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 #include "opt_compat.h"
39 #define __ELF_WORD_SIZE 64
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/fcntl.h>
45 #include <sys/imgact.h>
46 #include <sys/imgact_elf.h>
47 #include <sys/kernel.h>
50 #include <sys/malloc.h>
51 #include <sys/module.h>
52 #include <sys/mutex.h>
54 #include <sys/resourcevar.h>
55 #include <sys/signalvar.h>
56 #include <sys/sysctl.h>
57 #include <sys/syscallsubr.h>
58 #include <sys/sysent.h>
59 #include <sys/sysproto.h>
60 #include <sys/vnode.h>
61 #include <sys/eventhandler.h>
65 #include <vm/vm_extern.h>
66 #include <vm/vm_map.h>
67 #include <vm/vm_object.h>
68 #include <vm/vm_page.h>
69 #include <vm/vm_param.h>
71 #include <machine/cpu.h>
72 #include <machine/md_var.h>
73 #include <machine/pcb.h>
74 #include <machine/specialreg.h>
76 #include <amd64/linux/linux.h>
77 #include <amd64/linux/linux_proto.h>
78 #include <compat/linux/linux_emul.h>
79 #include <compat/linux/linux_futex.h>
80 #include <compat/linux/linux_ioctl.h>
81 #include <compat/linux/linux_mib.h>
82 #include <compat/linux/linux_misc.h>
83 #include <compat/linux/linux_signal.h>
84 #include <compat/linux/linux_sysproto.h>
85 #include <compat/linux/linux_util.h>
86 #include <compat/linux/linux_vdso.h>
88 MODULE_VERSION(linux64, 1);
90 #if BYTE_ORDER == LITTLE_ENDIAN
91 #define SHELLMAGIC 0x2123 /* #! */
93 #define SHELLMAGIC 0x2321
97 SYSCTL_PROC(_compat_linux, OID_AUTO, debug,
98 CTLTYPE_STRING | CTLFLAG_RW,
99 0, 0, linux_sysctl_debug, "A",
100 "Linux 64 debugging control");
104 * Allow the this functions to use the ldebug() facility
105 * even though they are not syscalls themselves. Map them
106 * to syscall 0. This is slightly less bogus than using
109 #define LINUX_SYS_linux_rt_sendsig 0
111 const char *linux_kplatform;
112 static int linux_szsigcode;
113 static vm_object_t linux_shared_page_obj;
114 static char *linux_shared_page_mapping;
115 extern char _binary_linux_locore_o_start;
116 extern char _binary_linux_locore_o_end;
118 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
120 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
122 static register_t * linux_copyout_strings(struct image_params *imgp);
123 static int elf_linux_fixup(register_t **stack_base,
124 struct image_params *iparams);
125 static boolean_t linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
126 static void linux_vdso_install(void *param);
127 static void linux_vdso_deinstall(void *param);
128 static void linux_set_syscall_retval(struct thread *td, int error);
129 static int linux_fetch_syscall_args(struct thread *td);
130 static void linux_exec_setregs(struct thread *td, struct image_params *imgp,
132 static int linux_vsyscall(struct thread *td);
135 * Linux syscalls return negative errno's, we do positive and map them
137 * FreeBSD: src/sys/sys/errno.h
138 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h
139 * linux-2.6.17.8/include/asm-generic/errno.h
141 static int bsd_to_linux_errno[ELAST + 1] = {
142 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9,
143 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
144 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
145 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
146 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
147 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
148 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
149 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9,
150 -6, -6, -43, -42, -75,-125, -84, -61, -16, -74,
154 #define LINUX_T_UNKNOWN 255
155 static int _bsd_to_linux_trapcode[] = {
156 LINUX_T_UNKNOWN, /* 0 */
157 6, /* 1 T_PRIVINFLT */
158 LINUX_T_UNKNOWN, /* 2 */
160 LINUX_T_UNKNOWN, /* 4 */
161 LINUX_T_UNKNOWN, /* 5 */
162 16, /* 6 T_ARITHTRAP */
163 254, /* 7 T_ASTFLT */
164 LINUX_T_UNKNOWN, /* 8 */
165 13, /* 9 T_PROTFLT */
166 1, /* 10 T_TRCTRAP */
167 LINUX_T_UNKNOWN, /* 11 */
168 14, /* 12 T_PAGEFLT */
169 LINUX_T_UNKNOWN, /* 13 */
170 17, /* 14 T_ALIGNFLT */
171 LINUX_T_UNKNOWN, /* 15 */
172 LINUX_T_UNKNOWN, /* 16 */
173 LINUX_T_UNKNOWN, /* 17 */
179 8, /* 23 T_DOUBLEFLT */
180 9, /* 24 T_FPOPFLT */
181 10, /* 25 T_TSSFLT */
182 11, /* 26 T_SEGNPFLT */
183 12, /* 27 T_STKFLT */
185 19, /* 29 T_XMMFLT */
186 15 /* 30 T_RESERVED */
188 #define bsd_to_linux_trapcode(code) \
189 ((code)<nitems(_bsd_to_linux_trapcode)? \
190 _bsd_to_linux_trapcode[(code)]: \
193 LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode);
194 LINUX_VDSO_SYM_CHAR(linux_platform);
197 * If FreeBSD & Linux have a difference of opinion about what a trap
198 * means, deal with it here.
203 translate_traps(int signal, int trap_code)
206 if (signal != SIGBUS)
220 linux_fetch_syscall_args(struct thread *td)
223 struct trapframe *frame;
224 struct syscall_args *sa;
227 frame = td->td_frame;
230 sa->args[0] = frame->tf_rdi;
231 sa->args[1] = frame->tf_rsi;
232 sa->args[2] = frame->tf_rdx;
233 sa->args[3] = frame->tf_rcx;
234 sa->args[4] = frame->tf_r8;
235 sa->args[5] = frame->tf_r9;
236 sa->code = frame->tf_rax;
238 if (sa->code >= p->p_sysent->sv_size)
240 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
242 sa->callp = &p->p_sysent->sv_table[sa->code];
243 sa->narg = sa->callp->sy_narg;
245 td->td_retval[0] = 0;
250 linux_set_syscall_retval(struct thread *td, int error)
252 struct trapframe *frame = td->td_frame;
255 * On Linux only %rcx and %r11 values are not preserved across
257 * So, do not clobber %rdx and %r10
259 td->td_retval[1] = frame->tf_rdx;
260 frame->tf_r10 = frame->tf_rcx;
262 cpu_set_syscall_retval(td, error);
264 /* Restore all registers. */
265 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
269 elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
274 struct ps_strings *arginfo;
279 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
281 KASSERT(curthread->td_proc == imgp->proc,
282 ("unsafe elf_linux_fixup(), should be curproc"));
283 base = (Elf64_Addr *)*stack_base;
284 args = (Elf64_Auxargs *)imgp->auxargs;
285 pos = base + (imgp->args->argc + imgp->args->envc + 2);
287 issetugid = p->p_flag & P_SUGID ? 1 : 0;
288 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
289 imgp->proc->p_sysent->sv_shared_page_base);
290 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
291 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
292 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
293 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
294 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
295 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
296 AUXARGS_ENTRY(pos, AT_BASE, args->base);
297 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
298 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
299 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
300 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
301 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
302 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
303 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
304 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
305 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary);
306 if (imgp->execpathp != 0)
307 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp);
308 if (args->execfd != -1)
309 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
310 AUXARGS_ENTRY(pos, AT_NULL, 0);
311 free(imgp->auxargs, M_TEMP);
312 imgp->auxargs = NULL;
315 suword(base, (uint64_t)imgp->args->argc);
317 *stack_base = (register_t *)base;
322 * Copy strings out to the new process address space, constructing new arg
323 * and env vector tables. Return a pointer to the base so that it can be used
324 * as the initial stack pointer.
327 linux_copyout_strings(struct image_params *imgp)
331 char *stringp, *destp;
332 register_t *stack_base;
333 struct ps_strings *arginfo;
334 char canary[LINUX_AT_RANDOM_LEN];
339 * Calculate string base and vector table pointers.
341 if (imgp->execpath != NULL && imgp->auxargs != NULL)
342 execpath_len = strlen(imgp->execpath) + 1;
347 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
348 destp = (caddr_t)arginfo - SPARE_USRSPACE -
349 roundup(sizeof(canary), sizeof(char *)) -
350 roundup(execpath_len, sizeof(char *)) -
351 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));
353 if (execpath_len != 0) {
354 imgp->execpathp = (uintptr_t)arginfo - execpath_len;
355 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len);
359 * Prepare the canary for SSP.
361 arc4rand(canary, sizeof(canary), 0);
362 imgp->canary = (uintptr_t)arginfo -
363 roundup(execpath_len, sizeof(char *)) -
364 roundup(sizeof(canary), sizeof(char *));
365 copyout(canary, (void *)imgp->canary, sizeof(canary));
368 * If we have a valid auxargs ptr, prepare some room
373 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
374 * lower compatibility.
376 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size :
377 (LINUX_AT_COUNT * 2);
380 * The '+ 2' is for the null pointers at the end of each of
381 * the arg and env vector sets,and imgp->auxarg_size is room
382 * for argument of Runtime loader.
384 vectp = (char **)(destp - (imgp->args->argc +
385 imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *));
389 * The '+ 2' is for the null pointers at the end of each of
390 * the arg and env vector sets
392 vectp = (char **)(destp - (imgp->args->argc +
393 imgp->args->envc + 2) * sizeof(char *));
397 * vectp also becomes our initial stack base
399 stack_base = (register_t *)vectp;
401 stringp = imgp->args->begin_argv;
402 argc = imgp->args->argc;
403 envc = imgp->args->envc;
406 * Copy out strings - arguments and environment.
408 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
411 * Fill in "ps_strings" struct for ps, w, etc.
413 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp);
414 suword(&arginfo->ps_nargvstr, argc);
417 * Fill in argument portion of vector table.
419 for (; argc > 0; --argc) {
420 suword(vectp++, (long)(intptr_t)destp);
421 while (*stringp++ != 0)
426 /* a null vector table pointer separates the argp's from the envp's */
429 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp);
430 suword(&arginfo->ps_nenvstr, envc);
433 * Fill in environment portion of vector table.
435 for (; envc > 0; --envc) {
436 suword(vectp++, (long)(intptr_t)destp);
437 while (*stringp++ != 0)
442 /* end of vector table is a null pointer */
448 * Reset registers to default values on exec.
451 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
453 struct trapframe *regs = td->td_frame;
454 struct pcb *pcb = td->td_pcb;
456 if (td->td_proc->p_md.md_ldt != NULL)
461 clear_pcb_flags(pcb, PCB_32BIT);
462 pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
463 set_pcb_flags(pcb, PCB_FULL_IRET);
465 bzero((char *)regs, sizeof(struct trapframe));
466 regs->tf_rip = imgp->entry_addr;
467 regs->tf_rsp = stack;
468 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
469 regs->tf_ss = _udatasel;
470 regs->tf_cs = _ucodesel;
471 regs->tf_ds = _udatasel;
472 regs->tf_es = _udatasel;
473 regs->tf_fs = _ufssel;
474 regs->tf_gs = _ugssel;
475 regs->tf_flags = TF_HASSEGS;
478 * Reset the hardware debug registers if they were in use.
479 * They won't have any meaning for the newly exec'd process.
481 if (pcb->pcb_flags & PCB_DBREGS) {
490 * Clear the debug registers on the running
491 * CPU, otherwise they will end up affecting
492 * the next process we switch to.
496 clear_pcb_flags(pcb, PCB_DBREGS);
500 * Drop the FP state if we hold it, so that the process gets a
501 * clean FP state if it uses the FPU again.
507 * Copied from amd64/amd64/machdep.c
509 * XXX fpu state need? don't think so
512 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
515 struct l_ucontext uc;
516 struct l_sigcontext *context;
517 struct trapframe *regs;
518 unsigned long rflags;
523 error = copyin((void *)regs->tf_rbx, &uc, sizeof(uc));
528 context = &uc.uc_mcontext;
529 rflags = context->sc_rflags;
532 * Don't allow users to change privileged or reserved flags.
535 * XXX do allow users to change the privileged flag PSL_RF.
536 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers
537 * should sometimes set it there too. tf_rflags is kept in
538 * the signal context during signal handling and there is no
539 * other place to remember it, so the PSL_RF bit may be
540 * corrupted by the signal handler without us knowing.
541 * Corruption of the PSL_RF bit at worst causes one more or
542 * one less debugger trap, so allowing it is fairly harmless.
545 #define RFLAG_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
546 if (!RFLAG_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
547 printf("linux_rt_sigreturn: rflags = 0x%lx\n", rflags);
552 * Don't allow users to load a valid privileged %cs. Let the
553 * hardware check for invalid selectors, excess privilege in
554 * other selectors, invalid %eip's and invalid %esp's.
556 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
557 if (!CS_SECURE(context->sc_cs)) {
558 printf("linux_rt_sigreturn: cs = 0x%x\n", context->sc_cs);
559 ksiginfo_init_trap(&ksi);
560 ksi.ksi_signo = SIGBUS;
561 ksi.ksi_code = BUS_OBJERR;
562 ksi.ksi_trapno = T_PROTFLT;
563 ksi.ksi_addr = (void *)regs->tf_rip;
564 trapsignal(td, &ksi);
569 linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask);
570 SIG_CANTMASK(td->td_sigmask);
574 regs->tf_rdi = context->sc_rdi;
575 regs->tf_rsi = context->sc_rsi;
576 regs->tf_rdx = context->sc_rdx;
577 regs->tf_rbp = context->sc_rbp;
578 regs->tf_rbx = context->sc_rbx;
579 regs->tf_rcx = context->sc_rcx;
580 regs->tf_rax = context->sc_rax;
581 regs->tf_rip = context->sc_rip;
582 regs->tf_rsp = context->sc_rsp;
583 regs->tf_r8 = context->sc_r8;
584 regs->tf_r9 = context->sc_r9;
585 regs->tf_r10 = context->sc_r10;
586 regs->tf_r11 = context->sc_r11;
587 regs->tf_r12 = context->sc_r12;
588 regs->tf_r13 = context->sc_r13;
589 regs->tf_r14 = context->sc_r14;
590 regs->tf_r15 = context->sc_r15;
591 regs->tf_cs = context->sc_cs;
592 regs->tf_err = context->sc_err;
593 regs->tf_rflags = rflags;
595 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
596 return (EJUSTRETURN);
600 * copied from amd64/amd64/machdep.c
602 * Send an interrupt to process.
605 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
607 struct l_rt_sigframe sf, *sfp;
612 struct trapframe *regs;
618 PROC_LOCK_ASSERT(p, MA_OWNED);
619 sig = ksi->ksi_signo;
621 code = ksi->ksi_code;
622 mtx_assert(&psp->ps_mtx, MA_OWNED);
624 oonstack = sigonstack(regs->tf_rsp);
626 LINUX_CTR4(rt_sendsig, "%p, %d, %p, %u",
627 catcher, sig, mask, code);
629 /* Allocate space for the signal handler context. */
630 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
631 SIGISMEMBER(psp->ps_sigonstack, sig)) {
632 sp = (caddr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size -
633 sizeof(struct l_rt_sigframe);
635 sp = (caddr_t)regs->tf_rsp - sizeof(struct l_rt_sigframe) - 128;
636 /* Align to 16 bytes. */
637 sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul);
638 mtx_unlock(&psp->ps_mtx);
640 /* Translate the signal. */
641 sig = bsd_to_linux_signal(sig);
643 /* Save user context. */
644 bzero(&sf, sizeof(sf));
645 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_sigmask);
646 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_mcontext.sc_mask);
648 sf.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
649 sf.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
650 sf.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
651 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
654 sf.sf_sc.uc_mcontext.sc_rdi = regs->tf_rdi;
655 sf.sf_sc.uc_mcontext.sc_rsi = regs->tf_rsi;
656 sf.sf_sc.uc_mcontext.sc_rdx = regs->tf_rdx;
657 sf.sf_sc.uc_mcontext.sc_rbp = regs->tf_rbp;
658 sf.sf_sc.uc_mcontext.sc_rbx = regs->tf_rbx;
659 sf.sf_sc.uc_mcontext.sc_rcx = regs->tf_rcx;
660 sf.sf_sc.uc_mcontext.sc_rax = regs->tf_rax;
661 sf.sf_sc.uc_mcontext.sc_rip = regs->tf_rip;
662 sf.sf_sc.uc_mcontext.sc_rsp = regs->tf_rsp;
663 sf.sf_sc.uc_mcontext.sc_r8 = regs->tf_r8;
664 sf.sf_sc.uc_mcontext.sc_r9 = regs->tf_r9;
665 sf.sf_sc.uc_mcontext.sc_r10 = regs->tf_r10;
666 sf.sf_sc.uc_mcontext.sc_r11 = regs->tf_r11;
667 sf.sf_sc.uc_mcontext.sc_r12 = regs->tf_r12;
668 sf.sf_sc.uc_mcontext.sc_r13 = regs->tf_r13;
669 sf.sf_sc.uc_mcontext.sc_r14 = regs->tf_r14;
670 sf.sf_sc.uc_mcontext.sc_r15 = regs->tf_r15;
671 sf.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
672 sf.sf_sc.uc_mcontext.sc_rflags = regs->tf_rflags;
673 sf.sf_sc.uc_mcontext.sc_err = regs->tf_err;
674 sf.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
675 sf.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr;
677 /* Build the argument list for the signal handler. */
678 regs->tf_rdi = sig; /* arg 1 in %rdi */
680 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
681 regs->tf_rdx = (register_t)&sfp->sf_sc; /* arg 3 in %rdx */
683 sf.sf_handler = catcher;
684 /* Fill in POSIX parts */
685 ksiginfo_to_lsiginfo(ksi, &sf.sf_si, sig);
688 * Copy the sigframe out to the user's stack.
690 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
692 printf("process %ld has trashed its stack\n", (long)p->p_pid);
698 regs->tf_rsp = (long)sfp;
699 regs->tf_rip = linux_rt_sigcode;
700 regs->tf_rflags &= ~(PSL_T | PSL_D);
701 regs->tf_cs = _ucodesel;
702 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
704 mtx_lock(&psp->ps_mtx);
708 * If a linux binary is exec'ing something, try this image activator
709 * first. We override standard shell script execution in order to
710 * be able to modify the interpreter path. We only do this if a linux
711 * binary is doing the exec, so we do not create an EXEC module for it.
713 static int exec_linux_imgact_try(struct image_params *iparams);
716 exec_linux_imgact_try(struct image_params *imgp)
718 const char *head = (const char *)imgp->image_header;
723 * The interpreter for shell scripts run from a linux binary needs
724 * to be located in /compat/linux if possible in order to recursively
725 * maintain linux path emulation.
727 if (((const short *)head)[0] == SHELLMAGIC) {
729 * Run our normal shell image activator. If it succeeds
730 * attempt to use the alternate path for the interpreter.
731 * If an alternate path is found, use our stringspace
734 if ((error = exec_shell_imgact(imgp)) == 0) {
735 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc),
736 imgp->interpreter_name, UIO_SYSSPACE,
737 &rpath, 0, AT_FDCWD);
739 imgp->args->fname_buf =
740 imgp->interpreter_name = rpath;
746 #define LINUX_VSYSCALL_START (-10UL << 20)
747 #define LINUX_VSYSCALL_SZ 1024
749 const unsigned long linux_vsyscall_vector[] = {
750 LINUX_SYS_gettimeofday,
751 LINUX_SYS_linux_time,
752 /* getcpu not implemented */
756 linux_vsyscall(struct thread *td)
758 struct trapframe *frame;
763 frame = td->td_frame;
765 /* Check %rip for vsyscall area */
766 if (__predict_true(frame->tf_rip < LINUX_VSYSCALL_START))
768 if ((frame->tf_rip & (LINUX_VSYSCALL_SZ - 1)) != 0)
770 code = (frame->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SZ;
771 if (code >= nitems(linux_vsyscall_vector))
775 * vsyscall called as callq *(%rax), so we must
776 * use return address from %rsp and also fixup %rsp
778 error = copyin((void *)frame->tf_rsp, &retqaddr, sizeof(retqaddr));
782 frame->tf_rip = retqaddr;
783 frame->tf_rax = linux_vsyscall_vector[code];
786 traced = (frame->tf_flags & PSL_T);
788 amd64_syscall(td, traced);
793 struct sysentvec elf_linux_sysvec = {
794 .sv_size = LINUX_SYS_MAXSYSCALL,
795 .sv_table = linux_sysent,
797 .sv_errsize = ELAST + 1,
798 .sv_errtbl = bsd_to_linux_errno,
799 .sv_transtrap = translate_traps,
800 .sv_fixup = elf_linux_fixup,
801 .sv_sendsig = linux_rt_sendsig,
802 .sv_sigcode = &_binary_linux_locore_o_start,
803 .sv_szsigcode = &linux_szsigcode,
804 .sv_name = "Linux ELF64",
805 .sv_coredump = elf64_coredump,
806 .sv_imgact_try = exec_linux_imgact_try,
807 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
808 .sv_pagesize = PAGE_SIZE,
809 .sv_minuser = VM_MIN_ADDRESS,
810 .sv_maxuser = VM_MAXUSER_ADDRESS,
811 .sv_usrstack = USRSTACK,
812 .sv_psstrings = PS_STRINGS,
813 .sv_stackprot = VM_PROT_ALL,
814 .sv_copyout_strings = linux_copyout_strings,
815 .sv_setregs = linux_exec_setregs,
818 .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP,
819 .sv_set_syscall_retval = linux_set_syscall_retval,
820 .sv_fetch_syscall_args = linux_fetch_syscall_args,
821 .sv_syscallnames = NULL,
822 .sv_shared_page_base = SHAREDPAGE,
823 .sv_shared_page_len = PAGE_SIZE,
824 .sv_schedtail = linux_schedtail,
825 .sv_thread_detach = linux_thread_detach,
826 .sv_trap = linux_vsyscall,
830 linux_vdso_install(void *param)
833 amd64_lower_shared_page(&elf_linux_sysvec);
835 linux_szsigcode = (&_binary_linux_locore_o_end -
836 &_binary_linux_locore_o_start);
838 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
839 panic("Linux invalid vdso size\n");
841 __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
843 linux_shared_page_obj = __elfN(linux_shared_page_init)
844 (&linux_shared_page_mapping);
846 __elfN(linux_vdso_reloc)(&elf_linux_sysvec);
848 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
850 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
852 linux_kplatform = linux_shared_page_mapping +
853 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base);
855 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
856 (sysinit_cfunc_t)linux_vdso_install, NULL);
859 linux_vdso_deinstall(void *param)
862 __elfN(linux_shared_page_fini)(linux_shared_page_obj);
864 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
865 (sysinit_cfunc_t)linux_vdso_deinstall, NULL);
867 static char GNULINUX_ABI_VENDOR[] = "GNU";
868 static int GNULINUX_ABI_DESC = 0;
871 linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
873 const Elf32_Word *desc;
876 p = (uintptr_t)(note + 1);
877 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
879 desc = (const Elf32_Word *)p;
880 if (desc[0] != GNULINUX_ABI_DESC)
884 * For linux we encode osrel as follows (see linux_mib.c):
885 * VVVMMMIII (version, major, minor), see linux_mib.c.
887 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3];
892 static Elf_Brandnote linux64_brandnote = {
893 .hdr.n_namesz = sizeof(GNULINUX_ABI_VENDOR),
896 .vendor = GNULINUX_ABI_VENDOR,
897 .flags = BN_TRANSLATE_OSREL,
898 .trans_osrel = linux_trans_osrel
901 static Elf64_Brandinfo linux_glibc2brand = {
902 .brand = ELFOSABI_LINUX,
903 .machine = EM_X86_64,
904 .compat_3_brand = "Linux",
905 .emul_path = "/compat/linux",
906 .interp_path = "/lib64/ld-linux-x86-64.so.2",
907 .sysvec = &elf_linux_sysvec,
908 .interp_newpath = NULL,
909 .brand_note = &linux64_brandnote,
910 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
913 static Elf64_Brandinfo linux_glibc2brandshort = {
914 .brand = ELFOSABI_LINUX,
915 .machine = EM_X86_64,
916 .compat_3_brand = "Linux",
917 .emul_path = "/compat/linux",
918 .interp_path = "/lib64/ld-linux.so.2",
919 .sysvec = &elf_linux_sysvec,
920 .interp_newpath = NULL,
921 .brand_note = &linux64_brandnote,
922 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
925 static Elf64_Brandinfo linux_muslbrand = {
926 .brand = ELFOSABI_LINUX,
927 .machine = EM_X86_64,
928 .compat_3_brand = "Linux",
929 .emul_path = "/compat/linux",
930 .interp_path = "/lib/ld-musl-x86_64.so.1",
931 .sysvec = &elf_linux_sysvec,
932 .interp_newpath = NULL,
933 .brand_note = &linux64_brandnote,
934 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
937 Elf64_Brandinfo *linux_brandlist[] = {
939 &linux_glibc2brandshort,
945 linux64_elf_modevent(module_t mod, int type, void *data)
947 Elf64_Brandinfo **brandinfo;
949 struct linux_ioctl_handler **lihp;
955 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
957 if (elf64_insert_brand_entry(*brandinfo) < 0)
960 SET_FOREACH(lihp, linux_ioctl_handler_set)
961 linux_ioctl_register_handler(*lihp);
962 LIST_INIT(&futex_list);
963 mtx_init(&futex_mtx, "ftllk64", NULL, MTX_DEF);
964 stclohz = (stathz ? stathz : hz);
966 printf("Linux x86-64 ELF exec handler installed\n");
968 printf("cannot insert Linux x86-64 ELF brand handler\n");
971 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
973 if (elf64_brand_inuse(*brandinfo))
976 for (brandinfo = &linux_brandlist[0];
977 *brandinfo != NULL; ++brandinfo)
978 if (elf64_remove_brand_entry(*brandinfo) < 0)
982 SET_FOREACH(lihp, linux_ioctl_handler_set)
983 linux_ioctl_unregister_handler(*lihp);
984 mtx_destroy(&futex_mtx);
986 printf("Linux ELF exec handler removed\n");
988 printf("Could not deinstall ELF interpreter entry\n");
996 static moduledata_t linux64_elf_mod = {
998 linux64_elf_modevent,
1002 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
1003 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1);
1004 FEATURE(linux64, "Linux 64bit support");