291 lines
7.0 KiB
C
291 lines
7.0 KiB
C
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/*
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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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* uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp>
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* and David McCullough <davidm@snapgear.com>
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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/tracehook.h>
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#include <asm/setup.h>
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#include <linux/uaccess.h>
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#include <asm/pgtable.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(VERIFY_READ, 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, current);
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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(VERIFY_WRITE, 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)
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do_signal(regs);
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if (thread_info_flags & _TIF_NOTIFY_RESUME) {
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clear_thread_flag(TIF_NOTIFY_RESUME);
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tracehook_notify_resume(regs);
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}
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}
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