2 * Copyright (c) 2004 Tim J. Robbins
3 * Copyright (c) 2003 Peter Wemm
4 * Copyright (c) 2002 Doug Rabson
5 * Copyright (c) 1998-1999 Andrew Gallatin
6 * Copyright (c) 1994-1996 Søren Schmidt
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer
14 * in this position and unchanged.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 #include "opt_compat.h"
37 #ifndef COMPAT_FREEBSD32
38 #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!"
41 #define __ELF_WORD_SIZE 32
43 #include <sys/param.h>
44 #include <sys/systm.h>
46 #include <sys/fcntl.h>
47 #include <sys/imgact.h>
48 #include <sys/imgact_elf.h>
49 #include <sys/kernel.h>
51 #include <sys/malloc.h>
52 #include <sys/module.h>
53 #include <sys/mutex.h>
55 #include <sys/resourcevar.h>
56 #include <sys/signalvar.h>
57 #include <sys/sysctl.h>
58 #include <sys/syscallsubr.h>
59 #include <sys/sysent.h>
60 #include <sys/sysproto.h>
61 #include <sys/vnode.h>
62 #include <sys/eventhandler.h>
66 #include <vm/vm_extern.h>
67 #include <vm/vm_map.h>
68 #include <vm/vm_object.h>
69 #include <vm/vm_page.h>
70 #include <vm/vm_param.h>
72 #include <machine/cpu.h>
73 #include <machine/md_var.h>
74 #include <machine/pcb.h>
75 #include <machine/specialreg.h>
77 #include <amd64/linux32/linux.h>
78 #include <amd64/linux32/linux32_proto.h>
79 #include <compat/linux/linux_emul.h>
80 #include <compat/linux/linux_futex.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_util.h>
86 MODULE_VERSION(linux, 1);
88 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
90 #define AUXARGS_ENTRY_32(pos, id, val) \
92 suword32(pos++, id); \
93 suword32(pos++, val); \
96 #if BYTE_ORDER == LITTLE_ENDIAN
97 #define SHELLMAGIC 0x2123 /* #! */
99 #define SHELLMAGIC 0x2321
103 * Allow the sendsig functions to use the ldebug() facility
104 * even though they are not syscalls themselves. Map them
105 * to syscall 0. This is slightly less bogus than using
108 #define LINUX_SYS_linux_rt_sendsig 0
109 #define LINUX_SYS_linux_sendsig 0
111 const char *linux_platform = "i686";
112 static int linux_szplatform;
113 extern char linux_sigcode[];
114 extern int linux_szsigcode;
116 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
118 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
119 SET_DECLARE(linux_device_handler_set, struct linux_device_handler);
121 static int elf_linux_fixup(register_t **stack_base,
122 struct image_params *iparams);
123 static register_t *linux_copyout_strings(struct image_params *imgp);
124 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
125 static void exec_linux_setregs(struct thread *td,
126 struct image_params *imgp, u_long stack);
127 static void linux32_fixlimit(struct rlimit *rl, int which);
128 static boolean_t linux32_trans_osrel(const Elf_Note *note, int32_t *osrel);
130 static eventhandler_tag linux_exit_tag;
131 static eventhandler_tag linux_exec_tag;
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 int bsd_to_linux_signal[LINUX_SIGTBLSZ] = {
154 LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL,
155 LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE,
156 LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, LINUX_SIGSYS,
157 LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG,
158 LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD,
159 LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU,
160 LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH,
161 0, LINUX_SIGUSR1, LINUX_SIGUSR2
164 int linux_to_bsd_signal[LINUX_SIGTBLSZ] = {
165 SIGHUP, SIGINT, SIGQUIT, SIGILL,
166 SIGTRAP, SIGABRT, SIGBUS, SIGFPE,
167 SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2,
168 SIGPIPE, SIGALRM, SIGTERM, SIGBUS,
169 SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP,
170 SIGTTIN, SIGTTOU, SIGURG, SIGXCPU,
171 SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH,
172 SIGIO, SIGURG, SIGSYS
175 #define LINUX_T_UNKNOWN 255
176 static int _bsd_to_linux_trapcode[] = {
177 LINUX_T_UNKNOWN, /* 0 */
178 6, /* 1 T_PRIVINFLT */
179 LINUX_T_UNKNOWN, /* 2 */
181 LINUX_T_UNKNOWN, /* 4 */
182 LINUX_T_UNKNOWN, /* 5 */
183 16, /* 6 T_ARITHTRAP */
184 254, /* 7 T_ASTFLT */
185 LINUX_T_UNKNOWN, /* 8 */
186 13, /* 9 T_PROTFLT */
187 1, /* 10 T_TRCTRAP */
188 LINUX_T_UNKNOWN, /* 11 */
189 14, /* 12 T_PAGEFLT */
190 LINUX_T_UNKNOWN, /* 13 */
191 17, /* 14 T_ALIGNFLT */
192 LINUX_T_UNKNOWN, /* 15 */
193 LINUX_T_UNKNOWN, /* 16 */
194 LINUX_T_UNKNOWN, /* 17 */
200 8, /* 23 T_DOUBLEFLT */
201 9, /* 24 T_FPOPFLT */
202 10, /* 25 T_TSSFLT */
203 11, /* 26 T_SEGNPFLT */
204 12, /* 27 T_STKFLT */
206 19, /* 29 T_XMMFLT */
207 15 /* 30 T_RESERVED */
209 #define bsd_to_linux_trapcode(code) \
210 ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \
211 _bsd_to_linux_trapcode[(code)]: \
214 struct linux32_ps_strings {
215 u_int32_t ps_argvstr; /* first of 0 or more argument strings */
216 u_int ps_nargvstr; /* the number of argument strings */
217 u_int32_t ps_envstr; /* first of 0 or more environment strings */
218 u_int ps_nenvstr; /* the number of environment strings */
222 * If FreeBSD & Linux have a difference of opinion about what a trap
223 * means, deal with it here.
228 translate_traps(int signal, int trap_code)
230 if (signal != SIGBUS)
244 elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
248 Elf32_Addr *pos, *uplatform;
249 struct linux32_ps_strings *arginfo;
252 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS;
253 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform);
255 KASSERT(curthread->td_proc == imgp->proc,
256 ("unsafe elf_linux_fixup(), should be curproc"));
257 base = (Elf32_Addr *)*stack_base;
258 args = (Elf32_Auxargs *)imgp->auxargs;
259 pos = base + (imgp->args->argc + imgp->args->envc + 2);
261 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
262 AUXARGS_ENTRY_32(pos, LINUX_AT_HWCAP, cpu_feature);
265 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
266 * as it has appeared in the 2.4.0-rc7 first time.
267 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
268 * glibc falls back to the hard-coded CLK_TCK value when aux entry
270 * Also see linux_times() implementation.
272 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
273 AUXARGS_ENTRY_32(pos, LINUX_AT_CLKTCK, stclohz);
274 AUXARGS_ENTRY_32(pos, AT_PHDR, args->phdr);
275 AUXARGS_ENTRY_32(pos, AT_PHENT, args->phent);
276 AUXARGS_ENTRY_32(pos, AT_PHNUM, args->phnum);
277 AUXARGS_ENTRY_32(pos, AT_PAGESZ, args->pagesz);
278 AUXARGS_ENTRY_32(pos, AT_FLAGS, args->flags);
279 AUXARGS_ENTRY_32(pos, AT_ENTRY, args->entry);
280 AUXARGS_ENTRY_32(pos, AT_BASE, args->base);
281 AUXARGS_ENTRY_32(pos, LINUX_AT_SECURE, issetugid);
282 AUXARGS_ENTRY_32(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
283 AUXARGS_ENTRY_32(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
284 AUXARGS_ENTRY_32(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
285 AUXARGS_ENTRY_32(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
286 AUXARGS_ENTRY_32(pos, LINUX_AT_PLATFORM, PTROUT(uplatform));
287 if (args->execfd != -1)
288 AUXARGS_ENTRY_32(pos, AT_EXECFD, args->execfd);
289 AUXARGS_ENTRY_32(pos, AT_NULL, 0);
291 free(imgp->auxargs, M_TEMP);
292 imgp->auxargs = NULL;
295 suword32(base, (uint32_t)imgp->args->argc);
296 *stack_base = (register_t *)base;
300 extern unsigned long linux_sznonrtsigcode;
303 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
305 struct thread *td = curthread;
306 struct proc *p = td->td_proc;
308 struct trapframe *regs;
309 struct l_rt_sigframe *fp, frame;
314 sig = ksi->ksi_signo;
315 code = ksi->ksi_code;
316 PROC_LOCK_ASSERT(p, MA_OWNED);
318 mtx_assert(&psp->ps_mtx, MA_OWNED);
320 oonstack = sigonstack(regs->tf_rsp);
323 if (ldebug(rt_sendsig))
324 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"),
325 catcher, sig, (void*)mask, code);
328 * Allocate space for the signal handler context.
330 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
331 SIGISMEMBER(psp->ps_sigonstack, sig)) {
332 fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp +
333 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
335 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1;
336 mtx_unlock(&psp->ps_mtx);
339 * Build the argument list for the signal handler.
341 if (p->p_sysent->sv_sigtbl)
342 if (sig <= p->p_sysent->sv_sigsize)
343 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
345 bzero(&frame, sizeof(frame));
347 frame.sf_handler = PTROUT(catcher);
349 frame.sf_siginfo = PTROUT(&fp->sf_si);
350 frame.sf_ucontext = PTROUT(&fp->sf_sc);
352 /* Fill in POSIX parts */
353 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig);
356 * Build the signal context to be used by sigreturn.
358 frame.sf_sc.uc_flags = 0; /* XXX ??? */
359 frame.sf_sc.uc_link = 0; /* XXX ??? */
361 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
362 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
363 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
364 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
367 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
369 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0];
370 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi;
371 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi;
372 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp;
373 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx;
374 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx;
375 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx;
376 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax;
377 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip;
378 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
379 frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs;
380 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs;
381 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es;
382 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds;
383 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags;
384 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp;
385 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss;
386 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err;
387 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr;
388 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
391 if (ldebug(rt_sendsig))
392 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"),
393 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp,
394 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask);
397 if (copyout(&frame, fp, sizeof(frame)) != 0) {
399 * Process has trashed its stack; give it an illegal
400 * instruction to halt it in its tracks.
403 if (ldebug(rt_sendsig))
404 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"),
412 * Build context to run handler in.
414 regs->tf_rsp = PTROUT(fp);
415 regs->tf_rip = p->p_sysent->sv_sigcode_base + linux_sznonrtsigcode;
416 regs->tf_rflags &= ~(PSL_T | PSL_D);
417 regs->tf_cs = _ucode32sel;
418 regs->tf_ss = _udatasel;
419 regs->tf_ds = _udatasel;
420 regs->tf_es = _udatasel;
421 regs->tf_fs = _ufssel;
422 regs->tf_gs = _ugssel;
423 regs->tf_flags = TF_HASSEGS;
424 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
426 mtx_lock(&psp->ps_mtx);
431 * Send an interrupt to process.
433 * Stack is set up to allow sigcode stored
434 * in u. to call routine, followed by kcall
435 * to sigreturn routine below. After sigreturn
436 * resets the signal mask, the stack, and the
437 * frame pointer, it returns to the user
441 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
443 struct thread *td = curthread;
444 struct proc *p = td->td_proc;
446 struct trapframe *regs;
447 struct l_sigframe *fp, frame;
452 sig = ksi->ksi_signo;
453 code = ksi->ksi_code;
454 PROC_LOCK_ASSERT(p, MA_OWNED);
456 mtx_assert(&psp->ps_mtx, MA_OWNED);
457 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
458 /* Signal handler installed with SA_SIGINFO. */
459 linux_rt_sendsig(catcher, ksi, mask);
464 oonstack = sigonstack(regs->tf_rsp);
468 printf(ARGS(sendsig, "%p, %d, %p, %u"),
469 catcher, sig, (void*)mask, code);
473 * Allocate space for the signal handler context.
475 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
476 SIGISMEMBER(psp->ps_sigonstack, sig)) {
477 fp = (struct l_sigframe *)(td->td_sigstk.ss_sp +
478 td->td_sigstk.ss_size - sizeof(struct l_sigframe));
480 fp = (struct l_sigframe *)regs->tf_rsp - 1;
481 mtx_unlock(&psp->ps_mtx);
485 * Build the argument list for the signal handler.
487 if (p->p_sysent->sv_sigtbl)
488 if (sig <= p->p_sysent->sv_sigsize)
489 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
491 bzero(&frame, sizeof(frame));
493 frame.sf_handler = PTROUT(catcher);
496 bsd_to_linux_sigset(mask, &lmask);
499 * Build the signal context to be used by sigreturn.
501 frame.sf_sc.sc_mask = lmask.__bits[0];
502 frame.sf_sc.sc_gs = regs->tf_gs;
503 frame.sf_sc.sc_fs = regs->tf_fs;
504 frame.sf_sc.sc_es = regs->tf_es;
505 frame.sf_sc.sc_ds = regs->tf_ds;
506 frame.sf_sc.sc_edi = regs->tf_rdi;
507 frame.sf_sc.sc_esi = regs->tf_rsi;
508 frame.sf_sc.sc_ebp = regs->tf_rbp;
509 frame.sf_sc.sc_ebx = regs->tf_rbx;
510 frame.sf_sc.sc_edx = regs->tf_rdx;
511 frame.sf_sc.sc_ecx = regs->tf_rcx;
512 frame.sf_sc.sc_eax = regs->tf_rax;
513 frame.sf_sc.sc_eip = regs->tf_rip;
514 frame.sf_sc.sc_cs = regs->tf_cs;
515 frame.sf_sc.sc_eflags = regs->tf_rflags;
516 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp;
517 frame.sf_sc.sc_ss = regs->tf_ss;
518 frame.sf_sc.sc_err = regs->tf_err;
519 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr;
520 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code);
522 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++)
523 frame.sf_extramask[i] = lmask.__bits[i+1];
525 if (copyout(&frame, fp, sizeof(frame)) != 0) {
527 * Process has trashed its stack; give it an illegal
528 * instruction to halt it in its tracks.
535 * Build context to run handler in.
537 regs->tf_rsp = PTROUT(fp);
538 regs->tf_rip = p->p_sysent->sv_sigcode_base;
539 regs->tf_rflags &= ~(PSL_T | PSL_D);
540 regs->tf_cs = _ucode32sel;
541 regs->tf_ss = _udatasel;
542 regs->tf_ds = _udatasel;
543 regs->tf_es = _udatasel;
544 regs->tf_fs = _ufssel;
545 regs->tf_gs = _ugssel;
546 regs->tf_flags = TF_HASSEGS;
547 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
549 mtx_lock(&psp->ps_mtx);
553 * System call to cleanup state after a signal
554 * has been taken. Reset signal mask and
555 * stack state from context left by sendsig (above).
556 * Return to previous pc and psl as specified by
557 * context left by sendsig. Check carefully to
558 * make sure that the user has not modified the
559 * psl to gain improper privileges or to cause
563 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
565 struct l_sigframe frame;
566 struct trapframe *regs;
575 if (ldebug(sigreturn))
576 printf(ARGS(sigreturn, "%p"), (void *)args->sfp);
579 * The trampoline code hands us the sigframe.
580 * It is unsafe to keep track of it ourselves, in the event that a
581 * program jumps out of a signal handler.
583 if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
587 * Check for security violations.
589 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
590 eflags = frame.sf_sc.sc_eflags;
591 if (!EFLAGS_SECURE(eflags, regs->tf_rflags))
595 * Don't allow users to load a valid privileged %cs. Let the
596 * hardware check for invalid selectors, excess privilege in
597 * other selectors, invalid %eip's and invalid %esp's.
599 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
600 if (!CS_SECURE(frame.sf_sc.sc_cs)) {
601 ksiginfo_init_trap(&ksi);
602 ksi.ksi_signo = SIGBUS;
603 ksi.ksi_code = BUS_OBJERR;
604 ksi.ksi_trapno = T_PROTFLT;
605 ksi.ksi_addr = (void *)regs->tf_rip;
606 trapsignal(td, &ksi);
610 lmask.__bits[0] = frame.sf_sc.sc_mask;
611 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++)
612 lmask.__bits[i+1] = frame.sf_extramask[i];
613 linux_to_bsd_sigset(&lmask, &bmask);
614 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
617 * Restore signal context.
619 regs->tf_rdi = frame.sf_sc.sc_edi;
620 regs->tf_rsi = frame.sf_sc.sc_esi;
621 regs->tf_rbp = frame.sf_sc.sc_ebp;
622 regs->tf_rbx = frame.sf_sc.sc_ebx;
623 regs->tf_rdx = frame.sf_sc.sc_edx;
624 regs->tf_rcx = frame.sf_sc.sc_ecx;
625 regs->tf_rax = frame.sf_sc.sc_eax;
626 regs->tf_rip = frame.sf_sc.sc_eip;
627 regs->tf_cs = frame.sf_sc.sc_cs;
628 regs->tf_ds = frame.sf_sc.sc_ds;
629 regs->tf_es = frame.sf_sc.sc_es;
630 regs->tf_fs = frame.sf_sc.sc_fs;
631 regs->tf_gs = frame.sf_sc.sc_gs;
632 regs->tf_rflags = eflags;
633 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal;
634 regs->tf_ss = frame.sf_sc.sc_ss;
635 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
637 return (EJUSTRETURN);
641 * System call to cleanup state after a signal
642 * has been taken. Reset signal mask and
643 * stack state from context left by rt_sendsig (above).
644 * Return to previous pc and psl as specified by
645 * context left by sendsig. Check carefully to
646 * make sure that the user has not modified the
647 * psl to gain improper privileges or to cause
651 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
653 struct l_ucontext uc;
654 struct l_sigcontext *context;
658 struct trapframe *regs;
665 if (ldebug(rt_sigreturn))
666 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp);
669 * The trampoline code hands us the ucontext.
670 * It is unsafe to keep track of it ourselves, in the event that a
671 * program jumps out of a signal handler.
673 if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
676 context = &uc.uc_mcontext;
679 * Check for security violations.
681 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
682 eflags = context->sc_eflags;
683 if (!EFLAGS_SECURE(eflags, regs->tf_rflags))
687 * Don't allow users to load a valid privileged %cs. Let the
688 * hardware check for invalid selectors, excess privilege in
689 * other selectors, invalid %eip's and invalid %esp's.
691 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
692 if (!CS_SECURE(context->sc_cs)) {
693 ksiginfo_init_trap(&ksi);
694 ksi.ksi_signo = SIGBUS;
695 ksi.ksi_code = BUS_OBJERR;
696 ksi.ksi_trapno = T_PROTFLT;
697 ksi.ksi_addr = (void *)regs->tf_rip;
698 trapsignal(td, &ksi);
702 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
703 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
706 * Restore signal context
708 regs->tf_gs = context->sc_gs;
709 regs->tf_fs = context->sc_fs;
710 regs->tf_es = context->sc_es;
711 regs->tf_ds = context->sc_ds;
712 regs->tf_rdi = context->sc_edi;
713 regs->tf_rsi = context->sc_esi;
714 regs->tf_rbp = context->sc_ebp;
715 regs->tf_rbx = context->sc_ebx;
716 regs->tf_rdx = context->sc_edx;
717 regs->tf_rcx = context->sc_ecx;
718 regs->tf_rax = context->sc_eax;
719 regs->tf_rip = context->sc_eip;
720 regs->tf_cs = context->sc_cs;
721 regs->tf_rflags = eflags;
722 regs->tf_rsp = context->sc_esp_at_signal;
723 regs->tf_ss = context->sc_ss;
724 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
727 * call sigaltstack & ignore results..
730 ss.ss_sp = PTRIN(lss->ss_sp);
731 ss.ss_size = lss->ss_size;
732 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
735 if (ldebug(rt_sigreturn))
736 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"),
737 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask);
739 (void)kern_sigaltstack(td, &ss, NULL);
741 return (EJUSTRETURN);
745 linux32_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
748 struct trapframe *frame;
751 frame = td->td_frame;
753 sa->args[0] = frame->tf_rbx;
754 sa->args[1] = frame->tf_rcx;
755 sa->args[2] = frame->tf_rdx;
756 sa->args[3] = frame->tf_rsi;
757 sa->args[4] = frame->tf_rdi;
758 sa->args[5] = frame->tf_rbp; /* Unconfirmed */
759 sa->code = frame->tf_rax;
761 if (sa->code >= p->p_sysent->sv_size)
762 sa->callp = &p->p_sysent->sv_table[0];
764 sa->callp = &p->p_sysent->sv_table[sa->code];
765 sa->narg = sa->callp->sy_narg;
767 td->td_retval[0] = 0;
768 td->td_retval[1] = frame->tf_rdx;
774 * If a linux binary is exec'ing something, try this image activator
775 * first. We override standard shell script execution in order to
776 * be able to modify the interpreter path. We only do this if a linux
777 * binary is doing the exec, so we do not create an EXEC module for it.
779 static int exec_linux_imgact_try(struct image_params *iparams);
782 exec_linux_imgact_try(struct image_params *imgp)
784 const char *head = (const char *)imgp->image_header;
789 * The interpreter for shell scripts run from a linux binary needs
790 * to be located in /compat/linux if possible in order to recursively
791 * maintain linux path emulation.
793 if (((const short *)head)[0] == SHELLMAGIC) {
795 * Run our normal shell image activator. If it succeeds attempt
796 * to use the alternate path for the interpreter. If an
797 * alternate * path is found, use our stringspace to store it.
799 if ((error = exec_shell_imgact(imgp)) == 0) {
800 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc),
801 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0,
804 imgp->args->fname_buf =
805 imgp->interpreter_name = rpath;
812 * Clear registers on exec
813 * XXX copied from ia32_signal.c.
816 exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack)
818 struct trapframe *regs = td->td_frame;
819 struct pcb *pcb = td->td_pcb;
822 if (td->td_proc->p_md.md_ldt != NULL)
825 mtx_unlock(&dt_lock);
828 wrmsr(MSR_FSBASE, 0);
829 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */
833 pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
835 bzero((char *)regs, sizeof(struct trapframe));
836 regs->tf_rip = imgp->entry_addr;
837 regs->tf_rsp = stack;
838 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
839 regs->tf_gs = _ugssel;
840 regs->tf_fs = _ufssel;
841 regs->tf_es = _udatasel;
842 regs->tf_ds = _udatasel;
843 regs->tf_ss = _udatasel;
844 regs->tf_flags = TF_HASSEGS;
845 regs->tf_cs = _ucode32sel;
846 regs->tf_rbx = imgp->ps_strings;
850 /* Do full restore on return so that we can change to a different %cs */
851 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);
852 td->td_retval[1] = 0;
856 * XXX copied from ia32_sysvec.c.
859 linux_copyout_strings(struct image_params *imgp)
863 char *stringp, *destp;
864 u_int32_t *stack_base;
865 struct linux32_ps_strings *arginfo;
868 * Calculate string base and vector table pointers.
869 * Also deal with signal trampoline code for this exec type.
871 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS;
872 destp = (caddr_t)arginfo - SPARE_USRSPACE - linux_szplatform -
873 roundup((ARG_MAX - imgp->args->stringspace),
877 * Install LINUX_PLATFORM
879 copyout(linux_platform, ((caddr_t)arginfo - linux_szplatform),
883 * If we have a valid auxargs ptr, prepare some room
888 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
889 * lower compatibility.
891 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size :
892 (LINUX_AT_COUNT * 2);
894 * The '+ 2' is for the null pointers at the end of each of
895 * the arg and env vector sets,and imgp->auxarg_size is room
896 * for argument of Runtime loader.
898 vectp = (u_int32_t *) (destp - (imgp->args->argc +
899 imgp->args->envc + 2 + imgp->auxarg_size) *
904 * The '+ 2' is for the null pointers at the end of each of
905 * the arg and env vector sets
907 vectp = (u_int32_t *)(destp - (imgp->args->argc +
908 imgp->args->envc + 2) * sizeof(u_int32_t));
911 * vectp also becomes our initial stack base
915 stringp = imgp->args->begin_argv;
916 argc = imgp->args->argc;
917 envc = imgp->args->envc;
919 * Copy out strings - arguments and environment.
921 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
924 * Fill in "ps_strings" struct for ps, w, etc.
926 suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp);
927 suword32(&arginfo->ps_nargvstr, argc);
930 * Fill in argument portion of vector table.
932 for (; argc > 0; --argc) {
933 suword32(vectp++, (uint32_t)(intptr_t)destp);
934 while (*stringp++ != 0)
939 /* a null vector table pointer separates the argp's from the envp's */
940 suword32(vectp++, 0);
942 suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp);
943 suword32(&arginfo->ps_nenvstr, envc);
946 * Fill in environment portion of vector table.
948 for (; envc > 0; --envc) {
949 suword32(vectp++, (uint32_t)(intptr_t)destp);
950 while (*stringp++ != 0)
955 /* end of vector table is a null pointer */
958 return ((register_t *)stack_base);
961 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0,
962 "32-bit Linux emulation");
964 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ;
965 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW,
966 &linux32_maxdsiz, 0, "");
967 static u_long linux32_maxssiz = LINUX32_MAXSSIZ;
968 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW,
969 &linux32_maxssiz, 0, "");
970 static u_long linux32_maxvmem = LINUX32_MAXVMEM;
971 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW,
972 &linux32_maxvmem, 0, "");
975 linux32_fixlimit(struct rlimit *rl, int which)
980 if (linux32_maxdsiz != 0) {
981 if (rl->rlim_cur > linux32_maxdsiz)
982 rl->rlim_cur = linux32_maxdsiz;
983 if (rl->rlim_max > linux32_maxdsiz)
984 rl->rlim_max = linux32_maxdsiz;
988 if (linux32_maxssiz != 0) {
989 if (rl->rlim_cur > linux32_maxssiz)
990 rl->rlim_cur = linux32_maxssiz;
991 if (rl->rlim_max > linux32_maxssiz)
992 rl->rlim_max = linux32_maxssiz;
996 if (linux32_maxvmem != 0) {
997 if (rl->rlim_cur > linux32_maxvmem)
998 rl->rlim_cur = linux32_maxvmem;
999 if (rl->rlim_max > linux32_maxvmem)
1000 rl->rlim_max = linux32_maxvmem;
1006 struct sysentvec elf_linux_sysvec = {
1007 .sv_size = LINUX_SYS_MAXSYSCALL,
1008 .sv_table = linux_sysent,
1010 .sv_sigsize = LINUX_SIGTBLSZ,
1011 .sv_sigtbl = bsd_to_linux_signal,
1012 .sv_errsize = ELAST + 1,
1013 .sv_errtbl = bsd_to_linux_errno,
1014 .sv_transtrap = translate_traps,
1015 .sv_fixup = elf_linux_fixup,
1016 .sv_sendsig = linux_sendsig,
1017 .sv_sigcode = linux_sigcode,
1018 .sv_szsigcode = &linux_szsigcode,
1019 .sv_prepsyscall = NULL,
1020 .sv_name = "Linux ELF32",
1021 .sv_coredump = elf32_coredump,
1022 .sv_imgact_try = exec_linux_imgact_try,
1023 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
1024 .sv_pagesize = PAGE_SIZE,
1025 .sv_minuser = VM_MIN_ADDRESS,
1026 .sv_maxuser = LINUX32_MAXUSER,
1027 .sv_usrstack = LINUX32_USRSTACK,
1028 .sv_psstrings = LINUX32_PS_STRINGS,
1029 .sv_stackprot = VM_PROT_ALL,
1030 .sv_copyout_strings = linux_copyout_strings,
1031 .sv_setregs = exec_linux_setregs,
1032 .sv_fixlimit = linux32_fixlimit,
1033 .sv_maxssiz = &linux32_maxssiz,
1034 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP,
1035 .sv_set_syscall_retval = cpu_set_syscall_retval,
1036 .sv_fetch_syscall_args = linux32_fetch_syscall_args,
1037 .sv_syscallnames = NULL,
1038 .sv_shared_page_base = LINUX32_SHAREDPAGE,
1039 .sv_shared_page_len = PAGE_SIZE,
1040 .sv_schedtail = linux_schedtail,
1042 INIT_SYSENTVEC(elf_sysvec, &elf_linux_sysvec);
1044 static char GNU_ABI_VENDOR[] = "GNU";
1045 static int GNULINUX_ABI_DESC = 0;
1048 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel)
1050 const Elf32_Word *desc;
1053 p = (uintptr_t)(note + 1);
1054 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
1056 desc = (const Elf32_Word *)p;
1057 if (desc[0] != GNULINUX_ABI_DESC)
1061 * For linux we encode osrel as follows (see linux_mib.c):
1062 * VVVMMMIII (version, major, minor), see linux_mib.c.
1064 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3];
1069 static Elf_Brandnote linux32_brandnote = {
1070 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
1071 .hdr.n_descsz = 16, /* XXX at least 16 */
1073 .vendor = GNU_ABI_VENDOR,
1074 .flags = BN_TRANSLATE_OSREL,
1075 .trans_osrel = linux32_trans_osrel
1078 static Elf32_Brandinfo linux_brand = {
1079 .brand = ELFOSABI_LINUX,
1081 .compat_3_brand = "Linux",
1082 .emul_path = "/compat/linux",
1083 .interp_path = "/lib/ld-linux.so.1",
1084 .sysvec = &elf_linux_sysvec,
1085 .interp_newpath = NULL,
1086 .brand_note = &linux32_brandnote,
1087 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
1090 static Elf32_Brandinfo linux_glibc2brand = {
1091 .brand = ELFOSABI_LINUX,
1093 .compat_3_brand = "Linux",
1094 .emul_path = "/compat/linux",
1095 .interp_path = "/lib/ld-linux.so.2",
1096 .sysvec = &elf_linux_sysvec,
1097 .interp_newpath = NULL,
1098 .brand_note = &linux32_brandnote,
1099 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
1102 Elf32_Brandinfo *linux_brandlist[] = {
1109 linux_elf_modevent(module_t mod, int type, void *data)
1111 Elf32_Brandinfo **brandinfo;
1113 struct linux_ioctl_handler **lihp;
1114 struct linux_device_handler **ldhp;
1120 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
1122 if (elf32_insert_brand_entry(*brandinfo) < 0)
1125 SET_FOREACH(lihp, linux_ioctl_handler_set)
1126 linux_ioctl_register_handler(*lihp);
1127 SET_FOREACH(ldhp, linux_device_handler_set)
1128 linux_device_register_handler(*ldhp);
1129 mtx_init(&emul_lock, "emuldata lock", NULL, MTX_DEF);
1130 sx_init(&emul_shared_lock, "emuldata->shared lock");
1131 LIST_INIT(&futex_list);
1132 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF);
1133 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit,
1134 linux_proc_exit, NULL, 1000);
1135 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec,
1136 linux_proc_exec, NULL, 1000);
1137 linux_szplatform = roundup(strlen(linux_platform) + 1,
1139 linux_osd_jail_register();
1140 stclohz = (stathz ? stathz : hz);
1142 printf("Linux ELF exec handler installed\n");
1144 printf("cannot insert Linux ELF brand handler\n");
1147 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
1149 if (elf32_brand_inuse(*brandinfo))
1152 for (brandinfo = &linux_brandlist[0];
1153 *brandinfo != NULL; ++brandinfo)
1154 if (elf32_remove_brand_entry(*brandinfo) < 0)
1158 SET_FOREACH(lihp, linux_ioctl_handler_set)
1159 linux_ioctl_unregister_handler(*lihp);
1160 SET_FOREACH(ldhp, linux_device_handler_set)
1161 linux_device_unregister_handler(*ldhp);
1162 mtx_destroy(&emul_lock);
1163 sx_destroy(&emul_shared_lock);
1164 mtx_destroy(&futex_mtx);
1165 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag);
1166 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag);
1167 linux_osd_jail_deregister();
1169 printf("Linux ELF exec handler removed\n");
1171 printf("Could not deinstall ELF interpreter entry\n");
1179 static moduledata_t linux_elf_mod = {
1185 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);