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 <linux/suspend.h>
28 #include <asm/ucontext.h>
29 #include <asm/uaccess.h>
31 #include <asm/proto.h>
33 /* #define DEBUG_SIG 1 */
35 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
37 void ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
38 sigset_t *set, struct pt_regs * regs);
39 void ia32_setup_frame(int sig, struct k_sigaction *ka,
40 sigset_t *set, struct pt_regs * regs);
43 sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs)
45 sigset_t saveset, newset;
47 /* XXX: Don't preclude handling different sized sigset_t's. */
48 if (sigsetsize != sizeof(sigset_t))
51 if (copy_from_user(&newset, unewset, sizeof(newset)))
53 sigdelsetmask(&newset, ~_BLOCKABLE);
55 spin_lock_irq(¤t->sighand->siglock);
56 saveset = current->blocked;
57 current->blocked = newset;
59 spin_unlock_irq(¤t->sighand->siglock);
61 printk("rt_sigsuspend savset(%lx) newset(%lx) regs(%p) rip(%lx)\n",
62 saveset, newset, regs, regs->rip);
66 current->state = TASK_INTERRUPTIBLE;
68 if (do_signal(regs, &saveset))
74 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
77 return do_sigaltstack(uss, uoss, regs->rsp);
82 * Do a signal return; undo the signal stack.
93 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, unsigned long *prax)
97 /* Always make any pending restarted system calls return -EINTR */
98 current_thread_info()->restart_block.fn = do_no_restart_syscall;
100 #define COPY(x) err |= __get_user(regs->x, &sc->x)
102 COPY(rdi); COPY(rsi); COPY(rbp); COPY(rsp); COPY(rbx);
103 COPY(rdx); COPY(rcx); COPY(rip);
114 unsigned int tmpflags;
115 err |= __get_user(tmpflags, &sc->eflags);
116 regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
117 regs->orig_rax = -1; /* disable syscall checks */
121 struct _fpstate __user * buf;
122 err |= __get_user(buf, &sc->fpstate);
125 if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
127 err |= restore_i387(buf);
131 err |= __get_user(*prax, &sc->rax);
138 asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
140 struct rt_sigframe __user *frame;
144 frame = (struct rt_sigframe __user *)(regs->rsp - 8);
145 if (verify_area(VERIFY_READ, frame, sizeof(*frame))) {
148 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) {
152 sigdelsetmask(&set, ~_BLOCKABLE);
153 spin_lock_irq(¤t->sighand->siglock);
154 current->blocked = set;
156 spin_unlock_irq(¤t->sighand->siglock);
158 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax)) {
163 printk("%d sigreturn rip:%lx rsp:%lx frame:%p rax:%lx\n",current->pid,regs.rip,regs.rsp,frame,eax);
166 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->rsp) == -EFAULT)
172 signal_fault(regs,frame,"sigreturn");
177 * Set up a signal frame.
181 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned long mask, struct task_struct *me)
184 unsigned long eflags;
186 err |= __put_user(0, &sc->gs);
187 err |= __put_user(0, &sc->fs);
189 err |= __put_user(regs->rdi, &sc->rdi);
190 err |= __put_user(regs->rsi, &sc->rsi);
191 err |= __put_user(regs->rbp, &sc->rbp);
192 err |= __put_user(regs->rsp, &sc->rsp);
193 err |= __put_user(regs->rbx, &sc->rbx);
194 err |= __put_user(regs->rdx, &sc->rdx);
195 err |= __put_user(regs->rcx, &sc->rcx);
196 err |= __put_user(regs->rax, &sc->rax);
197 err |= __put_user(regs->r8, &sc->r8);
198 err |= __put_user(regs->r9, &sc->r9);
199 err |= __put_user(regs->r10, &sc->r10);
200 err |= __put_user(regs->r11, &sc->r11);
201 err |= __put_user(regs->r12, &sc->r12);
202 err |= __put_user(regs->r13, &sc->r13);
203 err |= __put_user(regs->r14, &sc->r14);
204 err |= __put_user(regs->r15, &sc->r15);
205 err |= __put_user(me->thread.trap_no, &sc->trapno);
206 err |= __put_user(me->thread.error_code, &sc->err);
207 err |= __put_user(regs->rip, &sc->rip);
208 eflags = regs->eflags;
209 if (current->ptrace & PT_PTRACED) {
212 err |= __put_user(eflags, &sc->eflags);
213 err |= __put_user(mask, &sc->oldmask);
214 err |= __put_user(me->thread.cr2, &sc->cr2);
220 * Determine which stack to use..
224 get_stack(struct k_sigaction *ka, struct pt_regs *regs, unsigned long size)
228 /* Default to using normal stack - redzone*/
229 rsp = regs->rsp - 128;
231 /* This is the X/Open sanctioned signal stack switching. */
232 /* RED-PEN: redzone on that stack? */
233 if (ka->sa.sa_flags & SA_ONSTACK) {
234 if (sas_ss_flags(rsp) == 0)
235 rsp = current->sas_ss_sp + current->sas_ss_size;
238 return (void __user *)round_down(rsp - size, 16);
241 static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
242 sigset_t *set, struct pt_regs * regs)
244 struct rt_sigframe __user *frame;
245 struct _fpstate __user *fp = NULL;
247 struct task_struct *me = current;
250 fp = get_stack(ka, regs, sizeof(struct _fpstate));
251 frame = (void __user *)round_down((unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8;
253 if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate))) {
257 if (save_i387(fp) < 0)
260 frame = get_stack(ka, regs, sizeof(struct rt_sigframe)) - 8;
263 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) {
267 if (ka->sa.sa_flags & SA_SIGINFO) {
268 err |= copy_siginfo_to_user(&frame->info, info);
274 /* Create the ucontext. */
275 err |= __put_user(0, &frame->uc.uc_flags);
276 err |= __put_user(0, &frame->uc.uc_link);
277 err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
278 err |= __put_user(sas_ss_flags(regs->rsp),
279 &frame->uc.uc_stack.ss_flags);
280 err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
281 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0], me);
282 err |= __put_user(fp, &frame->uc.uc_mcontext.fpstate);
283 if (sizeof(*set) == 16) {
284 __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]);
285 __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]);
287 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
290 /* Set up to return from userspace. If provided, use a stub
291 already in userspace. */
292 /* x86-64 should always use SA_RESTORER. */
293 if (ka->sa.sa_flags & SA_RESTORER) {
294 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
296 /* could use a vstub here */
305 printk("%d old rip %lx old rsp %lx old rax %lx\n", current->pid,regs->rip,regs->rsp,regs->rax);
308 /* Set up registers for signal handler */
310 struct exec_domain *ed = current_thread_info()->exec_domain;
311 if (unlikely(ed && ed->signal_invmap && sig < 32))
312 sig = ed->signal_invmap[sig];
315 /* In case the signal handler was declared without prototypes */
318 /* This also works for non SA_SIGINFO handlers because they expect the
319 next argument after the signal number on the stack. */
320 regs->rsi = (unsigned long)&frame->info;
321 regs->rdx = (unsigned long)&frame->uc;
322 regs->rip = (unsigned long) ka->sa.sa_handler;
324 regs->rsp = (unsigned long)frame;
327 if (regs->eflags & TF_MASK) {
328 if (current->ptrace & PT_PTRACED) {
329 ptrace_notify(SIGTRAP);
331 regs->eflags &= ~TF_MASK;
336 printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
337 current->comm, current->pid, frame, regs->rip, frame->pretcode);
343 force_sigsegv(sig, current);
347 * OK, we're invoking a handler
351 handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
352 sigset_t *oldset, struct pt_regs *regs)
355 printk("handle_signal pid:%d sig:%lu rip:%lx rsp:%lx regs=%p\n", current->pid, sig,
356 regs->rip, regs->rsp, regs);
359 /* Are we from a system call? */
360 if (regs->orig_rax >= 0) {
361 /* If so, check system call restarting.. */
363 case -ERESTART_RESTARTBLOCK:
364 case -ERESTARTNOHAND:
369 if (!(ka->sa.sa_flags & SA_RESTART)) {
374 case -ERESTARTNOINTR:
375 regs->rax = regs->orig_rax;
380 #ifdef CONFIG_IA32_EMULATION
381 if (test_thread_flag(TIF_IA32)) {
382 if (ka->sa.sa_flags & SA_SIGINFO)
383 ia32_setup_rt_frame(sig, ka, info, oldset, regs);
385 ia32_setup_frame(sig, ka, oldset, regs);
388 setup_rt_frame(sig, ka, info, oldset, regs);
390 if (!(ka->sa.sa_flags & SA_NODEFER)) {
391 spin_lock_irq(¤t->sighand->siglock);
392 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
393 sigaddset(¤t->blocked,sig);
395 spin_unlock_irq(¤t->sighand->siglock);
400 * Note that 'init' is a special process: it doesn't get signals it doesn't
401 * want to handle. Thus you cannot kill init even with a SIGKILL even by
404 int do_signal(struct pt_regs *regs, sigset_t *oldset)
406 struct k_sigaction ka;
411 * We want the common case to go fast, which
412 * is why we may in certain cases get here from
413 * kernel mode. Just return without doing anything
416 if ((regs->cs & 3) != 3) {
420 if (current->flags & PF_FREEZE) {
426 oldset = ¤t->blocked;
428 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
430 /* Reenable any watchpoints before delivering the
431 * signal to user space. The processor register will
432 * have been cleared if the watchpoint triggered
435 if (current->thread.debugreg7)
436 asm volatile("movq %0,%%db7" : : "r" (current->thread.debugreg7));
438 /* Whee! Actually deliver the signal. */
439 handle_signal(signr, &info, &ka, oldset, regs);
444 /* Did we come from a system call? */
445 if (regs->orig_rax >= 0) {
446 /* Restart the system call - no handlers present */
447 long res = regs->rax;
448 if (res == -ERESTARTNOHAND ||
449 res == -ERESTARTSYS ||
450 res == -ERESTARTNOINTR) {
451 regs->rax = regs->orig_rax;
454 if (regs->rax == (unsigned long)-ERESTART_RESTARTBLOCK) {
455 regs->rax = __NR_restart_syscall;
462 void do_notify_resume(struct pt_regs *regs, sigset_t *oldset, __u32 thread_info_flags)
465 printk("do_notify_resume flags:%x rip:%lx rsp:%lx caller:%lx pending:%lx\n",
466 thread_info_flags, regs->rip, regs->rsp, __builtin_return_address(0),signal_pending(current));
469 /* Pending single-step? */
470 if (thread_info_flags & _TIF_SINGLESTEP) {
471 regs->eflags |= TF_MASK;
472 clear_thread_flag(TIF_SINGLESTEP);
475 /* deal with pending signal delivery */
476 if (thread_info_flags & _TIF_SIGPENDING)
477 do_signal(regs,oldset);
480 void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
482 struct task_struct *me = current;
484 printk("%s[%d] bad frame in %s frame:%p rip:%lx rsp:%lx orax:%lx\n",
485 me->comm,me->pid,where,frame,regs->rip,regs->rsp,regs->orig_rax);
487 force_sig(SIGSEGV, me);