2 * Copyright (c) 2013 Dmitry Chagin
3 * Copyright (c) 2004 Tim J. Robbins
4 * Copyright (c) 2003 Peter Wemm
5 * Copyright (c) 2002 Doug Rabson
6 * Copyright (c) 1998-1999 Andrew Gallatin
7 * Copyright (c) 1994-1996 Søren Schmidt
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer
15 * in this position and unchanged.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #define __ELF_WORD_SIZE 64
39 #include <sys/param.h>
40 #include <sys/systm.h>
42 #include <sys/fcntl.h>
43 #include <sys/imgact.h>
44 #include <sys/imgact_elf.h>
45 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/module.h>
50 #include <sys/mutex.h>
52 #include <sys/resourcevar.h>
53 #include <sys/signalvar.h>
54 #include <sys/syscallsubr.h>
55 #include <sys/sysctl.h>
56 #include <sys/sysent.h>
57 #include <sys/sysproto.h>
58 #include <sys/vnode.h>
59 #include <sys/eventhandler.h>
63 #include <vm/vm_extern.h>
64 #include <vm/vm_map.h>
65 #include <vm/vm_object.h>
66 #include <vm/vm_page.h>
67 #include <vm/vm_param.h>
69 #include <machine/cpu.h>
70 #include <machine/md_var.h>
71 #include <machine/pcb.h>
72 #include <machine/specialreg.h>
73 #include <machine/trap.h>
75 #include <amd64/linux/linux.h>
76 #include <amd64/linux/linux_proto.h>
77 #include <compat/linux/linux_emul.h>
78 #include <compat/linux/linux_ioctl.h>
79 #include <compat/linux/linux_mib.h>
80 #include <compat/linux/linux_misc.h>
81 #include <compat/linux/linux_signal.h>
82 #include <compat/linux/linux_sysproto.h>
83 #include <compat/linux/linux_util.h>
84 #include <compat/linux/linux_vdso.h>
86 MODULE_VERSION(linux64, 1);
88 const char *linux_kplatform;
89 static int linux_szsigcode;
90 static vm_object_t linux_shared_page_obj;
91 static char *linux_shared_page_mapping;
92 extern char _binary_linux_locore_o_start;
93 extern char _binary_linux_locore_o_end;
95 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
97 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
99 static register_t * linux_copyout_strings(struct image_params *imgp);
100 static int linux_fixup_elf(register_t **stack_base,
101 struct image_params *iparams);
102 static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
103 static void linux_vdso_install(void *param);
104 static void linux_vdso_deinstall(void *param);
105 static void linux_set_syscall_retval(struct thread *td, int error);
106 static int linux_fetch_syscall_args(struct thread *td);
107 static void linux_exec_setregs(struct thread *td, struct image_params *imgp,
109 static int linux_vsyscall(struct thread *td);
111 #define LINUX_T_UNKNOWN 255
112 static int _bsd_to_linux_trapcode[] = {
113 LINUX_T_UNKNOWN, /* 0 */
114 6, /* 1 T_PRIVINFLT */
115 LINUX_T_UNKNOWN, /* 2 */
117 LINUX_T_UNKNOWN, /* 4 */
118 LINUX_T_UNKNOWN, /* 5 */
119 16, /* 6 T_ARITHTRAP */
120 254, /* 7 T_ASTFLT */
121 LINUX_T_UNKNOWN, /* 8 */
122 13, /* 9 T_PROTFLT */
123 1, /* 10 T_TRCTRAP */
124 LINUX_T_UNKNOWN, /* 11 */
125 14, /* 12 T_PAGEFLT */
126 LINUX_T_UNKNOWN, /* 13 */
127 17, /* 14 T_ALIGNFLT */
128 LINUX_T_UNKNOWN, /* 15 */
129 LINUX_T_UNKNOWN, /* 16 */
130 LINUX_T_UNKNOWN, /* 17 */
136 8, /* 23 T_DOUBLEFLT */
137 9, /* 24 T_FPOPFLT */
138 10, /* 25 T_TSSFLT */
139 11, /* 26 T_SEGNPFLT */
140 12, /* 27 T_STKFLT */
142 19, /* 29 T_XMMFLT */
143 15 /* 30 T_RESERVED */
145 #define bsd_to_linux_trapcode(code) \
146 ((code)<nitems(_bsd_to_linux_trapcode)? \
147 _bsd_to_linux_trapcode[(code)]: \
150 LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode);
151 LINUX_VDSO_SYM_CHAR(linux_platform);
154 * If FreeBSD & Linux have a difference of opinion about what a trap
155 * means, deal with it here.
160 linux_translate_traps(int signal, int trap_code)
163 if (signal != SIGBUS)
177 linux_fetch_syscall_args(struct thread *td)
180 struct trapframe *frame;
181 struct syscall_args *sa;
184 frame = td->td_frame;
187 sa->args[0] = frame->tf_rdi;
188 sa->args[1] = frame->tf_rsi;
189 sa->args[2] = frame->tf_rdx;
190 sa->args[3] = frame->tf_rcx;
191 sa->args[4] = frame->tf_r8;
192 sa->args[5] = frame->tf_r9;
193 sa->code = frame->tf_rax;
195 if (sa->code >= p->p_sysent->sv_size)
197 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
199 sa->callp = &p->p_sysent->sv_table[sa->code];
200 sa->narg = sa->callp->sy_narg;
202 td->td_retval[0] = 0;
207 linux_set_syscall_retval(struct thread *td, int error)
209 struct trapframe *frame = td->td_frame;
212 * On Linux only %rcx and %r11 values are not preserved across
213 * the syscall. So, do not clobber %rdx and %r10.
215 td->td_retval[1] = frame->tf_rdx;
216 if (error != EJUSTRETURN)
217 frame->tf_r10 = frame->tf_rcx;
219 cpu_set_syscall_retval(td, error);
221 /* Restore all registers. */
222 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
226 linux_fixup_elf(register_t **stack_base, struct image_params *imgp)
229 Elf_Auxinfo *argarray, *pos;
230 Elf_Addr *auxbase, *base;
231 struct ps_strings *arginfo;
233 int error, issetugid;
236 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
238 KASSERT(curthread->td_proc == imgp->proc,
239 ("unsafe linux_fixup_elf(), should be curproc"));
240 base = (Elf64_Addr *)*stack_base;
241 args = (Elf64_Auxargs *)imgp->auxargs;
242 auxbase = base + imgp->args->argc + 1 + imgp->args->envc + 1;
243 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
246 issetugid = p->p_flag & P_SUGID ? 1 : 0;
247 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
248 imgp->proc->p_sysent->sv_shared_page_base);
249 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
250 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
251 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
252 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
253 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
254 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
255 AUXARGS_ENTRY(pos, AT_BASE, args->base);
256 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
257 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
258 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
259 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
260 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
261 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
262 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
263 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
264 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary);
265 if (imgp->execpathp != 0)
266 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp);
267 if (args->execfd != -1)
268 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
269 AUXARGS_ENTRY(pos, AT_NULL, 0);
270 free(imgp->auxargs, M_TEMP);
271 imgp->auxargs = NULL;
272 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
274 error = copyout(argarray, auxbase, sizeof(*argarray) * LINUX_AT_COUNT);
275 free(argarray, M_TEMP);
280 if (suword(base, (uint64_t)imgp->args->argc) == -1)
283 *stack_base = (register_t *)base;
288 * Copy strings out to the new process address space, constructing new arg
289 * and env vector tables. Return a pointer to the base so that it can be used
290 * as the initial stack pointer.
293 linux_copyout_strings(struct image_params *imgp)
297 char *stringp, *destp;
298 register_t *stack_base;
299 struct ps_strings *arginfo;
300 char canary[LINUX_AT_RANDOM_LEN];
304 /* Calculate string base and vector table pointers. */
305 if (imgp->execpath != NULL && imgp->auxargs != NULL)
306 execpath_len = strlen(imgp->execpath) + 1;
311 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
312 destp = (caddr_t)arginfo - SPARE_USRSPACE -
313 roundup(sizeof(canary), sizeof(char *)) -
314 roundup(execpath_len, sizeof(char *)) -
315 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));
317 if (execpath_len != 0) {
318 imgp->execpathp = (uintptr_t)arginfo - execpath_len;
319 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len);
322 /* Prepare the canary for SSP. */
323 arc4rand(canary, sizeof(canary), 0);
324 imgp->canary = (uintptr_t)arginfo -
325 roundup(execpath_len, sizeof(char *)) -
326 roundup(sizeof(canary), sizeof(char *));
327 copyout(canary, (void *)imgp->canary, sizeof(canary));
329 vectp = (char **)destp;
332 * Allocate room on the stack for the ELF auxargs
333 * array. It has LINUX_AT_COUNT entries.
335 vectp -= howmany(LINUX_AT_COUNT * sizeof(Elf64_Auxinfo),
340 * Allocate room for the argv[] and env vectors including the
341 * terminating NULL pointers.
343 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
346 * Starting with 2.24, glibc depends on a 16-byte stack alignment.
347 * One "long argc" will be prepended later.
349 vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8);
351 /* vectp also becomes our initial stack base. */
352 stack_base = (register_t *)vectp;
354 stringp = imgp->args->begin_argv;
355 argc = imgp->args->argc;
356 envc = imgp->args->envc;
358 /* Copy out strings - arguments and environment. */
359 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
361 /* Fill in "ps_strings" struct for ps, w, etc. */
362 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp);
363 suword(&arginfo->ps_nargvstr, argc);
365 /* Fill in argument portion of vector table. */
366 for (; argc > 0; --argc) {
367 suword(vectp++, (long)(intptr_t)destp);
368 while (*stringp++ != 0)
373 /* A null vector table pointer separates the argp's from the envp's. */
376 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp);
377 suword(&arginfo->ps_nenvstr, envc);
379 /* Fill in environment portion of vector table. */
380 for (; envc > 0; --envc) {
381 suword(vectp++, (long)(intptr_t)destp);
382 while (*stringp++ != 0)
387 /* The end of the vector table is a null pointer. */
393 * Reset registers to default values on exec.
396 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
398 struct trapframe *regs;
400 register_t saved_rflags;
405 if (td->td_proc->p_md.md_ldt != NULL)
410 clear_pcb_flags(pcb, PCB_32BIT);
411 pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
412 set_pcb_flags(pcb, PCB_FULL_IRET);
414 saved_rflags = regs->tf_rflags & PSL_T;
415 bzero((char *)regs, sizeof(struct trapframe));
416 regs->tf_rip = imgp->entry_addr;
417 regs->tf_rsp = stack;
418 regs->tf_rflags = PSL_USER | saved_rflags;
419 regs->tf_ss = _udatasel;
420 regs->tf_cs = _ucodesel;
421 regs->tf_ds = _udatasel;
422 regs->tf_es = _udatasel;
423 regs->tf_fs = _ufssel;
424 regs->tf_gs = _ugssel;
425 regs->tf_flags = TF_HASSEGS;
428 * Reset the hardware debug registers if they were in use.
429 * They won't have any meaning for the newly exec'd process.
431 if (pcb->pcb_flags & PCB_DBREGS) {
440 * Clear the debug registers on the running
441 * CPU, otherwise they will end up affecting
442 * the next process we switch to.
446 clear_pcb_flags(pcb, PCB_DBREGS);
450 * Drop the FP state if we hold it, so that the process gets a
451 * clean FP state if it uses the FPU again.
457 * Copied from amd64/amd64/machdep.c
459 * XXX fpu state need? don't think so
462 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
465 struct l_ucontext uc;
466 struct l_sigcontext *context;
467 struct trapframe *regs;
468 unsigned long rflags;
473 error = copyin((void *)regs->tf_rbx, &uc, sizeof(uc));
478 context = &uc.uc_mcontext;
479 rflags = context->sc_rflags;
482 * Don't allow users to change privileged or reserved flags.
485 * XXX do allow users to change the privileged flag PSL_RF.
486 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers
487 * should sometimes set it there too. tf_rflags is kept in
488 * the signal context during signal handling and there is no
489 * other place to remember it, so the PSL_RF bit may be
490 * corrupted by the signal handler without us knowing.
491 * Corruption of the PSL_RF bit at worst causes one more or
492 * one less debugger trap, so allowing it is fairly harmless.
495 #define RFLAG_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
496 if (!RFLAG_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
497 printf("linux_rt_sigreturn: rflags = 0x%lx\n", rflags);
502 * Don't allow users to load a valid privileged %cs. Let the
503 * hardware check for invalid selectors, excess privilege in
504 * other selectors, invalid %eip's and invalid %esp's.
506 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
507 if (!CS_SECURE(context->sc_cs)) {
508 printf("linux_rt_sigreturn: cs = 0x%x\n", context->sc_cs);
509 ksiginfo_init_trap(&ksi);
510 ksi.ksi_signo = SIGBUS;
511 ksi.ksi_code = BUS_OBJERR;
512 ksi.ksi_trapno = T_PROTFLT;
513 ksi.ksi_addr = (void *)regs->tf_rip;
514 trapsignal(td, &ksi);
519 linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask);
520 SIG_CANTMASK(td->td_sigmask);
524 regs->tf_rdi = context->sc_rdi;
525 regs->tf_rsi = context->sc_rsi;
526 regs->tf_rdx = context->sc_rdx;
527 regs->tf_rbp = context->sc_rbp;
528 regs->tf_rbx = context->sc_rbx;
529 regs->tf_rcx = context->sc_rcx;
530 regs->tf_rax = context->sc_rax;
531 regs->tf_rip = context->sc_rip;
532 regs->tf_rsp = context->sc_rsp;
533 regs->tf_r8 = context->sc_r8;
534 regs->tf_r9 = context->sc_r9;
535 regs->tf_r10 = context->sc_r10;
536 regs->tf_r11 = context->sc_r11;
537 regs->tf_r12 = context->sc_r12;
538 regs->tf_r13 = context->sc_r13;
539 regs->tf_r14 = context->sc_r14;
540 regs->tf_r15 = context->sc_r15;
541 regs->tf_cs = context->sc_cs;
542 regs->tf_err = context->sc_err;
543 regs->tf_rflags = rflags;
545 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
546 return (EJUSTRETURN);
550 * copied from amd64/amd64/machdep.c
552 * Send an interrupt to process.
555 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
557 struct l_rt_sigframe sf, *sfp;
562 struct trapframe *regs;
568 PROC_LOCK_ASSERT(p, MA_OWNED);
569 sig = ksi->ksi_signo;
571 code = ksi->ksi_code;
572 mtx_assert(&psp->ps_mtx, MA_OWNED);
574 oonstack = sigonstack(regs->tf_rsp);
576 LINUX_CTR4(rt_sendsig, "%p, %d, %p, %u",
577 catcher, sig, mask, code);
579 /* Allocate space for the signal handler context. */
580 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
581 SIGISMEMBER(psp->ps_sigonstack, sig)) {
582 sp = (caddr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size -
583 sizeof(struct l_rt_sigframe);
585 sp = (caddr_t)regs->tf_rsp - sizeof(struct l_rt_sigframe) - 128;
586 /* Align to 16 bytes. */
587 sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul);
588 mtx_unlock(&psp->ps_mtx);
590 /* Translate the signal. */
591 sig = bsd_to_linux_signal(sig);
593 /* Save user context. */
594 bzero(&sf, sizeof(sf));
595 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_sigmask);
596 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_mcontext.sc_mask);
598 sf.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
599 sf.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
600 sf.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
601 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
604 sf.sf_sc.uc_mcontext.sc_rdi = regs->tf_rdi;
605 sf.sf_sc.uc_mcontext.sc_rsi = regs->tf_rsi;
606 sf.sf_sc.uc_mcontext.sc_rdx = regs->tf_rdx;
607 sf.sf_sc.uc_mcontext.sc_rbp = regs->tf_rbp;
608 sf.sf_sc.uc_mcontext.sc_rbx = regs->tf_rbx;
609 sf.sf_sc.uc_mcontext.sc_rcx = regs->tf_rcx;
610 sf.sf_sc.uc_mcontext.sc_rax = regs->tf_rax;
611 sf.sf_sc.uc_mcontext.sc_rip = regs->tf_rip;
612 sf.sf_sc.uc_mcontext.sc_rsp = regs->tf_rsp;
613 sf.sf_sc.uc_mcontext.sc_r8 = regs->tf_r8;
614 sf.sf_sc.uc_mcontext.sc_r9 = regs->tf_r9;
615 sf.sf_sc.uc_mcontext.sc_r10 = regs->tf_r10;
616 sf.sf_sc.uc_mcontext.sc_r11 = regs->tf_r11;
617 sf.sf_sc.uc_mcontext.sc_r12 = regs->tf_r12;
618 sf.sf_sc.uc_mcontext.sc_r13 = regs->tf_r13;
619 sf.sf_sc.uc_mcontext.sc_r14 = regs->tf_r14;
620 sf.sf_sc.uc_mcontext.sc_r15 = regs->tf_r15;
621 sf.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
622 sf.sf_sc.uc_mcontext.sc_rflags = regs->tf_rflags;
623 sf.sf_sc.uc_mcontext.sc_err = regs->tf_err;
624 sf.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
625 sf.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr;
627 /* Build the argument list for the signal handler. */
628 regs->tf_rdi = sig; /* arg 1 in %rdi */
630 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
631 regs->tf_rdx = (register_t)&sfp->sf_sc; /* arg 3 in %rdx */
633 sf.sf_handler = catcher;
634 /* Fill in POSIX parts. */
635 ksiginfo_to_lsiginfo(ksi, &sf.sf_si, sig);
637 /* Copy the sigframe out to the user's stack. */
638 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
643 regs->tf_rsp = (long)sfp;
644 regs->tf_rip = linux_rt_sigcode;
645 regs->tf_rflags &= ~(PSL_T | PSL_D);
646 regs->tf_cs = _ucodesel;
647 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
649 mtx_lock(&psp->ps_mtx);
652 #define LINUX_VSYSCALL_START (-10UL << 20)
653 #define LINUX_VSYSCALL_SZ 1024
655 const unsigned long linux_vsyscall_vector[] = {
656 LINUX_SYS_gettimeofday,
657 LINUX_SYS_linux_time,
658 /* getcpu not implemented */
662 linux_vsyscall(struct thread *td)
664 struct trapframe *frame;
669 frame = td->td_frame;
671 /* Check %rip for vsyscall area. */
672 if (__predict_true(frame->tf_rip < LINUX_VSYSCALL_START))
674 if ((frame->tf_rip & (LINUX_VSYSCALL_SZ - 1)) != 0)
676 code = (frame->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SZ;
677 if (code >= nitems(linux_vsyscall_vector))
681 * vsyscall called as callq *(%rax), so we must
682 * use return address from %rsp and also fixup %rsp.
684 error = copyin((void *)frame->tf_rsp, &retqaddr, sizeof(retqaddr));
688 frame->tf_rip = retqaddr;
689 frame->tf_rax = linux_vsyscall_vector[code];
692 traced = (frame->tf_flags & PSL_T);
694 amd64_syscall(td, traced);
699 struct sysentvec elf_linux_sysvec = {
700 .sv_size = LINUX_SYS_MAXSYSCALL,
701 .sv_table = linux_sysent,
702 .sv_errsize = ELAST + 1,
703 .sv_errtbl = linux_errtbl,
704 .sv_transtrap = linux_translate_traps,
705 .sv_fixup = linux_fixup_elf,
706 .sv_sendsig = linux_rt_sendsig,
707 .sv_sigcode = &_binary_linux_locore_o_start,
708 .sv_szsigcode = &linux_szsigcode,
709 .sv_name = "Linux ELF64",
710 .sv_coredump = elf64_coredump,
711 .sv_imgact_try = linux_exec_imgact_try,
712 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
713 .sv_minuser = VM_MIN_ADDRESS,
714 .sv_maxuser = VM_MAXUSER_ADDRESS,
715 .sv_usrstack = USRSTACK,
716 .sv_psstrings = PS_STRINGS,
717 .sv_stackprot = VM_PROT_ALL,
718 .sv_copyout_strings = linux_copyout_strings,
719 .sv_setregs = linux_exec_setregs,
722 .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP,
723 .sv_set_syscall_retval = linux_set_syscall_retval,
724 .sv_fetch_syscall_args = linux_fetch_syscall_args,
725 .sv_syscallnames = NULL,
726 .sv_shared_page_base = SHAREDPAGE,
727 .sv_shared_page_len = PAGE_SIZE,
728 .sv_schedtail = linux_schedtail,
729 .sv_thread_detach = linux_thread_detach,
730 .sv_trap = linux_vsyscall,
734 linux_vdso_install(void *param)
737 amd64_lower_shared_page(&elf_linux_sysvec);
739 linux_szsigcode = (&_binary_linux_locore_o_end -
740 &_binary_linux_locore_o_start);
742 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
743 panic("Linux invalid vdso size\n");
745 __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
747 linux_shared_page_obj = __elfN(linux_shared_page_init)
748 (&linux_shared_page_mapping);
750 __elfN(linux_vdso_reloc)(&elf_linux_sysvec);
752 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
754 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
756 linux_kplatform = linux_shared_page_mapping +
757 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base);
759 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
760 linux_vdso_install, NULL);
763 linux_vdso_deinstall(void *param)
766 __elfN(linux_shared_page_fini)(linux_shared_page_obj);
768 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
769 linux_vdso_deinstall, NULL);
771 static char GNULINUX_ABI_VENDOR[] = "GNU";
772 static int GNULINUX_ABI_DESC = 0;
775 linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
777 const Elf32_Word *desc;
780 p = (uintptr_t)(note + 1);
781 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
783 desc = (const Elf32_Word *)p;
784 if (desc[0] != GNULINUX_ABI_DESC)
788 * For Linux we encode osrel using the Linux convention of
789 * (version << 16) | (major << 8) | (minor)
790 * See macro in linux_mib.h
792 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
797 static Elf_Brandnote linux64_brandnote = {
798 .hdr.n_namesz = sizeof(GNULINUX_ABI_VENDOR),
801 .vendor = GNULINUX_ABI_VENDOR,
802 .flags = BN_TRANSLATE_OSREL,
803 .trans_osrel = linux_trans_osrel
806 static Elf64_Brandinfo linux_glibc2brand = {
807 .brand = ELFOSABI_LINUX,
808 .machine = EM_X86_64,
809 .compat_3_brand = "Linux",
810 .emul_path = "/compat/linux",
811 .interp_path = "/lib64/ld-linux-x86-64.so.2",
812 .sysvec = &elf_linux_sysvec,
813 .interp_newpath = NULL,
814 .brand_note = &linux64_brandnote,
815 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
818 static Elf64_Brandinfo linux_glibc2brandshort = {
819 .brand = ELFOSABI_LINUX,
820 .machine = EM_X86_64,
821 .compat_3_brand = "Linux",
822 .emul_path = "/compat/linux",
823 .interp_path = "/lib64/ld-linux.so.2",
824 .sysvec = &elf_linux_sysvec,
825 .interp_newpath = NULL,
826 .brand_note = &linux64_brandnote,
827 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
830 static Elf64_Brandinfo linux_muslbrand = {
831 .brand = ELFOSABI_LINUX,
832 .machine = EM_X86_64,
833 .compat_3_brand = "Linux",
834 .emul_path = "/compat/linux",
835 .interp_path = "/lib/ld-musl-x86_64.so.1",
836 .sysvec = &elf_linux_sysvec,
837 .interp_newpath = NULL,
838 .brand_note = &linux64_brandnote,
839 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
842 Elf64_Brandinfo *linux_brandlist[] = {
844 &linux_glibc2brandshort,
850 linux64_elf_modevent(module_t mod, int type, void *data)
852 Elf64_Brandinfo **brandinfo;
854 struct linux_ioctl_handler **lihp;
860 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
862 if (elf64_insert_brand_entry(*brandinfo) < 0)
865 SET_FOREACH(lihp, linux_ioctl_handler_set)
866 linux_ioctl_register_handler(*lihp);
867 stclohz = (stathz ? stathz : hz);
869 printf("Linux x86-64 ELF exec handler installed\n");
871 printf("cannot insert Linux x86-64 ELF brand handler\n");
874 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
876 if (elf64_brand_inuse(*brandinfo))
879 for (brandinfo = &linux_brandlist[0];
880 *brandinfo != NULL; ++brandinfo)
881 if (elf64_remove_brand_entry(*brandinfo) < 0)
885 SET_FOREACH(lihp, linux_ioctl_handler_set)
886 linux_ioctl_unregister_handler(*lihp);
888 printf("Linux ELF exec handler removed\n");
890 printf("Could not deinstall ELF interpreter entry\n");
898 static moduledata_t linux64_elf_mod = {
900 linux64_elf_modevent,
904 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
905 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1);
906 FEATURE(linux64, "Linux 64bit support");