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-rw-r--r--arch/arm26/kernel/signal.c538
1 files changed, 0 insertions, 538 deletions
diff --git a/arch/arm26/kernel/signal.c b/arch/arm26/kernel/signal.c
deleted file mode 100644
index 379b82dc645..00000000000
--- a/arch/arm26/kernel/signal.c
+++ /dev/null
@@ -1,538 +0,0 @@
-/*
- * linux/arch/arm26/kernel/signal.c
- *
- * Copyright (C) 1995-2002 Russell King
- * Copyright (C) 2003 Ian Molton (ARM26)
- *
- * FIXME!!! This is probably very broken (13/05/2003)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/signal.h>
-#include <linux/wait.h>
-#include <linux/ptrace.h>
-#include <linux/personality.h>
-#include <linux/tty.h>
-#include <linux/binfmts.h>
-#include <linux/elf.h>
-
-#include <asm/pgalloc.h>
-#include <asm/ucontext.h>
-#include <asm/uaccess.h>
-#include <asm/unistd.h>
-
-#include "ptrace.h"
-
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
-/*
- * For ARM syscalls, we encode the syscall number into the instruction.
- */
-#define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn))
-#define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn))
-
-static int do_signal(sigset_t *oldset, struct pt_regs * regs, int syscall);
-
-/*
- * atomically swap in the new signal mask, and wait for a signal.
- */
-asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask, struct pt_regs *regs)
-{
- sigset_t saveset;
-
- mask &= _BLOCKABLE;
- spin_lock_irq(&current->sighand->siglock);
- saveset = current->blocked;
- siginitset(&current->blocked, mask);
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
- regs->ARM_r0 = -EINTR;
-
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- if (do_signal(&saveset, regs, 0))
- return regs->ARM_r0;
- }
-}
-
-asmlinkage int
-sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, 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(&current->sighand->siglock);
- saveset = current->blocked;
- current->blocked = newset;
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
- regs->ARM_r0 = -EINTR;
-
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- if (do_signal(&saveset, regs, 0))
- return regs->ARM_r0;
- }
-}
-
-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 (!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;
-}
-
-/*
- * Do a signal return; undo the signal stack.
- */
-struct sigframe
-{
- struct sigcontext sc;
- unsigned long extramask[_NSIG_WORDS-1];
- unsigned long retcode;
-};
-
-struct rt_sigframe
-{
- struct siginfo *pinfo;
- void *puc;
- struct siginfo info;
- struct ucontext uc;
- unsigned long retcode;
-};
-
-static int
-restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
-{
- int err = 0;
-
- __get_user_error(regs->ARM_r0, &sc->arm_r0, err);
- __get_user_error(regs->ARM_r1, &sc->arm_r1, err);
- __get_user_error(regs->ARM_r2, &sc->arm_r2, err);
- __get_user_error(regs->ARM_r3, &sc->arm_r3, err);
- __get_user_error(regs->ARM_r4, &sc->arm_r4, err);
- __get_user_error(regs->ARM_r5, &sc->arm_r5, err);
- __get_user_error(regs->ARM_r6, &sc->arm_r6, err);
- __get_user_error(regs->ARM_r7, &sc->arm_r7, err);
- __get_user_error(regs->ARM_r8, &sc->arm_r8, err);
- __get_user_error(regs->ARM_r9, &sc->arm_r9, err);
- __get_user_error(regs->ARM_r10, &sc->arm_r10, err);
- __get_user_error(regs->ARM_fp, &sc->arm_fp, err);
- __get_user_error(regs->ARM_ip, &sc->arm_ip, err);
- __get_user_error(regs->ARM_sp, &sc->arm_sp, err);
- __get_user_error(regs->ARM_lr, &sc->arm_lr, err);
- __get_user_error(regs->ARM_pc, &sc->arm_pc, err);
-
- err |= !valid_user_regs(regs);
-
- return err;
-}
-
-asmlinkage int sys_sigreturn(struct pt_regs *regs)
-{
- struct sigframe *frame;
- sigset_t set;
-
- /*
- * Since we stacked the signal on a 64-bit boundary,
- * then 'sp' should be word aligned here. If it's
- * not, then the user is trying to mess with us.
- */
- if (regs->ARM_sp & 7)
- goto badframe;
-
- frame = (struct sigframe *)regs->ARM_sp;
-
- 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(&current->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
-
- if (restore_sigcontext(regs, &frame->sc))
- goto badframe;
-
- /* Send SIGTRAP if we're single-stepping */
- if (current->ptrace & PT_SINGLESTEP) {
- ptrace_cancel_bpt(current);
- send_sig(SIGTRAP, current, 1);
- }
-
- return regs->ARM_r0;
-
-badframe:
- force_sig(SIGSEGV, current);
- return 0;
-}
-
-asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
-{
- struct rt_sigframe *frame;
- sigset_t set;
-
- /*
- * Since we stacked the signal on a 64-bit boundary,
- * then 'sp' should be word aligned here. If it's
- * not, then the user is trying to mess with us.
- */
- if (regs->ARM_sp & 7)
- goto badframe;
-
- frame = (struct rt_sigframe *)regs->ARM_sp;
-
- 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(&current->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
-
- if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
- goto badframe;
-
- /* Send SIGTRAP if we're single-stepping */
- if (current->ptrace & PT_SINGLESTEP) {
- ptrace_cancel_bpt(current);
- send_sig(SIGTRAP, current, 1);
- }
-
- return regs->ARM_r0;
-
-badframe:
- force_sig(SIGSEGV, current);
- return 0;
-}
-
-static int
-setup_sigcontext(struct sigcontext *sc, /*struct _fpstate *fpstate,*/
- struct pt_regs *regs, unsigned long mask)
-{
- int err = 0;
-
- __put_user_error(regs->ARM_r0, &sc->arm_r0, err);
- __put_user_error(regs->ARM_r1, &sc->arm_r1, err);
- __put_user_error(regs->ARM_r2, &sc->arm_r2, err);
- __put_user_error(regs->ARM_r3, &sc->arm_r3, err);
- __put_user_error(regs->ARM_r4, &sc->arm_r4, err);
- __put_user_error(regs->ARM_r5, &sc->arm_r5, err);
- __put_user_error(regs->ARM_r6, &sc->arm_r6, err);
- __put_user_error(regs->ARM_r7, &sc->arm_r7, err);
- __put_user_error(regs->ARM_r8, &sc->arm_r8, err);
- __put_user_error(regs->ARM_r9, &sc->arm_r9, err);
- __put_user_error(regs->ARM_r10, &sc->arm_r10, err);
- __put_user_error(regs->ARM_fp, &sc->arm_fp, err);
- __put_user_error(regs->ARM_ip, &sc->arm_ip, err);
- __put_user_error(regs->ARM_sp, &sc->arm_sp, err);
- __put_user_error(regs->ARM_lr, &sc->arm_lr, err);
- __put_user_error(regs->ARM_pc, &sc->arm_pc, err);
-
- __put_user_error(current->thread.trap_no, &sc->trap_no, err);
- __put_user_error(current->thread.error_code, &sc->error_code, err);
- __put_user_error(current->thread.address, &sc->fault_address, err);
- __put_user_error(mask, &sc->oldmask, err);
-
- return err;
-}
-
-static inline void *
-get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize)
-{
- unsigned long sp = regs->ARM_sp;
-
- /*
- * This is the X/Open sanctioned signal stack switching.
- */
- if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
- sp = current->sas_ss_sp + current->sas_ss_size;
-
- /*
- * ATPCS B01 mandates 8-byte alignment
- */
- return (void *)((sp - framesize) & ~7);
-}
-
-static int
-setup_return(struct pt_regs *regs, struct k_sigaction *ka,
- unsigned long *rc, void *frame, int usig)
-{
- unsigned long handler = (unsigned long)ka->sa.sa_handler;
- unsigned long retcode;
-
- if (ka->sa.sa_flags & SA_RESTORER) {
- retcode = (unsigned long)ka->sa.sa_restorer;
- } else {
-
- if (__put_user((ka->sa.sa_flags & SA_SIGINFO)?SWI_SYS_RT_SIGRETURN:SWI_SYS_SIGRETURN, rc))
- return 1;
-
- retcode = ((unsigned long)rc);
- }
-
- regs->ARM_r0 = usig;
- regs->ARM_sp = (unsigned long)frame;
- regs->ARM_lr = retcode;
- regs->ARM_pc = handler & ~3;
-
- return 0;
-}
-
-static int
-setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs)
-{
- struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
- int err = 0;
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
- return 1;
-
- err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
-
- if (_NSIG_WORDS > 1) {
- err |= __copy_to_user(frame->extramask, &set->sig[1],
- sizeof(frame->extramask));
- }
-
- if (err == 0)
- err = setup_return(regs, ka, &frame->retcode, frame, usig);
-
- return err;
-}
-
-static int
-setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
-{
- struct rt_sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
- int err = 0;
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
- return 1;
-
- __put_user_error(&frame->info, &frame->pinfo, err);
- __put_user_error(&frame->uc, &frame->puc, err);
- err |= copy_siginfo_to_user(&frame->info, info);
-
- /* Clear all the bits of the ucontext we don't use. */
- err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
-
- err |= setup_sigcontext(&frame->uc.uc_mcontext, /*&frame->fpstate,*/
- regs, set->sig[0]);
- err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-
- if (err == 0)
- err = setup_return(regs, ka, &frame->retcode, frame, usig);
-
- if (err == 0) {
- /*
- * For realtime signals we must also set the second and third
- * arguments for the signal handler.
- * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
- */
- regs->ARM_r1 = (unsigned long)frame->pinfo;
- regs->ARM_r2 = (unsigned long)frame->puc;
- }
-
- return err;
-}
-
-static inline void restart_syscall(struct pt_regs *regs)
-{
- regs->ARM_r0 = regs->ARM_ORIG_r0;
- regs->ARM_pc -= 4;
-}
-
-/*
- * OK, we're invoking a handler
- */
-static void
-handle_signal(unsigned long sig, siginfo_t *info, sigset_t *oldset,
- struct pt_regs * regs, int syscall)
-{
- struct thread_info *thread = current_thread_info();
- struct task_struct *tsk = current;
- struct k_sigaction *ka = &tsk->sighand->action[sig-1];
- int usig = sig;
- int ret;
-
- /*
- * If we were from a system call, check for system call restarting...
- */
- if (syscall) {
- switch (regs->ARM_r0) {
- case -ERESTART_RESTARTBLOCK:
- current_thread_info()->restart_block.fn =
- do_no_restart_syscall;
- case -ERESTARTNOHAND:
- regs->ARM_r0 = -EINTR;
- break;
- case -ERESTARTSYS:
- if (!(ka->sa.sa_flags & SA_RESTART)) {
- regs->ARM_r0 = -EINTR;
- break;
- }
- /* fallthrough */
- case -ERESTARTNOINTR:
- restart_syscall(regs);
- }
- }
-
- /*
- * translate the signal
- */
- if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap)
- usig = thread->exec_domain->signal_invmap[usig];
-
- /*
- * Set up the stack frame
- */
- if (ka->sa.sa_flags & SA_SIGINFO)
- ret = setup_rt_frame(usig, ka, info, oldset, regs);
- else
- ret = setup_frame(usig, ka, oldset, regs);
-
- /*
- * Check that the resulting registers are actually sane.
- */
- ret |= !valid_user_regs(regs);
-
- if (ret == 0) {
- if (ka->sa.sa_flags & SA_ONESHOT)
- ka->sa.sa_handler = SIG_DFL;
-
- spin_lock_irq(&tsk->sighand->siglock);
- sigorsets(&tsk->blocked, &tsk->blocked,
- &ka->sa.sa_mask);
- if (!(ka->sa.sa_flags & SA_NODEFER))
- sigaddset(&tsk->blocked, sig);
- recalc_sigpending();
- spin_unlock_irq(&tsk->sighand->siglock);
- return;
- }
-
- force_sigsegv(sig, tsk);
-}
-
-/*
- * 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.
- */
-static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
-{
- 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 0;
-
- if (current->ptrace & PT_SINGLESTEP)
- ptrace_cancel_bpt(current);
-
- signr = get_signal_to_deliver(&info, &ka, regs, NULL);
- if (signr > 0) {
- handle_signal(signr, &info, oldset, regs, syscall);
- if (current->ptrace & PT_SINGLESTEP)
- ptrace_set_bpt(current);
- return 1;
- }
-
- /*
- * No signal to deliver to the process - restart the syscall.
- */
- if (syscall) {
- if (regs->ARM_r0 == -ERESTART_RESTARTBLOCK) {
- u32 *usp;
-
- regs->ARM_sp -= 12;
- usp = (u32 *)regs->ARM_sp;
-
- put_user(regs->ARM_pc, &usp[0]);
- /* swi __NR_restart_syscall */
- put_user(0xef000000 | __NR_restart_syscall, &usp[1]);
- /* ldr pc, [sp], #12 */
-// FIXME!!! is #12 correct there?
- put_user(0xe49df00c, &usp[2]);
-
- regs->ARM_pc = regs->ARM_sp + 4;
- }
- if (regs->ARM_r0 == -ERESTARTNOHAND ||
- regs->ARM_r0 == -ERESTARTSYS ||
- regs->ARM_r0 == -ERESTARTNOINTR) {
- restart_syscall(regs);
- }
- }
- if (current->ptrace & PT_SINGLESTEP)
- ptrace_set_bpt(current);
- return 0;
-}
-
-asmlinkage void
-do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall)
-{
- if (thread_flags & _TIF_SIGPENDING)
- do_signal(&current->blocked, regs, syscall);
-}
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