2 * linux/arch/x86_64/kernel/signal.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs
7 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
8 * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
9 * 2000-2002 x86-64 support by Andi Kleen
11 * $Id: signal.c,v 1.18 2001/10/17 22:30:37 ak Exp $
14 #include <linux/sched.h>
16 #include <linux/smp.h>
17 #include <linux/smp_lock.h>
18 #include <linux/kernel.h>
19 #include <linux/signal.h>
20 #include <linux/errno.h>
21 #include <linux/wait.h>
22 #include <linux/ptrace.h>
23 #include <linux/unistd.h>
24 #include <linux/stddef.h>
25 #include <linux/personality.h>
26 #include <linux/compiler.h>
27 #include <asm/ucontext.h>
28 #include <asm/uaccess.h>
30 #include <asm/proto.h>
32 /* #define DEBUG_SIG 1 */
34 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
36 void ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
37 sigset_t *set, struct pt_regs * regs);
38 void ia32_setup_frame(int sig, struct k_sigaction *ka,
39 sigset_t *set, struct pt_regs * regs);
42 sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs)
44 sigset_t saveset, newset;
46 /* XXX: Don't preclude handling different sized sigset_t's. */
47 if (sigsetsize != sizeof(sigset_t))
50 if (copy_from_user(&newset, unewset, sizeof(newset)))
52 sigdelsetmask(&newset, ~_BLOCKABLE);
54 spin_lock_irq(¤t->sighand->siglock);
55 saveset = current->blocked;
56 current->blocked = newset;
58 spin_unlock_irq(¤t->sighand->siglock);
60 printk("rt_sigsuspend savset(%lx) newset(%lx) regs(%p) rip(%lx)\n",
61 saveset, newset, regs, regs->rip);
65 current->state = TASK_INTERRUPTIBLE;
67 if (do_signal(regs, &saveset))
73 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
76 return do_sigaltstack(uss, uoss, regs->rsp);
81 * Do a signal return; undo the signal stack.
92 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, unsigned long *prax)
96 /* Always make any pending restarted system calls return -EINTR */
97 current_thread_info()->restart_block.fn = do_no_restart_syscall;
99 #define COPY(x) err |= __get_user(regs->x, &sc->x)
101 COPY(rdi); COPY(rsi); COPY(rbp); COPY(rsp); COPY(rbx);
102 COPY(rdx); COPY(rcx); COPY(rip);
113 unsigned int tmpflags;
114 err |= __get_user(tmpflags, &sc->eflags);
115 regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
116 regs->orig_rax = -1; /* disable syscall checks */
120 struct _fpstate __user * buf;
121 err |= __get_user(buf, &sc->fpstate);
124 if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
126 err |= restore_i387(buf);
128 struct task_struct *me = current;
136 err |= __get_user(*prax, &sc->rax);
143 asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
145 struct rt_sigframe __user *frame;
149 frame = (struct rt_sigframe __user *)(regs->rsp - 8);
150 if (verify_area(VERIFY_READ, frame, sizeof(*frame))) {
153 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) {
157 sigdelsetmask(&set, ~_BLOCKABLE);
158 spin_lock_irq(¤t->sighand->siglock);
159 current->blocked = set;
161 spin_unlock_irq(¤t->sighand->siglock);
163 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax)) {
168 printk("%d sigreturn rip:%lx rsp:%lx frame:%p rax:%lx\n",current->pid,regs.rip,regs.rsp,frame,eax);
171 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->rsp) == -EFAULT)
177 signal_fault(regs,frame,"sigreturn");
182 * Set up a signal frame.
186 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned long mask, struct task_struct *me)
189 unsigned long eflags;
191 err |= __put_user(0, &sc->gs);
192 err |= __put_user(0, &sc->fs);
194 err |= __put_user(regs->rdi, &sc->rdi);
195 err |= __put_user(regs->rsi, &sc->rsi);
196 err |= __put_user(regs->rbp, &sc->rbp);
197 err |= __put_user(regs->rsp, &sc->rsp);
198 err |= __put_user(regs->rbx, &sc->rbx);
199 err |= __put_user(regs->rdx, &sc->rdx);
200 err |= __put_user(regs->rcx, &sc->rcx);
201 err |= __put_user(regs->rax, &sc->rax);
202 err |= __put_user(regs->r8, &sc->r8);
203 err |= __put_user(regs->r9, &sc->r9);
204 err |= __put_user(regs->r10, &sc->r10);
205 err |= __put_user(regs->r11, &sc->r11);
206 err |= __put_user(regs->r12, &sc->r12);
207 err |= __put_user(regs->r13, &sc->r13);
208 err |= __put_user(regs->r14, &sc->r14);
209 err |= __put_user(regs->r15, &sc->r15);
210 err |= __put_user(me->thread.trap_no, &sc->trapno);
211 err |= __put_user(me->thread.error_code, &sc->err);
212 err |= __put_user(regs->rip, &sc->rip);
213 eflags = regs->eflags;
214 if (current->ptrace & PT_PTRACED) {
217 err |= __put_user(eflags, &sc->eflags);
218 err |= __put_user(mask, &sc->oldmask);
219 err |= __put_user(me->thread.cr2, &sc->cr2);
225 * Determine which stack to use..
229 get_stack(struct k_sigaction *ka, struct pt_regs *regs, unsigned long size)
233 /* Default to using normal stack - redzone*/
234 rsp = regs->rsp - 128;
236 /* This is the X/Open sanctioned signal stack switching. */
237 /* RED-PEN: redzone on that stack? */
238 if (ka->sa.sa_flags & SA_ONSTACK) {
239 if (sas_ss_flags(rsp) == 0)
240 rsp = current->sas_ss_sp + current->sas_ss_size;
243 return (void __user *)round_down(rsp - size, 16);
246 static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
247 sigset_t *set, struct pt_regs * regs)
249 struct rt_sigframe __user *frame;
250 struct _fpstate __user *fp = NULL;
252 struct task_struct *me = current;
255 fp = get_stack(ka, regs, sizeof(struct _fpstate));
256 frame = (void __user *)round_down((unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8;
258 if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate))) {
262 if (save_i387(fp) < 0)
265 frame = get_stack(ka, regs, sizeof(struct rt_sigframe)) - 8;
268 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) {
272 if (ka->sa.sa_flags & SA_SIGINFO) {
273 err |= copy_siginfo_to_user(&frame->info, info);
279 /* Create the ucontext. */
280 err |= __put_user(0, &frame->uc.uc_flags);
281 err |= __put_user(0, &frame->uc.uc_link);
282 err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
283 err |= __put_user(sas_ss_flags(regs->rsp),
284 &frame->uc.uc_stack.ss_flags);
285 err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
286 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0], me);
287 err |= __put_user(fp, &frame->uc.uc_mcontext.fpstate);
288 if (sizeof(*set) == 16) {
289 __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]);
290 __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]);
292 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
295 /* Set up to return from userspace. If provided, use a stub
296 already in userspace. */
297 /* x86-64 should always use SA_RESTORER. */
298 if (ka->sa.sa_flags & SA_RESTORER) {
299 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
301 /* could use a vstub here */
310 printk("%d old rip %lx old rsp %lx old rax %lx\n", current->pid,regs->rip,regs->rsp,regs->rax);
313 /* Set up registers for signal handler */
315 struct exec_domain *ed = current_thread_info()->exec_domain;
316 if (unlikely(ed && ed->signal_invmap && sig < 32))
317 sig = ed->signal_invmap[sig];
320 /* In case the signal handler was declared without prototypes */
323 /* This also works for non SA_SIGINFO handlers because they expect the
324 next argument after the signal number on the stack. */
325 regs->rsi = (unsigned long)&frame->info;
326 regs->rdx = (unsigned long)&frame->uc;
327 regs->rip = (unsigned long) ka->sa.sa_handler;
329 regs->rsp = (unsigned long)frame;
332 if (regs->eflags & TF_MASK) {
333 if ((current->ptrace & (PT_PTRACED | PT_DTRACE)) == (PT_PTRACED | PT_DTRACE)) {
334 ptrace_notify(SIGTRAP);
336 regs->eflags &= ~TF_MASK;
341 printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
342 current->comm, current->pid, frame, regs->rip, frame->pretcode);
348 force_sigsegv(sig, current);
352 * OK, we're invoking a handler
356 handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
357 sigset_t *oldset, struct pt_regs *regs)
360 printk("handle_signal pid:%d sig:%lu rip:%lx rsp:%lx regs=%p\n", current->pid, sig,
361 regs->rip, regs->rsp, regs);
364 /* Are we from a system call? */
365 if ((long)regs->orig_rax >= 0) {
366 /* If so, check system call restarting.. */
368 case -ERESTART_RESTARTBLOCK:
369 case -ERESTARTNOHAND:
374 if (!(ka->sa.sa_flags & SA_RESTART)) {
379 case -ERESTARTNOINTR:
380 regs->rax = regs->orig_rax;
385 #ifdef CONFIG_IA32_EMULATION
386 if (test_thread_flag(TIF_IA32)) {
387 if (ka->sa.sa_flags & SA_SIGINFO)
388 ia32_setup_rt_frame(sig, ka, info, oldset, regs);
390 ia32_setup_frame(sig, ka, oldset, regs);
393 setup_rt_frame(sig, ka, info, oldset, regs);
395 if (!(ka->sa.sa_flags & SA_NODEFER)) {
396 spin_lock_irq(¤t->sighand->siglock);
397 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
398 sigaddset(¤t->blocked,sig);
400 spin_unlock_irq(¤t->sighand->siglock);
405 * Note that 'init' is a special process: it doesn't get signals it doesn't
406 * want to handle. Thus you cannot kill init even with a SIGKILL even by
409 int do_signal(struct pt_regs *regs, sigset_t *oldset)
411 struct k_sigaction ka;
416 * We want the common case to go fast, which
417 * is why we may in certain cases get here from
418 * kernel mode. Just return without doing anything
421 if ((regs->cs & 3) != 3) {
425 if (try_to_freeze(0))
429 oldset = ¤t->blocked;
431 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
433 /* Reenable any watchpoints before delivering the
434 * signal to user space. The processor register will
435 * have been cleared if the watchpoint triggered
438 if (current->thread.debugreg7)
439 asm volatile("movq %0,%%db7" : : "r" (current->thread.debugreg7));
441 /* Whee! Actually deliver the signal. */
442 handle_signal(signr, &info, &ka, oldset, regs);
447 /* Did we come from a system call? */
448 if ((long)regs->orig_rax >= 0) {
449 /* Restart the system call - no handlers present */
450 long res = regs->rax;
451 if (res == -ERESTARTNOHAND ||
452 res == -ERESTARTSYS ||
453 res == -ERESTARTNOINTR) {
454 regs->rax = regs->orig_rax;
457 if (regs->rax == (unsigned long)-ERESTART_RESTARTBLOCK) {
458 regs->rax = __NR_restart_syscall;
465 void do_notify_resume(struct pt_regs *regs, sigset_t *oldset, __u32 thread_info_flags)
468 printk("do_notify_resume flags:%x rip:%lx rsp:%lx caller:%lx pending:%lx\n",
469 thread_info_flags, regs->rip, regs->rsp, __builtin_return_address(0),signal_pending(current));
472 /* Pending single-step? */
473 if (thread_info_flags & _TIF_SINGLESTEP) {
474 regs->eflags |= TF_MASK;
475 clear_thread_flag(TIF_SINGLESTEP);
478 /* deal with pending signal delivery */
479 if (thread_info_flags & _TIF_SIGPENDING)
480 do_signal(regs,oldset);
483 void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
485 struct task_struct *me = current;
487 printk("%s[%d] bad frame in %s frame:%p rip:%lx rsp:%lx orax:%lx\n",
488 me->comm,me->pid,where,frame,regs->rip,regs->rsp,regs->orig_rax);
490 force_sig(SIGSEGV, me);