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b0375744f1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
445 lines
11 KiB
C
445 lines
11 KiB
C
/*
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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/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 <asm/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 sigframe
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{
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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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unsigned char retcode[8];
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unsigned long extramask[_NSIG_WORDS-1];
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struct sigcontext sc;
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int sig;
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} __attribute__((aligned(2),packed));
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struct rt_sigframe
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{
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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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} __attribute__((aligned(2),packed));
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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_thread_info()->restart_block.fn = do_no_restart_syscall;
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#define COPY(r) err |= __get_user(regs->r, &usc->sc_##r) /* restore passed registers */
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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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wrusp(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_sigreturn(void)
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{
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unsigned long usp = rdusp();
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struct sigframe *frame = (struct 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 (__get_user(set.sig[0], &frame->sc.sc_mask) ||
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(_NSIG_WORDS > 1 &&
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__copy_from_user(&set.sig[1], &frame->extramask,
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sizeof(frame->extramask))))
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goto badframe;
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set_current_blocked(&set);
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if (restore_sigcontext(&frame->sc, &er0))
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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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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 *
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get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
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{
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unsigned long usp;
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/* Default to using normal stack. */
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usp = rdusp();
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/* This is the X/Open sanctioned signal stack switching. */
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if (ka->sa.sa_flags & SA_ONSTACK) {
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if (!sas_ss_flags(usp))
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usp = current->sas_ss_sp + current->sas_ss_size;
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}
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return (void *)((usp - frame_size) & -8UL);
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}
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static int setup_frame (int sig, struct k_sigaction *ka,
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sigset_t *set, struct pt_regs *regs)
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{
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struct sigframe *frame;
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int err = 0;
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int usig;
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unsigned char *ret;
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frame = get_sigframe(ka, regs, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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goto give_sigsegv;
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usig = current_thread_info()->exec_domain
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&& current_thread_info()->exec_domain->signal_invmap
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&& sig < 32
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? current_thread_info()->exec_domain->signal_invmap[sig]
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: sig;
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err |= __put_user(usig, &frame->sig);
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if (err)
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goto give_sigsegv;
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err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
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if (err)
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goto give_sigsegv;
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if (_NSIG_WORDS > 1) {
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err |= copy_to_user(frame->extramask, &set->sig[1],
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sizeof(frame->extramask));
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if (err)
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goto give_sigsegv;
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}
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ret = frame->retcode;
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if (ka->sa.sa_flags & SA_RESTORER)
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ret = (unsigned char *)(ka->sa.sa_restorer);
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else {
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/* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
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err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
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(unsigned long *)(frame->retcode + 0));
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err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
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}
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/* Set up to return from userspace. */
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err |= __put_user(ret, &frame->pretcode);
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if (err)
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goto give_sigsegv;
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/* Set up registers for signal handler */
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wrusp ((unsigned long) frame);
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regs->pc = (unsigned long) ka->sa.sa_handler;
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regs->er0 = (current_thread_info()->exec_domain
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&& current_thread_info()->exec_domain->signal_invmap
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&& sig < 32
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? current_thread_info()->exec_domain->signal_invmap[sig]
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: sig);
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regs->er1 = (unsigned long)&(frame->sc);
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regs->er5 = current->mm->start_data; /* GOT base */
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return 0;
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give_sigsegv:
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force_sigsegv(sig, current);
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return -EFAULT;
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}
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static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
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sigset_t *set, 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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int usig;
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unsigned char *ret;
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frame = get_sigframe(ka, regs, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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goto give_sigsegv;
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usig = current_thread_info()->exec_domain
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&& current_thread_info()->exec_domain->signal_invmap
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&& sig < 32
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? current_thread_info()->exec_domain->signal_invmap[sig]
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: sig;
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err |= __put_user(usig, &frame->sig);
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if (err)
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goto give_sigsegv;
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err |= __put_user(&frame->info, &frame->pinfo);
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err |= __put_user(&frame->uc, &frame->puc);
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err |= copy_siginfo_to_user(&frame->info, info);
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if (err)
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goto give_sigsegv;
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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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goto give_sigsegv;
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/* Set up to return from userspace. */
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ret = frame->retcode;
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if (ka->sa.sa_flags & SA_RESTORER)
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ret = (unsigned char *)(ka->sa.sa_restorer);
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else {
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/* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
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err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
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(unsigned long *)(frame->retcode + 0));
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err |= __put_user(0x5700, (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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goto give_sigsegv;
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/* Set up registers for signal handler */
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wrusp ((unsigned long) frame);
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regs->pc = (unsigned long) ka->sa.sa_handler;
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regs->er0 = (current_thread_info()->exec_domain
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&& current_thread_info()->exec_domain->signal_invmap
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&& sig < 32
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? current_thread_info()->exec_domain->signal_invmap[sig]
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: 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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give_sigsegv:
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force_sigsegv(sig, current);
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return -EFAULT;
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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(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
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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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switch (regs->er0) {
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case -ERESTART_RESTARTBLOCK:
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case -ERESTARTNOHAND:
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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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regs->er0 = regs->orig_er0;
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regs->pc -= 2;
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}
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}
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/* set up the stack frame */
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if (ka->sa.sa_flags & SA_SIGINFO)
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ret = setup_rt_frame(sig, ka, info, oldset, regs);
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else
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ret = setup_frame(sig, ka, oldset, regs);
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if (!ret)
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signal_delivered(sig, info, ka, regs, 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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siginfo_t info;
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int signr;
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struct k_sigaction ka;
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/*
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* We want the common case to go fast, which
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* is why we may in certain cases get here from
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* kernel mode. Just return without doing anything
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* if so.
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*/
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if ((regs->ccr & 0x10))
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return;
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current->thread.esp0 = (unsigned long) regs;
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signr = get_signal_to_deliver(&info, &ka, regs, NULL);
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if (signr > 0) {
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/* Whee! Actually deliver the signal. */
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handle_signal(signr, &info, &ka, 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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/* Restart the system call - no handlers present */
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if (regs->er0 == -ERESTARTNOHAND ||
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regs->er0 == -ERESTARTSYS ||
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regs->er0 == -ERESTARTNOINTR) {
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regs->er0 = regs->orig_er0;
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regs->pc -= 2;
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}
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if (regs->er0 == -ERESTART_RESTARTBLOCK){
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regs->er0 = __NR_restart_syscall;
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regs->pc -= 2;
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}
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}
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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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