diff options
Diffstat (limited to 'arch/mn10300/kernel/signal.c')
| -rw-r--r-- | arch/mn10300/kernel/signal.c | 431 |
1 files changed, 0 insertions, 431 deletions
diff --git a/arch/mn10300/kernel/signal.c b/arch/mn10300/kernel/signal.c deleted file mode 100644 index 2f3cb5734235..000000000000 --- a/arch/mn10300/kernel/signal.c +++ /dev/null @@ -1,431 +0,0 @@ -/* MN10300 Signal handling - * - * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. - * Written by David Howells (dhowells@redhat.com) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public Licence - * as published by the Free Software Foundation; either version - * 2 of the Licence, or (at your option) any later version. - */ - -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/smp.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/suspend.h> -#include <linux/tracehook.h> -#include <asm/cacheflush.h> -#include <asm/ucontext.h> -#include <linux/uaccess.h> -#include <asm/fpu.h> -#include "sigframe.h" - -#define DEBUG_SIG 0 - -/* - * do a signal return; undo the signal stack. - */ -static int restore_sigcontext(struct pt_regs *regs, - struct sigcontext __user *sc, long *_d0) -{ - unsigned int err = 0; - - /* Always make any pending restarted system calls return -EINTR */ - current->restart_block.fn = do_no_restart_syscall; - - if (is_using_fpu(current)) - fpu_kill_state(current); - -#define COPY(x) err |= __get_user(regs->x, &sc->x) - COPY(d1); COPY(d2); COPY(d3); - COPY(a0); COPY(a1); COPY(a2); COPY(a3); - COPY(e0); COPY(e1); COPY(e2); COPY(e3); - COPY(e4); COPY(e5); COPY(e6); COPY(e7); - COPY(lar); COPY(lir); - COPY(mdr); COPY(mdrq); - COPY(mcvf); COPY(mcrl); COPY(mcrh); - COPY(sp); COPY(pc); -#undef COPY - - { - unsigned int tmpflags; -#ifndef CONFIG_MN10300_USING_JTAG -#define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \ - EPSW_T | EPSW_nAR) -#else -#define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \ - EPSW_nAR) -#endif - err |= __get_user(tmpflags, &sc->epsw); - regs->epsw = (regs->epsw & ~USER_EPSW) | - (tmpflags & USER_EPSW); - regs->orig_d0 = -1; /* disable syscall checks */ - } - - { - struct fpucontext *buf; - err |= __get_user(buf, &sc->fpucontext); - if (buf) { - if (!access_ok(VERIFY_READ, buf, sizeof(*buf))) - goto badframe; - err |= fpu_restore_sigcontext(buf); - } - } - - err |= __get_user(*_d0, &sc->d0); - return err; - -badframe: - return 1; -} - -/* - * standard signal return syscall - */ -asmlinkage long sys_sigreturn(void) -{ - struct sigframe __user *frame; - sigset_t set; - long d0; - - frame = (struct sigframe __user *) current_frame()->sp; - if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; - if (__get_user(set.sig[0], &frame->sc.oldmask)) - goto badframe; - - if (_NSIG_WORDS > 1 && - __copy_from_user(&set.sig[1], &frame->extramask, - sizeof(frame->extramask))) - goto badframe; - - set_current_blocked(&set); - - if (restore_sigcontext(current_frame(), &frame->sc, &d0)) - goto badframe; - - return d0; - -badframe: - force_sig(SIGSEGV, current); - return 0; -} - -/* - * realtime signal return syscall - */ -asmlinkage long sys_rt_sigreturn(void) -{ - struct rt_sigframe __user *frame; - sigset_t set; - long d0; - - frame = (struct rt_sigframe __user *) current_frame()->sp; - if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; - if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) - goto badframe; - - set_current_blocked(&set); - - if (restore_sigcontext(current_frame(), &frame->uc.uc_mcontext, &d0)) - goto badframe; - - if (restore_altstack(&frame->uc.uc_stack)) - goto badframe; - - return d0; - -badframe: - force_sig(SIGSEGV, current); - return 0; -} - -/* - * store the userspace context into a signal frame - */ -static int setup_sigcontext(struct sigcontext __user *sc, - struct fpucontext *fpuctx, - struct pt_regs *regs, - unsigned long mask) -{ - int tmp, err = 0; - -#define COPY(x) err |= __put_user(regs->x, &sc->x) - COPY(d0); COPY(d1); COPY(d2); COPY(d3); - COPY(a0); COPY(a1); COPY(a2); COPY(a3); - COPY(e0); COPY(e1); COPY(e2); COPY(e3); - COPY(e4); COPY(e5); COPY(e6); COPY(e7); - COPY(lar); COPY(lir); - COPY(mdr); COPY(mdrq); - COPY(mcvf); COPY(mcrl); COPY(mcrh); - COPY(sp); COPY(epsw); COPY(pc); -#undef COPY - - tmp = fpu_setup_sigcontext(fpuctx); - if (tmp < 0) - err = 1; - else - err |= __put_user(tmp ? fpuctx : NULL, &sc->fpucontext); - - /* non-iBCS2 extensions.. */ - err |= __put_user(mask, &sc->oldmask); - - return err; -} - -/* - * determine which stack to use.. - */ -static inline void __user *get_sigframe(struct ksignal *ksig, - struct pt_regs *regs, - size_t frame_size) -{ - unsigned long sp = sigsp(regs->sp, ksig); - - return (void __user *) ((sp - frame_size) & ~7UL); -} - -/* - * set up a normal signal frame - */ -static int setup_frame(struct ksignal *ksig, sigset_t *set, - struct pt_regs *regs) -{ - struct sigframe __user *frame; - int sig = ksig->sig; - - frame = get_sigframe(ksig, regs, sizeof(*frame)); - - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - return -EFAULT; - - if (__put_user(sig, &frame->sig) < 0 || - __put_user(&frame->sc, &frame->psc) < 0) - return -EFAULT; - - if (setup_sigcontext(&frame->sc, &frame->fpuctx, regs, set->sig[0])) - return -EFAULT; - - if (_NSIG_WORDS > 1) { - if (__copy_to_user(frame->extramask, &set->sig[1], - sizeof(frame->extramask))) - return -EFAULT; - } - - /* set up to return from userspace. If provided, use a stub already in - * userspace */ - if (ksig->ka.sa.sa_flags & SA_RESTORER) { - if (__put_user(ksig->ka.sa.sa_restorer, &frame->pretcode)) - return -EFAULT; - } else { - if (__put_user((void (*)(void))frame->retcode, - &frame->pretcode)) - return -EFAULT; - /* this is mov $,d0; syscall 0 */ - if (__put_user(0x2c, (char *)(frame->retcode + 0)) || - __put_user(__NR_sigreturn, (char *)(frame->retcode + 1)) || - __put_user(0x00, (char *)(frame->retcode + 2)) || - __put_user(0xf0, (char *)(frame->retcode + 3)) || - __put_user(0xe0, (char *)(frame->retcode + 4))) - return -EFAULT; - flush_icache_range((unsigned long) frame->retcode, - (unsigned long) frame->retcode + 5); - } - - /* set up registers for signal handler */ - regs->sp = (unsigned long) frame; - regs->pc = (unsigned long) ksig->ka.sa.sa_handler; - regs->d0 = sig; - regs->d1 = (unsigned long) &frame->sc; - -#if DEBUG_SIG - printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n", - sig, current->comm, current->pid, frame, regs->pc, - frame->pretcode); -#endif - - return 0; -} - -/* - * set up a realtime signal frame - */ -static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, - struct pt_regs *regs) -{ - struct rt_sigframe __user *frame; - int sig = ksig->sig; - - frame = get_sigframe(ksig, regs, sizeof(*frame)); - - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - return -EFAULT; - - if (__put_user(sig, &frame->sig) || - __put_user(&frame->info, &frame->pinfo) || - __put_user(&frame->uc, &frame->puc) || - copy_siginfo_to_user(&frame->info, &ksig->info)) - return -EFAULT; - - /* create the ucontext. */ - if (__put_user(0, &frame->uc.uc_flags) || - __put_user(0, &frame->uc.uc_link) || - __save_altstack(&frame->uc.uc_stack, regs->sp) || - setup_sigcontext(&frame->uc.uc_mcontext, - &frame->fpuctx, regs, set->sig[0]) || - __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set))) - return -EFAULT; - - /* set up to return from userspace. If provided, use a stub already in - * userspace */ - if (ksig->ka.sa.sa_flags & SA_RESTORER) { - if (__put_user(ksig->ka.sa.sa_restorer, &frame->pretcode)) - return -EFAULT; - - } else { - if (__put_user((void(*)(void))frame->retcode, - &frame->pretcode) || - /* This is mov $,d0; syscall 0 */ - __put_user(0x2c, (char *)(frame->retcode + 0)) || - __put_user(__NR_rt_sigreturn, - (char *)(frame->retcode + 1)) || - __put_user(0x00, (char *)(frame->retcode + 2)) || - __put_user(0xf0, (char *)(frame->retcode + 3)) || - __put_user(0xe0, (char *)(frame->retcode + 4))) - return -EFAULT; - - flush_icache_range((u_long) frame->retcode, - (u_long) frame->retcode + 5); - } - - /* Set up registers for signal handler */ - regs->sp = (unsigned long) frame; - regs->pc = (unsigned long) ksig->ka.sa.sa_handler; - regs->d0 = sig; - regs->d1 = (long) &frame->info; - -#if DEBUG_SIG - printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n", - sig, current->comm, current->pid, frame, regs->pc, - frame->pretcode); -#endif - - return 0; -} - -static inline void stepback(struct pt_regs *regs) -{ - regs->pc -= 2; - regs->orig_d0 = -1; -} - -/* - * handle the actual delivery of a signal to userspace - */ -static int handle_signal(struct ksignal *ksig, struct pt_regs *regs) -{ - sigset_t *oldset = sigmask_to_save(); - int ret; - - /* Are we from a system call? */ - if (regs->orig_d0 >= 0) { - /* If so, check system call restarting.. */ - switch (regs->d0) { - case -ERESTART_RESTARTBLOCK: - case -ERESTARTNOHAND: - regs->d0 = -EINTR; - break; - - case -ERESTARTSYS: - if (!(ksig->ka.sa.sa_flags & SA_RESTART)) { - regs->d0 = -EINTR; - break; - } - - /* fallthrough */ - case -ERESTARTNOINTR: - regs->d0 = regs->orig_d0; - stepback(regs); - } - } - - /* Set up the stack frame */ - if (ksig->ka.sa.sa_flags & SA_SIGINFO) - ret = setup_rt_frame(ksig, oldset, regs); - else - ret = setup_frame(ksig, oldset, regs); - - signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP)); - return 0; -} - -/* - * handle a potential signal - */ -static void do_signal(struct pt_regs *regs) -{ - struct ksignal ksig; - - if (get_signal(&ksig)) { - handle_signal(&ksig, regs); - return; - } - - /* did we come from a system call? */ - if (regs->orig_d0 >= 0) { - /* restart the system call - no handlers present */ - switch (regs->d0) { - case -ERESTARTNOHAND: - case -ERESTARTSYS: - case -ERESTARTNOINTR: - regs->d0 = regs->orig_d0; - stepback(regs); - break; - - case -ERESTART_RESTARTBLOCK: - regs->d0 = __NR_restart_syscall; - stepback(regs); - break; - } - } - - /* if there's no signal to deliver, we just put the saved sigmask - * back */ - restore_saved_sigmask(); -} - -/* - * notification of userspace execution resumption - * - triggered by current->work.notify_resume - */ -asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags) -{ - /* Pending single-step? */ - if (thread_info_flags & _TIF_SINGLESTEP) { -#ifndef CONFIG_MN10300_USING_JTAG - regs->epsw |= EPSW_T; - clear_thread_flag(TIF_SINGLESTEP); -#else - BUG(); /* no h/w single-step if using JTAG unit */ -#endif - } - - /* deal with pending signal delivery */ - if (thread_info_flags & _TIF_SIGPENDING) - do_signal(regs); - - if (thread_info_flags & _TIF_NOTIFY_RESUME) { - clear_thread_flag(TIF_NOTIFY_RESUME); - tracehook_notify_resume(current_frame()); - } -} |