/* * linux/arch/m68k/kernel/signal.c * * Copyright (C) 1991, 1992 Linus Torvalds * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. */ /* * Linux/m68k support by Hamish Macdonald * * 68060 fixes by Jesper Skov * * 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab * * mathemu support by Roman Zippel * (Note: fpstate in the signal context is completly ignored for the emulator * and the internal floating point format is put on stack) */ /* * ++roman (07/09/96): implemented signal stacks (specially for tosemu on * Atari :-) Current limitation: Only one sigstack can be active at one time. * If a second signal with SA_ONSTACK set arrives while working on a sigstack, * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested * signal handlers! */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) asmlinkage int sys_wait4(pid_t pid, unsigned long *stat_addr, int options, unsigned long *ru); asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs); const int frame_extra_sizes[16] = { 0, -1, /* sizeof(((struct frame *)0)->un.fmt1), */ sizeof(((struct frame *)0)->un.fmt2), sizeof(((struct frame *)0)->un.fmt3), sizeof(((struct frame *)0)->un.fmt4), -1, /* sizeof(((struct frame *)0)->un.fmt5), */ -1, /* sizeof(((struct frame *)0)->un.fmt6), */ sizeof(((struct frame *)0)->un.fmt7), -1, /* sizeof(((struct frame *)0)->un.fmt8), */ sizeof(((struct frame *)0)->un.fmt9), sizeof(((struct frame *)0)->un.fmta), sizeof(((struct frame *)0)->un.fmtb), -1, /* sizeof(((struct frame *)0)->un.fmtc), */ -1, /* sizeof(((struct frame *)0)->un.fmtd), */ -1, /* sizeof(((struct frame *)0)->un.fmte), */ -1, /* sizeof(((struct frame *)0)->un.fmtf), */ }; /* * Atomically swap in the new signal mask, and wait for a signal. */ asmlinkage int do_sigsuspend(struct pt_regs *regs) { old_sigset_t mask = regs->d3; sigset_t saveset; mask &= _BLOCKABLE; saveset = current->blocked; siginitset(¤t->blocked, mask); recalc_sigpending(current); regs->d0 = -EINTR; while (1) { current->state = TASK_INTERRUPTIBLE; schedule(); if (do_signal(&saveset, regs)) return -EINTR; } } asmlinkage int do_rt_sigsuspend(struct pt_regs *regs) { sigset_t *unewset = (sigset_t *)regs->d1; size_t sigsetsize = (size_t)regs->d2; sigset_t saveset, newset; /* XXX: Don't preclude handling different sized sigset_t's. */ if (sigsetsize != sizeof(sigset_t)) return -EINVAL; if (copy_from_user(&newset, unewset, sizeof(newset))) return -EFAULT; sigdelsetmask(&newset, ~_BLOCKABLE); saveset = current->blocked; current->blocked = newset; recalc_sigpending(current); regs->d0 = -EINTR; while (1) { current->state = TASK_INTERRUPTIBLE; schedule(); if (do_signal(&saveset, regs)) return -EINTR; } } asmlinkage int sys_sigaction(int sig, const struct old_sigaction *act, struct old_sigaction *oact) { struct k_sigaction new_ka, old_ka; int ret; if (act) { old_sigset_t mask; if (verify_area(VERIFY_READ, act, sizeof(*act)) || __get_user(new_ka.sa.sa_handler, &act->sa_handler) || __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) return -EFAULT; __get_user(new_ka.sa.sa_flags, &act->sa_flags); __get_user(mask, &act->sa_mask); siginitset(&new_ka.sa.sa_mask, mask); } ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); if (!ret && oact) { if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) || __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) return -EFAULT; __put_user(old_ka.sa.sa_flags, &oact->sa_flags); __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); } return ret; } asmlinkage int sys_sigaltstack(const stack_t *uss, stack_t *uoss) { return do_sigaltstack(uss, uoss, rdusp()); } /* * Do a signal return; undo the signal stack. * * Keep the return code on the stack quadword aligned! * That makes the cache flush below easier. */ struct sigframe { char *pretcode; int sig; int code; struct sigcontext *psc; char retcode[8]; unsigned long extramask[_NSIG_WORDS-1]; struct sigcontext sc; }; struct rt_sigframe { char *pretcode; int sig; struct siginfo *pinfo; void *puc; char retcode[8]; struct siginfo info; struct ucontext uc; }; int copy_siginfo_to_user(siginfo_t *to, siginfo_t *from) { if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t))) return -EFAULT; if (from->si_code < 0) return __copy_to_user(to, from, sizeof(siginfo_t)); else { int err; /* If you change siginfo_t structure, please be sure this code is fixed accordingly. It should never copy any pad contained in the structure to avoid security leaks, but must copy the generic 3 ints plus the relevant union member. */ err = __put_user(from->si_signo, &to->si_signo); err |= __put_user(from->si_errno, &to->si_errno); err |= __put_user((short)from->si_code, &to->si_code); /* First 32bits of unions are always present. */ err |= __put_user(from->si_pid, &to->si_pid); switch (from->si_code >> 16) { case __SI_FAULT >> 16: break; case __SI_CHLD >> 16: err |= __put_user(from->si_utime, &to->si_utime); err |= __put_user(from->si_stime, &to->si_stime); err |= __put_user(from->si_status, &to->si_status); default: err |= __put_user(from->si_uid, &to->si_uid); break; /* case __SI_RT: This is not generated by the kernel as of now. */ } return err; } } static unsigned char fpu_version = 0; /* version number of fpu, set by setup_frame */ static inline int restore_fpu_state(struct sigcontext *sc) { int err = 1; if (FPU_IS_EMU) { /* restore registers */ memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); memcpy(current->thread.fp, sc->sc_fpregs, 24); return 0; } if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { /* Verify the frame format. */ if (!CPU_IS_060 && (sc->sc_fpstate[0] != fpu_version)) goto out; if (CPU_IS_020_OR_030) { if (m68k_fputype & FPU_68881 && !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4)) goto out; if (m68k_fputype & FPU_68882 && !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4)) goto out; } else if (CPU_IS_040) { if (!(sc->sc_fpstate[1] == 0x00 || sc->sc_fpstate[1] == 0x28 || sc->sc_fpstate[1] == 0x60)) goto out; } else if (CPU_IS_060) { if (!(sc->sc_fpstate[3] == 0x00 || sc->sc_fpstate[3] == 0x60 || sc->sc_fpstate[3] == 0xe0)) goto out; } else goto out; __asm__ volatile (".chip 68k/68881\n\t" "fmovemx %0,%/fp0-%/fp1\n\t" "fmoveml %1,%/fpcr/%/fpsr/%/fpiar\n\t" ".chip 68k" : /* no outputs */ : "m" (*sc->sc_fpregs), "m" (*sc->sc_fpcntl)); } __asm__ volatile (".chip 68k/68881\n\t" "frestore %0\n\t" ".chip 68k" : : "m" (*sc->sc_fpstate)); err = 0; out: return err; } #define FPCONTEXT_SIZE 216 #define uc_fpstate uc_filler[0] #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4] #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1] static inline int rt_restore_fpu_state(struct ucontext *uc) { unsigned char fpstate[FPCONTEXT_SIZE]; int context_size = CPU_IS_060 ? 8 : 0; fpregset_t fpregs; int err = 1; if (FPU_IS_EMU) { /* restore fpu control register */ if (__copy_from_user(current->thread.fpcntl, &uc->uc_mcontext.fpregs.f_pcr, 12)) goto out; /* restore all other fpu register */ if (__copy_from_user(current->thread.fp, uc->uc_mcontext.fpregs.f_fpregs, 96)) goto out; return 0; } if (__get_user(*(long *)fpstate, (long *)&uc->uc_fpstate)) goto out; if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { if (!CPU_IS_060) context_size = fpstate[1]; /* Verify the frame format. */ if (!CPU_IS_060 && (fpstate[0] != fpu_version)) goto out; if (CPU_IS_020_OR_030) { if (m68k_fputype & FPU_68881 && !(context_size == 0x18 || context_size == 0xb4)) goto out; if (m68k_fputype & FPU_68882 && !(context_size == 0x38 || context_size == 0xd4)) goto out; } else if (CPU_IS_040) { if (!(context_size == 0x00 || context_size == 0x28 || context_size == 0x60)) goto out; } else if (CPU_IS_060) { if (!(fpstate[3] == 0x00 || fpstate[3] == 0x60 || fpstate[3] == 0xe0)) goto out; } else goto out; if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs, sizeof(fpregs))) goto out; __asm__ volatile (".chip 68k/68881\n\t" "fmovemx %0,%/fp0-%/fp7\n\t" "fmoveml %1,%/fpcr/%/fpsr/%/fpiar\n\t" ".chip 68k" : /* no outputs */ : "m" (*fpregs.f_fpregs), "m" (fpregs.f_pcr)); } if (context_size && __copy_from_user(fpstate + 4, (long *)&uc->uc_fpstate + 1, context_size)) goto out; __asm__ volatile (".chip 68k/68881\n\t" "frestore %0\n\t" ".chip 68k" : : "m" (*fpstate)); err = 0; out: return err; } static inline int restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc, void *fp, int *pd0) { int fsize, formatvec; struct sigcontext context; int err; /* get previous context */ if (copy_from_user(&context, usc, sizeof(context))) goto badframe; /* restore passed registers */ regs->d1 = context.sc_d1; regs->a0 = context.sc_a0; regs->a1 = context.sc_a1; regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff); regs->pc = context.sc_pc; regs->orig_d0 = -1; /* disable syscall checks */ wrusp(context.sc_usp); formatvec = context.sc_formatvec; regs->format = formatvec >> 12; regs->vector = formatvec & 0xfff; err = restore_fpu_state(&context); fsize = frame_extra_sizes[regs->format]; if (fsize < 0) { /* * user process trying to return with weird frame format */ #if DEBUG printk("user process returning with weird frame format\n"); #endif goto badframe; } /* OK. Make room on the supervisor stack for the extra junk, * if necessary. */ if (fsize) { struct switch_stack *sw = (struct switch_stack *)regs - 1; regs->d0 = context.sc_d0; #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack)) __asm__ __volatile__ (" movel %0,%/a0\n\t" " subl %1,%/a0\n\t" /* make room on stack */ " movel %/a0,%/sp\n\t" /* set stack pointer */ /* move switch_stack and pt_regs */ "1: movel %0@+,%/a0@+\n\t" " dbra %2,1b\n\t" " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */ " lsrl #2,%1\n\t" " subql #1,%1\n\t" "2: movesl %4@+,%2\n\t" "3: movel %2,%/a0@+\n\t" " dbra %1,2b\n\t" " bral " SYMBOL_NAME_STR(ret_from_signal) "\n" "4:\n" ".section __ex_table,\"a\"\n" " .align 4\n" " .long 2b,4b\n" " .long 3b,4b\n" ".previous" : /* no outputs, it doesn't ever return */ : "a" (sw), "d" (fsize), "d" (frame_offset/4-1), "n" (frame_offset), "a" (fp) : "a0"); #undef frame_offset /* * If we ever get here an exception occurred while * building the above stack-frame. */ goto badframe; } *pd0 = context.sc_d0; return err; badframe: return 1; } static inline int rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, struct ucontext *uc, int *pd0) { int fsize, temp; greg_t *gregs = uc->uc_mcontext.gregs; unsigned long usp; int err; err = __get_user(temp, &uc->uc_mcontext.version); if (temp != MCONTEXT_VERSION) goto badframe; /* restore passed registers */ err |= __get_user(regs->d0, &gregs[0]); err |= __get_user(regs->d1, &gregs[1]); err |= __get_user(regs->d2, &gregs[2]); err |= __get_user(regs->d3, &gregs[3]); err |= __get_user(regs->d4, &gregs[4]); err |= __get_user(regs->d5, &gregs[5]); err |= __get_user(sw->d6, &gregs[6]); err |= __get_user(sw->d7, &gregs[7]); err |= __get_user(regs->a0, &gregs[8]); err |= __get_user(regs->a1, &gregs[9]); err |= __get_user(regs->a2, &gregs[10]); err |= __get_user(sw->a3, &gregs[11]); err |= __get_user(sw->a4, &gregs[12]); err |= __get_user(sw->a5, &gregs[13]); err |= __get_user(sw->a6, &gregs[14]); err |= __get_user(usp, &gregs[15]); wrusp(usp); err |= __get_user(regs->pc, &gregs[16]); err |= __get_user(temp, &gregs[17]); regs->sr = (regs->sr & 0xff00) | (temp & 0xff); regs->orig_d0 = -1; /* disable syscall checks */ err |= __get_user(temp, &uc->uc_formatvec); regs->format = temp >> 12; regs->vector = temp & 0xfff; err |= rt_restore_fpu_state(uc); if (do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT) goto badframe; fsize = frame_extra_sizes[regs->format]; if (fsize < 0) { /* * user process trying to return with weird frame format */ #if DEBUG printk("user process returning with weird frame format\n"); #endif goto badframe; } /* OK. Make room on the supervisor stack for the extra junk, * if necessary. */ if (fsize) { #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack)) __asm__ __volatile__ (" movel %0,%/a0\n\t" " subl %1,%/a0\n\t" /* make room on stack */ " movel %/a0,%/sp\n\t" /* set stack pointer */ /* move switch_stack and pt_regs */ "1: movel %0@+,%/a0@+\n\t" " dbra %2,1b\n\t" " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */ " lsrl #2,%1\n\t" " subql #1,%1\n\t" "2: movesl %4@+,%2\n\t" "3: movel %2,%/a0@+\n\t" " dbra %1,2b\n\t" " bral " SYMBOL_NAME_STR(ret_from_signal) "\n" "4:\n" ".section __ex_table,\"a\"\n" " .align 4\n" " .long 2b,4b\n" " .long 3b,4b\n" ".previous" : /* no outputs, it doesn't ever return */ : "a" (sw), "d" (fsize), "d" (frame_offset/4-1), "n" (frame_offset), "a" (&uc->uc_extra) : "a0"); #undef frame_offset /* * If we ever get here an exception occurred while * building the above stack-frame. */ goto badframe; } *pd0 = regs->d0; return err; badframe: return 1; } asmlinkage int do_sigreturn(unsigned long __unused) { struct switch_stack *sw = (struct switch_stack *) &__unused; struct pt_regs *regs = (struct pt_regs *) (sw + 1); unsigned long usp = rdusp(); struct sigframe *frame = (struct sigframe *)(usp - 4); sigset_t set; int d0; if (verify_area(VERIFY_READ, frame, sizeof(*frame))) goto badframe; if (__get_user(set.sig[0], &frame->sc.sc_mask) || (_NSIG_WORDS > 1 && __copy_from_user(&set.sig[1], &frame->extramask, sizeof(frame->extramask)))) goto badframe; sigdelsetmask(&set, ~_BLOCKABLE); current->blocked = set; recalc_sigpending(current); if (restore_sigcontext(regs, &frame->sc, frame + 1, &d0)) goto badframe; return d0; badframe: force_sig(SIGSEGV, current); return 0; } asmlinkage int do_rt_sigreturn(unsigned long __unused) { struct switch_stack *sw = (struct switch_stack *) &__unused; struct pt_regs *regs = (struct pt_regs *) (sw + 1); unsigned long usp = rdusp(); struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4); sigset_t set; int d0; if (verify_area(VERIFY_READ, frame, sizeof(*frame))) goto badframe; if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) goto badframe; sigdelsetmask(&set, ~_BLOCKABLE); current->blocked = set; recalc_sigpending(current); if (rt_restore_ucontext(regs, sw, &frame->uc, &d0)) goto badframe; return d0; badframe: force_sig(SIGSEGV, current); return 0; } /* * Set up a signal frame. */ static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) { if (FPU_IS_EMU) { /* save registers */ memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12); memcpy(sc->sc_fpregs, current->thread.fp, 24); return; } __asm__ volatile (".chip 68k/68881\n\t" "fsave %0\n\t" ".chip 68k" : : "m" (*sc->sc_fpstate) : "memory"); if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { fpu_version = sc->sc_fpstate[0]; if (CPU_IS_020_OR_030 && regs->vector >= (VEC_FPBRUC * 4) && regs->vector <= (VEC_FPNAN * 4)) { /* Clear pending exception in 68882 idle frame */ if (*(unsigned short *) sc->sc_fpstate == 0x1f38) sc->sc_fpstate[0x38] |= 1 << 3; } __asm__ volatile (".chip 68k/68881\n\t" "fmovemx %/fp0-%/fp1,%0\n\t" "fmoveml %/fpcr/%/fpsr/%/fpiar,%1\n\t" ".chip 68k" : /* no outputs */ : "m" (*sc->sc_fpregs), "m" (*sc->sc_fpcntl) : "memory"); } } static inline int rt_save_fpu_state(struct ucontext *uc, struct pt_regs *regs) { unsigned char fpstate[FPCONTEXT_SIZE]; int context_size = CPU_IS_060 ? 8 : 0; int err = 0; if (FPU_IS_EMU) { /* save fpu control register */ err |= copy_to_user(&uc->uc_mcontext.fpregs.f_pcr, current->thread.fpcntl, 12); /* save all other fpu register */ err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs, current->thread.fp, 96); return err; } __asm__ volatile (".chip 68k/68881\n\t" "fsave %0\n\t" ".chip 68k" : : "m" (*fpstate) : "memory"); err |= __put_user(*(long *)fpstate, (long *)&uc->uc_fpstate); if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { fpregset_t fpregs; if (!CPU_IS_060) context_size = fpstate[1]; fpu_version = fpstate[0]; if (CPU_IS_020_OR_030 && regs->vector >= (VEC_FPBRUC * 4) && regs->vector <= (VEC_FPNAN * 4)) { /* Clear pending exception in 68882 idle frame */ if (*(unsigned short *) fpstate == 0x1f38) fpstate[0x38] |= 1 << 3; } __asm__ volatile (".chip 68k/68881\n\t" "fmovemx %/fp0-%/fp7,%0\n\t" "fmoveml %/fpcr/%/fpsr/%/fpiar,%1\n\t" ".chip 68k" : /* no outputs */ : "m" (*fpregs.f_fpregs), "m" (fpregs.f_pcr) : "memory"); err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs, sizeof(fpregs)); } if (context_size) err |= copy_to_user((long *)&uc->uc_fpstate + 1, fpstate + 4, context_size); return err; } static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, unsigned long mask) { sc->sc_mask = mask; sc->sc_usp = rdusp(); sc->sc_d0 = regs->d0; sc->sc_d1 = regs->d1; sc->sc_a0 = regs->a0; sc->sc_a1 = regs->a1; sc->sc_sr = regs->sr; sc->sc_pc = regs->pc; sc->sc_formatvec = regs->format << 12 | regs->vector; save_fpu_state(sc, regs); } static inline int rt_setup_ucontext(struct ucontext *uc, struct pt_regs *regs) { struct switch_stack *sw = (struct switch_stack *)regs - 1; greg_t *gregs = uc->uc_mcontext.gregs; int err = 0; err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); err |= __put_user(regs->d0, &gregs[0]); err |= __put_user(regs->d1, &gregs[1]); err |= __put_user(regs->d2, &gregs[2]); err |= __put_user(regs->d3, &gregs[3]); err |= __put_user(regs->d4, &gregs[4]); err |= __put_user(regs->d5, &gregs[5]); err |= __put_user(sw->d6, &gregs[6]); err |= __put_user(sw->d7, &gregs[7]); err |= __put_user(regs->a0, &gregs[8]); err |= __put_user(regs->a1, &gregs[9]); err |= __put_user(regs->a2, &gregs[10]); err |= __put_user(sw->a3, &gregs[11]); err |= __put_user(sw->a4, &gregs[12]); err |= __put_user(sw->a5, &gregs[13]); err |= __put_user(sw->a6, &gregs[14]); err |= __put_user(rdusp(), &gregs[15]); err |= __put_user(regs->pc, &gregs[16]); err |= __put_user(regs->sr, &gregs[17]); err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec); err |= rt_save_fpu_state(uc, regs); return err; } static inline void push_cache (unsigned long vaddr) { /* * Using the old cache_push_v() was really a big waste. * * What we are trying to do is to flush 8 bytes to ram. * Flushing 2 cache lines of 16 bytes is much cheaper than * flushing 1 or 2 pages, as previously done in * cache_push_v(). * Jes */ if (CPU_IS_040) { unsigned long temp; __asm__ __volatile__ (".chip 68040\n\t" "nop\n\t" "ptestr (%1)\n\t" "movec %%mmusr,%0\n\t" ".chip 68k" : "=r" (temp) : "a" (vaddr)); temp &= PAGE_MASK; temp |= vaddr & ~PAGE_MASK; __asm__ __volatile__ (".chip 68040\n\t" "nop\n\t" "cpushl %%bc,(%0)\n\t" ".chip 68k" : : "a" (temp)); } else if (CPU_IS_060) { unsigned long temp; __asm__ __volatile__ (".chip 68060\n\t" "plpar (%0)\n\t" ".chip 68k" : "=a" (temp) : "0" (vaddr)); __asm__ __volatile__ (".chip 68060\n\t" "cpushl %%bc,(%0)\n\t" ".chip 68k" : : "a" (temp)); } else { /* * 68030/68020 have no writeback cache; * still need to clear icache. * Note that vaddr is guaranteed to be long word aligned. */ unsigned long temp; asm volatile ("movec %%cacr,%0" : "=r" (temp)); temp += 4; asm volatile ("movec %0,%%caar\n\t" "movec %1,%%cacr" : : "r" (vaddr), "r" (temp)); asm volatile ("movec %0,%%caar\n\t" "movec %1,%%cacr" : : "r" (vaddr + 4), "r" (temp)); } } static inline void * get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) { unsigned long usp; /* Default to using normal stack. */ usp = rdusp(); /* This is the X/Open sanctioned signal stack switching. */ if (ka->sa.sa_flags & SA_ONSTACK) { if (!on_sig_stack(usp)) usp = current->sas_ss_sp + current->sas_ss_size; } return (void *)((usp - frame_size) & -8UL); } static void setup_frame (int sig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs) { struct sigframe *frame; int fsize = frame_extra_sizes[regs->format]; struct sigcontext context; int err = 0; if (fsize < 0) { #ifdef DEBUG printk ("setup_frame: Unknown frame format %#x\n", regs->format); #endif goto give_sigsegv; } frame = get_sigframe(ka, regs, sizeof(*frame) + fsize); if (fsize) { err |= copy_to_user (frame + 1, regs + 1, fsize); regs->stkadj = fsize; } err |= __put_user((current->exec_domain && current->exec_domain->signal_invmap && sig < 32 ? current->exec_domain->signal_invmap[sig] : sig), &frame->sig); err |= __put_user(regs->vector, &frame->code); err |= __put_user(&frame->sc, &frame->psc); if (_NSIG_WORDS > 1) err |= copy_to_user(frame->extramask, &set->sig[1], sizeof(frame->extramask)); setup_sigcontext(&context, regs, set->sig[0]); err |= copy_to_user (&frame->sc, &context, sizeof(context)); /* Set up to return from userspace. */ err |= __put_user(frame->retcode, &frame->pretcode); /* moveq #,d0; trap #0 */ err |= __put_user(0x70004e40 + (__NR_sigreturn << 16), (long *)(frame->retcode)); if (err) goto give_sigsegv; push_cache ((unsigned long) &frame->retcode); /* Set up registers for signal handler */ wrusp ((unsigned long) frame); regs->pc = (unsigned long) ka->sa.sa_handler; adjust_stack: /* Prepare to skip over the extra stuff in the exception frame. */ if (regs->stkadj) { struct pt_regs *tregs = (struct pt_regs *)((ulong)regs + regs->stkadj); #if DEBUG printk("Performing stackadjust=%04x\n", regs->stkadj); #endif /* This must be copied with decreasing addresses to handle overlaps. */ tregs->vector = 0; tregs->format = 0; tregs->pc = regs->pc; tregs->sr = regs->sr; } return; give_sigsegv: if (sig == SIGSEGV) ka->sa.sa_handler = SIG_DFL; force_sig(SIGSEGV, current); goto adjust_stack; } static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set, struct pt_regs *regs) { struct rt_sigframe *frame; int fsize = frame_extra_sizes[regs->format]; int err = 0; if (fsize < 0) { #ifdef DEBUG printk ("setup_frame: Unknown frame format %#x\n", regs->format); #endif goto give_sigsegv; } frame = get_sigframe(ka, regs, sizeof(*frame)); if (fsize) { err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); regs->stkadj = fsize; } err |= __put_user((current->exec_domain && current->exec_domain->signal_invmap && sig < 32 ? current->exec_domain->signal_invmap[sig] : sig), &frame->sig); err |= __put_user(&frame->info, &frame->pinfo); err |= __put_user(&frame->uc, &frame->puc); err |= copy_siginfo_to_user(&frame->info, info); /* Create the ucontext. */ err |= __put_user(0, &frame->uc.uc_flags); err |= __put_user(0, &frame->uc.uc_link); err |= __put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); err |= __put_user(sas_ss_flags(rdusp()), &frame->uc.uc_stack.ss_flags); err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); err |= rt_setup_ucontext(&frame->uc, regs); err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); /* Set up to return from userspace. */ err |= __put_user(frame->retcode, &frame->pretcode); /* moveq #,d0; notb d0; trap #0 */ err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), (long *)(frame->retcode + 0)); err |= __put_user(0x4e40, (short *)(frame->retcode + 4)); if (err) goto give_sigsegv; push_cache ((unsigned long) &frame->retcode); /* Set up registers for signal handler */ wrusp ((unsigned long) frame); regs->pc = (unsigned long) ka->sa.sa_handler; adjust_stack: /* Prepare to skip over the extra stuff in the exception frame. */ if (regs->stkadj) { struct pt_regs *tregs = (struct pt_regs *)((ulong)regs + regs->stkadj); #if DEBUG printk("Performing stackadjust=%04x\n", regs->stkadj); #endif /* This must be copied with decreasing addresses to handle overlaps. */ tregs->vector = 0; tregs->format = 0; tregs->pc = regs->pc; tregs->sr = regs->sr; } return; give_sigsegv: if (sig == SIGSEGV) ka->sa.sa_handler = SIG_DFL; force_sig(SIGSEGV, current); goto adjust_stack; } static inline void handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) { switch (regs->d0) { case -ERESTARTNOHAND: if (!has_handler) goto do_restart; regs->d0 = -EINTR; break; case -ERESTARTSYS: if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { regs->d0 = -EINTR; break; } /* fallthrough */ case -ERESTARTNOINTR: do_restart: regs->d0 = regs->orig_d0; regs->pc -= 2; break; } } /* * OK, we're invoking a handler */ static void handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) { /* are we from a system call? */ if (regs->orig_d0 >= 0) /* If so, check system call restarting.. */ handle_restart(regs, ka, 1); /* set up the stack frame */ if (ka->sa.sa_flags & SA_SIGINFO) setup_rt_frame(sig, ka, info, oldset, regs); else setup_frame(sig, ka, oldset, regs); if (ka->sa.sa_flags & SA_ONESHOT) ka->sa.sa_handler = SIG_DFL; sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); if (!(ka->sa.sa_flags & SA_NODEFER)) sigaddset(¤t->blocked,sig); recalc_sigpending(current); } /* * Note that 'init' is a special process: it doesn't get signals it doesn't * want to handle. Thus you cannot kill init even with a SIGKILL even by * mistake. * * Note that we go through the signals twice: once to check the signals * that the kernel can handle, and then we build all the user-level signal * handling stack-frames in one go after that. */ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs) { siginfo_t info; struct k_sigaction *ka; current->thread.esp0 = (unsigned long) regs; if (!oldset) oldset = ¤t->blocked; for (;;) { int signr; signr = dequeue_signal(¤t->blocked, &info); if (!signr) break; if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) { current->exit_code = signr; current->state = TASK_STOPPED; regs->sr &= ~PS_T; /* Did we come from a system call? */ if (regs->orig_d0 >= 0) { /* Restart the system call the same way as if the process were not traced. */ struct k_sigaction *ka = ¤t->sig->action[signr-1]; int has_handler = (ka->sa.sa_handler != SIG_IGN && ka->sa.sa_handler != SIG_DFL); handle_restart(regs, ka, has_handler); } notify_parent(current, SIGCHLD); schedule(); /* We're back. Did the debugger cancel the sig? */ if (!(signr = current->exit_code)) { discard_frame: /* Make sure that a faulted bus cycle isn't restarted (only needed on the 680[23]0). */ if (regs->format == 10 || regs->format == 11) regs->stkadj = frame_extra_sizes[regs->format]; continue; } current->exit_code = 0; /* The debugger continued. Ignore SIGSTOP. */ if (signr == SIGSTOP) goto discard_frame; /* Update the siginfo structure. Is this good? */ if (signr != info.si_signo) { info.si_signo = signr; info.si_errno = 0; info.si_code = SI_USER; info.si_pid = current->p_pptr->pid; info.si_uid = current->p_pptr->uid; info.si_uid16 = high2lowuid(current->p_pptr->uid); } /* If the (new) signal is now blocked, requeue it. */ if (sigismember(¤t->blocked, signr)) { send_sig_info(signr, &info, current); continue; } } ka = ¤t->sig->action[signr-1]; if (ka->sa.sa_handler == SIG_IGN) { if (signr != SIGCHLD) continue; /* Check for SIGCHLD: it's special. */ while (sys_wait4(-1, NULL, WNOHANG, NULL) > 0) /* nothing */; continue; } if (ka->sa.sa_handler == SIG_DFL) { int exit_code = signr; if (current->pid == 1) continue; switch (signr) { case SIGCONT: case SIGCHLD: case SIGWINCH: case SIGURG: continue; case SIGTSTP: case SIGTTIN: case SIGTTOU: if (is_orphaned_pgrp(current->pgrp)) continue; /* FALLTHRU */ case SIGSTOP: current->state = TASK_STOPPED; current->exit_code = signr; if (!(current->p_pptr->sig->action[SIGCHLD-1] .sa.sa_flags & SA_NOCLDSTOP)) notify_parent(current, SIGCHLD); schedule(); continue; case SIGQUIT: case SIGILL: case SIGTRAP: case SIGIOT: case SIGFPE: case SIGSEGV: case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ: if (do_coredump(signr, regs)) exit_code |= 0x80; /* FALLTHRU */ default: sigaddset(¤t->pending.signal, signr); recalc_sigpending(current); current->flags |= PF_SIGNALED; do_exit(exit_code); /* NOTREACHED */ } } /* Whee! Actually deliver the signal. */ handle_signal(signr, ka, &info, oldset, regs); return 1; } /* Did we come from a system call? */ if (regs->orig_d0 >= 0) /* Restart the system call - no handlers present */ handle_restart(regs, NULL, 0); /* If we are about to discard some frame stuff we must copy over the remaining frame. */ if (regs->stkadj) { struct pt_regs *tregs = (struct pt_regs *) ((ulong) regs + regs->stkadj); /* This must be copied with decreasing addresses to handle overlaps. */ tregs->vector = 0; tregs->format = 0; tregs->pc = regs->pc; tregs->sr = regs->sr; } return 0; }