2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 * Copyright (C) 1994 - 2000 Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
10 #include <linux/cache.h>
11 #include <linux/context_tracking.h>
12 #include <linux/irqflags.h>
13 #include <linux/sched.h>
15 #include <linux/personality.h>
16 #include <linux/smp.h>
17 #include <linux/kernel.h>
18 #include <linux/signal.h>
19 #include <linux/errno.h>
20 #include <linux/wait.h>
21 #include <linux/ptrace.h>
22 #include <linux/unistd.h>
23 #include <linux/compiler.h>
24 #include <linux/syscalls.h>
25 #include <linux/uaccess.h>
26 #include <linux/tracehook.h>
30 #include <linux/bitops.h>
31 #include <asm/cacheflush.h>
34 #include <asm/ucontext.h>
35 #include <asm/cpu-features.h>
41 #include "signal-common.h"
43 static int (*save_fp_context)(struct sigcontext __user *sc);
44 static int (*restore_fp_context)(struct sigcontext __user *sc);
46 extern asmlinkage int _save_fp_context(struct sigcontext __user *sc);
47 extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc);
49 extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc);
50 extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc);
53 u32 sf_ass[4]; /* argument save space for o32 */
54 u32 sf_pad[2]; /* Was: signal trampoline */
55 struct sigcontext sf_sc;
60 u32 rs_ass[4]; /* argument save space for o32 */
61 u32 rs_pad[2]; /* Was: signal trampoline */
62 struct siginfo rs_info;
63 struct ucontext rs_uc;
69 static int protected_save_fp_context(struct sigcontext __user *sc)
74 err = own_fpu_inatomic(1);
76 err = save_fp_context(sc); /* this might fail */
80 /* touch the sigcontext and try again */
81 err = __put_user(0, &sc->sc_fpregs[0]) |
82 __put_user(0, &sc->sc_fpregs[31]) |
83 __put_user(0, &sc->sc_fpc_csr);
85 break; /* really bad sigcontext */
90 static int protected_restore_fp_context(struct sigcontext __user *sc)
92 int err, tmp __maybe_unused;
95 err = own_fpu_inatomic(0);
97 err = restore_fp_context(sc); /* this might fail */
101 /* touch the sigcontext and try again */
102 err = __get_user(tmp, &sc->sc_fpregs[0]) |
103 __get_user(tmp, &sc->sc_fpregs[31]) |
104 __get_user(tmp, &sc->sc_fpc_csr);
106 break; /* really bad sigcontext */
111 int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
115 unsigned int used_math;
117 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
119 err |= __put_user(0, &sc->sc_regs[0]);
120 for (i = 1; i < 32; i++)
121 err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
123 #ifdef CONFIG_CPU_HAS_SMARTMIPS
124 err |= __put_user(regs->acx, &sc->sc_acx);
126 err |= __put_user(regs->hi, &sc->sc_mdhi);
127 err |= __put_user(regs->lo, &sc->sc_mdlo);
129 err |= __put_user(mfhi1(), &sc->sc_hi1);
130 err |= __put_user(mflo1(), &sc->sc_lo1);
131 err |= __put_user(mfhi2(), &sc->sc_hi2);
132 err |= __put_user(mflo2(), &sc->sc_lo2);
133 err |= __put_user(mfhi3(), &sc->sc_hi3);
134 err |= __put_user(mflo3(), &sc->sc_lo3);
135 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
138 used_math = !!used_math();
139 err |= __put_user(used_math, &sc->sc_used_math);
143 * Save FPU state to signal context. Signal handler
144 * will "inherit" current FPU state.
146 err |= protected_save_fp_context(sc);
151 int fpcsr_pending(unsigned int __user *fpcsr)
154 unsigned int csr, enabled;
156 err = __get_user(csr, fpcsr);
157 enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5);
159 * If the signal handler set some FPU exceptions, clear it and
164 err |= __put_user(csr, fpcsr);
171 check_and_restore_fp_context(struct sigcontext __user *sc)
175 err = sig = fpcsr_pending(&sc->sc_fpc_csr);
178 err |= protected_restore_fp_context(sc);
182 int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
184 unsigned int used_math;
189 /* Always make any pending restarted system calls return -EINTR */
190 current_thread_info()->restart_block.fn = do_no_restart_syscall;
192 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
194 #ifdef CONFIG_CPU_HAS_SMARTMIPS
195 err |= __get_user(regs->acx, &sc->sc_acx);
197 err |= __get_user(regs->hi, &sc->sc_mdhi);
198 err |= __get_user(regs->lo, &sc->sc_mdlo);
200 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
201 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
202 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
203 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
204 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
205 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
206 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
209 for (i = 1; i < 32; i++)
210 err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
212 err |= __get_user(used_math, &sc->sc_used_math);
213 conditional_used_math(used_math);
216 /* restore fpu context if we have used it before */
218 err = check_and_restore_fp_context(sc);
220 /* signal handler may have used FPU. Give it up. */
227 void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
232 /* Default to using normal stack */
236 * FPU emulator may have it's own trampoline active just
237 * above the user stack, 16-bytes before the next lowest
238 * 16 byte boundary. Try to avoid trashing it.
242 /* This is the X/Open sanctioned signal stack switching. */
243 if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
244 sp = current->sas_ss_sp + current->sas_ss_size;
246 return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
250 * Atomically swap in the new signal mask, and wait for a signal.
253 #ifdef CONFIG_TRAD_SIGNALS
254 SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset)
256 return sys_rt_sigsuspend(uset, sizeof(sigset_t));
260 #ifdef CONFIG_TRAD_SIGNALS
261 SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act,
262 struct sigaction __user *, oact)
264 struct k_sigaction new_ka, old_ka;
271 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
273 err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
274 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
275 err |= __get_user(mask, &act->sa_mask.sig[0]);
279 siginitset(&new_ka.sa.sa_mask, mask);
282 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
285 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
287 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
288 err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
289 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
290 err |= __put_user(0, &oact->sa_mask.sig[1]);
291 err |= __put_user(0, &oact->sa_mask.sig[2]);
292 err |= __put_user(0, &oact->sa_mask.sig[3]);
301 #ifdef CONFIG_TRAD_SIGNALS
302 asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs)
304 struct sigframe __user *frame;
308 frame = (struct sigframe __user *) regs.regs[29];
309 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
311 if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
314 set_current_blocked(&blocked);
316 sig = restore_sigcontext(®s, &frame->sf_sc);
320 force_sig(sig, current);
323 * Don't let your children do this ...
325 __asm__ __volatile__(
333 force_sig(SIGSEGV, current);
335 #endif /* CONFIG_TRAD_SIGNALS */
337 asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
339 struct rt_sigframe __user *frame;
343 frame = (struct rt_sigframe __user *) regs.regs[29];
344 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
346 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
349 set_current_blocked(&set);
351 sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext);
355 force_sig(sig, current);
357 if (restore_altstack(&frame->rs_uc.uc_stack))
361 * Don't let your children do this ...
363 __asm__ __volatile__(
371 force_sig(SIGSEGV, current);
374 #ifdef CONFIG_TRAD_SIGNALS
375 static int setup_frame(void *sig_return, struct k_sigaction *ka,
376 struct pt_regs *regs, int signr, sigset_t *set)
378 struct sigframe __user *frame;
381 frame = get_sigframe(ka, regs, sizeof(*frame));
382 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
385 err |= setup_sigcontext(regs, &frame->sf_sc);
386 err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
391 * Arguments to signal handler:
394 * a1 = 0 (should be cause)
395 * a2 = pointer to struct sigcontext
397 * $25 and c0_epc point to the signal handler, $29 points to the
400 regs->regs[ 4] = signr;
402 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
403 regs->regs[29] = (unsigned long) frame;
404 regs->regs[31] = (unsigned long) sig_return;
405 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
407 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
408 current->comm, current->pid,
409 frame, regs->cp0_epc, regs->regs[31]);
413 force_sigsegv(signr, current);
418 static int setup_rt_frame(void *sig_return, struct k_sigaction *ka,
419 struct pt_regs *regs, int signr, sigset_t *set,
422 struct rt_sigframe __user *frame;
425 frame = get_sigframe(ka, regs, sizeof(*frame));
426 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
429 /* Create siginfo. */
430 err |= copy_siginfo_to_user(&frame->rs_info, info);
432 /* Create the ucontext. */
433 err |= __put_user(0, &frame->rs_uc.uc_flags);
434 err |= __put_user(NULL, &frame->rs_uc.uc_link);
435 err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
436 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
437 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
443 * Arguments to signal handler:
446 * a1 = 0 (should be cause)
447 * a2 = pointer to ucontext
449 * $25 and c0_epc point to the signal handler, $29 points to
450 * the struct rt_sigframe.
452 regs->regs[ 4] = signr;
453 regs->regs[ 5] = (unsigned long) &frame->rs_info;
454 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
455 regs->regs[29] = (unsigned long) frame;
456 regs->regs[31] = (unsigned long) sig_return;
457 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
459 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
460 current->comm, current->pid,
461 frame, regs->cp0_epc, regs->regs[31]);
466 force_sigsegv(signr, current);
470 struct mips_abi mips_abi = {
471 #ifdef CONFIG_TRAD_SIGNALS
472 .setup_frame = setup_frame,
473 .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline),
475 .setup_rt_frame = setup_rt_frame,
476 .rt_signal_return_offset =
477 offsetof(struct mips_vdso, rt_signal_trampoline),
478 .restart = __NR_restart_syscall
481 static void handle_signal(unsigned long sig, siginfo_t *info,
482 struct k_sigaction *ka, struct pt_regs *regs)
484 sigset_t *oldset = sigmask_to_save();
486 struct mips_abi *abi = current->thread.abi;
487 #ifdef CONFIG_CPU_MICROMIPS
489 unsigned int tmp = (unsigned int)current->mm->context.vdso;
494 void *vdso = current->mm->context.vdso;
498 switch(regs->regs[2]) {
499 case ERESTART_RESTARTBLOCK:
501 regs->regs[2] = EINTR;
504 if (!(ka->sa.sa_flags & SA_RESTART)) {
505 regs->regs[2] = EINTR;
510 regs->regs[7] = regs->regs[26];
511 regs->regs[2] = regs->regs[0];
515 regs->regs[0] = 0; /* Don't deal with this again. */
518 if (sig_uses_siginfo(ka))
519 ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset,
520 ka, regs, sig, oldset, info);
522 ret = abi->setup_frame(vdso + abi->signal_return_offset,
523 ka, regs, sig, oldset);
528 signal_delivered(sig, info, ka, regs, 0);
531 static void do_signal(struct pt_regs *regs)
533 struct k_sigaction ka;
537 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
539 /* Whee! Actually deliver the signal. */
540 handle_signal(signr, &info, &ka, regs);
545 switch (regs->regs[2]) {
549 regs->regs[2] = regs->regs[0];
550 regs->regs[7] = regs->regs[26];
554 case ERESTART_RESTARTBLOCK:
555 regs->regs[2] = current->thread.abi->restart;
556 regs->regs[7] = regs->regs[26];
560 regs->regs[0] = 0; /* Don't deal with this again. */
564 * If there's no signal to deliver, we just put the saved sigmask
567 restore_saved_sigmask();
571 * notification of userspace execution resumption
572 * - triggered by the TIF_WORK_MASK flags
574 asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
575 __u32 thread_info_flags)
581 /* deal with pending signal delivery */
582 if (thread_info_flags & _TIF_SIGPENDING)
585 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
586 clear_thread_flag(TIF_NOTIFY_RESUME);
587 tracehook_notify_resume(regs);
594 static int smp_save_fp_context(struct sigcontext __user *sc)
596 return raw_cpu_has_fpu
597 ? _save_fp_context(sc)
598 : fpu_emulator_save_context(sc);
601 static int smp_restore_fp_context(struct sigcontext __user *sc)
603 return raw_cpu_has_fpu
604 ? _restore_fp_context(sc)
605 : fpu_emulator_restore_context(sc);
609 static int signal_setup(void)
612 /* For now just do the cpu_has_fpu check when the functions are invoked */
613 save_fp_context = smp_save_fp_context;
614 restore_fp_context = smp_restore_fp_context;
617 save_fp_context = _save_fp_context;
618 restore_fp_context = _restore_fp_context;
620 save_fp_context = fpu_emulator_save_context;
621 restore_fp_context = fpu_emulator_restore_context;
628 arch_initcall(signal_setup);