2 * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Copyright (C) 2001 IBM
7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
10 * Derived from "arch/i386/kernel/signal.c"
11 * Copyright (C) 1991, 1992 Linus Torvalds
12 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
20 #include <linux/config.h>
21 #include <linux/sched.h>
23 #include <linux/smp.h>
24 #include <linux/smp_lock.h>
25 #include <linux/kernel.h>
26 #include <linux/signal.h>
27 #include <linux/errno.h>
28 #include <linux/elf.h>
30 #include <linux/syscalls.h>
31 #include <linux/compat.h>
32 #include <linux/ptrace.h>
34 #include <linux/wait.h>
35 #include <linux/ptrace.h>
36 #include <linux/unistd.h>
37 #include <linux/stddef.h>
38 #include <linux/tty.h>
39 #include <linux/binfmts.h>
40 #include <linux/suspend.h>
43 #include <asm/uaccess.h>
44 #include <asm/cacheflush.h>
45 #include <asm/sigcontext.h>
49 #include <asm/unistd.h>
51 #include <asm/ucontext.h>
52 #include <asm/pgtable.h>
57 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
60 #define do_signal do_signal32
61 #define sys_sigsuspend compat_sys_sigsuspend
62 #define sys_rt_sigsuspend compat_sys_rt_sigsuspend
63 #define sys_rt_sigreturn compat_sys_rt_sigreturn
64 #define sys_sigaction compat_sys_sigaction
65 #define sys_swapcontext compat_sys_swapcontext
66 #define sys_sigreturn compat_sys_sigreturn
68 #define old_sigaction old_sigaction32
69 #define sigcontext sigcontext32
70 #define mcontext mcontext32
71 #define ucontext ucontext32
74 * Returning 0 means we return to userspace via
75 * ret_from_except and thus restore all user
76 * registers from *regs. This is what we need
77 * to do when a signal has been delivered.
80 #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
81 #undef __SIGNAL_FRAMESIZE
82 #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32
84 #define ELF_NVRREG ELF_NVRREG32
87 * Functions for flipping sigsets (thanks to brain dead generic
88 * implementation that makes things simple for little endian only)
90 static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
94 switch (_NSIG_WORDS) {
95 case 4: cset.sig[5] = set->sig[3] & 0xffffffffull;
96 cset.sig[7] = set->sig[3] >> 32;
97 case 3: cset.sig[4] = set->sig[2] & 0xffffffffull;
98 cset.sig[5] = set->sig[2] >> 32;
99 case 2: cset.sig[2] = set->sig[1] & 0xffffffffull;
100 cset.sig[3] = set->sig[1] >> 32;
101 case 1: cset.sig[0] = set->sig[0] & 0xffffffffull;
102 cset.sig[1] = set->sig[0] >> 32;
104 return copy_to_user(uset, &cset, sizeof(*uset));
107 static inline int get_sigset_t(sigset_t *set,
108 const compat_sigset_t __user *uset)
112 if (copy_from_user(&s32, uset, sizeof(*uset)))
116 * Swap the 2 words of the 64-bit sigset_t (they are stored
117 * in the "wrong" endian in 32-bit user storage).
119 switch (_NSIG_WORDS) {
120 case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
121 case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
122 case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
123 case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
128 static inline int get_old_sigaction(struct k_sigaction *new_ka,
129 struct old_sigaction __user *act)
131 compat_old_sigset_t mask;
132 compat_uptr_t handler, restorer;
134 if (get_user(handler, &act->sa_handler) ||
135 __get_user(restorer, &act->sa_restorer) ||
136 __get_user(new_ka->sa.sa_flags, &act->sa_flags) ||
137 __get_user(mask, &act->sa_mask))
139 new_ka->sa.sa_handler = compat_ptr(handler);
140 new_ka->sa.sa_restorer = compat_ptr(restorer);
141 siginitset(&new_ka->sa.sa_mask, mask);
145 static inline compat_uptr_t to_user_ptr(void *kp)
147 return (compat_uptr_t)(u64)kp;
150 #define from_user_ptr(p) compat_ptr(p)
152 static inline int save_general_regs(struct pt_regs *regs,
153 struct mcontext __user *frame)
155 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
158 if (!FULL_REGS(regs)) {
159 set_thread_flag(TIF_SAVE_NVGPRS);
160 current_thread_info()->nvgprs_frame = frame->mc_gregs;
163 for (i = 0; i <= PT_RESULT; i ++) {
164 if (i == 14 && !FULL_REGS(regs))
166 if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
172 static inline int restore_general_regs(struct pt_regs *regs,
173 struct mcontext __user *sr)
175 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
178 for (i = 0; i <= PT_RESULT; i++) {
179 if ((i == PT_MSR) || (i == PT_SOFTE))
181 if (__get_user(gregs[i], &sr->mc_gregs[i]))
187 #else /* CONFIG_PPC64 */
189 #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
191 static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
193 return copy_to_user(uset, set, sizeof(*uset));
196 static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
198 return copy_from_user(set, uset, sizeof(*uset));
201 static inline int get_old_sigaction(struct k_sigaction *new_ka,
202 struct old_sigaction __user *act)
206 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
207 __get_user(new_ka->sa.sa_handler, &act->sa_handler) ||
208 __get_user(new_ka->sa.sa_restorer, &act->sa_restorer))
210 __get_user(new_ka->sa.sa_flags, &act->sa_flags);
211 __get_user(mask, &act->sa_mask);
212 siginitset(&new_ka->sa.sa_mask, mask);
216 #define to_user_ptr(p) (p)
217 #define from_user_ptr(p) (p)
219 static inline int save_general_regs(struct pt_regs *regs,
220 struct mcontext __user *frame)
222 if (!FULL_REGS(regs)) {
223 /* Zero out the unsaved GPRs to avoid information
224 leak, and set TIF_SAVE_NVGPRS to ensure that the
225 registers do actually get saved later. */
226 memset(®s->gpr[14], 0, 18 * sizeof(unsigned long));
227 current_thread_info()->nvgprs_frame = &frame->mc_gregs;
228 set_thread_flag(TIF_SAVE_NVGPRS);
231 return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
234 static inline int restore_general_regs(struct pt_regs *regs,
235 struct mcontext __user *sr)
237 /* copy up to but not including MSR */
238 if (__copy_from_user(regs, &sr->mc_gregs,
239 PT_MSR * sizeof(elf_greg_t)))
241 /* copy from orig_r3 (the word after the MSR) up to the end */
242 if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
243 GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
248 #endif /* CONFIG_PPC64 */
250 int do_signal(sigset_t *oldset, struct pt_regs *regs);
253 * Atomically swap in the new signal mask, and wait for a signal.
255 long sys_sigsuspend(old_sigset_t mask)
260 spin_lock_irq(¤t->sighand->siglock);
261 saveset = current->blocked;
262 siginitset(¤t->blocked, mask);
264 spin_unlock_irq(¤t->sighand->siglock);
266 current->state = TASK_INTERRUPTIBLE;
268 set_thread_flag(TIF_RESTORE_SIGMASK);
269 return -ERESTARTNOHAND;
273 long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, int r5,
274 int r6, int r7, int r8, struct pt_regs *regs)
276 return do_sigaltstack(uss, uoss, regs->gpr[1]);
280 long sys_sigaction(int sig, struct old_sigaction __user *act,
281 struct old_sigaction __user *oact)
283 struct k_sigaction new_ka, old_ka;
292 if (get_old_sigaction(&new_ka, act))
296 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
298 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
299 __put_user(to_user_ptr(old_ka.sa.sa_handler),
300 &oact->sa_handler) ||
301 __put_user(to_user_ptr(old_ka.sa.sa_restorer),
302 &oact->sa_restorer) ||
303 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
304 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
312 * When we have signals to deliver, we set up on the
313 * user stack, going down from the original stack pointer:
315 * a sigcontext struct
316 * a gap of __SIGNAL_FRAMESIZE bytes
318 * Each of these things must be a multiple of 16 bytes in size.
322 struct mcontext mctx; /* all the register values */
324 * Programs using the rs6000/xcoff abi can save up to 19 gp
325 * regs and 18 fp regs below sp before decrementing it.
330 /* We use the mc_pad field for the signal return trampoline. */
334 * When we have rt signals to deliver, we set up on the
335 * user stack, going down from the original stack pointer:
336 * one rt_sigframe struct (siginfo + ucontext + ABI gap)
337 * a gap of __SIGNAL_FRAMESIZE+16 bytes
338 * (the +16 is to get the siginfo and ucontext in the same
339 * positions as in older kernels).
341 * Each of these things must be a multiple of 16 bytes in size.
346 compat_siginfo_t info;
352 * Programs using the rs6000/xcoff abi can save up to 19 gp
353 * regs and 18 fp regs below sp before decrementing it.
359 * Save the current user registers on the user stack.
360 * We only save the altivec/spe registers if the process has used
361 * altivec/spe instructions at some point.
363 static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
366 /* Make sure floating point registers are stored in regs */
367 flush_fp_to_thread(current);
369 /* save general and floating-point registers */
370 if (save_general_regs(regs, frame) ||
371 __copy_to_user(&frame->mc_fregs, current->thread.fpr,
372 ELF_NFPREG * sizeof(double)))
375 #ifdef CONFIG_ALTIVEC
376 /* save altivec registers */
377 if (current->thread.used_vr) {
378 flush_altivec_to_thread(current);
379 if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
380 ELF_NVRREG * sizeof(vector128)))
382 /* set MSR_VEC in the saved MSR value to indicate that
383 frame->mc_vregs contains valid data */
384 if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR]))
387 /* else assert((regs->msr & MSR_VEC) == 0) */
389 /* We always copy to/from vrsave, it's 0 if we don't have or don't
390 * use altivec. Since VSCR only contains 32 bits saved in the least
391 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
392 * most significant bits of that same vector. --BenH
394 if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
396 #endif /* CONFIG_ALTIVEC */
399 /* save spe registers */
400 if (current->thread.used_spe) {
401 flush_spe_to_thread(current);
402 if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
403 ELF_NEVRREG * sizeof(u32)))
405 /* set MSR_SPE in the saved MSR value to indicate that
406 frame->mc_vregs contains valid data */
407 if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR]))
410 /* else assert((regs->msr & MSR_SPE) == 0) */
412 /* We always copy to/from spefscr */
413 if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
415 #endif /* CONFIG_SPE */
418 /* Set up the sigreturn trampoline: li r0,sigret; sc */
419 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
420 || __put_user(0x44000002UL, &frame->tramp[1]))
422 flush_icache_range((unsigned long) &frame->tramp[0],
423 (unsigned long) &frame->tramp[2]);
430 * Restore the current user register values from the user stack,
433 static long restore_user_regs(struct pt_regs *regs,
434 struct mcontext __user *sr, int sig)
437 unsigned int save_r2 = 0;
438 #if defined(CONFIG_ALTIVEC) || defined(CONFIG_SPE)
443 * restore general registers but not including MSR or SOFTE. Also
444 * take care of keeping r2 (TLS) intact if not a signal
447 save_r2 = (unsigned int)regs->gpr[2];
448 err = restore_general_regs(regs, sr);
450 regs->gpr[2] = (unsigned long) save_r2;
455 * Do this before updating the thread state in
456 * current->thread.fpr/vr/evr. That way, if we get preempted
457 * and another task grabs the FPU/Altivec/SPE, it won't be
458 * tempted to save the current CPU state into the thread_struct
459 * and corrupt what we are writing there.
461 discard_lazy_cpu_state();
463 /* force the process to reload the FP registers from
464 current->thread when it next does FP instructions */
465 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
466 if (__copy_from_user(current->thread.fpr, &sr->mc_fregs,
467 sizeof(sr->mc_fregs)))
470 #ifdef CONFIG_ALTIVEC
471 /* force the process to reload the altivec registers from
472 current->thread when it next does altivec instructions */
473 regs->msr &= ~MSR_VEC;
474 if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_VEC) != 0) {
475 /* restore altivec registers from the stack */
476 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
477 sizeof(sr->mc_vregs)))
479 } else if (current->thread.used_vr)
480 memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));
482 /* Always get VRSAVE back */
483 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
485 #endif /* CONFIG_ALTIVEC */
488 /* force the process to reload the spe registers from
489 current->thread when it next does spe instructions */
490 regs->msr &= ~MSR_SPE;
491 if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_SPE) != 0) {
492 /* restore spe registers from the stack */
493 if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
494 ELF_NEVRREG * sizeof(u32)))
496 } else if (current->thread.used_spe)
497 memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
499 /* Always get SPEFSCR back */
500 if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
502 #endif /* CONFIG_SPE */
508 long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act,
509 struct sigaction32 __user *oact, size_t sigsetsize)
511 struct k_sigaction new_ka, old_ka;
514 /* XXX: Don't preclude handling different sized sigset_t's. */
515 if (sigsetsize != sizeof(compat_sigset_t))
519 compat_uptr_t handler;
521 ret = get_user(handler, &act->sa_handler);
522 new_ka.sa.sa_handler = compat_ptr(handler);
523 ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
524 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
529 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
531 ret = put_user((long)old_ka.sa.sa_handler, &oact->sa_handler);
532 ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
533 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
539 * Note: it is necessary to treat how as an unsigned int, with the
540 * corresponding cast to a signed int to insure that the proper
541 * conversion (sign extension) between the register representation
542 * of a signed int (msr in 32-bit mode) and the register representation
543 * of a signed int (msr in 64-bit mode) is performed.
545 long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set,
546 compat_sigset_t __user *oset, size_t sigsetsize)
551 mm_segment_t old_fs = get_fs();
554 if (get_sigset_t(&s, set))
559 /* This is valid because of the set_fs() */
560 up = (sigset_t __user *) &s;
561 ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL,
567 if (put_sigset_t(oset, &s))
573 long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
577 mm_segment_t old_fs = get_fs();
580 /* The __user pointer cast is valid because of the set_fs() */
581 ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
584 if (put_sigset_t(set, &s))
591 int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s)
595 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
598 /* If you change siginfo_t structure, please be sure
599 * this code is fixed accordingly.
600 * It should never copy any pad contained in the structure
601 * to avoid security leaks, but must copy the generic
602 * 3 ints plus the relevant union member.
603 * This routine must convert siginfo from 64bit to 32bit as well
606 err = __put_user(s->si_signo, &d->si_signo);
607 err |= __put_user(s->si_errno, &d->si_errno);
608 err |= __put_user((short)s->si_code, &d->si_code);
610 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
612 else switch(s->si_code >> 16) {
613 case __SI_CHLD >> 16:
614 err |= __put_user(s->si_pid, &d->si_pid);
615 err |= __put_user(s->si_uid, &d->si_uid);
616 err |= __put_user(s->si_utime, &d->si_utime);
617 err |= __put_user(s->si_stime, &d->si_stime);
618 err |= __put_user(s->si_status, &d->si_status);
620 case __SI_FAULT >> 16:
621 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
624 case __SI_POLL >> 16:
625 err |= __put_user(s->si_band, &d->si_band);
626 err |= __put_user(s->si_fd, &d->si_fd);
628 case __SI_TIMER >> 16:
629 err |= __put_user(s->si_tid, &d->si_tid);
630 err |= __put_user(s->si_overrun, &d->si_overrun);
631 err |= __put_user(s->si_int, &d->si_int);
633 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
634 case __SI_MESGQ >> 16:
635 err |= __put_user(s->si_int, &d->si_int);
637 case __SI_KILL >> 16:
639 err |= __put_user(s->si_pid, &d->si_pid);
640 err |= __put_user(s->si_uid, &d->si_uid);
646 #define copy_siginfo_to_user copy_siginfo_to_user32
649 * Note: it is necessary to treat pid and sig as unsigned ints, with the
650 * corresponding cast to a signed int to insure that the proper conversion
651 * (sign extension) between the register representation of a signed int
652 * (msr in 32-bit mode) and the register representation of a signed int
653 * (msr in 64-bit mode) is performed.
655 long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo)
659 mm_segment_t old_fs = get_fs();
661 if (copy_from_user (&info, uinfo, 3*sizeof(int)) ||
662 copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32))
665 /* The __user pointer cast is valid becasuse of the set_fs() */
666 ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info);
671 * Start Alternate signal stack support
674 * sigaltatck compat_sys_sigaltstack
677 int compat_sys_sigaltstack(u32 __new, u32 __old, int r5,
678 int r6, int r7, int r8, struct pt_regs *regs)
680 stack_32_t __user * newstack = (stack_32_t __user *)(long) __new;
681 stack_32_t __user * oldstack = (stack_32_t __user *)(long) __old;
689 * set sp to the user stack on entry to the system call
690 * the system call router sets R9 to the saved registers
694 /* Put new stack info in local 64 bit stack struct */
696 if (get_user(ss_sp, &newstack->ss_sp) ||
697 __get_user(uss.ss_flags, &newstack->ss_flags) ||
698 __get_user(uss.ss_size, &newstack->ss_size))
700 uss.ss_sp = compat_ptr(ss_sp);
705 /* The __user pointer casts are valid because of the set_fs() */
706 ret = do_sigaltstack(
707 newstack ? (stack_t __user *) &uss : NULL,
708 oldstack ? (stack_t __user *) &uoss : NULL,
711 /* Copy the stack information to the user output buffer */
712 if (!ret && oldstack &&
713 (put_user((long)uoss.ss_sp, &oldstack->ss_sp) ||
714 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
715 __put_user(uoss.ss_size, &oldstack->ss_size)))
719 #endif /* CONFIG_PPC64 */
723 * Restore the user process's signal mask
726 extern void restore_sigmask(sigset_t *set);
727 #else /* CONFIG_PPC64 */
728 static void restore_sigmask(sigset_t *set)
730 sigdelsetmask(set, ~_BLOCKABLE);
731 spin_lock_irq(¤t->sighand->siglock);
732 current->blocked = *set;
734 spin_unlock_irq(¤t->sighand->siglock);
739 * Set up a signal frame for a "real-time" signal handler
740 * (one which gets siginfo).
742 static int handle_rt_signal(unsigned long sig, struct k_sigaction *ka,
743 siginfo_t *info, sigset_t *oldset,
744 struct pt_regs *regs, unsigned long newsp)
746 struct rt_sigframe __user *rt_sf;
747 struct mcontext __user *frame;
748 unsigned long origsp = newsp;
750 /* Set up Signal Frame */
751 /* Put a Real Time Context onto stack */
752 newsp -= sizeof(*rt_sf);
753 rt_sf = (struct rt_sigframe __user *)newsp;
755 /* create a stack frame for the caller of the handler */
756 newsp -= __SIGNAL_FRAMESIZE + 16;
758 if (!access_ok(VERIFY_WRITE, (void __user *)newsp, origsp - newsp))
761 /* Put the siginfo & fill in most of the ucontext */
762 if (copy_siginfo_to_user(&rt_sf->info, info)
763 || __put_user(0, &rt_sf->uc.uc_flags)
764 || __put_user(0, &rt_sf->uc.uc_link)
765 || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
766 || __put_user(sas_ss_flags(regs->gpr[1]),
767 &rt_sf->uc.uc_stack.ss_flags)
768 || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)
769 || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
771 || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
774 /* Save user registers on the stack */
775 frame = &rt_sf->uc.uc_mcontext;
776 if (vdso32_rt_sigtramp && current->thread.vdso_base) {
777 if (save_user_regs(regs, frame, 0))
779 regs->link = current->thread.vdso_base + vdso32_rt_sigtramp;
781 if (save_user_regs(regs, frame, __NR_rt_sigreturn))
783 regs->link = (unsigned long) frame->tramp;
786 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
788 if (put_user(regs->gpr[1], (u32 __user *)newsp))
790 regs->gpr[1] = newsp;
792 regs->gpr[4] = (unsigned long) &rt_sf->info;
793 regs->gpr[5] = (unsigned long) &rt_sf->uc;
794 regs->gpr[6] = (unsigned long) rt_sf;
795 regs->nip = (unsigned long) ka->sa.sa_handler;
801 printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
804 force_sigsegv(sig, current);
808 static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
811 struct mcontext __user *mcp;
813 if (get_sigset_t(&set, &ucp->uc_sigmask))
819 if (__get_user(cmcp, &ucp->uc_regs))
821 mcp = (struct mcontext __user *)(u64)cmcp;
824 if (__get_user(mcp, &ucp->uc_regs))
827 restore_sigmask(&set);
828 if (restore_user_regs(regs, mcp, sig))
834 long sys_swapcontext(struct ucontext __user *old_ctx,
835 struct ucontext __user *new_ctx,
836 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
840 /* Context size is for future use. Right now, we only make sure
841 * we are passed something we understand
843 if (ctx_size < sizeof(struct ucontext))
846 if (old_ctx != NULL) {
847 if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
848 || save_user_regs(regs, &old_ctx->uc_mcontext, 0)
849 || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
850 || __put_user(to_user_ptr(&old_ctx->uc_mcontext),
856 if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx))
857 || __get_user(tmp, (u8 __user *) new_ctx)
858 || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1))
862 * If we get a fault copying the context into the kernel's
863 * image of the user's registers, we can't just return -EFAULT
864 * because the user's registers will be corrupted. For instance
865 * the NIP value may have been updated but not some of the
866 * other registers. Given that we have done the access_ok
867 * and successfully read the first and last bytes of the region
868 * above, this should only happen in an out-of-memory situation
869 * or if another thread unmaps the region containing the context.
870 * We kill the task with a SIGSEGV in this situation.
872 if (do_setcontext(new_ctx, regs, 0))
875 set_thread_flag(TIF_RESTOREALL);
879 long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
880 struct pt_regs *regs)
882 struct rt_sigframe __user *rt_sf;
884 /* Always make any pending restarted system calls return -EINTR */
885 current_thread_info()->restart_block.fn = do_no_restart_syscall;
887 rt_sf = (struct rt_sigframe __user *)
888 (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
889 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
891 if (do_setcontext(&rt_sf->uc, regs, 1))
895 * It's not clear whether or why it is desirable to save the
896 * sigaltstack setting on signal delivery and restore it on
897 * signal return. But other architectures do this and we have
898 * always done it up until now so it is probably better not to
899 * change it. -- paulus
903 * We use the compat_sys_ version that does the 32/64 bits conversion
904 * and takes userland pointer directly. What about error checking ?
907 compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs);
909 do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]);
911 set_thread_flag(TIF_RESTOREALL);
915 force_sig(SIGSEGV, current);
920 int sys_debug_setcontext(struct ucontext __user *ctx,
921 int ndbg, struct sig_dbg_op __user *dbg,
922 int r6, int r7, int r8,
923 struct pt_regs *regs)
925 struct sig_dbg_op op;
927 unsigned long new_msr = regs->msr;
928 #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
929 unsigned long new_dbcr0 = current->thread.dbcr0;
932 for (i=0; i<ndbg; i++) {
933 if (__copy_from_user(&op, dbg, sizeof(op)))
935 switch (op.dbg_type) {
936 case SIG_DBG_SINGLE_STEPPING:
937 #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
940 new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
943 new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC);
952 case SIG_DBG_BRANCH_TRACING:
953 #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
968 /* We wait until here to actually install the values in the
969 registers so if we fail in the above loop, it will not
970 affect the contents of these registers. After this point,
971 failure is a problem, anyway, and it's very unlikely unless
972 the user is really doing something wrong. */
974 #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
975 current->thread.dbcr0 = new_dbcr0;
979 * If we get a fault copying the context into the kernel's
980 * image of the user's registers, we can't just return -EFAULT
981 * because the user's registers will be corrupted. For instance
982 * the NIP value may have been updated but not some of the
983 * other registers. Given that we have done the access_ok
984 * and successfully read the first and last bytes of the region
985 * above, this should only happen in an out-of-memory situation
986 * or if another thread unmaps the region containing the context.
987 * We kill the task with a SIGSEGV in this situation.
989 if (do_setcontext(ctx, regs, 1)) {
990 force_sig(SIGSEGV, current);
995 * It's not clear whether or why it is desirable to save the
996 * sigaltstack setting on signal delivery and restore it on
997 * signal return. But other architectures do this and we have
998 * always done it up until now so it is probably better not to
999 * change it. -- paulus
1001 do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]);
1003 set_thread_flag(TIF_RESTOREALL);
1010 * OK, we're invoking a handler
1012 static int handle_signal(unsigned long sig, struct k_sigaction *ka,
1013 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs,
1014 unsigned long newsp)
1016 struct sigcontext __user *sc;
1017 struct sigregs __user *frame;
1018 unsigned long origsp = newsp;
1020 /* Set up Signal Frame */
1021 newsp -= sizeof(struct sigregs);
1022 frame = (struct sigregs __user *) newsp;
1024 /* Put a sigcontext on the stack */
1025 newsp -= sizeof(*sc);
1026 sc = (struct sigcontext __user *) newsp;
1028 /* create a stack frame for the caller of the handler */
1029 newsp -= __SIGNAL_FRAMESIZE;
1031 if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp))
1035 #error "Please adjust handle_signal()"
1037 if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler)
1038 || __put_user(oldset->sig[0], &sc->oldmask)
1040 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1042 || __put_user(oldset->sig[1], &sc->_unused[3])
1044 || __put_user(to_user_ptr(frame), &sc->regs)
1045 || __put_user(sig, &sc->signal))
1048 if (vdso32_sigtramp && current->thread.vdso_base) {
1049 if (save_user_regs(regs, &frame->mctx, 0))
1051 regs->link = current->thread.vdso_base + vdso32_sigtramp;
1053 if (save_user_regs(regs, &frame->mctx, __NR_sigreturn))
1055 regs->link = (unsigned long) frame->mctx.tramp;
1058 current->thread.fpscr.val = 0; /* turn off all fp exceptions */
1060 if (put_user(regs->gpr[1], (u32 __user *)newsp))
1062 regs->gpr[1] = newsp;
1064 regs->gpr[4] = (unsigned long) sc;
1065 regs->nip = (unsigned long) ka->sa.sa_handler;
1072 printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
1073 regs, frame, newsp);
1075 force_sigsegv(sig, current);
1080 * Do a signal return; undo the signal stack.
1082 long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
1083 struct pt_regs *regs)
1085 struct sigcontext __user *sc;
1086 struct sigcontext sigctx;
1087 struct mcontext __user *sr;
1090 /* Always make any pending restarted system calls return -EINTR */
1091 current_thread_info()->restart_block.fn = do_no_restart_syscall;
1093 sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
1094 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
1099 * Note that PPC32 puts the upper 32 bits of the sigmask in the
1100 * unused part of the signal stackframe
1102 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1104 set.sig[0] = sigctx.oldmask;
1105 set.sig[1] = sigctx._unused[3];
1107 restore_sigmask(&set);
1109 sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
1110 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1111 || restore_user_regs(regs, sr, 1))
1114 set_thread_flag(TIF_RESTOREALL);
1118 force_sig(SIGSEGV, current);
1123 * Note that 'init' is a special process: it doesn't get signals it doesn't
1124 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1127 int do_signal(sigset_t *oldset, struct pt_regs *regs)
1130 struct k_sigaction ka;
1135 if (try_to_freeze()) {
1137 if (!signal_pending(current))
1142 if (test_thread_flag(TIF_RESTORE_SIGMASK))
1143 oldset = ¤t->saved_sigmask;
1145 oldset = ¤t->blocked;
1147 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
1151 if (TRAP(regs) == 0x0C00 /* System Call! */
1152 && regs->ccr & 0x10000000 /* error signalled */
1153 && ((ret = regs->gpr[3]) == ERESTARTSYS
1154 || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR
1155 || ret == ERESTART_RESTARTBLOCK)) {
1158 && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK
1159 || (ret == ERESTARTSYS
1160 && !(ka.sa.sa_flags & SA_RESTART)))) {
1161 /* make the system call return an EINTR error */
1162 regs->result = -EINTR;
1163 regs->gpr[3] = EINTR;
1164 /* note that the cr0.SO bit is already set */
1166 regs->nip -= 4; /* Back up & retry system call */
1169 if (ret == ERESTART_RESTARTBLOCK)
1170 regs->gpr[0] = __NR_restart_syscall;
1172 regs->gpr[3] = regs->orig_gpr3;
1177 /* No signal to deliver -- put the saved sigmask back */
1178 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
1179 clear_thread_flag(TIF_RESTORE_SIGMASK);
1180 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
1182 return 0; /* no signals delivered */
1185 if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size
1186 && !on_sig_stack(regs->gpr[1]))
1187 newsp = current->sas_ss_sp + current->sas_ss_size;
1189 newsp = regs->gpr[1];
1194 * Reenable the DABR before delivering the signal to
1195 * user space. The DABR will have been cleared if it
1196 * triggered inside the kernel.
1198 if (current->thread.dabr)
1199 set_dabr(current->thread.dabr);
1202 /* Whee! Actually deliver the signal. */
1203 if (ka.sa.sa_flags & SA_SIGINFO)
1204 ret = handle_rt_signal(signr, &ka, &info, oldset, regs, newsp);
1206 ret = handle_signal(signr, &ka, &info, oldset, regs, newsp);
1209 spin_lock_irq(¤t->sighand->siglock);
1210 sigorsets(¤t->blocked, ¤t->blocked,
1212 if (!(ka.sa.sa_flags & SA_NODEFER))
1213 sigaddset(¤t->blocked, signr);
1214 recalc_sigpending();
1215 spin_unlock_irq(¤t->sighand->siglock);
1216 /* A signal was successfully delivered; the saved sigmask is in
1217 its frame, and we can clear the TIF_RESTORE_SIGMASK flag */
1218 if (test_thread_flag(TIF_RESTORE_SIGMASK))
1219 clear_thread_flag(TIF_RESTORE_SIGMASK);