diff options
Diffstat (limited to 'arch/m32r/kernel/signal.c')
-rw-r--r-- | arch/m32r/kernel/signal.c | 336 |
1 files changed, 0 insertions, 336 deletions
diff --git a/arch/m32r/kernel/signal.c b/arch/m32r/kernel/signal.c deleted file mode 100644 index ba4d8d6330f1..000000000000 --- a/arch/m32r/kernel/signal.c +++ /dev/null @@ -1,336 +0,0 @@ -// 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); - } -} |