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/irqflags.h>
12 #include <linux/sched.h>
14 #include <linux/personality.h>
15 #include <linux/smp.h>
16 #include <linux/kernel.h>
17 #include <linux/signal.h>
18 #include <linux/errno.h>
19 #include <linux/wait.h>
20 #include <linux/ptrace.h>
21 #include <linux/unistd.h>
22 #include <linux/compiler.h>
23 #include <linux/syscalls.h>
24 #include <linux/uaccess.h>
25 #include <linux/tracehook.h>
29 #include <linux/bitops.h>
30 #include <asm/cacheflush.h>
33 #include <asm/ucontext.h>
34 #include <asm/cpu-features.h>
39 #include "signal-common.h"
41 static int (*save_fp_context
)(struct sigcontext __user
*sc
);
42 static int (*restore_fp_context
)(struct sigcontext __user
*sc
);
44 extern asmlinkage
int _save_fp_context(struct sigcontext __user
*sc
);
45 extern asmlinkage
int _restore_fp_context(struct sigcontext __user
*sc
);
47 extern asmlinkage
int fpu_emulator_save_context(struct sigcontext __user
*sc
);
48 extern asmlinkage
int fpu_emulator_restore_context(struct sigcontext __user
*sc
);
51 u32 sf_ass
[4]; /* argument save space for o32 */
52 u32 sf_pad
[2]; /* Was: signal trampoline */
53 struct sigcontext sf_sc
;
58 u32 rs_ass
[4]; /* argument save space for o32 */
59 u32 rs_pad
[2]; /* Was: signal trampoline */
60 struct siginfo rs_info
;
61 struct ucontext rs_uc
;
67 static int protected_save_fp_context(struct sigcontext __user
*sc
)
73 err
= save_fp_context(sc
); /* this might fail */
77 /* touch the sigcontext and try again */
78 err
= __put_user(0, &sc
->sc_fpregs
[0]) |
79 __put_user(0, &sc
->sc_fpregs
[31]) |
80 __put_user(0, &sc
->sc_fpc_csr
);
82 break; /* really bad sigcontext */
87 static int protected_restore_fp_context(struct sigcontext __user
*sc
)
89 int err
, tmp __maybe_unused
;
93 err
= restore_fp_context(sc
); /* this might fail */
97 /* touch the sigcontext and try again */
98 err
= __get_user(tmp
, &sc
->sc_fpregs
[0]) |
99 __get_user(tmp
, &sc
->sc_fpregs
[31]) |
100 __get_user(tmp
, &sc
->sc_fpc_csr
);
102 break; /* really bad sigcontext */
107 int setup_sigcontext(struct pt_regs
*regs
, struct sigcontext __user
*sc
)
111 unsigned int used_math
;
113 err
|= __put_user(regs
->cp0_epc
, &sc
->sc_pc
);
115 err
|= __put_user(0, &sc
->sc_regs
[0]);
116 for (i
= 1; i
< 32; i
++)
117 err
|= __put_user(regs
->regs
[i
], &sc
->sc_regs
[i
]);
119 #ifdef CONFIG_CPU_HAS_SMARTMIPS
120 err
|= __put_user(regs
->acx
, &sc
->sc_acx
);
122 err
|= __put_user(regs
->hi
, &sc
->sc_mdhi
);
123 err
|= __put_user(regs
->lo
, &sc
->sc_mdlo
);
125 err
|= __put_user(mfhi1(), &sc
->sc_hi1
);
126 err
|= __put_user(mflo1(), &sc
->sc_lo1
);
127 err
|= __put_user(mfhi2(), &sc
->sc_hi2
);
128 err
|= __put_user(mflo2(), &sc
->sc_lo2
);
129 err
|= __put_user(mfhi3(), &sc
->sc_hi3
);
130 err
|= __put_user(mflo3(), &sc
->sc_lo3
);
131 err
|= __put_user(rddsp(DSP_MASK
), &sc
->sc_dsp
);
134 used_math
= !!used_math();
135 err
|= __put_user(used_math
, &sc
->sc_used_math
);
139 * Save FPU state to signal context. Signal handler
140 * will "inherit" current FPU state.
142 err
|= protected_save_fp_context(sc
);
147 int fpcsr_pending(unsigned int __user
*fpcsr
)
150 unsigned int csr
, enabled
;
152 err
= __get_user(csr
, fpcsr
);
153 enabled
= FPU_CSR_UNI_X
| ((csr
& FPU_CSR_ALL_E
) << 5);
155 * If the signal handler set some FPU exceptions, clear it and
160 err
|= __put_user(csr
, fpcsr
);
167 check_and_restore_fp_context(struct sigcontext __user
*sc
)
171 err
= sig
= fpcsr_pending(&sc
->sc_fpc_csr
);
174 err
|= protected_restore_fp_context(sc
);
178 int restore_sigcontext(struct pt_regs
*regs
, struct sigcontext __user
*sc
)
180 unsigned int used_math
;
185 /* Always make any pending restarted system calls return -EINTR */
186 current_thread_info()->restart_block
.fn
= do_no_restart_syscall
;
188 err
|= __get_user(regs
->cp0_epc
, &sc
->sc_pc
);
190 #ifdef CONFIG_CPU_HAS_SMARTMIPS
191 err
|= __get_user(regs
->acx
, &sc
->sc_acx
);
193 err
|= __get_user(regs
->hi
, &sc
->sc_mdhi
);
194 err
|= __get_user(regs
->lo
, &sc
->sc_mdlo
);
196 err
|= __get_user(treg
, &sc
->sc_hi1
); mthi1(treg
);
197 err
|= __get_user(treg
, &sc
->sc_lo1
); mtlo1(treg
);
198 err
|= __get_user(treg
, &sc
->sc_hi2
); mthi2(treg
);
199 err
|= __get_user(treg
, &sc
->sc_lo2
); mtlo2(treg
);
200 err
|= __get_user(treg
, &sc
->sc_hi3
); mthi3(treg
);
201 err
|= __get_user(treg
, &sc
->sc_lo3
); mtlo3(treg
);
202 err
|= __get_user(treg
, &sc
->sc_dsp
); wrdsp(treg
, DSP_MASK
);
205 for (i
= 1; i
< 32; i
++)
206 err
|= __get_user(regs
->regs
[i
], &sc
->sc_regs
[i
]);
208 err
|= __get_user(used_math
, &sc
->sc_used_math
);
209 conditional_used_math(used_math
);
212 /* restore fpu context if we have used it before */
214 err
= check_and_restore_fp_context(sc
);
216 /* signal handler may have used FPU. Give it up. */
223 void __user
*get_sigframe(struct k_sigaction
*ka
, struct pt_regs
*regs
,
228 /* Default to using normal stack */
232 * FPU emulator may have it's own trampoline active just
233 * above the user stack, 16-bytes before the next lowest
234 * 16 byte boundary. Try to avoid trashing it.
238 /* This is the X/Open sanctioned signal stack switching. */
239 if ((ka
->sa
.sa_flags
& SA_ONSTACK
) && (sas_ss_flags (sp
) == 0))
240 sp
= current
->sas_ss_sp
+ current
->sas_ss_size
;
242 return (void __user
*)((sp
- frame_size
) & (ICACHE_REFILLS_WORKAROUND_WAR
? ~(cpu_icache_line_size()-1) : ALMASK
));
246 * Atomically swap in the new signal mask, and wait for a signal.
249 #ifdef CONFIG_TRAD_SIGNALS
250 SYSCALL_DEFINE1(sigsuspend
, sigset_t __user
*, uset
)
252 return sys_rt_sigsuspend(uset
, sizeof(sigset_t
));
256 #ifdef CONFIG_TRAD_SIGNALS
257 SYSCALL_DEFINE3(sigaction
, int, sig
, const struct sigaction __user
*, act
,
258 struct sigaction __user
*, oact
)
260 struct k_sigaction new_ka
, old_ka
;
267 if (!access_ok(VERIFY_READ
, act
, sizeof(*act
)))
269 err
|= __get_user(new_ka
.sa
.sa_handler
, &act
->sa_handler
);
270 err
|= __get_user(new_ka
.sa
.sa_flags
, &act
->sa_flags
);
271 err
|= __get_user(mask
, &act
->sa_mask
.sig
[0]);
275 siginitset(&new_ka
.sa
.sa_mask
, mask
);
278 ret
= do_sigaction(sig
, act
? &new_ka
: NULL
, oact
? &old_ka
: NULL
);
281 if (!access_ok(VERIFY_WRITE
, oact
, sizeof(*oact
)))
283 err
|= __put_user(old_ka
.sa
.sa_flags
, &oact
->sa_flags
);
284 err
|= __put_user(old_ka
.sa
.sa_handler
, &oact
->sa_handler
);
285 err
|= __put_user(old_ka
.sa
.sa_mask
.sig
[0], oact
->sa_mask
.sig
);
286 err
|= __put_user(0, &oact
->sa_mask
.sig
[1]);
287 err
|= __put_user(0, &oact
->sa_mask
.sig
[2]);
288 err
|= __put_user(0, &oact
->sa_mask
.sig
[3]);
297 #ifdef CONFIG_TRAD_SIGNALS
298 asmlinkage
void sys_sigreturn(nabi_no_regargs
struct pt_regs regs
)
300 struct sigframe __user
*frame
;
304 frame
= (struct sigframe __user
*) regs
.regs
[29];
305 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
307 if (__copy_from_user(&blocked
, &frame
->sf_mask
, sizeof(blocked
)))
310 set_current_blocked(&blocked
);
312 sig
= restore_sigcontext(®s
, &frame
->sf_sc
);
316 force_sig(sig
, current
);
319 * Don't let your children do this ...
321 __asm__
__volatile__(
329 force_sig(SIGSEGV
, current
);
331 #endif /* CONFIG_TRAD_SIGNALS */
333 asmlinkage
void sys_rt_sigreturn(nabi_no_regargs
struct pt_regs regs
)
335 struct rt_sigframe __user
*frame
;
339 frame
= (struct rt_sigframe __user
*) regs
.regs
[29];
340 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
342 if (__copy_from_user(&set
, &frame
->rs_uc
.uc_sigmask
, sizeof(set
)))
345 set_current_blocked(&set
);
347 sig
= restore_sigcontext(®s
, &frame
->rs_uc
.uc_mcontext
);
351 force_sig(sig
, current
);
353 if (restore_altstack(&frame
->rs_uc
.uc_stack
))
357 * Don't let your children do this ...
359 __asm__
__volatile__(
367 force_sig(SIGSEGV
, current
);
370 #ifdef CONFIG_TRAD_SIGNALS
371 static int setup_frame(void *sig_return
, struct k_sigaction
*ka
,
372 struct pt_regs
*regs
, int signr
, sigset_t
*set
)
374 struct sigframe __user
*frame
;
377 frame
= get_sigframe(ka
, regs
, sizeof(*frame
));
378 if (!access_ok(VERIFY_WRITE
, frame
, sizeof (*frame
)))
381 err
|= setup_sigcontext(regs
, &frame
->sf_sc
);
382 err
|= __copy_to_user(&frame
->sf_mask
, set
, sizeof(*set
));
387 * Arguments to signal handler:
390 * a1 = 0 (should be cause)
391 * a2 = pointer to struct sigcontext
393 * $25 and c0_epc point to the signal handler, $29 points to the
396 regs
->regs
[ 4] = signr
;
398 regs
->regs
[ 6] = (unsigned long) &frame
->sf_sc
;
399 regs
->regs
[29] = (unsigned long) frame
;
400 regs
->regs
[31] = (unsigned long) sig_return
;
401 regs
->cp0_epc
= regs
->regs
[25] = (unsigned long) ka
->sa
.sa_handler
;
403 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
404 current
->comm
, current
->pid
,
405 frame
, regs
->cp0_epc
, regs
->regs
[31]);
409 force_sigsegv(signr
, current
);
414 static int setup_rt_frame(void *sig_return
, struct k_sigaction
*ka
,
415 struct pt_regs
*regs
, int signr
, sigset_t
*set
,
418 struct rt_sigframe __user
*frame
;
421 frame
= get_sigframe(ka
, regs
, sizeof(*frame
));
422 if (!access_ok(VERIFY_WRITE
, frame
, sizeof (*frame
)))
425 /* Create siginfo. */
426 err
|= copy_siginfo_to_user(&frame
->rs_info
, info
);
428 /* Create the ucontext. */
429 err
|= __put_user(0, &frame
->rs_uc
.uc_flags
);
430 err
|= __put_user(NULL
, &frame
->rs_uc
.uc_link
);
431 err
|= __save_altstack(&frame
->rs_uc
.uc_stack
, regs
->regs
[29]);
432 err
|= setup_sigcontext(regs
, &frame
->rs_uc
.uc_mcontext
);
433 err
|= __copy_to_user(&frame
->rs_uc
.uc_sigmask
, set
, sizeof(*set
));
439 * Arguments to signal handler:
442 * a1 = 0 (should be cause)
443 * a2 = pointer to ucontext
445 * $25 and c0_epc point to the signal handler, $29 points to
446 * the struct rt_sigframe.
448 regs
->regs
[ 4] = signr
;
449 regs
->regs
[ 5] = (unsigned long) &frame
->rs_info
;
450 regs
->regs
[ 6] = (unsigned long) &frame
->rs_uc
;
451 regs
->regs
[29] = (unsigned long) frame
;
452 regs
->regs
[31] = (unsigned long) sig_return
;
453 regs
->cp0_epc
= regs
->regs
[25] = (unsigned long) ka
->sa
.sa_handler
;
455 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
456 current
->comm
, current
->pid
,
457 frame
, regs
->cp0_epc
, regs
->regs
[31]);
462 force_sigsegv(signr
, current
);
466 struct mips_abi mips_abi
= {
467 #ifdef CONFIG_TRAD_SIGNALS
468 .setup_frame
= setup_frame
,
469 .signal_return_offset
= offsetof(struct mips_vdso
, signal_trampoline
),
471 .setup_rt_frame
= setup_rt_frame
,
472 .rt_signal_return_offset
=
473 offsetof(struct mips_vdso
, rt_signal_trampoline
),
474 .restart
= __NR_restart_syscall
477 static void handle_signal(unsigned long sig
, siginfo_t
*info
,
478 struct k_sigaction
*ka
, struct pt_regs
*regs
)
480 sigset_t
*oldset
= sigmask_to_save();
482 struct mips_abi
*abi
= current
->thread
.abi
;
483 void *vdso
= current
->mm
->context
.vdso
;
486 switch(regs
->regs
[2]) {
487 case ERESTART_RESTARTBLOCK
:
489 regs
->regs
[2] = EINTR
;
492 if (!(ka
->sa
.sa_flags
& SA_RESTART
)) {
493 regs
->regs
[2] = EINTR
;
498 regs
->regs
[7] = regs
->regs
[26];
499 regs
->regs
[2] = regs
->regs
[0];
503 regs
->regs
[0] = 0; /* Don't deal with this again. */
506 if (sig_uses_siginfo(ka
))
507 ret
= abi
->setup_rt_frame(vdso
+ abi
->rt_signal_return_offset
,
508 ka
, regs
, sig
, oldset
, info
);
510 ret
= abi
->setup_frame(vdso
+ abi
->signal_return_offset
,
511 ka
, regs
, sig
, oldset
);
516 signal_delivered(sig
, info
, ka
, regs
, 0);
519 static void do_signal(struct pt_regs
*regs
)
521 struct k_sigaction ka
;
525 signr
= get_signal_to_deliver(&info
, &ka
, regs
, NULL
);
527 /* Whee! Actually deliver the signal. */
528 handle_signal(signr
, &info
, &ka
, regs
);
533 switch (regs
->regs
[2]) {
537 regs
->regs
[2] = regs
->regs
[0];
538 regs
->regs
[7] = regs
->regs
[26];
542 case ERESTART_RESTARTBLOCK
:
543 regs
->regs
[2] = current
->thread
.abi
->restart
;
544 regs
->regs
[7] = regs
->regs
[26];
548 regs
->regs
[0] = 0; /* Don't deal with this again. */
552 * If there's no signal to deliver, we just put the saved sigmask
555 restore_saved_sigmask();
559 * notification of userspace execution resumption
560 * - triggered by the TIF_WORK_MASK flags
562 asmlinkage
void do_notify_resume(struct pt_regs
*regs
, void *unused
,
563 __u32 thread_info_flags
)
567 /* deal with pending signal delivery */
568 if (thread_info_flags
& _TIF_SIGPENDING
)
571 if (thread_info_flags
& _TIF_NOTIFY_RESUME
) {
572 clear_thread_flag(TIF_NOTIFY_RESUME
);
573 tracehook_notify_resume(regs
);
578 static int smp_save_fp_context(struct sigcontext __user
*sc
)
580 return raw_cpu_has_fpu
581 ? _save_fp_context(sc
)
582 : fpu_emulator_save_context(sc
);
585 static int smp_restore_fp_context(struct sigcontext __user
*sc
)
587 return raw_cpu_has_fpu
588 ? _restore_fp_context(sc
)
589 : fpu_emulator_restore_context(sc
);
593 static int signal_setup(void)
596 /* For now just do the cpu_has_fpu check when the functions are invoked */
597 save_fp_context
= smp_save_fp_context
;
598 restore_fp_context
= smp_restore_fp_context
;
601 save_fp_context
= _save_fp_context
;
602 restore_fp_context
= _restore_fp_context
;
604 save_fp_context
= fpu_emulator_save_context
;
605 restore_fp_context
= fpu_emulator_restore_context
;
612 arch_initcall(signal_setup
);