signal.c
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上传日期:2013-02-24
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文件大小:31k
- /*
- * 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 <linux/sched.h>
- #include <linux/mm.h>
- #include <linux/kernel.h>
- #include <linux/signal.h>
- #include <linux/errno.h>
- #include <linux/wait.h>
- #include <linux/ptrace.h>
- #include <linux/unistd.h>
- #include <linux/stddef.h>
- #include <linux/highuid.h>
- #include <asm/setup.h>
- #include <asm/uaccess.h>
- #include <asm/pgtable.h>
- #include <asm/traps.h>
- #include <asm/ucontext.h>
- #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
- 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/68881nt"
- "fmovemx %0,%/fp0-%/fp1nt"
- "fmoveml %1,%/fpcr/%/fpsr/%/fpiarnt"
- ".chip 68k"
- : /* no outputs */
- : "m" (*sc->sc_fpregs), "m" (*sc->sc_fpcntl));
- }
- __asm__ volatile (".chip 68k/68881nt"
- "frestore %0nt"
- ".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/68881nt"
- "fmovemx %0,%/fp0-%/fp7nt"
- "fmoveml %1,%/fpcr/%/fpsr/%/fpiarnt"
- ".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/68881nt"
- "frestore %0nt"
- ".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 formatn");
- #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,%/a0nt"
- " subl %1,%/a0nt" /* make room on stack */
- " movel %/a0,%/spnt" /* set stack pointer */
- /* move switch_stack and pt_regs */
- "1: movel %0@+,%/a0@+nt"
- " dbra %2,1bnt"
- " lea %/sp@(%c3),%/a0nt" /* add offset of fmt */
- " lsrl #2,%1nt"
- " subql #1,%1nt"
- "2: movesl %4@+,%2nt"
- "3: movel %2,%/a0@+nt"
- " dbra %1,2bnt"
- " bral " SYMBOL_NAME_STR(ret_from_signal) "n"
- "4:n"
- ".section __ex_table,"a"n"
- " .align 4n"
- " .long 2b,4bn"
- " .long 3b,4bn"
- ".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 formatn");
- #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,%/a0nt"
- " subl %1,%/a0nt" /* make room on stack */
- " movel %/a0,%/spnt" /* set stack pointer */
- /* move switch_stack and pt_regs */
- "1: movel %0@+,%/a0@+nt"
- " dbra %2,1bnt"
- " lea %/sp@(%c3),%/a0nt" /* add offset of fmt */
- " lsrl #2,%1nt"
- " subql #1,%1nt"
- "2: movesl %4@+,%2nt"
- "3: movel %2,%/a0@+nt"
- " dbra %1,2bnt"
- " bral " SYMBOL_NAME_STR(ret_from_signal) "n"
- "4:n"
- ".section __ex_table,"a"n"
- " .align 4n"
- " .long 2b,4bn"
- " .long 3b,4bn"
- ".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/68881nt"
- "fsave %0nt"
- ".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/68881nt"
- "fmovemx %/fp0-%/fp1,%0nt"
- "fmoveml %/fpcr/%/fpsr/%/fpiar,%1nt"
- ".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/68881nt"
- "fsave %0nt"
- ".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/68881nt"
- "fmovemx %/fp0-%/fp7,%0nt"
- "fmoveml %/fpcr/%/fpsr/%/fpiar,%1nt"
- ".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 68040nt"
- "nopnt"
- "ptestr (%1)nt"
- "movec %%mmusr,%0nt"
- ".chip 68k"
- : "=r" (temp)
- : "a" (vaddr));
- temp &= PAGE_MASK;
- temp |= vaddr & ~PAGE_MASK;
- __asm__ __volatile__ (".chip 68040nt"
- "nopnt"
- "cpushl %%bc,(%0)nt"
- ".chip 68k"
- : : "a" (temp));
- }
- else if (CPU_IS_060) {
- unsigned long temp;
- __asm__ __volatile__ (".chip 68060nt"
- "plpar (%0)nt"
- ".chip 68k"
- : "=a" (temp)
- : "0" (vaddr));
- __asm__ __volatile__ (".chip 68060nt"
- "cpushl %%bc,(%0)nt"
- ".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,%%caarnt"
- "movec %1,%%cacr"
- : : "r" (vaddr), "r" (temp));
- asm volatile ("movec %0,%%caarnt"
- "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 %#xn",
- 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=%04xn", 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 %#xn",
- 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=%04xn", 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;
- }