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 9421f24617SDmitry Chagin #include <x86/linux/linux_x86_sigframe.h> 9521f24617SDmitry Chagin 96ea0fabbcSTim J. Robbins MODULE_VERSION(linux, 1); 97ea0fabbcSTim J. Robbins 984aae1334SDmitry Chagin #define LINUX32_MAXUSER ((1ul << 32) - PAGE_SIZE) 999931033bSDmitry Chagin #define LINUX32_VDSOPAGE_SIZE PAGE_SIZE * 2 1009931033bSDmitry Chagin #define LINUX32_VDSOPAGE (LINUX32_MAXUSER - LINUX32_VDSOPAGE_SIZE) 1019931033bSDmitry Chagin #define LINUX32_SHAREDPAGE (LINUX32_VDSOPAGE - PAGE_SIZE) 1029931033bSDmitry Chagin /* 1039931033bSDmitry Chagin * PAGE_SIZE - the size 1049931033bSDmitry Chagin * of the native SHAREDPAGE 1059931033bSDmitry Chagin */ 1064aae1334SDmitry Chagin #define LINUX32_USRSTACK LINUX32_SHAREDPAGE 1074aae1334SDmitry Chagin 108bdc37934SDmitry Chagin static int linux_szsigcode; 1099931033bSDmitry Chagin static vm_object_t linux_vdso_obj; 1109931033bSDmitry Chagin static char *linux_vdso_mapping; 1119931033bSDmitry Chagin extern char _binary_linux32_vdso_so_o_start; 1129931033bSDmitry Chagin extern char _binary_linux32_vdso_so_o_end; 1139931033bSDmitry Chagin static vm_offset_t linux_vdso_base; 114ea0fabbcSTim J. Robbins 1152f99bcceSJohn Baldwin extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL]; 116ea0fabbcSTim J. Robbins 117ea0fabbcSTim J. Robbins SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 118ea0fabbcSTim J. Robbins 11931174518SJohn Baldwin static int linux_fixup_elf(uintptr_t *stack_base, 120ea0fabbcSTim J. Robbins struct image_params *iparams); 12103b0d68cSJohn Baldwin static int linux_copyout_strings(struct image_params *imgp, 12231174518SJohn Baldwin uintptr_t *stack_base); 1239104847fSDavid Xu static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 124dc858467SEd Maste static void linux_exec_setregs(struct thread *td, 12531174518SJohn Baldwin struct image_params *imgp, uintptr_t stack); 1269931033bSDmitry Chagin static void linux_exec_sysvec_init(void *param); 1275fd9cd53SDmitry Chagin static int linux_on_exec_vmspace(struct proc *p, 1285fd9cd53SDmitry Chagin struct image_params *imgp); 12919059a13SJohn Baldwin static void linux32_fixlimit(struct rlimit *rl, int which); 130a95659f7SEd Maste static bool linux32_trans_osrel(const Elf_Note *note, int32_t *osrel); 131a543556cSDmitry Chagin static void linux_vdso_install(const void *param); 132a543556cSDmitry Chagin static void linux_vdso_deinstall(const void *param); 1339931033bSDmitry Chagin static void linux_vdso_reloc(char *mapping, Elf_Addr offset); 134de8374dfSDmitry Chagin static void linux32_set_fork_retval(struct thread *td); 135c26391f4SEdward Tomasz Napierala static void linux32_set_syscall_retval(struct thread *td, int error); 136ea0fabbcSTim J. Robbins 137ea0fabbcSTim J. Robbins struct linux32_ps_strings { 138ea0fabbcSTim J. Robbins u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 139f2c7668eSDavid Schultz u_int ps_nargvstr; /* the number of argument strings */ 140ea0fabbcSTim J. Robbins u_int32_t ps_envstr; /* first of 0 or more environment strings */ 141f2c7668eSDavid Schultz u_int ps_nenvstr; /* the number of environment strings */ 142ea0fabbcSTim J. Robbins }; 1434aae1334SDmitry Chagin #define LINUX32_PS_STRINGS (LINUX32_USRSTACK - \ 1444aae1334SDmitry Chagin sizeof(struct linux32_ps_strings)) 145ea0fabbcSTim J. Robbins 1469931033bSDmitry Chagin LINUX_VDSO_SYM_INTPTR(__kernel_vsyscall); 1478f9635dcSDmitry Chagin LINUX_VDSO_SYM_INTPTR(linux32_vdso_sigcode); 1488f9635dcSDmitry Chagin LINUX_VDSO_SYM_INTPTR(linux32_vdso_rt_sigcode); 1499931033bSDmitry Chagin LINUX_VDSO_SYM_INTPTR(kern_timekeep_base); 1509931033bSDmitry Chagin LINUX_VDSO_SYM_INTPTR(kern_tsc_selector); 1515a6a4fb2SDmitry Chagin LINUX_VDSO_SYM_INTPTR(kern_cpu_selector); 1520020bdf1SDmitry Chagin LINUX_VDSO_SYM_CHAR(linux_platform); 153bdc37934SDmitry Chagin 15403b0d68cSJohn Baldwin static int 155d8010b11SJohn Baldwin linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) 156ea0fabbcSTim J. Robbins { 157ea0fabbcSTim J. Robbins Elf32_Auxargs *args; 1585f77b8a8SBrooks Davis Elf32_Auxinfo *argarray, *pos; 15903b0d68cSJohn Baldwin int error, issetugid; 1604d7c2e8aSDmitry Chagin 161ea0fabbcSTim J. Robbins args = (Elf32_Auxargs *)imgp->auxargs; 1625f77b8a8SBrooks Davis argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 1635f77b8a8SBrooks Davis M_WAITOK | M_ZERO); 164ea0fabbcSTim J. Robbins 165669414e4SXin LI issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 1669931033bSDmitry Chagin AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall); 1679931033bSDmitry Chagin AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base); 1685f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 169ca6e1fa3SEdward Tomasz Napierala AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1708d30f381SDmitry Chagin 1718d30f381SDmitry Chagin /* 1728d30f381SDmitry Chagin * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 1738d30f381SDmitry Chagin * as it has appeared in the 2.4.0-rc7 first time. 1748d30f381SDmitry Chagin * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 1758d30f381SDmitry Chagin * glibc falls back to the hard-coded CLK_TCK value when aux entry 1768d30f381SDmitry Chagin * is not present. 1778d30f381SDmitry Chagin * Also see linux_times() implementation. 1788d30f381SDmitry Chagin */ 1798d30f381SDmitry Chagin if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 1805f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 1815f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1825f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1835f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 184ca6e1fa3SEdward Tomasz Napierala AUXARGS_ENTRY(pos, AT_BASE, args->base); 1855f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1865f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1875f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 1885f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 1895f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 1905f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 191ca6e1fa3SEdward Tomasz Napierala AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 1924048f59cSDmitry Chagin AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary)); 193ca6e1fa3SEdward Tomasz Napierala AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, 0); 1944048f59cSDmitry Chagin if (imgp->execpathp != 0) 1954048f59cSDmitry Chagin AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp)); 1964d7c2e8aSDmitry Chagin if (args->execfd != -1) 1975f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 198ca6e1fa3SEdward Tomasz Napierala AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 1995f77b8a8SBrooks Davis AUXARGS_ENTRY(pos, AT_NULL, 0); 200ea0fabbcSTim J. Robbins 201ea0fabbcSTim J. Robbins free(imgp->auxargs, M_TEMP); 202ea0fabbcSTim J. Robbins imgp->auxargs = NULL; 2036362b1a6SJung-uk Kim KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 2045f77b8a8SBrooks Davis 205d8010b11SJohn Baldwin error = copyout(argarray, (void *)base, 206d8010b11SJohn Baldwin sizeof(*argarray) * LINUX_AT_COUNT); 2075f77b8a8SBrooks Davis free(argarray, M_TEMP); 20803b0d68cSJohn Baldwin return (error); 2095caa67faSJohn Baldwin } 210ea0fabbcSTim J. Robbins 2115caa67faSJohn Baldwin static int 21231174518SJohn Baldwin linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp) 2135caa67faSJohn Baldwin { 2145caa67faSJohn Baldwin Elf32_Addr *base; 2155caa67faSJohn Baldwin 2165caa67faSJohn Baldwin base = (Elf32_Addr *)*stack_base; 217ea0fabbcSTim J. Robbins base--; 2185f77b8a8SBrooks Davis if (suword32(base, (uint32_t)imgp->args->argc) == -1) 2195f77b8a8SBrooks Davis return (EFAULT); 22031174518SJohn Baldwin *stack_base = (uintptr_t)base; 221af682d48SDmitry Chagin return (0); 222ea0fabbcSTim J. Robbins } 223ea0fabbcSTim J. Robbins 224ea0fabbcSTim J. Robbins static void 2259104847fSDavid Xu linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 226ea0fabbcSTim J. Robbins { 227ea0fabbcSTim J. Robbins struct thread *td = curthread; 228ea0fabbcSTim J. Robbins struct proc *p = td->td_proc; 229ea0fabbcSTim J. Robbins struct sigacts *psp; 230ea0fabbcSTim J. Robbins struct trapframe *regs; 231ea0fabbcSTim J. Robbins struct l_rt_sigframe *fp, frame; 232ea0fabbcSTim J. Robbins int oonstack; 2339104847fSDavid Xu int sig; 2349104847fSDavid Xu int code; 235ea0fabbcSTim J. Robbins 236eca368ecSDmitry Chagin sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno); 2379104847fSDavid Xu code = ksi->ksi_code; 238ea0fabbcSTim J. Robbins PROC_LOCK_ASSERT(p, MA_OWNED); 239ea0fabbcSTim J. Robbins psp = p->p_sigacts; 240ea0fabbcSTim J. Robbins mtx_assert(&psp->ps_mtx, MA_OWNED); 241ea0fabbcSTim J. Robbins regs = td->td_frame; 242ea0fabbcSTim J. Robbins oonstack = sigonstack(regs->tf_rsp); 243ea0fabbcSTim J. Robbins 2444ba25759SEd Maste /* Allocate space for the signal handler context. */ 245ea0fabbcSTim J. Robbins if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 246ea0fabbcSTim J. Robbins SIGISMEMBER(psp->ps_sigonstack, sig)) { 247aa949be5SJohn Baldwin fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 248ea0fabbcSTim J. Robbins td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 249ea0fabbcSTim J. Robbins } else 250ea0fabbcSTim J. Robbins fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 251ea0fabbcSTim J. Robbins mtx_unlock(&psp->ps_mtx); 252ea0fabbcSTim J. Robbins 2534ba25759SEd Maste /* Build the argument list for the signal handler. */ 2544ab7403bSDmitry Chagin sig = bsd_to_linux_signal(sig); 255ea0fabbcSTim J. Robbins 256ea0fabbcSTim J. Robbins bzero(&frame, sizeof(frame)); 257ea0fabbcSTim J. Robbins 258ea0fabbcSTim J. Robbins frame.sf_sig = sig; 259ea0fabbcSTim J. Robbins frame.sf_siginfo = PTROUT(&fp->sf_si); 2606e826d27SDmitry Chagin frame.sf_ucontext = PTROUT(&fp->sf_uc); 261ea0fabbcSTim J. Robbins 2624ba25759SEd Maste /* Fill in POSIX parts. */ 263f4e80108SDmitry Chagin siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig); 264ea0fabbcSTim J. Robbins 265ea0fabbcSTim J. Robbins /* 2664ba25759SEd Maste * Build the signal context to be used by sigreturn and libgcc unwind. 267ea0fabbcSTim J. Robbins */ 2686e826d27SDmitry Chagin frame.sf_uc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 2696e826d27SDmitry Chagin frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 2706e826d27SDmitry Chagin frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 271ea0fabbcSTim J. Robbins ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 272ea0fabbcSTim J. Robbins PROC_UNLOCK(p); 273ea0fabbcSTim J. Robbins 2746e826d27SDmitry Chagin bsd_to_linux_sigset(mask, &frame.sf_uc.uc_sigmask); 275ea0fabbcSTim J. Robbins 2766e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_mask = frame.sf_uc.uc_sigmask.__mask; 2776e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_edi = regs->tf_rdi; 2786e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_esi = regs->tf_rsi; 2796e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_ebp = regs->tf_rbp; 2806e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_ebx = regs->tf_rbx; 2816e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_esp = regs->tf_rsp; 2826e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_edx = regs->tf_rdx; 2836e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_ecx = regs->tf_rcx; 2846e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_eax = regs->tf_rax; 2856e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_eip = regs->tf_rip; 2866e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_cs = regs->tf_cs; 2876e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_gs = regs->tf_gs; 2886e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_fs = regs->tf_fs; 2896e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_es = regs->tf_es; 2906e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_ds = regs->tf_ds; 2916e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_eflags = regs->tf_rflags; 2926e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 2936e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_ss = regs->tf_ss; 2946e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_err = regs->tf_err; 2956e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 2966e826d27SDmitry Chagin frame.sf_uc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 297ea0fabbcSTim J. Robbins 298ea0fabbcSTim J. Robbins if (copyout(&frame, fp, sizeof(frame)) != 0) { 299ea0fabbcSTim J. Robbins /* 300ea0fabbcSTim J. Robbins * Process has trashed its stack; give it an illegal 301ea0fabbcSTim J. Robbins * instruction to halt it in its tracks. 302ea0fabbcSTim J. Robbins */ 303ea0fabbcSTim J. Robbins PROC_LOCK(p); 304ea0fabbcSTim J. Robbins sigexit(td, SIGILL); 305ea0fabbcSTim J. Robbins } 306ea0fabbcSTim J. Robbins 3074ba25759SEd Maste /* Build context to run handler in. */ 308ea0fabbcSTim J. Robbins regs->tf_rsp = PTROUT(fp); 3098f9635dcSDmitry Chagin regs->tf_rip = linux32_vdso_rt_sigcode; 310ba279bcdSDmitry Chagin regs->tf_rdi = PTROUT(catcher); 31122eca0bfSKonstantin Belousov regs->tf_rflags &= ~(PSL_T | PSL_D); 312ea0fabbcSTim J. Robbins regs->tf_cs = _ucode32sel; 313ea0fabbcSTim J. Robbins regs->tf_ss = _udatasel; 3142c66cccaSKonstantin Belousov regs->tf_ds = _udatasel; 3152c66cccaSKonstantin Belousov regs->tf_es = _udatasel; 3162c66cccaSKonstantin Belousov regs->tf_fs = _ufssel; 3172c66cccaSKonstantin Belousov regs->tf_gs = _ugssel; 3182c66cccaSKonstantin Belousov regs->tf_flags = TF_HASSEGS; 319e6c006d9SJung-uk Kim set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 320ea0fabbcSTim J. Robbins PROC_LOCK(p); 321ea0fabbcSTim J. Robbins mtx_lock(&psp->ps_mtx); 322ea0fabbcSTim J. Robbins } 323ea0fabbcSTim J. Robbins 324ea0fabbcSTim J. Robbins /* 325ea0fabbcSTim J. Robbins * Send an interrupt to process. 326ea0fabbcSTim J. Robbins * 327ea0fabbcSTim J. Robbins * Stack is set up to allow sigcode stored 328ea0fabbcSTim J. Robbins * in u. to call routine, followed by kcall 329ea0fabbcSTim J. Robbins * to sigreturn routine below. After sigreturn 330ea0fabbcSTim J. Robbins * resets the signal mask, the stack, and the 331ea0fabbcSTim J. Robbins * frame pointer, it returns to the user 332ea0fabbcSTim J. Robbins * specified pc, psl. 333ea0fabbcSTim J. Robbins */ 334ea0fabbcSTim J. Robbins static void 3359104847fSDavid Xu linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 336ea0fabbcSTim J. Robbins { 337ea0fabbcSTim J. Robbins struct thread *td = curthread; 338ea0fabbcSTim J. Robbins struct proc *p = td->td_proc; 339ea0fabbcSTim J. Robbins struct sigacts *psp; 340ea0fabbcSTim J. Robbins struct trapframe *regs; 341ea0fabbcSTim J. Robbins struct l_sigframe *fp, frame; 342ea0fabbcSTim J. Robbins l_sigset_t lmask; 3434ab7403bSDmitry Chagin int oonstack; 3449104847fSDavid Xu int sig, code; 345ea0fabbcSTim J. Robbins 346eca368ecSDmitry Chagin sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno); 3479104847fSDavid Xu code = ksi->ksi_code; 348ea0fabbcSTim J. Robbins PROC_LOCK_ASSERT(p, MA_OWNED); 349ea0fabbcSTim J. Robbins psp = p->p_sigacts; 350ea0fabbcSTim J. Robbins mtx_assert(&psp->ps_mtx, MA_OWNED); 351ea0fabbcSTim J. Robbins if (SIGISMEMBER(psp->ps_siginfo, sig)) { 352ea0fabbcSTim J. Robbins /* Signal handler installed with SA_SIGINFO. */ 3539104847fSDavid Xu linux_rt_sendsig(catcher, ksi, mask); 354ea0fabbcSTim J. Robbins return; 355ea0fabbcSTim J. Robbins } 356ea0fabbcSTim J. Robbins 357ea0fabbcSTim J. Robbins regs = td->td_frame; 358ea0fabbcSTim J. Robbins oonstack = sigonstack(regs->tf_rsp); 359ea0fabbcSTim J. Robbins 3604ba25759SEd Maste /* Allocate space for the signal handler context. */ 361ea0fabbcSTim J. Robbins if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 362ea0fabbcSTim J. Robbins SIGISMEMBER(psp->ps_sigonstack, sig)) { 363aa949be5SJohn Baldwin fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 364ea0fabbcSTim J. Robbins td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 365ea0fabbcSTim J. Robbins } else 366ea0fabbcSTim J. Robbins fp = (struct l_sigframe *)regs->tf_rsp - 1; 367ea0fabbcSTim J. Robbins mtx_unlock(&psp->ps_mtx); 368ea0fabbcSTim J. Robbins PROC_UNLOCK(p); 369ea0fabbcSTim J. Robbins 3704ba25759SEd Maste /* Build the argument list for the signal handler. */ 3714ab7403bSDmitry Chagin sig = bsd_to_linux_signal(sig); 372ea0fabbcSTim J. Robbins 373ea0fabbcSTim J. Robbins bzero(&frame, sizeof(frame)); 374ea0fabbcSTim J. Robbins 375ea0fabbcSTim J. Robbins frame.sf_sig = sig; 3764a6c2d07SDmitry Chagin frame.sf_sigmask = *mask; 377ea0fabbcSTim J. Robbins bsd_to_linux_sigset(mask, &lmask); 378ea0fabbcSTim J. Robbins 3794ba25759SEd Maste /* Build the signal context to be used by sigreturn. */ 3804ab7403bSDmitry Chagin frame.sf_sc.sc_mask = lmask.__mask; 3812c66cccaSKonstantin Belousov frame.sf_sc.sc_gs = regs->tf_gs; 3822c66cccaSKonstantin Belousov frame.sf_sc.sc_fs = regs->tf_fs; 3832c66cccaSKonstantin Belousov frame.sf_sc.sc_es = regs->tf_es; 3842c66cccaSKonstantin Belousov frame.sf_sc.sc_ds = regs->tf_ds; 385ea0fabbcSTim J. Robbins frame.sf_sc.sc_edi = regs->tf_rdi; 386ea0fabbcSTim J. Robbins frame.sf_sc.sc_esi = regs->tf_rsi; 387ea0fabbcSTim J. Robbins frame.sf_sc.sc_ebp = regs->tf_rbp; 388ea0fabbcSTim J. Robbins frame.sf_sc.sc_ebx = regs->tf_rbx; 389bdc37934SDmitry Chagin frame.sf_sc.sc_esp = regs->tf_rsp; 390ea0fabbcSTim J. Robbins frame.sf_sc.sc_edx = regs->tf_rdx; 391ea0fabbcSTim J. Robbins frame.sf_sc.sc_ecx = regs->tf_rcx; 392ea0fabbcSTim J. Robbins frame.sf_sc.sc_eax = regs->tf_rax; 393ea0fabbcSTim J. Robbins frame.sf_sc.sc_eip = regs->tf_rip; 394ea0fabbcSTim J. Robbins frame.sf_sc.sc_cs = regs->tf_cs; 395ea0fabbcSTim J. Robbins frame.sf_sc.sc_eflags = regs->tf_rflags; 396ea0fabbcSTim J. Robbins frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 397ea0fabbcSTim J. Robbins frame.sf_sc.sc_ss = regs->tf_ss; 398ea0fabbcSTim J. Robbins frame.sf_sc.sc_err = regs->tf_err; 39996a2b635SKonstantin Belousov frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 400ea0fabbcSTim J. Robbins frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 401ea0fabbcSTim J. Robbins 402ea0fabbcSTim J. Robbins if (copyout(&frame, fp, sizeof(frame)) != 0) { 403ea0fabbcSTim J. Robbins /* 404ea0fabbcSTim J. Robbins * Process has trashed its stack; give it an illegal 405ea0fabbcSTim J. Robbins * instruction to halt it in its tracks. 406ea0fabbcSTim J. Robbins */ 407ea0fabbcSTim J. Robbins PROC_LOCK(p); 408ea0fabbcSTim J. Robbins sigexit(td, SIGILL); 409ea0fabbcSTim J. Robbins } 410ea0fabbcSTim J. Robbins 4114ba25759SEd Maste /* Build context to run handler in. */ 412ea0fabbcSTim J. Robbins regs->tf_rsp = PTROUT(fp); 4138f9635dcSDmitry Chagin regs->tf_rip = linux32_vdso_sigcode; 414ba279bcdSDmitry Chagin regs->tf_rdi = PTROUT(catcher); 41522eca0bfSKonstantin Belousov regs->tf_rflags &= ~(PSL_T | PSL_D); 416ea0fabbcSTim J. Robbins regs->tf_cs = _ucode32sel; 417ea0fabbcSTim J. Robbins regs->tf_ss = _udatasel; 4182c66cccaSKonstantin Belousov regs->tf_ds = _udatasel; 4192c66cccaSKonstantin Belousov regs->tf_es = _udatasel; 4202c66cccaSKonstantin Belousov regs->tf_fs = _ufssel; 4212c66cccaSKonstantin Belousov regs->tf_gs = _ugssel; 4222c66cccaSKonstantin Belousov regs->tf_flags = TF_HASSEGS; 423e6c006d9SJung-uk Kim set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 424ea0fabbcSTim J. Robbins PROC_LOCK(p); 425ea0fabbcSTim J. Robbins mtx_lock(&psp->ps_mtx); 426ea0fabbcSTim J. Robbins } 427ea0fabbcSTim J. Robbins 428ea0fabbcSTim J. Robbins /* 429ea0fabbcSTim J. Robbins * System call to cleanup state after a signal 430ea0fabbcSTim J. Robbins * has been taken. Reset signal mask and 431ea0fabbcSTim J. Robbins * stack state from context left by sendsig (above). 432ea0fabbcSTim J. Robbins * Return to previous pc and psl as specified by 433ea0fabbcSTim J. Robbins * context left by sendsig. Check carefully to 434ea0fabbcSTim J. Robbins * make sure that the user has not modified the 435ea0fabbcSTim J. Robbins * psl to gain improper privileges or to cause 436ea0fabbcSTim J. Robbins * a machine fault. 437ea0fabbcSTim J. Robbins */ 438ea0fabbcSTim J. Robbins int 439ea0fabbcSTim J. Robbins linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 440ea0fabbcSTim J. Robbins { 441ea0fabbcSTim J. Robbins struct l_sigframe frame; 442ea0fabbcSTim J. Robbins struct trapframe *regs; 4434ab7403bSDmitry Chagin int eflags; 4449104847fSDavid Xu ksiginfo_t ksi; 445ea0fabbcSTim J. Robbins 446ea0fabbcSTim J. Robbins regs = td->td_frame; 447ea0fabbcSTim J. Robbins 448ea0fabbcSTim J. Robbins /* 449ea0fabbcSTim J. Robbins * The trampoline code hands us the sigframe. 450ea0fabbcSTim J. Robbins * It is unsafe to keep track of it ourselves, in the event that a 451ea0fabbcSTim J. Robbins * program jumps out of a signal handler. 452ea0fabbcSTim J. Robbins */ 453ea0fabbcSTim J. Robbins if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 454ea0fabbcSTim J. Robbins return (EFAULT); 455ea0fabbcSTim J. Robbins 4564ba25759SEd Maste /* Check for security violations. */ 457ea0fabbcSTim J. Robbins eflags = frame.sf_sc.sc_eflags; 458a42d362bSKonstantin Belousov if (!EFL_SECURE(eflags, regs->tf_rflags)) 459ea0fabbcSTim J. Robbins return(EINVAL); 460ea0fabbcSTim J. Robbins 461ea0fabbcSTim J. Robbins /* 462ea0fabbcSTim J. Robbins * Don't allow users to load a valid privileged %cs. Let the 463ea0fabbcSTim J. Robbins * hardware check for invalid selectors, excess privilege in 464ea0fabbcSTim J. Robbins * other selectors, invalid %eip's and invalid %esp's. 465ea0fabbcSTim J. Robbins */ 466ea0fabbcSTim J. Robbins if (!CS_SECURE(frame.sf_sc.sc_cs)) { 4679104847fSDavid Xu ksiginfo_init_trap(&ksi); 4689104847fSDavid Xu ksi.ksi_signo = SIGBUS; 4699104847fSDavid Xu ksi.ksi_code = BUS_OBJERR; 4709104847fSDavid Xu ksi.ksi_trapno = T_PROTFLT; 4719104847fSDavid Xu ksi.ksi_addr = (void *)regs->tf_rip; 4729104847fSDavid Xu trapsignal(td, &ksi); 473ea0fabbcSTim J. Robbins return(EINVAL); 474ea0fabbcSTim J. Robbins } 475ea0fabbcSTim J. Robbins 4764a6c2d07SDmitry Chagin kern_sigprocmask(td, SIG_SETMASK, &frame.sf_sigmask, NULL, 0); 477ea0fabbcSTim J. Robbins 4784ba25759SEd Maste /* Restore signal context. */ 479ea0fabbcSTim J. Robbins regs->tf_rdi = frame.sf_sc.sc_edi; 480ea0fabbcSTim J. Robbins regs->tf_rsi = frame.sf_sc.sc_esi; 481ea0fabbcSTim J. Robbins regs->tf_rbp = frame.sf_sc.sc_ebp; 482ea0fabbcSTim J. Robbins regs->tf_rbx = frame.sf_sc.sc_ebx; 483ea0fabbcSTim J. Robbins regs->tf_rdx = frame.sf_sc.sc_edx; 484ea0fabbcSTim J. Robbins regs->tf_rcx = frame.sf_sc.sc_ecx; 485ea0fabbcSTim J. Robbins regs->tf_rax = frame.sf_sc.sc_eax; 486ea0fabbcSTim J. Robbins regs->tf_rip = frame.sf_sc.sc_eip; 487ea0fabbcSTim J. Robbins regs->tf_cs = frame.sf_sc.sc_cs; 4882c66cccaSKonstantin Belousov regs->tf_ds = frame.sf_sc.sc_ds; 4892c66cccaSKonstantin Belousov regs->tf_es = frame.sf_sc.sc_es; 4902c66cccaSKonstantin Belousov regs->tf_fs = frame.sf_sc.sc_fs; 4912c66cccaSKonstantin Belousov regs->tf_gs = frame.sf_sc.sc_gs; 492ea0fabbcSTim J. Robbins regs->tf_rflags = eflags; 493ea0fabbcSTim J. Robbins regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 494ea0fabbcSTim J. Robbins regs->tf_ss = frame.sf_sc.sc_ss; 495e6c006d9SJung-uk Kim set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 496ea0fabbcSTim J. Robbins 497ea0fabbcSTim J. Robbins return (EJUSTRETURN); 498ea0fabbcSTim J. Robbins } 499ea0fabbcSTim J. Robbins 500ea0fabbcSTim J. Robbins /* 501ea0fabbcSTim J. Robbins * System call to cleanup state after a signal 502ea0fabbcSTim J. Robbins * has been taken. Reset signal mask and 503ea0fabbcSTim J. Robbins * stack state from context left by rt_sendsig (above). 504ea0fabbcSTim J. Robbins * Return to previous pc and psl as specified by 505ea0fabbcSTim J. Robbins * context left by sendsig. Check carefully to 506ea0fabbcSTim J. Robbins * make sure that the user has not modified the 507ea0fabbcSTim J. Robbins * psl to gain improper privileges or to cause 508ea0fabbcSTim J. Robbins * a machine fault. 509ea0fabbcSTim J. Robbins */ 510ea0fabbcSTim J. Robbins int 511ea0fabbcSTim J. Robbins linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 512ea0fabbcSTim J. Robbins { 513ea0fabbcSTim J. Robbins struct l_ucontext uc; 514ea0fabbcSTim J. Robbins struct l_sigcontext *context; 515d6e029adSKonstantin Belousov sigset_t bmask; 516ea0fabbcSTim J. Robbins l_stack_t *lss; 517ea0fabbcSTim J. Robbins stack_t ss; 518ea0fabbcSTim J. Robbins struct trapframe *regs; 519ea0fabbcSTim J. Robbins int eflags; 5209104847fSDavid Xu ksiginfo_t ksi; 521ea0fabbcSTim J. Robbins 522ea0fabbcSTim J. Robbins regs = td->td_frame; 523ea0fabbcSTim J. Robbins 524ea0fabbcSTim J. Robbins /* 525ea0fabbcSTim J. Robbins * The trampoline code hands us the ucontext. 526ea0fabbcSTim J. Robbins * It is unsafe to keep track of it ourselves, in the event that a 527ea0fabbcSTim J. Robbins * program jumps out of a signal handler. 528ea0fabbcSTim J. Robbins */ 529ea0fabbcSTim J. Robbins if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 530ea0fabbcSTim J. Robbins return (EFAULT); 531ea0fabbcSTim J. Robbins 532ea0fabbcSTim J. Robbins context = &uc.uc_mcontext; 533ea0fabbcSTim J. Robbins 5344ba25759SEd Maste /* Check for security violations. */ 535ea0fabbcSTim J. Robbins eflags = context->sc_eflags; 536a42d362bSKonstantin Belousov if (!EFL_SECURE(eflags, regs->tf_rflags)) 537ea0fabbcSTim J. Robbins return(EINVAL); 538ea0fabbcSTim J. Robbins 539ea0fabbcSTim J. Robbins /* 540ea0fabbcSTim J. Robbins * Don't allow users to load a valid privileged %cs. Let the 541ea0fabbcSTim J. Robbins * hardware check for invalid selectors, excess privilege in 542ea0fabbcSTim J. Robbins * other selectors, invalid %eip's and invalid %esp's. 543ea0fabbcSTim J. Robbins */ 544ea0fabbcSTim J. Robbins if (!CS_SECURE(context->sc_cs)) { 5459104847fSDavid Xu ksiginfo_init_trap(&ksi); 5469104847fSDavid Xu ksi.ksi_signo = SIGBUS; 5479104847fSDavid Xu ksi.ksi_code = BUS_OBJERR; 5489104847fSDavid Xu ksi.ksi_trapno = T_PROTFLT; 5499104847fSDavid Xu ksi.ksi_addr = (void *)regs->tf_rip; 5509104847fSDavid Xu trapsignal(td, &ksi); 551ea0fabbcSTim J. Robbins return(EINVAL); 552ea0fabbcSTim J. Robbins } 553ea0fabbcSTim J. Robbins 554d6e029adSKonstantin Belousov linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 555d6e029adSKonstantin Belousov kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 556ea0fabbcSTim J. Robbins 557ea0fabbcSTim J. Robbins /* 558ea0fabbcSTim J. Robbins * Restore signal context 559ea0fabbcSTim J. Robbins */ 5602c66cccaSKonstantin Belousov regs->tf_gs = context->sc_gs; 5612c66cccaSKonstantin Belousov regs->tf_fs = context->sc_fs; 5622c66cccaSKonstantin Belousov regs->tf_es = context->sc_es; 5632c66cccaSKonstantin Belousov regs->tf_ds = context->sc_ds; 564ea0fabbcSTim J. Robbins regs->tf_rdi = context->sc_edi; 565ea0fabbcSTim J. Robbins regs->tf_rsi = context->sc_esi; 566ea0fabbcSTim J. Robbins regs->tf_rbp = context->sc_ebp; 567ea0fabbcSTim J. Robbins regs->tf_rbx = context->sc_ebx; 568ea0fabbcSTim J. Robbins regs->tf_rdx = context->sc_edx; 569ea0fabbcSTim J. Robbins regs->tf_rcx = context->sc_ecx; 570ea0fabbcSTim J. Robbins regs->tf_rax = context->sc_eax; 571ea0fabbcSTim J. Robbins regs->tf_rip = context->sc_eip; 572ea0fabbcSTim J. Robbins regs->tf_cs = context->sc_cs; 573ea0fabbcSTim J. Robbins regs->tf_rflags = eflags; 574ea0fabbcSTim J. Robbins regs->tf_rsp = context->sc_esp_at_signal; 575ea0fabbcSTim J. Robbins regs->tf_ss = context->sc_ss; 576e6c006d9SJung-uk Kim set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 577ea0fabbcSTim J. Robbins 578ea0fabbcSTim J. Robbins /* 579ea0fabbcSTim J. Robbins * call sigaltstack & ignore results.. 580ea0fabbcSTim J. Robbins */ 581ea0fabbcSTim J. Robbins lss = &uc.uc_stack; 582ea0fabbcSTim J. Robbins ss.ss_sp = PTRIN(lss->ss_sp); 583ea0fabbcSTim J. Robbins ss.ss_size = lss->ss_size; 584ea0fabbcSTim J. Robbins ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 585ea0fabbcSTim J. Robbins 586ea0fabbcSTim J. Robbins (void)kern_sigaltstack(td, &ss, NULL); 587ea0fabbcSTim J. Robbins 588ea0fabbcSTim J. Robbins return (EJUSTRETURN); 589ea0fabbcSTim J. Robbins } 590ea0fabbcSTim J. Robbins 591afe1a688SKonstantin Belousov static int 5922d88da2fSKonstantin Belousov linux32_fetch_syscall_args(struct thread *td) 593ea0fabbcSTim J. Robbins { 594afe1a688SKonstantin Belousov struct proc *p; 595afe1a688SKonstantin Belousov struct trapframe *frame; 5962d88da2fSKonstantin Belousov struct syscall_args *sa; 597afe1a688SKonstantin Belousov 598afe1a688SKonstantin Belousov p = td->td_proc; 599afe1a688SKonstantin Belousov frame = td->td_frame; 6002d88da2fSKonstantin Belousov sa = &td->td_sa; 601afe1a688SKonstantin Belousov 602afe1a688SKonstantin Belousov sa->args[0] = frame->tf_rbx; 603afe1a688SKonstantin Belousov sa->args[1] = frame->tf_rcx; 604afe1a688SKonstantin Belousov sa->args[2] = frame->tf_rdx; 605afe1a688SKonstantin Belousov sa->args[3] = frame->tf_rsi; 606afe1a688SKonstantin Belousov sa->args[4] = frame->tf_rdi; 607afe1a688SKonstantin Belousov sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 608afe1a688SKonstantin Belousov sa->code = frame->tf_rax; 609cf98bc28SDavid Chisnall sa->original_code = sa->code; 610afe1a688SKonstantin Belousov 611afe1a688SKonstantin Belousov if (sa->code >= p->p_sysent->sv_size) 612fcdffc03SDmitry Chagin /* nosys */ 6135047105bSJohn Baldwin sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 614afe1a688SKonstantin Belousov else 615afe1a688SKonstantin Belousov sa->callp = &p->p_sysent->sv_table[sa->code]; 616afe1a688SKonstantin Belousov 617afe1a688SKonstantin Belousov td->td_retval[0] = 0; 618afe1a688SKonstantin Belousov td->td_retval[1] = frame->tf_rdx; 619afe1a688SKonstantin Belousov 620afe1a688SKonstantin Belousov return (0); 621ea0fabbcSTim J. Robbins } 622ea0fabbcSTim J. Robbins 623c26391f4SEdward Tomasz Napierala static void 624c26391f4SEdward Tomasz Napierala linux32_set_syscall_retval(struct thread *td, int error) 625c26391f4SEdward Tomasz Napierala { 626c26391f4SEdward Tomasz Napierala struct trapframe *frame = td->td_frame; 627c26391f4SEdward Tomasz Napierala 628c26391f4SEdward Tomasz Napierala cpu_set_syscall_retval(td, error); 629c26391f4SEdward Tomasz Napierala 630c26391f4SEdward Tomasz Napierala if (__predict_false(error != 0)) { 631c26391f4SEdward Tomasz Napierala if (error != ERESTART && error != EJUSTRETURN) 632866b1f51SEdward Tomasz Napierala frame->tf_rax = bsd_to_linux_errno(error); 633c26391f4SEdward Tomasz Napierala } 634c26391f4SEdward Tomasz Napierala } 635c26391f4SEdward Tomasz Napierala 636de8374dfSDmitry Chagin static void 637de8374dfSDmitry Chagin linux32_set_fork_retval(struct thread *td) 638de8374dfSDmitry Chagin { 639de8374dfSDmitry Chagin struct trapframe *frame = td->td_frame; 640de8374dfSDmitry Chagin 641de8374dfSDmitry Chagin frame->tf_rax = 0; 642de8374dfSDmitry Chagin } 643de8374dfSDmitry Chagin 644ea0fabbcSTim J. Robbins /* 645ea0fabbcSTim J. Robbins * Clear registers on exec 646ea0fabbcSTim J. Robbins * XXX copied from ia32_signal.c. 647ea0fabbcSTim J. Robbins */ 648ea0fabbcSTim J. Robbins static void 64931174518SJohn Baldwin linux_exec_setregs(struct thread *td, struct image_params *imgp, 65031174518SJohn Baldwin uintptr_t stack) 651ea0fabbcSTim J. Robbins { 652ea0fabbcSTim J. Robbins struct trapframe *regs = td->td_frame; 653ea0fabbcSTim J. Robbins struct pcb *pcb = td->td_pcb; 6547c5d1690SKonstantin Belousov register_t saved_rflags; 6557c5d1690SKonstantin Belousov 6567c5d1690SKonstantin Belousov regs = td->td_frame; 6577c5d1690SKonstantin Belousov pcb = td->td_pcb; 658ea0fabbcSTim J. Robbins 6592c66cccaSKonstantin Belousov if (td->td_proc->p_md.md_ldt != NULL) 6602c66cccaSKonstantin Belousov user_ldt_free(td); 6612c66cccaSKonstantin Belousov 6629c5b213eSJung-uk Kim critical_enter(); 663ea0fabbcSTim J. Robbins wrmsr(MSR_FSBASE, 0); 664ea0fabbcSTim J. Robbins wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 665ea0fabbcSTim J. Robbins pcb->pcb_fsbase = 0; 666ea0fabbcSTim J. Robbins pcb->pcb_gsbase = 0; 6679c5b213eSJung-uk Kim critical_exit(); 6682ee8325fSJohn Baldwin pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 669ea0fabbcSTim J. Robbins 6707c5d1690SKonstantin Belousov saved_rflags = regs->tf_rflags & PSL_T; 671ea0fabbcSTim J. Robbins bzero((char *)regs, sizeof(struct trapframe)); 672a107d8aaSNathan Whitehorn regs->tf_rip = imgp->entry_addr; 673ea0fabbcSTim J. Robbins regs->tf_rsp = stack; 6747c5d1690SKonstantin Belousov regs->tf_rflags = PSL_USER | saved_rflags; 6752c66cccaSKonstantin Belousov regs->tf_gs = _ugssel; 6762c66cccaSKonstantin Belousov regs->tf_fs = _ufssel; 6772c66cccaSKonstantin Belousov regs->tf_es = _udatasel; 6782c66cccaSKonstantin Belousov regs->tf_ds = _udatasel; 679ea0fabbcSTim J. Robbins regs->tf_ss = _udatasel; 6802c66cccaSKonstantin Belousov regs->tf_flags = TF_HASSEGS; 681ea0fabbcSTim J. Robbins regs->tf_cs = _ucode32sel; 682397df744SBrooks Davis regs->tf_rbx = (register_t)imgp->ps_strings; 683bdbf2db5SJung-uk Kim 68494172affSKonstantin Belousov x86_clear_dbregs(pcb); 68594172affSKonstantin Belousov 6862a988f7cSStephan Uphoff fpstate_drop(td); 687ea0fabbcSTim J. Robbins 6881b3c3256SKonstantin Belousov /* Do full restore on return so that we can change to a different %cs */ 689e6c006d9SJung-uk Kim set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 690ea0fabbcSTim J. Robbins } 691ea0fabbcSTim J. Robbins 692ea0fabbcSTim J. Robbins /* 693ea0fabbcSTim J. Robbins * XXX copied from ia32_sysvec.c. 694ea0fabbcSTim J. Robbins */ 69503b0d68cSJohn Baldwin static int 69631174518SJohn Baldwin linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) 697ea0fabbcSTim J. Robbins { 69803b0d68cSJohn Baldwin int argc, envc, error; 699ea0fabbcSTim J. Robbins u_int32_t *vectp; 70031174518SJohn Baldwin char *stringp; 70131174518SJohn Baldwin uintptr_t destp, ustringp; 702ea0fabbcSTim J. Robbins struct linux32_ps_strings *arginfo; 7034048f59cSDmitry Chagin char canary[LINUX_AT_RANDOM_LEN]; 7044048f59cSDmitry Chagin size_t execpath_len; 705ea0fabbcSTim J. Robbins 7066bea696aSJohn Baldwin arginfo = (struct linux32_ps_strings *)PROC_PS_STRINGS(imgp->proc); 70731174518SJohn Baldwin destp = (uintptr_t)arginfo; 708ea0fabbcSTim J. Robbins 709f04a0960SMark Johnston if (imgp->execpath != NULL && imgp->auxargs != NULL) { 710f04a0960SMark Johnston execpath_len = strlen(imgp->execpath) + 1; 71131174518SJohn Baldwin destp -= execpath_len; 71223a5b4edSJohn Baldwin destp = rounddown2(destp, sizeof(uint32_t)); 713b24e6ac8SBrooks Davis imgp->execpathp = (void *)destp; 714b24e6ac8SBrooks Davis error = copyout(imgp->execpath, imgp->execpathp, execpath_len); 71503b0d68cSJohn Baldwin if (error != 0) 71603b0d68cSJohn Baldwin return (error); 7174048f59cSDmitry Chagin } 7184048f59cSDmitry Chagin 7194ba25759SEd Maste /* Prepare the canary for SSP. */ 7204048f59cSDmitry Chagin arc4rand(canary, sizeof(canary), 0); 72123a5b4edSJohn Baldwin destp -= roundup(sizeof(canary), sizeof(uint32_t)); 722b24e6ac8SBrooks Davis imgp->canary = (void *)destp; 723b24e6ac8SBrooks Davis error = copyout(canary, imgp->canary, sizeof(canary)); 72403b0d68cSJohn Baldwin if (error != 0) 72503b0d68cSJohn Baldwin return (error); 7264048f59cSDmitry Chagin 72731174518SJohn Baldwin /* Allocate room for the argument and environment strings. */ 72831174518SJohn Baldwin destp -= ARG_MAX - imgp->args->stringspace; 72923a5b4edSJohn Baldwin destp = rounddown2(destp, sizeof(uint32_t)); 73031174518SJohn Baldwin ustringp = destp; 73131174518SJohn Baldwin 73203b0d68cSJohn Baldwin if (imgp->auxargs) { 733d8010b11SJohn Baldwin /* 734d8010b11SJohn Baldwin * Allocate room on the stack for the ELF auxargs 735d8010b11SJohn Baldwin * array. It has LINUX_AT_COUNT entries. 736d8010b11SJohn Baldwin */ 737d8010b11SJohn Baldwin destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo); 73823a5b4edSJohn Baldwin destp = rounddown2(destp, sizeof(uint32_t)); 73903b0d68cSJohn Baldwin } 740ea0fabbcSTim J. Robbins 74131174518SJohn Baldwin vectp = (uint32_t *)destp; 74231174518SJohn Baldwin 74373c8686eSJohn Baldwin /* 74473c8686eSJohn Baldwin * Allocate room for the argv[] and env vectors including the 74573c8686eSJohn Baldwin * terminating NULL pointers. 74673c8686eSJohn Baldwin */ 74773c8686eSJohn Baldwin vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 74873c8686eSJohn Baldwin 7494ba25759SEd Maste /* vectp also becomes our initial stack base. */ 75031174518SJohn Baldwin *stack_base = (uintptr_t)vectp; 751ea0fabbcSTim J. Robbins 752610ecfe0SMaxim Sobolev stringp = imgp->args->begin_argv; 753610ecfe0SMaxim Sobolev argc = imgp->args->argc; 754610ecfe0SMaxim Sobolev envc = imgp->args->envc; 75531174518SJohn Baldwin 7564ba25759SEd Maste /* Copy out strings - arguments and environment. */ 75731174518SJohn Baldwin error = copyout(stringp, (void *)ustringp, 75831174518SJohn Baldwin ARG_MAX - imgp->args->stringspace); 75903b0d68cSJohn Baldwin if (error != 0) 76003b0d68cSJohn Baldwin return (error); 761ea0fabbcSTim J. Robbins 7624ba25759SEd Maste /* Fill in "ps_strings" struct for ps, w, etc. */ 76303b0d68cSJohn Baldwin if (suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp) != 0 || 76403b0d68cSJohn Baldwin suword32(&arginfo->ps_nargvstr, argc) != 0) 76503b0d68cSJohn Baldwin return (EFAULT); 766ea0fabbcSTim J. Robbins 7674ba25759SEd Maste /* Fill in argument portion of vector table. */ 768ea0fabbcSTim J. Robbins for (; argc > 0; --argc) { 76931174518SJohn Baldwin if (suword32(vectp++, ustringp) != 0) 77003b0d68cSJohn Baldwin return (EFAULT); 771ea0fabbcSTim J. Robbins while (*stringp++ != 0) 77231174518SJohn Baldwin ustringp++; 77331174518SJohn Baldwin ustringp++; 774ea0fabbcSTim J. Robbins } 775ea0fabbcSTim J. Robbins 7764ba25759SEd Maste /* A null vector table pointer separates the argp's from the envp's. */ 77703b0d68cSJohn Baldwin if (suword32(vectp++, 0) != 0) 77803b0d68cSJohn Baldwin return (EFAULT); 779ea0fabbcSTim J. Robbins 78003b0d68cSJohn Baldwin if (suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp) != 0 || 78103b0d68cSJohn Baldwin suword32(&arginfo->ps_nenvstr, envc) != 0) 78203b0d68cSJohn Baldwin return (EFAULT); 783ea0fabbcSTim J. Robbins 7844ba25759SEd Maste /* Fill in environment portion of vector table. */ 785ea0fabbcSTim J. Robbins for (; envc > 0; --envc) { 78631174518SJohn Baldwin if (suword32(vectp++, ustringp) != 0) 78703b0d68cSJohn Baldwin return (EFAULT); 788ea0fabbcSTim J. Robbins while (*stringp++ != 0) 78931174518SJohn Baldwin ustringp++; 79031174518SJohn Baldwin ustringp++; 791ea0fabbcSTim J. Robbins } 792ea0fabbcSTim J. Robbins 7934ba25759SEd Maste /* The end of the vector table is a null pointer. */ 79403b0d68cSJohn Baldwin if (suword32(vectp, 0) != 0) 79503b0d68cSJohn Baldwin return (EFAULT); 796ea0fabbcSTim J. Robbins 797d8010b11SJohn Baldwin if (imgp->auxargs) { 798d8010b11SJohn Baldwin vectp++; 799d8010b11SJohn Baldwin error = imgp->sysent->sv_copyout_auxargs(imgp, 800d8010b11SJohn Baldwin (uintptr_t)vectp); 801d8010b11SJohn Baldwin if (error != 0) 802d8010b11SJohn Baldwin return (error); 803d8010b11SJohn Baldwin } 804d8010b11SJohn Baldwin 80503b0d68cSJohn Baldwin return (0); 806ea0fabbcSTim J. Robbins } 807ea0fabbcSTim J. Robbins 8087029da5cSPawel Biernacki static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 809ea0fabbcSTim J. Robbins "32-bit Linux emulation"); 810ea0fabbcSTim J. Robbins 811ea0fabbcSTim J. Robbins static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 812ea0fabbcSTim J. Robbins SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 813ea0fabbcSTim J. Robbins &linux32_maxdsiz, 0, ""); 814ea0fabbcSTim J. Robbins static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 815ea0fabbcSTim J. Robbins SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 816ea0fabbcSTim J. Robbins &linux32_maxssiz, 0, ""); 817ea0fabbcSTim J. Robbins static u_long linux32_maxvmem = LINUX32_MAXVMEM; 818ea0fabbcSTim J. Robbins SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 819ea0fabbcSTim J. Robbins &linux32_maxvmem, 0, ""); 820d5dc757eSDmitry Chagin bool linux32_emulate_i386 = false; 821d5dc757eSDmitry Chagin SYSCTL_BOOL(_compat_linux32, OID_AUTO, emulate_i386, CTLFLAG_RWTUN, 822d5dc757eSDmitry Chagin &linux32_emulate_i386, 0, "Emulate the real i386"); 823ea0fabbcSTim J. Robbins 824ea0fabbcSTim J. Robbins static void 82519059a13SJohn Baldwin linux32_fixlimit(struct rlimit *rl, int which) 826ea0fabbcSTim J. Robbins { 827ea0fabbcSTim J. Robbins 82819059a13SJohn Baldwin switch (which) { 82919059a13SJohn Baldwin case RLIMIT_DATA: 830ea0fabbcSTim J. Robbins if (linux32_maxdsiz != 0) { 83119059a13SJohn Baldwin if (rl->rlim_cur > linux32_maxdsiz) 83219059a13SJohn Baldwin rl->rlim_cur = linux32_maxdsiz; 83319059a13SJohn Baldwin if (rl->rlim_max > linux32_maxdsiz) 83419059a13SJohn Baldwin rl->rlim_max = linux32_maxdsiz; 835ea0fabbcSTim J. Robbins } 83619059a13SJohn Baldwin break; 83719059a13SJohn Baldwin case RLIMIT_STACK: 838ea0fabbcSTim J. Robbins if (linux32_maxssiz != 0) { 83919059a13SJohn Baldwin if (rl->rlim_cur > linux32_maxssiz) 84019059a13SJohn Baldwin rl->rlim_cur = linux32_maxssiz; 84119059a13SJohn Baldwin if (rl->rlim_max > linux32_maxssiz) 84219059a13SJohn Baldwin rl->rlim_max = linux32_maxssiz; 843ea0fabbcSTim J. Robbins } 84419059a13SJohn Baldwin break; 84519059a13SJohn Baldwin case RLIMIT_VMEM: 846ea0fabbcSTim J. Robbins if (linux32_maxvmem != 0) { 84719059a13SJohn Baldwin if (rl->rlim_cur > linux32_maxvmem) 84819059a13SJohn Baldwin rl->rlim_cur = linux32_maxvmem; 84919059a13SJohn Baldwin if (rl->rlim_max > linux32_maxvmem) 85019059a13SJohn Baldwin rl->rlim_max = linux32_maxvmem; 851ea0fabbcSTim J. Robbins } 85219059a13SJohn Baldwin break; 85319059a13SJohn Baldwin } 854ea0fabbcSTim J. Robbins } 855ea0fabbcSTim J. Robbins 856ea0fabbcSTim J. Robbins struct sysentvec elf_linux_sysvec = { 8572f99bcceSJohn Baldwin .sv_size = LINUX32_SYS_MAXSYSCALL, 8582f99bcceSJohn Baldwin .sv_table = linux32_sysent, 859dc858467SEd Maste .sv_fixup = linux_fixup_elf, 860a8d403e1SKonstantin Belousov .sv_sendsig = linux_sendsig, 8619931033bSDmitry Chagin .sv_sigcode = &_binary_linux32_vdso_so_o_start, 862a8d403e1SKonstantin Belousov .sv_szsigcode = &linux_szsigcode, 863a8d403e1SKonstantin Belousov .sv_name = "Linux ELF32", 864a8d403e1SKonstantin Belousov .sv_coredump = elf32_coredump, 865447636e4SEdward Tomasz Napierala .sv_elf_core_osabi = ELFOSABI_NONE, 866447636e4SEdward Tomasz Napierala .sv_elf_core_abi_vendor = LINUX_ABI_VENDOR, 867447636e4SEdward Tomasz Napierala .sv_elf_core_prepare_notes = linux32_prepare_notes, 868dc858467SEd Maste .sv_imgact_try = linux_exec_imgact_try, 869a8d403e1SKonstantin Belousov .sv_minsigstksz = LINUX_MINSIGSTKSZ, 870a8d403e1SKonstantin Belousov .sv_minuser = VM_MIN_ADDRESS, 8718f1e49a6SDmitry Chagin .sv_maxuser = LINUX32_MAXUSER, 872a8d403e1SKonstantin Belousov .sv_usrstack = LINUX32_USRSTACK, 873a8d403e1SKonstantin Belousov .sv_psstrings = LINUX32_PS_STRINGS, 8743fc21fddSMark Johnston .sv_psstringssz = sizeof(struct linux32_ps_strings), 875a8d403e1SKonstantin Belousov .sv_stackprot = VM_PROT_ALL, 8765caa67faSJohn Baldwin .sv_copyout_auxargs = linux_copyout_auxargs, 877a8d403e1SKonstantin Belousov .sv_copyout_strings = linux_copyout_strings, 878dc858467SEd Maste .sv_setregs = linux_exec_setregs, 879a8d403e1SKonstantin Belousov .sv_fixlimit = linux32_fixlimit, 880a8d403e1SKonstantin Belousov .sv_maxssiz = &linux32_maxssiz, 881870e197dSKonstantin Belousov .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP | 8829931033bSDmitry Chagin SV_SIG_DISCIGN | SV_SIG_WAITNDQ | SV_TIMEKEEP, 883c26391f4SEdward Tomasz Napierala .sv_set_syscall_retval = linux32_set_syscall_retval, 884afe1a688SKonstantin Belousov .sv_fetch_syscall_args = linux32_fetch_syscall_args, 885afe1a688SKonstantin Belousov .sv_syscallnames = NULL, 8868f1e49a6SDmitry Chagin .sv_shared_page_base = LINUX32_SHAREDPAGE, 8878f1e49a6SDmitry Chagin .sv_shared_page_len = PAGE_SIZE, 888e5d81ef1SDmitry Chagin .sv_schedtail = linux_schedtail, 88981338031SDmitry Chagin .sv_thread_detach = linux_thread_detach, 890038c7205SDmitry Chagin .sv_trap = NULL, 8915fd9cd53SDmitry Chagin .sv_onexec = linux_on_exec_vmspace, 8924815f175SKonstantin Belousov .sv_onexit = linux_on_exit, 8934815f175SKonstantin Belousov .sv_ontdexit = linux_thread_dtor, 894598f6fb4SKonstantin Belousov .sv_setid_allowed = &linux_setid_allowed_query, 895de8374dfSDmitry Chagin .sv_set_fork_retval = linux32_set_fork_retval, 896ea0fabbcSTim J. Robbins }; 897bdc37934SDmitry Chagin 8985fd9cd53SDmitry Chagin static int 8995fd9cd53SDmitry Chagin linux_on_exec_vmspace(struct proc *p, struct image_params *imgp) 9005fd9cd53SDmitry Chagin { 9019931033bSDmitry Chagin int error; 9025fd9cd53SDmitry Chagin 9039931033bSDmitry Chagin error = linux_map_vdso(p, linux_vdso_obj, linux_vdso_base, 9049931033bSDmitry Chagin LINUX32_VDSOPAGE_SIZE, imgp); 9059931033bSDmitry Chagin if (error == 0) 9065fd9cd53SDmitry Chagin linux_on_exec(p, imgp); 9079931033bSDmitry Chagin return (error); 9085fd9cd53SDmitry Chagin } 9095fd9cd53SDmitry Chagin 91009cffde9SDmitry Chagin /* 91109cffde9SDmitry Chagin * linux_vdso_install() and linux_exec_sysvec_init() must be called 91209cffde9SDmitry Chagin * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY). 91309cffde9SDmitry Chagin */ 914bdc37934SDmitry Chagin static void 9159931033bSDmitry Chagin linux_exec_sysvec_init(void *param) 9169931033bSDmitry Chagin { 9179931033bSDmitry Chagin l_uintptr_t *ktimekeep_base, *ktsc_selector; 9189931033bSDmitry Chagin struct sysentvec *sv; 9199931033bSDmitry Chagin ptrdiff_t tkoff; 9209931033bSDmitry Chagin 9219931033bSDmitry Chagin sv = param; 9229931033bSDmitry Chagin /* Fill timekeep_base */ 9239931033bSDmitry Chagin exec_sysvec_init(sv); 9249931033bSDmitry Chagin 9259931033bSDmitry Chagin tkoff = kern_timekeep_base - linux_vdso_base; 9269931033bSDmitry Chagin ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 927*361971fbSKornel Dulęba *ktimekeep_base = sv->sv_shared_page_base + sv->sv_timekeep_offset; 9289931033bSDmitry Chagin 9299931033bSDmitry Chagin tkoff = kern_tsc_selector - linux_vdso_base; 9309931033bSDmitry Chagin ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 9319931033bSDmitry Chagin *ktsc_selector = linux_vdso_tsc_selector_idx(); 9329931033bSDmitry Chagin if (bootverbose) 9339931033bSDmitry Chagin printf("Linux i386 vDSO tsc_selector: %u\n", *ktsc_selector); 9345a6a4fb2SDmitry Chagin 9355a6a4fb2SDmitry Chagin tkoff = kern_cpu_selector - linux_vdso_base; 9365a6a4fb2SDmitry Chagin ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 9375a6a4fb2SDmitry Chagin *ktsc_selector = linux_vdso_cpu_selector_idx(); 9385a6a4fb2SDmitry Chagin if (bootverbose) 9395a6a4fb2SDmitry Chagin printf("Linux i386 vDSO cpu_selector: %u\n", *ktsc_selector); 9409931033bSDmitry Chagin } 94109cffde9SDmitry Chagin SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY, 9429931033bSDmitry Chagin linux_exec_sysvec_init, &elf_linux_sysvec); 9439931033bSDmitry Chagin 9449931033bSDmitry Chagin static void 945a543556cSDmitry Chagin linux_vdso_install(const void *param) 946bdc37934SDmitry Chagin { 9479931033bSDmitry Chagin char *vdso_start = &_binary_linux32_vdso_so_o_start; 9489931033bSDmitry Chagin char *vdso_end = &_binary_linux32_vdso_so_o_end; 949bdc37934SDmitry Chagin 9509931033bSDmitry Chagin linux_szsigcode = vdso_end - vdso_start; 9519931033bSDmitry Chagin MPASS(linux_szsigcode <= LINUX32_VDSOPAGE_SIZE); 952bdc37934SDmitry Chagin 9539931033bSDmitry Chagin linux_vdso_base = LINUX32_VDSOPAGE; 954bdc37934SDmitry Chagin 9559931033bSDmitry Chagin __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base); 956bdc37934SDmitry Chagin 9579931033bSDmitry Chagin linux_vdso_obj = __elfN(linux_shared_page_init) 9589931033bSDmitry Chagin (&linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE); 9599931033bSDmitry Chagin bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode); 960bdc37934SDmitry Chagin 9619931033bSDmitry Chagin linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base); 962bdc37934SDmitry Chagin } 96309cffde9SDmitry Chagin SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST, 964f8268d4dSEd Maste linux_vdso_install, NULL); 965bdc37934SDmitry Chagin 966bdc37934SDmitry Chagin static void 967a543556cSDmitry Chagin linux_vdso_deinstall(const void *param) 968bdc37934SDmitry Chagin { 969bdc37934SDmitry Chagin 9709931033bSDmitry Chagin __elfN(linux_shared_page_fini)(linux_vdso_obj, 9719931033bSDmitry Chagin linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE); 9727b194b3dSEd Maste } 973bdc37934SDmitry Chagin SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 974f8268d4dSEd Maste linux_vdso_deinstall, NULL); 975ea0fabbcSTim J. Robbins 9769931033bSDmitry Chagin static void 9779931033bSDmitry Chagin linux_vdso_reloc(char *mapping, Elf_Addr offset) 9789931033bSDmitry Chagin { 9799931033bSDmitry Chagin const Elf_Shdr *shdr; 9809931033bSDmitry Chagin const Elf_Rel *rel; 9819931033bSDmitry Chagin const Elf_Ehdr *ehdr; 9829931033bSDmitry Chagin Elf32_Addr *where; 9839931033bSDmitry Chagin Elf_Size rtype, symidx; 9849931033bSDmitry Chagin Elf32_Addr addr, addend; 9859931033bSDmitry Chagin int i, relcnt; 9869931033bSDmitry Chagin 9879931033bSDmitry Chagin MPASS(offset != 0); 9889931033bSDmitry Chagin 9899931033bSDmitry Chagin relcnt = 0; 9909931033bSDmitry Chagin ehdr = (const Elf_Ehdr *)mapping; 9919931033bSDmitry Chagin shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff); 9929931033bSDmitry Chagin for (i = 0; i < ehdr->e_shnum; i++) 9939931033bSDmitry Chagin { 9949931033bSDmitry Chagin switch (shdr[i].sh_type) { 9959931033bSDmitry Chagin case SHT_REL: 9969931033bSDmitry Chagin rel = (const Elf_Rel *)(mapping + shdr[i].sh_offset); 9979931033bSDmitry Chagin relcnt = shdr[i].sh_size / sizeof(*rel); 9989931033bSDmitry Chagin break; 9999931033bSDmitry Chagin case SHT_RELA: 10009931033bSDmitry Chagin printf("Linux i386 vDSO: unexpected Rela section\n"); 10019931033bSDmitry Chagin break; 10029931033bSDmitry Chagin } 10039931033bSDmitry Chagin } 10049931033bSDmitry Chagin 10059931033bSDmitry Chagin for (i = 0; i < relcnt; i++, rel++) { 10069931033bSDmitry Chagin where = (Elf32_Addr *)(mapping + rel->r_offset); 10079931033bSDmitry Chagin addend = *where; 10089931033bSDmitry Chagin rtype = ELF_R_TYPE(rel->r_info); 10099931033bSDmitry Chagin symidx = ELF_R_SYM(rel->r_info); 10109931033bSDmitry Chagin 10119931033bSDmitry Chagin switch (rtype) { 10129931033bSDmitry Chagin case R_386_NONE: /* none */ 10139931033bSDmitry Chagin break; 10149931033bSDmitry Chagin 10159931033bSDmitry Chagin case R_386_RELATIVE: /* B + A */ 10169931033bSDmitry Chagin addr = (Elf32_Addr)PTROUT(offset + addend); 10179931033bSDmitry Chagin if (*where != addr) 10189931033bSDmitry Chagin *where = addr; 10199931033bSDmitry Chagin break; 10209931033bSDmitry Chagin 10219931033bSDmitry Chagin case R_386_IRELATIVE: 10229931033bSDmitry Chagin printf("Linux i386 vDSO: unexpected ifunc relocation, " 10239931033bSDmitry Chagin "symbol index %ld\n", (intmax_t)symidx); 10249931033bSDmitry Chagin break; 10259931033bSDmitry Chagin default: 10269931033bSDmitry Chagin printf("Linux i386 vDSO: unexpected relocation type %ld, " 10279931033bSDmitry Chagin "symbol index %ld\n", (intmax_t)rtype, (intmax_t)symidx); 10289931033bSDmitry Chagin } 10299931033bSDmitry Chagin } 10309931033bSDmitry Chagin } 10319931033bSDmitry Chagin 103289ffc202SBjoern A. Zeeb static char GNU_ABI_VENDOR[] = "GNU"; 103389ffc202SBjoern A. Zeeb static int GNULINUX_ABI_DESC = 0; 103489ffc202SBjoern A. Zeeb 1035a95659f7SEd Maste static bool 103689ffc202SBjoern A. Zeeb linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 103789ffc202SBjoern A. Zeeb { 103889ffc202SBjoern A. Zeeb const Elf32_Word *desc; 103989ffc202SBjoern A. Zeeb uintptr_t p; 104089ffc202SBjoern A. Zeeb 104189ffc202SBjoern A. Zeeb p = (uintptr_t)(note + 1); 104289ffc202SBjoern A. Zeeb p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 104389ffc202SBjoern A. Zeeb 104489ffc202SBjoern A. Zeeb desc = (const Elf32_Word *)p; 104589ffc202SBjoern A. Zeeb if (desc[0] != GNULINUX_ABI_DESC) 1046a95659f7SEd Maste return (false); 104789ffc202SBjoern A. Zeeb 104889ffc202SBjoern A. Zeeb /* 104935755049SChuck Tuffli * For Linux we encode osrel using the Linux convention of 105035755049SChuck Tuffli * (version << 16) | (major << 8) | (minor) 105135755049SChuck Tuffli * See macro in linux_mib.h 105289ffc202SBjoern A. Zeeb */ 105335755049SChuck Tuffli *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 105489ffc202SBjoern A. Zeeb 1055a95659f7SEd Maste return (true); 105689ffc202SBjoern A. Zeeb } 105732c01de2SDmitry Chagin 105832c01de2SDmitry Chagin static Elf_Brandnote linux32_brandnote = { 105989ffc202SBjoern A. Zeeb .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 106089ffc202SBjoern A. Zeeb .hdr.n_descsz = 16, /* XXX at least 16 */ 106132c01de2SDmitry Chagin .hdr.n_type = 1, 106289ffc202SBjoern A. Zeeb .vendor = GNU_ABI_VENDOR, 106389ffc202SBjoern A. Zeeb .flags = BN_TRANSLATE_OSREL, 106489ffc202SBjoern A. Zeeb .trans_osrel = linux32_trans_osrel 106532c01de2SDmitry Chagin }; 106632c01de2SDmitry Chagin 1067ea0fabbcSTim J. Robbins static Elf32_Brandinfo linux_brand = { 1068a8d403e1SKonstantin Belousov .brand = ELFOSABI_LINUX, 1069a8d403e1SKonstantin Belousov .machine = EM_386, 1070a8d403e1SKonstantin Belousov .compat_3_brand = "Linux", 1071b5f20658SEdward Tomasz Napierala .emul_path = linux_emul_path, 1072a8d403e1SKonstantin Belousov .interp_path = "/lib/ld-linux.so.1", 1073a8d403e1SKonstantin Belousov .sysvec = &elf_linux_sysvec, 1074a8d403e1SKonstantin Belousov .interp_newpath = NULL, 107532c01de2SDmitry Chagin .brand_note = &linux32_brandnote, 10762dedc128SDmitry Chagin .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1077ea0fabbcSTim J. Robbins }; 1078ea0fabbcSTim J. Robbins 1079ea0fabbcSTim J. Robbins static Elf32_Brandinfo linux_glibc2brand = { 1080a8d403e1SKonstantin Belousov .brand = ELFOSABI_LINUX, 1081a8d403e1SKonstantin Belousov .machine = EM_386, 1082a8d403e1SKonstantin Belousov .compat_3_brand = "Linux", 1083b5f20658SEdward Tomasz Napierala .emul_path = linux_emul_path, 1084a8d403e1SKonstantin Belousov .interp_path = "/lib/ld-linux.so.2", 1085a8d403e1SKonstantin Belousov .sysvec = &elf_linux_sysvec, 1086a8d403e1SKonstantin Belousov .interp_newpath = NULL, 108732c01de2SDmitry Chagin .brand_note = &linux32_brandnote, 10882dedc128SDmitry Chagin .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1089ea0fabbcSTim J. Robbins }; 1090ea0fabbcSTim J. Robbins 1091a0c59c7aSDmitry Chagin static Elf32_Brandinfo linux_muslbrand = { 1092a0c59c7aSDmitry Chagin .brand = ELFOSABI_LINUX, 1093a0c59c7aSDmitry Chagin .machine = EM_386, 1094a0c59c7aSDmitry Chagin .compat_3_brand = "Linux", 1095b5f20658SEdward Tomasz Napierala .emul_path = linux_emul_path, 1096a0c59c7aSDmitry Chagin .interp_path = "/lib/ld-musl-i386.so.1", 1097a0c59c7aSDmitry Chagin .sysvec = &elf_linux_sysvec, 1098a0c59c7aSDmitry Chagin .interp_newpath = NULL, 1099a0c59c7aSDmitry Chagin .brand_note = &linux32_brandnote, 1100cf8d74e3SDmitry Chagin .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE | 1101cf8d74e3SDmitry Chagin LINUX_BI_FUTEX_REQUEUE 1102a0c59c7aSDmitry Chagin }; 1103a0c59c7aSDmitry Chagin 1104ea0fabbcSTim J. Robbins Elf32_Brandinfo *linux_brandlist[] = { 1105ea0fabbcSTim J. Robbins &linux_brand, 1106ea0fabbcSTim J. Robbins &linux_glibc2brand, 1107a0c59c7aSDmitry Chagin &linux_muslbrand, 1108ea0fabbcSTim J. Robbins NULL 1109ea0fabbcSTim J. Robbins }; 1110ea0fabbcSTim J. Robbins 1111ea0fabbcSTim J. Robbins static int 1112ea0fabbcSTim J. Robbins linux_elf_modevent(module_t mod, int type, void *data) 1113ea0fabbcSTim J. Robbins { 1114ea0fabbcSTim J. Robbins Elf32_Brandinfo **brandinfo; 1115ea0fabbcSTim J. Robbins int error; 1116ea0fabbcSTim J. Robbins struct linux_ioctl_handler **lihp; 1117ea0fabbcSTim J. Robbins 1118ea0fabbcSTim J. Robbins error = 0; 1119ea0fabbcSTim J. Robbins 1120ea0fabbcSTim J. Robbins switch(type) { 1121ea0fabbcSTim J. Robbins case MOD_LOAD: 1122ea0fabbcSTim J. Robbins for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1123ea0fabbcSTim J. Robbins ++brandinfo) 1124ea0fabbcSTim J. Robbins if (elf32_insert_brand_entry(*brandinfo) < 0) 1125ea0fabbcSTim J. Robbins error = EINVAL; 1126ea0fabbcSTim J. Robbins if (error == 0) { 1127ea0fabbcSTim J. Robbins SET_FOREACH(lihp, linux_ioctl_handler_set) 11288fc08087STijl Coosemans linux32_ioctl_register_handler(*lihp); 11291ca16454SDmitry Chagin stclohz = (stathz ? stathz : hz); 1130ea0fabbcSTim J. Robbins if (bootverbose) 1131ae8330b4SDmitry Chagin printf("Linux i386 ELF exec handler installed\n"); 1132ea0fabbcSTim J. Robbins } else 1133ae8330b4SDmitry Chagin printf("cannot insert Linux i386 ELF brand handler\n"); 1134ea0fabbcSTim J. Robbins break; 1135ea0fabbcSTim J. Robbins case MOD_UNLOAD: 1136ea0fabbcSTim J. Robbins for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1137ea0fabbcSTim J. Robbins ++brandinfo) 1138ea0fabbcSTim J. Robbins if (elf32_brand_inuse(*brandinfo)) 1139ea0fabbcSTim J. Robbins error = EBUSY; 1140ea0fabbcSTim J. Robbins if (error == 0) { 1141ea0fabbcSTim J. Robbins for (brandinfo = &linux_brandlist[0]; 1142ea0fabbcSTim J. Robbins *brandinfo != NULL; ++brandinfo) 1143ea0fabbcSTim J. Robbins if (elf32_remove_brand_entry(*brandinfo) < 0) 1144ea0fabbcSTim J. Robbins error = EINVAL; 1145ea0fabbcSTim J. Robbins } 1146ea0fabbcSTim J. Robbins if (error == 0) { 1147ea0fabbcSTim J. Robbins SET_FOREACH(lihp, linux_ioctl_handler_set) 11488fc08087STijl Coosemans linux32_ioctl_unregister_handler(*lihp); 1149ea0fabbcSTim J. Robbins if (bootverbose) 1150ae8330b4SDmitry Chagin printf("Linux i386 ELF exec handler removed\n"); 1151ea0fabbcSTim J. Robbins } else 1152ae8330b4SDmitry Chagin printf("Could not deinstall Linux i386 ELF interpreter entry\n"); 1153ea0fabbcSTim J. Robbins break; 1154ea0fabbcSTim J. Robbins default: 1155af682d48SDmitry Chagin return (EOPNOTSUPP); 1156ea0fabbcSTim J. Robbins } 1157af682d48SDmitry Chagin return (error); 1158ea0fabbcSTim J. Robbins } 1159ea0fabbcSTim J. Robbins 1160ea0fabbcSTim J. Robbins static moduledata_t linux_elf_mod = { 1161ea0fabbcSTim J. Robbins "linuxelf", 1162ea0fabbcSTim J. Robbins linux_elf_modevent, 11639823d527SKevin Lo 0 1164ea0fabbcSTim J. Robbins }; 1165ea0fabbcSTim J. Robbins 116678ae4338SKonstantin Belousov DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 116767d39748SDmitry Chagin MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1); 1168b6348be7SBaptiste Daroussin FEATURE(linux, "Linux 32bit support"); 1169