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)
75 err = save_fp_context(sc); /* this might fail */
79 /* touch the sigcontext and try again */
80 err = __put_user(0, &sc->sc_fpregs[0]) |
81 __put_user(0, &sc->sc_fpregs[31]) |
82 __put_user(0, &sc->sc_fpc_csr);
84 break; /* really bad sigcontext */
89 static int protected_restore_fp_context(struct sigcontext __user *sc)
91 int err, tmp __maybe_unused;
95 err = restore_fp_context(sc); /* this might fail */
99 /* touch the sigcontext and try again */
100 err = __get_user(tmp, &sc->sc_fpregs[0]) |
101 __get_user(tmp, &sc->sc_fpregs[31]) |
102 __get_user(tmp, &sc->sc_fpc_csr);
104 break; /* really bad sigcontext */
109 int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
113 unsigned int used_math;
115 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
117 err |= __put_user(0, &sc->sc_regs[0]);
118 for (i = 1; i < 32; i++)
119 err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
121 #ifdef CONFIG_CPU_HAS_SMARTMIPS
122 err |= __put_user(regs->acx, &sc->sc_acx);
124 err |= __put_user(regs->hi, &sc->sc_mdhi);
125 err |= __put_user(regs->lo, &sc->sc_mdlo);
127 err |= __put_user(mfhi1(), &sc->sc_hi1);
128 err |= __put_user(mflo1(), &sc->sc_lo1);
129 err |= __put_user(mfhi2(), &sc->sc_hi2);
130 err |= __put_user(mflo2(), &sc->sc_lo2);
131 err |= __put_user(mfhi3(), &sc->sc_hi3);
132 err |= __put_user(mflo3(), &sc->sc_lo3);
133 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
136 used_math = !!used_math();
137 err |= __put_user(used_math, &sc->sc_used_math);
141 * Save FPU state to signal context. Signal handler
142 * will "inherit" current FPU state.
144 err |= protected_save_fp_context(sc);
149 int fpcsr_pending(unsigned int __user *fpcsr)
152 unsigned int csr, enabled;
154 err = __get_user(csr, fpcsr);
155 enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5);
157 * If the signal handler set some FPU exceptions, clear it and
162 err |= __put_user(csr, fpcsr);
169 check_and_restore_fp_context(struct sigcontext __user *sc)
173 err = sig = fpcsr_pending(&sc->sc_fpc_csr);
176 err |= protected_restore_fp_context(sc);
180 int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
182 unsigned int used_math;
187 /* Always make any pending restarted system calls return -EINTR */
188 current_thread_info()->restart_block.fn = do_no_restart_syscall;
190 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
192 #ifdef CONFIG_CPU_HAS_SMARTMIPS
193 err |= __get_user(regs->acx, &sc->sc_acx);
195 err |= __get_user(regs->hi, &sc->sc_mdhi);
196 err |= __get_user(regs->lo, &sc->sc_mdlo);
198 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
199 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
200 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
201 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
202 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
203 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
204 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
207 for (i = 1; i < 32; i++)
208 err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
210 err |= __get_user(used_math, &sc->sc_used_math);
211 conditional_used_math(used_math);
214 /* restore fpu context if we have used it before */
216 err = check_and_restore_fp_context(sc);
218 /* signal handler may have used FPU. Give it up. */
225 void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
230 /* Default to using normal stack */
234 * FPU emulator may have it's own trampoline active just
235 * above the user stack, 16-bytes before the next lowest
236 * 16 byte boundary. Try to avoid trashing it.
240 /* This is the X/Open sanctioned signal stack switching. */
241 if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
242 sp = current->sas_ss_sp + current->sas_ss_size;
244 return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
248 * Atomically swap in the new signal mask, and wait for a signal.
251 #ifdef CONFIG_TRAD_SIGNALS
252 SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset)
254 return sys_rt_sigsuspend(uset, sizeof(sigset_t));
258 #ifdef CONFIG_TRAD_SIGNALS
259 SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act,
260 struct sigaction __user *, oact)
262 struct k_sigaction new_ka, old_ka;
269 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
271 err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
272 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
273 err |= __get_user(mask, &act->sa_mask.sig[0]);
277 siginitset(&new_ka.sa.sa_mask, mask);
280 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
283 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
285 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
286 err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
287 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
288 err |= __put_user(0, &oact->sa_mask.sig[1]);
289 err |= __put_user(0, &oact->sa_mask.sig[2]);
290 err |= __put_user(0, &oact->sa_mask.sig[3]);
299 #ifdef CONFIG_TRAD_SIGNALS
300 asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs)
302 struct sigframe __user *frame;
306 frame = (struct sigframe __user *) regs.regs[29];
307 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
309 if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
312 set_current_blocked(&blocked);
314 sig = restore_sigcontext(®s, &frame->sf_sc);
318 force_sig(sig, current);
321 * Don't let your children do this ...
323 __asm__ __volatile__(
331 force_sig(SIGSEGV, current);
333 #endif /* CONFIG_TRAD_SIGNALS */
335 asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
337 struct rt_sigframe __user *frame;
341 frame = (struct rt_sigframe __user *) regs.regs[29];
342 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
344 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
347 set_current_blocked(&set);
349 sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext);
353 force_sig(sig, current);
355 if (restore_altstack(&frame->rs_uc.uc_stack))
359 * Don't let your children do this ...
361 __asm__ __volatile__(
369 force_sig(SIGSEGV, current);
372 #ifdef CONFIG_TRAD_SIGNALS
373 static int setup_frame(void *sig_return, struct k_sigaction *ka,
374 struct pt_regs *regs, int signr, sigset_t *set)
376 struct sigframe __user *frame;
379 frame = get_sigframe(ka, regs, sizeof(*frame));
380 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
383 err |= setup_sigcontext(regs, &frame->sf_sc);
384 err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
389 * Arguments to signal handler:
392 * a1 = 0 (should be cause)
393 * a2 = pointer to struct sigcontext
395 * $25 and c0_epc point to the signal handler, $29 points to the
398 regs->regs[ 4] = signr;
400 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
401 regs->regs[29] = (unsigned long) frame;
402 regs->regs[31] = (unsigned long) sig_return;
403 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
405 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
406 current->comm, current->pid,
407 frame, regs->cp0_epc, regs->regs[31]);
411 force_sigsegv(signr, current);
416 static int setup_rt_frame(void *sig_return, struct k_sigaction *ka,
417 struct pt_regs *regs, int signr, sigset_t *set,
420 struct rt_sigframe __user *frame;
423 frame = get_sigframe(ka, regs, sizeof(*frame));
424 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
427 /* Create siginfo. */
428 err |= copy_siginfo_to_user(&frame->rs_info, info);
430 /* Create the ucontext. */
431 err |= __put_user(0, &frame->rs_uc.uc_flags);
432 err |= __put_user(NULL, &frame->rs_uc.uc_link);
433 err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
434 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
435 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
441 * Arguments to signal handler:
444 * a1 = 0 (should be cause)
445 * a2 = pointer to ucontext
447 * $25 and c0_epc point to the signal handler, $29 points to
448 * the struct rt_sigframe.
450 regs->regs[ 4] = signr;
451 regs->regs[ 5] = (unsigned long) &frame->rs_info;
452 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
453 regs->regs[29] = (unsigned long) frame;
454 regs->regs[31] = (unsigned long) sig_return;
455 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
457 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
458 current->comm, current->pid,
459 frame, regs->cp0_epc, regs->regs[31]);
464 force_sigsegv(signr, current);
468 struct mips_abi mips_abi = {
469 #ifdef CONFIG_TRAD_SIGNALS
470 .setup_frame = setup_frame,
471 .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline),
473 .setup_rt_frame = setup_rt_frame,
474 .rt_signal_return_offset =
475 offsetof(struct mips_vdso, rt_signal_trampoline),
476 .restart = __NR_restart_syscall
479 static void handle_signal(unsigned long sig, siginfo_t *info,
480 struct k_sigaction *ka, struct pt_regs *regs)
482 sigset_t *oldset = sigmask_to_save();
484 struct mips_abi *abi = current->thread.abi;
485 #ifdef CONFIG_CPU_MICROMIPS
487 unsigned int tmp = (unsigned int)current->mm->context.vdso;
492 void *vdso = current->mm->context.vdso;
496 switch(regs->regs[2]) {
497 case ERESTART_RESTARTBLOCK:
499 regs->regs[2] = EINTR;
502 if (!(ka->sa.sa_flags & SA_RESTART)) {
503 regs->regs[2] = EINTR;
508 regs->regs[7] = regs->regs[26];
509 regs->regs[2] = regs->regs[0];
513 regs->regs[0] = 0; /* Don't deal with this again. */
516 if (sig_uses_siginfo(ka))
517 ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset,
518 ka, regs, sig, oldset, info);
520 ret = abi->setup_frame(vdso + abi->signal_return_offset,
521 ka, regs, sig, oldset);
526 signal_delivered(sig, info, ka, regs, 0);
529 static void do_signal(struct pt_regs *regs)
531 struct k_sigaction ka;
535 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
537 /* Whee! Actually deliver the signal. */
538 handle_signal(signr, &info, &ka, regs);
543 switch (regs->regs[2]) {
547 regs->regs[2] = regs->regs[0];
548 regs->regs[7] = regs->regs[26];
552 case ERESTART_RESTARTBLOCK:
553 regs->regs[2] = current->thread.abi->restart;
554 regs->regs[7] = regs->regs[26];
558 regs->regs[0] = 0; /* Don't deal with this again. */
562 * If there's no signal to deliver, we just put the saved sigmask
565 restore_saved_sigmask();
569 * notification of userspace execution resumption
570 * - triggered by the TIF_WORK_MASK flags
572 asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
573 __u32 thread_info_flags)
579 /* deal with pending signal delivery */
580 if (thread_info_flags & _TIF_SIGPENDING)
583 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
584 clear_thread_flag(TIF_NOTIFY_RESUME);
585 tracehook_notify_resume(regs);
592 static int smp_save_fp_context(struct sigcontext __user *sc)
594 return raw_cpu_has_fpu
595 ? _save_fp_context(sc)
596 : fpu_emulator_save_context(sc);
599 static int smp_restore_fp_context(struct sigcontext __user *sc)
601 return raw_cpu_has_fpu
602 ? _restore_fp_context(sc)
603 : fpu_emulator_restore_context(sc);
607 static int signal_setup(void)
610 /* For now just do the cpu_has_fpu check when the functions are invoked */
611 save_fp_context = smp_save_fp_context;
612 restore_fp_context = smp_restore_fp_context;
615 save_fp_context = _save_fp_context;
616 restore_fp_context = _restore_fp_context;
618 save_fp_context = fpu_emulator_save_context;
619 restore_fp_context = fpu_emulator_restore_context;
626 arch_initcall(signal_setup);