2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2004 Tim J. Robbins
5 * Copyright (c) 2003 Peter Wemm
6 * Copyright (c) 2002 Doug Rabson
7 * Copyright (c) 1998-1999 Andrew Gallatin
8 * Copyright (c) 1994-1996 Søren Schmidt
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer
16 * in this position and unchanged.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include "opt_compat.h"
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #ifndef COMPAT_FREEBSD32
41 #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!"
44 #define __ELF_WORD_SIZE 32
46 #include <sys/param.h>
47 #include <sys/systm.h>
49 #include <sys/fcntl.h>
50 #include <sys/imgact.h>
51 #include <sys/imgact_elf.h>
52 #include <sys/kernel.h>
54 #include <sys/malloc.h>
55 #include <sys/module.h>
56 #include <sys/mutex.h>
58 #include <sys/resourcevar.h>
59 #include <sys/signalvar.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysctl.h>
62 #include <sys/sysent.h>
63 #include <sys/sysproto.h>
64 #include <sys/vnode.h>
65 #include <sys/eventhandler.h>
69 #include <vm/vm_extern.h>
70 #include <vm/vm_map.h>
71 #include <vm/vm_object.h>
72 #include <vm/vm_page.h>
73 #include <vm/vm_param.h>
75 #include <machine/cpu.h>
76 #include <machine/md_var.h>
77 #include <machine/pcb.h>
78 #include <machine/specialreg.h>
79 #include <machine/trap.h>
81 #include <amd64/linux32/linux.h>
82 #include <amd64/linux32/linux32_proto.h>
83 #include <compat/linux/linux_emul.h>
84 #include <compat/linux/linux_futex.h>
85 #include <compat/linux/linux_ioctl.h>
86 #include <compat/linux/linux_mib.h>
87 #include <compat/linux/linux_misc.h>
88 #include <compat/linux/linux_signal.h>
89 #include <compat/linux/linux_util.h>
90 #include <compat/linux/linux_vdso.h>
92 MODULE_VERSION(linux, 1);
94 const char *linux_kplatform;
95 static int linux_szsigcode;
96 static vm_object_t linux_shared_page_obj;
97 static char *linux_shared_page_mapping;
98 extern char _binary_linux32_locore_o_start;
99 extern char _binary_linux32_locore_o_end;
101 extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL];
103 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
105 static int linux_fixup_elf(register_t **stack_base,
106 struct image_params *iparams);
107 static register_t *linux_copyout_strings(struct image_params *imgp);
108 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
109 static void linux_exec_setregs(struct thread *td,
110 struct image_params *imgp, u_long stack);
111 static void linux32_fixlimit(struct rlimit *rl, int which);
112 static bool linux32_trans_osrel(const Elf_Note *note, int32_t *osrel);
113 static void linux_vdso_install(void *param);
114 static void linux_vdso_deinstall(void *param);
116 #define LINUX_T_UNKNOWN 255
117 static int _bsd_to_linux_trapcode[] = {
118 LINUX_T_UNKNOWN, /* 0 */
119 6, /* 1 T_PRIVINFLT */
120 LINUX_T_UNKNOWN, /* 2 */
122 LINUX_T_UNKNOWN, /* 4 */
123 LINUX_T_UNKNOWN, /* 5 */
124 16, /* 6 T_ARITHTRAP */
125 254, /* 7 T_ASTFLT */
126 LINUX_T_UNKNOWN, /* 8 */
127 13, /* 9 T_PROTFLT */
128 1, /* 10 T_TRCTRAP */
129 LINUX_T_UNKNOWN, /* 11 */
130 14, /* 12 T_PAGEFLT */
131 LINUX_T_UNKNOWN, /* 13 */
132 17, /* 14 T_ALIGNFLT */
133 LINUX_T_UNKNOWN, /* 15 */
134 LINUX_T_UNKNOWN, /* 16 */
135 LINUX_T_UNKNOWN, /* 17 */
141 8, /* 23 T_DOUBLEFLT */
142 9, /* 24 T_FPOPFLT */
143 10, /* 25 T_TSSFLT */
144 11, /* 26 T_SEGNPFLT */
145 12, /* 27 T_STKFLT */
147 19, /* 29 T_XMMFLT */
148 15 /* 30 T_RESERVED */
150 #define bsd_to_linux_trapcode(code) \
151 ((code)<nitems(_bsd_to_linux_trapcode)? \
152 _bsd_to_linux_trapcode[(code)]: \
155 struct linux32_ps_strings {
156 u_int32_t ps_argvstr; /* first of 0 or more argument strings */
157 u_int ps_nargvstr; /* the number of argument strings */
158 u_int32_t ps_envstr; /* first of 0 or more environment strings */
159 u_int ps_nenvstr; /* the number of environment strings */
162 LINUX_VDSO_SYM_INTPTR(linux32_sigcode);
163 LINUX_VDSO_SYM_INTPTR(linux32_rt_sigcode);
164 LINUX_VDSO_SYM_INTPTR(linux32_vsyscall);
165 LINUX_VDSO_SYM_CHAR(linux_platform);
168 * If FreeBSD & Linux have a difference of opinion about what a trap
169 * means, deal with it here.
174 linux_translate_traps(int signal, int trap_code)
176 if (signal != SIGBUS)
190 linux_fixup_elf(register_t **stack_base, struct image_params *imgp)
193 Elf32_Auxinfo *argarray, *pos;
194 Elf32_Addr *auxbase, *base;
195 struct linux32_ps_strings *arginfo;
196 int error, issetugid;
198 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS;
200 KASSERT(curthread->td_proc == imgp->proc,
201 ("unsafe linux_fixup_elf(), should be curproc"));
202 base = (Elf32_Addr *)*stack_base;
203 args = (Elf32_Auxargs *)imgp->auxargs;
204 auxbase = base + (imgp->args->argc + 1 + imgp->args->envc + 1);
205 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
208 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
209 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
210 imgp->proc->p_sysent->sv_shared_page_base);
211 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux32_vsyscall);
212 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
215 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
216 * as it has appeared in the 2.4.0-rc7 first time.
217 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
218 * glibc falls back to the hard-coded CLK_TCK value when aux entry
220 * Also see linux_times() implementation.
222 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
223 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
224 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
225 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
226 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
227 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
228 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
229 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
230 AUXARGS_ENTRY(pos, AT_BASE, args->base);
231 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
232 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
233 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
234 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
235 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
236 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
237 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary));
238 if (imgp->execpathp != 0)
239 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp));
240 if (args->execfd != -1)
241 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
242 AUXARGS_ENTRY(pos, AT_NULL, 0);
244 free(imgp->auxargs, M_TEMP);
245 imgp->auxargs = NULL;
246 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
248 error = copyout(&argarray[0], auxbase,
249 sizeof(*argarray) * LINUX_AT_COUNT);
250 free(argarray, M_TEMP);
255 if (suword32(base, (uint32_t)imgp->args->argc) == -1)
257 *stack_base = (register_t *)base;
262 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
264 struct thread *td = curthread;
265 struct proc *p = td->td_proc;
267 struct trapframe *regs;
268 struct l_rt_sigframe *fp, frame;
273 sig = ksi->ksi_signo;
274 code = ksi->ksi_code;
275 PROC_LOCK_ASSERT(p, MA_OWNED);
277 mtx_assert(&psp->ps_mtx, MA_OWNED);
279 oonstack = sigonstack(regs->tf_rsp);
281 /* Allocate space for the signal handler context. */
282 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
283 SIGISMEMBER(psp->ps_sigonstack, sig)) {
284 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
285 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
287 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1;
288 mtx_unlock(&psp->ps_mtx);
290 /* Build the argument list for the signal handler. */
291 sig = bsd_to_linux_signal(sig);
293 bzero(&frame, sizeof(frame));
295 frame.sf_handler = PTROUT(catcher);
297 frame.sf_siginfo = PTROUT(&fp->sf_si);
298 frame.sf_ucontext = PTROUT(&fp->sf_sc);
300 /* Fill in POSIX parts. */
301 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig);
304 * Build the signal context to be used by sigreturn and libgcc unwind.
306 frame.sf_sc.uc_flags = 0; /* XXX ??? */
307 frame.sf_sc.uc_link = 0; /* XXX ??? */
309 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
310 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
311 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
312 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
315 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
317 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask;
318 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi;
319 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi;
320 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp;
321 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx;
322 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_rsp;
323 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx;
324 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx;
325 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax;
326 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip;
327 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
328 frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs;
329 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs;
330 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es;
331 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds;
332 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags;
333 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp;
334 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss;
335 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err;
336 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr;
337 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
339 if (copyout(&frame, fp, sizeof(frame)) != 0) {
341 * Process has trashed its stack; give it an illegal
342 * instruction to halt it in its tracks.
348 /* Build context to run handler in. */
349 regs->tf_rsp = PTROUT(fp);
350 regs->tf_rip = linux32_rt_sigcode;
351 regs->tf_rflags &= ~(PSL_T | PSL_D);
352 regs->tf_cs = _ucode32sel;
353 regs->tf_ss = _udatasel;
354 regs->tf_ds = _udatasel;
355 regs->tf_es = _udatasel;
356 regs->tf_fs = _ufssel;
357 regs->tf_gs = _ugssel;
358 regs->tf_flags = TF_HASSEGS;
359 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
361 mtx_lock(&psp->ps_mtx);
366 * Send an interrupt to process.
368 * Stack is set up to allow sigcode stored
369 * in u. to call routine, followed by kcall
370 * to sigreturn routine below. After sigreturn
371 * resets the signal mask, the stack, and the
372 * frame pointer, it returns to the user
376 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
378 struct thread *td = curthread;
379 struct proc *p = td->td_proc;
381 struct trapframe *regs;
382 struct l_sigframe *fp, frame;
387 sig = ksi->ksi_signo;
388 code = ksi->ksi_code;
389 PROC_LOCK_ASSERT(p, MA_OWNED);
391 mtx_assert(&psp->ps_mtx, MA_OWNED);
392 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
393 /* Signal handler installed with SA_SIGINFO. */
394 linux_rt_sendsig(catcher, ksi, mask);
399 oonstack = sigonstack(regs->tf_rsp);
401 /* Allocate space for the signal handler context. */
402 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
403 SIGISMEMBER(psp->ps_sigonstack, sig)) {
404 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
405 td->td_sigstk.ss_size - sizeof(struct l_sigframe));
407 fp = (struct l_sigframe *)regs->tf_rsp - 1;
408 mtx_unlock(&psp->ps_mtx);
411 /* Build the argument list for the signal handler. */
412 sig = bsd_to_linux_signal(sig);
414 bzero(&frame, sizeof(frame));
416 frame.sf_handler = PTROUT(catcher);
419 bsd_to_linux_sigset(mask, &lmask);
421 /* Build the signal context to be used by sigreturn. */
422 frame.sf_sc.sc_mask = lmask.__mask;
423 frame.sf_sc.sc_gs = regs->tf_gs;
424 frame.sf_sc.sc_fs = regs->tf_fs;
425 frame.sf_sc.sc_es = regs->tf_es;
426 frame.sf_sc.sc_ds = regs->tf_ds;
427 frame.sf_sc.sc_edi = regs->tf_rdi;
428 frame.sf_sc.sc_esi = regs->tf_rsi;
429 frame.sf_sc.sc_ebp = regs->tf_rbp;
430 frame.sf_sc.sc_ebx = regs->tf_rbx;
431 frame.sf_sc.sc_esp = regs->tf_rsp;
432 frame.sf_sc.sc_edx = regs->tf_rdx;
433 frame.sf_sc.sc_ecx = regs->tf_rcx;
434 frame.sf_sc.sc_eax = regs->tf_rax;
435 frame.sf_sc.sc_eip = regs->tf_rip;
436 frame.sf_sc.sc_cs = regs->tf_cs;
437 frame.sf_sc.sc_eflags = regs->tf_rflags;
438 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp;
439 frame.sf_sc.sc_ss = regs->tf_ss;
440 frame.sf_sc.sc_err = regs->tf_err;
441 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr;
442 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code);
444 frame.sf_extramask[0] = lmask.__mask;
446 if (copyout(&frame, fp, sizeof(frame)) != 0) {
448 * Process has trashed its stack; give it an illegal
449 * instruction to halt it in its tracks.
455 /* Build context to run handler in. */
456 regs->tf_rsp = PTROUT(fp);
457 regs->tf_rip = linux32_sigcode;
458 regs->tf_rflags &= ~(PSL_T | PSL_D);
459 regs->tf_cs = _ucode32sel;
460 regs->tf_ss = _udatasel;
461 regs->tf_ds = _udatasel;
462 regs->tf_es = _udatasel;
463 regs->tf_fs = _ufssel;
464 regs->tf_gs = _ugssel;
465 regs->tf_flags = TF_HASSEGS;
466 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
468 mtx_lock(&psp->ps_mtx);
472 * System call to cleanup state after a signal
473 * has been taken. Reset signal mask and
474 * stack state from context left by sendsig (above).
475 * Return to previous pc and psl as specified by
476 * context left by sendsig. Check carefully to
477 * make sure that the user has not modified the
478 * psl to gain improper privileges or to cause
482 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
484 struct l_sigframe frame;
485 struct trapframe *regs;
494 * The trampoline code hands us the sigframe.
495 * It is unsafe to keep track of it ourselves, in the event that a
496 * program jumps out of a signal handler.
498 if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
501 /* Check for security violations. */
502 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
503 eflags = frame.sf_sc.sc_eflags;
504 if (!EFLAGS_SECURE(eflags, regs->tf_rflags))
508 * Don't allow users to load a valid privileged %cs. Let the
509 * hardware check for invalid selectors, excess privilege in
510 * other selectors, invalid %eip's and invalid %esp's.
512 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
513 if (!CS_SECURE(frame.sf_sc.sc_cs)) {
514 ksiginfo_init_trap(&ksi);
515 ksi.ksi_signo = SIGBUS;
516 ksi.ksi_code = BUS_OBJERR;
517 ksi.ksi_trapno = T_PROTFLT;
518 ksi.ksi_addr = (void *)regs->tf_rip;
519 trapsignal(td, &ksi);
523 lmask.__mask = frame.sf_sc.sc_mask;
524 lmask.__mask = frame.sf_extramask[0];
525 linux_to_bsd_sigset(&lmask, &bmask);
526 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
528 /* Restore signal context. */
529 regs->tf_rdi = frame.sf_sc.sc_edi;
530 regs->tf_rsi = frame.sf_sc.sc_esi;
531 regs->tf_rbp = frame.sf_sc.sc_ebp;
532 regs->tf_rbx = frame.sf_sc.sc_ebx;
533 regs->tf_rdx = frame.sf_sc.sc_edx;
534 regs->tf_rcx = frame.sf_sc.sc_ecx;
535 regs->tf_rax = frame.sf_sc.sc_eax;
536 regs->tf_rip = frame.sf_sc.sc_eip;
537 regs->tf_cs = frame.sf_sc.sc_cs;
538 regs->tf_ds = frame.sf_sc.sc_ds;
539 regs->tf_es = frame.sf_sc.sc_es;
540 regs->tf_fs = frame.sf_sc.sc_fs;
541 regs->tf_gs = frame.sf_sc.sc_gs;
542 regs->tf_rflags = eflags;
543 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal;
544 regs->tf_ss = frame.sf_sc.sc_ss;
545 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
547 return (EJUSTRETURN);
551 * System call to cleanup state after a signal
552 * has been taken. Reset signal mask and
553 * stack state from context left by rt_sendsig (above).
554 * Return to previous pc and psl as specified by
555 * context left by sendsig. Check carefully to
556 * make sure that the user has not modified the
557 * psl to gain improper privileges or to cause
561 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
563 struct l_ucontext uc;
564 struct l_sigcontext *context;
568 struct trapframe *regs;
575 * The trampoline code hands us the ucontext.
576 * It is unsafe to keep track of it ourselves, in the event that a
577 * program jumps out of a signal handler.
579 if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
582 context = &uc.uc_mcontext;
584 /* Check for security violations. */
585 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
586 eflags = context->sc_eflags;
587 if (!EFLAGS_SECURE(eflags, regs->tf_rflags))
591 * Don't allow users to load a valid privileged %cs. Let the
592 * hardware check for invalid selectors, excess privilege in
593 * other selectors, invalid %eip's and invalid %esp's.
595 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
596 if (!CS_SECURE(context->sc_cs)) {
597 ksiginfo_init_trap(&ksi);
598 ksi.ksi_signo = SIGBUS;
599 ksi.ksi_code = BUS_OBJERR;
600 ksi.ksi_trapno = T_PROTFLT;
601 ksi.ksi_addr = (void *)regs->tf_rip;
602 trapsignal(td, &ksi);
606 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
607 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
610 * Restore signal context
612 regs->tf_gs = context->sc_gs;
613 regs->tf_fs = context->sc_fs;
614 regs->tf_es = context->sc_es;
615 regs->tf_ds = context->sc_ds;
616 regs->tf_rdi = context->sc_edi;
617 regs->tf_rsi = context->sc_esi;
618 regs->tf_rbp = context->sc_ebp;
619 regs->tf_rbx = context->sc_ebx;
620 regs->tf_rdx = context->sc_edx;
621 regs->tf_rcx = context->sc_ecx;
622 regs->tf_rax = context->sc_eax;
623 regs->tf_rip = context->sc_eip;
624 regs->tf_cs = context->sc_cs;
625 regs->tf_rflags = eflags;
626 regs->tf_rsp = context->sc_esp_at_signal;
627 regs->tf_ss = context->sc_ss;
628 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
631 * call sigaltstack & ignore results..
634 ss.ss_sp = PTRIN(lss->ss_sp);
635 ss.ss_size = lss->ss_size;
636 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
638 (void)kern_sigaltstack(td, &ss, NULL);
640 return (EJUSTRETURN);
644 linux32_fetch_syscall_args(struct thread *td)
647 struct trapframe *frame;
648 struct syscall_args *sa;
651 frame = td->td_frame;
654 sa->args[0] = frame->tf_rbx;
655 sa->args[1] = frame->tf_rcx;
656 sa->args[2] = frame->tf_rdx;
657 sa->args[3] = frame->tf_rsi;
658 sa->args[4] = frame->tf_rdi;
659 sa->args[5] = frame->tf_rbp; /* Unconfirmed */
660 sa->code = frame->tf_rax;
662 if (sa->code >= p->p_sysent->sv_size)
664 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
666 sa->callp = &p->p_sysent->sv_table[sa->code];
667 sa->narg = sa->callp->sy_narg;
669 td->td_retval[0] = 0;
670 td->td_retval[1] = frame->tf_rdx;
676 * Clear registers on exec
677 * XXX copied from ia32_signal.c.
680 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
682 struct trapframe *regs = td->td_frame;
683 struct pcb *pcb = td->td_pcb;
684 register_t saved_rflags;
689 if (td->td_proc->p_md.md_ldt != NULL)
693 wrmsr(MSR_FSBASE, 0);
694 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */
698 pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
700 saved_rflags = regs->tf_rflags & PSL_T;
701 bzero((char *)regs, sizeof(struct trapframe));
702 regs->tf_rip = imgp->entry_addr;
703 regs->tf_rsp = stack;
704 regs->tf_rflags = PSL_USER | saved_rflags;
705 regs->tf_gs = _ugssel;
706 regs->tf_fs = _ufssel;
707 regs->tf_es = _udatasel;
708 regs->tf_ds = _udatasel;
709 regs->tf_ss = _udatasel;
710 regs->tf_flags = TF_HASSEGS;
711 regs->tf_cs = _ucode32sel;
712 regs->tf_rbx = imgp->ps_strings;
716 /* Do full restore on return so that we can change to a different %cs */
717 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);
721 * XXX copied from ia32_sysvec.c.
724 linux_copyout_strings(struct image_params *imgp)
728 char *stringp, *destp;
729 u_int32_t *stack_base;
730 struct linux32_ps_strings *arginfo;
731 char canary[LINUX_AT_RANDOM_LEN];
734 /* Calculate string base and vector table pointers. */
735 if (imgp->execpath != NULL && imgp->auxargs != NULL)
736 execpath_len = strlen(imgp->execpath) + 1;
740 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS;
741 destp = (caddr_t)arginfo - SPARE_USRSPACE -
742 roundup(sizeof(canary), sizeof(char *)) -
743 roundup(execpath_len, sizeof(char *)) -
744 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));
746 if (execpath_len != 0) {
747 imgp->execpathp = (uintptr_t)arginfo - execpath_len;
748 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len);
751 /* Prepare the canary for SSP. */
752 arc4rand(canary, sizeof(canary), 0);
753 imgp->canary = (uintptr_t)arginfo -
754 roundup(execpath_len, sizeof(char *)) -
755 roundup(sizeof(canary), sizeof(char *));
756 copyout(canary, (void *)imgp->canary, sizeof(canary));
758 vectp = (uint32_t *)destp;
761 * Allocate room on the stack for the ELF auxargs
762 * array. It has LINUX_AT_COUNT entries.
764 vectp -= howmany(LINUX_AT_COUNT * sizeof(Elf32_Auxinfo),
769 * Allocate room for the argv[] and env vectors including the
770 * terminating NULL pointers.
772 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
774 /* vectp also becomes our initial stack base. */
777 stringp = imgp->args->begin_argv;
778 argc = imgp->args->argc;
779 envc = imgp->args->envc;
780 /* Copy out strings - arguments and environment. */
781 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
783 /* Fill in "ps_strings" struct for ps, w, etc. */
784 suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp);
785 suword32(&arginfo->ps_nargvstr, argc);
787 /* Fill in argument portion of vector table. */
788 for (; argc > 0; --argc) {
789 suword32(vectp++, (uint32_t)(intptr_t)destp);
790 while (*stringp++ != 0)
795 /* A null vector table pointer separates the argp's from the envp's. */
796 suword32(vectp++, 0);
798 suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp);
799 suword32(&arginfo->ps_nenvstr, envc);
801 /* Fill in environment portion of vector table. */
802 for (; envc > 0; --envc) {
803 suword32(vectp++, (uint32_t)(intptr_t)destp);
804 while (*stringp++ != 0)
809 /* The end of the vector table is a null pointer. */
812 return ((register_t *)stack_base);
815 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0,
816 "32-bit Linux emulation");
818 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ;
819 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW,
820 &linux32_maxdsiz, 0, "");
821 static u_long linux32_maxssiz = LINUX32_MAXSSIZ;
822 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW,
823 &linux32_maxssiz, 0, "");
824 static u_long linux32_maxvmem = LINUX32_MAXVMEM;
825 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW,
826 &linux32_maxvmem, 0, "");
829 linux32_fixlimit(struct rlimit *rl, int which)
834 if (linux32_maxdsiz != 0) {
835 if (rl->rlim_cur > linux32_maxdsiz)
836 rl->rlim_cur = linux32_maxdsiz;
837 if (rl->rlim_max > linux32_maxdsiz)
838 rl->rlim_max = linux32_maxdsiz;
842 if (linux32_maxssiz != 0) {
843 if (rl->rlim_cur > linux32_maxssiz)
844 rl->rlim_cur = linux32_maxssiz;
845 if (rl->rlim_max > linux32_maxssiz)
846 rl->rlim_max = linux32_maxssiz;
850 if (linux32_maxvmem != 0) {
851 if (rl->rlim_cur > linux32_maxvmem)
852 rl->rlim_cur = linux32_maxvmem;
853 if (rl->rlim_max > linux32_maxvmem)
854 rl->rlim_max = linux32_maxvmem;
860 struct sysentvec elf_linux_sysvec = {
861 .sv_size = LINUX32_SYS_MAXSYSCALL,
862 .sv_table = linux32_sysent,
863 .sv_errsize = ELAST + 1,
864 .sv_errtbl = linux_errtbl,
865 .sv_transtrap = linux_translate_traps,
866 .sv_fixup = linux_fixup_elf,
867 .sv_sendsig = linux_sendsig,
868 .sv_sigcode = &_binary_linux32_locore_o_start,
869 .sv_szsigcode = &linux_szsigcode,
870 .sv_name = "Linux ELF32",
871 .sv_coredump = elf32_coredump,
872 .sv_imgact_try = linux_exec_imgact_try,
873 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
874 .sv_minuser = VM_MIN_ADDRESS,
875 .sv_maxuser = LINUX32_MAXUSER,
876 .sv_usrstack = LINUX32_USRSTACK,
877 .sv_psstrings = LINUX32_PS_STRINGS,
878 .sv_stackprot = VM_PROT_ALL,
879 .sv_copyout_strings = linux_copyout_strings,
880 .sv_setregs = linux_exec_setregs,
881 .sv_fixlimit = linux32_fixlimit,
882 .sv_maxssiz = &linux32_maxssiz,
883 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP,
884 .sv_set_syscall_retval = cpu_set_syscall_retval,
885 .sv_fetch_syscall_args = linux32_fetch_syscall_args,
886 .sv_syscallnames = NULL,
887 .sv_shared_page_base = LINUX32_SHAREDPAGE,
888 .sv_shared_page_len = PAGE_SIZE,
889 .sv_schedtail = linux_schedtail,
890 .sv_thread_detach = linux_thread_detach,
895 linux_vdso_install(void *param)
898 linux_szsigcode = (&_binary_linux32_locore_o_end -
899 &_binary_linux32_locore_o_start);
901 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
902 panic("Linux invalid vdso size\n");
904 __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
906 linux_shared_page_obj = __elfN(linux_shared_page_init)
907 (&linux_shared_page_mapping);
909 __elfN(linux_vdso_reloc)(&elf_linux_sysvec);
911 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
913 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
915 linux_kplatform = linux_shared_page_mapping +
916 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base);
918 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
919 linux_vdso_install, NULL);
922 linux_vdso_deinstall(void *param)
925 __elfN(linux_shared_page_fini)(linux_shared_page_obj);
927 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
928 linux_vdso_deinstall, NULL);
930 static char GNU_ABI_VENDOR[] = "GNU";
931 static int GNULINUX_ABI_DESC = 0;
934 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel)
936 const Elf32_Word *desc;
939 p = (uintptr_t)(note + 1);
940 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
942 desc = (const Elf32_Word *)p;
943 if (desc[0] != GNULINUX_ABI_DESC)
947 * For Linux we encode osrel using the Linux convention of
948 * (version << 16) | (major << 8) | (minor)
949 * See macro in linux_mib.h
951 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
956 static Elf_Brandnote linux32_brandnote = {
957 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
958 .hdr.n_descsz = 16, /* XXX at least 16 */
960 .vendor = GNU_ABI_VENDOR,
961 .flags = BN_TRANSLATE_OSREL,
962 .trans_osrel = linux32_trans_osrel
965 static Elf32_Brandinfo linux_brand = {
966 .brand = ELFOSABI_LINUX,
968 .compat_3_brand = "Linux",
969 .emul_path = "/compat/linux",
970 .interp_path = "/lib/ld-linux.so.1",
971 .sysvec = &elf_linux_sysvec,
972 .interp_newpath = NULL,
973 .brand_note = &linux32_brandnote,
974 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
977 static Elf32_Brandinfo linux_glibc2brand = {
978 .brand = ELFOSABI_LINUX,
980 .compat_3_brand = "Linux",
981 .emul_path = "/compat/linux",
982 .interp_path = "/lib/ld-linux.so.2",
983 .sysvec = &elf_linux_sysvec,
984 .interp_newpath = NULL,
985 .brand_note = &linux32_brandnote,
986 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
989 static Elf32_Brandinfo linux_muslbrand = {
990 .brand = ELFOSABI_LINUX,
992 .compat_3_brand = "Linux",
993 .emul_path = "/compat/linux",
994 .interp_path = "/lib/ld-musl-i386.so.1",
995 .sysvec = &elf_linux_sysvec,
996 .interp_newpath = NULL,
997 .brand_note = &linux32_brandnote,
998 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
1001 Elf32_Brandinfo *linux_brandlist[] = {
1009 linux_elf_modevent(module_t mod, int type, void *data)
1011 Elf32_Brandinfo **brandinfo;
1013 struct linux_ioctl_handler **lihp;
1019 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
1021 if (elf32_insert_brand_entry(*brandinfo) < 0)
1024 SET_FOREACH(lihp, linux_ioctl_handler_set)
1025 linux32_ioctl_register_handler(*lihp);
1026 LIST_INIT(&futex_list);
1027 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF);
1028 stclohz = (stathz ? stathz : hz);
1030 printf("Linux ELF exec handler installed\n");
1032 printf("cannot insert Linux ELF brand handler\n");
1035 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
1037 if (elf32_brand_inuse(*brandinfo))
1040 for (brandinfo = &linux_brandlist[0];
1041 *brandinfo != NULL; ++brandinfo)
1042 if (elf32_remove_brand_entry(*brandinfo) < 0)
1046 SET_FOREACH(lihp, linux_ioctl_handler_set)
1047 linux32_ioctl_unregister_handler(*lihp);
1048 mtx_destroy(&futex_mtx);
1050 printf("Linux ELF exec handler removed\n");
1052 printf("Could not deinstall ELF interpreter entry\n");
1055 return (EOPNOTSUPP);
1060 static moduledata_t linux_elf_mod = {
1066 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
1067 MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1);
1068 FEATURE(linux, "Linux 32bit support");