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, struct syscall_args *sa);
130 static void linux_exec_setregs(struct thread *td, struct image_params *imgp,
134 * Linux syscalls return negative errno's, we do positive and map them
136 * FreeBSD: src/sys/sys/errno.h
137 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h
138 * linux-2.6.17.8/include/asm-generic/errno.h
140 static int bsd_to_linux_errno[ELAST + 1] = {
141 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9,
142 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
143 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
144 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
145 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
146 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
147 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
148 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9,
149 -6, -6, -43, -42, -75,-125, -84, -95, -16, -74,
153 #define LINUX_T_UNKNOWN 255
154 static int _bsd_to_linux_trapcode[] = {
155 LINUX_T_UNKNOWN, /* 0 */
156 6, /* 1 T_PRIVINFLT */
157 LINUX_T_UNKNOWN, /* 2 */
159 LINUX_T_UNKNOWN, /* 4 */
160 LINUX_T_UNKNOWN, /* 5 */
161 16, /* 6 T_ARITHTRAP */
162 254, /* 7 T_ASTFLT */
163 LINUX_T_UNKNOWN, /* 8 */
164 13, /* 9 T_PROTFLT */
165 1, /* 10 T_TRCTRAP */
166 LINUX_T_UNKNOWN, /* 11 */
167 14, /* 12 T_PAGEFLT */
168 LINUX_T_UNKNOWN, /* 13 */
169 17, /* 14 T_ALIGNFLT */
170 LINUX_T_UNKNOWN, /* 15 */
171 LINUX_T_UNKNOWN, /* 16 */
172 LINUX_T_UNKNOWN, /* 17 */
178 8, /* 23 T_DOUBLEFLT */
179 9, /* 24 T_FPOPFLT */
180 10, /* 25 T_TSSFLT */
181 11, /* 26 T_SEGNPFLT */
182 12, /* 27 T_STKFLT */
184 19, /* 29 T_XMMFLT */
185 15 /* 30 T_RESERVED */
187 #define bsd_to_linux_trapcode(code) \
188 ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \
189 _bsd_to_linux_trapcode[(code)]: \
192 LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode);
193 LINUX_VDSO_SYM_CHAR(linux_platform);
196 * If FreeBSD & Linux have a difference of opinion about what a trap
197 * means, deal with it here.
202 translate_traps(int signal, int trap_code)
205 if (signal != SIGBUS)
219 linux_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
222 struct trapframe *frame;
225 frame = td->td_frame;
227 sa->args[0] = frame->tf_rdi;
228 sa->args[1] = frame->tf_rsi;
229 sa->args[2] = frame->tf_rdx;
230 sa->args[3] = frame->tf_rcx;
231 sa->args[4] = frame->tf_r8;
232 sa->args[5] = frame->tf_r9;
233 sa->code = frame->tf_rax;
235 if (sa->code >= p->p_sysent->sv_size)
237 sa->callp = &p->p_sysent->sv_table[LINUX_SYS_MAXSYSCALL];
239 sa->callp = &p->p_sysent->sv_table[sa->code];
240 sa->narg = sa->callp->sy_narg;
242 td->td_retval[0] = 0;
247 linux_set_syscall_retval(struct thread *td, int error)
249 struct trapframe *frame = td->td_frame;
252 * On Linux only %rcx and %r11 values are not preserved across
254 * So, do not clobber %rdx and %r10
256 td->td_retval[1] = frame->tf_rdx;
257 frame->tf_r10 = frame->tf_rcx;
259 cpu_set_syscall_retval(td, error);
261 /* Restore all registers. */
262 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
266 elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
271 struct ps_strings *arginfo;
275 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
277 KASSERT(curthread->td_proc == imgp->proc,
278 ("unsafe elf_linux_fixup(), should be curproc"));
279 base = (Elf64_Addr *)*stack_base;
280 args = (Elf64_Auxargs *)imgp->auxargs;
281 pos = base + (imgp->args->argc + imgp->args->envc + 2);
283 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
284 imgp->proc->p_sysent->sv_shared_page_base);
285 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
286 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
287 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
288 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
289 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
290 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
291 AUXARGS_ENTRY(pos, AT_BASE, args->base);
292 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
293 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
294 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
295 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
296 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
297 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
298 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, 0);
299 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
300 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary);
301 if (imgp->execpathp != 0)
302 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp);
303 if (args->execfd != -1)
304 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
305 AUXARGS_ENTRY(pos, AT_NULL, 0);
306 free(imgp->auxargs, M_TEMP);
307 imgp->auxargs = NULL;
310 suword(base, (uint64_t)imgp->args->argc);
312 *stack_base = (register_t *)base;
317 * Copy strings out to the new process address space, constructing new arg
318 * and env vector tables. Return a pointer to the base so that it can be used
319 * as the initial stack pointer.
322 linux_copyout_strings(struct image_params *imgp)
326 char *stringp, *destp;
327 register_t *stack_base;
328 struct ps_strings *arginfo;
329 char canary[LINUX_AT_RANDOM_LEN];
334 * Calculate string base and vector table pointers.
336 if (imgp->execpath != NULL && imgp->auxargs != NULL)
337 execpath_len = strlen(imgp->execpath) + 1;
342 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
343 destp = (caddr_t)arginfo - SPARE_USRSPACE -
344 roundup(sizeof(canary), sizeof(char *)) -
345 roundup(execpath_len, sizeof(char *)) -
346 roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *));
348 if (execpath_len != 0) {
349 imgp->execpathp = (uintptr_t)arginfo - execpath_len;
350 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len);
354 * Prepare the canary for SSP.
356 arc4rand(canary, sizeof(canary), 0);
357 imgp->canary = (uintptr_t)arginfo -
358 roundup(execpath_len, sizeof(char *)) -
359 roundup(sizeof(canary), sizeof(char *));
360 copyout(canary, (void *)imgp->canary, sizeof(canary));
363 * If we have a valid auxargs ptr, prepare some room
368 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
369 * lower compatibility.
371 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size :
372 (LINUX_AT_COUNT * 2);
375 * The '+ 2' is for the null pointers at the end of each of
376 * the arg and env vector sets,and imgp->auxarg_size is room
377 * for argument of Runtime loader.
379 vectp = (char **)(destp - (imgp->args->argc +
380 imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *));
384 * The '+ 2' is for the null pointers at the end of each of
385 * the arg and env vector sets
387 vectp = (char **)(destp - (imgp->args->argc +
388 imgp->args->envc + 2) * sizeof(char *));
392 * vectp also becomes our initial stack base
394 stack_base = (register_t *)vectp;
396 stringp = imgp->args->begin_argv;
397 argc = imgp->args->argc;
398 envc = imgp->args->envc;
401 * Copy out strings - arguments and environment.
403 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
406 * Fill in "ps_strings" struct for ps, w, etc.
408 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp);
409 suword(&arginfo->ps_nargvstr, argc);
412 * Fill in argument portion of vector table.
414 for (; argc > 0; --argc) {
415 suword(vectp++, (long)(intptr_t)destp);
416 while (*stringp++ != 0)
421 /* a null vector table pointer separates the argp's from the envp's */
424 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp);
425 suword(&arginfo->ps_nenvstr, envc);
428 * Fill in environment portion of vector table.
430 for (; envc > 0; --envc) {
431 suword(vectp++, (long)(intptr_t)destp);
432 while (*stringp++ != 0)
437 /* end of vector table is a null pointer */
443 * Reset registers to default values on exec.
446 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
448 struct trapframe *regs = td->td_frame;
449 struct pcb *pcb = td->td_pcb;
452 if (td->td_proc->p_md.md_ldt != NULL)
455 mtx_unlock(&dt_lock);
459 clear_pcb_flags(pcb, PCB_32BIT);
460 pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
461 set_pcb_flags(pcb, PCB_FULL_IRET);
463 bzero((char *)regs, sizeof(struct trapframe));
464 regs->tf_rip = imgp->entry_addr;
465 regs->tf_rsp = stack;
466 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
467 regs->tf_ss = _udatasel;
468 regs->tf_cs = _ucodesel;
469 regs->tf_ds = _udatasel;
470 regs->tf_es = _udatasel;
471 regs->tf_fs = _ufssel;
472 regs->tf_gs = _ugssel;
473 regs->tf_flags = TF_HASSEGS;
476 * Reset the hardware debug registers if they were in use.
477 * They won't have any meaning for the newly exec'd process.
479 if (pcb->pcb_flags & PCB_DBREGS) {
488 * Clear the debug registers on the running
489 * CPU, otherwise they will end up affecting
490 * the next process we switch to.
494 clear_pcb_flags(pcb, PCB_DBREGS);
498 * Drop the FP state if we hold it, so that the process gets a
499 * clean FP state if it uses the FPU again.
505 * Copied from amd64/amd64/machdep.c
507 * XXX fpu state need? don't think so
510 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
513 struct l_ucontext uc;
514 struct l_sigcontext *context;
515 struct trapframe *regs;
516 unsigned long rflags;
521 error = copyin((void *)regs->tf_rbx, &uc, sizeof(uc));
526 context = &uc.uc_mcontext;
527 rflags = context->sc_rflags;
530 * Don't allow users to change privileged or reserved flags.
533 * XXX do allow users to change the privileged flag PSL_RF.
534 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers
535 * should sometimes set it there too. tf_rflags is kept in
536 * the signal context during signal handling and there is no
537 * other place to remember it, so the PSL_RF bit may be
538 * corrupted by the signal handler without us knowing.
539 * Corruption of the PSL_RF bit at worst causes one more or
540 * one less debugger trap, so allowing it is fairly harmless.
543 #define RFLAG_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
544 if (!RFLAG_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
545 printf("linux_rt_sigreturn: rflags = 0x%lx\n", rflags);
550 * Don't allow users to load a valid privileged %cs. Let the
551 * hardware check for invalid selectors, excess privilege in
552 * other selectors, invalid %eip's and invalid %esp's.
554 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
555 if (!CS_SECURE(context->sc_cs)) {
556 printf("linux_rt_sigreturn: cs = 0x%x\n", context->sc_cs);
557 ksiginfo_init_trap(&ksi);
558 ksi.ksi_signo = SIGBUS;
559 ksi.ksi_code = BUS_OBJERR;
560 ksi.ksi_trapno = T_PROTFLT;
561 ksi.ksi_addr = (void *)regs->tf_rip;
562 trapsignal(td, &ksi);
567 linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask);
568 SIG_CANTMASK(td->td_sigmask);
572 regs->tf_rdi = context->sc_rdi;
573 regs->tf_rsi = context->sc_rsi;
574 regs->tf_rdx = context->sc_rdx;
575 regs->tf_rbp = context->sc_rbp;
576 regs->tf_rbx = context->sc_rbx;
577 regs->tf_rcx = context->sc_rcx;
578 regs->tf_rax = context->sc_rax;
579 regs->tf_rip = context->sc_rip;
580 regs->tf_rsp = context->sc_rsp;
581 regs->tf_r8 = context->sc_r8;
582 regs->tf_r9 = context->sc_r9;
583 regs->tf_r10 = context->sc_r10;
584 regs->tf_r11 = context->sc_r11;
585 regs->tf_r12 = context->sc_r12;
586 regs->tf_r13 = context->sc_r13;
587 regs->tf_r14 = context->sc_r14;
588 regs->tf_r15 = context->sc_r15;
589 regs->tf_cs = context->sc_cs;
590 regs->tf_err = context->sc_err;
591 regs->tf_rflags = rflags;
593 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
594 return (EJUSTRETURN);
598 * copied from amd64/amd64/machdep.c
600 * Send an interrupt to process.
603 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
605 struct l_rt_sigframe sf, *sfp;
610 struct trapframe *regs;
616 PROC_LOCK_ASSERT(p, MA_OWNED);
617 sig = ksi->ksi_signo;
619 code = ksi->ksi_code;
620 mtx_assert(&psp->ps_mtx, MA_OWNED);
622 oonstack = sigonstack(regs->tf_rsp);
624 LINUX_CTR4(rt_sendsig, "%p, %d, %p, %u",
625 catcher, sig, mask, code);
627 /* Allocate space for the signal handler context. */
628 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
629 SIGISMEMBER(psp->ps_sigonstack, sig)) {
630 sp = td->td_sigstk.ss_sp + td->td_sigstk.ss_size -
631 sizeof(struct l_rt_sigframe);
633 sp = (caddr_t)regs->tf_rsp - sizeof(struct l_rt_sigframe) - 128;
634 /* Align to 16 bytes. */
635 sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul);
636 mtx_unlock(&psp->ps_mtx);
638 /* Translate the signal. */
639 sig = bsd_to_linux_signal(sig);
641 /* Save user context. */
642 bzero(&sf, sizeof(sf));
643 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_sigmask);
644 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_mcontext.sc_mask);
646 sf.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
647 sf.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
648 sf.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
649 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
652 sf.sf_sc.uc_mcontext.sc_rdi = regs->tf_rdi;
653 sf.sf_sc.uc_mcontext.sc_rsi = regs->tf_rsi;
654 sf.sf_sc.uc_mcontext.sc_rdx = regs->tf_rdx;
655 sf.sf_sc.uc_mcontext.sc_rbp = regs->tf_rbp;
656 sf.sf_sc.uc_mcontext.sc_rbx = regs->tf_rbx;
657 sf.sf_sc.uc_mcontext.sc_rcx = regs->tf_rcx;
658 sf.sf_sc.uc_mcontext.sc_rax = regs->tf_rax;
659 sf.sf_sc.uc_mcontext.sc_rip = regs->tf_rip;
660 sf.sf_sc.uc_mcontext.sc_rsp = regs->tf_rsp;
661 sf.sf_sc.uc_mcontext.sc_r8 = regs->tf_r8;
662 sf.sf_sc.uc_mcontext.sc_r9 = regs->tf_r9;
663 sf.sf_sc.uc_mcontext.sc_r10 = regs->tf_r10;
664 sf.sf_sc.uc_mcontext.sc_r11 = regs->tf_r11;
665 sf.sf_sc.uc_mcontext.sc_r12 = regs->tf_r12;
666 sf.sf_sc.uc_mcontext.sc_r13 = regs->tf_r13;
667 sf.sf_sc.uc_mcontext.sc_r14 = regs->tf_r14;
668 sf.sf_sc.uc_mcontext.sc_r15 = regs->tf_r15;
669 sf.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
670 sf.sf_sc.uc_mcontext.sc_rflags = regs->tf_rflags;
671 sf.sf_sc.uc_mcontext.sc_err = regs->tf_err;
672 sf.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
673 sf.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr;
675 /* Build the argument list for the signal handler. */
676 regs->tf_rdi = sig; /* arg 1 in %rdi */
678 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
679 regs->tf_rdx = (register_t)&sfp->sf_sc; /* arg 3 in %rdx */
681 sf.sf_handler = catcher;
682 /* Fill in POSIX parts */
683 ksiginfo_to_lsiginfo(ksi, &sf.sf_si, sig);
686 * Copy the sigframe out to the user's stack.
688 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
690 printf("process %ld has trashed its stack\n", (long)p->p_pid);
696 regs->tf_rsp = (long)sfp;
697 regs->tf_rip = linux_rt_sigcode;
698 regs->tf_rflags &= ~(PSL_T | PSL_D);
699 regs->tf_cs = _ucodesel;
700 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
702 mtx_lock(&psp->ps_mtx);
706 * If a linux binary is exec'ing something, try this image activator
707 * first. We override standard shell script execution in order to
708 * be able to modify the interpreter path. We only do this if a linux
709 * binary is doing the exec, so we do not create an EXEC module for it.
711 static int exec_linux_imgact_try(struct image_params *iparams);
714 exec_linux_imgact_try(struct image_params *imgp)
716 const char *head = (const char *)imgp->image_header;
721 * The interpreter for shell scripts run from a linux binary needs
722 * to be located in /compat/linux if possible in order to recursively
723 * maintain linux path emulation.
725 if (((const short *)head)[0] == SHELLMAGIC) {
727 * Run our normal shell image activator. If it succeeds
728 * attempt to use the alternate path for the interpreter.
729 * If an alternate path is found, use our stringspace
732 if ((error = exec_shell_imgact(imgp)) == 0) {
733 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc),
734 imgp->interpreter_name, UIO_SYSSPACE,
735 &rpath, 0, AT_FDCWD);
737 len = strlen(rpath) + 1;
739 if (len <= MAXSHELLCMDLEN)
740 memcpy(imgp->interpreter_name,
749 struct sysentvec elf_linux_sysvec = {
750 .sv_size = LINUX_SYS_MAXSYSCALL,
751 .sv_table = linux_sysent,
755 .sv_errsize = ELAST + 1,
756 .sv_errtbl = bsd_to_linux_errno,
757 .sv_transtrap = translate_traps,
758 .sv_fixup = elf_linux_fixup,
759 .sv_sendsig = linux_rt_sendsig,
760 .sv_sigcode = &_binary_linux_locore_o_start,
761 .sv_szsigcode = &linux_szsigcode,
762 .sv_prepsyscall = NULL,
763 .sv_name = "Linux ELF64",
764 .sv_coredump = elf64_coredump,
765 .sv_imgact_try = exec_linux_imgact_try,
766 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
767 .sv_pagesize = PAGE_SIZE,
768 .sv_minuser = VM_MIN_ADDRESS,
769 .sv_maxuser = VM_MAXUSER_ADDRESS,
770 .sv_usrstack = USRSTACK,
771 .sv_psstrings = PS_STRINGS,
772 .sv_stackprot = VM_PROT_ALL,
773 .sv_copyout_strings = linux_copyout_strings,
774 .sv_setregs = linux_exec_setregs,
777 .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP,
778 .sv_set_syscall_retval = linux_set_syscall_retval,
779 .sv_fetch_syscall_args = linux_fetch_syscall_args,
780 .sv_syscallnames = NULL,
781 .sv_shared_page_base = SHAREDPAGE,
782 .sv_shared_page_len = PAGE_SIZE,
783 .sv_schedtail = linux_schedtail,
784 .sv_thread_detach = linux_thread_detach
788 linux_vdso_install(void *param)
791 linux_szsigcode = (&_binary_linux_locore_o_end -
792 &_binary_linux_locore_o_start);
794 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
795 panic("Linux invalid vdso size\n");
797 __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
799 linux_shared_page_obj = __elfN(linux_shared_page_init)
800 (&linux_shared_page_mapping);
802 __elfN(linux_vdso_reloc)(&elf_linux_sysvec, SHAREDPAGE);
804 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
806 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
808 linux_kplatform = linux_shared_page_mapping +
809 (linux_platform - (caddr_t)SHAREDPAGE);
811 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
812 (sysinit_cfunc_t)linux_vdso_install, NULL);
815 linux_vdso_deinstall(void *param)
818 __elfN(linux_shared_page_fini)(linux_shared_page_obj);
820 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
821 (sysinit_cfunc_t)linux_vdso_deinstall, NULL);
823 static char GNULINUX_ABI_VENDOR[] = "GNU";
824 static int GNULINUX_ABI_DESC = 0;
827 linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
829 const Elf32_Word *desc;
832 p = (uintptr_t)(note + 1);
833 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
835 desc = (const Elf32_Word *)p;
836 if (desc[0] != GNULINUX_ABI_DESC)
840 * For linux we encode osrel as follows (see linux_mib.c):
841 * VVVMMMIII (version, major, minor), see linux_mib.c.
843 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3];
848 static Elf_Brandnote linux64_brandnote = {
849 .hdr.n_namesz = sizeof(GNULINUX_ABI_VENDOR),
852 .vendor = GNULINUX_ABI_VENDOR,
853 .flags = BN_TRANSLATE_OSREL,
854 .trans_osrel = linux_trans_osrel
857 static Elf64_Brandinfo linux_glibc2brand = {
858 .brand = ELFOSABI_LINUX,
859 .machine = EM_X86_64,
860 .compat_3_brand = "Linux",
861 .emul_path = "/compat/linux",
862 .interp_path = "/lib64/ld-linux-x86-64.so.2",
863 .sysvec = &elf_linux_sysvec,
864 .interp_newpath = NULL,
865 .brand_note = &linux64_brandnote,
866 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
869 static Elf64_Brandinfo linux_glibc2brandshort = {
870 .brand = ELFOSABI_LINUX,
871 .machine = EM_X86_64,
872 .compat_3_brand = "Linux",
873 .emul_path = "/compat/linux",
874 .interp_path = "/lib64/ld-linux.so.2",
875 .sysvec = &elf_linux_sysvec,
876 .interp_newpath = NULL,
877 .brand_note = &linux64_brandnote,
878 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
881 Elf64_Brandinfo *linux_brandlist[] = {
883 &linux_glibc2brandshort,
888 linux64_elf_modevent(module_t mod, int type, void *data)
890 Elf64_Brandinfo **brandinfo;
892 struct linux_ioctl_handler **lihp;
898 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
900 if (elf64_insert_brand_entry(*brandinfo) < 0)
903 SET_FOREACH(lihp, linux_ioctl_handler_set)
904 linux_ioctl_register_handler(*lihp);
905 LIST_INIT(&futex_list);
906 mtx_init(&futex_mtx, "ftllk64", NULL, MTX_DEF);
907 stclohz = (stathz ? stathz : hz);
909 printf("Linux x86-64 ELF exec handler installed\n");
911 printf("cannot insert Linux x86-64 ELF brand handler\n");
914 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
916 if (elf64_brand_inuse(*brandinfo))
919 for (brandinfo = &linux_brandlist[0];
920 *brandinfo != NULL; ++brandinfo)
921 if (elf64_remove_brand_entry(*brandinfo) < 0)
925 SET_FOREACH(lihp, linux_ioctl_handler_set)
926 linux_ioctl_unregister_handler(*lihp);
927 mtx_destroy(&futex_mtx);
929 printf("Linux ELF exec handler removed\n");
931 printf("Could not deinstall ELF interpreter entry\n");
939 static moduledata_t linux64_elf_mod = {
941 linux64_elf_modevent,
945 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
946 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1);