337 lines
7.2 KiB
C
337 lines
7.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/m32r/kernel/signal.c
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*
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* Copyright (c) 2003 Hitoshi Yamamoto
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*
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* Taken from i386 version.
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
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* 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
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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/smp.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/unistd.h>
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#include <linux/stddef.h>
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#include <linux/personality.h>
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#include <linux/tracehook.h>
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#include <asm/cacheflush.h>
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#include <asm/ucontext.h>
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#include <linux/uaccess.h>
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#define DEBUG_SIG 0
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/*
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* Do a signal return; undo the signal stack.
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*/
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struct rt_sigframe
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{
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int sig;
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struct siginfo __user *pinfo;
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void __user *puc;
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struct siginfo info;
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struct ucontext uc;
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// struct _fpstate fpstate;
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};
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static int
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restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
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int *r0_p)
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{
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unsigned int err = 0;
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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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#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
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COPY(r4);
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COPY(r5);
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COPY(r6);
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COPY(pt_regs);
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/* COPY(r0); Skip r0 */
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COPY(r1);
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COPY(r2);
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COPY(r3);
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COPY(r7);
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COPY(r8);
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COPY(r9);
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COPY(r10);
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COPY(r11);
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COPY(r12);
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COPY(acc0h);
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COPY(acc0l);
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COPY(acc1h); /* ISA_DSP_LEVEL2 only */
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COPY(acc1l); /* ISA_DSP_LEVEL2 only */
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COPY(psw);
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COPY(bpc);
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COPY(bbpsw);
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COPY(bbpc);
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COPY(spu);
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COPY(fp);
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COPY(lr);
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COPY(spi);
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#undef COPY
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regs->syscall_nr = -1; /* disable syscall checks */
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err |= __get_user(*r0_p, &sc->sc_r0);
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return err;
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}
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asmlinkage int
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sys_rt_sigreturn(unsigned long r0, unsigned long r1,
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unsigned long r2, unsigned long r3, unsigned long r4,
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unsigned long r5, unsigned long r6, struct pt_regs *regs)
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{
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struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
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sigset_t set;
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int result;
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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(regs, &frame->uc.uc_mcontext, &result))
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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 result;
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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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/*
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* Set up a signal frame.
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*/
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static int
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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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#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
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COPY(r4);
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COPY(r5);
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COPY(r6);
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COPY(pt_regs);
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COPY(r0);
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COPY(r1);
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COPY(r2);
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COPY(r3);
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COPY(r7);
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COPY(r8);
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COPY(r9);
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COPY(r10);
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COPY(r11);
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COPY(r12);
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COPY(acc0h);
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COPY(acc0l);
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COPY(acc1h); /* ISA_DSP_LEVEL2 only */
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COPY(acc1l); /* ISA_DSP_LEVEL2 only */
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COPY(psw);
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COPY(bpc);
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COPY(bbpsw);
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COPY(bbpc);
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COPY(spu);
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COPY(fp);
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COPY(lr);
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COPY(spi);
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#undef COPY
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err |= __put_user(mask, &sc->oldmask);
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return err;
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}
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/*
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* Determine which stack to use..
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*/
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static inline void __user *
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get_sigframe(struct ksignal *ksig, unsigned long sp, size_t frame_size)
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{
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return (void __user *)((sigsp(sp, 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 __user *frame;
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int err = 0;
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int sig = ksig->sig;
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frame = get_sigframe(ksig, regs->spu, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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return -EFAULT;
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err |= __put_user(sig, &frame->sig);
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if (err)
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return -EFAULT;
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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, &ksig->info);
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if (err)
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return -EFAULT;
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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, regs->spu);
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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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regs->lr = (unsigned long)ksig->ka.sa.sa_restorer;
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/* Set up registers for signal handler */
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regs->spu = (unsigned long)frame;
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regs->r0 = sig; /* Arg for signal handler */
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regs->r1 = (unsigned long)&frame->info;
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regs->r2 = (unsigned long)&frame->uc;
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regs->bpc = (unsigned long)ksig->ka.sa.sa_handler;
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#if DEBUG_SIG
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printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
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current->comm, current->pid, frame, regs->pc);
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#endif
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return 0;
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}
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static int prev_insn(struct pt_regs *regs)
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{
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u16 inst;
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if (get_user(inst, (u16 __user *)(regs->bpc - 2)))
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return -EFAULT;
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if ((inst & 0xfff0) == 0x10f0) /* trap ? */
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regs->bpc -= 2;
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else
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regs->bpc -= 4;
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regs->syscall_nr = -1;
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return 0;
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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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int ret;
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/* Are we from a system call? */
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if (regs->syscall_nr >= 0) {
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/* If so, check system call restarting.. */
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switch (regs->r0) {
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case -ERESTART_RESTARTBLOCK:
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case -ERESTARTNOHAND:
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regs->r0 = -EINTR;
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break;
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case -ERESTARTSYS:
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if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
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regs->r0 = -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->r0 = regs->orig_r0;
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if (prev_insn(regs) < 0)
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return;
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}
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}
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/* Set up the stack frame */
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ret = setup_rt_frame(ksig, sigmask_to_save(), 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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/*
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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 (!user_mode(regs))
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return;
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if (get_signal(&ksig)) {
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/* Re-enable any watchpoints before delivering the
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* signal to user space. The processor register will
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* have been cleared if the watchpoint triggered
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* inside the kernel.
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*/
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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->syscall_nr >= 0) {
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/* Restart the system call - no handlers present */
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if (regs->r0 == -ERESTARTNOHAND ||
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regs->r0 == -ERESTARTSYS ||
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regs->r0 == -ERESTARTNOINTR) {
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regs->r0 = regs->orig_r0;
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prev_insn(regs);
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} else if (regs->r0 == -ERESTART_RESTARTBLOCK){
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regs->r0 = regs->orig_r0;
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regs->r7 = __NR_restart_syscall;
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prev_insn(regs);
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}
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}
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restore_saved_sigmask();
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}
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/*
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* notification of userspace execution resumption
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* - triggered by current->work.notify_resume
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*/
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void do_notify_resume(struct pt_regs *regs, __u32 thread_info_flags)
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{
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/* Pending single-step? */
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if (thread_info_flags & _TIF_SINGLESTEP)
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clear_thread_flag(TIF_SINGLESTEP);
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/* deal with pending signal delivery */
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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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