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287 lines
6.9 KiB
287 lines
6.9 KiB
/* |
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* linux/arch/h8300/kernel/signal.c |
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* |
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* Copyright (C) 1991, 1992 Linus Torvalds |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file COPYING in the main directory of this archive |
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* for more details. |
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*/ |
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|
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/* |
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* uClinux H8/300 support by Yoshinori Sato <[email protected]> |
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* and David McCullough <[email protected]> |
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* |
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* Based on |
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* Linux/m68k by Hamish Macdonald |
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*/ |
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/* |
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* ++roman (07/09/96): implemented signal stacks (specially for tosemu on |
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* Atari :-) Current limitation: Only one sigstack can be active at one time. |
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* If a second signal with SA_ONSTACK set arrives while working on a sigstack, |
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* SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested |
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* signal handlers! |
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*/ |
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#include <linux/sched.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/mm.h> |
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#include <linux/kernel.h> |
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#include <linux/signal.h> |
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#include <linux/syscalls.h> |
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#include <linux/errno.h> |
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#include <linux/wait.h> |
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#include <linux/ptrace.h> |
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#include <linux/unistd.h> |
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#include <linux/stddef.h> |
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#include <linux/highuid.h> |
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#include <linux/personality.h> |
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#include <linux/tty.h> |
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#include <linux/binfmts.h> |
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#include <linux/resume_user_mode.h> |
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#include <asm/setup.h> |
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#include <linux/uaccess.h> |
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#include <asm/traps.h> |
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#include <asm/ucontext.h> |
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/* |
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* Do a signal return; undo the signal stack. |
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* |
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* Keep the return code on the stack quadword aligned! |
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* That makes the cache flush below easier. |
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*/ |
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struct rt_sigframe { |
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long dummy_er0; |
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long dummy_vector; |
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#if defined(CONFIG_CPU_H8S) |
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short dummy_exr; |
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#endif |
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long dummy_pc; |
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char *pretcode; |
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struct siginfo *pinfo; |
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void *puc; |
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unsigned char retcode[8]; |
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struct siginfo info; |
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struct ucontext uc; |
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int sig; |
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} __packed __aligned(2); |
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static inline int |
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restore_sigcontext(struct sigcontext *usc, int *pd0) |
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{ |
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struct pt_regs *regs = current_pt_regs(); |
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int err = 0; |
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unsigned int ccr; |
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unsigned int usp; |
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unsigned int er0; |
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/* Always make any pending restarted system calls return -EINTR */ |
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current->restart_block.fn = do_no_restart_syscall; |
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/* restore passed registers */ |
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#define COPY(r) do { err |= get_user(regs->r, &usc->sc_##r); } while (0) |
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COPY(er1); |
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COPY(er2); |
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COPY(er3); |
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COPY(er5); |
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COPY(pc); |
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ccr = regs->ccr & 0x10; |
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COPY(ccr); |
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#undef COPY |
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regs->ccr &= 0xef; |
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regs->ccr |= ccr; |
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regs->orig_er0 = -1; /* disable syscall checks */ |
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err |= __get_user(usp, &usc->sc_usp); |
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regs->sp = usp; |
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err |= __get_user(er0, &usc->sc_er0); |
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*pd0 = er0; |
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return err; |
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} |
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asmlinkage int sys_rt_sigreturn(void) |
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{ |
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unsigned long usp = rdusp(); |
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struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4); |
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sigset_t set; |
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int er0; |
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if (!access_ok(frame, sizeof(*frame))) |
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goto badframe; |
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if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
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goto badframe; |
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set_current_blocked(&set); |
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if (restore_sigcontext(&frame->uc.uc_mcontext, &er0)) |
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goto badframe; |
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if (restore_altstack(&frame->uc.uc_stack)) |
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goto badframe; |
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return er0; |
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badframe: |
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force_sig(SIGSEGV); |
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return 0; |
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} |
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static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, |
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unsigned long mask) |
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{ |
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int err = 0; |
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err |= __put_user(regs->er0, &sc->sc_er0); |
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err |= __put_user(regs->er1, &sc->sc_er1); |
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err |= __put_user(regs->er2, &sc->sc_er2); |
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err |= __put_user(regs->er3, &sc->sc_er3); |
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err |= __put_user(regs->er4, &sc->sc_er4); |
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err |= __put_user(regs->er5, &sc->sc_er5); |
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err |= __put_user(regs->er6, &sc->sc_er6); |
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err |= __put_user(rdusp(), &sc->sc_usp); |
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err |= __put_user(regs->pc, &sc->sc_pc); |
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err |= __put_user(regs->ccr, &sc->sc_ccr); |
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err |= __put_user(mask, &sc->sc_mask); |
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return err; |
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} |
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static inline void __user * |
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get_sigframe(struct ksignal *ksig, struct pt_regs *regs, size_t frame_size) |
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{ |
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return (void __user *)((sigsp(rdusp(), ksig) - frame_size) & -8UL); |
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} |
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static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, |
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struct pt_regs *regs) |
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{ |
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struct rt_sigframe *frame; |
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int err = 0; |
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unsigned char *ret; |
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frame = get_sigframe(ksig, regs, sizeof(*frame)); |
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if (!access_ok(frame, sizeof(*frame))) |
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return -EFAULT; |
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if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
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err |= copy_siginfo_to_user(&frame->info, &ksig->info); |
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/* Create the ucontext. */ |
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err |= __put_user(0, &frame->uc.uc_flags); |
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err |= __put_user(0, &frame->uc.uc_link); |
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err |= __save_altstack(&frame->uc.uc_stack, rdusp()); |
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err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]); |
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err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
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if (err) |
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return -EFAULT; |
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/* Set up to return from userspace. */ |
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ret = (unsigned char *)&frame->retcode; |
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if (ksig->ka.sa.sa_flags & SA_RESTORER) |
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ret = (unsigned char *)(ksig->ka.sa.sa_restorer); |
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else { |
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/* sub.l er0,er0; mov.b #__NR_rt_sigreturn,r0l; trapa #0 */ |
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err |= __put_user(0x1a80f800 + (__NR_rt_sigreturn & 0xff), |
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(unsigned long *)(frame->retcode + 0)); |
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err |= __put_user(0x5700, |
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(unsigned short *)(frame->retcode + 4)); |
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} |
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err |= __put_user(ret, &frame->pretcode); |
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if (err) |
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return -EFAULT; |
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/* Set up registers for signal handler */ |
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regs->sp = (unsigned long)frame; |
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regs->pc = (unsigned long)ksig->ka.sa.sa_handler; |
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regs->er0 = ksig->sig; |
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regs->er1 = (unsigned long)&(frame->info); |
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regs->er2 = (unsigned long)&frame->uc; |
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regs->er5 = current->mm->start_data; /* GOT base */ |
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return 0; |
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} |
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static void |
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handle_restart(struct pt_regs *regs, struct k_sigaction *ka) |
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{ |
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switch (regs->er0) { |
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case -ERESTARTNOHAND: |
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if (!ka) |
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goto do_restart; |
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regs->er0 = -EINTR; |
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break; |
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case -ERESTART_RESTARTBLOCK: |
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if (!ka) { |
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regs->er0 = __NR_restart_syscall; |
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regs->pc -= 2; |
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} else |
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regs->er0 = -EINTR; |
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break; |
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case -ERESTARTSYS: |
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if (!(ka->sa.sa_flags & SA_RESTART)) { |
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regs->er0 = -EINTR; |
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break; |
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} |
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fallthrough; |
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case -ERESTARTNOINTR: |
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do_restart: |
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regs->er0 = regs->orig_er0; |
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regs->pc -= 2; |
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break; |
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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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*/ |
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static void |
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handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
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{ |
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sigset_t *oldset = sigmask_to_save(); |
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int ret; |
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/* are we from a system call? */ |
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if (regs->orig_er0 >= 0) |
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handle_restart(regs, &ksig->ka); |
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ret = setup_rt_frame(ksig, oldset, regs); |
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signal_setup_done(ret, ksig, 0); |
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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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* want to handle. Thus you cannot kill init even with a SIGKILL even by |
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* mistake. |
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*/ |
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static void do_signal(struct pt_regs *regs) |
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{ |
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struct ksignal ksig; |
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current->thread.esp0 = (unsigned long) regs; |
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if (get_signal(&ksig)) { |
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/* Whee! Actually deliver the signal. */ |
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handle_signal(&ksig, regs); |
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return; |
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} |
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/* Did we come from a system call? */ |
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if (regs->orig_er0 >= 0) |
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handle_restart(regs, NULL); |
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/* If there's no signal to deliver, we just restore the saved mask. */ |
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restore_saved_sigmask(); |
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} |
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asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags) |
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{ |
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if (thread_info_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) |
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do_signal(regs); |
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if (thread_info_flags & _TIF_NOTIFY_RESUME) |
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resume_user_mode_work(regs); |
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}
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