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 sendsig functions to use the ldebug() facility even though they
105 * are not syscalls themselves. Map them to syscall 0. This is slightly less
106 * bogus than using ldebug(sigreturn).
108 #define LINUX_SYS_linux_rt_sendsig 0
110 const char *linux_kplatform;
111 static int linux_szsigcode;
112 static vm_object_t linux_shared_page_obj;
113 static char *linux_shared_page_mapping;
114 extern char _binary_linux_locore_o_start;
115 extern char _binary_linux_locore_o_end;
117 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
119 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
121 static register_t * linux_copyout_strings(struct image_params *imgp);
122 static int elf_linux_fixup(register_t **stack_base,
123 struct image_params *iparams);
124 static boolean_t linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
125 static void linux_vdso_install(void *param);
126 static void linux_vdso_deinstall(void *param);
127 static void linux_set_syscall_retval(struct thread *td, int error);
128 static int linux_fetch_syscall_args(struct thread *td);
129 static void linux_exec_setregs(struct thread *td, struct image_params *imgp,
131 static int linux_vsyscall(struct thread *td);
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, -61, -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)<nitems(_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)
222 struct trapframe *frame;
223 struct syscall_args *sa;
226 frame = td->td_frame;
229 sa->args[0] = frame->tf_rdi;
230 sa->args[1] = frame->tf_rsi;
231 sa->args[2] = frame->tf_rdx;
232 sa->args[3] = frame->tf_rcx;
233 sa->args[4] = frame->tf_r8;
234 sa->args[5] = frame->tf_r9;
235 sa->code = frame->tf_rax;
237 if (sa->code >= p->p_sysent->sv_size)
239 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
241 sa->callp = &p->p_sysent->sv_table[sa->code];
242 sa->narg = sa->callp->sy_narg;
244 td->td_retval[0] = 0;
249 linux_set_syscall_retval(struct thread *td, int error)
251 struct trapframe *frame = td->td_frame;
254 * On Linux only %rcx and %r11 values are not preserved across
255 * the syscall. So, do not clobber %rdx and %r10.
257 td->td_retval[1] = frame->tf_rdx;
258 frame->tf_r10 = frame->tf_rcx;
260 cpu_set_syscall_retval(td, error);
262 /* Restore all registers. */
263 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
267 elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
272 struct ps_strings *arginfo;
277 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
279 KASSERT(curthread->td_proc == imgp->proc,
280 ("unsafe elf_linux_fixup(), should be curproc"));
281 base = (Elf64_Addr *)*stack_base;
282 args = (Elf64_Auxargs *)imgp->auxargs;
283 pos = base + (imgp->args->argc + imgp->args->envc + 2);
285 issetugid = p->p_flag & P_SUGID ? 1 : 0;
286 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
287 imgp->proc->p_sysent->sv_shared_page_base);
288 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
289 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
290 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
291 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
292 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
293 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
294 AUXARGS_ENTRY(pos, AT_BASE, args->base);
295 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
296 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
297 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
298 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
299 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
300 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
301 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
302 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
303 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary);
304 if (imgp->execpathp != 0)
305 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp);
306 if (args->execfd != -1)
307 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
308 AUXARGS_ENTRY(pos, AT_NULL, 0);
309 free(imgp->auxargs, M_TEMP);
310 imgp->auxargs = NULL;
313 suword(base, (uint64_t)imgp->args->argc);
315 *stack_base = (register_t *)base;
320 * Copy strings out to the new process address space, constructing new arg
321 * and env vector tables. Return a pointer to the base so that it can be used
322 * as the initial stack pointer.
325 linux_copyout_strings(struct image_params *imgp)
329 char *stringp, *destp;
330 register_t *stack_base;
331 struct ps_strings *arginfo;
332 char canary[LINUX_AT_RANDOM_LEN];
336 /* Calculate string base and vector table pointers. */
337 if (imgp->execpath != NULL && imgp->auxargs != NULL)
338 execpath_len = strlen(imgp->execpath) + 1;
343 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
344 destp = (caddr_t)arginfo - SPARE_USRSPACE -
345 roundup(sizeof(canary), sizeof(char *)) -
346 roundup(execpath_len, sizeof(char *)) -
347 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));
349 if (execpath_len != 0) {
350 imgp->execpathp = (uintptr_t)arginfo - execpath_len;
351 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len);
354 /* Prepare the canary for SSP. */
355 arc4rand(canary, sizeof(canary), 0);
356 imgp->canary = (uintptr_t)arginfo -
357 roundup(execpath_len, sizeof(char *)) -
358 roundup(sizeof(canary), sizeof(char *));
359 copyout(canary, (void *)imgp->canary, sizeof(canary));
361 /* If we have a valid auxargs ptr, prepare some room on the stack. */
364 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
365 * lower compatibility.
367 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size :
368 (LINUX_AT_COUNT * 2);
371 * The '+ 2' is for the null pointers at the end of each of
372 * the arg and env vector sets,and imgp->auxarg_size is room
373 * for argument of Runtime loader.
375 vectp = (char **)(destp - (imgp->args->argc +
376 imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *));
380 * The '+ 2' is for the null pointers at the end of each of
381 * the arg and env vector sets
383 vectp = (char **)(destp - (imgp->args->argc +
384 imgp->args->envc + 2) * sizeof(char *));
387 /* vectp also becomes our initial stack base. */
388 stack_base = (register_t *)vectp;
390 stringp = imgp->args->begin_argv;
391 argc = imgp->args->argc;
392 envc = imgp->args->envc;
394 /* Copy out strings - arguments and environment. */
395 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
397 /* Fill in "ps_strings" struct for ps, w, etc. */
398 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp);
399 suword(&arginfo->ps_nargvstr, argc);
401 /* Fill in argument portion of vector table. */
402 for (; argc > 0; --argc) {
403 suword(vectp++, (long)(intptr_t)destp);
404 while (*stringp++ != 0)
409 /* A null vector table pointer separates the argp's from the envp's. */
412 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp);
413 suword(&arginfo->ps_nenvstr, envc);
415 /* Fill in environment portion of vector table. */
416 for (; envc > 0; --envc) {
417 suword(vectp++, (long)(intptr_t)destp);
418 while (*stringp++ != 0)
423 /* The end of the vector table is a null pointer. */
429 * Reset registers to default values on exec.
432 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
434 struct trapframe *regs = td->td_frame;
435 struct pcb *pcb = td->td_pcb;
437 if (td->td_proc->p_md.md_ldt != NULL)
442 clear_pcb_flags(pcb, PCB_32BIT);
443 pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
444 set_pcb_flags(pcb, PCB_FULL_IRET);
446 bzero((char *)regs, sizeof(struct trapframe));
447 regs->tf_rip = imgp->entry_addr;
448 regs->tf_rsp = stack;
449 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
450 regs->tf_ss = _udatasel;
451 regs->tf_cs = _ucodesel;
452 regs->tf_ds = _udatasel;
453 regs->tf_es = _udatasel;
454 regs->tf_fs = _ufssel;
455 regs->tf_gs = _ugssel;
456 regs->tf_flags = TF_HASSEGS;
459 * Reset the hardware debug registers if they were in use.
460 * They won't have any meaning for the newly exec'd process.
462 if (pcb->pcb_flags & PCB_DBREGS) {
471 * Clear the debug registers on the running
472 * CPU, otherwise they will end up affecting
473 * the next process we switch to.
477 clear_pcb_flags(pcb, PCB_DBREGS);
481 * Drop the FP state if we hold it, so that the process gets a
482 * clean FP state if it uses the FPU again.
488 * Copied from amd64/amd64/machdep.c
490 * XXX fpu state need? don't think so
493 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
496 struct l_ucontext uc;
497 struct l_sigcontext *context;
498 struct trapframe *regs;
499 unsigned long rflags;
504 error = copyin((void *)regs->tf_rbx, &uc, sizeof(uc));
509 context = &uc.uc_mcontext;
510 rflags = context->sc_rflags;
513 * Don't allow users to change privileged or reserved flags.
516 * XXX do allow users to change the privileged flag PSL_RF.
517 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers
518 * should sometimes set it there too. tf_rflags is kept in
519 * the signal context during signal handling and there is no
520 * other place to remember it, so the PSL_RF bit may be
521 * corrupted by the signal handler without us knowing.
522 * Corruption of the PSL_RF bit at worst causes one more or
523 * one less debugger trap, so allowing it is fairly harmless.
526 #define RFLAG_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
527 if (!RFLAG_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
528 printf("linux_rt_sigreturn: rflags = 0x%lx\n", rflags);
533 * Don't allow users to load a valid privileged %cs. Let the
534 * hardware check for invalid selectors, excess privilege in
535 * other selectors, invalid %eip's and invalid %esp's.
537 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
538 if (!CS_SECURE(context->sc_cs)) {
539 printf("linux_rt_sigreturn: cs = 0x%x\n", context->sc_cs);
540 ksiginfo_init_trap(&ksi);
541 ksi.ksi_signo = SIGBUS;
542 ksi.ksi_code = BUS_OBJERR;
543 ksi.ksi_trapno = T_PROTFLT;
544 ksi.ksi_addr = (void *)regs->tf_rip;
545 trapsignal(td, &ksi);
550 linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask);
551 SIG_CANTMASK(td->td_sigmask);
555 regs->tf_rdi = context->sc_rdi;
556 regs->tf_rsi = context->sc_rsi;
557 regs->tf_rdx = context->sc_rdx;
558 regs->tf_rbp = context->sc_rbp;
559 regs->tf_rbx = context->sc_rbx;
560 regs->tf_rcx = context->sc_rcx;
561 regs->tf_rax = context->sc_rax;
562 regs->tf_rip = context->sc_rip;
563 regs->tf_rsp = context->sc_rsp;
564 regs->tf_r8 = context->sc_r8;
565 regs->tf_r9 = context->sc_r9;
566 regs->tf_r10 = context->sc_r10;
567 regs->tf_r11 = context->sc_r11;
568 regs->tf_r12 = context->sc_r12;
569 regs->tf_r13 = context->sc_r13;
570 regs->tf_r14 = context->sc_r14;
571 regs->tf_r15 = context->sc_r15;
572 regs->tf_cs = context->sc_cs;
573 regs->tf_err = context->sc_err;
574 regs->tf_rflags = rflags;
576 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
577 return (EJUSTRETURN);
581 * copied from amd64/amd64/machdep.c
583 * Send an interrupt to process.
586 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
588 struct l_rt_sigframe sf, *sfp;
593 struct trapframe *regs;
599 PROC_LOCK_ASSERT(p, MA_OWNED);
600 sig = ksi->ksi_signo;
602 code = ksi->ksi_code;
603 mtx_assert(&psp->ps_mtx, MA_OWNED);
605 oonstack = sigonstack(regs->tf_rsp);
607 LINUX_CTR4(rt_sendsig, "%p, %d, %p, %u",
608 catcher, sig, mask, code);
610 /* Allocate space for the signal handler context. */
611 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
612 SIGISMEMBER(psp->ps_sigonstack, sig)) {
613 sp = (caddr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size -
614 sizeof(struct l_rt_sigframe);
616 sp = (caddr_t)regs->tf_rsp - sizeof(struct l_rt_sigframe) - 128;
617 /* Align to 16 bytes. */
618 sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul);
619 mtx_unlock(&psp->ps_mtx);
621 /* Translate the signal. */
622 sig = bsd_to_linux_signal(sig);
624 /* Save user context. */
625 bzero(&sf, sizeof(sf));
626 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_sigmask);
627 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_mcontext.sc_mask);
629 sf.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
630 sf.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
631 sf.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
632 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
635 sf.sf_sc.uc_mcontext.sc_rdi = regs->tf_rdi;
636 sf.sf_sc.uc_mcontext.sc_rsi = regs->tf_rsi;
637 sf.sf_sc.uc_mcontext.sc_rdx = regs->tf_rdx;
638 sf.sf_sc.uc_mcontext.sc_rbp = regs->tf_rbp;
639 sf.sf_sc.uc_mcontext.sc_rbx = regs->tf_rbx;
640 sf.sf_sc.uc_mcontext.sc_rcx = regs->tf_rcx;
641 sf.sf_sc.uc_mcontext.sc_rax = regs->tf_rax;
642 sf.sf_sc.uc_mcontext.sc_rip = regs->tf_rip;
643 sf.sf_sc.uc_mcontext.sc_rsp = regs->tf_rsp;
644 sf.sf_sc.uc_mcontext.sc_r8 = regs->tf_r8;
645 sf.sf_sc.uc_mcontext.sc_r9 = regs->tf_r9;
646 sf.sf_sc.uc_mcontext.sc_r10 = regs->tf_r10;
647 sf.sf_sc.uc_mcontext.sc_r11 = regs->tf_r11;
648 sf.sf_sc.uc_mcontext.sc_r12 = regs->tf_r12;
649 sf.sf_sc.uc_mcontext.sc_r13 = regs->tf_r13;
650 sf.sf_sc.uc_mcontext.sc_r14 = regs->tf_r14;
651 sf.sf_sc.uc_mcontext.sc_r15 = regs->tf_r15;
652 sf.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
653 sf.sf_sc.uc_mcontext.sc_rflags = regs->tf_rflags;
654 sf.sf_sc.uc_mcontext.sc_err = regs->tf_err;
655 sf.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
656 sf.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr;
658 /* Build the argument list for the signal handler. */
659 regs->tf_rdi = sig; /* arg 1 in %rdi */
661 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
662 regs->tf_rdx = (register_t)&sfp->sf_sc; /* arg 3 in %rdx */
664 sf.sf_handler = catcher;
665 /* Fill in POSIX parts. */
666 ksiginfo_to_lsiginfo(ksi, &sf.sf_si, sig);
668 /* Copy the sigframe out to the user's stack. */
669 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
671 printf("process %ld has trashed its stack\n", (long)p->p_pid);
677 regs->tf_rsp = (long)sfp;
678 regs->tf_rip = linux_rt_sigcode;
679 regs->tf_rflags &= ~(PSL_T | PSL_D);
680 regs->tf_cs = _ucodesel;
681 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
683 mtx_lock(&psp->ps_mtx);
687 * If a Linux binary is exec'ing something, try this image activator
688 * first. We override standard shell script execution in order to
689 * be able to modify the interpreter path. We only do this if a Linux
690 * binary is doing the exec, so we do not create an EXEC module for it.
692 static int exec_linux_imgact_try(struct image_params *iparams);
695 exec_linux_imgact_try(struct image_params *imgp)
697 const char *head = (const char *)imgp->image_header;
702 * The interpreter for shell scripts run from a Linux binary needs
703 * to be located in /compat/linux if possible in order to recursively
704 * maintain Linux path emulation.
706 if (((const short *)head)[0] == SHELLMAGIC) {
708 * Run our normal shell image activator. If it succeeds
709 * attempt to use the alternate path for the interpreter.
710 * If an alternate path is found, use our stringspace
713 if ((error = exec_shell_imgact(imgp)) == 0) {
714 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc),
715 imgp->interpreter_name, UIO_SYSSPACE,
716 &rpath, 0, AT_FDCWD);
718 imgp->args->fname_buf =
719 imgp->interpreter_name = rpath;
725 #define LINUX_VSYSCALL_START (-10UL << 20)
726 #define LINUX_VSYSCALL_SZ 1024
728 const unsigned long linux_vsyscall_vector[] = {
729 LINUX_SYS_gettimeofday,
730 LINUX_SYS_linux_time,
731 /* getcpu not implemented */
735 linux_vsyscall(struct thread *td)
737 struct trapframe *frame;
742 frame = td->td_frame;
744 /* Check %rip for vsyscall area. */
745 if (__predict_true(frame->tf_rip < LINUX_VSYSCALL_START))
747 if ((frame->tf_rip & (LINUX_VSYSCALL_SZ - 1)) != 0)
749 code = (frame->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SZ;
750 if (code >= nitems(linux_vsyscall_vector))
754 * vsyscall called as callq *(%rax), so we must
755 * use return address from %rsp and also fixup %rsp.
757 error = copyin((void *)frame->tf_rsp, &retqaddr, sizeof(retqaddr));
761 frame->tf_rip = retqaddr;
762 frame->tf_rax = linux_vsyscall_vector[code];
765 traced = (frame->tf_flags & PSL_T);
767 amd64_syscall(td, traced);
772 struct sysentvec elf_linux_sysvec = {
773 .sv_size = LINUX_SYS_MAXSYSCALL,
774 .sv_table = linux_sysent,
776 .sv_errsize = ELAST + 1,
777 .sv_errtbl = bsd_to_linux_errno,
778 .sv_transtrap = translate_traps,
779 .sv_fixup = elf_linux_fixup,
780 .sv_sendsig = linux_rt_sendsig,
781 .sv_sigcode = &_binary_linux_locore_o_start,
782 .sv_szsigcode = &linux_szsigcode,
783 .sv_name = "Linux ELF64",
784 .sv_coredump = elf64_coredump,
785 .sv_imgact_try = exec_linux_imgact_try,
786 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
787 .sv_pagesize = PAGE_SIZE,
788 .sv_minuser = VM_MIN_ADDRESS,
789 .sv_maxuser = VM_MAXUSER_ADDRESS,
790 .sv_usrstack = USRSTACK,
791 .sv_psstrings = PS_STRINGS,
792 .sv_stackprot = VM_PROT_ALL,
793 .sv_copyout_strings = linux_copyout_strings,
794 .sv_setregs = linux_exec_setregs,
797 .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP,
798 .sv_set_syscall_retval = linux_set_syscall_retval,
799 .sv_fetch_syscall_args = linux_fetch_syscall_args,
800 .sv_syscallnames = NULL,
801 .sv_shared_page_base = SHAREDPAGE,
802 .sv_shared_page_len = PAGE_SIZE,
803 .sv_schedtail = linux_schedtail,
804 .sv_thread_detach = linux_thread_detach,
805 .sv_trap = linux_vsyscall,
809 linux_vdso_install(void *param)
812 amd64_lower_shared_page(&elf_linux_sysvec);
814 linux_szsigcode = (&_binary_linux_locore_o_end -
815 &_binary_linux_locore_o_start);
817 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
818 panic("Linux invalid vdso size\n");
820 __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
822 linux_shared_page_obj = __elfN(linux_shared_page_init)
823 (&linux_shared_page_mapping);
825 __elfN(linux_vdso_reloc)(&elf_linux_sysvec);
827 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
829 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
831 linux_kplatform = linux_shared_page_mapping +
832 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base);
834 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
835 (sysinit_cfunc_t)linux_vdso_install, NULL);
838 linux_vdso_deinstall(void *param)
841 __elfN(linux_shared_page_fini)(linux_shared_page_obj);
843 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
844 (sysinit_cfunc_t)linux_vdso_deinstall, NULL);
846 static char GNULINUX_ABI_VENDOR[] = "GNU";
847 static int GNULINUX_ABI_DESC = 0;
850 linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
852 const Elf32_Word *desc;
855 p = (uintptr_t)(note + 1);
856 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
858 desc = (const Elf32_Word *)p;
859 if (desc[0] != GNULINUX_ABI_DESC)
863 * For Linux we encode osrel as follows (see linux_mib.c):
864 * VVVMMMIII (version, major, minor), see linux_mib.c.
866 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3];
871 static Elf_Brandnote linux64_brandnote = {
872 .hdr.n_namesz = sizeof(GNULINUX_ABI_VENDOR),
875 .vendor = GNULINUX_ABI_VENDOR,
876 .flags = BN_TRANSLATE_OSREL,
877 .trans_osrel = linux_trans_osrel
880 static Elf64_Brandinfo linux_glibc2brand = {
881 .brand = ELFOSABI_LINUX,
882 .machine = EM_X86_64,
883 .compat_3_brand = "Linux",
884 .emul_path = "/compat/linux",
885 .interp_path = "/lib64/ld-linux-x86-64.so.2",
886 .sysvec = &elf_linux_sysvec,
887 .interp_newpath = NULL,
888 .brand_note = &linux64_brandnote,
889 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
892 static Elf64_Brandinfo linux_glibc2brandshort = {
893 .brand = ELFOSABI_LINUX,
894 .machine = EM_X86_64,
895 .compat_3_brand = "Linux",
896 .emul_path = "/compat/linux",
897 .interp_path = "/lib64/ld-linux.so.2",
898 .sysvec = &elf_linux_sysvec,
899 .interp_newpath = NULL,
900 .brand_note = &linux64_brandnote,
901 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
904 static Elf64_Brandinfo linux_muslbrand = {
905 .brand = ELFOSABI_LINUX,
906 .machine = EM_X86_64,
907 .compat_3_brand = "Linux",
908 .emul_path = "/compat/linux",
909 .interp_path = "/lib/ld-musl-x86_64.so.1",
910 .sysvec = &elf_linux_sysvec,
911 .interp_newpath = NULL,
912 .brand_note = &linux64_brandnote,
913 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
916 Elf64_Brandinfo *linux_brandlist[] = {
918 &linux_glibc2brandshort,
924 linux64_elf_modevent(module_t mod, int type, void *data)
926 Elf64_Brandinfo **brandinfo;
928 struct linux_ioctl_handler **lihp;
934 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
936 if (elf64_insert_brand_entry(*brandinfo) < 0)
939 SET_FOREACH(lihp, linux_ioctl_handler_set)
940 linux_ioctl_register_handler(*lihp);
941 LIST_INIT(&futex_list);
942 mtx_init(&futex_mtx, "ftllk64", NULL, MTX_DEF);
943 stclohz = (stathz ? stathz : hz);
945 printf("Linux x86-64 ELF exec handler installed\n");
947 printf("cannot insert Linux x86-64 ELF brand handler\n");
950 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
952 if (elf64_brand_inuse(*brandinfo))
955 for (brandinfo = &linux_brandlist[0];
956 *brandinfo != NULL; ++brandinfo)
957 if (elf64_remove_brand_entry(*brandinfo) < 0)
961 SET_FOREACH(lihp, linux_ioctl_handler_set)
962 linux_ioctl_unregister_handler(*lihp);
963 mtx_destroy(&futex_mtx);
965 printf("Linux ELF exec handler removed\n");
967 printf("Could not deinstall ELF interpreter entry\n");
975 static moduledata_t linux64_elf_mod = {
977 linux64_elf_modevent,
981 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
982 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1);
983 FEATURE(linux64, "Linux 64bit support");