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_ioctl.h>
85 #include <compat/linux/linux_mib.h>
86 #include <compat/linux/linux_misc.h>
87 #include <compat/linux/linux_signal.h>
88 #include <compat/linux/linux_util.h>
89 #include <compat/linux/linux_vdso.h>
91 MODULE_VERSION(linux, 1);
93 const char *linux_kplatform;
94 static int linux_szsigcode;
95 static vm_object_t linux_shared_page_obj;
96 static char *linux_shared_page_mapping;
97 extern char _binary_linux32_locore_o_start;
98 extern char _binary_linux32_locore_o_end;
100 extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL];
102 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
104 static int linux_fixup_elf(uintptr_t *stack_base,
105 struct image_params *iparams);
106 static int linux_copyout_strings(struct image_params *imgp,
107 uintptr_t *stack_base);
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, uintptr_t 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_copyout_auxargs(struct image_params *imgp, uintptr_t base)
193 Elf32_Auxinfo *argarray, *pos;
194 int error, issetugid;
196 args = (Elf32_Auxargs *)imgp->auxargs;
197 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
200 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
201 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
202 imgp->proc->p_sysent->sv_shared_page_base);
203 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux32_vsyscall);
204 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
207 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
208 * as it has appeared in the 2.4.0-rc7 first time.
209 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
210 * glibc falls back to the hard-coded CLK_TCK value when aux entry
212 * Also see linux_times() implementation.
214 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
215 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
216 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
217 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
218 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
219 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
220 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
221 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
222 AUXARGS_ENTRY(pos, AT_BASE, args->base);
223 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
224 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
225 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
226 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
227 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
228 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
229 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary));
230 if (imgp->execpathp != 0)
231 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp));
232 if (args->execfd != -1)
233 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
234 AUXARGS_ENTRY(pos, AT_NULL, 0);
236 free(imgp->auxargs, M_TEMP);
237 imgp->auxargs = NULL;
238 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
240 error = copyout(argarray, (void *)base,
241 sizeof(*argarray) * LINUX_AT_COUNT);
242 free(argarray, M_TEMP);
247 linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp)
251 base = (Elf32_Addr *)*stack_base;
253 if (suword32(base, (uint32_t)imgp->args->argc) == -1)
255 *stack_base = (uintptr_t)base;
260 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
262 struct thread *td = curthread;
263 struct proc *p = td->td_proc;
265 struct trapframe *regs;
266 struct l_rt_sigframe *fp, frame;
271 sig = ksi->ksi_signo;
272 code = ksi->ksi_code;
273 PROC_LOCK_ASSERT(p, MA_OWNED);
275 mtx_assert(&psp->ps_mtx, MA_OWNED);
277 oonstack = sigonstack(regs->tf_rsp);
279 /* Allocate space for the signal handler context. */
280 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
281 SIGISMEMBER(psp->ps_sigonstack, sig)) {
282 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
283 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
285 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1;
286 mtx_unlock(&psp->ps_mtx);
288 /* Build the argument list for the signal handler. */
289 sig = bsd_to_linux_signal(sig);
291 bzero(&frame, sizeof(frame));
293 frame.sf_handler = PTROUT(catcher);
295 frame.sf_siginfo = PTROUT(&fp->sf_si);
296 frame.sf_ucontext = PTROUT(&fp->sf_sc);
298 /* Fill in POSIX parts. */
299 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig);
302 * Build the signal context to be used by sigreturn and libgcc unwind.
304 frame.sf_sc.uc_flags = 0; /* XXX ??? */
305 frame.sf_sc.uc_link = 0; /* XXX ??? */
307 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
308 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
309 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
310 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
313 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
315 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask;
316 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi;
317 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi;
318 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp;
319 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx;
320 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_rsp;
321 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx;
322 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx;
323 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax;
324 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip;
325 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
326 frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs;
327 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs;
328 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es;
329 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds;
330 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags;
331 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp;
332 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss;
333 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err;
334 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr;
335 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
337 if (copyout(&frame, fp, sizeof(frame)) != 0) {
339 * Process has trashed its stack; give it an illegal
340 * instruction to halt it in its tracks.
346 /* Build context to run handler in. */
347 regs->tf_rsp = PTROUT(fp);
348 regs->tf_rip = linux32_rt_sigcode;
349 regs->tf_rflags &= ~(PSL_T | PSL_D);
350 regs->tf_cs = _ucode32sel;
351 regs->tf_ss = _udatasel;
352 regs->tf_ds = _udatasel;
353 regs->tf_es = _udatasel;
354 regs->tf_fs = _ufssel;
355 regs->tf_gs = _ugssel;
356 regs->tf_flags = TF_HASSEGS;
357 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
359 mtx_lock(&psp->ps_mtx);
364 * Send an interrupt to process.
366 * Stack is set up to allow sigcode stored
367 * in u. to call routine, followed by kcall
368 * to sigreturn routine below. After sigreturn
369 * resets the signal mask, the stack, and the
370 * frame pointer, it returns to the user
374 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
376 struct thread *td = curthread;
377 struct proc *p = td->td_proc;
379 struct trapframe *regs;
380 struct l_sigframe *fp, frame;
385 sig = ksi->ksi_signo;
386 code = ksi->ksi_code;
387 PROC_LOCK_ASSERT(p, MA_OWNED);
389 mtx_assert(&psp->ps_mtx, MA_OWNED);
390 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
391 /* Signal handler installed with SA_SIGINFO. */
392 linux_rt_sendsig(catcher, ksi, mask);
397 oonstack = sigonstack(regs->tf_rsp);
399 /* Allocate space for the signal handler context. */
400 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
401 SIGISMEMBER(psp->ps_sigonstack, sig)) {
402 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
403 td->td_sigstk.ss_size - sizeof(struct l_sigframe));
405 fp = (struct l_sigframe *)regs->tf_rsp - 1;
406 mtx_unlock(&psp->ps_mtx);
409 /* Build the argument list for the signal handler. */
410 sig = bsd_to_linux_signal(sig);
412 bzero(&frame, sizeof(frame));
414 frame.sf_handler = PTROUT(catcher);
417 bsd_to_linux_sigset(mask, &lmask);
419 /* Build the signal context to be used by sigreturn. */
420 frame.sf_sc.sc_mask = lmask.__mask;
421 frame.sf_sc.sc_gs = regs->tf_gs;
422 frame.sf_sc.sc_fs = regs->tf_fs;
423 frame.sf_sc.sc_es = regs->tf_es;
424 frame.sf_sc.sc_ds = regs->tf_ds;
425 frame.sf_sc.sc_edi = regs->tf_rdi;
426 frame.sf_sc.sc_esi = regs->tf_rsi;
427 frame.sf_sc.sc_ebp = regs->tf_rbp;
428 frame.sf_sc.sc_ebx = regs->tf_rbx;
429 frame.sf_sc.sc_esp = regs->tf_rsp;
430 frame.sf_sc.sc_edx = regs->tf_rdx;
431 frame.sf_sc.sc_ecx = regs->tf_rcx;
432 frame.sf_sc.sc_eax = regs->tf_rax;
433 frame.sf_sc.sc_eip = regs->tf_rip;
434 frame.sf_sc.sc_cs = regs->tf_cs;
435 frame.sf_sc.sc_eflags = regs->tf_rflags;
436 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp;
437 frame.sf_sc.sc_ss = regs->tf_ss;
438 frame.sf_sc.sc_err = regs->tf_err;
439 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr;
440 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code);
442 frame.sf_extramask[0] = lmask.__mask;
444 if (copyout(&frame, fp, sizeof(frame)) != 0) {
446 * Process has trashed its stack; give it an illegal
447 * instruction to halt it in its tracks.
453 /* Build context to run handler in. */
454 regs->tf_rsp = PTROUT(fp);
455 regs->tf_rip = linux32_sigcode;
456 regs->tf_rflags &= ~(PSL_T | PSL_D);
457 regs->tf_cs = _ucode32sel;
458 regs->tf_ss = _udatasel;
459 regs->tf_ds = _udatasel;
460 regs->tf_es = _udatasel;
461 regs->tf_fs = _ufssel;
462 regs->tf_gs = _ugssel;
463 regs->tf_flags = TF_HASSEGS;
464 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
466 mtx_lock(&psp->ps_mtx);
470 * System call to cleanup state after a signal
471 * has been taken. Reset signal mask and
472 * stack state from context left by sendsig (above).
473 * Return to previous pc and psl as specified by
474 * context left by sendsig. Check carefully to
475 * make sure that the user has not modified the
476 * psl to gain improper privileges or to cause
480 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
482 struct l_sigframe frame;
483 struct trapframe *regs;
492 * The trampoline code hands us the sigframe.
493 * It is unsafe to keep track of it ourselves, in the event that a
494 * program jumps out of a signal handler.
496 if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
499 /* Check for security violations. */
500 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
501 eflags = frame.sf_sc.sc_eflags;
502 if (!EFLAGS_SECURE(eflags, regs->tf_rflags))
506 * Don't allow users to load a valid privileged %cs. Let the
507 * hardware check for invalid selectors, excess privilege in
508 * other selectors, invalid %eip's and invalid %esp's.
510 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
511 if (!CS_SECURE(frame.sf_sc.sc_cs)) {
512 ksiginfo_init_trap(&ksi);
513 ksi.ksi_signo = SIGBUS;
514 ksi.ksi_code = BUS_OBJERR;
515 ksi.ksi_trapno = T_PROTFLT;
516 ksi.ksi_addr = (void *)regs->tf_rip;
517 trapsignal(td, &ksi);
521 lmask.__mask = frame.sf_sc.sc_mask;
522 lmask.__mask = frame.sf_extramask[0];
523 linux_to_bsd_sigset(&lmask, &bmask);
524 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
526 /* Restore signal context. */
527 regs->tf_rdi = frame.sf_sc.sc_edi;
528 regs->tf_rsi = frame.sf_sc.sc_esi;
529 regs->tf_rbp = frame.sf_sc.sc_ebp;
530 regs->tf_rbx = frame.sf_sc.sc_ebx;
531 regs->tf_rdx = frame.sf_sc.sc_edx;
532 regs->tf_rcx = frame.sf_sc.sc_ecx;
533 regs->tf_rax = frame.sf_sc.sc_eax;
534 regs->tf_rip = frame.sf_sc.sc_eip;
535 regs->tf_cs = frame.sf_sc.sc_cs;
536 regs->tf_ds = frame.sf_sc.sc_ds;
537 regs->tf_es = frame.sf_sc.sc_es;
538 regs->tf_fs = frame.sf_sc.sc_fs;
539 regs->tf_gs = frame.sf_sc.sc_gs;
540 regs->tf_rflags = eflags;
541 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal;
542 regs->tf_ss = frame.sf_sc.sc_ss;
543 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
545 return (EJUSTRETURN);
549 * System call to cleanup state after a signal
550 * has been taken. Reset signal mask and
551 * stack state from context left by rt_sendsig (above).
552 * Return to previous pc and psl as specified by
553 * context left by sendsig. Check carefully to
554 * make sure that the user has not modified the
555 * psl to gain improper privileges or to cause
559 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
561 struct l_ucontext uc;
562 struct l_sigcontext *context;
566 struct trapframe *regs;
573 * The trampoline code hands us the ucontext.
574 * It is unsafe to keep track of it ourselves, in the event that a
575 * program jumps out of a signal handler.
577 if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
580 context = &uc.uc_mcontext;
582 /* Check for security violations. */
583 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
584 eflags = context->sc_eflags;
585 if (!EFLAGS_SECURE(eflags, regs->tf_rflags))
589 * Don't allow users to load a valid privileged %cs. Let the
590 * hardware check for invalid selectors, excess privilege in
591 * other selectors, invalid %eip's and invalid %esp's.
593 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
594 if (!CS_SECURE(context->sc_cs)) {
595 ksiginfo_init_trap(&ksi);
596 ksi.ksi_signo = SIGBUS;
597 ksi.ksi_code = BUS_OBJERR;
598 ksi.ksi_trapno = T_PROTFLT;
599 ksi.ksi_addr = (void *)regs->tf_rip;
600 trapsignal(td, &ksi);
604 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
605 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
608 * Restore signal context
610 regs->tf_gs = context->sc_gs;
611 regs->tf_fs = context->sc_fs;
612 regs->tf_es = context->sc_es;
613 regs->tf_ds = context->sc_ds;
614 regs->tf_rdi = context->sc_edi;
615 regs->tf_rsi = context->sc_esi;
616 regs->tf_rbp = context->sc_ebp;
617 regs->tf_rbx = context->sc_ebx;
618 regs->tf_rdx = context->sc_edx;
619 regs->tf_rcx = context->sc_ecx;
620 regs->tf_rax = context->sc_eax;
621 regs->tf_rip = context->sc_eip;
622 regs->tf_cs = context->sc_cs;
623 regs->tf_rflags = eflags;
624 regs->tf_rsp = context->sc_esp_at_signal;
625 regs->tf_ss = context->sc_ss;
626 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
629 * call sigaltstack & ignore results..
632 ss.ss_sp = PTRIN(lss->ss_sp);
633 ss.ss_size = lss->ss_size;
634 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
636 (void)kern_sigaltstack(td, &ss, NULL);
638 return (EJUSTRETURN);
642 linux32_fetch_syscall_args(struct thread *td)
645 struct trapframe *frame;
646 struct syscall_args *sa;
649 frame = td->td_frame;
652 sa->args[0] = frame->tf_rbx;
653 sa->args[1] = frame->tf_rcx;
654 sa->args[2] = frame->tf_rdx;
655 sa->args[3] = frame->tf_rsi;
656 sa->args[4] = frame->tf_rdi;
657 sa->args[5] = frame->tf_rbp; /* Unconfirmed */
658 sa->code = frame->tf_rax;
660 if (sa->code >= p->p_sysent->sv_size)
662 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
664 sa->callp = &p->p_sysent->sv_table[sa->code];
665 sa->narg = sa->callp->sy_narg;
667 td->td_retval[0] = 0;
668 td->td_retval[1] = frame->tf_rdx;
674 * Clear registers on exec
675 * XXX copied from ia32_signal.c.
678 linux_exec_setregs(struct thread *td, struct image_params *imgp,
681 struct trapframe *regs = td->td_frame;
682 struct pcb *pcb = td->td_pcb;
683 register_t saved_rflags;
688 if (td->td_proc->p_md.md_ldt != NULL)
692 wrmsr(MSR_FSBASE, 0);
693 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */
697 pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
699 saved_rflags = regs->tf_rflags & PSL_T;
700 bzero((char *)regs, sizeof(struct trapframe));
701 regs->tf_rip = imgp->entry_addr;
702 regs->tf_rsp = stack;
703 regs->tf_rflags = PSL_USER | saved_rflags;
704 regs->tf_gs = _ugssel;
705 regs->tf_fs = _ufssel;
706 regs->tf_es = _udatasel;
707 regs->tf_ds = _udatasel;
708 regs->tf_ss = _udatasel;
709 regs->tf_flags = TF_HASSEGS;
710 regs->tf_cs = _ucode32sel;
711 regs->tf_rbx = (register_t)imgp->ps_strings;
715 /* Do full restore on return so that we can change to a different %cs */
716 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);
720 * XXX copied from ia32_sysvec.c.
723 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
725 int argc, envc, error;
728 uintptr_t destp, ustringp;
729 struct linux32_ps_strings *arginfo;
730 char canary[LINUX_AT_RANDOM_LEN];
733 /* Calculate string base and vector table pointers. */
734 if (imgp->execpath != NULL && imgp->auxargs != NULL)
735 execpath_len = strlen(imgp->execpath) + 1;
739 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS;
740 destp = (uintptr_t)arginfo;
742 if (execpath_len != 0) {
743 destp -= execpath_len;
744 destp = rounddown2(destp, sizeof(uint32_t));
745 imgp->execpathp = (void *)destp;
746 error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
751 /* Prepare the canary for SSP. */
752 arc4rand(canary, sizeof(canary), 0);
753 destp -= roundup(sizeof(canary), sizeof(uint32_t));
754 imgp->canary = (void *)destp;
755 error = copyout(canary, imgp->canary, sizeof(canary));
759 /* Allocate room for the argument and environment strings. */
760 destp -= ARG_MAX - imgp->args->stringspace;
761 destp = rounddown2(destp, sizeof(uint32_t));
766 * Allocate room on the stack for the ELF auxargs
767 * array. It has LINUX_AT_COUNT entries.
769 destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo);
770 destp = rounddown2(destp, sizeof(uint32_t));
773 vectp = (uint32_t *)destp;
776 * Allocate room for the argv[] and env vectors including the
777 * terminating NULL pointers.
779 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
781 /* vectp also becomes our initial stack base. */
782 *stack_base = (uintptr_t)vectp;
784 stringp = imgp->args->begin_argv;
785 argc = imgp->args->argc;
786 envc = imgp->args->envc;
788 /* Copy out strings - arguments and environment. */
789 error = copyout(stringp, (void *)ustringp,
790 ARG_MAX - imgp->args->stringspace);
794 /* Fill in "ps_strings" struct for ps, w, etc. */
795 if (suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp) != 0 ||
796 suword32(&arginfo->ps_nargvstr, argc) != 0)
799 /* Fill in argument portion of vector table. */
800 for (; argc > 0; --argc) {
801 if (suword32(vectp++, ustringp) != 0)
803 while (*stringp++ != 0)
808 /* A null vector table pointer separates the argp's from the envp's. */
809 if (suword32(vectp++, 0) != 0)
812 if (suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp) != 0 ||
813 suword32(&arginfo->ps_nenvstr, envc) != 0)
816 /* Fill in environment portion of vector table. */
817 for (; envc > 0; --envc) {
818 if (suword32(vectp++, ustringp) != 0)
820 while (*stringp++ != 0)
825 /* The end of the vector table is a null pointer. */
826 if (suword32(vectp, 0) != 0)
831 error = imgp->sysent->sv_copyout_auxargs(imgp,
840 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
841 "32-bit Linux emulation");
843 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ;
844 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW,
845 &linux32_maxdsiz, 0, "");
846 static u_long linux32_maxssiz = LINUX32_MAXSSIZ;
847 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW,
848 &linux32_maxssiz, 0, "");
849 static u_long linux32_maxvmem = LINUX32_MAXVMEM;
850 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW,
851 &linux32_maxvmem, 0, "");
854 linux32_fixlimit(struct rlimit *rl, int which)
859 if (linux32_maxdsiz != 0) {
860 if (rl->rlim_cur > linux32_maxdsiz)
861 rl->rlim_cur = linux32_maxdsiz;
862 if (rl->rlim_max > linux32_maxdsiz)
863 rl->rlim_max = linux32_maxdsiz;
867 if (linux32_maxssiz != 0) {
868 if (rl->rlim_cur > linux32_maxssiz)
869 rl->rlim_cur = linux32_maxssiz;
870 if (rl->rlim_max > linux32_maxssiz)
871 rl->rlim_max = linux32_maxssiz;
875 if (linux32_maxvmem != 0) {
876 if (rl->rlim_cur > linux32_maxvmem)
877 rl->rlim_cur = linux32_maxvmem;
878 if (rl->rlim_max > linux32_maxvmem)
879 rl->rlim_max = linux32_maxvmem;
885 struct sysentvec elf_linux_sysvec = {
886 .sv_size = LINUX32_SYS_MAXSYSCALL,
887 .sv_table = linux32_sysent,
888 .sv_errsize = ELAST + 1,
889 .sv_errtbl = linux_errtbl,
890 .sv_transtrap = linux_translate_traps,
891 .sv_fixup = linux_fixup_elf,
892 .sv_sendsig = linux_sendsig,
893 .sv_sigcode = &_binary_linux32_locore_o_start,
894 .sv_szsigcode = &linux_szsigcode,
895 .sv_name = "Linux ELF32",
896 .sv_coredump = elf32_coredump,
897 .sv_imgact_try = linux_exec_imgact_try,
898 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
899 .sv_minuser = VM_MIN_ADDRESS,
900 .sv_maxuser = LINUX32_MAXUSER,
901 .sv_usrstack = LINUX32_USRSTACK,
902 .sv_psstrings = LINUX32_PS_STRINGS,
903 .sv_stackprot = VM_PROT_ALL,
904 .sv_copyout_auxargs = linux_copyout_auxargs,
905 .sv_copyout_strings = linux_copyout_strings,
906 .sv_setregs = linux_exec_setregs,
907 .sv_fixlimit = linux32_fixlimit,
908 .sv_maxssiz = &linux32_maxssiz,
909 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP,
910 .sv_set_syscall_retval = cpu_set_syscall_retval,
911 .sv_fetch_syscall_args = linux32_fetch_syscall_args,
912 .sv_syscallnames = NULL,
913 .sv_shared_page_base = LINUX32_SHAREDPAGE,
914 .sv_shared_page_len = PAGE_SIZE,
915 .sv_schedtail = linux_schedtail,
916 .sv_thread_detach = linux_thread_detach,
921 linux_vdso_install(void *param)
924 linux_szsigcode = (&_binary_linux32_locore_o_end -
925 &_binary_linux32_locore_o_start);
927 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
928 panic("Linux invalid vdso size\n");
930 __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
932 linux_shared_page_obj = __elfN(linux_shared_page_init)
933 (&linux_shared_page_mapping);
935 __elfN(linux_vdso_reloc)(&elf_linux_sysvec);
937 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
939 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
941 linux_kplatform = linux_shared_page_mapping +
942 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base);
944 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
945 linux_vdso_install, NULL);
948 linux_vdso_deinstall(void *param)
951 __elfN(linux_shared_page_fini)(linux_shared_page_obj);
953 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
954 linux_vdso_deinstall, NULL);
956 static char GNU_ABI_VENDOR[] = "GNU";
957 static int GNULINUX_ABI_DESC = 0;
960 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel)
962 const Elf32_Word *desc;
965 p = (uintptr_t)(note + 1);
966 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
968 desc = (const Elf32_Word *)p;
969 if (desc[0] != GNULINUX_ABI_DESC)
973 * For Linux we encode osrel using the Linux convention of
974 * (version << 16) | (major << 8) | (minor)
975 * See macro in linux_mib.h
977 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
982 static Elf_Brandnote linux32_brandnote = {
983 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
984 .hdr.n_descsz = 16, /* XXX at least 16 */
986 .vendor = GNU_ABI_VENDOR,
987 .flags = BN_TRANSLATE_OSREL,
988 .trans_osrel = linux32_trans_osrel
991 static Elf32_Brandinfo linux_brand = {
992 .brand = ELFOSABI_LINUX,
994 .compat_3_brand = "Linux",
995 .emul_path = linux_emul_path,
996 .interp_path = "/lib/ld-linux.so.1",
997 .sysvec = &elf_linux_sysvec,
998 .interp_newpath = NULL,
999 .brand_note = &linux32_brandnote,
1000 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
1003 static Elf32_Brandinfo linux_glibc2brand = {
1004 .brand = ELFOSABI_LINUX,
1006 .compat_3_brand = "Linux",
1007 .emul_path = linux_emul_path,
1008 .interp_path = "/lib/ld-linux.so.2",
1009 .sysvec = &elf_linux_sysvec,
1010 .interp_newpath = NULL,
1011 .brand_note = &linux32_brandnote,
1012 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
1015 static Elf32_Brandinfo linux_muslbrand = {
1016 .brand = ELFOSABI_LINUX,
1018 .compat_3_brand = "Linux",
1019 .emul_path = linux_emul_path,
1020 .interp_path = "/lib/ld-musl-i386.so.1",
1021 .sysvec = &elf_linux_sysvec,
1022 .interp_newpath = NULL,
1023 .brand_note = &linux32_brandnote,
1024 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
1027 Elf32_Brandinfo *linux_brandlist[] = {
1035 linux_elf_modevent(module_t mod, int type, void *data)
1037 Elf32_Brandinfo **brandinfo;
1039 struct linux_ioctl_handler **lihp;
1045 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
1047 if (elf32_insert_brand_entry(*brandinfo) < 0)
1050 SET_FOREACH(lihp, linux_ioctl_handler_set)
1051 linux32_ioctl_register_handler(*lihp);
1052 stclohz = (stathz ? stathz : hz);
1054 printf("Linux ELF exec handler installed\n");
1056 printf("cannot insert Linux ELF brand handler\n");
1059 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
1061 if (elf32_brand_inuse(*brandinfo))
1064 for (brandinfo = &linux_brandlist[0];
1065 *brandinfo != NULL; ++brandinfo)
1066 if (elf32_remove_brand_entry(*brandinfo) < 0)
1070 SET_FOREACH(lihp, linux_ioctl_handler_set)
1071 linux32_ioctl_unregister_handler(*lihp);
1073 printf("Linux ELF exec handler removed\n");
1075 printf("Could not deinstall ELF interpreter entry\n");
1078 return (EOPNOTSUPP);
1083 static moduledata_t linux_elf_mod = {
1089 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
1090 MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1);
1091 FEATURE(linux, "Linux 32bit support");