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Diffstat (limited to 'arch/cris/arch-v10/kernel/signal.c')
-rw-r--r--arch/cris/arch-v10/kernel/signal.c440
1 files changed, 0 insertions, 440 deletions
diff --git a/arch/cris/arch-v10/kernel/signal.c b/arch/cris/arch-v10/kernel/signal.c
deleted file mode 100644
index 2beffc37faf8..000000000000
--- a/arch/cris/arch-v10/kernel/signal.c
+++ /dev/null
@@ -1,440 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/arch/cris/kernel/signal.c
- *
- * Based on arch/i386/kernel/signal.c by
- * Copyright (C) 1991, 1992 Linus Torvalds
- * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson *
- *
- * Ideas also taken from arch/arm.
- *
- * Copyright (C) 2000-2007 Axis Communications AB
- *
- * Authors: Bjorn Wesen (bjornw@axis.com)
- *
- */
-
-#include <linux/sched.h>
-#include <linux/sched/task_stack.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/ptrace.h>
-#include <linux/unistd.h>
-#include <linux/stddef.h>
-
-#include <asm/processor.h>
-#include <asm/ucontext.h>
-#include <linux/uaccess.h>
-#include <arch/system.h>
-
-#define DEBUG_SIG 0
-
-/* a syscall in Linux/CRIS is a break 13 instruction which is 2 bytes */
-/* manipulate regs so that upon return, it will be re-executed */
-
-/* We rely on that pc points to the instruction after "break 13", so the
- * library must never do strange things like putting it in a delay slot.
- */
-#define RESTART_CRIS_SYS(regs) regs->r10 = regs->orig_r10; regs->irp -= 2;
-
-void do_signal(int canrestart, struct pt_regs *regs);
-
-/*
- * Do a signal return; undo the signal stack.
- */
-
-struct sigframe {
- struct sigcontext sc;
- unsigned long extramask[_NSIG_WORDS-1];
- unsigned char retcode[8]; /* trampoline code */
-};
-
-struct rt_sigframe {
- struct siginfo *pinfo;
- void *puc;
- struct siginfo info;
- struct ucontext uc;
- unsigned char retcode[8]; /* trampoline code */
-};
-
-
-static int
-restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
-{
- unsigned int err = 0;
- unsigned long old_usp;
-
- /* Always make any pending restarted system calls return -EINTR */
- current->restart_block.fn = do_no_restart_syscall;
-
- /* restore the regs from &sc->regs (same as sc, since regs is first)
- * (sc is already checked for VERIFY_READ since the sigframe was
- * checked in sys_sigreturn previously)
- */
-
- if (__copy_from_user(regs, sc, sizeof(struct pt_regs)))
- goto badframe;
-
- /* make sure the U-flag is set so user-mode cannot fool us */
-
- regs->dccr |= 1 << 8;
-
- /* restore the old USP as it was before we stacked the sc etc.
- * (we cannot just pop the sigcontext since we aligned the sp and
- * stuff after pushing it)
- */
-
- err |= __get_user(old_usp, &sc->usp);
-
- wrusp(old_usp);
-
- /* TODO: the other ports use regs->orig_XX to disable syscall checks
- * after this completes, but we don't use that mechanism. maybe we can
- * use it now ?
- */
-
- return err;
-
-badframe:
- return 1;
-}
-
-asmlinkage int sys_sigreturn(void)
-{
- struct pt_regs *regs = current_pt_regs();
- struct sigframe __user *frame = (struct sigframe *)rdusp();
- sigset_t set;
-
- /*
- * Since we stacked the signal on a dword boundary,
- * then frame should be dword aligned here. If it's
- * not, then the user is trying to mess with us.
- */
- if (((long)frame) & 3)
- goto badframe;
-
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
- goto badframe;
- if (__get_user(set.sig[0], &frame->sc.oldmask)
- || (_NSIG_WORDS > 1
- && __copy_from_user(&set.sig[1], frame->extramask,
- sizeof(frame->extramask))))
- goto badframe;
-
- set_current_blocked(&set);
-
- if (restore_sigcontext(regs, &frame->sc))
- goto badframe;
-
- /* TODO: SIGTRAP when single-stepping as in arm ? */
-
- return regs->r10;
-
-badframe:
- force_sig(SIGSEGV, current);
- return 0;
-}
-
-asmlinkage int sys_rt_sigreturn(void)
-{
- struct pt_regs *regs = current_pt_regs();
- struct rt_sigframe __user *frame = (struct rt_sigframe *)rdusp();
- sigset_t set;
-
- /*
- * Since we stacked the signal on a dword boundary,
- * then frame should be dword aligned here. If it's
- * not, then the user is trying to mess with us.
- */
- if (((long)frame) & 3)
- goto badframe;
-
- 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))
- goto badframe;
-
- if (restore_altstack(&frame->uc.uc_stack))
- goto badframe;
-
- return regs->r10;
-
-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;
- unsigned long usp = rdusp();
-
- /* copy the regs. they are first in sc so we can use sc directly */
-
- err |= __copy_to_user(sc, regs, sizeof(struct pt_regs));
-
- /* Set the frametype to CRIS_FRAME_NORMAL for the execution of
- the signal handler. The frametype will be restored to its previous
- value in restore_sigcontext. */
- regs->frametype = CRIS_FRAME_NORMAL;
-
- /* then some other stuff */
-
- err |= __put_user(mask, &sc->oldmask);
-
- err |= __put_user(usp, &sc->usp);
-
- return err;
-}
-
-/* Figure out where we want to put the new signal frame
- * - usually on the stack. */
-
-static inline void __user *
-get_sigframe(struct ksignal *ksig, size_t frame_size)
-{
- unsigned long sp = sigsp(rdusp(), ksig);
-
- /* make sure the frame is dword-aligned */
-
- sp &= ~3;
-
- return (void __user*)(sp - frame_size);
-}
-
-/* grab and setup a signal frame.
- *
- * basically we stack a lot of state info, and arrange for the
- * user-mode program to return to the kernel using either a
- * trampoline which performs the syscall sigreturn, or a provided
- * user-mode trampoline.
- */
-
-static int setup_frame(struct ksignal *ksig, sigset_t *set,
- struct pt_regs *regs)
-{
- struct sigframe __user *frame;
- unsigned long return_ip;
- int err = 0;
-
- frame = get_sigframe(ksig, sizeof(*frame));
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- return -EFAULT;
-
- err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
- if (err)
- return -EFAULT;
-
- if (_NSIG_WORDS > 1) {
- err |= __copy_to_user(frame->extramask, &set->sig[1],
- sizeof(frame->extramask));
- }
- if (err)
- return -EFAULT;
-
- /* Set up to return from userspace. If provided, use a stub
- already in userspace. */
- if (ksig->ka.sa.sa_flags & SA_RESTORER) {
- return_ip = (unsigned long)ksig->ka.sa.sa_restorer;
- } else {
- /* trampoline - the desired return ip is the retcode itself */
- return_ip = (unsigned long)&frame->retcode;
- /* This is movu.w __NR_sigreturn, r9; break 13; */
- err |= __put_user(0x9c5f, (short __user*)(frame->retcode+0));
- err |= __put_user(__NR_sigreturn, (short __user*)(frame->retcode+2));
- err |= __put_user(0xe93d, (short __user*)(frame->retcode+4));
- }
-
- if (err)
- return -EFAULT;
-
- /* Set up registers for signal handler */
-
- regs->irp = (unsigned long) ksig->ka.sa.sa_handler; /* what we enter NOW */
- regs->srp = return_ip; /* what we enter LATER */
- regs->r10 = ksig->sig; /* first argument is signo */
-
- /* actually move the usp to reflect the stacked frame */
-
- wrusp((unsigned long)frame);
-
- return 0;
-}
-
-static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
- struct pt_regs *regs)
-{
- struct rt_sigframe __user *frame;
- unsigned long return_ip;
- int err = 0;
-
- frame = get_sigframe(ksig, sizeof(*frame));
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- 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;
-
- /* Clear all the bits of the ucontext we don't use. */
- err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
-
- err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
-
- err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-
- err |= __save_altstack(&frame->uc.uc_stack, rdusp());
-
- if (err)
- return -EFAULT;
-
- /* Set up to return from userspace. If provided, use a stub
- already in userspace. */
- if (ksig->ka.sa.sa_flags & SA_RESTORER) {
- return_ip = (unsigned long)ksig->ka.sa.sa_restorer;
- } else {
- /* trampoline - the desired return ip is the retcode itself */
- return_ip = (unsigned long)&frame->retcode;
- /* This is movu.w __NR_rt_sigreturn, r9; break 13; */
- err |= __put_user(0x9c5f, (short __user *)(frame->retcode+0));
- err |= __put_user(__NR_rt_sigreturn,
- (short __user *)(frame->retcode+2));
- err |= __put_user(0xe93d, (short __user *)(frame->retcode+4));
- }
-
- if (err)
- return -EFAULT;
-
- /* Set up registers for signal handler */
-
- /* What we enter NOW */
- regs->irp = (unsigned long) ksig->ka.sa.sa_handler;
- /* What we enter LATER */
- regs->srp = return_ip;
- /* First argument is signo */
- regs->r10 = ksig->sig;
- /* Second argument is (siginfo_t *) */
- regs->r11 = (unsigned long)&frame->info;
- /* Third argument is unused */
- regs->r12 = 0;
-
- /* Actually move the usp to reflect the stacked frame */
- wrusp((unsigned long)frame);
-
- return 0;
-}
-
-/*
- * OK, we're invoking a handler
- */
-
-static inline void handle_signal(int canrestart, struct ksignal *ksig,
- struct pt_regs *regs)
-{
- sigset_t *oldset = sigmask_to_save();
- int ret;
-
- /* Are we from a system call? */
- if (canrestart) {
- /* If so, check system call restarting.. */
- switch (regs->r10) {
- case -ERESTART_RESTARTBLOCK:
- case -ERESTARTNOHAND:
- /* ERESTARTNOHAND means that the syscall should
- * only be restarted if there was no handler for
- * the signal, and since we only get here if there
- * is a handler, we don't restart */
- regs->r10 = -EINTR;
- break;
- case -ERESTARTSYS:
- /* ERESTARTSYS means to restart the syscall if
- * there is no handler or the handler was
- * registered with SA_RESTART */
- if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
- regs->r10 = -EINTR;
- break;
- }
- /* fallthrough */
- case -ERESTARTNOINTR:
- /* ERESTARTNOINTR means that the syscall should
- * be called again after the signal handler returns. */
- RESTART_CRIS_SYS(regs);
- }
- }
-
- /* Set up the stack frame */
- if (ksig->ka.sa.sa_flags & SA_SIGINFO)
- ret = setup_rt_frame(ksig, oldset, regs);
- else
- ret = setup_frame(ksig, oldset, 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.
- *
- * Also note that the regs structure given here as an argument, is the latest
- * pushed pt_regs. It may or may not be the same as the first pushed registers
- * when the initial usermode->kernelmode transition took place. Therefore
- * we can use user_mode(regs) to see if we came directly from kernel or user
- * mode below.
- */
-
-void do_signal(int canrestart, 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)) {
- /* Whee! Actually deliver the signal. */
- handle_signal(canrestart, &ksig, regs);
- return;
- }
-
- /* Did we come from a system call? */
- if (canrestart) {
- /* Restart the system call - no handlers present */
- if (regs->r10 == -ERESTARTNOHAND ||
- regs->r10 == -ERESTARTSYS ||
- regs->r10 == -ERESTARTNOINTR) {
- RESTART_CRIS_SYS(regs);
- }
- if (regs->r10 == -ERESTART_RESTARTBLOCK) {
- regs->r9 = __NR_restart_syscall;
- regs->irp -= 2;
- }
- }
-
- /* if there's no signal to deliver, we just put the saved sigmask
- * back */
- restore_saved_sigmask();
-}
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