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, ®s, regs.rip);
66 current->state = TASK_INTERRUPTIBLE;
68 if (do_signal(®s, &saveset))
74 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, struct pt_regs regs)
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);
130 err |= __get_user(*prax, &sc->rax);
137 asmlinkage long sys_rt_sigreturn(struct pt_regs regs)
139 struct rt_sigframe __user *frame;
143 frame = (struct rt_sigframe __user *)(regs.rsp - 8);
144 if (verify_area(VERIFY_READ, frame, sizeof(*frame))) {
147 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) {
151 sigdelsetmask(&set, ~_BLOCKABLE);
152 spin_lock_irq(¤t->sighand->siglock);
153 current->blocked = set;
155 spin_unlock_irq(¤t->sighand->siglock);
157 if (restore_sigcontext(®s, &frame->uc.uc_mcontext, &eax)) {
162 printk("%d sigreturn rip:%lx rsp:%lx frame:%p rax:%lx\n",current->pid,regs.rip,regs.rsp,frame,eax);
165 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs.rsp) == -EFAULT)
171 signal_fault(®s,frame,"sigreturn");
176 * Set up a signal frame.
180 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned long mask, struct task_struct *me)
184 err |= __put_user(0, &sc->gs);
185 err |= __put_user(0, &sc->fs);
187 err |= __put_user(regs->rdi, &sc->rdi);
188 err |= __put_user(regs->rsi, &sc->rsi);
189 err |= __put_user(regs->rbp, &sc->rbp);
190 err |= __put_user(regs->rsp, &sc->rsp);
191 err |= __put_user(regs->rbx, &sc->rbx);
192 err |= __put_user(regs->rdx, &sc->rdx);
193 err |= __put_user(regs->rcx, &sc->rcx);
194 err |= __put_user(regs->rax, &sc->rax);
195 err |= __put_user(regs->r8, &sc->r8);
196 err |= __put_user(regs->r9, &sc->r9);
197 err |= __put_user(regs->r10, &sc->r10);
198 err |= __put_user(regs->r11, &sc->r11);
199 err |= __put_user(regs->r12, &sc->r12);
200 err |= __put_user(regs->r13, &sc->r13);
201 err |= __put_user(regs->r14, &sc->r14);
202 err |= __put_user(regs->r15, &sc->r15);
203 err |= __put_user(me->thread.trap_no, &sc->trapno);
204 err |= __put_user(me->thread.error_code, &sc->err);
205 err |= __put_user(regs->rip, &sc->rip);
206 err |= __put_user(regs->eflags, &sc->eflags);
207 err |= __put_user(mask, &sc->oldmask);
208 err |= __put_user(me->thread.cr2, &sc->cr2);
214 * Determine which stack to use..
218 get_stack(struct k_sigaction *ka, struct pt_regs *regs, unsigned long size)
222 /* Default to using normal stack - redzone*/
223 rsp = regs->rsp - 128;
225 /* This is the X/Open sanctioned signal stack switching. */
226 /* RED-PEN: redzone on that stack? */
227 if (ka->sa.sa_flags & SA_ONSTACK) {
228 if (sas_ss_flags(rsp) == 0)
229 rsp = current->sas_ss_sp + current->sas_ss_size;
232 return (void __user *)round_down(rsp - size, 16);
235 static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
236 sigset_t *set, struct pt_regs * regs)
238 struct rt_sigframe __user *frame;
239 struct _fpstate __user *fp = NULL;
241 struct task_struct *me = current;
244 fp = get_stack(ka, regs, sizeof(struct _fpstate));
245 frame = (void __user *)round_down((u64)fp - sizeof(struct rt_sigframe), 16) - 8;
247 if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate))) {
251 if (save_i387(fp) < 0)
254 frame = get_stack(ka, regs, sizeof(struct rt_sigframe)) - 8;
257 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) {
261 if (ka->sa.sa_flags & SA_SIGINFO) {
262 err |= copy_siginfo_to_user(&frame->info, info);
268 /* Create the ucontext. */
269 err |= __put_user(0, &frame->uc.uc_flags);
270 err |= __put_user(0, &frame->uc.uc_link);
271 err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
272 err |= __put_user(sas_ss_flags(regs->rsp),
273 &frame->uc.uc_stack.ss_flags);
274 err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
275 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0], me);
276 err |= __put_user(fp, &frame->uc.uc_mcontext.fpstate);
277 if (sizeof(*set) == 16) {
278 __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]);
279 __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]);
281 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
284 /* Set up to return from userspace. If provided, use a stub
285 already in userspace. */
286 /* x86-64 should always use SA_RESTORER. */
287 if (ka->sa.sa_flags & SA_RESTORER) {
288 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
290 printk("%s forgot to set SA_RESTORER for signal %d.\n", me->comm, sig);
299 printk("%d old rip %lx old rsp %lx old rax %lx\n", current->pid,regs->rip,regs->rsp,regs->rax);
302 /* Set up registers for signal handler */
304 struct exec_domain *ed = current_thread_info()->exec_domain;
305 if (unlikely(ed && ed->signal_invmap && sig < 32))
306 sig = ed->signal_invmap[sig];
309 /* In case the signal handler was declared without prototypes */
312 /* This also works for non SA_SIGINFO handlers because they expect the
313 next argument after the signal number on the stack. */
314 regs->rsi = (unsigned long)&frame->info;
315 regs->rdx = (unsigned long)&frame->uc;
316 regs->rip = (unsigned long) ka->sa.sa_handler;
318 regs->rsp = (unsigned long)frame;
321 regs->eflags &= ~TF_MASK;
324 printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
325 current->comm, current->pid, frame, regs->rip, frame->pretcode);
332 ka->sa.sa_handler = SIG_DFL;
333 signal_fault(regs,frame,"signal deliver");
337 * OK, we're invoking a handler
341 handle_signal(unsigned long sig, siginfo_t *info, sigset_t *oldset,
342 struct pt_regs * regs)
344 struct k_sigaction *ka = ¤t->sighand->action[sig-1];
347 printk("handle_signal pid:%d sig:%lu rip:%lx rsp:%lx regs=%p\n", current->pid, sig,
348 regs->rip, regs->rsp, regs);
351 /* Are we from a system call? */
352 if (regs->orig_rax >= 0) {
353 /* If so, check system call restarting.. */
355 case -ERESTART_RESTARTBLOCK:
356 case -ERESTARTNOHAND:
361 if (!(ka->sa.sa_flags & SA_RESTART)) {
366 case -ERESTARTNOINTR:
367 regs->rax = regs->orig_rax;
372 #ifdef CONFIG_IA32_EMULATION
373 if (test_thread_flag(TIF_IA32)) {
374 if (ka->sa.sa_flags & SA_SIGINFO)
375 ia32_setup_rt_frame(sig, ka, info, oldset, regs);
377 ia32_setup_frame(sig, ka, oldset, regs);
380 setup_rt_frame(sig, ka, info, oldset, regs);
382 if (ka->sa.sa_flags & SA_ONESHOT)
383 ka->sa.sa_handler = SIG_DFL;
385 if (!(ka->sa.sa_flags & SA_NODEFER)) {
386 spin_lock_irq(¤t->sighand->siglock);
387 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
388 sigaddset(¤t->blocked,sig);
390 spin_unlock_irq(¤t->sighand->siglock);
395 * Note that 'init' is a special process: it doesn't get signals it doesn't
396 * want to handle. Thus you cannot kill init even with a SIGKILL even by
399 int do_signal(struct pt_regs *regs, sigset_t *oldset)
405 * We want the common case to go fast, which
406 * is why we may in certain cases get here from
407 * kernel mode. Just return without doing anything
410 if ((regs->cs & 3) != 3) {
414 if (current->flags & PF_FREEZE) {
420 oldset = ¤t->blocked;
422 signr = get_signal_to_deliver(&info, regs, NULL);
424 /* Reenable any watchpoints before delivering the
425 * signal to user space. The processor register will
426 * have been cleared if the watchpoint triggered
429 if (current->thread.debugreg7)
430 asm volatile("movq %0,%%db7" : : "r" (current->thread.debugreg7));
432 /* Whee! Actually deliver the signal. */
433 handle_signal(signr, &info, oldset, regs);
438 /* Did we come from a system call? */
439 if (regs->orig_rax >= 0) {
440 /* Restart the system call - no handlers present */
441 long res = regs->rax;
442 if (res == -ERESTARTNOHAND ||
443 res == -ERESTARTSYS ||
444 res == -ERESTARTNOINTR) {
445 regs->rax = regs->orig_rax;
448 if (regs->rax == (unsigned long)-ERESTART_RESTARTBLOCK) {
449 regs->rax = __NR_restart_syscall;
456 void do_notify_resume(struct pt_regs *regs, sigset_t *oldset, __u32 thread_info_flags)
459 printk("do_notify_resume flags:%x rip:%lx rsp:%lx caller:%lx pending:%lx\n",
460 thread_info_flags, regs->rip, regs->rsp, __builtin_return_address(0),signal_pending(current));
463 /* Pending single-step? */
464 if (thread_info_flags & _TIF_SINGLESTEP) {
465 regs->eflags |= TF_MASK;
466 clear_thread_flag(TIF_SINGLESTEP);
469 /* deal with pending signal delivery */
470 if (thread_info_flags & _TIF_SIGPENDING)
471 do_signal(regs,oldset);
474 void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
476 struct task_struct *me = current;
478 printk("%s[%d] bad frame in %s frame:%p rip:%lx rsp:%lx orax:%lx\n",
479 me->comm,me->pid,where,frame,regs->rip,regs->rsp,regs->orig_rax);
481 force_sig(SIGSEGV, me);