the 529ea0fabbcSTim J. Robbins * hardware check for invalid selectors, excess privilege in 530ea0fabbcSTim J. Robbins * other selectors, invalid %eip's and invalid %esp's. 531ea0fabbcSTim J. Robbins */ 532ea0fabbcSTim J. Robbins if (!CS_SECURE(frame.sf_sc.sc_cs)) { 5339104847fSDavid Xu ksiginfo_init_trap(&ksi); 5349104847fSDavid Xu ksi.ksi_signo = SIGBUS; 5359104847fSDavid Xu ksi.ksi_code = BUS_OBJERR; 5369104847fSDavid Xu ksi.ksi_trapno = T_PROTFLT; 5379104847fSDavid Xu ksi.ksi_addr = (void *)regs->tf_rip; 5389104847fSDavid Xu trapsignal(td, &ksi); 539ea0fabbcSTim J. Robbins return(EINVAL); 540ea0fabbcSTim J. Robbins } 541ea0fabbcSTim J. Robbins 5424ab7403bSDmitry Chagin lmask.__mask = frame.sf_sc.sc_mask; 5434ab7403bSDmitry Chagin lmask.__mask = frame.sf_extramask[0]; 544d6e029adSKonstantin Belousov linux_to_bsd_sigset(&lmask, &bmask); 545d6e029adSKonstantin Belousov kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 546ea0fabbcSTim J. Robbins 5474ba25759SEd Maste /* Restore signal context. */ 548ea0fabbcSTim J. Robbins regs->tf_rdi = frame.sf_sc.sc_edi; 549ea0fabbcSTim J. Robbins regs->tf_rsi = frame.sf_sc.sc_esi; 550ea0fabbcSTim J. Robbins regs->tf_rbp = frame.sf_sc.sc_ebp; 551ea0fabbcSTim J. Robbins regs->tf_rbx = frame.sf_sc.sc_ebx; 552ea0fabbcSTim J. Robbins regs->tf_rdx = frame.sf_sc.sc_edx; 553ea0fabbcSTim J. Robbins regs->tf_rcx = frame.sf_sc.sc_ecx; 554ea0fabbcSTim J. Robbins regs->tf_rax = frame.sf_sc.sc_eax; 555ea0fabbcSTim J. Robbins regs->tf_rip = frame.sf_sc.sc_eip; 556ea0fabbcSTim J. Robbins regs->tf_cs = frame.sf_sc.sc_cs; 5572c66cccaSKonstantin Belousov regs->tf_ds = frame.sf_sc.sc_ds; 5582c66cccaSKonstantin Belousov regs->tf_es = frame.sf_sc.sc_es; 5592c66cccaSKonstantin Belousov regs->tf_fs = frame.sf_sc.sc_fs; 5602c66cccaSKonstantin Belousov regs->tf_gs = frame.sf_sc.sc_gs; 561ea0fabbcSTim J. Robbins regs->tf_rflags = eflags; 562ea0fabbcSTim J. Robbins regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 563ea0fabbcSTim J. Robbins regs->tf_ss = frame.sf_sc.sc_ss; 564e6c006d9SJung-uk Kim set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 565ea0fabbcSTim J. Robbins 566ea0fabbcSTim J. Robbins return (EJUSTRETURN); 567ea0fabbcSTim J. Robbins } 568ea0fabbcSTim J. Robbins 569ea0fabbcSTim J. Robbins /* 570ea0fabbcSTim J. Robbins * System call to cleanup state after a signal 571ea0fabbcSTim J. Robbins * has been taken. Reset signal mask and 572ea0fabbcSTim J. Robbins * stack state from context left by rt_sendsig (above). 573ea0fabbcSTim J. Robbins * Return to previous pc and psl as specified by 574ea0fabbcSTim J. Robbins * context left by sendsig. Check carefully to 575ea0fabbcSTim J. Robbins * make sure that the user has not modified the 576ea0fabbcSTim J. Robbins * psl to gain improper privileges or to cause 577ea0fabbcSTim J. Robbins * a machine fault. 578ea0fabbcSTim J. Robbins */ 579ea0fabbcSTim J. Robbins int 580ea0fabbcSTim J. Robbins linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 581ea0fabbcSTim J. Robbins { 582ea0fabbcSTim J. Robbins struct l_ucontext uc; 583ea0fabbcSTim J. Robbins struct l_sigcontext *context; 584d6e029adSKonstantin Belousov sigset_t bmask; 585ea0fabbcSTim J. Robbins l_stack_t *lss; 586ea0fabbcSTim J. Robbins stack_t ss; 587ea0fabbcSTim J. Robbins struct trapframe *regs; 588ea0fabbcSTim J. Robbins int eflags; 5899104847fSDavid Xu ksiginfo_t ksi; 590ea0fabbcSTim J. Robbins 591ea0fabbcSTim J. Robbins regs = td->td_frame; 592ea0fabbcSTim J. Robbins 593ea0fabbcSTim J. Robbins /* 594ea0fabbcSTim J. Robbins * The trampoline code hands us the ucontext. 595ea0fabbcSTim J. Robbins * It is unsafe to keep track of it ourselves, in the event that a 596ea0fabbcSTim J. Robbins * program jumps out of a signal handler. 597ea0fabbcSTim J. Robbins */ 598ea0fabbcSTim J. Robbins if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 599ea0fabbcSTim J. Robbins return (EFAULT); 600ea0fabbcSTim J. Robbins 601ea0fabbcSTim J. Robbins context = &uc.uc_mcontext; 602ea0fabbcSTim J. Robbins 6034ba25759SEd Maste /* Check for security violations. */ 604ea0fabbcSTim J. Robbins eflags = context->sc_eflags; 605a42d362bSKonstantin Belousov if (!EFL_SECURE(eflags, regs->tf_rflags)) 606ea0fabbcSTim J. Robbins return(EINVAL); 607ea0fabbcSTim J. Robbins 608ea0fabbcSTim J. Robbins /* 609ea0fabbcSTim J. Robbins * Don't allow users to load a valid privileged %cs. Let the 610ea0fabbcSTim J. Robbins * hardware check for invalid selectors, excess privilege in 611ea0fabbcSTim J. Robbins * other selectors, invalid %eip's and invalid %esp's. 612ea0fabbcSTim J. Robbins */ 613ea0fabbcSTim J. Robbins if (!CS_SECURE(context->sc_cs)) { 6149104847fSDavid Xu ksiginfo_init_trap(&ksi); 6159104847fSDavid Xu ksi.ksi_signo = SIGBUS; 6169104847fSDavid Xu ksi.ksi_code = BUS_OBJERR; 6179104847fSDavid Xu ksi.ksi_trapno = T_PROTFLT; 6189104847fSDavid Xu ksi.ksi_addr = (void *)regs->tf_rip; 6199104847fSDavid Xu trapsignal(td, &ksi); 620ea0fabbcSTim J. Robbins return(EINVAL); 621ea0fabbcSTim J. Robbins } 622ea0fabbcSTim J. Robbins 623d6e029adSKonstantin Belousov linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 624d6e029adSKonstantin Belousov kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 625ea0fabbcSTim J. Robbins 626ea0fabbcSTim J. Robbins /* 627ea0fabbcSTim J. Robbins * Restore signal context 628ea0fabbcSTim J. Robbins */ 6292c66cccaSKonstantin Belousov regs->tf_gs = context->sc_gs; 6302c66cccaSKonstantin Belousov regs->tf_fs = context->sc_fs; 6312c66cccaSKonstantin Belousov regs->tf_es = context->sc_es; 6322c66cccaSKonstantin Belousov regs->tf_ds = context->sc_ds; 633ea0fabbcSTim J. Robbins regs->tf_rdi = context->sc_edi; 634ea0fabbcSTim J. Robbins regs->tf_rsi = context->sc_esi; 635ea0fabbcSTim J. Robbins regs->tf_rbp = context->sc_ebp; 636ea0fabbcSTim J. Robbins regs->tf_rbx = context->sc_ebx; 637ea0fabbcSTim J. Robbins regs->tf_rdx = context->sc_edx; 638ea0fabbcSTim J. Robbins regs->tf_rcx = context->sc_ecx; 639ea0fabbcSTim J. Robbins regs->tf_rax = context->sc_eax; 640ea0fabbcSTim J. Robbins regs->tf_rip = context->sc_eip; 641ea0fabbcSTim J. Robbins regs->tf_cs = context->sc_cs; 642ea0fabbcSTim J. Robbins regs->tf_rflags = eflags; 643ea0fabbcSTim J. Robbins regs->tf_rsp = context->sc_esp_at_signal; 644ea0fabbcSTim J. Robbins regs->tf_ss = context->sc_ss; 645e6c006d9SJung-uk Kim set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 646ea0fabbcSTim J. Robbins 647ea0fabbcSTim J. Robbins /* 648ea0fabbcSTim J. Robbins * call sigaltstack & ignore results.. 649ea0fabbcSTim J. Robbins */ 650ea0fabbcSTim J. Robbins lss = &uc.uc_stack; 651ea0fabbcSTim J. Robbins ss.ss_sp = PTRIN(lss->ss_sp); 652ea0fabbcSTim J. Robbins ss.ss_size = lss->ss_size; 653ea0fabbcSTim J. Robbins ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 654ea0fabbcSTim J. Robbins 655ea0fabbcSTim J. Robbins (void)kern_sigaltstack(td, &ss, NULL); 656ea0fabbcSTim J. Robbins 657ea0fabbcSTim J. Robbins return (EJUSTRETURN); 658ea0fabbcSTim J. Robbins } 659ea0fabbcSTim J. Robbins 660afe1a688SKonstantin Belousov static int 6612d88da2fSKonstantin Belousov linux32_fetch_syscall_args(struct thread *td) 662ea0fabbcSTim J. Robbins { 663afe1a688SKonstantin Belousov struct proc *p; 664afe1a688SKonstantin Belousov struct trapframe *frame; 6652d88da2fSKonstantin Belousov struct syscall_args *sa; 666afe1a688SKonstantin Belousov 667afe1a688SKonstantin Belousov p = td->td_proc; 668afe1a688SKonstantin Belousov frame = td->td_frame; 6692d88da2fSKonstantin Belousov sa = &td->td_sa; 670afe1a688SKonstantin Belousov 671afe1a688SKonstantin Belousov sa->args[0] = frame->tf_rbx; 672afe1a688SKonstantin Belousov sa->args[1] = frame->tf_rcx; 673afe1a688SKonstantin Belousov sa->args[2] = frame->tf_rdx; 674afe1a688SKonstantin Belousov sa->args[3] = frame->tf_rsi; 675afe1a688SKonstantin Belousov sa->args[4] = frame->tf_rdi; 676afe1a688SKonstantin Belousov sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 677afe1a688SKonstantin Belousov sa->code = frame->tf_rax; 678cf98bc28SDavid Chisnall sa->original_code = sa->code; 679afe1a688SKonstantin Belousov 680afe1a688SKonstantin Belousov if (sa->code >= p->p_sysent->sv_size) 681fcdffc03SDmitry Chagin /* nosys */ 6825047105bSJohn Baldwin sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 683afe1a688SKonstantin Belousov else 684afe1a688SKonstantin Belousov sa->callp = &p->p_sysent->sv_table[sa->code]; 685afe1a688SKonstantin Belousov 686afe1a688SKonstantin Belousov td->td_retval[0] = 0; 687afe1a688SKonstantin Belousov td->td_retval[1] = frame->tf_rdx; 688afe1a688SKonstantin Belousov 689afe1a688SKonstantin Belousov return (0); 690ea0fabbcSTim J. Robbins } 691ea0fabbcSTim J. Robbins 692c26391f4SEdward Tomasz Napierala static void 693c26391f4SEdward Tomasz Napierala linux32_set_syscall_retval(struct thread *td, int error) 694c26391f4SEdward Tomasz Napierala { 695c26391f4SEdward Tomasz Napierala struct trapframe *frame = td->td_frame; 696c26391f4SEdward Tomasz Napierala 697c26391f4SEdward Tomasz Napierala cpu_set_syscall_retval(td, error); 698c26391f4SEdward Tomasz Napierala 699c26391f4SEdward Tomasz Napierala if (__predict_false(error != 0)) { 700c26391f4SEdward Tomasz Napierala if (error != ERESTART && error != EJUSTRETURN) 701866b1f51SEdward Tomasz Napierala frame->tf_rax = bsd_to_linux_errno(error); 702c26391f4SEdward Tomasz Napierala } 703c26391f4SEdward Tomasz Napierala } 704c26391f4SEdward Tomasz Napierala 705de8374dfSDmitry Chagin static void 706de8374dfSDmitry Chagin linux32_set_fork_retval(struct thread *td) 707de8374dfSDmitry Chagin { 708de8374dfSDmitry Chagin struct trapframe *frame = td->td_frame; 709de8374dfSDmitry Chagin 710de8374dfSDmitry Chagin frame->tf_rax = 0; 711de8374dfSDmitry Chagin } 712de8374dfSDmitry Chagin 713ea0fabbcSTim J. Robbins /* 714ea0fabbcSTim J. Robbins * Clear registers on exec 715ea0fabbcSTim J. Robbins * XXX copied from ia32_signal.c. 716ea0fabbcSTim J. Robbins */ 717ea0fabbcSTim J. Robbins static void 71831174518SJohn Baldwin linux_exec_setregs(struct thread *td, struct image_params *imgp, 71931174518SJohn Baldwin uintptr_t stack) 720ea0fabbcSTim J. Robbins { 721ea0fabbcSTim J. Robbins struct trapframe *regs = td->td_frame; 722ea0fabbcSTim J. Robbins struct pcb *pcb = td->td_pcb; 7237c5d1690SKonstantin Belousov register_t saved_rflags; 7247c5d1690SKonstantin Belousov 7257c5d1690SKonstantin Belousov regs = td->td_frame; 7267c5d1690SKonstantin Belousov pcb = td->td_pcb; 727ea0fabbcSTim J. Robbins 7282c66cccaSKonstantin Belousov if (td->td_proc->p_md.md_ldt != NULL) 7292c66cccaSKonstantin Belousov user_ldt_free(td); 7302c66cccaSKonstantin Belousov 7319c5b213eSJung-uk Kim critical_enter(); 732ea0fabbcSTim J. Robbins wrmsr(MSR_FSBASE, 0); 733ea0fabbcSTim J. Robbins wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 734ea0fabbcSTim J. Robbins pcb->pcb_fsbase = 0; 735ea0fabbcSTim J. Robbins pcb->pcb_gsbase = 0; 7369c5b213eSJung-uk Kim critical_exit(); 7372ee8325fSJohn Baldwin pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 738ea0fabbcSTim J. Robbins 7397c5d1690SKonstantin Belousov saved_rflags = regs->tf_rflags & PSL_T; 740ea0fabbcSTim J. Robbins bzero((char *)regs, sizeof(struct trapframe)); 741a107d8aaSNathan Whitehorn regs->tf_rip = imgp->entry_addr; 742ea0fabbcSTim J. Robbins regs->tf_rsp = stack; 7437c5d1690SKonstantin Belousov regs->tf_rflags = PSL_USER | saved_rflags; 7442c66cccaSKonstantin Belousov regs->tf_gs = _ugssel; 7452c66cccaSKonstantin Belousov regs->tf_fs = _ufssel; 7462c66cccaSKonstantin Belousov regs->tf_es = _udatasel; 7472c66cccaSKonstantin Belousov regs->tf_ds = _udatasel; 748ea0fabbcSTim J. Robbins regs->tf_ss = _udatasel; 7492c66cccaSKonstantin Belousov regs->tf_flags = TF_HASSEGS; 750ea0fabbcSTim J. Robbins regs->tf_cs = _ucode32sel; 751397df744SBrooks Davis regs->tf_rbx = (register_t)imgp->ps_strings; 752bdbf2db5SJung-uk Kim 75394172affSKonstantin Belousov x86_clear_dbregs(pcb); 75494172affSKonstantin Belousov 7552a988f7cSStephan Uphoff fpstate_drop(td); 756ea0fabbcSTim J. Robbins 7571b3c3256SKonstantin Belousov /* Do full restore on return so that we can change to a different %cs */ 758e6c006d9SJung-uk Kim set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 759ea0fabbcSTim J. Robbins } 760ea0fabbcSTim J. Robbins 761ea0fabbcSTim J. Robbins /* 762ea0fabbcSTim J. Robbins * XXX copied from ia32_sysvec.c. 763ea0fabbcSTim J. Robbins */ 76403b0d68cSJohn Baldwin static int 76531174518SJohn Baldwin linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) 766ea0fabbcSTim J. Robbins { 76703b0d68cSJohn Baldwin int argc, envc, error; 768ea0fabbcSTim J. Robbins u_int32_t *vectp; 76931174518SJohn Baldwin char *stringp; 77031174518SJohn Baldwin uintptr_t destp, ustringp; 771ea0fabbcSTim J. Robbins struct linux32_ps_strings *arginfo; 7724048f59cSDmitry Chagin char canary[LINUX_AT_RANDOM_LEN]; 7734048f59cSDmitry Chagin size_t execpath_len; 774ea0fabbcSTim J. Robbins 7756bea696aSJohn Baldwin arginfo = (struct linux32_ps_strings *)PROC_PS_STRINGS(imgp->proc); 77631174518SJohn Baldwin destp = (uintptr_t)arginfo; 777ea0fabbcSTim J. Robbins 778f04a0960SMark Johnston if (imgp->execpath != NULL && imgp->auxargs != NULL) { 779f04a0960SMark Johnston execpath_len = strlen(imgp->execpath) + 1; 78031174518SJohn Baldwin destp -= execpath_len; 78123a5b4edSJohn Baldwin destp = rounddown2(destp, sizeof(uint32_t)); 782b24e6ac8SBrooks Davis imgp->execpathp = (void *)destp; 783b24e6ac8SBrooks Davis error = copyout(imgp->execpath, imgp->execpathp, execpath_len); 78403b0d68cSJohn Baldwin if (error != 0) 78503b0d68cSJohn Baldwin return (error); 7864048f59cSDmitry Chagin } 7874048f59cSDmitry Chagin 7884ba25759SEd Maste /* Prepare the canary for SSP. */ 7894048f59cSDmitry Chagin arc4rand(canary, sizeof(canary), 0); 79023a5b4edSJohn Baldwin destp -= roundup(sizeof(canary), sizeof(uint32_t)); 791b24e6ac8SBrooks Davis imgp->canary = (void *)destp; 792b24e6ac8SBrooks Davis error = copyout(canary, imgp->canary, sizeof(canary)); 79303b0d68cSJohn Baldwin if (error != 0) 79403b0d68cSJohn Baldwin return (error); 7954048f59cSDmitry Chagin 79631174518SJohn Baldwin /* Allocate room for the argument and environment strings. */ 79731174518SJohn Baldwin destp -= ARG_MAX - imgp->args->stringspace; 79823a5b4edSJohn Baldwin destp = rounddown2(destp, sizeof(uint32_t)); 79931174518SJohn Baldwin ustringp = destp; 80031174518SJohn Baldwin 80103b0d68cSJohn Baldwin if (imgp->auxargs) { 802d8010b11SJohn Baldwin /* 803d8010b11SJohn Baldwin * Allocate room on the stack for the ELF auxargs 804d8010b11SJohn Baldwin * array. It has LINUX_AT_COUNT entries. 805d8010b11SJohn Baldwin */ 806d8010b11SJohn Baldwin destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo); 80723a5b4edSJohn Baldwin destp = rounddown2(destp, sizeof(uint32_t)); 80803b0d68cSJohn Baldwin } 809ea0fabbcSTim J. Robbins 81031174518SJohn Baldwin vectp = (uint32_t *)destp; 81131174518SJohn Baldwin 81273c8686eSJohn Baldwin /* 81373c8686eSJohn Baldwin * Allocate room for the argv[] and env vectors including the 81473c8686eSJohn Baldwin * terminating NULL pointers. 81573c8686eSJohn Baldwin */ 81673c8686eSJohn Baldwin vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 81773c8686eSJohn Baldwin 8184ba25759SEd Maste /* vectp also becomes our initial stack base. */ 81931174518SJohn Baldwin *stack_base = (uintptr_t)vectp; 820ea0fabbcSTim J. Robbins 821610ecfe0SMaxim Sobolev stringp = imgp->args->begin_argv; 822610ecfe0SMaxim Sobolev argc = imgp->args->argc; 823610ecfe0SMaxim Sobolev envc = imgp->args->envc; 82431174518SJohn Baldwin 8254ba25759SEd Maste /* Copy out strings - arguments and environment. */ 82631174518SJohn Baldwin error = copyout(stringp, (void *)ustringp, 82731174518SJohn Baldwin ARG_MAX - imgp->args->stringspace); 82803b0d68cSJohn Baldwin if (error != 0) 82903b0d68cSJohn Baldwin return (error); 830ea0fabbcSTim J. Robbins 8314ba25759SEd Maste /* Fill in "ps_strings" struct for ps, w, etc. */ 83203b0d68cSJohn Baldwin if (suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp) != 0 || 83303b0d68cSJohn Baldwin suword32(&arginfo->ps_nargvstr, argc) != 0) 83403b0d68cSJohn Baldwin return (EFAULT); 835ea0fabbcSTim J. Robbins 8364ba25759SEd Maste /* Fill in argument portion of vector table. */ 837ea0fabbcSTim J. Robbins for (; argc > 0; --argc) { 83831174518SJohn Baldwin if (suword32(vectp++, ustringp) != 0) 83903b0d68cSJohn Baldwin return (EFAULT); 840ea0fabbcSTim J. Robbins while (*stringp++ != 0) 84131174518SJohn Baldwin ustringp++; 84231174518SJohn Baldwin ustringp++; 843ea0fabbcSTim J. Robbins } 844ea0fabbcSTim J. Robbins 8454ba25759SEd Maste /* A null vector table pointer separates the argp's from the envp's. */ 84603b0d68cSJohn Baldwin if (suword32(vectp++, 0) != 0) 84703b0d68cSJohn Baldwin return (EFAULT); 848ea0fabbcSTim J. Robbins 84903b0d68cSJohn Baldwin if (suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp) != 0 || 85003b0d68cSJohn Baldwin suword32(&arginfo->ps_nenvstr, envc) != 0) 85103b0d68cSJohn Baldwin return (EFAULT); 852ea0fabbcSTim J. Robbins 8534ba25759SEd Maste /* Fill in environment portion of vector table. */ 854ea0fabbcSTim J. Robbins for (; envc > 0; --envc) { 85531174518SJohn Baldwin if (suword32(vectp++, ustringp) != 0) 85603b0d68cSJohn Baldwin return (EFAULT); 857ea0fabbcSTim J. Robbins while (*stringp++ != 0) 85831174518SJohn Baldwin ustringp++; 85931174518SJohn Baldwin ustringp++; 860ea0fabbcSTim J. Robbins } 861ea0fabbcSTim J. Robbins 8624ba25759SEd Maste /* The end of the vector table is a null pointer. */ 86303b0d68cSJohn Baldwin if (suword32(vectp, 0) != 0) 86403b0d68cSJohn Baldwin return (EFAULT); 865ea0fabbcSTim J. Robbins 866d8010b11SJohn Baldwin if (imgp->auxargs) { 867d8010b11SJohn Baldwin vectp++; 868d8010b11SJohn Baldwin error = imgp->sysent->sv_copyout_auxargs(imgp, 869d8010b11SJohn Baldwin (uintptr_t)vectp); 870d8010b11SJohn Baldwin if (error != 0) 871d8010b11SJohn Baldwin return (error); 872d8010b11SJohn Baldwin } 873d8010b11SJohn Baldwin 87403b0d68cSJohn Baldwin return (0); 875ea0fabbcSTim J. Robbins } 876ea0fabbcSTim J. Robbins 8777029da5cSPawel Biernacki static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 878ea0fabbcSTim J. Robbins "32-bit Linux emulation"); 879ea0fabbcSTim J. Robbins 880ea0fabbcSTim J. Robbins static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 881ea0fabbcSTim J. Robbins SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 882ea0fabbcSTim J. Robbins &linux32_maxdsiz, 0, ""); 883ea0fabbcSTim J. Robbins static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 884ea0fabbcSTim J. Robbins SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 885ea0fabbcSTim J. Robbins &linux32_maxssiz, 0, ""); 886ea0fabbcSTim J. Robbins static u_long linux32_maxvmem = LINUX32_MAXVMEM; 887ea0fabbcSTim J. Robbins SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 888ea0fabbcSTim J. Robbins &linux32_maxvmem, 0, ""); 889d5dc757eSDmitry Chagin bool linux32_emulate_i386 = false; 890d5dc757eSDmitry Chagin SYSCTL_BOOL(_compat_linux32, OID_AUTO, emulate_i386, CTLFLAG_RWTUN, 891d5dc757eSDmitry Chagin &linux32_emulate_i386, 0, "Emulate the real i386"); 892ea0fabbcSTim J. Robbins 893ea0fabbcSTim J. Robbins static void 89419059a13SJohn Baldwin linux32_fixlimit(struct rlimit *rl, int which) 895ea0fabbcSTim J. Robbins { 896ea0fabbcSTim J. Robbins 89719059a13SJohn Baldwin switch (which) { 89819059a13SJohn Baldwin case RLIMIT_DATA: 899ea0fabbcSTim J. Robbins if (linux32_maxdsiz != 0) { 90019059a13SJohn Baldwin if (rl->rlim_cur > linux32_maxdsiz) 90119059a13SJohn Baldwin rl->rlim_cur = linux32_maxdsiz; 90219059a13SJohn Baldwin if (rl->rlim_max > linux32_maxdsiz) 90319059a13SJohn Baldwin rl->rlim_max = linux32_maxdsiz; 904ea0fabbcSTim J. Robbins } 90519059a13SJohn Baldwin break; 90619059a13SJohn Baldwin case RLIMIT_STACK: 907ea0fabbcSTim J. Robbins if (linux32_maxssiz != 0) { 90819059a13SJohn Baldwin if (rl->rlim_cur > linux32_maxssiz) 90919059a13SJohn Baldwin rl->rlim_cur = linux32_maxssiz; 91019059a13SJohn Baldwin if (rl->rlim_max > linux32_maxssiz) 91119059a13SJohn Baldwin rl->rlim_max = linux32_maxssiz; 912ea0fabbcSTim J. Robbins } 91319059a13SJohn Baldwin break; 91419059a13SJohn Baldwin case RLIMIT_VMEM: 915ea0fabbcSTim J. Robbins if (linux32_maxvmem != 0) { 91619059a13SJohn Baldwin if (rl->rlim_cur > linux32_maxvmem) 91719059a13SJohn Baldwin rl->rlim_cur = linux32_maxvmem; 91819059a13SJohn Baldwin if (rl->rlim_max > linux32_maxvmem) 91919059a13SJohn Baldwin rl->rlim_max = linux32_maxvmem; 920ea0fabbcSTim J. Robbins } 92119059a13SJohn Baldwin break; 92219059a13SJohn Baldwin } 923ea0fabbcSTim J. Robbins } 924ea0fabbcSTim J. Robbins 925ea0fabbcSTim J. Robbins struct sysentvec elf_linux_sysvec = { 9262f99bcceSJohn Baldwin .sv_size = LINUX32_SYS_MAXSYSCALL, 9272f99bcceSJohn Baldwin .sv_table = linux32_sysent, 928dc858467SEd Maste .sv_transtrap = linux_translate_traps, 929dc858467SEd Maste .sv_fixup = linux_fixup_elf, 930a8d403e1SKonstantin Belousov .sv_sendsig = linux_sendsig, 9319931033bSDmitry Chagin .sv_sigcode = &_binary_linux32_vdso_so_o_start, 932a8d403e1SKonstantin Belousov .sv_szsigcode = &linux_szsigcode, 933a8d403e1SKonstantin Belousov .sv_name = "Linux ELF32", 934a8d403e1SKonstantin Belousov .sv_coredump = elf32_coredump, 935447636e4SEdward Tomasz Napierala .sv_elf_core_osabi = ELFOSABI_NONE, 936447636e4SEdward Tomasz Napierala .sv_elf_core_abi_vendor = LINUX_ABI_VENDOR, 937447636e4SEdward Tomasz Napierala .sv_elf_core_prepare_notes = linux32_prepare_notes, 938dc858467SEd Maste .sv_imgact_try = linux_exec_imgact_try, 939a8d403e1SKonstantin Belousov .sv_minsigstksz = LINUX_MINSIGSTKSZ, 940a8d403e1SKonstantin Belousov .sv_minuser = VM_MIN_ADDRESS, 9418f1e49a6SDmitry Chagin .sv_maxuser = LINUX32_MAXUSER, 942a8d403e1SKonstantin Belousov .sv_usrstack = LINUX32_USRSTACK, 943a8d403e1SKonstantin Belousov .sv_psstrings = LINUX32_PS_STRINGS, 9443fc21fddSMark Johnston .sv_psstringssz = sizeof(struct linux32_ps_strings), 945a8d403e1SKonstantin Belousov .sv_stackprot = VM_PROT_ALL, 9465caa67faSJohn Baldwin .sv_copyout_auxargs = linux_copyout_auxargs, 947a8d403e1SKonstantin Belousov .sv_copyout_strings = linux_copyout_strings, 948dc858467SEd Maste .sv_setregs = linux_exec_setregs, 949a8d403e1SKonstantin Belousov .sv_fixlimit = linux32_fixlimit, 950a8d403e1SKonstantin Belousov .sv_maxssiz = &linux32_maxssiz, 951870e197dSKonstantin Belousov .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP | 9529931033bSDmitry Chagin SV_SIG_DISCIGN | SV_SIG_WAITNDQ | SV_TIMEKEEP, 953c26391f4SEdward Tomasz Napierala .sv_set_syscall_retval = linux32_set_syscall_retval, 954afe1a688SKonstantin Belousov .sv_fetch_syscall_args = linux32_fetch_syscall_args, 955afe1a688SKonstantin Belousov .sv_syscallnames = NULL, 9568f1e49a6SDmitry Chagin .sv_shared_page_base = LINUX32_SHAREDPAGE, 9578f1e49a6SDmitry Chagin .sv_shared_page_len = PAGE_SIZE, 958e5d81ef1SDmitry Chagin .sv_schedtail = linux_schedtail, 95981338031SDmitry Chagin .sv_thread_detach = linux_thread_detach, 960038c7205SDmitry Chagin .sv_trap = NULL, 9615fd9cd53SDmitry Chagin .sv_onexec = linux_on_exec_vmspace, 9624815f175SKonstantin Belousov .sv_onexit = linux_on_exit, 9634815f175SKonstantin Belousov .sv_ontdexit = linux_thread_dtor, 964598f6fb4SKonstantin Belousov .sv_setid_allowed = &linux_setid_allowed_query, 965de8374dfSDmitry Chagin .sv_set_fork_retval = linux32_set_fork_retval, 966ea0fabbcSTim J. Robbins }; 967bdc37934SDmitry Chagin 9685fd9cd53SDmitry Chagin static int 9695fd9cd53SDmitry Chagin linux_on_exec_vmspace(struct proc *p, struct image_params *imgp) 9705fd9cd53SDmitry Chagin { 9719931033bSDmitry Chagin int error; 9725fd9cd53SDmitry Chagin 9739931033bSDmitry Chagin error = linux_map_vdso(p, linux_vdso_obj, linux_vdso_base, 9749931033bSDmitry Chagin LINUX32_VDSOPAGE_SIZE, imgp); 9759931033bSDmitry Chagin if (error == 0) 9765fd9cd53SDmitry Chagin linux_on_exec(p, imgp); 9779931033bSDmitry Chagin return (error); 9785fd9cd53SDmitry Chagin } 9795fd9cd53SDmitry Chagin 98009cffde9SDmitry Chagin /* 98109cffde9SDmitry Chagin * linux_vdso_install() and linux_exec_sysvec_init() must be called 98209cffde9SDmitry Chagin * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY). 98309cffde9SDmitry Chagin */ 984bdc37934SDmitry Chagin static void 9859931033bSDmitry Chagin linux_exec_sysvec_init(void *param) 9869931033bSDmitry Chagin { 9879931033bSDmitry Chagin l_uintptr_t *ktimekeep_base, *ktsc_selector; 9889931033bSDmitry Chagin struct sysentvec *sv; 9899931033bSDmitry Chagin ptrdiff_t tkoff; 9909931033bSDmitry Chagin 9919931033bSDmitry Chagin sv = param; 9929931033bSDmitry Chagin /* Fill timekeep_base */ 9939931033bSDmitry Chagin exec_sysvec_init(sv); 9949931033bSDmitry Chagin 9959931033bSDmitry Chagin tkoff = kern_timekeep_base - linux_vdso_base; 9969931033bSDmitry Chagin ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 9979931033bSDmitry Chagin *ktimekeep_base = sv->sv_timekeep_base; 9989931033bSDmitry Chagin 9999931033bSDmitry Chagin tkoff = kern_tsc_selector - linux_vdso_base; 10009931033bSDmitry Chagin ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 10019931033bSDmitry Chagin *ktsc_selector = linux_vdso_tsc_selector_idx(); 10029931033bSDmitry Chagin if (bootverbose) 10039931033bSDmitry Chagin printf("Linux i386 vDSO tsc_selector: %u\n", *ktsc_selector); 1004*5a6a4fb2SDmitry Chagin 1005*5a6a4fb2SDmitry Chagin tkoff = kern_cpu_selector - linux_vdso_base; 1006*5a6a4fb2SDmitry Chagin ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 1007*5a6a4fb2SDmitry Chagin *ktsc_selector = linux_vdso_cpu_selector_idx(); 1008*5a6a4fb2SDmitry Chagin if (bootverbose) 1009*5a6a4fb2SDmitry Chagin printf("Linux i386 vDSO cpu_selector: %u\n", *ktsc_selector); 10109931033bSDmitry Chagin } 101109cffde9SDmitry Chagin SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY, 10129931033bSDmitry Chagin linux_exec_sysvec_init, &elf_linux_sysvec); 10139931033bSDmitry Chagin 10149931033bSDmitry Chagin static void 1015a543556cSDmitry Chagin linux_vdso_install(const void *param) 1016bdc37934SDmitry Chagin { 10179931033bSDmitry Chagin char *vdso_start = &_binary_linux32_vdso_so_o_start; 10189931033bSDmitry Chagin char *vdso_end = &_binary_linux32_vdso_so_o_end; 1019bdc37934SDmitry Chagin 10209931033bSDmitry Chagin linux_szsigcode = vdso_end - vdso_start; 10219931033bSDmitry Chagin MPASS(linux_szsigcode <= LINUX32_VDSOPAGE_SIZE); 1022bdc37934SDmitry Chagin 10239931033bSDmitry Chagin linux_vdso_base = LINUX32_VDSOPAGE; 1024bdc37934SDmitry Chagin 10259931033bSDmitry Chagin __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base); 1026bdc37934SDmitry Chagin 10279931033bSDmitry Chagin linux_vdso_obj = __elfN(linux_shared_page_init) 10289931033bSDmitry Chagin (&linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE); 10299931033bSDmitry Chagin bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode); 1030bdc37934SDmitry Chagin 10319931033bSDmitry Chagin linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base); 1032bdc37934SDmitry Chagin } 103309cffde9SDmitry Chagin SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST, 1034f8268d4dSEd Maste linux_vdso_install, NULL); 1035bdc37934SDmitry Chagin 1036bdc37934SDmitry Chagin static void 1037a543556cSDmitry Chagin linux_vdso_deinstall(const void *param) 1038bdc37934SDmitry Chagin { 1039bdc37934SDmitry Chagin 10409931033bSDmitry Chagin __elfN(linux_shared_page_fini)(linux_vdso_obj, 10419931033bSDmitry Chagin linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE); 10427b194b3dSEd Maste } 1043bdc37934SDmitry Chagin SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 1044f8268d4dSEd Maste linux_vdso_deinstall, NULL); 1045ea0fabbcSTim J. Robbins 10469931033bSDmitry Chagin static void 10479931033bSDmitry Chagin linux_vdso_reloc(char *mapping, Elf_Addr offset) 10489931033bSDmitry Chagin { 10499931033bSDmitry Chagin const Elf_Shdr *shdr; 10509931033bSDmitry Chagin const Elf_Rel *rel; 10519931033bSDmitry Chagin const Elf_Ehdr *ehdr; 10529931033bSDmitry Chagin Elf32_Addr *where; 10539931033bSDmitry Chagin Elf_Size rtype, symidx; 10549931033bSDmitry Chagin Elf32_Addr addr, addend; 10559931033bSDmitry Chagin int i, relcnt; 10569931033bSDmitry Chagin 10579931033bSDmitry Chagin MPASS(offset != 0); 10589931033bSDmitry Chagin 10599931033bSDmitry Chagin relcnt = 0; 10609931033bSDmitry Chagin ehdr = (const Elf_Ehdr *)mapping; 10619931033bSDmitry Chagin shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff); 10629931033bSDmitry Chagin for (i = 0; i < ehdr->e_shnum; i++) 10639931033bSDmitry Chagin { 10649931033bSDmitry Chagin switch (shdr[i].sh_type) { 10659931033bSDmitry Chagin case SHT_REL: 10669931033bSDmitry Chagin rel = (const Elf_Rel *)(mapping + shdr[i].sh_offset); 10679931033bSDmitry Chagin relcnt = shdr[i].sh_size / sizeof(*rel); 10689931033bSDmitry Chagin break; 10699931033bSDmitry Chagin case SHT_RELA: 10709931033bSDmitry Chagin printf("Linux i386 vDSO: unexpected Rela section\n"); 10719931033bSDmitry Chagin break; 10729931033bSDmitry Chagin } 10739931033bSDmitry Chagin } 10749931033bSDmitry Chagin 10759931033bSDmitry Chagin for (i = 0; i < relcnt; i++, rel++) { 10769931033bSDmitry Chagin where = (Elf32_Addr *)(mapping + rel->r_offset); 10779931033bSDmitry Chagin addend = *where; 10789931033bSDmitry Chagin rtype = ELF_R_TYPE(rel->r_info); 10799931033bSDmitry Chagin symidx = ELF_R_SYM(rel->r_info); 10809931033bSDmitry Chagin 10819931033bSDmitry Chagin switch (rtype) { 10829931033bSDmitry Chagin case R_386_NONE: /* none */ 10839931033bSDmitry Chagin break; 10849931033bSDmitry Chagin 10859931033bSDmitry Chagin case R_386_RELATIVE: /* B + A */ 10869931033bSDmitry Chagin addr = (Elf32_Addr)PTROUT(offset + addend); 10879931033bSDmitry Chagin if (*where != addr) 10889931033bSDmitry Chagin *where = addr; 10899931033bSDmitry Chagin break; 10909931033bSDmitry Chagin 10919931033bSDmitry Chagin case R_386_IRELATIVE: 10929931033bSDmitry Chagin printf("Linux i386 vDSO: unexpected ifunc relocation, " 10939931033bSDmitry Chagin "symbol index %ld\n", (intmax_t)symidx); 10949931033bSDmitry Chagin break; 10959931033bSDmitry Chagin default: 10969931033bSDmitry Chagin printf("Linux i386 vDSO: unexpected relocation type %ld, " 10979931033bSDmitry Chagin "symbol index %ld\n", (intmax_t)rtype, (intmax_t)symidx); 10989931033bSDmitry Chagin } 10999931033bSDmitry Chagin } 11009931033bSDmitry Chagin } 11019931033bSDmitry Chagin 110289ffc202SBjoern A. Zeeb static char GNU_ABI_VENDOR[] = "GNU"; 110389ffc202SBjoern A. Zeeb static int GNULINUX_ABI_DESC = 0; 110489ffc202SBjoern A. Zeeb 1105a95659f7SEd Maste static bool 110689ffc202SBjoern A. Zeeb linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 110789ffc202SBjoern A. Zeeb { 110889ffc202SBjoern A. Zeeb const Elf32_Word *desc; 110989ffc202SBjoern A. Zeeb uintptr_t p; 111089ffc202SBjoern A. Zeeb 111189ffc202SBjoern A. Zeeb p = (uintptr_t)(note + 1); 111289ffc202SBjoern A. Zeeb p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 111389ffc202SBjoern A. Zeeb 111489ffc202SBjoern A. Zeeb desc = (const Elf32_Word *)p; 111589ffc202SBjoern A. Zeeb if (desc[0] != GNULINUX_ABI_DESC) 1116a95659f7SEd Maste return (false); 111789ffc202SBjoern A. Zeeb 111889ffc202SBjoern A. Zeeb /* 111935755049SChuck Tuffli * For Linux we encode osrel using the Linux convention of 112035755049SChuck Tuffli * (version << 16) | (major << 8) | (minor) 112135755049SChuck Tuffli * See macro in linux_mib.h 112289ffc202SBjoern A. Zeeb */ 112335755049SChuck Tuffli *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 112489ffc202SBjoern A. Zeeb 1125a95659f7SEd Maste return (true); 112689ffc202SBjoern A. Zeeb } 112732c01de2SDmitry Chagin 112832c01de2SDmitry Chagin static Elf_Brandnote linux32_brandnote = { 112989ffc202SBjoern A. Zeeb .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 113089ffc202SBjoern A. Zeeb .hdr.n_descsz = 16, /* XXX at least 16 */ 113132c01de2SDmitry Chagin .hdr.n_type = 1, 113289ffc202SBjoern A. Zeeb .vendor = GNU_ABI_VENDOR, 113389ffc202SBjoern A. Zeeb .flags = BN_TRANSLATE_OSREL, 113489ffc202SBjoern A. Zeeb .trans_osrel = linux32_trans_osrel 113532c01de2SDmitry Chagin }; 113632c01de2SDmitry Chagin 1137ea0fabbcSTim J. Robbins static Elf32_Brandinfo linux_brand = { 1138a8d403e1SKonstantin Belousov .brand = ELFOSABI_LINUX, 1139a8d403e1SKonstantin Belousov .machine = EM_386, 1140a8d403e1SKonstantin Belousov .compat_3_brand = "Linux", 1141b5f20658SEdward Tomasz Napierala .emul_path = linux_emul_path, 1142a8d403e1SKonstantin Belousov .interp_path = "/lib/ld-linux.so.1", 1143a8d403e1SKonstantin Belousov .sysvec = &elf_linux_sysvec, 1144a8d403e1SKonstantin Belousov .interp_newpath = NULL, 114532c01de2SDmitry Chagin .brand_note = &linux32_brandnote, 11462dedc128SDmitry Chagin .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1147ea0fabbcSTim J. Robbins }; 1148ea0fabbcSTim J. Robbins 1149ea0fabbcSTim J. Robbins static Elf32_Brandinfo linux_glibc2brand = { 1150a8d403e1SKonstantin Belousov .brand = ELFOSABI_LINUX, 1151a8d403e1SKonstantin Belousov .machine = EM_386, 1152a8d403e1SKonstantin Belousov .compat_3_brand = "Linux", 1153b5f20658SEdward Tomasz Napierala .emul_path = linux_emul_path, 1154a8d403e1SKonstantin Belousov .interp_path = "/lib/ld-linux.so.2", 1155a8d403e1SKonstantin Belousov .sysvec = &elf_linux_sysvec, 1156a8d403e1SKonstantin Belousov .interp_newpath = NULL, 115732c01de2SDmitry Chagin .brand_note = &linux32_brandnote, 11582dedc128SDmitry Chagin .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1159ea0fabbcSTim J. Robbins }; 1160ea0fabbcSTim J. Robbins 1161a0c59c7aSDmitry Chagin static Elf32_Brandinfo linux_muslbrand = { 1162a0c59c7aSDmitry Chagin .brand = ELFOSABI_LINUX, 1163a0c59c7aSDmitry Chagin .machine = EM_386, 1164a0c59c7aSDmitry Chagin .compat_3_brand = "Linux", 1165b5f20658SEdward Tomasz Napierala .emul_path = linux_emul_path, 1166a0c59c7aSDmitry Chagin .interp_path = "/lib/ld-musl-i386.so.1", 1167a0c59c7aSDmitry Chagin .sysvec = &elf_linux_sysvec, 1168a0c59c7aSDmitry Chagin .interp_newpath = NULL, 1169a0c59c7aSDmitry Chagin .brand_note = &linux32_brandnote, 1170cf8d74e3SDmitry Chagin .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE | 1171cf8d74e3SDmitry Chagin LINUX_BI_FUTEX_REQUEUE 1172a0c59c7aSDmitry Chagin }; 1173a0c59c7aSDmitry Chagin 1174ea0fabbcSTim J. Robbins Elf32_Brandinfo *linux_brandlist[] = { 1175ea0fabbcSTim J. Robbins &linux_brand, 1176ea0fabbcSTim J. Robbins &linux_glibc2brand, 1177a0c59c7aSDmitry Chagin &linux_muslbrand, 1178ea0fabbcSTim J. Robbins NULL 1179ea0fabbcSTim J. Robbins }; 1180ea0fabbcSTim J. Robbins 1181ea0fabbcSTim J. Robbins static int 1182ea0fabbcSTim J. Robbins linux_elf_modevent(module_t mod, int type, void *data) 1183ea0fabbcSTim J. Robbins { 1184ea0fabbcSTim J. Robbins Elf32_Brandinfo **brandinfo; 1185ea0fabbcSTim J. Robbins int error; 1186ea0fabbcSTim J. Robbins struct linux_ioctl_handler **lihp; 1187ea0fabbcSTim J. Robbins 1188ea0fabbcSTim J. Robbins error = 0; 1189ea0fabbcSTim J. Robbins 1190ea0fabbcSTim J. Robbins switch(type) { 1191ea0fabbcSTim J. Robbins case MOD_LOAD: 1192ea0fabbcSTim J. Robbins for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1193ea0fabbcSTim J. Robbins ++brandinfo) 1194ea0fabbcSTim J. Robbins if (elf32_insert_brand_entry(*brandinfo) < 0) 1195ea0fabbcSTim J. Robbins error = EINVAL; 1196ea0fabbcSTim J. Robbins if (error == 0) { 1197ea0fabbcSTim J. Robbins SET_FOREACH(lihp, linux_ioctl_handler_set) 11988fc08087STijl Coosemans linux32_ioctl_register_handler(*lihp); 11991ca16454SDmitry Chagin stclohz = (stathz ? stathz : hz); 1200ea0fabbcSTim J. Robbins if (bootverbose) 1201ae8330b4SDmitry Chagin printf("Linux i386 ELF exec handler installed\n"); 1202ea0fabbcSTim J. Robbins } else 1203ae8330b4SDmitry Chagin printf("cannot insert Linux i386 ELF brand handler\n"); 1204ea0fabbcSTim J. Robbins break; 1205ea0fabbcSTim J. Robbins case MOD_UNLOAD: 1206ea0fabbcSTim J. Robbins for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1207ea0fabbcSTim J. Robbins ++brandinfo) 1208ea0fabbcSTim J. Robbins if (elf32_brand_inuse(*brandinfo)) 1209ea0fabbcSTim J. Robbins error = EBUSY; 1210ea0fabbcSTim J. Robbins if (error == 0) { 1211ea0fabbcSTim J. Robbins for (brandinfo = &linux_brandlist[0]; 1212ea0fabbcSTim J. Robbins *brandinfo != NULL; ++brandinfo) 1213ea0fabbcSTim J. Robbins if (elf32_remove_brand_entry(*brandinfo) < 0) 1214ea0fabbcSTim J. Robbins error = EINVAL; 1215ea0fabbcSTim J. Robbins } 1216ea0fabbcSTim J. Robbins if (error == 0) { 1217ea0fabbcSTim J. Robbins SET_FOREACH(lihp, linux_ioctl_handler_set) 12188fc08087STijl Coosemans linux32_ioctl_unregister_handler(*lihp); 1219ea0fabbcSTim J. Robbins if (bootverbose) 1220ae8330b4SDmitry Chagin printf("Linux i386 ELF exec handler removed\n"); 1221ea0fabbcSTim J. Robbins } else 1222ae8330b4SDmitry Chagin printf("Could not deinstall Linux i386 ELF interpreter entry\n"); 1223ea0fabbcSTim J. Robbins break; 1224ea0fabbcSTim J. Robbins default: 1225af682d48SDmitry Chagin return (EOPNOTSUPP); 1226ea0fabbcSTim J. Robbins } 1227af682d48SDmitry Chagin return (error); 1228ea0fabbcSTim J. Robbins } 1229ea0fabbcSTim J. Robbins 1230ea0fabbcSTim J. Robbins static moduledata_t linux_elf_mod = { 1231ea0fabbcSTim J. Robbins "linuxelf", 1232ea0fabbcSTim J. Robbins linux_elf_modevent, 12339823d527SKevin Lo 0 1234ea0fabbcSTim J. Robbins }; 1235ea0fabbcSTim J. Robbins 123678ae4338SKonstantin Belousov DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 123767d39748SDmitry Chagin MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1); 1238b6348be7SBaptiste Daroussin FEATURE(linux, "Linux 32bit support"); 1239