diff options
Diffstat (limited to 'arch/frv/kernel/signal.c')
| -rw-r--r-- | arch/frv/kernel/signal.c | 426 |
1 files changed, 0 insertions, 426 deletions
diff --git a/arch/frv/kernel/signal.c b/arch/frv/kernel/signal.c deleted file mode 100644 index bf6e07a7a1b1c..0000000000000 --- a/arch/frv/kernel/signal.c +++ /dev/null @@ -1,426 +0,0 @@ -/* signal.c: FRV specific bits of signal handling - * - * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved. - * Written by David Howells (dhowells@redhat.com) - * - Derived from arch/m68k/kernel/signal.c - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, 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/personality.h> -#include <linux/tracehook.h> -#include <asm/ucontext.h> -#include <linux/uaccess.h> -#include <asm/cacheflush.h> - -#define DEBUG_SIG 0 - -struct fdpic_func_descriptor { - unsigned long text; - unsigned long GOT; -}; - -/* - * Do a signal return; undo the signal stack. - */ - -struct sigframe -{ - __sigrestore_t pretcode; - int sig; - struct sigcontext sc; - unsigned long extramask[_NSIG_WORDS-1]; - uint32_t retcode[2]; -}; - -struct rt_sigframe -{ - __sigrestore_t pretcode; - int sig; - struct siginfo __user *pinfo; - void __user *puc; - struct siginfo info; - struct ucontext uc; - uint32_t retcode[2]; -}; - -static int restore_sigcontext(struct sigcontext __user *sc, int *_gr8) -{ - struct user_context *user = current->thread.user; - unsigned long tbr, psr; - - /* Always make any pending restarted system calls return -EINTR */ - current->restart_block.fn = do_no_restart_syscall; - - tbr = user->i.tbr; - psr = user->i.psr; - if (copy_from_user(user, &sc->sc_context, sizeof(sc->sc_context))) - goto badframe; - user->i.tbr = tbr; - user->i.psr = psr; - - restore_user_regs(user); - - user->i.syscallno = -1; /* disable syscall checks */ - - *_gr8 = user->i.gr[8]; - return 0; - - badframe: - return 1; -} - -asmlinkage int sys_sigreturn(void) -{ - struct sigframe __user *frame = (struct sigframe __user *) __frame->sp; - sigset_t set; - int gr8; - - if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; - if (__get_user(set.sig[0], &frame->sc.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(&frame->sc, &gr8)) - goto badframe; - return gr8; - - badframe: - force_sig(SIGSEGV, current); - return 0; -} - -asmlinkage int sys_rt_sigreturn(void) -{ - struct rt_sigframe __user *frame = (struct rt_sigframe __user *) __frame->sp; - sigset_t set; - int gr8; - - 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(&frame->uc.uc_mcontext, &gr8)) - goto badframe; - - if (restore_altstack(&frame->uc.uc_stack)) - goto badframe; - - return gr8; - -badframe: - force_sig(SIGSEGV, current); - return 0; -} - -/* - * Set up a signal frame - */ -static int setup_sigcontext(struct sigcontext __user *sc, unsigned long mask) -{ - save_user_regs(current->thread.user); - - if (copy_to_user(&sc->sc_context, current->thread.user, sizeof(sc->sc_context)) != 0) - goto badframe; - - /* non-iBCS2 extensions.. */ - if (__put_user(mask, &sc->sc_oldmask) < 0) - goto badframe; - - return 0; - - badframe: - return 1; -} - -/*****************************************************************************/ -/* - * Determine which stack to use.. - */ -static inline void __user *get_sigframe(struct ksignal *ksig, - size_t frame_size) -{ - unsigned long sp = sigsp(__frame->sp, ksig); - - return (void __user *) ((sp - frame_size) & ~7UL); - -} /* end get_sigframe() */ - -/*****************************************************************************/ -/* - * - */ -static int setup_frame(struct ksignal *ksig, sigset_t *set) -{ - struct sigframe __user *frame; - int sig = ksig->sig; - - frame = get_sigframe(ksig, sizeof(*frame)); - - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - return -EFAULT; - - if (__put_user(sig, &frame->sig) < 0) - return -EFAULT; - - if (setup_sigcontext(&frame->sc, 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) < 0) - return -EFAULT; - } - else { - /* Set up the following code on the stack: - * setlos #__NR_sigreturn,gr7 - * tira gr0,0 - */ - if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) || - __put_user(0x8efc0000|__NR_sigreturn, &frame->retcode[0]) || - __put_user(0xc0700000, &frame->retcode[1])) - return -EFAULT; - - flush_icache_range((unsigned long) frame->retcode, - (unsigned long) (frame->retcode + 2)); - } - - /* Set up registers for the signal handler */ - if (current->personality & FDPIC_FUNCPTRS) { - struct fdpic_func_descriptor __user *funcptr = - (struct fdpic_func_descriptor __user *) ksig->ka.sa.sa_handler; - struct fdpic_func_descriptor desc; - if (copy_from_user(&desc, funcptr, sizeof(desc))) - return -EFAULT; - __frame->pc = desc.text; - __frame->gr15 = desc.GOT; - } else { - __frame->pc = (unsigned long) ksig->ka.sa.sa_handler; - __frame->gr15 = 0; - } - - __frame->sp = (unsigned long) frame; - __frame->lr = (unsigned long) &frame->retcode; - __frame->gr8 = sig; - -#if DEBUG_SIG - printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n", - sig, current->comm, current->pid, frame, __frame->pc, - frame->pretcode); -#endif - - return 0; -} /* end setup_frame() */ - -/*****************************************************************************/ -/* - * - */ -static int setup_rt_frame(struct ksignal *ksig, sigset_t *set) -{ - struct rt_sigframe __user *frame; - int sig = ksig->sig; - - frame = get_sigframe(ksig, 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)) - return -EFAULT; - - if (copy_siginfo_to_user(&frame->info, &ksig->info)) - return -EFAULT; - - /* Create the ucontext. */ - if (__put_user(0, &frame->uc.uc_flags) || - __put_user(NULL, &frame->uc.uc_link) || - __save_altstack(&frame->uc.uc_stack, __frame->sp)) - return -EFAULT; - - if (setup_sigcontext(&frame->uc.uc_mcontext, set->sig[0])) - return -EFAULT; - - if (__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 { - /* Set up the following code on the stack: - * setlos #__NR_sigreturn,gr7 - * tira gr0,0 - */ - if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) || - __put_user(0x8efc0000|__NR_rt_sigreturn, &frame->retcode[0]) || - __put_user(0xc0700000, &frame->retcode[1])) - return -EFAULT; - - flush_icache_range((unsigned long) frame->retcode, - (unsigned long) (frame->retcode + 2)); - } - - /* Set up registers for signal handler */ - if (current->personality & FDPIC_FUNCPTRS) { - struct fdpic_func_descriptor __user *funcptr = - (struct fdpic_func_descriptor __user *) ksig->ka.sa.sa_handler; - struct fdpic_func_descriptor desc; - if (copy_from_user(&desc, funcptr, sizeof(desc))) - return -EFAULT; - __frame->pc = desc.text; - __frame->gr15 = desc.GOT; - } else { - __frame->pc = (unsigned long) ksig->ka.sa.sa_handler; - __frame->gr15 = 0; - } - - __frame->sp = (unsigned long) frame; - __frame->lr = (unsigned long) &frame->retcode; - __frame->gr8 = sig; - __frame->gr9 = (unsigned long) &frame->info; - -#if DEBUG_SIG - printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n", - sig, current->comm, current->pid, frame, __frame->pc, - frame->pretcode); -#endif - return 0; - -} /* end setup_rt_frame() */ - -/*****************************************************************************/ -/* - * OK, we're invoking a handler - */ -static void handle_signal(struct ksignal *ksig) -{ - sigset_t *oldset = sigmask_to_save(); - int ret; - - /* Are we from a system call? */ - if (__frame->syscallno != -1) { - /* If so, check system call restarting.. */ - switch (__frame->gr8) { - case -ERESTART_RESTARTBLOCK: - case -ERESTARTNOHAND: - __frame->gr8 = -EINTR; - break; - - case -ERESTARTSYS: - if (!(ksig->ka.sa.sa_flags & SA_RESTART)) { - __frame->gr8 = -EINTR; - break; - } - - /* fallthrough */ - case -ERESTARTNOINTR: - __frame->gr8 = __frame->orig_gr8; - __frame->pc -= 4; - } - __frame->syscallno = -1; - } - - /* Set up the stack frame */ - if (ksig->ka.sa.sa_flags & SA_SIGINFO) - ret = setup_rt_frame(ksig, oldset); - else - ret = setup_frame(ksig, oldset); - - signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP)); -} /* end handle_signal() */ - -/*****************************************************************************/ -/* - * 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. - */ -static void do_signal(void) -{ - struct ksignal ksig; - - if (get_signal(&ksig)) { - handle_signal(&ksig); - return; - } - - /* Did we come from a system call? */ - if (__frame->syscallno != -1) { - /* Restart the system call - no handlers present */ - switch (__frame->gr8) { - case -ERESTARTNOHAND: - case -ERESTARTSYS: - case -ERESTARTNOINTR: - __frame->gr8 = __frame->orig_gr8; - __frame->pc -= 4; - break; - - case -ERESTART_RESTARTBLOCK: - __frame->gr7 = __NR_restart_syscall; - __frame->pc -= 4; - break; - } - __frame->syscallno = -1; - } - - /* if there's no signal to deliver, we just put the saved sigmask - * back */ - restore_saved_sigmask(); -} /* end do_signal() */ - -/*****************************************************************************/ -/* - * notification of userspace execution resumption - * - triggered by the TIF_WORK_MASK flags - */ -asmlinkage void do_notify_resume(__u32 thread_info_flags) -{ - /* pending single-step? */ - if (thread_info_flags & _TIF_SINGLESTEP) - clear_thread_flag(TIF_SINGLESTEP); - - /* deal with pending signal delivery */ - if (thread_info_flags & _TIF_SIGPENDING) - do_signal(); - - /* deal with notification on about to resume userspace execution */ - if (thread_info_flags & _TIF_NOTIFY_RESUME) { - clear_thread_flag(TIF_NOTIFY_RESUME); - tracehook_notify_resume(__frame); - } - -} /* end do_notify_resume() */ |