2 * linux/arch/x86_64/ia32/ia32_signal.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
7 * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
8 * 2000-12-* x86-64 compatibility mode signal handling by Andi Kleen
11 #include <linux/sched.h>
13 #include <linux/smp.h>
14 #include <linux/kernel.h>
15 #include <linux/signal.h>
16 #include <linux/errno.h>
17 #include <linux/wait.h>
18 #include <linux/ptrace.h>
19 #include <linux/unistd.h>
20 #include <linux/stddef.h>
21 #include <linux/personality.h>
22 #include <linux/compat.h>
23 #include <linux/binfmts.h>
24 #include <asm/ucontext.h>
25 #include <asm/uaccess.h>
28 #include <asm/ptrace.h>
29 #include <asm/ia32_unistd.h>
30 #include <asm/user32.h>
31 #include <asm/sigcontext32.h>
32 #include <asm/proto.h>
37 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
39 #define FIX_EFLAGS (X86_EFLAGS_AC | X86_EFLAGS_OF | \
40 X86_EFLAGS_DF | X86_EFLAGS_TF | X86_EFLAGS_SF | \
41 X86_EFLAGS_ZF | X86_EFLAGS_AF | X86_EFLAGS_PF | \
44 asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
45 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
47 int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
51 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
54 /* If you change siginfo_t structure, please make sure that
55 this code is fixed accordingly.
56 It should never copy any pad contained in the structure
57 to avoid security leaks, but must copy the generic
58 3 ints plus the relevant union member. */
59 err = __put_user(from->si_signo, &to->si_signo);
60 err |= __put_user(from->si_errno, &to->si_errno);
61 err |= __put_user((short)from->si_code, &to->si_code);
63 if (from->si_code < 0) {
64 err |= __put_user(from->si_pid, &to->si_pid);
65 err |= __put_user(from->si_uid, &to->si_uid);
66 err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr);
69 * First 32bits of unions are always present:
70 * si_pid === si_band === si_tid === si_addr(LS half)
72 err |= __put_user(from->_sifields._pad[0],
73 &to->_sifields._pad[0]);
74 switch (from->si_code >> 16) {
75 case __SI_FAULT >> 16:
78 err |= __put_user(from->si_utime, &to->si_utime);
79 err |= __put_user(from->si_stime, &to->si_stime);
80 err |= __put_user(from->si_status, &to->si_status);
84 err |= __put_user(from->si_uid, &to->si_uid);
87 err |= __put_user(from->si_fd, &to->si_fd);
89 case __SI_TIMER >> 16:
90 err |= __put_user(from->si_overrun, &to->si_overrun);
91 err |= __put_user(ptr_to_compat(from->si_ptr),
94 /* This is not generated by the kernel as of now. */
96 case __SI_MESGQ >> 16:
97 err |= __put_user(from->si_uid, &to->si_uid);
98 err |= __put_user(from->si_int, &to->si_int);
105 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
110 if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
113 err = __get_user(to->si_signo, &from->si_signo);
114 err |= __get_user(to->si_errno, &from->si_errno);
115 err |= __get_user(to->si_code, &from->si_code);
117 err |= __get_user(to->si_pid, &from->si_pid);
118 err |= __get_user(to->si_uid, &from->si_uid);
119 err |= __get_user(ptr32, &from->si_ptr);
120 to->si_ptr = compat_ptr(ptr32);
125 asmlinkage long sys32_sigsuspend(int history0, int history1, old_sigset_t mask)
128 spin_lock_irq(¤t->sighand->siglock);
129 current->saved_sigmask = current->blocked;
130 siginitset(¤t->blocked, mask);
132 spin_unlock_irq(¤t->sighand->siglock);
134 current->state = TASK_INTERRUPTIBLE;
136 set_restore_sigmask();
137 return -ERESTARTNOHAND;
140 asmlinkage long sys32_sigaltstack(const stack_ia32_t __user *uss_ptr,
141 stack_ia32_t __user *uoss_ptr,
142 struct pt_regs *regs)
151 memset(&uss, 0, sizeof(stack_t));
152 if (!access_ok(VERIFY_READ, uss_ptr, sizeof(stack_ia32_t)) ||
153 __get_user(ptr, &uss_ptr->ss_sp) ||
154 __get_user(uss.ss_flags, &uss_ptr->ss_flags) ||
155 __get_user(uss.ss_size, &uss_ptr->ss_size))
157 uss.ss_sp = compat_ptr(ptr);
161 ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs->sp);
163 if (ret >= 0 && uoss_ptr) {
164 if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(stack_ia32_t)) ||
165 __put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) ||
166 __put_user(uoss.ss_flags, &uoss_ptr->ss_flags) ||
167 __put_user(uoss.ss_size, &uoss_ptr->ss_size))
174 * Do a signal return; undo the signal stack.
181 struct sigcontext_ia32 sc;
182 struct _fpstate_ia32 fpstate_unused; /* look at kernel/sigframe.h */
183 unsigned int extramask[_COMPAT_NSIG_WORDS-1];
185 /* fp state follows here */
194 compat_siginfo_t info;
195 struct ucontext_ia32 uc;
197 /* fp state follows here */
202 err |= __get_user(reg, &sc->x); \
206 #define RELOAD_SEG(seg,mask) \
207 { unsigned int cur; \
208 unsigned short pre; \
209 err |= __get_user(pre, &sc->seg); \
210 asm volatile("movl %%" #seg ",%0" : "=r" (cur)); \
212 if (pre != cur) loadsegment(seg, pre); }
214 static int ia32_restore_sigcontext(struct pt_regs *regs,
215 struct sigcontext_ia32 __user *sc,
218 unsigned int tmpflags, gs, oldgs, err = 0;
219 struct _fpstate_ia32 __user *buf;
222 /* Always make any pending restarted system calls return -EINTR */
223 current_thread_info()->restart_block.fn = do_no_restart_syscall;
226 printk(KERN_DEBUG "SIG restore_sigcontext: "
227 "sc=%p err(%x) eip(%x) cs(%x) flg(%x)\n",
228 sc, sc->err, sc->ip, sc->cs, sc->flags);
232 * Reload fs and gs if they have changed in the signal
233 * handler. This does not handle long fs/gs base changes in
234 * the handler, but does not clobber them at least in the
237 err |= __get_user(gs, &sc->gs);
239 asm("movl %%gs,%0" : "=r" (oldgs));
247 COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
248 COPY(dx); COPY(cx); COPY(ip);
249 /* Don't touch extended registers */
251 err |= __get_user(regs->cs, &sc->cs);
253 err |= __get_user(regs->ss, &sc->ss);
256 err |= __get_user(tmpflags, &sc->flags);
257 regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
258 /* disable syscall checks */
261 err |= __get_user(tmp, &sc->fpstate);
262 buf = compat_ptr(tmp);
264 if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
266 err |= restore_i387_ia32(buf);
268 struct task_struct *me = current;
276 err |= __get_user(tmp, &sc->ax);
285 asmlinkage long sys32_sigreturn(struct pt_regs *regs)
287 struct sigframe __user *frame = (struct sigframe __user *)(regs->sp-8);
291 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
293 if (__get_user(set.sig[0], &frame->sc.oldmask)
294 || (_COMPAT_NSIG_WORDS > 1
295 && __copy_from_user((((char *) &set.sig) + 4),
297 sizeof(frame->extramask))))
300 sigdelsetmask(&set, ~_BLOCKABLE);
301 spin_lock_irq(¤t->sighand->siglock);
302 current->blocked = set;
304 spin_unlock_irq(¤t->sighand->siglock);
306 if (ia32_restore_sigcontext(regs, &frame->sc, &ax))
311 signal_fault(regs, frame, "32bit sigreturn");
315 asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
317 struct rt_sigframe __user *frame;
320 struct pt_regs tregs;
322 frame = (struct rt_sigframe __user *)(regs->sp - 4);
324 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
326 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
329 sigdelsetmask(&set, ~_BLOCKABLE);
330 spin_lock_irq(¤t->sighand->siglock);
331 current->blocked = set;
333 spin_unlock_irq(¤t->sighand->siglock);
335 if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
339 if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT)
345 signal_fault(regs, frame, "32bit rt sigreturn");
350 * Set up a signal frame.
353 static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc,
354 struct _fpstate_ia32 __user *fpstate,
355 struct pt_regs *regs, unsigned int mask)
360 __asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp));
361 err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
362 __asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp));
363 err |= __put_user(tmp, (unsigned int __user *)&sc->fs);
364 __asm__("movl %%ds,%0" : "=r"(tmp): "0"(tmp));
365 err |= __put_user(tmp, (unsigned int __user *)&sc->ds);
366 __asm__("movl %%es,%0" : "=r"(tmp): "0"(tmp));
367 err |= __put_user(tmp, (unsigned int __user *)&sc->es);
369 err |= __put_user((u32)regs->di, &sc->di);
370 err |= __put_user((u32)regs->si, &sc->si);
371 err |= __put_user((u32)regs->bp, &sc->bp);
372 err |= __put_user((u32)regs->sp, &sc->sp);
373 err |= __put_user((u32)regs->bx, &sc->bx);
374 err |= __put_user((u32)regs->dx, &sc->dx);
375 err |= __put_user((u32)regs->cx, &sc->cx);
376 err |= __put_user((u32)regs->ax, &sc->ax);
377 err |= __put_user((u32)regs->cs, &sc->cs);
378 err |= __put_user((u32)regs->ss, &sc->ss);
379 err |= __put_user(current->thread.trap_no, &sc->trapno);
380 err |= __put_user(current->thread.error_code, &sc->err);
381 err |= __put_user((u32)regs->ip, &sc->ip);
382 err |= __put_user((u32)regs->flags, &sc->flags);
383 err |= __put_user((u32)regs->sp, &sc->sp_at_signal);
385 tmp = save_i387_ia32(fpstate);
391 err |= __put_user(ptr_to_compat(tmp ? fpstate : NULL),
395 /* non-iBCS2 extensions.. */
396 err |= __put_user(mask, &sc->oldmask);
397 err |= __put_user(current->thread.cr2, &sc->cr2);
403 * Determine which stack to use..
405 static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
407 struct _fpstate_ia32 **fpstate)
411 /* Default to using normal stack */
414 /* This is the X/Open sanctioned signal stack switching. */
415 if (ka->sa.sa_flags & SA_ONSTACK) {
416 if (sas_ss_flags(sp) == 0)
417 sp = current->sas_ss_sp + current->sas_ss_size;
420 /* This is the legacy signal stack switching. */
421 else if ((regs->ss & 0xffff) != __USER_DS &&
422 !(ka->sa.sa_flags & SA_RESTORER) &&
424 sp = (unsigned long) ka->sa.sa_restorer;
427 sp = sp - sig_xstate_ia32_size;
428 *fpstate = (struct _fpstate_ia32 *) sp;
432 /* Align the stack pointer according to the i386 ABI,
433 * i.e. so that on function entry ((sp + 4) & 15) == 0. */
434 sp = ((sp + 4) & -16ul) - 4;
435 return (void __user *) sp;
438 int ia32_setup_frame(int sig, struct k_sigaction *ka,
439 compat_sigset_t *set, struct pt_regs *regs)
441 struct sigframe __user *frame;
442 void __user *restorer;
444 struct _fpstate_ia32 __user *fpstate = NULL;
446 /* copy_to_user optimizes that into a single 8 byte store */
447 static const struct {
452 } __attribute__((packed)) code = {
453 0xb858, /* popl %eax ; movl $...,%eax */
455 0x80cd, /* int $0x80 */
459 frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
461 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
464 err |= __put_user(sig, &frame->sig);
468 err |= ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]);
472 if (_COMPAT_NSIG_WORDS > 1) {
473 err |= __copy_to_user(frame->extramask, &set->sig[1],
474 sizeof(frame->extramask));
479 if (ka->sa.sa_flags & SA_RESTORER) {
480 restorer = ka->sa.sa_restorer;
482 /* Return stub is in 32bit vsyscall page */
483 if (current->mm->context.vdso)
484 restorer = VDSO32_SYMBOL(current->mm->context.vdso,
487 restorer = &frame->retcode;
489 err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
492 * These are actually not used anymore, but left because some
493 * gdb versions depend on them as a marker.
495 err |= __copy_to_user(frame->retcode, &code, 8);
499 /* Set up registers for signal handler */
500 regs->sp = (unsigned long) frame;
501 regs->ip = (unsigned long) ka->sa.sa_handler;
503 /* Make -mregparm=3 work */
508 asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
509 asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
511 regs->cs = __USER32_CS;
512 regs->ss = __USER32_DS;
515 printk(KERN_DEBUG "SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n",
516 current->comm, current->pid, frame, regs->ip, frame->pretcode);
522 force_sigsegv(sig, current);
526 int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
527 compat_sigset_t *set, struct pt_regs *regs)
529 struct rt_sigframe __user *frame;
530 void __user *restorer;
532 struct _fpstate_ia32 __user *fpstate = NULL;
534 /* __copy_to_user optimizes that into a single 8 byte store */
535 static const struct {
541 } __attribute__((packed)) code = {
543 __NR_ia32_rt_sigreturn,
548 frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
550 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
553 err |= __put_user(sig, &frame->sig);
554 err |= __put_user(ptr_to_compat(&frame->info), &frame->pinfo);
555 err |= __put_user(ptr_to_compat(&frame->uc), &frame->puc);
556 err |= copy_siginfo_to_user32(&frame->info, info);
560 /* Create the ucontext. */
561 err |= __put_user(0, &frame->uc.uc_flags);
562 err |= __put_user(0, &frame->uc.uc_link);
563 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
564 err |= __put_user(sas_ss_flags(regs->sp),
565 &frame->uc.uc_stack.ss_flags);
566 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
567 err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
569 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
573 if (ka->sa.sa_flags & SA_RESTORER)
574 restorer = ka->sa.sa_restorer;
576 restorer = VDSO32_SYMBOL(current->mm->context.vdso,
578 err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
581 * Not actually used anymore, but left because some gdb
584 err |= __copy_to_user(frame->retcode, &code, 8);
588 /* Set up registers for signal handler */
589 regs->sp = (unsigned long) frame;
590 regs->ip = (unsigned long) ka->sa.sa_handler;
592 /* Make -mregparm=3 work */
594 regs->dx = (unsigned long) &frame->info;
595 regs->cx = (unsigned long) &frame->uc;
597 /* Make -mregparm=3 work */
599 regs->dx = (unsigned long) &frame->info;
600 regs->cx = (unsigned long) &frame->uc;
602 asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
603 asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
605 regs->cs = __USER32_CS;
606 regs->ss = __USER32_DS;
609 printk(KERN_DEBUG "SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n",
610 current->comm, current->pid, frame, regs->ip, frame->pretcode);
616 force_sigsegv(sig, current);