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 <asm/ppc32.h>
29 #include <asm/uaccess.h>
30 #include <asm/ppcdebug.h>
31 #include <asm/unistd.h>
32 #include <asm/cacheflush.h>
36 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
38 #define GP_REGS_SIZE32 min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
41 * When we have signals to deliver, we set up on the
42 * user stack, going down from the original stack pointer:
44 * a sigcontext32 struct
45 * a gap of __SIGNAL_FRAMESIZE32 bytes
47 * Each of these things must be a multiple of 16 bytes in size.
51 struct mcontext32 mctx; /* all the register values */
53 * Programs using the rs6000/xcoff abi can save up to 19 gp
54 * regs and 18 fp regs below sp before decrementing it.
59 /* We use the mc_pad field for the signal return trampoline. */
63 * When we have rt signals to deliver, we set up on the
64 * user stack, going down from the original stack pointer:
65 * one rt_sigframe32 struct (siginfo + ucontext + ABI gap)
66 * a gap of __SIGNAL_FRAMESIZE32+16 bytes
67 * (the +16 is to get the siginfo and ucontext32 in the same
68 * positions as in older kernels).
70 * Each of these things must be a multiple of 16 bytes in size.
73 struct rt_sigframe32 {
74 struct compat_siginfo info;
77 * Programs using the rs6000/xcoff abi can save up to 19 gp
78 * regs and 18 fp regs below sp before decrementing it.
85 * Common utility functions used by signal and context support
90 * Restore the user process's signal mask
91 * (implemented in signal.c)
93 extern void restore_sigmask(sigset_t *set);
96 * Functions for flipping sigsets (thanks to brain dead generic
97 * implementation that makes things simple for little endian only
99 static inline void compat_from_sigset(compat_sigset_t *compat, sigset_t *set)
101 switch (_NSIG_WORDS) {
102 case 4: compat->sig[5] = set->sig[3] & 0xffffffffull ;
103 compat->sig[7] = set->sig[3] >> 32;
104 case 3: compat->sig[4] = set->sig[2] & 0xffffffffull ;
105 compat->sig[5] = set->sig[2] >> 32;
106 case 2: compat->sig[2] = set->sig[1] & 0xffffffffull ;
107 compat->sig[3] = set->sig[1] >> 32;
108 case 1: compat->sig[0] = set->sig[0] & 0xffffffffull ;
109 compat->sig[1] = set->sig[0] >> 32;
113 static inline void sigset_from_compat(sigset_t *set, compat_sigset_t *compat)
115 switch (_NSIG_WORDS) {
116 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32);
117 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32);
118 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32);
119 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32);
125 * Save the current user registers on the user stack.
126 * We only save the altivec registers if the process has used
127 * altivec instructions at some point.
129 static int save_user_regs(struct pt_regs *regs, struct mcontext32 __user *frame, int sigret)
131 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
134 /* Make sure floating point registers are stored in regs */
135 flush_fp_to_thread(current);
137 /* save general and floating-point registers */
138 for (i = 0; i <= PT_RESULT; i ++)
139 err |= __put_user((unsigned int)gregs[i], &frame->mc_gregs[i]);
140 err |= __copy_to_user(&frame->mc_fregs, current->thread.fpr,
141 ELF_NFPREG * sizeof(double));
145 current->thread.fpscr = 0; /* turn off all fp exceptions */
147 #ifdef CONFIG_ALTIVEC
148 /* save altivec registers */
149 if (current->thread.used_vr) {
150 flush_altivec_to_thread(current);
151 if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
152 ELF_NVRREG32 * sizeof(vector128)))
154 /* set MSR_VEC in the saved MSR value to indicate that
155 frame->mc_vregs contains valid data */
156 if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR]))
159 /* else assert((regs->msr & MSR_VEC) == 0) */
161 /* We always copy to/from vrsave, it's 0 if we don't have or don't
162 * use altivec. Since VSCR only contains 32 bits saved in the least
163 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
164 * most significant bits of that same vector. --BenH
166 if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
168 #endif /* CONFIG_ALTIVEC */
171 /* Set up the sigreturn trampoline: li r0,sigret; sc */
172 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
173 || __put_user(0x44000002UL, &frame->tramp[1]))
175 flush_icache_range((unsigned long) &frame->tramp[0],
176 (unsigned long) &frame->tramp[2]);
183 * Restore the current user register values from the user stack,
186 static long restore_user_regs(struct pt_regs *regs,
187 struct mcontext32 __user *sr, int sig)
189 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
192 unsigned int save_r2 = 0;
193 #ifdef CONFIG_ALTIVEC
198 * restore general registers but not including MSR or SOFTE. Also
199 * take care of keeping r2 (TLS) intact if not a signal
202 save_r2 = (unsigned int)regs->gpr[2];
203 for (i = 0; i <= PT_RESULT; i++) {
204 if ((i == PT_MSR) || (i == PT_SOFTE))
206 err |= __get_user(gregs[i], &sr->mc_gregs[i]);
209 regs->gpr[2] = (unsigned long) save_r2;
213 /* force the process to reload the FP registers from
214 current->thread when it next does FP instructions */
215 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
216 if (__copy_from_user(current->thread.fpr, &sr->mc_fregs,
217 sizeof(sr->mc_fregs)))
220 #ifdef CONFIG_ALTIVEC
221 /* force the process to reload the altivec registers from
222 current->thread when it next does altivec instructions */
223 regs->msr &= ~MSR_VEC;
224 if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_VEC) != 0) {
225 /* restore altivec registers from the stack */
226 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
227 sizeof(sr->mc_vregs)))
229 } else if (current->thread.used_vr)
230 memset(¤t->thread.vr, 0, ELF_NVRREG32 * sizeof(vector128));
232 /* Always get VRSAVE back */
233 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
235 #endif /* CONFIG_ALTIVEC */
242 * Start of nonRT signal support
244 * sigset_t is 32 bits for non-rt signals
247 * sigaction sys32_sigaction
248 * sigreturn sys32_sigreturn
250 * Note sigsuspend has no special 32 bit routine - uses the 64 bit routine
257 * Atomically swap in the new signal mask, and wait for a signal.
259 long sys32_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7,
260 struct pt_regs *regs)
265 spin_lock_irq(¤t->sighand->siglock);
266 saveset = current->blocked;
267 siginitset(¤t->blocked, mask);
269 spin_unlock_irq(¤t->sighand->siglock);
271 regs->result = -EINTR;
272 regs->gpr[3] = EINTR;
273 regs->ccr |= 0x10000000;
275 current->state = TASK_INTERRUPTIBLE;
277 if (do_signal32(&saveset, regs))
279 * If a signal handler needs to be called,
280 * do_signal32() has set R3 to the signal number (the
281 * first argument of the signal handler), so don't
282 * overwrite that with EINTR !
283 * In the other cases, do_signal32() doesn't touch
284 * R3, so it's still set to -EINTR (see above).
290 long sys32_sigaction(int sig, struct old_sigaction32 __user *act,
291 struct old_sigaction32 __user *oact)
293 struct k_sigaction new_ka, old_ka;
300 compat_old_sigset_t mask;
301 compat_uptr_t handler, restorer;
303 if (get_user(handler, &act->sa_handler) ||
304 __get_user(restorer, &act->sa_restorer) ||
305 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
306 __get_user(mask, &act->sa_mask))
308 new_ka.sa.sa_handler = compat_ptr(handler);
309 new_ka.sa.sa_restorer = compat_ptr(restorer);
310 siginitset(&new_ka.sa.sa_mask, mask);
313 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
315 if (put_user((long)old_ka.sa.sa_handler, &oact->sa_handler) ||
316 __put_user((long)old_ka.sa.sa_restorer, &oact->sa_restorer) ||
317 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
318 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
328 * Start of RT signal support
330 * sigset_t is 64 bits for rt signals
333 * sigaction sys32_rt_sigaction
334 * sigpending sys32_rt_sigpending
335 * sigprocmask sys32_rt_sigprocmask
336 * sigreturn sys32_rt_sigreturn
337 * sigtimedwait sys32_rt_sigtimedwait
338 * sigqueueinfo sys32_rt_sigqueueinfo
339 * sigsuspend sys32_rt_sigsuspend
343 * copy_siginfo_to_user32
348 long sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
349 struct sigaction32 __user *oact, size_t sigsetsize)
351 struct k_sigaction new_ka, old_ka;
353 compat_sigset_t set32;
355 /* XXX: Don't preclude handling different sized sigset_t's. */
356 if (sigsetsize != sizeof(compat_sigset_t))
360 compat_uptr_t handler;
362 ret = get_user(handler, &act->sa_handler);
363 new_ka.sa.sa_handler = compat_ptr(handler);
364 ret |= __copy_from_user(&set32, &act->sa_mask,
365 sizeof(compat_sigset_t));
366 sigset_from_compat(&new_ka.sa.sa_mask, &set32);
367 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
372 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
374 compat_from_sigset(&set32, &old_ka.sa.sa_mask);
375 ret = put_user((long)old_ka.sa.sa_handler, &oact->sa_handler);
376 ret |= __copy_to_user(&oact->sa_mask, &set32,
377 sizeof(compat_sigset_t));
378 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
384 * Note: it is necessary to treat how as an unsigned int, with the
385 * corresponding cast to a signed int to insure that the proper
386 * conversion (sign extension) between the register representation
387 * of a signed int (msr in 32-bit mode) and the register representation
388 * of a signed int (msr in 64-bit mode) is performed.
390 long sys32_rt_sigprocmask(u32 how, compat_sigset_t __user *set,
391 compat_sigset_t __user *oset, size_t sigsetsize)
397 mm_segment_t old_fs = get_fs();
400 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
402 sigset_from_compat(&s, &s32);
406 /* This is valid because of the set_fs() */
407 up = (sigset_t __user *) &s;
408 ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL,
414 compat_from_sigset(&s32, &s);
415 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
421 long sys32_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
426 mm_segment_t old_fs = get_fs();
429 /* The __user pointer cast is valid because of the set_fs() */
430 ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
433 compat_from_sigset(&s32, &s);
434 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
441 static long copy_siginfo_to_user32(compat_siginfo_t __user *d, siginfo_t *s)
445 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
448 /* If you change siginfo_t structure, please be sure
449 * this code is fixed accordingly.
450 * It should never copy any pad contained in the structure
451 * to avoid security leaks, but must copy the generic
452 * 3 ints plus the relevant union member.
453 * This routine must convert siginfo from 64bit to 32bit as well
456 err = __put_user(s->si_signo, &d->si_signo);
457 err |= __put_user(s->si_errno, &d->si_errno);
458 err |= __put_user((short)s->si_code, &d->si_code);
460 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
462 else switch(s->si_code >> 16) {
463 case __SI_CHLD >> 16:
464 err |= __put_user(s->si_pid, &d->si_pid);
465 err |= __put_user(s->si_uid, &d->si_uid);
466 err |= __put_user(s->si_utime, &d->si_utime);
467 err |= __put_user(s->si_stime, &d->si_stime);
468 err |= __put_user(s->si_status, &d->si_status);
470 case __SI_FAULT >> 16:
471 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
474 case __SI_POLL >> 16:
475 err |= __put_user(s->si_band, &d->si_band);
476 err |= __put_user(s->si_fd, &d->si_fd);
478 case __SI_TIMER >> 16:
479 err |= __put_user(s->si_tid, &d->si_tid);
480 err |= __put_user(s->si_overrun, &d->si_overrun);
481 err |= __put_user(s->si_int, &d->si_int);
483 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
484 case __SI_MESGQ >> 16:
485 err |= __put_user(s->si_int, &d->si_int);
487 case __SI_KILL >> 16:
489 err |= __put_user(s->si_pid, &d->si_pid);
490 err |= __put_user(s->si_uid, &d->si_uid);
496 long sys32_rt_sigtimedwait(compat_sigset_t __user *uthese, compat_siginfo_t __user *uinfo,
497 struct compat_timespec __user *uts, compat_size_t sigsetsize)
503 mm_segment_t old_fs = get_fs();
506 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
508 sigset_from_compat(&s, &s32);
509 if (uts && get_compat_timespec(&t, uts))
512 /* The __user pointer casts are valid because of the set_fs() */
513 ret = sys_rt_sigtimedwait((sigset_t __user *) &s,
514 uinfo ? (siginfo_t __user *) &info : NULL,
515 uts ? (struct timespec __user *) &t : NULL,
518 if (ret >= 0 && uinfo) {
519 if (copy_siginfo_to_user32(uinfo, &info))
526 * Note: it is necessary to treat pid and sig as unsigned ints, with the
527 * corresponding cast to a signed int to insure that the proper conversion
528 * (sign extension) between the register representation of a signed int
529 * (msr in 32-bit mode) and the register representation of a signed int
530 * (msr in 64-bit mode) is performed.
532 long sys32_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo)
536 mm_segment_t old_fs = get_fs();
538 if (copy_from_user (&info, uinfo, 3*sizeof(int)) ||
539 copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32))
542 /* The __user pointer cast is valid becasuse of the set_fs() */
543 ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info);
548 int sys32_rt_sigsuspend(compat_sigset_t __user * unewset, size_t sigsetsize, int p3,
549 int p4, int p6, int p7, struct pt_regs *regs)
551 sigset_t saveset, newset;
554 /* XXX: Don't preclude handling different sized sigset_t's. */
555 if (sigsetsize != sizeof(sigset_t))
558 if (copy_from_user(&s32, unewset, sizeof(s32)))
562 * Swap the 2 words of the 64-bit sigset_t (they are stored
563 * in the "wrong" endian in 32-bit user storage).
565 sigset_from_compat(&newset, &s32);
567 sigdelsetmask(&newset, ~_BLOCKABLE);
568 spin_lock_irq(¤t->sighand->siglock);
569 saveset = current->blocked;
570 current->blocked = newset;
572 spin_unlock_irq(¤t->sighand->siglock);
574 regs->result = -EINTR;
575 regs->gpr[3] = EINTR;
576 regs->ccr |= 0x10000000;
578 current->state = TASK_INTERRUPTIBLE;
580 if (do_signal32(&saveset, regs))
582 * If a signal handler needs to be called,
583 * do_signal32() has set R3 to the signal number (the
584 * first argument of the signal handler), so don't
585 * overwrite that with EINTR !
586 * In the other cases, do_signal32() doesn't touch
587 * R3, so it's still set to -EINTR (see above).
594 * Start Alternate signal stack support
597 * sigaltatck sys32_sigaltstack
600 int sys32_sigaltstack(u32 __new, u32 __old, int r5,
601 int r6, int r7, int r8, struct pt_regs *regs)
603 stack_32_t __user * newstack = (stack_32_t __user *)(long) __new;
604 stack_32_t __user * oldstack = (stack_32_t __user *)(long) __old;
612 * set sp to the user stack on entry to the system call
613 * the system call router sets R9 to the saved registers
617 /* Put new stack info in local 64 bit stack struct */
619 if (get_user(ss_sp, &newstack->ss_sp) ||
620 __get_user(uss.ss_flags, &newstack->ss_flags) ||
621 __get_user(uss.ss_size, &newstack->ss_size))
623 uss.ss_sp = compat_ptr(ss_sp);
628 /* The __user pointer casts are valid because of the set_fs() */
629 ret = do_sigaltstack(
630 newstack ? (stack_t __user *) &uss : NULL,
631 oldstack ? (stack_t __user *) &uoss : NULL,
634 /* Copy the stack information to the user output buffer */
635 if (!ret && oldstack &&
636 (put_user((long)uoss.ss_sp, &oldstack->ss_sp) ||
637 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
638 __put_user(uoss.ss_size, &oldstack->ss_size)))
645 * Set up a signal frame for a "real-time" signal handler
646 * (one which gets siginfo).
648 static void handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
649 siginfo_t *info, sigset_t *oldset,
650 struct pt_regs * regs, unsigned long newsp)
652 struct rt_sigframe32 __user *rt_sf;
653 struct mcontext32 __user *frame;
654 unsigned long origsp = newsp;
655 compat_sigset_t c_oldset;
657 /* Set up Signal Frame */
658 /* Put a Real Time Context onto stack */
659 newsp -= sizeof(*rt_sf);
660 rt_sf = (struct rt_sigframe32 __user *)newsp;
662 /* create a stack frame for the caller of the handler */
663 newsp -= __SIGNAL_FRAMESIZE32 + 16;
665 if (verify_area(VERIFY_WRITE, (void __user *)newsp, origsp - newsp))
668 compat_from_sigset(&c_oldset, oldset);
670 /* Put the siginfo & fill in most of the ucontext */
671 if (copy_siginfo_to_user32(&rt_sf->info, info)
672 || __put_user(0, &rt_sf->uc.uc_flags)
673 || __put_user(0, &rt_sf->uc.uc_link)
674 || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
675 || __put_user(sas_ss_flags(regs->gpr[1]),
676 &rt_sf->uc.uc_stack.ss_flags)
677 || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)
678 || __put_user((u32)(u64)&rt_sf->uc.uc_mcontext, &rt_sf->uc.uc_regs)
679 || __copy_to_user(&rt_sf->uc.uc_sigmask, &c_oldset, sizeof(c_oldset)))
682 /* Save user registers on the stack */
683 frame = &rt_sf->uc.uc_mcontext;
684 if (save_user_regs(regs, frame, __NR_rt_sigreturn))
687 if (put_user(regs->gpr[1], (unsigned long __user *)newsp))
689 regs->gpr[1] = (unsigned long) newsp;
691 regs->gpr[4] = (unsigned long) &rt_sf->info;
692 regs->gpr[5] = (unsigned long) &rt_sf->uc;
693 regs->gpr[6] = (unsigned long) rt_sf;
694 regs->nip = (unsigned long) ka->sa.sa_handler;
695 regs->link = (unsigned long) frame->tramp;
703 printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
706 force_sigsegv(sig, current);
709 static long do_setcontext32(struct ucontext32 __user *ucp, struct pt_regs *regs, int sig)
711 compat_sigset_t c_set;
715 if (__copy_from_user(&c_set, &ucp->uc_sigmask, sizeof(c_set))
716 || __get_user(mcp, &ucp->uc_regs))
718 sigset_from_compat(&set, &c_set);
719 restore_sigmask(&set);
720 if (restore_user_regs(regs, (struct mcontext32 __user *)(u64)mcp, sig))
727 * Handle {get,set,swap}_context operations for 32 bits processes
730 long sys32_swapcontext(struct ucontext32 __user *old_ctx,
731 struct ucontext32 __user *new_ctx,
732 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
735 compat_sigset_t c_set;
737 /* Context size is for future use. Right now, we only make sure
738 * we are passed something we understand
740 if (ctx_size < sizeof(struct ucontext32))
743 if (old_ctx != NULL) {
744 compat_from_sigset(&c_set, ¤t->blocked);
745 if (verify_area(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
746 || save_user_regs(regs, &old_ctx->uc_mcontext, 0)
747 || __copy_to_user(&old_ctx->uc_sigmask, &c_set, sizeof(c_set))
748 || __put_user((u32)(u64)&old_ctx->uc_mcontext, &old_ctx->uc_regs))
753 if (verify_area(VERIFY_READ, new_ctx, sizeof(*new_ctx))
754 || __get_user(tmp, (u8 __user *) new_ctx)
755 || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1))
759 * If we get a fault copying the context into the kernel's
760 * image of the user's registers, we can't just return -EFAULT
761 * because the user's registers will be corrupted. For instance
762 * the NIP value may have been updated but not some of the
763 * other registers. Given that we have done the verify_area
764 * and successfully read the first and last bytes of the region
765 * above, this should only happen in an out-of-memory situation
766 * or if another thread unmaps the region containing the context.
767 * We kill the task with a SIGSEGV in this situation.
769 if (do_setcontext32(new_ctx, regs, 0))
775 long sys32_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
776 struct pt_regs *regs)
778 struct rt_sigframe32 __user *rt_sf;
782 /* Always make any pending restarted system calls return -EINTR */
783 current_thread_info()->restart_block.fn = do_no_restart_syscall;
785 rt_sf = (struct rt_sigframe32 __user *)
786 (regs->gpr[1] + __SIGNAL_FRAMESIZE32 + 16);
787 if (verify_area(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
789 if (do_setcontext32(&rt_sf->uc, regs, 1))
793 * It's not clear whether or why it is desirable to save the
794 * sigaltstack setting on signal delivery and restore it on
795 * signal return. But other architectures do this and we have
796 * always done it up until now so it is probably better not to
797 * change it. -- paulus
798 * We use the sys32_ version that does the 32/64 bits conversion
799 * and takes userland pointer directly. What about error checking ?
802 sys32_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs);
809 force_sig(SIGSEGV, current);
815 * OK, we're invoking a handler
817 static void handle_signal32(unsigned long sig, struct k_sigaction *ka,
818 siginfo_t *info, sigset_t *oldset,
819 struct pt_regs * regs, unsigned long newsp)
821 struct sigcontext32 __user *sc;
822 struct sigregs32 __user *frame;
823 unsigned long origsp = newsp;
825 /* Set up Signal Frame */
826 newsp -= sizeof(struct sigregs32);
827 frame = (struct sigregs32 __user *) newsp;
829 /* Put a sigcontext on the stack */
830 newsp -= sizeof(*sc);
831 sc = (struct sigcontext32 __user *) newsp;
833 /* create a stack frame for the caller of the handler */
834 newsp -= __SIGNAL_FRAMESIZE32;
836 if (verify_area(VERIFY_WRITE, (void __user *) newsp, origsp - newsp))
840 #error "Please adjust handle_signal32()"
842 if (__put_user((u32)(u64)ka->sa.sa_handler, &sc->handler)
843 || __put_user(oldset->sig[0], &sc->oldmask)
844 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
845 || __put_user((u32)(u64)frame, &sc->regs)
846 || __put_user(sig, &sc->signal))
849 if (save_user_regs(regs, &frame->mctx, __NR_sigreturn))
852 if (put_user(regs->gpr[1], (unsigned long __user *)newsp))
854 regs->gpr[1] = (unsigned long) newsp;
856 regs->gpr[4] = (unsigned long) sc;
857 regs->nip = (unsigned long) ka->sa.sa_handler;
858 regs->link = (unsigned long) frame->mctx.tramp;
866 printk("badframe in handle_signal, regs=%p frame=%x newsp=%x\n",
867 regs, frame, *newspp);
869 force_sigsegv(sig, current);
873 * Do a signal return; undo the signal stack.
875 long sys32_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
876 struct pt_regs *regs)
878 struct sigcontext32 __user *sc;
879 struct sigcontext32 sigctx;
880 struct mcontext32 __user *sr;
884 /* Always make any pending restarted system calls return -EINTR */
885 current_thread_info()->restart_block.fn = do_no_restart_syscall;
887 sc = (struct sigcontext32 __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE32);
888 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
892 * Note that PPC32 puts the upper 32 bits of the sigmask in the
893 * unused part of the signal stackframe
895 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
896 restore_sigmask(&set);
898 sr = (struct mcontext32 __user *)(u64)sigctx.regs;
899 if (verify_area(VERIFY_READ, sr, sizeof(*sr))
900 || restore_user_regs(regs, sr, 1))
907 force_sig(SIGSEGV, current);
914 * Start of do_signal32 routine
916 * This routine gets control when a pending signal needs to be processed
917 * in the 32 bit target thread -
919 * It handles both rt and non-rt signals
923 * Note that 'init' is a special process: it doesn't get signals it doesn't
924 * want to handle. Thus you cannot kill init even with a SIGKILL even by
928 int do_signal32(sigset_t *oldset, struct pt_regs *regs)
931 unsigned int frame, newsp;
933 struct k_sigaction ka;
936 oldset = ¤t->blocked;
940 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
942 if (TRAP(regs) == 0x0C00 /* System Call! */
943 && regs->ccr & 0x10000000 /* error signalled */
944 && ((ret = regs->gpr[3]) == ERESTARTSYS
945 || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR
946 || ret == ERESTART_RESTARTBLOCK)) {
949 && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK
950 || (ret == ERESTARTSYS
951 && !(ka.sa.sa_flags & SA_RESTART)))) {
952 /* make the system call return an EINTR error */
953 regs->result = -EINTR;
954 regs->gpr[3] = EINTR;
955 /* note that the cr0.SO bit is already set */
957 regs->nip -= 4; /* Back up & retry system call */
960 if (ret == ERESTART_RESTARTBLOCK)
961 regs->gpr[0] = __NR_restart_syscall;
963 regs->gpr[3] = regs->orig_gpr3;
968 return 0; /* no signals delivered */
970 if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size
971 && (!on_sig_stack(regs->gpr[1])))
972 newsp = (current->sas_ss_sp + current->sas_ss_size);
974 newsp = regs->gpr[1];
977 /* Whee! Actually deliver the signal. */
978 if (ka.sa.sa_flags & SA_SIGINFO)
979 handle_rt_signal32(signr, &ka, &info, oldset, regs, newsp);
981 handle_signal32(signr, &ka, &info, oldset, regs, newsp);
983 if (!(ka.sa.sa_flags & SA_NODEFER)) {
984 spin_lock_irq(¤t->sighand->siglock);
985 sigorsets(¤t->blocked, ¤t->blocked,
987 sigaddset(¤t->blocked, signr);
989 spin_unlock_irq(¤t->sighand->siglock);