2 * Copyright (c) 1994-1996 Søren Schmidt
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/fcntl.h>
36 #include <sys/imgact.h>
37 #include <sys/imgact_aout.h>
38 #include <sys/imgact_elf.h>
39 #include <sys/kernel.h>
41 #include <sys/malloc.h>
42 #include <sys/module.h>
43 #include <sys/mutex.h>
45 #include <sys/signalvar.h>
46 #include <sys/syscallsubr.h>
47 #include <sys/sysent.h>
48 #include <sys/sysproto.h>
49 #include <sys/vnode.h>
50 #include <sys/eventhandler.h>
54 #include <vm/vm_extern.h>
55 #include <vm/vm_map.h>
56 #include <vm/vm_object.h>
57 #include <vm/vm_page.h>
58 #include <vm/vm_param.h>
60 #include <machine/cpu.h>
61 #include <machine/cputypes.h>
62 #include <machine/md_var.h>
63 #include <machine/pcb.h>
65 #include <i386/linux/linux.h>
66 #include <i386/linux/linux_proto.h>
67 #include <compat/linux/linux_emul.h>
68 #include <compat/linux/linux_futex.h>
69 #include <compat/linux/linux_ioctl.h>
70 #include <compat/linux/linux_mib.h>
71 #include <compat/linux/linux_misc.h>
72 #include <compat/linux/linux_signal.h>
73 #include <compat/linux/linux_util.h>
75 MODULE_VERSION(linux, 1);
77 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
79 #if BYTE_ORDER == LITTLE_ENDIAN
80 #define SHELLMAGIC 0x2123 /* #! */
82 #define SHELLMAGIC 0x2321
86 * Allow the sendsig functions to use the ldebug() facility
87 * even though they are not syscalls themselves. Map them
88 * to syscall 0. This is slightly less bogus than using
91 #define LINUX_SYS_linux_rt_sendsig 0
92 #define LINUX_SYS_linux_sendsig 0
94 #define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings))
96 extern char linux_sigcode[];
97 extern int linux_szsigcode;
99 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
101 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
102 SET_DECLARE(linux_device_handler_set, struct linux_device_handler);
104 static int linux_fixup(register_t **stack_base,
105 struct image_params *iparams);
106 static int elf_linux_fixup(register_t **stack_base,
107 struct image_params *iparams);
108 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
109 static void exec_linux_setregs(struct thread *td,
110 struct image_params *imgp, u_long stack);
111 static register_t *linux_copyout_strings(struct image_params *imgp);
112 static boolean_t linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
114 static int linux_szplatform;
115 const char *linux_platform;
117 static eventhandler_tag linux_exit_tag;
118 static eventhandler_tag linux_exec_tag;
121 * Linux syscalls return negative errno's, we do positive and map them
123 * FreeBSD: src/sys/sys/errno.h
124 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h
125 * linux-2.6.17.8/include/asm-generic/errno.h
127 static int bsd_to_linux_errno[ELAST + 1] = {
128 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9,
129 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
130 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
131 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
132 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
133 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
134 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
135 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9,
136 -6, -6, -43, -42, -75,-125, -84, -95, -16, -74,
140 int bsd_to_linux_signal[LINUX_SIGTBLSZ] = {
141 LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL,
142 LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE,
143 LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, LINUX_SIGSYS,
144 LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG,
145 LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD,
146 LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU,
147 LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH,
148 0, LINUX_SIGUSR1, LINUX_SIGUSR2
151 int linux_to_bsd_signal[LINUX_SIGTBLSZ] = {
152 SIGHUP, SIGINT, SIGQUIT, SIGILL,
153 SIGTRAP, SIGABRT, SIGBUS, SIGFPE,
154 SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2,
155 SIGPIPE, SIGALRM, SIGTERM, SIGBUS,
156 SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP,
157 SIGTTIN, SIGTTOU, SIGURG, SIGXCPU,
158 SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH,
159 SIGIO, SIGURG, SIGSYS
162 #define LINUX_T_UNKNOWN 255
163 static int _bsd_to_linux_trapcode[] = {
164 LINUX_T_UNKNOWN, /* 0 */
165 6, /* 1 T_PRIVINFLT */
166 LINUX_T_UNKNOWN, /* 2 */
168 LINUX_T_UNKNOWN, /* 4 */
169 LINUX_T_UNKNOWN, /* 5 */
170 16, /* 6 T_ARITHTRAP */
171 254, /* 7 T_ASTFLT */
172 LINUX_T_UNKNOWN, /* 8 */
173 13, /* 9 T_PROTFLT */
174 1, /* 10 T_TRCTRAP */
175 LINUX_T_UNKNOWN, /* 11 */
176 14, /* 12 T_PAGEFLT */
177 LINUX_T_UNKNOWN, /* 13 */
178 17, /* 14 T_ALIGNFLT */
179 LINUX_T_UNKNOWN, /* 15 */
180 LINUX_T_UNKNOWN, /* 16 */
181 LINUX_T_UNKNOWN, /* 17 */
187 8, /* 23 T_DOUBLEFLT */
188 9, /* 24 T_FPOPFLT */
189 10, /* 25 T_TSSFLT */
190 11, /* 26 T_SEGNPFLT */
191 12, /* 27 T_STKFLT */
193 19, /* 29 T_XMMFLT */
194 15 /* 30 T_RESERVED */
196 #define bsd_to_linux_trapcode(code) \
197 ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \
198 _bsd_to_linux_trapcode[(code)]: \
202 * If FreeBSD & Linux have a difference of opinion about what a trap
203 * means, deal with it here.
208 translate_traps(int signal, int trap_code)
210 if (signal != SIGBUS)
224 linux_fixup(register_t **stack_base, struct image_params *imgp)
226 register_t *argv, *envp;
229 envp = *stack_base + (imgp->args->argc + 1);
231 suword(*stack_base, (intptr_t)(void *)envp);
233 suword(*stack_base, (intptr_t)(void *)argv);
235 suword(*stack_base, imgp->args->argc);
240 elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
244 Elf32_Addr *uplatform;
245 struct ps_strings *arginfo;
249 KASSERT(curthread->td_proc == imgp->proc,
250 ("unsafe elf_linux_fixup(), should be curproc"));
253 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
254 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
255 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform);
256 args = (Elf32_Auxargs *)imgp->auxargs;
257 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2);
259 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
262 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
263 * as it has appeared in the 2.4.0-rc7 first time.
264 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
265 * glibc falls back to the hard-coded CLK_TCK value when aux entry
267 * Also see linux_times() implementation.
269 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
270 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
271 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
272 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
273 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
274 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
275 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
276 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
277 AUXARGS_ENTRY(pos, AT_BASE, args->base);
278 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
279 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
280 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
281 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
282 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
283 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(uplatform));
284 if (args->execfd != -1)
285 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
286 AUXARGS_ENTRY(pos, AT_NULL, 0);
288 free(imgp->auxargs, M_TEMP);
289 imgp->auxargs = NULL;
292 suword(*stack_base, (register_t)imgp->args->argc);
297 * Copied from kern/kern_exec.c
300 linux_copyout_strings(struct image_params *imgp)
304 char *stringp, *destp;
305 register_t *stack_base;
306 struct ps_strings *arginfo;
310 * Calculate string base and vector table pointers.
311 * Also deal with signal trampoline code for this exec type.
314 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
315 destp = (caddr_t)arginfo - SPARE_USRSPACE - linux_szplatform -
316 roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *));
319 * install LINUX_PLATFORM
321 copyout(linux_platform, ((caddr_t)arginfo - linux_szplatform),
325 * If we have a valid auxargs ptr, prepare some room
330 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
331 * lower compatibility.
333 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size :
334 (LINUX_AT_COUNT * 2);
336 * The '+ 2' is for the null pointers at the end of each of
337 * the arg and env vector sets,and imgp->auxarg_size is room
338 * for argument of Runtime loader.
340 vectp = (char **)(destp - (imgp->args->argc +
341 imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *));
344 * The '+ 2' is for the null pointers at the end of each of
345 * the arg and env vector sets
347 vectp = (char **)(destp - (imgp->args->argc + imgp->args->envc + 2) *
352 * vectp also becomes our initial stack base
354 stack_base = (register_t *)vectp;
356 stringp = imgp->args->begin_argv;
357 argc = imgp->args->argc;
358 envc = imgp->args->envc;
361 * Copy out strings - arguments and environment.
363 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
366 * Fill in "ps_strings" struct for ps, w, etc.
368 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp);
369 suword(&arginfo->ps_nargvstr, argc);
372 * Fill in argument portion of vector table.
374 for (; argc > 0; --argc) {
375 suword(vectp++, (long)(intptr_t)destp);
376 while (*stringp++ != 0)
381 /* a null vector table pointer separates the argp's from the envp's */
384 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp);
385 suword(&arginfo->ps_nenvstr, envc);
388 * Fill in environment portion of vector table.
390 for (; envc > 0; --envc) {
391 suword(vectp++, (long)(intptr_t)destp);
392 while (*stringp++ != 0)
397 /* end of vector table is a null pointer */
405 extern int _ucodesel, _udatasel;
406 extern unsigned long linux_sznonrtsigcode;
409 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
411 struct thread *td = curthread;
412 struct proc *p = td->td_proc;
414 struct trapframe *regs;
415 struct l_rt_sigframe *fp, frame;
419 sig = ksi->ksi_signo;
420 code = ksi->ksi_code;
421 PROC_LOCK_ASSERT(p, MA_OWNED);
423 mtx_assert(&psp->ps_mtx, MA_OWNED);
425 oonstack = sigonstack(regs->tf_esp);
428 if (ldebug(rt_sendsig))
429 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"),
430 catcher, sig, (void*)mask, code);
433 * Allocate space for the signal handler context.
435 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
436 SIGISMEMBER(psp->ps_sigonstack, sig)) {
437 fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp +
438 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
440 fp = (struct l_rt_sigframe *)regs->tf_esp - 1;
441 mtx_unlock(&psp->ps_mtx);
444 * Build the argument list for the signal handler.
446 if (p->p_sysent->sv_sigtbl)
447 if (sig <= p->p_sysent->sv_sigsize)
448 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
450 bzero(&frame, sizeof(frame));
452 frame.sf_handler = catcher;
454 frame.sf_siginfo = &fp->sf_si;
455 frame.sf_ucontext = &fp->sf_sc;
457 /* Fill in POSIX parts */
458 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig);
461 * Build the signal context to be used by sigreturn.
463 frame.sf_sc.uc_flags = 0; /* XXX ??? */
464 frame.sf_sc.uc_link = NULL; /* XXX ??? */
466 frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp;
467 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
468 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
469 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
472 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
474 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0];
475 frame.sf_sc.uc_mcontext.sc_gs = rgs();
476 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs;
477 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es;
478 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds;
479 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi;
480 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi;
481 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp;
482 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx;
483 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx;
484 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx;
485 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax;
486 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip;
487 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
488 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags;
489 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp;
490 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss;
491 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err;
492 frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr;
493 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
496 if (ldebug(rt_sendsig))
497 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"),
498 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp,
499 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask);
502 if (copyout(&frame, fp, sizeof(frame)) != 0) {
504 * Process has trashed its stack; give it an illegal
505 * instruction to halt it in its tracks.
508 if (ldebug(rt_sendsig))
509 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"),
517 * Build context to run handler in.
519 regs->tf_esp = (int)fp;
520 regs->tf_eip = p->p_sysent->sv_sigcode_base + linux_sznonrtsigcode;
521 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
522 regs->tf_cs = _ucodesel;
523 regs->tf_ds = _udatasel;
524 regs->tf_es = _udatasel;
525 regs->tf_fs = _udatasel;
526 regs->tf_ss = _udatasel;
528 mtx_lock(&psp->ps_mtx);
533 * Send an interrupt to process.
535 * Stack is set up to allow sigcode stored
536 * in u. to call routine, followed by kcall
537 * to sigreturn routine below. After sigreturn
538 * resets the signal mask, the stack, and the
539 * frame pointer, it returns to the user
543 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
545 struct thread *td = curthread;
546 struct proc *p = td->td_proc;
548 struct trapframe *regs;
549 struct l_sigframe *fp, frame;
554 PROC_LOCK_ASSERT(p, MA_OWNED);
556 sig = ksi->ksi_signo;
557 code = ksi->ksi_code;
558 mtx_assert(&psp->ps_mtx, MA_OWNED);
559 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
560 /* Signal handler installed with SA_SIGINFO. */
561 linux_rt_sendsig(catcher, ksi, mask);
565 oonstack = sigonstack(regs->tf_esp);
569 printf(ARGS(sendsig, "%p, %d, %p, %u"),
570 catcher, sig, (void*)mask, code);
574 * Allocate space for the signal handler context.
576 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
577 SIGISMEMBER(psp->ps_sigonstack, sig)) {
578 fp = (struct l_sigframe *)(td->td_sigstk.ss_sp +
579 td->td_sigstk.ss_size - sizeof(struct l_sigframe));
581 fp = (struct l_sigframe *)regs->tf_esp - 1;
582 mtx_unlock(&psp->ps_mtx);
586 * Build the argument list for the signal handler.
588 if (p->p_sysent->sv_sigtbl)
589 if (sig <= p->p_sysent->sv_sigsize)
590 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
592 bzero(&frame, sizeof(frame));
594 frame.sf_handler = catcher;
597 bsd_to_linux_sigset(mask, &lmask);
600 * Build the signal context to be used by sigreturn.
602 frame.sf_sc.sc_mask = lmask.__bits[0];
603 frame.sf_sc.sc_gs = rgs();
604 frame.sf_sc.sc_fs = regs->tf_fs;
605 frame.sf_sc.sc_es = regs->tf_es;
606 frame.sf_sc.sc_ds = regs->tf_ds;
607 frame.sf_sc.sc_edi = regs->tf_edi;
608 frame.sf_sc.sc_esi = regs->tf_esi;
609 frame.sf_sc.sc_ebp = regs->tf_ebp;
610 frame.sf_sc.sc_ebx = regs->tf_ebx;
611 frame.sf_sc.sc_edx = regs->tf_edx;
612 frame.sf_sc.sc_ecx = regs->tf_ecx;
613 frame.sf_sc.sc_eax = regs->tf_eax;
614 frame.sf_sc.sc_eip = regs->tf_eip;
615 frame.sf_sc.sc_cs = regs->tf_cs;
616 frame.sf_sc.sc_eflags = regs->tf_eflags;
617 frame.sf_sc.sc_esp_at_signal = regs->tf_esp;
618 frame.sf_sc.sc_ss = regs->tf_ss;
619 frame.sf_sc.sc_err = regs->tf_err;
620 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr;
621 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno);
623 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++)
624 frame.sf_extramask[i] = lmask.__bits[i+1];
626 if (copyout(&frame, fp, sizeof(frame)) != 0) {
628 * Process has trashed its stack; give it an illegal
629 * instruction to halt it in its tracks.
636 * Build context to run handler in.
638 regs->tf_esp = (int)fp;
639 regs->tf_eip = p->p_sysent->sv_sigcode_base;
640 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
641 regs->tf_cs = _ucodesel;
642 regs->tf_ds = _udatasel;
643 regs->tf_es = _udatasel;
644 regs->tf_fs = _udatasel;
645 regs->tf_ss = _udatasel;
647 mtx_lock(&psp->ps_mtx);
651 * System call to cleanup state after a signal
652 * has been taken. Reset signal mask and
653 * stack state from context left by sendsig (above).
654 * Return to previous pc and psl as specified by
655 * context left by sendsig. Check carefully to
656 * make sure that the user has not modified the
657 * psl to gain improper privileges or to cause
661 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
663 struct l_sigframe frame;
664 struct trapframe *regs;
673 if (ldebug(sigreturn))
674 printf(ARGS(sigreturn, "%p"), (void *)args->sfp);
677 * The trampoline code hands us the sigframe.
678 * It is unsafe to keep track of it ourselves, in the event that a
679 * program jumps out of a signal handler.
681 if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
685 * Check for security violations.
687 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
688 eflags = frame.sf_sc.sc_eflags;
689 if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
693 * Don't allow users to load a valid privileged %cs. Let the
694 * hardware check for invalid selectors, excess privilege in
695 * other selectors, invalid %eip's and invalid %esp's.
697 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
698 if (!CS_SECURE(frame.sf_sc.sc_cs)) {
699 ksiginfo_init_trap(&ksi);
700 ksi.ksi_signo = SIGBUS;
701 ksi.ksi_code = BUS_OBJERR;
702 ksi.ksi_trapno = T_PROTFLT;
703 ksi.ksi_addr = (void *)regs->tf_eip;
704 trapsignal(td, &ksi);
708 lmask.__bits[0] = frame.sf_sc.sc_mask;
709 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++)
710 lmask.__bits[i+1] = frame.sf_extramask[i];
711 linux_to_bsd_sigset(&lmask, &bmask);
712 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
715 * Restore signal context.
717 /* %gs was restored by the trampoline. */
718 regs->tf_fs = frame.sf_sc.sc_fs;
719 regs->tf_es = frame.sf_sc.sc_es;
720 regs->tf_ds = frame.sf_sc.sc_ds;
721 regs->tf_edi = frame.sf_sc.sc_edi;
722 regs->tf_esi = frame.sf_sc.sc_esi;
723 regs->tf_ebp = frame.sf_sc.sc_ebp;
724 regs->tf_ebx = frame.sf_sc.sc_ebx;
725 regs->tf_edx = frame.sf_sc.sc_edx;
726 regs->tf_ecx = frame.sf_sc.sc_ecx;
727 regs->tf_eax = frame.sf_sc.sc_eax;
728 regs->tf_eip = frame.sf_sc.sc_eip;
729 regs->tf_cs = frame.sf_sc.sc_cs;
730 regs->tf_eflags = eflags;
731 regs->tf_esp = frame.sf_sc.sc_esp_at_signal;
732 regs->tf_ss = frame.sf_sc.sc_ss;
734 return (EJUSTRETURN);
738 * System call to cleanup state after a signal
739 * has been taken. Reset signal mask and
740 * stack state from context left by rt_sendsig (above).
741 * Return to previous pc and psl as specified by
742 * context left by sendsig. Check carefully to
743 * make sure that the user has not modified the
744 * psl to gain improper privileges or to cause
748 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
750 struct l_ucontext uc;
751 struct l_sigcontext *context;
755 struct trapframe *regs;
762 if (ldebug(rt_sigreturn))
763 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp);
766 * The trampoline code hands us the ucontext.
767 * It is unsafe to keep track of it ourselves, in the event that a
768 * program jumps out of a signal handler.
770 if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
773 context = &uc.uc_mcontext;
776 * Check for security violations.
778 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
779 eflags = context->sc_eflags;
780 if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
784 * Don't allow users to load a valid privileged %cs. Let the
785 * hardware check for invalid selectors, excess privilege in
786 * other selectors, invalid %eip's and invalid %esp's.
788 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
789 if (!CS_SECURE(context->sc_cs)) {
790 ksiginfo_init_trap(&ksi);
791 ksi.ksi_signo = SIGBUS;
792 ksi.ksi_code = BUS_OBJERR;
793 ksi.ksi_trapno = T_PROTFLT;
794 ksi.ksi_addr = (void *)regs->tf_eip;
795 trapsignal(td, &ksi);
799 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
800 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
803 * Restore signal context
805 /* %gs was restored by the trampoline. */
806 regs->tf_fs = context->sc_fs;
807 regs->tf_es = context->sc_es;
808 regs->tf_ds = context->sc_ds;
809 regs->tf_edi = context->sc_edi;
810 regs->tf_esi = context->sc_esi;
811 regs->tf_ebp = context->sc_ebp;
812 regs->tf_ebx = context->sc_ebx;
813 regs->tf_edx = context->sc_edx;
814 regs->tf_ecx = context->sc_ecx;
815 regs->tf_eax = context->sc_eax;
816 regs->tf_eip = context->sc_eip;
817 regs->tf_cs = context->sc_cs;
818 regs->tf_eflags = eflags;
819 regs->tf_esp = context->sc_esp_at_signal;
820 regs->tf_ss = context->sc_ss;
823 * call sigaltstack & ignore results..
826 ss.ss_sp = lss->ss_sp;
827 ss.ss_size = lss->ss_size;
828 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
831 if (ldebug(rt_sigreturn))
832 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"),
833 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask);
835 (void)kern_sigaltstack(td, &ss, NULL);
837 return (EJUSTRETURN);
841 linux_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
844 struct trapframe *frame;
847 frame = td->td_frame;
849 sa->code = frame->tf_eax;
850 sa->args[0] = frame->tf_ebx;
851 sa->args[1] = frame->tf_ecx;
852 sa->args[2] = frame->tf_edx;
853 sa->args[3] = frame->tf_esi;
854 sa->args[4] = frame->tf_edi;
855 sa->args[5] = frame->tf_ebp; /* Unconfirmed */
857 if (sa->code >= p->p_sysent->sv_size)
858 sa->callp = &p->p_sysent->sv_table[0];
860 sa->callp = &p->p_sysent->sv_table[sa->code];
861 sa->narg = sa->callp->sy_narg;
863 td->td_retval[0] = 0;
864 td->td_retval[1] = frame->tf_edx;
870 * If a linux binary is exec'ing something, try this image activator
871 * first. We override standard shell script execution in order to
872 * be able to modify the interpreter path. We only do this if a linux
873 * binary is doing the exec, so we do not create an EXEC module for it.
875 static int exec_linux_imgact_try(struct image_params *iparams);
878 exec_linux_imgact_try(struct image_params *imgp)
880 const char *head = (const char *)imgp->image_header;
885 * The interpreter for shell scripts run from a linux binary needs
886 * to be located in /compat/linux if possible in order to recursively
887 * maintain linux path emulation.
889 if (((const short *)head)[0] == SHELLMAGIC) {
891 * Run our normal shell image activator. If it succeeds attempt
892 * to use the alternate path for the interpreter. If an alternate
893 * path is found, use our stringspace to store it.
895 if ((error = exec_shell_imgact(imgp)) == 0) {
896 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc),
897 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD);
899 imgp->args->fname_buf =
900 imgp->interpreter_name = rpath;
907 * exec_setregs may initialize some registers differently than Linux
908 * does, thus potentially confusing Linux binaries. If necessary, we
909 * override the exec_setregs default(s) here.
912 exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack)
914 struct pcb *pcb = td->td_pcb;
916 exec_setregs(td, imgp, stack);
918 /* Linux sets %gs to 0, we default to _udatasel */
922 pcb->pcb_initial_npxcw = __LINUX_NPXCW__;
926 linux_get_machine(const char **dst)
944 struct sysentvec linux_sysvec = {
945 .sv_size = LINUX_SYS_MAXSYSCALL,
946 .sv_table = linux_sysent,
948 .sv_sigsize = LINUX_SIGTBLSZ,
949 .sv_sigtbl = bsd_to_linux_signal,
950 .sv_errsize = ELAST + 1,
951 .sv_errtbl = bsd_to_linux_errno,
952 .sv_transtrap = translate_traps,
953 .sv_fixup = linux_fixup,
954 .sv_sendsig = linux_sendsig,
955 .sv_sigcode = linux_sigcode,
956 .sv_szsigcode = &linux_szsigcode,
957 .sv_prepsyscall = NULL,
958 .sv_name = "Linux a.out",
960 .sv_imgact_try = exec_linux_imgact_try,
961 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
962 .sv_pagesize = PAGE_SIZE,
963 .sv_minuser = VM_MIN_ADDRESS,
964 .sv_maxuser = VM_MAXUSER_ADDRESS,
965 .sv_usrstack = LINUX_USRSTACK,
966 .sv_psstrings = PS_STRINGS,
967 .sv_stackprot = VM_PROT_ALL,
968 .sv_copyout_strings = exec_copyout_strings,
969 .sv_setregs = exec_linux_setregs,
972 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32,
973 .sv_set_syscall_retval = cpu_set_syscall_retval,
974 .sv_fetch_syscall_args = linux_fetch_syscall_args,
975 .sv_syscallnames = NULL,
976 .sv_shared_page_base = LINUX_SHAREDPAGE,
977 .sv_shared_page_len = PAGE_SIZE,
978 .sv_schedtail = linux_schedtail,
980 INIT_SYSENTVEC(aout_sysvec, &linux_sysvec);
982 struct sysentvec elf_linux_sysvec = {
983 .sv_size = LINUX_SYS_MAXSYSCALL,
984 .sv_table = linux_sysent,
986 .sv_sigsize = LINUX_SIGTBLSZ,
987 .sv_sigtbl = bsd_to_linux_signal,
988 .sv_errsize = ELAST + 1,
989 .sv_errtbl = bsd_to_linux_errno,
990 .sv_transtrap = translate_traps,
991 .sv_fixup = elf_linux_fixup,
992 .sv_sendsig = linux_sendsig,
993 .sv_sigcode = linux_sigcode,
994 .sv_szsigcode = &linux_szsigcode,
995 .sv_prepsyscall = NULL,
996 .sv_name = "Linux ELF",
997 .sv_coredump = elf32_coredump,
998 .sv_imgact_try = exec_linux_imgact_try,
999 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
1000 .sv_pagesize = PAGE_SIZE,
1001 .sv_minuser = VM_MIN_ADDRESS,
1002 .sv_maxuser = VM_MAXUSER_ADDRESS,
1003 .sv_usrstack = LINUX_USRSTACK,
1004 .sv_psstrings = LINUX_PS_STRINGS,
1005 .sv_stackprot = VM_PROT_ALL,
1006 .sv_copyout_strings = linux_copyout_strings,
1007 .sv_setregs = exec_linux_setregs,
1008 .sv_fixlimit = NULL,
1010 .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP,
1011 .sv_set_syscall_retval = cpu_set_syscall_retval,
1012 .sv_fetch_syscall_args = linux_fetch_syscall_args,
1013 .sv_syscallnames = NULL,
1014 .sv_shared_page_base = LINUX_SHAREDPAGE,
1015 .sv_shared_page_len = PAGE_SIZE,
1016 .sv_schedtail = linux_schedtail,
1018 INIT_SYSENTVEC(elf_sysvec, &elf_linux_sysvec);
1020 static char GNU_ABI_VENDOR[] = "GNU";
1021 static int GNULINUX_ABI_DESC = 0;
1024 linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
1026 const Elf32_Word *desc;
1029 p = (uintptr_t)(note + 1);
1030 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
1032 desc = (const Elf32_Word *)p;
1033 if (desc[0] != GNULINUX_ABI_DESC)
1037 * For linux we encode osrel as follows (see linux_mib.c):
1038 * VVVMMMIII (version, major, minor), see linux_mib.c.
1040 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3];
1045 static Elf_Brandnote linux_brandnote = {
1046 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
1047 .hdr.n_descsz = 16, /* XXX at least 16 */
1049 .vendor = GNU_ABI_VENDOR,
1050 .flags = BN_TRANSLATE_OSREL,
1051 .trans_osrel = linux_trans_osrel
1054 static Elf32_Brandinfo linux_brand = {
1055 .brand = ELFOSABI_LINUX,
1057 .compat_3_brand = "Linux",
1058 .emul_path = "/compat/linux",
1059 .interp_path = "/lib/ld-linux.so.1",
1060 .sysvec = &elf_linux_sysvec,
1061 .interp_newpath = NULL,
1062 .brand_note = &linux_brandnote,
1063 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
1066 static Elf32_Brandinfo linux_glibc2brand = {
1067 .brand = ELFOSABI_LINUX,
1069 .compat_3_brand = "Linux",
1070 .emul_path = "/compat/linux",
1071 .interp_path = "/lib/ld-linux.so.2",
1072 .sysvec = &elf_linux_sysvec,
1073 .interp_newpath = NULL,
1074 .brand_note = &linux_brandnote,
1075 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
1078 Elf32_Brandinfo *linux_brandlist[] = {
1085 linux_elf_modevent(module_t mod, int type, void *data)
1087 Elf32_Brandinfo **brandinfo;
1089 struct linux_ioctl_handler **lihp;
1090 struct linux_device_handler **ldhp;
1096 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
1098 if (elf32_insert_brand_entry(*brandinfo) < 0)
1101 SET_FOREACH(lihp, linux_ioctl_handler_set)
1102 linux_ioctl_register_handler(*lihp);
1103 SET_FOREACH(ldhp, linux_device_handler_set)
1104 linux_device_register_handler(*ldhp);
1105 mtx_init(&emul_lock, "emuldata lock", NULL, MTX_DEF);
1106 sx_init(&emul_shared_lock, "emuldata->shared lock");
1107 LIST_INIT(&futex_list);
1108 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF);
1109 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit,
1111 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec,
1113 linux_get_machine(&linux_platform);
1114 linux_szplatform = roundup(strlen(linux_platform) + 1,
1116 linux_osd_jail_register();
1117 stclohz = (stathz ? stathz : hz);
1119 printf("Linux ELF exec handler installed\n");
1121 printf("cannot insert Linux ELF brand handler\n");
1124 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
1126 if (elf32_brand_inuse(*brandinfo))
1129 for (brandinfo = &linux_brandlist[0];
1130 *brandinfo != NULL; ++brandinfo)
1131 if (elf32_remove_brand_entry(*brandinfo) < 0)
1135 SET_FOREACH(lihp, linux_ioctl_handler_set)
1136 linux_ioctl_unregister_handler(*lihp);
1137 SET_FOREACH(ldhp, linux_device_handler_set)
1138 linux_device_unregister_handler(*ldhp);
1139 mtx_destroy(&emul_lock);
1140 sx_destroy(&emul_shared_lock);
1141 mtx_destroy(&futex_mtx);
1142 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag);
1143 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag);
1144 linux_osd_jail_deregister();
1146 printf("Linux ELF exec handler removed\n");
1148 printf("Could not deinstall ELF interpreter entry\n");
1156 static moduledata_t linux_elf_mod = {
1162 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);