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 int linux_copyout_strings(struct image_params *imgp,
100 uintptr_t *stack_base);
101 static int linux_fixup_elf(uintptr_t *stack_base,
102 struct image_params *iparams);
103 static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
104 static void linux_vdso_install(void *param);
105 static void linux_vdso_deinstall(void *param);
106 static void linux_set_syscall_retval(struct thread *td, int error);
107 static int linux_fetch_syscall_args(struct thread *td);
108 static void linux_exec_setregs(struct thread *td, struct image_params *imgp,
110 static int linux_vsyscall(struct thread *td);
112 #define LINUX_T_UNKNOWN 255
113 static int _bsd_to_linux_trapcode[] = {
114 LINUX_T_UNKNOWN, /* 0 */
115 6, /* 1 T_PRIVINFLT */
116 LINUX_T_UNKNOWN, /* 2 */
118 LINUX_T_UNKNOWN, /* 4 */
119 LINUX_T_UNKNOWN, /* 5 */
120 16, /* 6 T_ARITHTRAP */
121 254, /* 7 T_ASTFLT */
122 LINUX_T_UNKNOWN, /* 8 */
123 13, /* 9 T_PROTFLT */
124 1, /* 10 T_TRCTRAP */
125 LINUX_T_UNKNOWN, /* 11 */
126 14, /* 12 T_PAGEFLT */
127 LINUX_T_UNKNOWN, /* 13 */
128 17, /* 14 T_ALIGNFLT */
129 LINUX_T_UNKNOWN, /* 15 */
130 LINUX_T_UNKNOWN, /* 16 */
131 LINUX_T_UNKNOWN, /* 17 */
137 8, /* 23 T_DOUBLEFLT */
138 9, /* 24 T_FPOPFLT */
139 10, /* 25 T_TSSFLT */
140 11, /* 26 T_SEGNPFLT */
141 12, /* 27 T_STKFLT */
143 19, /* 29 T_XMMFLT */
144 15 /* 30 T_RESERVED */
146 #define bsd_to_linux_trapcode(code) \
147 ((code)<nitems(_bsd_to_linux_trapcode)? \
148 _bsd_to_linux_trapcode[(code)]: \
151 LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode);
152 LINUX_VDSO_SYM_CHAR(linux_platform);
155 * If FreeBSD & Linux have a difference of opinion about what a trap
156 * means, deal with it here.
161 linux_translate_traps(int signal, int trap_code)
164 if (signal != SIGBUS)
178 linux_fetch_syscall_args(struct thread *td)
181 struct trapframe *frame;
182 struct syscall_args *sa;
185 frame = td->td_frame;
188 sa->args[0] = frame->tf_rdi;
189 sa->args[1] = frame->tf_rsi;
190 sa->args[2] = frame->tf_rdx;
191 sa->args[3] = frame->tf_rcx;
192 sa->args[4] = frame->tf_r8;
193 sa->args[5] = frame->tf_r9;
194 sa->code = frame->tf_rax;
196 if (sa->code >= p->p_sysent->sv_size)
198 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
200 sa->callp = &p->p_sysent->sv_table[sa->code];
201 sa->narg = sa->callp->sy_narg;
203 td->td_retval[0] = 0;
208 linux_set_syscall_retval(struct thread *td, int error)
210 struct trapframe *frame = td->td_frame;
213 * On Linux only %rcx and %r11 values are not preserved across
214 * the syscall. So, do not clobber %rdx and %r10.
216 td->td_retval[1] = frame->tf_rdx;
217 if (error != EJUSTRETURN)
218 frame->tf_r10 = frame->tf_rcx;
220 cpu_set_syscall_retval(td, error);
222 /* Restore all registers. */
223 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
227 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
230 Elf_Auxinfo *argarray, *pos;
232 int error, issetugid;
235 args = (Elf64_Auxargs *)imgp->auxargs;
236 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
239 issetugid = p->p_flag & P_SUGID ? 1 : 0;
240 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
241 imgp->proc->p_sysent->sv_shared_page_base);
242 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
243 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
244 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
245 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
246 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
247 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
248 AUXARGS_ENTRY(pos, AT_BASE, args->base);
249 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
250 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
251 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
252 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
253 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
254 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
255 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
256 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
257 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary);
258 if (imgp->execpathp != 0)
259 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp);
260 if (args->execfd != -1)
261 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
262 AUXARGS_ENTRY(pos, AT_NULL, 0);
264 free(imgp->auxargs, M_TEMP);
265 imgp->auxargs = NULL;
266 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
268 error = copyout(argarray, (void *)base,
269 sizeof(*argarray) * LINUX_AT_COUNT);
270 free(argarray, M_TEMP);
275 linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp)
279 base = (Elf64_Addr *)*stack_base;
281 if (suword(base, (uint64_t)imgp->args->argc) == -1)
284 *stack_base = (uintptr_t)base;
289 * Copy strings out to the new process address space, constructing new arg
290 * and env vector tables. Return a pointer to the base so that it can be used
291 * as the initial stack pointer.
294 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
296 int argc, envc, error;
299 uintptr_t destp, ustringp;
300 struct ps_strings *arginfo;
301 char canary[LINUX_AT_RANDOM_LEN];
305 /* Calculate string base and vector table pointers. */
306 if (imgp->execpath != NULL && imgp->auxargs != NULL)
307 execpath_len = strlen(imgp->execpath) + 1;
312 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
313 destp = (uintptr_t)arginfo;
315 if (execpath_len != 0) {
316 destp -= execpath_len;
317 destp = rounddown2(destp, sizeof(void *));
318 imgp->execpathp = destp;
319 error = copyout(imgp->execpath, (void *)destp, execpath_len);
324 /* Prepare the canary for SSP. */
325 arc4rand(canary, sizeof(canary), 0);
326 destp -= roundup(sizeof(canary), sizeof(void *));
327 imgp->canary = destp;
328 error = copyout(canary, (void *)destp, sizeof(canary));
332 /* Allocate room for the argument and environment strings. */
333 destp -= ARG_MAX - imgp->args->stringspace;
334 destp = rounddown2(destp, sizeof(void *));
339 * Allocate room on the stack for the ELF auxargs
340 * array. It has LINUX_AT_COUNT entries.
342 destp -= LINUX_AT_COUNT * sizeof(Elf64_Auxinfo);
343 destp = rounddown2(destp, sizeof(void *));
346 vectp = (char **)destp;
349 * Allocate room for the argv[] and env vectors including the
350 * terminating NULL pointers.
352 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
355 * Starting with 2.24, glibc depends on a 16-byte stack alignment.
356 * One "long argc" will be prepended later.
358 vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8);
360 /* vectp also becomes our initial stack base. */
361 *stack_base = (uintptr_t)vectp;
363 stringp = imgp->args->begin_argv;
364 argc = imgp->args->argc;
365 envc = imgp->args->envc;
367 /* Copy out strings - arguments and environment. */
368 error = copyout(stringp, (void *)ustringp,
369 ARG_MAX - imgp->args->stringspace);
373 /* Fill in "ps_strings" struct for ps, w, etc. */
374 if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 ||
375 suword(&arginfo->ps_nargvstr, argc) != 0)
378 /* Fill in argument portion of vector table. */
379 for (; argc > 0; --argc) {
380 if (suword(vectp++, ustringp) != 0)
382 while (*stringp++ != 0)
387 /* A null vector table pointer separates the argp's from the envp's. */
388 if (suword(vectp++, 0) != 0)
391 if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 ||
392 suword(&arginfo->ps_nenvstr, envc) != 0)
395 /* Fill in environment portion of vector table. */
396 for (; envc > 0; --envc) {
397 if (suword(vectp++, ustringp) != 0)
399 while (*stringp++ != 0)
404 /* The end of the vector table is a null pointer. */
405 if (suword(vectp, 0) != 0)
410 error = imgp->sysent->sv_copyout_auxargs(imgp,
420 * Reset registers to default values on exec.
423 linux_exec_setregs(struct thread *td, struct image_params *imgp,
426 struct trapframe *regs;
428 register_t saved_rflags;
433 if (td->td_proc->p_md.md_ldt != NULL)
438 clear_pcb_flags(pcb, PCB_32BIT);
439 pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
440 set_pcb_flags(pcb, PCB_FULL_IRET);
442 saved_rflags = regs->tf_rflags & PSL_T;
443 bzero((char *)regs, sizeof(struct trapframe));
444 regs->tf_rip = imgp->entry_addr;
445 regs->tf_rsp = stack;
446 regs->tf_rflags = PSL_USER | saved_rflags;
447 regs->tf_ss = _udatasel;
448 regs->tf_cs = _ucodesel;
449 regs->tf_ds = _udatasel;
450 regs->tf_es = _udatasel;
451 regs->tf_fs = _ufssel;
452 regs->tf_gs = _ugssel;
453 regs->tf_flags = TF_HASSEGS;
456 * Reset the hardware debug registers if they were in use.
457 * They won't have any meaning for the newly exec'd process.
459 if (pcb->pcb_flags & PCB_DBREGS) {
468 * Clear the debug registers on the running
469 * CPU, otherwise they will end up affecting
470 * the next process we switch to.
474 clear_pcb_flags(pcb, PCB_DBREGS);
478 * Drop the FP state if we hold it, so that the process gets a
479 * clean FP state if it uses the FPU again.
485 * Copied from amd64/amd64/machdep.c
487 * XXX fpu state need? don't think so
490 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
493 struct l_ucontext uc;
494 struct l_sigcontext *context;
495 struct trapframe *regs;
496 unsigned long rflags;
501 error = copyin((void *)regs->tf_rbx, &uc, sizeof(uc));
506 context = &uc.uc_mcontext;
507 rflags = context->sc_rflags;
510 * Don't allow users to change privileged or reserved flags.
513 * XXX do allow users to change the privileged flag PSL_RF.
514 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers
515 * should sometimes set it there too. tf_rflags is kept in
516 * the signal context during signal handling and there is no
517 * other place to remember it, so the PSL_RF bit may be
518 * corrupted by the signal handler without us knowing.
519 * Corruption of the PSL_RF bit at worst causes one more or
520 * one less debugger trap, so allowing it is fairly harmless.
523 #define RFLAG_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
524 if (!RFLAG_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
525 printf("linux_rt_sigreturn: rflags = 0x%lx\n", rflags);
530 * Don't allow users to load a valid privileged %cs. Let the
531 * hardware check for invalid selectors, excess privilege in
532 * other selectors, invalid %eip's and invalid %esp's.
534 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
535 if (!CS_SECURE(context->sc_cs)) {
536 printf("linux_rt_sigreturn: cs = 0x%x\n", context->sc_cs);
537 ksiginfo_init_trap(&ksi);
538 ksi.ksi_signo = SIGBUS;
539 ksi.ksi_code = BUS_OBJERR;
540 ksi.ksi_trapno = T_PROTFLT;
541 ksi.ksi_addr = (void *)regs->tf_rip;
542 trapsignal(td, &ksi);
547 linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask);
548 SIG_CANTMASK(td->td_sigmask);
552 regs->tf_rdi = context->sc_rdi;
553 regs->tf_rsi = context->sc_rsi;
554 regs->tf_rdx = context->sc_rdx;
555 regs->tf_rbp = context->sc_rbp;
556 regs->tf_rbx = context->sc_rbx;
557 regs->tf_rcx = context->sc_rcx;
558 regs->tf_rax = context->sc_rax;
559 regs->tf_rip = context->sc_rip;
560 regs->tf_rsp = context->sc_rsp;
561 regs->tf_r8 = context->sc_r8;
562 regs->tf_r9 = context->sc_r9;
563 regs->tf_r10 = context->sc_r10;
564 regs->tf_r11 = context->sc_r11;
565 regs->tf_r12 = context->sc_r12;
566 regs->tf_r13 = context->sc_r13;
567 regs->tf_r14 = context->sc_r14;
568 regs->tf_r15 = context->sc_r15;
569 regs->tf_cs = context->sc_cs;
570 regs->tf_err = context->sc_err;
571 regs->tf_rflags = rflags;
573 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
574 return (EJUSTRETURN);
578 * copied from amd64/amd64/machdep.c
580 * Send an interrupt to process.
583 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
585 struct l_rt_sigframe sf, *sfp;
590 struct trapframe *regs;
596 PROC_LOCK_ASSERT(p, MA_OWNED);
597 sig = ksi->ksi_signo;
599 code = ksi->ksi_code;
600 mtx_assert(&psp->ps_mtx, MA_OWNED);
602 oonstack = sigonstack(regs->tf_rsp);
604 LINUX_CTR4(rt_sendsig, "%p, %d, %p, %u",
605 catcher, sig, mask, code);
607 /* Allocate space for the signal handler context. */
608 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
609 SIGISMEMBER(psp->ps_sigonstack, sig)) {
610 sp = (caddr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size -
611 sizeof(struct l_rt_sigframe);
613 sp = (caddr_t)regs->tf_rsp - sizeof(struct l_rt_sigframe) - 128;
614 /* Align to 16 bytes. */
615 sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul);
616 mtx_unlock(&psp->ps_mtx);
618 /* Translate the signal. */
619 sig = bsd_to_linux_signal(sig);
621 /* Save user context. */
622 bzero(&sf, sizeof(sf));
623 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_sigmask);
624 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_mcontext.sc_mask);
626 sf.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
627 sf.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
628 sf.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
629 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
632 sf.sf_sc.uc_mcontext.sc_rdi = regs->tf_rdi;
633 sf.sf_sc.uc_mcontext.sc_rsi = regs->tf_rsi;
634 sf.sf_sc.uc_mcontext.sc_rdx = regs->tf_rdx;
635 sf.sf_sc.uc_mcontext.sc_rbp = regs->tf_rbp;
636 sf.sf_sc.uc_mcontext.sc_rbx = regs->tf_rbx;
637 sf.sf_sc.uc_mcontext.sc_rcx = regs->tf_rcx;
638 sf.sf_sc.uc_mcontext.sc_rax = regs->tf_rax;
639 sf.sf_sc.uc_mcontext.sc_rip = regs->tf_rip;
640 sf.sf_sc.uc_mcontext.sc_rsp = regs->tf_rsp;
641 sf.sf_sc.uc_mcontext.sc_r8 = regs->tf_r8;
642 sf.sf_sc.uc_mcontext.sc_r9 = regs->tf_r9;
643 sf.sf_sc.uc_mcontext.sc_r10 = regs->tf_r10;
644 sf.sf_sc.uc_mcontext.sc_r11 = regs->tf_r11;
645 sf.sf_sc.uc_mcontext.sc_r12 = regs->tf_r12;
646 sf.sf_sc.uc_mcontext.sc_r13 = regs->tf_r13;
647 sf.sf_sc.uc_mcontext.sc_r14 = regs->tf_r14;
648 sf.sf_sc.uc_mcontext.sc_r15 = regs->tf_r15;
649 sf.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
650 sf.sf_sc.uc_mcontext.sc_rflags = regs->tf_rflags;
651 sf.sf_sc.uc_mcontext.sc_err = regs->tf_err;
652 sf.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
653 sf.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr;
655 /* Build the argument list for the signal handler. */
656 regs->tf_rdi = sig; /* arg 1 in %rdi */
658 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
659 regs->tf_rdx = (register_t)&sfp->sf_sc; /* arg 3 in %rdx */
661 sf.sf_handler = catcher;
662 /* Fill in POSIX parts. */
663 ksiginfo_to_lsiginfo(ksi, &sf.sf_si, sig);
665 /* Copy the sigframe out to the user's stack. */
666 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
671 regs->tf_rsp = (long)sfp;
672 regs->tf_rip = linux_rt_sigcode;
673 regs->tf_rflags &= ~(PSL_T | PSL_D);
674 regs->tf_cs = _ucodesel;
675 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
677 mtx_lock(&psp->ps_mtx);
680 #define LINUX_VSYSCALL_START (-10UL << 20)
681 #define LINUX_VSYSCALL_SZ 1024
683 const unsigned long linux_vsyscall_vector[] = {
684 LINUX_SYS_gettimeofday,
685 LINUX_SYS_linux_time,
686 /* getcpu not implemented */
690 linux_vsyscall(struct thread *td)
692 struct trapframe *frame;
697 frame = td->td_frame;
699 /* Check %rip for vsyscall area. */
700 if (__predict_true(frame->tf_rip < LINUX_VSYSCALL_START))
702 if ((frame->tf_rip & (LINUX_VSYSCALL_SZ - 1)) != 0)
704 code = (frame->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SZ;
705 if (code >= nitems(linux_vsyscall_vector))
709 * vsyscall called as callq *(%rax), so we must
710 * use return address from %rsp and also fixup %rsp.
712 error = copyin((void *)frame->tf_rsp, &retqaddr, sizeof(retqaddr));
716 frame->tf_rip = retqaddr;
717 frame->tf_rax = linux_vsyscall_vector[code];
720 traced = (frame->tf_flags & PSL_T);
722 amd64_syscall(td, traced);
727 struct sysentvec elf_linux_sysvec = {
728 .sv_size = LINUX_SYS_MAXSYSCALL,
729 .sv_table = linux_sysent,
730 .sv_errsize = ELAST + 1,
731 .sv_errtbl = linux_errtbl,
732 .sv_transtrap = linux_translate_traps,
733 .sv_fixup = linux_fixup_elf,
734 .sv_sendsig = linux_rt_sendsig,
735 .sv_sigcode = &_binary_linux_locore_o_start,
736 .sv_szsigcode = &linux_szsigcode,
737 .sv_name = "Linux ELF64",
738 .sv_coredump = elf64_coredump,
739 .sv_imgact_try = linux_exec_imgact_try,
740 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
741 .sv_minuser = VM_MIN_ADDRESS,
742 .sv_maxuser = VM_MAXUSER_ADDRESS,
743 .sv_usrstack = USRSTACK,
744 .sv_psstrings = PS_STRINGS,
745 .sv_stackprot = VM_PROT_ALL,
746 .sv_copyout_auxargs = linux_copyout_auxargs,
747 .sv_copyout_strings = linux_copyout_strings,
748 .sv_setregs = linux_exec_setregs,
751 .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP,
752 .sv_set_syscall_retval = linux_set_syscall_retval,
753 .sv_fetch_syscall_args = linux_fetch_syscall_args,
754 .sv_syscallnames = NULL,
755 .sv_shared_page_base = SHAREDPAGE,
756 .sv_shared_page_len = PAGE_SIZE,
757 .sv_schedtail = linux_schedtail,
758 .sv_thread_detach = linux_thread_detach,
759 .sv_trap = linux_vsyscall,
763 linux_vdso_install(void *param)
766 amd64_lower_shared_page(&elf_linux_sysvec);
768 linux_szsigcode = (&_binary_linux_locore_o_end -
769 &_binary_linux_locore_o_start);
771 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
772 panic("Linux invalid vdso size\n");
774 __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
776 linux_shared_page_obj = __elfN(linux_shared_page_init)
777 (&linux_shared_page_mapping);
779 __elfN(linux_vdso_reloc)(&elf_linux_sysvec);
781 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
783 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
785 linux_kplatform = linux_shared_page_mapping +
786 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base);
788 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
789 linux_vdso_install, NULL);
792 linux_vdso_deinstall(void *param)
795 __elfN(linux_shared_page_fini)(linux_shared_page_obj);
797 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
798 linux_vdso_deinstall, NULL);
800 static char GNULINUX_ABI_VENDOR[] = "GNU";
801 static int GNULINUX_ABI_DESC = 0;
804 linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
806 const Elf32_Word *desc;
809 p = (uintptr_t)(note + 1);
810 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
812 desc = (const Elf32_Word *)p;
813 if (desc[0] != GNULINUX_ABI_DESC)
817 * For Linux we encode osrel using the Linux convention of
818 * (version << 16) | (major << 8) | (minor)
819 * See macro in linux_mib.h
821 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
826 static Elf_Brandnote linux64_brandnote = {
827 .hdr.n_namesz = sizeof(GNULINUX_ABI_VENDOR),
830 .vendor = GNULINUX_ABI_VENDOR,
831 .flags = BN_TRANSLATE_OSREL,
832 .trans_osrel = linux_trans_osrel
835 static Elf64_Brandinfo linux_glibc2brand = {
836 .brand = ELFOSABI_LINUX,
837 .machine = EM_X86_64,
838 .compat_3_brand = "Linux",
839 .emul_path = linux_emul_path,
840 .interp_path = "/lib64/ld-linux-x86-64.so.2",
841 .sysvec = &elf_linux_sysvec,
842 .interp_newpath = NULL,
843 .brand_note = &linux64_brandnote,
844 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
847 static Elf64_Brandinfo linux_glibc2brandshort = {
848 .brand = ELFOSABI_LINUX,
849 .machine = EM_X86_64,
850 .compat_3_brand = "Linux",
851 .emul_path = linux_emul_path,
852 .interp_path = "/lib64/ld-linux.so.2",
853 .sysvec = &elf_linux_sysvec,
854 .interp_newpath = NULL,
855 .brand_note = &linux64_brandnote,
856 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
859 static Elf64_Brandinfo linux_muslbrand = {
860 .brand = ELFOSABI_LINUX,
861 .machine = EM_X86_64,
862 .compat_3_brand = "Linux",
863 .emul_path = linux_emul_path,
864 .interp_path = "/lib/ld-musl-x86_64.so.1",
865 .sysvec = &elf_linux_sysvec,
866 .interp_newpath = NULL,
867 .brand_note = &linux64_brandnote,
868 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
871 Elf64_Brandinfo *linux_brandlist[] = {
873 &linux_glibc2brandshort,
879 linux64_elf_modevent(module_t mod, int type, void *data)
881 Elf64_Brandinfo **brandinfo;
883 struct linux_ioctl_handler **lihp;
889 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
891 if (elf64_insert_brand_entry(*brandinfo) < 0)
894 SET_FOREACH(lihp, linux_ioctl_handler_set)
895 linux_ioctl_register_handler(*lihp);
896 stclohz = (stathz ? stathz : hz);
898 printf("Linux x86-64 ELF exec handler installed\n");
900 printf("cannot insert Linux x86-64 ELF brand handler\n");
903 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
905 if (elf64_brand_inuse(*brandinfo))
908 for (brandinfo = &linux_brandlist[0];
909 *brandinfo != NULL; ++brandinfo)
910 if (elf64_remove_brand_entry(*brandinfo) < 0)
914 SET_FOREACH(lihp, linux_ioctl_handler_set)
915 linux_ioctl_unregister_handler(*lihp);
917 printf("Linux ELF exec handler removed\n");
919 printf("Could not deinstall ELF interpreter entry\n");
927 static moduledata_t linux64_elf_mod = {
929 linux64_elf_modevent,
933 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
934 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1);
935 FEATURE(linux64, "Linux 64bit support");