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 if (__predict_false(error != 0)) {
223 if (error != ERESTART && error != EJUSTRETURN)
224 frame->tf_rax = linux_to_bsd_errno(error);
227 /* Restore all registers. */
228 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
232 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
235 Elf_Auxinfo *argarray, *pos;
237 int error, issetugid;
240 args = (Elf64_Auxargs *)imgp->auxargs;
241 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
244 issetugid = p->p_flag & P_SUGID ? 1 : 0;
245 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
246 imgp->proc->p_sysent->sv_shared_page_base);
247 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
248 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
249 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
250 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
251 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
252 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
253 AUXARGS_ENTRY(pos, AT_BASE, args->base);
254 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
255 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
256 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
257 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
258 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
259 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
260 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
261 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
262 AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary);
263 if (imgp->execpathp != 0)
264 AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp);
265 if (args->execfd != -1)
266 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
267 AUXARGS_ENTRY(pos, AT_NULL, 0);
269 free(imgp->auxargs, M_TEMP);
270 imgp->auxargs = NULL;
271 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
273 error = copyout(argarray, (void *)base,
274 sizeof(*argarray) * LINUX_AT_COUNT);
275 free(argarray, M_TEMP);
280 linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp)
284 base = (Elf64_Addr *)*stack_base;
286 if (suword(base, (uint64_t)imgp->args->argc) == -1)
289 *stack_base = (uintptr_t)base;
294 * Copy strings out to the new process address space, constructing new arg
295 * and env vector tables. Return a pointer to the base so that it can be used
296 * as the initial stack pointer.
299 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
301 int argc, envc, error;
304 uintptr_t destp, ustringp;
305 struct ps_strings *arginfo;
306 char canary[LINUX_AT_RANDOM_LEN];
310 /* Calculate string base and vector table pointers. */
311 if (imgp->execpath != NULL && imgp->auxargs != NULL)
312 execpath_len = strlen(imgp->execpath) + 1;
317 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
318 destp = (uintptr_t)arginfo;
320 if (execpath_len != 0) {
321 destp -= execpath_len;
322 destp = rounddown2(destp, sizeof(void *));
323 imgp->execpathp = (void *)destp;
324 error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
329 /* Prepare the canary for SSP. */
330 arc4rand(canary, sizeof(canary), 0);
331 destp -= roundup(sizeof(canary), sizeof(void *));
332 imgp->canary = (void *)destp;
333 error = copyout(canary, imgp->canary, sizeof(canary));
337 /* Allocate room for the argument and environment strings. */
338 destp -= ARG_MAX - imgp->args->stringspace;
339 destp = rounddown2(destp, sizeof(void *));
344 * Allocate room on the stack for the ELF auxargs
345 * array. It has LINUX_AT_COUNT entries.
347 destp -= LINUX_AT_COUNT * sizeof(Elf64_Auxinfo);
348 destp = rounddown2(destp, sizeof(void *));
351 vectp = (char **)destp;
354 * Allocate room for the argv[] and env vectors including the
355 * terminating NULL pointers.
357 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
360 * Starting with 2.24, glibc depends on a 16-byte stack alignment.
361 * One "long argc" will be prepended later.
363 vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8);
365 /* vectp also becomes our initial stack base. */
366 *stack_base = (uintptr_t)vectp;
368 stringp = imgp->args->begin_argv;
369 argc = imgp->args->argc;
370 envc = imgp->args->envc;
372 /* Copy out strings - arguments and environment. */
373 error = copyout(stringp, (void *)ustringp,
374 ARG_MAX - imgp->args->stringspace);
378 /* Fill in "ps_strings" struct for ps, w, etc. */
379 if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 ||
380 suword(&arginfo->ps_nargvstr, argc) != 0)
383 /* Fill in argument portion of vector table. */
384 for (; argc > 0; --argc) {
385 if (suword(vectp++, ustringp) != 0)
387 while (*stringp++ != 0)
392 /* A null vector table pointer separates the argp's from the envp's. */
393 if (suword(vectp++, 0) != 0)
396 if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 ||
397 suword(&arginfo->ps_nenvstr, envc) != 0)
400 /* Fill in environment portion of vector table. */
401 for (; envc > 0; --envc) {
402 if (suword(vectp++, ustringp) != 0)
404 while (*stringp++ != 0)
409 /* The end of the vector table is a null pointer. */
410 if (suword(vectp, 0) != 0)
415 error = imgp->sysent->sv_copyout_auxargs(imgp,
425 * Reset registers to default values on exec.
428 linux_exec_setregs(struct thread *td, struct image_params *imgp,
431 struct trapframe *regs;
433 register_t saved_rflags;
438 if (td->td_proc->p_md.md_ldt != NULL)
443 clear_pcb_flags(pcb, PCB_32BIT);
444 pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
445 set_pcb_flags(pcb, PCB_FULL_IRET);
447 saved_rflags = regs->tf_rflags & PSL_T;
448 bzero((char *)regs, sizeof(struct trapframe));
449 regs->tf_rip = imgp->entry_addr;
450 regs->tf_rsp = stack;
451 regs->tf_rflags = PSL_USER | saved_rflags;
452 regs->tf_ss = _udatasel;
453 regs->tf_cs = _ucodesel;
454 regs->tf_ds = _udatasel;
455 regs->tf_es = _udatasel;
456 regs->tf_fs = _ufssel;
457 regs->tf_gs = _ugssel;
458 regs->tf_flags = TF_HASSEGS;
461 * Reset the hardware debug registers if they were in use.
462 * They won't have any meaning for the newly exec'd process.
464 if (pcb->pcb_flags & PCB_DBREGS) {
473 * Clear the debug registers on the running
474 * CPU, otherwise they will end up affecting
475 * the next process we switch to.
479 clear_pcb_flags(pcb, PCB_DBREGS);
483 * Drop the FP state if we hold it, so that the process gets a
484 * clean FP state if it uses the FPU again.
490 * Copied from amd64/amd64/machdep.c
492 * XXX fpu state need? don't think so
495 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
498 struct l_ucontext uc;
499 struct l_sigcontext *context;
500 struct trapframe *regs;
501 unsigned long rflags;
506 error = copyin((void *)regs->tf_rbx, &uc, sizeof(uc));
511 context = &uc.uc_mcontext;
512 rflags = context->sc_rflags;
515 * Don't allow users to change privileged or reserved flags.
518 * XXX do allow users to change the privileged flag PSL_RF.
519 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers
520 * should sometimes set it there too. tf_rflags is kept in
521 * the signal context during signal handling and there is no
522 * other place to remember it, so the PSL_RF bit may be
523 * corrupted by the signal handler without us knowing.
524 * Corruption of the PSL_RF bit at worst causes one more or
525 * one less debugger trap, so allowing it is fairly harmless.
528 #define RFLAG_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
529 if (!RFLAG_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
530 printf("linux_rt_sigreturn: rflags = 0x%lx\n", rflags);
535 * Don't allow users to load a valid privileged %cs. Let the
536 * hardware check for invalid selectors, excess privilege in
537 * other selectors, invalid %eip's and invalid %esp's.
539 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
540 if (!CS_SECURE(context->sc_cs)) {
541 printf("linux_rt_sigreturn: cs = 0x%x\n", context->sc_cs);
542 ksiginfo_init_trap(&ksi);
543 ksi.ksi_signo = SIGBUS;
544 ksi.ksi_code = BUS_OBJERR;
545 ksi.ksi_trapno = T_PROTFLT;
546 ksi.ksi_addr = (void *)regs->tf_rip;
547 trapsignal(td, &ksi);
552 linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask);
553 SIG_CANTMASK(td->td_sigmask);
557 regs->tf_rdi = context->sc_rdi;
558 regs->tf_rsi = context->sc_rsi;
559 regs->tf_rdx = context->sc_rdx;
560 regs->tf_rbp = context->sc_rbp;
561 regs->tf_rbx = context->sc_rbx;
562 regs->tf_rcx = context->sc_rcx;
563 regs->tf_rax = context->sc_rax;
564 regs->tf_rip = context->sc_rip;
565 regs->tf_rsp = context->sc_rsp;
566 regs->tf_r8 = context->sc_r8;
567 regs->tf_r9 = context->sc_r9;
568 regs->tf_r10 = context->sc_r10;
569 regs->tf_r11 = context->sc_r11;
570 regs->tf_r12 = context->sc_r12;
571 regs->tf_r13 = context->sc_r13;
572 regs->tf_r14 = context->sc_r14;
573 regs->tf_r15 = context->sc_r15;
574 regs->tf_cs = context->sc_cs;
575 regs->tf_err = context->sc_err;
576 regs->tf_rflags = rflags;
578 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
579 return (EJUSTRETURN);
583 * copied from amd64/amd64/machdep.c
585 * Send an interrupt to process.
588 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
590 struct l_rt_sigframe sf, *sfp;
595 struct trapframe *regs;
601 PROC_LOCK_ASSERT(p, MA_OWNED);
602 sig = ksi->ksi_signo;
604 code = ksi->ksi_code;
605 mtx_assert(&psp->ps_mtx, MA_OWNED);
607 oonstack = sigonstack(regs->tf_rsp);
609 LINUX_CTR4(rt_sendsig, "%p, %d, %p, %u",
610 catcher, sig, mask, code);
612 /* Allocate space for the signal handler context. */
613 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
614 SIGISMEMBER(psp->ps_sigonstack, sig)) {
615 sp = (caddr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size -
616 sizeof(struct l_rt_sigframe);
618 sp = (caddr_t)regs->tf_rsp - sizeof(struct l_rt_sigframe) - 128;
619 /* Align to 16 bytes. */
620 sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul);
621 mtx_unlock(&psp->ps_mtx);
623 /* Translate the signal. */
624 sig = bsd_to_linux_signal(sig);
626 /* Save user context. */
627 bzero(&sf, sizeof(sf));
628 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_sigmask);
629 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_mcontext.sc_mask);
631 sf.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
632 sf.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
633 sf.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
634 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
637 sf.sf_sc.uc_mcontext.sc_rdi = regs->tf_rdi;
638 sf.sf_sc.uc_mcontext.sc_rsi = regs->tf_rsi;
639 sf.sf_sc.uc_mcontext.sc_rdx = regs->tf_rdx;
640 sf.sf_sc.uc_mcontext.sc_rbp = regs->tf_rbp;
641 sf.sf_sc.uc_mcontext.sc_rbx = regs->tf_rbx;
642 sf.sf_sc.uc_mcontext.sc_rcx = regs->tf_rcx;
643 sf.sf_sc.uc_mcontext.sc_rax = regs->tf_rax;
644 sf.sf_sc.uc_mcontext.sc_rip = regs->tf_rip;
645 sf.sf_sc.uc_mcontext.sc_rsp = regs->tf_rsp;
646 sf.sf_sc.uc_mcontext.sc_r8 = regs->tf_r8;
647 sf.sf_sc.uc_mcontext.sc_r9 = regs->tf_r9;
648 sf.sf_sc.uc_mcontext.sc_r10 = regs->tf_r10;
649 sf.sf_sc.uc_mcontext.sc_r11 = regs->tf_r11;
650 sf.sf_sc.uc_mcontext.sc_r12 = regs->tf_r12;
651 sf.sf_sc.uc_mcontext.sc_r13 = regs->tf_r13;
652 sf.sf_sc.uc_mcontext.sc_r14 = regs->tf_r14;
653 sf.sf_sc.uc_mcontext.sc_r15 = regs->tf_r15;
654 sf.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
655 sf.sf_sc.uc_mcontext.sc_rflags = regs->tf_rflags;
656 sf.sf_sc.uc_mcontext.sc_err = regs->tf_err;
657 sf.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
658 sf.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr;
660 /* Build the argument list for the signal handler. */
661 regs->tf_rdi = sig; /* arg 1 in %rdi */
663 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
664 regs->tf_rdx = (register_t)&sfp->sf_sc; /* arg 3 in %rdx */
666 sf.sf_handler = catcher;
667 /* Fill in POSIX parts. */
668 ksiginfo_to_lsiginfo(ksi, &sf.sf_si, sig);
670 /* Copy the sigframe out to the user's stack. */
671 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
676 regs->tf_rsp = (long)sfp;
677 regs->tf_rip = linux_rt_sigcode;
678 regs->tf_rflags &= ~(PSL_T | PSL_D);
679 regs->tf_cs = _ucodesel;
680 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
682 mtx_lock(&psp->ps_mtx);
685 #define LINUX_VSYSCALL_START (-10UL << 20)
686 #define LINUX_VSYSCALL_SZ 1024
688 const unsigned long linux_vsyscall_vector[] = {
689 LINUX_SYS_gettimeofday,
690 LINUX_SYS_linux_time,
691 LINUX_SYS_linux_getcpu,
695 linux_vsyscall(struct thread *td)
697 struct trapframe *frame;
702 frame = td->td_frame;
704 /* Check %rip for vsyscall area. */
705 if (__predict_true(frame->tf_rip < LINUX_VSYSCALL_START))
707 if ((frame->tf_rip & (LINUX_VSYSCALL_SZ - 1)) != 0)
709 code = (frame->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SZ;
710 if (code >= nitems(linux_vsyscall_vector))
714 * vsyscall called as callq *(%rax), so we must
715 * use return address from %rsp and also fixup %rsp.
717 error = copyin((void *)frame->tf_rsp, &retqaddr, sizeof(retqaddr));
721 frame->tf_rip = retqaddr;
722 frame->tf_rax = linux_vsyscall_vector[code];
725 traced = (frame->tf_flags & PSL_T);
727 amd64_syscall(td, traced);
732 struct sysentvec elf_linux_sysvec = {
733 .sv_size = LINUX_SYS_MAXSYSCALL,
734 .sv_table = linux_sysent,
735 .sv_transtrap = linux_translate_traps,
736 .sv_fixup = linux_fixup_elf,
737 .sv_sendsig = linux_rt_sendsig,
738 .sv_sigcode = &_binary_linux_locore_o_start,
739 .sv_szsigcode = &linux_szsigcode,
740 .sv_name = "Linux ELF64",
741 .sv_coredump = elf64_coredump,
742 .sv_imgact_try = linux_exec_imgact_try,
743 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
744 .sv_minuser = VM_MIN_ADDRESS,
745 .sv_maxuser = VM_MAXUSER_ADDRESS_LA48,
746 .sv_usrstack = USRSTACK_LA48,
747 .sv_psstrings = PS_STRINGS_LA48,
748 .sv_stackprot = VM_PROT_ALL,
749 .sv_copyout_auxargs = linux_copyout_auxargs,
750 .sv_copyout_strings = linux_copyout_strings,
751 .sv_setregs = linux_exec_setregs,
754 .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP,
755 .sv_set_syscall_retval = linux_set_syscall_retval,
756 .sv_fetch_syscall_args = linux_fetch_syscall_args,
757 .sv_syscallnames = NULL,
758 .sv_shared_page_base = SHAREDPAGE_LA48,
759 .sv_shared_page_len = PAGE_SIZE,
760 .sv_schedtail = linux_schedtail,
761 .sv_thread_detach = linux_thread_detach,
762 .sv_trap = linux_vsyscall,
766 linux_vdso_install(void *param)
769 amd64_lower_shared_page(&elf_linux_sysvec);
771 linux_szsigcode = (&_binary_linux_locore_o_end -
772 &_binary_linux_locore_o_start);
774 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
775 panic("Linux invalid vdso size\n");
777 __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
779 linux_shared_page_obj = __elfN(linux_shared_page_init)
780 (&linux_shared_page_mapping);
782 __elfN(linux_vdso_reloc)(&elf_linux_sysvec);
784 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
786 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
788 linux_kplatform = linux_shared_page_mapping +
789 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base);
791 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
792 linux_vdso_install, NULL);
795 linux_vdso_deinstall(void *param)
798 __elfN(linux_shared_page_fini)(linux_shared_page_obj);
800 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
801 linux_vdso_deinstall, NULL);
803 static char GNULINUX_ABI_VENDOR[] = "GNU";
804 static int GNULINUX_ABI_DESC = 0;
807 linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
809 const Elf32_Word *desc;
812 p = (uintptr_t)(note + 1);
813 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
815 desc = (const Elf32_Word *)p;
816 if (desc[0] != GNULINUX_ABI_DESC)
820 * For Linux we encode osrel using the Linux convention of
821 * (version << 16) | (major << 8) | (minor)
822 * See macro in linux_mib.h
824 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
829 static Elf_Brandnote linux64_brandnote = {
830 .hdr.n_namesz = sizeof(GNULINUX_ABI_VENDOR),
833 .vendor = GNULINUX_ABI_VENDOR,
834 .flags = BN_TRANSLATE_OSREL,
835 .trans_osrel = linux_trans_osrel
838 static Elf64_Brandinfo linux_glibc2brand = {
839 .brand = ELFOSABI_LINUX,
840 .machine = EM_X86_64,
841 .compat_3_brand = "Linux",
842 .emul_path = linux_emul_path,
843 .interp_path = "/lib64/ld-linux-x86-64.so.2",
844 .sysvec = &elf_linux_sysvec,
845 .interp_newpath = NULL,
846 .brand_note = &linux64_brandnote,
847 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
850 static Elf64_Brandinfo linux_glibc2brandshort = {
851 .brand = ELFOSABI_LINUX,
852 .machine = EM_X86_64,
853 .compat_3_brand = "Linux",
854 .emul_path = linux_emul_path,
855 .interp_path = "/lib64/ld-linux.so.2",
856 .sysvec = &elf_linux_sysvec,
857 .interp_newpath = NULL,
858 .brand_note = &linux64_brandnote,
859 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
862 static Elf64_Brandinfo linux_muslbrand = {
863 .brand = ELFOSABI_LINUX,
864 .machine = EM_X86_64,
865 .compat_3_brand = "Linux",
866 .emul_path = linux_emul_path,
867 .interp_path = "/lib/ld-musl-x86_64.so.1",
868 .sysvec = &elf_linux_sysvec,
869 .interp_newpath = NULL,
870 .brand_note = &linux64_brandnote,
871 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
874 Elf64_Brandinfo *linux_brandlist[] = {
876 &linux_glibc2brandshort,
882 linux64_elf_modevent(module_t mod, int type, void *data)
884 Elf64_Brandinfo **brandinfo;
886 struct linux_ioctl_handler **lihp;
892 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
894 if (elf64_insert_brand_entry(*brandinfo) < 0)
897 SET_FOREACH(lihp, linux_ioctl_handler_set)
898 linux_ioctl_register_handler(*lihp);
899 stclohz = (stathz ? stathz : hz);
901 printf("Linux x86-64 ELF exec handler installed\n");
903 printf("cannot insert Linux x86-64 ELF brand handler\n");
906 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
908 if (elf64_brand_inuse(*brandinfo))
911 for (brandinfo = &linux_brandlist[0];
912 *brandinfo != NULL; ++brandinfo)
913 if (elf64_remove_brand_entry(*brandinfo) < 0)
917 SET_FOREACH(lihp, linux_ioctl_handler_set)
918 linux_ioctl_unregister_handler(*lihp);
920 printf("Linux ELF exec handler removed\n");
922 printf("Could not deinstall ELF interpreter entry\n");
930 static moduledata_t linux64_elf_mod = {
932 linux64_elf_modevent,
936 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
937 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1);
938 FEATURE(linux64, "Linux 64bit support");