/*
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/*
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* linux/arch/ppc/kernel/signal.c
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* linux/arch/ppc/kernel/signal.c
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*
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Adapted for PowerPC by Gary Thomas
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* Adapted for PowerPC by Gary Thomas
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*/
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*/
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#include <linux/config.h>
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <linux/ptrace.h>
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#include <linux/unistd.h>
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#include <linux/unistd.h>
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#include <asm/segment.h>
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#include <asm/segment.h>
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#include <asm/pgtable.h>
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#include <asm/pgtable.h>
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#include <asm/traps.h>
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#include <asm/traps.h>
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/*
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/*
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#define DEBUG
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#define DEBUG
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*/
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*/
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#define offsetof(type, member) ((size_t)(&((type *)0)->member))
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#define offsetof(type, member) ((size_t)(&((type *)0)->member))
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#define _S(nr) (1<<((nr)-1))
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#define _S(nr) (1<<((nr)-1))
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#define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
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#define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
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asmlinkage int sys_waitpid(pid_t pid,unsigned long * stat_addr, int options);
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asmlinkage int sys_waitpid(pid_t pid,unsigned long * stat_addr, int options);
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asmlinkage int do_signal(unsigned long oldmask, struct pt_regs *regs);
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asmlinkage int do_signal(unsigned long oldmask, struct pt_regs *regs);
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/*
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/*
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* atomically swap in the new signal mask, and wait for a signal.
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* atomically swap in the new signal mask, and wait for a signal.
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*/
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*/
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asmlinkage int sys_sigsuspend(unsigned long set, int p2, int p3, int p4, int p6, int p7, struct pt_regs *regs)
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asmlinkage int sys_sigsuspend(unsigned long set, int p2, int p3, int p4, int p6, int p7, struct pt_regs *regs)
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{
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{
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unsigned long mask;
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unsigned long mask;
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mask = current->blocked;
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mask = current->blocked;
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current->blocked = set & _BLOCKABLE;
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current->blocked = set & _BLOCKABLE;
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regs->gprs[1] = -EINTR;
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regs->gprs[1] = -EINTR;
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#if 0
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#if 0
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printk("Task: %x[%d] - SIGSUSPEND at %x, Mask: %x\n", current, current->pid, regs->nip,
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printk("Task: %x[%d] - SIGSUSPEND at %x, Mask: %x\n", current, current->pid, regs->nip,
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set);
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set);
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#endif
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#endif
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while (1) {
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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schedule();
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if (do_signal(mask,regs))
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if (do_signal(mask,regs))
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return -EINTR;
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return -EINTR;
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}
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}
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}
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}
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/*
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/*
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* This sets regs->esp even though we don't actually use sigstacks yet..
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* This sets regs->esp even though we don't actually use sigstacks yet..
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*/
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*/
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asmlinkage int sys_sigreturn(struct pt_regs *regs)
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asmlinkage int sys_sigreturn(struct pt_regs *regs)
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{
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{
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struct sigcontext_struct *sc;
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struct sigcontext_struct *sc;
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struct pt_regs *int_regs;
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struct pt_regs *int_regs;
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int signo;
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int signo;
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sc = (struct sigcontext_struct *)regs->sp;
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sc = (struct sigcontext_struct *)regs->sp;
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current->blocked = sc->oldmask & _BLOCKABLE;
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current->blocked = sc->oldmask & _BLOCKABLE;
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int_regs = sc->regs;
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int_regs = sc->regs;
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signo = sc->signal;
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signo = sc->signal;
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sc++; /* Pop signal 'context' */
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sc++; /* Pop signal 'context' */
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if (sc == (struct sigcontext_struct *)(int_regs))
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if (sc == (struct sigcontext_struct *)(int_regs))
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{ /* Last stacked signal */
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{ /* Last stacked signal */
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int i;
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int i;
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#if 1
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#if 1
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memcpy(regs, int_regs, sizeof(*regs));
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memcpy(regs, int_regs, sizeof(*regs));
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#else
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#else
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/* Don't mess up 'my' stack frame */
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/* Don't mess up 'my' stack frame */
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for(i = 0; i < 30; i++)
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for(i = 0; i < 30; i++)
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if(i != 7)
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if(i != 7)
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regs->gprs[i] = int_regs->gprs[i];
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regs->gprs[i] = int_regs->gprs[i];
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regs->sp = int_regs->sp;
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regs->sp = int_regs->sp;
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#endif
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#endif
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if ((int)regs->orig_gpr3 >= 0 &&
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if ((int)regs->orig_gpr3 >= 0 &&
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((int)regs->result == -ERESTARTNOHAND ||
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((int)regs->result == -ERESTARTNOHAND ||
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(int)regs->result == -ERESTARTSYS ||
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(int)regs->result == -ERESTARTSYS ||
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(int)regs->result == -ERESTARTNOINTR))
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(int)regs->result == -ERESTARTNOINTR))
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{
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{
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regs->gprs[1] = regs->orig_gpr3;
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regs->gprs[1] = regs->orig_gpr3;
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regs->pc -= 8; /* Back up & retry system call */
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regs->pc -= 8; /* Back up & retry system call */
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regs->result = 0;
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regs->result = 0;
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}
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}
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return (regs->result);
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return (regs->result);
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} else
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} else
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{ /* More signals to go */
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{ /* More signals to go */
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regs->sp = (unsigned long)sc;
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regs->sp = (unsigned long)sc;
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regs->gprs[1] = sc->signal; /* r3 */
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regs->gprs[1] = sc->signal; /* r3 */
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regs->gprs[2] = (unsigned long)sc->regs; /* r4 */
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regs->gprs[2] = (unsigned long)sc->regs; /* r4 */
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regs->gprs[7] = (unsigned long)((sc->regs)+1); /* r9 - link register */
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regs->gprs[7] = (unsigned long)((sc->regs)+1); /* r9 - link register */
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regs->pc = sc->handler;
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regs->pc = sc->handler;
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return (sc->signal);
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return (sc->signal);
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}
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}
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}
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}
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/*
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/*
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* Note that 'init' is a special process: it doesn't get signals it doesn't
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* Note that 'init' is a special process: it doesn't get signals it doesn't
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* want to handle. Thus you cannot kill init even with a SIGKILL even by
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* want to handle. Thus you cannot kill init even with a SIGKILL even by
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* mistake.
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* mistake.
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*
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*
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* Note that we go through the signals twice: once to check the signals that
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* Note that we go through the signals twice: once to check the signals that
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* the kernel can handle, and then we build all the user-level signal handling
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* the kernel can handle, and then we build all the user-level signal handling
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* stack-frames in one go after that.
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* stack-frames in one go after that.
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*/
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*/
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asmlinkage int do_signal(unsigned long oldmask, struct pt_regs * regs)
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asmlinkage int do_signal(unsigned long oldmask, struct pt_regs * regs)
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{
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{
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unsigned long mask = ~current->blocked;
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unsigned long mask = ~current->blocked;
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unsigned long handler_signal = 0;
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unsigned long handler_signal = 0;
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unsigned long *frame = NULL;
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unsigned long *frame = NULL;
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unsigned long *trampoline;
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unsigned long *trampoline;
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unsigned long *regs_ptr;
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unsigned long *regs_ptr;
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unsigned long nip = 0;
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unsigned long nip = 0;
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unsigned long signr;
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unsigned long signr;
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int bitno;
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int bitno;
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struct sigcontext_struct *sc;
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struct sigcontext_struct *sc;
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struct sigaction * sa;
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struct sigaction * sa;
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unsigned long flags;
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unsigned long flags;
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save_flags(flags);
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save_flags(flags);
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cli();
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cli();
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while ((signr = current->signal & mask)) {
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while ((signr = current->signal & mask)) {
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#if 0
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#if 0
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signr = ffz(~signr); /* Compute bit # */
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signr = ffz(~signr); /* Compute bit # */
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#else
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#else
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for (bitno = 0; bitno < 32; bitno++)
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for (bitno = 0; bitno < 32; bitno++)
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{
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{
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if (signr & (1<<bitno)) break;
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if (signr & (1<<bitno)) break;
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}
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}
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signr = bitno;
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signr = bitno;
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#endif
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#endif
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current->signal &= ~(1<<signr); /* Clear bit */
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current->signal &= ~(1<<signr); /* Clear bit */
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sa = current->sig->action + signr;
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sa = current->sig->action + signr;
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signr++;
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signr++;
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if ((current->flags & PF_PTRACED) && signr != SIGKILL) {
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if ((current->flags & PF_PTRACED) && signr != SIGKILL) {
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current->exit_code = signr;
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current->exit_code = signr;
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current->state = TASK_STOPPED;
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current->state = TASK_STOPPED;
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notify_parent(current, SIGCHLD);
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notify_parent(current, SIGCHLD);
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schedule();
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schedule();
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if (!(signr = current->exit_code))
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if (!(signr = current->exit_code))
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continue;
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continue;
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current->exit_code = 0;
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current->exit_code = 0;
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if (signr == SIGSTOP)
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if (signr == SIGSTOP)
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continue;
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continue;
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if (_S(signr) & current->blocked) {
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if (_S(signr) & current->blocked) {
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current->signal |= _S(signr);
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current->signal |= _S(signr);
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continue;
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continue;
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}
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}
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sa = current->sig->action + signr - 1;
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sa = current->sig->action + signr - 1;
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}
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}
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if (sa->sa_handler == SIG_IGN) {
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if (sa->sa_handler == SIG_IGN) {
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if (signr != SIGCHLD)
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if (signr != SIGCHLD)
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continue;
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continue;
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/* check for SIGCHLD: it's special */
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/* check for SIGCHLD: it's special */
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while (sys_waitpid(-1,NULL,WNOHANG) > 0)
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while (sys_waitpid(-1,NULL,WNOHANG) > 0)
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/* nothing */;
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/* nothing */;
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continue;
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continue;
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}
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}
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if (sa->sa_handler == SIG_DFL) {
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if (sa->sa_handler == SIG_DFL) {
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if (current->pid == 1)
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if (current->pid == 1)
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continue;
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continue;
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switch (signr) {
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switch (signr) {
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case SIGCONT: case SIGCHLD: case SIGWINCH:
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case SIGCONT: case SIGCHLD: case SIGWINCH:
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continue;
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continue;
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case SIGSTOP: case SIGTSTP: case SIGTTIN: case SIGTTOU:
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case SIGSTOP: case SIGTSTP: case SIGTTIN: case SIGTTOU:
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if (current->flags & PF_PTRACED)
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if (current->flags & PF_PTRACED)
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continue;
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continue;
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current->state = TASK_STOPPED;
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current->state = TASK_STOPPED;
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current->exit_code = signr;
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current->exit_code = signr;
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if (!(current->p_pptr->sig->action[SIGCHLD-1].sa_flags &
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if (!(current->p_pptr->sig->action[SIGCHLD-1].sa_flags &
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SA_NOCLDSTOP))
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SA_NOCLDSTOP))
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notify_parent(current, SIGCHLD);
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notify_parent(current, SIGCHLD);
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schedule();
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schedule();
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continue;
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continue;
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case SIGQUIT: case SIGILL: case SIGTRAP:
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case SIGQUIT: case SIGILL: case SIGTRAP:
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case SIGIOT: case SIGFPE: case SIGSEGV:
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case SIGIOT: case SIGFPE: case SIGSEGV:
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if (current->binfmt && current->binfmt->core_dump) {
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if (current->binfmt && current->binfmt->core_dump) {
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if (current->binfmt->core_dump(signr, regs))
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if (current->binfmt->core_dump(signr, regs))
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signr |= 0x80;
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signr |= 0x80;
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}
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}
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/* fall through */
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/* fall through */
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default:
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default:
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current->signal |= _S(signr & 0x7f);
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current->signal |= _S(signr & 0x7f);
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do_exit(signr);
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do_exit(signr);
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}
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}
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}
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}
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/*
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/*
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* OK, we're invoking a handler
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* OK, we're invoking a handler
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*/
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*/
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if ((int)regs->orig_gpr3 >= 0) {
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if ((int)regs->orig_gpr3 >= 0) {
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if ((int)regs->result == -ERESTARTNOHAND ||
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if ((int)regs->result == -ERESTARTNOHAND ||
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((int)regs->result == -ERESTARTSYS && !(sa->sa_flags & SA_RESTART)))
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((int)regs->result == -ERESTARTSYS && !(sa->sa_flags & SA_RESTART)))
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(int)regs->result = -EINTR;
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(int)regs->result = -EINTR;
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}
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}
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handler_signal |= 1 << (signr-1);
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handler_signal |= 1 << (signr-1);
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mask &= ~sa->sa_mask;
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mask &= ~sa->sa_mask;
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}
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}
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if (!handler_signal) /* no handler will be called - return 0 */
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if (!handler_signal) /* no handler will be called - return 0 */
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{
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{
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restore_flags(flags);
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restore_flags(flags);
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return 0;
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return 0;
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}
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}
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nip = regs->pc;
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nip = regs->pc;
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frame = (unsigned long *) regs->sp;
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frame = (unsigned long *) regs->sp;
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/* Build trampoline code on stack */
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/* Build trampoline code on stack */
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frame -= 3;
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frame -= 3;
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trampoline = frame;
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trampoline = frame;
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trampoline[0] = 0x9d607777; /* l.addi r11,r0,0x7777 */
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trampoline[0] = 0x9d607777; /* l.addi r11,r0,0x7777 */
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trampoline[1] = 0x20000001; /* l.sys 1 */
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trampoline[1] = 0x20000001; /* l.sys 1 */
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trampoline[2] = 0x15000000; /* l.nop 0 */
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trampoline[2] = 0x15000000; /* l.nop 0 */
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frame -= sizeof(*regs) / sizeof(long);
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frame -= sizeof(*regs) / sizeof(long);
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regs_ptr = frame;
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regs_ptr = frame;
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memcpy(regs_ptr, regs, sizeof(*regs));
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memcpy(regs_ptr, regs, sizeof(*regs));
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signr = 1;
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signr = 1;
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sa = current->sig->action;
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sa = current->sig->action;
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for (mask = 1 ; mask ; sa++,signr++,mask += mask) {
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for (mask = 1 ; mask ; sa++,signr++,mask += mask) {
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if (mask > handler_signal)
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if (mask > handler_signal)
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break;
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break;
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if (!(mask & handler_signal))
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if (!(mask & handler_signal))
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continue;
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continue;
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frame -= sizeof(struct sigcontext_struct) / sizeof(long);
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frame -= sizeof(struct sigcontext_struct) / sizeof(long);
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sc = (struct sigcontext_struct *)frame;
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sc = (struct sigcontext_struct *)frame;
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nip = (unsigned long) sa->sa_handler;
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nip = (unsigned long) sa->sa_handler;
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#if 0 /* Old compiler */
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#if 0 /* Old compiler */
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nip = *(unsigned long *)nip;
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nip = *(unsigned long *)nip;
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#endif
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#endif
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if (sa->sa_flags & SA_ONESHOT)
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if (sa->sa_flags & SA_ONESHOT)
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sa->sa_handler = NULL;
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sa->sa_handler = NULL;
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sc->handler = nip;
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sc->handler = nip;
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sc->oldmask = current->blocked;
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sc->oldmask = current->blocked;
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sc->regs = (struct pt_regs *)regs_ptr;
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sc->regs = (struct pt_regs *)regs_ptr;
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sc->signal = signr;
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sc->signal = signr;
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current->blocked |= sa->sa_mask;
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current->blocked |= sa->sa_mask;
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regs->gprs[1] = signr; /* r3 = signr */
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regs->gprs[1] = signr; /* r3 = signr */
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regs->gprs[2] = (unsigned long)regs_ptr; /* r4 = regs_ptr */
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regs->gprs[2] = (unsigned long)regs_ptr; /* r4 = regs_ptr */
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}
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}
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regs->gprs[7] = (unsigned long)trampoline; /* r9 = trampoline (r9 is link register) */
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regs->gprs[7] = (unsigned long)trampoline; /* r9 = trampoline (r9 is link register) */
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regs->pc = nip;
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regs->pc = nip;
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regs->sp = (unsigned long)sc;
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regs->sp = (unsigned long)sc;
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/* The DATA cache must be flushed here to insure coherency */
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/* The DATA cache must be flushed here to insure coherency */
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/* between the DATA & INSTRUCTION caches. Since we just */
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/* between the DATA & INSTRUCTION caches. Since we just */
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/* created an instruction stream using the DATA [cache] space */
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/* created an instruction stream using the DATA [cache] space */
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/* and since the instruction cache will not look in the DATA */
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/* and since the instruction cache will not look in the DATA */
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/* cache for new data, we have to force the data to go on to */
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/* cache for new data, we have to force the data to go on to */
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/* memory and flush the instruction cache to force it to look */
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/* memory and flush the instruction cache to force it to look */
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/* there. The following function performs this magic */
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/* there. The following function performs this magic */
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#if ICACHE
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#if ICACHE
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ic_invalidate();
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ic_invalidate();
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#endif
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#endif
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restore_flags(flags);
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restore_flags(flags);
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return 1;
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return 1;
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}
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}
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