2 * signal32.c: Support 32bit signal syscalls.
4 * Copyright (C) 2001 IBM
5 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
8 * These routines maintain argument size conversion between 32bit and 64bit
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
17 #include <linux/config.h>
18 #include <linux/sched.h>
20 #include <linux/smp.h>
21 #include <linux/smp_lock.h>
22 #include <linux/kernel.h>
23 #include <linux/signal.h>
24 #include <linux/syscalls.h>
25 #include <linux/errno.h>
26 #include <linux/elf.h>
27 #include <linux/compat.h>
28 #include <linux/ptrace.h>
29 #include <asm/ppc32.h>
30 #include <asm/uaccess.h>
31 #include <asm/ppcdebug.h>
32 #include <asm/unistd.h>
33 #include <asm/cacheflush.h>
37 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
39 #define GP_REGS_SIZE32 min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
42 * When we have signals to deliver, we set up on the
43 * user stack, going down from the original stack pointer:
45 * a sigcontext32 struct
46 * a gap of __SIGNAL_FRAMESIZE32 bytes
48 * Each of these things must be a multiple of 16 bytes in size.
52 struct mcontext32 mctx; /* all the register values */
54 * Programs using the rs6000/xcoff abi can save up to 19 gp
55 * regs and 18 fp regs below sp before decrementing it.
60 /* We use the mc_pad field for the signal return trampoline. */
64 * When we have rt signals to deliver, we set up on the
65 * user stack, going down from the original stack pointer:
66 * one rt_sigframe32 struct (siginfo + ucontext + ABI gap)
67 * a gap of __SIGNAL_FRAMESIZE32+16 bytes
68 * (the +16 is to get the siginfo and ucontext32 in the same
69 * positions as in older kernels).
71 * Each of these things must be a multiple of 16 bytes in size.
74 struct rt_sigframe32 {
75 struct compat_siginfo info;
78 * Programs using the rs6000/xcoff abi can save up to 19 gp
79 * regs and 18 fp regs below sp before decrementing it.
86 * Common utility functions used by signal and context support
91 * Restore the user process's signal mask
92 * (implemented in signal.c)
94 extern void restore_sigmask(sigset_t *set);
97 * Functions for flipping sigsets (thanks to brain dead generic
98 * implementation that makes things simple for little endian only
100 static inline void compat_from_sigset(compat_sigset_t *compat, sigset_t *set)
102 switch (_NSIG_WORDS) {
103 case 4: compat->sig[5] = set->sig[3] & 0xffffffffull ;
104 compat->sig[7] = set->sig[3] >> 32;
105 case 3: compat->sig[4] = set->sig[2] & 0xffffffffull ;
106 compat->sig[5] = set->sig[2] >> 32;
107 case 2: compat->sig[2] = set->sig[1] & 0xffffffffull ;
108 compat->sig[3] = set->sig[1] >> 32;
109 case 1: compat->sig[0] = set->sig[0] & 0xffffffffull ;
110 compat->sig[1] = set->sig[0] >> 32;
114 static inline void sigset_from_compat(sigset_t *set, compat_sigset_t *compat)
116 switch (_NSIG_WORDS) {
117 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32);
118 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32);
119 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32);
120 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32);
126 * Save the current user registers on the user stack.
127 * We only save the altivec registers if the process has used
128 * altivec instructions at some point.
130 static int save_user_regs(struct pt_regs *regs, struct mcontext32 __user *frame, int sigret)
132 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
135 /* Make sure floating point registers are stored in regs */
136 flush_fp_to_thread(current);
138 /* save general and floating-point registers */
139 for (i = 0; i <= PT_RESULT; i ++)
140 err |= __put_user((unsigned int)gregs[i], &frame->mc_gregs[i]);
141 err |= __copy_to_user(&frame->mc_fregs, current->thread.fpr,
142 ELF_NFPREG * sizeof(double));
146 current->thread.fpscr = 0; /* turn off all fp exceptions */
148 #ifdef CONFIG_ALTIVEC
149 /* save altivec registers */
150 if (current->thread.used_vr) {
151 flush_altivec_to_thread(current);
152 if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
153 ELF_NVRREG32 * sizeof(vector128)))
155 /* set MSR_VEC in the saved MSR value to indicate that
156 frame->mc_vregs contains valid data */
157 if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR]))
160 /* else assert((regs->msr & MSR_VEC) == 0) */
162 /* We always copy to/from vrsave, it's 0 if we don't have or don't
163 * use altivec. Since VSCR only contains 32 bits saved in the least
164 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
165 * most significant bits of that same vector. --BenH
167 if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
169 #endif /* CONFIG_ALTIVEC */
172 /* Set up the sigreturn trampoline: li r0,sigret; sc */
173 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
174 || __put_user(0x44000002UL, &frame->tramp[1]))
176 flush_icache_range((unsigned long) &frame->tramp[0],
177 (unsigned long) &frame->tramp[2]);
184 * Restore the current user register values from the user stack,
187 static long restore_user_regs(struct pt_regs *regs,
188 struct mcontext32 __user *sr, int sig)
190 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
193 unsigned int save_r2 = 0;
194 #ifdef CONFIG_ALTIVEC
199 * restore general registers but not including MSR or SOFTE. Also
200 * take care of keeping r2 (TLS) intact if not a signal
203 save_r2 = (unsigned int)regs->gpr[2];
204 for (i = 0; i <= PT_RESULT; i++) {
205 if ((i == PT_MSR) || (i == PT_SOFTE))
207 err |= __get_user(gregs[i], &sr->mc_gregs[i]);
210 regs->gpr[2] = (unsigned long) save_r2;
214 /* force the process to reload the FP registers from
215 current->thread when it next does FP instructions */
216 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
217 if (__copy_from_user(current->thread.fpr, &sr->mc_fregs,
218 sizeof(sr->mc_fregs)))
221 #ifdef CONFIG_ALTIVEC
222 /* force the process to reload the altivec registers from
223 current->thread when it next does altivec instructions */
224 regs->msr &= ~MSR_VEC;
225 if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_VEC) != 0) {
226 /* restore altivec registers from the stack */
227 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
228 sizeof(sr->mc_vregs)))
230 } else if (current->thread.used_vr)
231 memset(current->thread.vr, 0, ELF_NVRREG32 * sizeof(vector128));
233 /* Always get VRSAVE back */
234 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
236 #endif /* CONFIG_ALTIVEC */
240 if (last_task_used_math == current)
241 last_task_used_math = NULL;
242 if (last_task_used_altivec == current)
243 last_task_used_altivec = NULL;
251 * Start of nonRT signal support
253 * sigset_t is 32 bits for non-rt signals
256 * sigaction sys32_sigaction
257 * sigreturn sys32_sigreturn
259 * Note sigsuspend has no special 32 bit routine - uses the 64 bit routine
266 * Atomically swap in the new signal mask, and wait for a signal.
268 long sys32_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7,
269 struct pt_regs *regs)
274 spin_lock_irq(¤t->sighand->siglock);
275 saveset = current->blocked;
276 siginitset(¤t->blocked, mask);
278 spin_unlock_irq(¤t->sighand->siglock);
280 regs->result = -EINTR;
281 regs->gpr[3] = EINTR;
282 regs->ccr |= 0x10000000;
284 current->state = TASK_INTERRUPTIBLE;
286 if (do_signal32(&saveset, regs))
288 * Returning 0 means we return to userspace via
289 * ret_from_except and thus restore all user
290 * registers from *regs. This is what we need
291 * to do when a signal has been delivered.
297 long sys32_sigaction(int sig, struct old_sigaction32 __user *act,
298 struct old_sigaction32 __user *oact)
300 struct k_sigaction new_ka, old_ka;
307 compat_old_sigset_t mask;
308 compat_uptr_t handler, restorer;
310 if (get_user(handler, &act->sa_handler) ||
311 __get_user(restorer, &act->sa_restorer) ||
312 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
313 __get_user(mask, &act->sa_mask))
315 new_ka.sa.sa_handler = compat_ptr(handler);
316 new_ka.sa.sa_restorer = compat_ptr(restorer);
317 siginitset(&new_ka.sa.sa_mask, mask);
320 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
322 if (put_user((long)old_ka.sa.sa_handler, &oact->sa_handler) ||
323 __put_user((long)old_ka.sa.sa_restorer, &oact->sa_restorer) ||
324 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
325 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
335 * Start of RT signal support
337 * sigset_t is 64 bits for rt signals
340 * sigaction sys32_rt_sigaction
341 * sigpending sys32_rt_sigpending
342 * sigprocmask sys32_rt_sigprocmask
343 * sigreturn sys32_rt_sigreturn
344 * sigtimedwait sys32_rt_sigtimedwait
345 * sigqueueinfo sys32_rt_sigqueueinfo
346 * sigsuspend sys32_rt_sigsuspend
350 * copy_siginfo_to_user32
355 long sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
356 struct sigaction32 __user *oact, size_t sigsetsize)
358 struct k_sigaction new_ka, old_ka;
360 compat_sigset_t set32;
362 /* XXX: Don't preclude handling different sized sigset_t's. */
363 if (sigsetsize != sizeof(compat_sigset_t))
367 compat_uptr_t handler;
369 ret = get_user(handler, &act->sa_handler);
370 new_ka.sa.sa_handler = compat_ptr(handler);
371 ret |= __copy_from_user(&set32, &act->sa_mask,
372 sizeof(compat_sigset_t));
373 sigset_from_compat(&new_ka.sa.sa_mask, &set32);
374 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
379 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
381 compat_from_sigset(&set32, &old_ka.sa.sa_mask);
382 ret = put_user((long)old_ka.sa.sa_handler, &oact->sa_handler);
383 ret |= __copy_to_user(&oact->sa_mask, &set32,
384 sizeof(compat_sigset_t));
385 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
391 * Note: it is necessary to treat how as an unsigned int, with the
392 * corresponding cast to a signed int to insure that the proper
393 * conversion (sign extension) between the register representation
394 * of a signed int (msr in 32-bit mode) and the register representation
395 * of a signed int (msr in 64-bit mode) is performed.
397 long sys32_rt_sigprocmask(u32 how, compat_sigset_t __user *set,
398 compat_sigset_t __user *oset, size_t sigsetsize)
404 mm_segment_t old_fs = get_fs();
407 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
409 sigset_from_compat(&s, &s32);
413 /* This is valid because of the set_fs() */
414 up = (sigset_t __user *) &s;
415 ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL,
421 compat_from_sigset(&s32, &s);
422 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
428 long sys32_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
433 mm_segment_t old_fs = get_fs();
436 /* The __user pointer cast is valid because of the set_fs() */
437 ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
440 compat_from_sigset(&s32, &s);
441 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
448 static long copy_siginfo_to_user32(compat_siginfo_t __user *d, siginfo_t *s)
452 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
455 /* If you change siginfo_t structure, please be sure
456 * this code is fixed accordingly.
457 * It should never copy any pad contained in the structure
458 * to avoid security leaks, but must copy the generic
459 * 3 ints plus the relevant union member.
460 * This routine must convert siginfo from 64bit to 32bit as well
463 err = __put_user(s->si_signo, &d->si_signo);
464 err |= __put_user(s->si_errno, &d->si_errno);
465 err |= __put_user((short)s->si_code, &d->si_code);
467 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
469 else switch(s->si_code >> 16) {
470 case __SI_CHLD >> 16:
471 err |= __put_user(s->si_pid, &d->si_pid);
472 err |= __put_user(s->si_uid, &d->si_uid);
473 err |= __put_user(s->si_utime, &d->si_utime);
474 err |= __put_user(s->si_stime, &d->si_stime);
475 err |= __put_user(s->si_status, &d->si_status);
477 case __SI_FAULT >> 16:
478 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
481 case __SI_POLL >> 16:
482 err |= __put_user(s->si_band, &d->si_band);
483 err |= __put_user(s->si_fd, &d->si_fd);
485 case __SI_TIMER >> 16:
486 err |= __put_user(s->si_tid, &d->si_tid);
487 err |= __put_user(s->si_overrun, &d->si_overrun);
488 err |= __put_user(s->si_int, &d->si_int);
490 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
491 case __SI_MESGQ >> 16:
492 err |= __put_user(s->si_int, &d->si_int);
494 case __SI_KILL >> 16:
496 err |= __put_user(s->si_pid, &d->si_pid);
497 err |= __put_user(s->si_uid, &d->si_uid);
503 long sys32_rt_sigtimedwait(compat_sigset_t __user *uthese, compat_siginfo_t __user *uinfo,
504 struct compat_timespec __user *uts, compat_size_t sigsetsize)
510 mm_segment_t old_fs = get_fs();
513 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
515 sigset_from_compat(&s, &s32);
516 if (uts && get_compat_timespec(&t, uts))
519 /* The __user pointer casts are valid because of the set_fs() */
520 ret = sys_rt_sigtimedwait((sigset_t __user *) &s,
521 uinfo ? (siginfo_t __user *) &info : NULL,
522 uts ? (struct timespec __user *) &t : NULL,
525 if (ret >= 0 && uinfo) {
526 if (copy_siginfo_to_user32(uinfo, &info))
533 * Note: it is necessary to treat pid and sig as unsigned ints, with the
534 * corresponding cast to a signed int to insure that the proper conversion
535 * (sign extension) between the register representation of a signed int
536 * (msr in 32-bit mode) and the register representation of a signed int
537 * (msr in 64-bit mode) is performed.
539 long sys32_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo)
543 mm_segment_t old_fs = get_fs();
545 if (copy_from_user (&info, uinfo, 3*sizeof(int)) ||
546 copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32))
549 /* The __user pointer cast is valid becasuse of the set_fs() */
550 ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info);
555 int sys32_rt_sigsuspend(compat_sigset_t __user * unewset, size_t sigsetsize, int p3,
556 int p4, int p6, int p7, struct pt_regs *regs)
558 sigset_t saveset, newset;
561 /* XXX: Don't preclude handling different sized sigset_t's. */
562 if (sigsetsize != sizeof(sigset_t))
565 if (copy_from_user(&s32, unewset, sizeof(s32)))
569 * Swap the 2 words of the 64-bit sigset_t (they are stored
570 * in the "wrong" endian in 32-bit user storage).
572 sigset_from_compat(&newset, &s32);
574 sigdelsetmask(&newset, ~_BLOCKABLE);
575 spin_lock_irq(¤t->sighand->siglock);
576 saveset = current->blocked;
577 current->blocked = newset;
579 spin_unlock_irq(¤t->sighand->siglock);
581 regs->result = -EINTR;
582 regs->gpr[3] = EINTR;
583 regs->ccr |= 0x10000000;
585 current->state = TASK_INTERRUPTIBLE;
587 if (do_signal32(&saveset, regs))
589 * Returning 0 means we return to userspace via
590 * ret_from_except and thus restore all user
591 * registers from *regs. This is what we need
592 * to do when a signal has been delivered.
599 * Start Alternate signal stack support
602 * sigaltatck sys32_sigaltstack
605 int sys32_sigaltstack(u32 __new, u32 __old, int r5,
606 int r6, int r7, int r8, struct pt_regs *regs)
608 stack_32_t __user * newstack = (stack_32_t __user *)(long) __new;
609 stack_32_t __user * oldstack = (stack_32_t __user *)(long) __old;
617 * set sp to the user stack on entry to the system call
618 * the system call router sets R9 to the saved registers
622 /* Put new stack info in local 64 bit stack struct */
624 if (get_user(ss_sp, &newstack->ss_sp) ||
625 __get_user(uss.ss_flags, &newstack->ss_flags) ||
626 __get_user(uss.ss_size, &newstack->ss_size))
628 uss.ss_sp = compat_ptr(ss_sp);
633 /* The __user pointer casts are valid because of the set_fs() */
634 ret = do_sigaltstack(
635 newstack ? (stack_t __user *) &uss : NULL,
636 oldstack ? (stack_t __user *) &uoss : NULL,
639 /* Copy the stack information to the user output buffer */
640 if (!ret && oldstack &&
641 (put_user((long)uoss.ss_sp, &oldstack->ss_sp) ||
642 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
643 __put_user(uoss.ss_size, &oldstack->ss_size)))
650 * Set up a signal frame for a "real-time" signal handler
651 * (one which gets siginfo).
653 static int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
654 siginfo_t *info, sigset_t *oldset,
655 struct pt_regs * regs, unsigned long newsp)
657 struct rt_sigframe32 __user *rt_sf;
658 struct mcontext32 __user *frame;
659 unsigned long origsp = newsp;
660 compat_sigset_t c_oldset;
662 /* Set up Signal Frame */
663 /* Put a Real Time Context onto stack */
664 newsp -= sizeof(*rt_sf);
665 rt_sf = (struct rt_sigframe32 __user *)newsp;
667 /* create a stack frame for the caller of the handler */
668 newsp -= __SIGNAL_FRAMESIZE32 + 16;
670 if (verify_area(VERIFY_WRITE, (void __user *)newsp, origsp - newsp))
673 compat_from_sigset(&c_oldset, oldset);
675 /* Put the siginfo & fill in most of the ucontext */
676 if (copy_siginfo_to_user32(&rt_sf->info, info)
677 || __put_user(0, &rt_sf->uc.uc_flags)
678 || __put_user(0, &rt_sf->uc.uc_link)
679 || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
680 || __put_user(sas_ss_flags(regs->gpr[1]),
681 &rt_sf->uc.uc_stack.ss_flags)
682 || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)
683 || __put_user((u32)(u64)&rt_sf->uc.uc_mcontext, &rt_sf->uc.uc_regs)
684 || __copy_to_user(&rt_sf->uc.uc_sigmask, &c_oldset, sizeof(c_oldset)))
687 /* Save user registers on the stack */
688 frame = &rt_sf->uc.uc_mcontext;
689 if (save_user_regs(regs, frame, __NR_rt_sigreturn))
692 if (put_user(regs->gpr[1], (unsigned long __user *)newsp))
694 regs->gpr[1] = (unsigned long) newsp;
696 regs->gpr[4] = (unsigned long) &rt_sf->info;
697 regs->gpr[5] = (unsigned long) &rt_sf->uc;
698 regs->gpr[6] = (unsigned long) rt_sf;
699 regs->nip = (unsigned long) ka->sa.sa_handler;
700 regs->link = (unsigned long) frame->tramp;
704 if (test_thread_flag(TIF_SINGLESTEP))
705 ptrace_notify(SIGTRAP);
711 printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
714 force_sigsegv(sig, current);
718 static long do_setcontext32(struct ucontext32 __user *ucp, struct pt_regs *regs, int sig)
720 compat_sigset_t c_set;
724 if (__copy_from_user(&c_set, &ucp->uc_sigmask, sizeof(c_set))
725 || __get_user(mcp, &ucp->uc_regs))
727 sigset_from_compat(&set, &c_set);
728 restore_sigmask(&set);
729 if (restore_user_regs(regs, (struct mcontext32 __user *)(u64)mcp, sig))
736 * Handle {get,set,swap}_context operations for 32 bits processes
739 long sys32_swapcontext(struct ucontext32 __user *old_ctx,
740 struct ucontext32 __user *new_ctx,
741 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
744 compat_sigset_t c_set;
746 /* Context size is for future use. Right now, we only make sure
747 * we are passed something we understand
749 if (ctx_size < sizeof(struct ucontext32))
752 if (old_ctx != NULL) {
753 compat_from_sigset(&c_set, ¤t->blocked);
754 if (verify_area(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
755 || save_user_regs(regs, &old_ctx->uc_mcontext, 0)
756 || __copy_to_user(&old_ctx->uc_sigmask, &c_set, sizeof(c_set))
757 || __put_user((u32)(u64)&old_ctx->uc_mcontext, &old_ctx->uc_regs))
762 if (verify_area(VERIFY_READ, new_ctx, sizeof(*new_ctx))
763 || __get_user(tmp, (u8 __user *) new_ctx)
764 || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1))
768 * If we get a fault copying the context into the kernel's
769 * image of the user's registers, we can't just return -EFAULT
770 * because the user's registers will be corrupted. For instance
771 * the NIP value may have been updated but not some of the
772 * other registers. Given that we have done the verify_area
773 * and successfully read the first and last bytes of the region
774 * above, this should only happen in an out-of-memory situation
775 * or if another thread unmaps the region containing the context.
776 * We kill the task with a SIGSEGV in this situation.
778 if (do_setcontext32(new_ctx, regs, 0))
784 long sys32_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
785 struct pt_regs *regs)
787 struct rt_sigframe32 __user *rt_sf;
791 /* Always make any pending restarted system calls return -EINTR */
792 current_thread_info()->restart_block.fn = do_no_restart_syscall;
794 rt_sf = (struct rt_sigframe32 __user *)
795 (regs->gpr[1] + __SIGNAL_FRAMESIZE32 + 16);
796 if (verify_area(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
798 if (do_setcontext32(&rt_sf->uc, regs, 1))
802 * It's not clear whether or why it is desirable to save the
803 * sigaltstack setting on signal delivery and restore it on
804 * signal return. But other architectures do this and we have
805 * always done it up until now so it is probably better not to
806 * change it. -- paulus
807 * We use the sys32_ version that does the 32/64 bits conversion
808 * and takes userland pointer directly. What about error checking ?
811 sys32_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs);
818 force_sig(SIGSEGV, current);
824 * OK, we're invoking a handler
826 static int handle_signal32(unsigned long sig, struct k_sigaction *ka,
827 siginfo_t *info, sigset_t *oldset,
828 struct pt_regs * regs, unsigned long newsp)
830 struct sigcontext32 __user *sc;
831 struct sigregs32 __user *frame;
832 unsigned long origsp = newsp;
834 /* Set up Signal Frame */
835 newsp -= sizeof(struct sigregs32);
836 frame = (struct sigregs32 __user *) newsp;
838 /* Put a sigcontext on the stack */
839 newsp -= sizeof(*sc);
840 sc = (struct sigcontext32 __user *) newsp;
842 /* create a stack frame for the caller of the handler */
843 newsp -= __SIGNAL_FRAMESIZE32;
845 if (verify_area(VERIFY_WRITE, (void __user *) newsp, origsp - newsp))
849 #error "Please adjust handle_signal32()"
851 if (__put_user((u32)(u64)ka->sa.sa_handler, &sc->handler)
852 || __put_user(oldset->sig[0], &sc->oldmask)
853 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
854 || __put_user((u32)(u64)frame, &sc->regs)
855 || __put_user(sig, &sc->signal))
858 if (save_user_regs(regs, &frame->mctx, __NR_sigreturn))
861 if (put_user(regs->gpr[1], (unsigned long __user *)newsp))
863 regs->gpr[1] = (unsigned long) newsp;
865 regs->gpr[4] = (unsigned long) sc;
866 regs->nip = (unsigned long) ka->sa.sa_handler;
867 regs->link = (unsigned long) frame->mctx.tramp;
871 if (test_thread_flag(TIF_SINGLESTEP))
872 ptrace_notify(SIGTRAP);
878 printk("badframe in handle_signal, regs=%p frame=%x newsp=%x\n",
879 regs, frame, *newspp);
881 force_sigsegv(sig, current);
886 * Do a signal return; undo the signal stack.
888 long sys32_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
889 struct pt_regs *regs)
891 struct sigcontext32 __user *sc;
892 struct sigcontext32 sigctx;
893 struct mcontext32 __user *sr;
897 /* Always make any pending restarted system calls return -EINTR */
898 current_thread_info()->restart_block.fn = do_no_restart_syscall;
900 sc = (struct sigcontext32 __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE32);
901 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
905 * Note that PPC32 puts the upper 32 bits of the sigmask in the
906 * unused part of the signal stackframe
908 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
909 restore_sigmask(&set);
911 sr = (struct mcontext32 __user *)(u64)sigctx.regs;
912 if (verify_area(VERIFY_READ, sr, sizeof(*sr))
913 || restore_user_regs(regs, sr, 1))
920 force_sig(SIGSEGV, current);
927 * Start of do_signal32 routine
929 * This routine gets control when a pending signal needs to be processed
930 * in the 32 bit target thread -
932 * It handles both rt and non-rt signals
936 * Note that 'init' is a special process: it doesn't get signals it doesn't
937 * want to handle. Thus you cannot kill init even with a SIGKILL even by
941 int do_signal32(sigset_t *oldset, struct pt_regs *regs)
944 unsigned int frame, newsp;
946 struct k_sigaction ka;
949 oldset = ¤t->blocked;
953 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
955 if (TRAP(regs) == 0x0C00 /* System Call! */
956 && regs->ccr & 0x10000000 /* error signalled */
957 && ((ret = regs->gpr[3]) == ERESTARTSYS
958 || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR
959 || ret == ERESTART_RESTARTBLOCK)) {
962 && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK
963 || (ret == ERESTARTSYS
964 && !(ka.sa.sa_flags & SA_RESTART)))) {
965 /* make the system call return an EINTR error */
966 regs->result = -EINTR;
967 regs->gpr[3] = EINTR;
968 /* note that the cr0.SO bit is already set */
970 regs->nip -= 4; /* Back up & retry system call */
973 if (ret == ERESTART_RESTARTBLOCK)
974 regs->gpr[0] = __NR_restart_syscall;
976 regs->gpr[3] = regs->orig_gpr3;
981 return 0; /* no signals delivered */
983 if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size
984 && (!on_sig_stack(regs->gpr[1])))
985 newsp = (current->sas_ss_sp + current->sas_ss_size);
987 newsp = regs->gpr[1];
990 /* Whee! Actually deliver the signal. */
991 if (ka.sa.sa_flags & SA_SIGINFO)
992 ret = handle_rt_signal32(signr, &ka, &info, oldset, regs, newsp);
994 ret = handle_signal32(signr, &ka, &info, oldset, regs, newsp);
996 if (ret && !(ka.sa.sa_flags & SA_NODEFER)) {
997 spin_lock_irq(¤t->sighand->siglock);
998 sigorsets(¤t->blocked, ¤t->blocked,
1000 sigaddset(¤t->blocked, signr);
1001 recalc_sigpending();
1002 spin_unlock_irq(¤t->sighand->siglock);