diff options
Diffstat (limited to 'arch/sh/kernel/signal.c')
| -rw-r--r-- | arch/sh/kernel/signal.c | 606 |
1 files changed, 0 insertions, 606 deletions
diff --git a/arch/sh/kernel/signal.c b/arch/sh/kernel/signal.c deleted file mode 100644 index b475c4d2405..00000000000 --- a/arch/sh/kernel/signal.c +++ /dev/null @@ -1,606 +0,0 @@ -/* - * linux/arch/sh/kernel/signal.c - * - * Copyright (C) 1991, 1992 Linus Torvalds - * - * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson - * - * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima - * - */ - -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/smp.h> -#include <linux/smp_lock.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/tty.h> -#include <linux/personality.h> -#include <linux/binfmts.h> - -#include <asm/ucontext.h> -#include <asm/uaccess.h> -#include <asm/pgtable.h> -#include <asm/cacheflush.h> - -#define DEBUG_SIG 0 - -#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) - -asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); - -/* - * Atomically swap in the new signal mask, and wait for a signal. - */ -asmlinkage int -sys_sigsuspend(old_sigset_t mask, - unsigned long r5, unsigned long r6, unsigned long r7, - struct pt_regs regs) -{ - sigset_t saveset; - - mask &= _BLOCKABLE; - spin_lock_irq(¤t->sighand->siglock); - saveset = current->blocked; - siginitset(¤t->blocked, mask); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - regs.regs[0] = -EINTR; - while (1) { - current->state = TASK_INTERRUPTIBLE; - schedule(); - if (do_signal(®s, &saveset)) - return -EINTR; - } -} - -asmlinkage int -sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, - unsigned long r6, unsigned long r7, - struct pt_regs regs) -{ - 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); - spin_lock_irq(¤t->sighand->siglock); - saveset = current->blocked; - current->blocked = newset; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - regs.regs[0] = -EINTR; - while (1) { - current->state = TASK_INTERRUPTIBLE; - schedule(); - if (do_signal(®s, &saveset)) - return -EINTR; - } -} - -asmlinkage int -sys_sigaction(int sig, const struct old_sigaction __user *act, - struct old_sigaction __user *oact) -{ - struct k_sigaction new_ka, old_ka; - int ret; - - if (act) { - old_sigset_t mask; - if (!access_ok(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 (!access_ok(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 __user *uss, stack_t __user *uoss, - unsigned long r6, unsigned long r7, - struct pt_regs regs) -{ - return do_sigaltstack(uss, uoss, regs.regs[15]); -} - - -/* - * Do a signal return; undo the signal stack. - */ - -#define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */ -#define TRAP16 0xc310 /* Syscall w/no args (NR in R3) */ -#define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */ - -struct sigframe -{ - struct sigcontext sc; - unsigned long extramask[_NSIG_WORDS-1]; - u16 retcode[8]; -}; - -struct rt_sigframe -{ - struct siginfo info; - struct ucontext uc; - u16 retcode[8]; -}; - -#ifdef CONFIG_SH_FPU -static inline int restore_sigcontext_fpu(struct sigcontext __user *sc) -{ - struct task_struct *tsk = current; - - if (!(cpu_data->flags & CPU_HAS_FPU)) - return 0; - - set_used_math(); - return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0], - sizeof(long)*(16*2+2)); -} - -static inline int save_sigcontext_fpu(struct sigcontext __user *sc, - struct pt_regs *regs) -{ - struct task_struct *tsk = current; - - if (!(cpu_data->flags & CPU_HAS_FPU)) - return 0; - - if (!used_math()) { - __put_user(0, &sc->sc_ownedfp); - return 0; - } - - __put_user(1, &sc->sc_ownedfp); - - /* This will cause a "finit" to be triggered by the next - attempted FPU operation by the 'current' process. - */ - clear_used_math(); - - unlazy_fpu(tsk, regs); - return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard, - sizeof(long)*(16*2+2)); -} -#endif /* CONFIG_SH_FPU */ - -static int -restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p) -{ - unsigned int err = 0; - -#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) - COPY(regs[1]); - COPY(regs[2]); COPY(regs[3]); - COPY(regs[4]); COPY(regs[5]); - COPY(regs[6]); COPY(regs[7]); - COPY(regs[8]); COPY(regs[9]); - COPY(regs[10]); COPY(regs[11]); - COPY(regs[12]); COPY(regs[13]); - COPY(regs[14]); COPY(regs[15]); - COPY(gbr); COPY(mach); - COPY(macl); COPY(pr); - COPY(sr); COPY(pc); -#undef COPY - -#ifdef CONFIG_SH_FPU - if (cpu_data->flags & CPU_HAS_FPU) { - int owned_fp; - struct task_struct *tsk = current; - - regs->sr |= SR_FD; /* Release FPU */ - clear_fpu(tsk, regs); - clear_used_math(); - __get_user (owned_fp, &sc->sc_ownedfp); - if (owned_fp) - err |= restore_sigcontext_fpu(sc); - } -#endif - - regs->tra = -1; /* disable syscall checks */ - err |= __get_user(*r0_p, &sc->sc_regs[0]); - return err; -} - -asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs regs) -{ - struct sigframe __user *frame = (struct sigframe __user *)regs.regs[15]; - sigset_t set; - int r0; - - if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; - - if (__get_user(set.sig[0], &frame->sc.oldmask) - || (_NSIG_WORDS > 1 - && __copy_from_user(&set.sig[1], &frame->extramask, - sizeof(frame->extramask)))) - goto badframe; - - sigdelsetmask(&set, ~_BLOCKABLE); - - spin_lock_irq(¤t->sighand->siglock); - current->blocked = set; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - if (restore_sigcontext(®s, &frame->sc, &r0)) - goto badframe; - return r0; - -badframe: - force_sig(SIGSEGV, current); - return 0; -} - -asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs regs) -{ - struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs.regs[15]; - sigset_t set; - stack_t st; - int r0; - - if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; - - if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) - goto badframe; - - sigdelsetmask(&set, ~_BLOCKABLE); - spin_lock_irq(¤t->sighand->siglock); - current->blocked = set; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - if (restore_sigcontext(®s, &frame->uc.uc_mcontext, &r0)) - goto badframe; - - if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) - goto badframe; - /* It is more difficult to avoid calling this function than to - call it and ignore errors. */ - do_sigaltstack(&st, NULL, regs.regs[15]); - - return r0; - -badframe: - force_sig(SIGSEGV, current); - return 0; -} - -/* - * Set up a signal frame. - */ - -static int -setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, - unsigned long mask) -{ - int err = 0; - -#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) - COPY(regs[0]); COPY(regs[1]); - COPY(regs[2]); COPY(regs[3]); - COPY(regs[4]); COPY(regs[5]); - COPY(regs[6]); COPY(regs[7]); - COPY(regs[8]); COPY(regs[9]); - COPY(regs[10]); COPY(regs[11]); - COPY(regs[12]); COPY(regs[13]); - COPY(regs[14]); COPY(regs[15]); - COPY(gbr); COPY(mach); - COPY(macl); COPY(pr); - COPY(sr); COPY(pc); -#undef COPY - -#ifdef CONFIG_SH_FPU - err |= save_sigcontext_fpu(sc, regs); -#endif - - /* non-iBCS2 extensions.. */ - err |= __put_user(mask, &sc->oldmask); - - return err; -} - -/* - * Determine which stack to use.. - */ -static inline void __user * -get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) -{ - if (ka->sa.sa_flags & SA_ONSTACK) { - if (sas_ss_flags(sp) == 0) - sp = current->sas_ss_sp + current->sas_ss_size; - } - - return (void __user *)((sp - frame_size) & -8ul); -} - -static void setup_frame(int sig, struct k_sigaction *ka, - sigset_t *set, struct pt_regs *regs) -{ - struct sigframe __user *frame; - int err = 0; - int signal; - - frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); - - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - goto give_sigsegv; - - signal = current_thread_info()->exec_domain - && current_thread_info()->exec_domain->signal_invmap - && sig < 32 - ? current_thread_info()->exec_domain->signal_invmap[sig] - : sig; - - err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); - - if (_NSIG_WORDS > 1) { - err |= __copy_to_user(frame->extramask, &set->sig[1], - sizeof(frame->extramask)); - } - - /* Set up to return from userspace. If provided, use a stub - already in userspace. */ - if (ka->sa.sa_flags & SA_RESTORER) { - regs->pr = (unsigned long) ka->sa.sa_restorer; - } else { - /* Generate return code (system call to sigreturn) */ - err |= __put_user(MOVW(7), &frame->retcode[0]); - err |= __put_user(TRAP16, &frame->retcode[1]); - err |= __put_user(OR_R0_R0, &frame->retcode[2]); - err |= __put_user(OR_R0_R0, &frame->retcode[3]); - err |= __put_user(OR_R0_R0, &frame->retcode[4]); - err |= __put_user(OR_R0_R0, &frame->retcode[5]); - err |= __put_user(OR_R0_R0, &frame->retcode[6]); - err |= __put_user((__NR_sigreturn), &frame->retcode[7]); - regs->pr = (unsigned long) frame->retcode; - } - - if (err) - goto give_sigsegv; - - /* Set up registers for signal handler */ - regs->regs[15] = (unsigned long) frame; - regs->regs[4] = signal; /* Arg for signal handler */ - regs->regs[5] = 0; - regs->regs[6] = (unsigned long) &frame->sc; - regs->pc = (unsigned long) ka->sa.sa_handler; - - set_fs(USER_DS); - -#if DEBUG_SIG - printk("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", - current->comm, current->pid, frame, regs->pc, regs->pr); -#endif - - flush_cache_sigtramp(regs->pr); - if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode)) - flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES); - return; - -give_sigsegv: - force_sigsegv(sig, current); -} - -static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, - sigset_t *set, struct pt_regs *regs) -{ - struct rt_sigframe __user *frame; - int err = 0; - int signal; - - frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); - - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - goto give_sigsegv; - - signal = current_thread_info()->exec_domain - && current_thread_info()->exec_domain->signal_invmap - && sig < 32 - ? current_thread_info()->exec_domain->signal_invmap[sig] - : sig; - - 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(regs->regs[15]), - &frame->uc.uc_stack.ss_flags); - err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); - err |= setup_sigcontext(&frame->uc.uc_mcontext, - regs, set->sig[0]); - err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); - - /* Set up to return from userspace. If provided, use a stub - already in userspace. */ - if (ka->sa.sa_flags & SA_RESTORER) { - regs->pr = (unsigned long) ka->sa.sa_restorer; - } else { - /* Generate return code (system call to rt_sigreturn) */ - err |= __put_user(MOVW(7), &frame->retcode[0]); - err |= __put_user(TRAP16, &frame->retcode[1]); - err |= __put_user(OR_R0_R0, &frame->retcode[2]); - err |= __put_user(OR_R0_R0, &frame->retcode[3]); - err |= __put_user(OR_R0_R0, &frame->retcode[4]); - err |= __put_user(OR_R0_R0, &frame->retcode[5]); - err |= __put_user(OR_R0_R0, &frame->retcode[6]); - err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]); - regs->pr = (unsigned long) frame->retcode; - } - - if (err) - goto give_sigsegv; - - /* Set up registers for signal handler */ - regs->regs[15] = (unsigned long) frame; - regs->regs[4] = signal; /* Arg for signal handler */ - regs->regs[5] = (unsigned long) &frame->info; - regs->regs[6] = (unsigned long) &frame->uc; - regs->pc = (unsigned long) ka->sa.sa_handler; - - set_fs(USER_DS); - -#if DEBUG_SIG - printk("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", - current->comm, current->pid, frame, regs->pc, regs->pr); -#endif - - flush_cache_sigtramp(regs->pr); - if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode)) - flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES); - return; - -give_sigsegv: - force_sigsegv(sig, current); -} - -/* - * OK, we're invoking a handler - */ - -static void -handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, - sigset_t *oldset, struct pt_regs *regs) -{ - /* Are we from a system call? */ - if (regs->tra >= 0) { - /* If so, check system call restarting.. */ - switch (regs->regs[0]) { - case -ERESTARTNOHAND: - regs->regs[0] = -EINTR; - break; - - case -ERESTARTSYS: - if (!(ka->sa.sa_flags & SA_RESTART)) { - regs->regs[0] = -EINTR; - break; - } - /* fallthrough */ - case -ERESTARTNOINTR: - regs->pc -= 2; - } - } else { - /* gUSA handling */ -#ifdef CONFIG_PREEMPT - unsigned long flags; - - local_irq_save(flags); -#endif - if (regs->regs[15] >= 0xc0000000) { - int offset = (int)regs->regs[15]; - - /* Reset stack pointer: clear critical region mark */ - regs->regs[15] = regs->regs[1]; - if (regs->pc < regs->regs[0]) - /* Go to rewind point #1 */ - regs->pc = regs->regs[0] + offset - 2; - } -#ifdef CONFIG_PREEMPT - local_irq_restore(flags); -#endif - } - - /* 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; - - spin_lock_irq(¤t->sighand->siglock); - sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); - if (!(ka->sa.sa_flags & SA_NODEFER)) - sigaddset(¤t->blocked,sig); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); -} - -/* - * 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. - */ -int do_signal(struct pt_regs *regs, sigset_t *oldset) -{ - siginfo_t info; - int signr; - struct k_sigaction ka; - - /* - * We want the common case to go fast, which - * is why we may in certain cases get here from - * kernel mode. Just return without doing anything - * if so. - */ - if (!user_mode(regs)) - return 1; - - if (try_to_freeze()) - goto no_signal; - - if (!oldset) - oldset = ¤t->blocked; - - signr = get_signal_to_deliver(&info, &ka, regs, NULL); - if (signr > 0) { - /* Whee! Actually deliver the signal. */ - handle_signal(signr, &ka, &info, oldset, regs); - return 1; - } - - no_signal: - /* Did we come from a system call? */ - if (regs->tra >= 0) { - /* Restart the system call - no handlers present */ - if (regs->regs[0] == -ERESTARTNOHAND || - regs->regs[0] == -ERESTARTSYS || - regs->regs[0] == -ERESTARTNOINTR || - regs->regs[0] == -ERESTART_RESTARTBLOCK) { - regs->pc -= 2; - } - } - return 0; -} |