+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/arch/m32r/kernel/signal.c
- *
- * Copyright (c) 2003 Hitoshi Yamamoto
- *
- * Taken from i386 version.
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
- * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
- */
-
-#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/unistd.h>
-#include <linux/stddef.h>
-#include <linux/personality.h>
-#include <linux/tracehook.h>
-#include <asm/cacheflush.h>
-#include <asm/ucontext.h>
-#include <linux/uaccess.h>
-
-#define DEBUG_SIG 0
-
-/*
- * Do a signal return; undo the signal stack.
- */
-
-struct rt_sigframe
-{
- int sig;
- struct siginfo __user *pinfo;
- void __user *puc;
- struct siginfo info;
- struct ucontext uc;
-// struct _fpstate fpstate;
-};
-
-static int
-restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
- int *r0_p)
-{
- unsigned int err = 0;
-
- /* Always make any pending restarted system calls return -EINTR */
- current->restart_block.fn = do_no_restart_syscall;
-
-#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
- COPY(r4);
- COPY(r5);
- COPY(r6);
- COPY(pt_regs);
- /* COPY(r0); Skip r0 */
- COPY(r1);
- COPY(r2);
- COPY(r3);
- COPY(r7);
- COPY(r8);
- COPY(r9);
- COPY(r10);
- COPY(r11);
- COPY(r12);
- COPY(acc0h);
- COPY(acc0l);
- COPY(acc1h); /* ISA_DSP_LEVEL2 only */
- COPY(acc1l); /* ISA_DSP_LEVEL2 only */
- COPY(psw);
- COPY(bpc);
- COPY(bbpsw);
- COPY(bbpc);
- COPY(spu);
- COPY(fp);
- COPY(lr);
- COPY(spi);
-#undef COPY
-
- regs->syscall_nr = -1; /* disable syscall checks */
- err |= __get_user(*r0_p, &sc->sc_r0);
-
- return err;
-}
-
-asmlinkage int
-sys_rt_sigreturn(unsigned long r0, unsigned long r1,
- unsigned long r2, unsigned long r3, unsigned long r4,
- unsigned long r5, unsigned long r6, struct pt_regs *regs)
-{
- struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
- sigset_t set;
- int result;
-
- 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(regs, &frame->uc.uc_mcontext, &result))
- goto badframe;
-
- if (restore_altstack(&frame->uc.uc_stack))
- goto badframe;
-
- return result;
-
-badframe:
- force_sig(SIGSEGV, current);
- return 0;
-}
-
-/*
- * Set up a signal frame.
- */
-
-static int
-setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
- unsigned long mask)
-{
- int err = 0;
-
-#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
- COPY(r4);
- COPY(r5);
- COPY(r6);
- COPY(pt_regs);
- COPY(r0);
- COPY(r1);
- COPY(r2);
- COPY(r3);
- COPY(r7);
- COPY(r8);
- COPY(r9);
- COPY(r10);
- COPY(r11);
- COPY(r12);
- COPY(acc0h);
- COPY(acc0l);
- COPY(acc1h); /* ISA_DSP_LEVEL2 only */
- COPY(acc1l); /* ISA_DSP_LEVEL2 only */
- COPY(psw);
- COPY(bpc);
- COPY(bbpsw);
- COPY(bbpc);
- COPY(spu);
- COPY(fp);
- COPY(lr);
- COPY(spi);
-#undef COPY
-
- err |= __put_user(mask, &sc->oldmask);
-
- return err;
-}
-
-/*
- * Determine which stack to use..
- */
-static inline void __user *
-get_sigframe(struct ksignal *ksig, unsigned long sp, size_t frame_size)
-{
- return (void __user *)((sigsp(sp, ksig) - frame_size) & -8ul);
-}
-
-static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
- struct pt_regs *regs)
-{
- struct rt_sigframe __user *frame;
- int err = 0;
- int sig = ksig->sig;
-
- frame = get_sigframe(ksig, regs->spu, sizeof(*frame));
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- return -EFAULT;
-
- err |= __put_user(sig, &frame->sig);
- if (err)
- return -EFAULT;
-
- err |= __put_user(&frame->info, &frame->pinfo);
- err |= __put_user(&frame->uc, &frame->puc);
- err |= copy_siginfo_to_user(&frame->info, &ksig->info);
- if (err)
- return -EFAULT;
-
- /* Create the ucontext. */
- err |= __put_user(0, &frame->uc.uc_flags);
- err |= __put_user(0, &frame->uc.uc_link);
- err |= __save_altstack(&frame->uc.uc_stack, regs->spu);
- err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
- err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
- if (err)
- return -EFAULT;
-
- /* Set up to return from userspace. */
- regs->lr = (unsigned long)ksig->ka.sa.sa_restorer;
-
- /* Set up registers for signal handler */
- regs->spu = (unsigned long)frame;
- regs->r0 = sig; /* Arg for signal handler */
- regs->r1 = (unsigned long)&frame->info;
- regs->r2 = (unsigned long)&frame->uc;
- regs->bpc = (unsigned long)ksig->ka.sa.sa_handler;
-
-#if DEBUG_SIG
- printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
- current->comm, current->pid, frame, regs->pc);
-#endif
-
- return 0;
-}
-
-static int prev_insn(struct pt_regs *regs)
-{
- u16 inst;
- if (get_user(inst, (u16 __user *)(regs->bpc - 2)))
- return -EFAULT;
- if ((inst & 0xfff0) == 0x10f0) /* trap ? */
- regs->bpc -= 2;
- else
- regs->bpc -= 4;
- regs->syscall_nr = -1;
- return 0;
-}
-
-/*
- * OK, we're invoking a handler
- */
-
-static void
-handle_signal(struct ksignal *ksig, struct pt_regs *regs)
-{
- int ret;
-
- /* Are we from a system call? */
- if (regs->syscall_nr >= 0) {
- /* If so, check system call restarting.. */
- switch (regs->r0) {
- case -ERESTART_RESTARTBLOCK:
- case -ERESTARTNOHAND:
- regs->r0 = -EINTR;
- break;
-
- case -ERESTARTSYS:
- if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
- regs->r0 = -EINTR;
- break;
- }
- /* fallthrough */
- case -ERESTARTNOINTR:
- regs->r0 = regs->orig_r0;
- if (prev_insn(regs) < 0)
- return;
- }
- }
-
- /* Set up the stack frame */
- ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
-
- signal_setup_done(ret, ksig, 0);
-}
-
-/*
- * 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(struct pt_regs *regs)
-{
- struct ksignal ksig;
-
- /*
- * 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;
-
- if (get_signal(&ksig)) {
- /* Re-enable any watchpoints before delivering the
- * signal to user space. The processor register will
- * have been cleared if the watchpoint triggered
- * inside the kernel.
- */
-
- /* Whee! Actually deliver the signal. */
- handle_signal(&ksig, regs);
-
- return;
- }
-
- /* Did we come from a system call? */
- if (regs->syscall_nr >= 0) {
- /* Restart the system call - no handlers present */
- if (regs->r0 == -ERESTARTNOHAND ||
- regs->r0 == -ERESTARTSYS ||
- regs->r0 == -ERESTARTNOINTR) {
- regs->r0 = regs->orig_r0;
- prev_insn(regs);
- } else if (regs->r0 == -ERESTART_RESTARTBLOCK){
- regs->r0 = regs->orig_r0;
- regs->r7 = __NR_restart_syscall;
- prev_insn(regs);
- }
- }
- restore_saved_sigmask();
-}
-
-/*
- * notification of userspace execution resumption
- * - triggered by current->work.notify_resume
- */
-void do_notify_resume(struct pt_regs *regs, __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(regs);
-
- if (thread_info_flags & _TIF_NOTIFY_RESUME) {
- clear_thread_flag(TIF_NOTIFY_RESUME);
- tracehook_notify_resume(regs);
- }
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff