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Diffstat (limited to 'arch/cris/arch-v32/kernel/signal.c')
-rw-r--r--arch/cris/arch-v32/kernel/signal.c541
1 files changed, 0 insertions, 541 deletions
diff --git a/arch/cris/arch-v32/kernel/signal.c b/arch/cris/arch-v32/kernel/signal.c
deleted file mode 100644
index 4f2e3ba3bf40..000000000000
--- a/arch/cris/arch-v32/kernel/signal.c
+++ /dev/null
@@ -1,541 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2003, Axis Communications AB.
- */
-
-#include <linux/sched.h>
-#include <linux/sched/task_stack.h>
-#include <linux/mm.h>
-#include <linux/slab.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 <linux/syscalls.h>
-#include <linux/vmalloc.h>
-
-#include <asm/io.h>
-#include <asm/processor.h>
-#include <asm/ucontext.h>
-#include <linux/uaccess.h>
-#include <arch/hwregs/cpu_vect.h>
-
-extern unsigned long cris_signal_return_page;
-
-/*
- * A syscall in CRIS is really a "break 13" instruction, which is 2
- * bytes. The registers is manipulated so upon return the instruction
- * will be executed again.
- *
- * This relies on that PC points to the instruction after the break call.
- */
-#define RESTART_CRIS_SYS(regs) regs->r10 = regs->orig_r10; regs->erp -= 2;
-
-/* Signal frames. */
-struct signal_frame {
- struct sigcontext sc;
- unsigned long extramask[_NSIG_WORDS - 1];
- unsigned char retcode[8]; /* Trampoline code. */
-};
-
-struct rt_signal_frame {
- struct siginfo *pinfo;
- void *puc;
- struct siginfo info;
- struct ucontext uc;
- unsigned char retcode[8]; /* Trampoline code. */
-};
-
-void do_signal(int restart, struct pt_regs *regs);
-void keep_debug_flags(unsigned long oldccs, unsigned long oldspc,
- struct pt_regs *regs);
-
-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 registers from &sc->regs. sc is already checked
- * for VERIFY_READ since the signal_frame was previously
- * checked in sys_sigreturn().
- */
- if (__copy_from_user(regs, sc, sizeof(struct pt_regs)))
- goto badframe;
-
- /* Make that the user-mode flag is set. */
- regs->ccs |= (1 << (U_CCS_BITNR + CCS_SHIFT));
-
- /* Don't perform syscall restarting */
- regs->exs = -1;
-
- /* Restore the old USP. */
- err |= __get_user(old_usp, &sc->usp);
- wrusp(old_usp);
-
- return err;
-
-badframe:
- return 1;
-}
-
-asmlinkage int sys_sigreturn(void)
-{
- struct pt_regs *regs = current_pt_regs();
- sigset_t set;
- struct signal_frame __user *frame;
- unsigned long oldspc = regs->spc;
- unsigned long oldccs = regs->ccs;
-
- frame = (struct signal_frame *) rdusp();
-
- /*
- * Since the signal is stacked on a dword boundary, the frame
- * should be dword aligned here as well. It it's not, then the
- * user is trying some funny business.
- */
- 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;
-
- keep_debug_flags(oldccs, oldspc, regs);
-
- return regs->r10;
-
-badframe:
- force_sig(SIGSEGV, current);
- return 0;
-}
-
-asmlinkage int sys_rt_sigreturn(void)
-{
- struct pt_regs *regs = current_pt_regs();
- sigset_t set;
- struct rt_signal_frame __user *frame;
- unsigned long oldspc = regs->spc;
- unsigned long oldccs = regs->ccs;
-
- frame = (struct rt_signal_frame *) rdusp();
-
- /*
- * Since the signal is stacked on a dword boundary, the frame
- * should be dword aligned here as well. It it's not, then the
- * user is trying some funny business.
- */
- 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;
-
- keep_debug_flags(oldccs, oldspc, regs);
-
- return regs->r10;
-
-badframe:
- force_sig(SIGSEGV, current);
- return 0;
-}
-
-/* Setup a signal frame. */
-static int
-setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
- unsigned long mask)
-{
- int err;
- unsigned long usp;
-
- err = 0;
- usp = rdusp();
-
- /*
- * Copy the registers. They are located first in sc, so it's
- * possible to use sc directly.
- */
- err |= __copy_to_user(sc, regs, sizeof(struct pt_regs));
-
- err |= __put_user(mask, &sc->oldmask);
- err |= __put_user(usp, &sc->usp);
-
- return err;
-}
-
-/* Figure out where 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 a lot of state-info is stacked, and arranged for the
- * user-mode program to return to the kernel using either a trampiline
- * 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)
-{
- int err;
- unsigned long return_ip;
- struct signal_frame __user *frame;
-
- 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 user-space. If provided, use a stub
- * already located in user-space.
- */
- if (ksig->ka.sa.sa_flags & SA_RESTORER) {
- return_ip = (unsigned long)ksig->ka.sa.sa_restorer;
- } else {
- /* Trampoline - the desired return ip is in the signal return page. */
- return_ip = cris_signal_return_page;
-
- /*
- * This is movu.w __NR_sigreturn, r9; break 13;
- *
- * WE DO NOT USE IT ANY MORE! It's only left here for historical
- * reasons and because gdb uses it as a signature to notice
- * signal handler stack frames.
- */
- 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.
- *
- * Where the code enters now.
- * Where the code enter later.
- * First argument, signo.
- */
- regs->erp = (unsigned long) ksig->ka.sa.sa_handler;
- regs->srp = return_ip;
- regs->r10 = ksig->sig;
-
- /* 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)
-{
- int err;
- unsigned long return_ip;
- struct rt_signal_frame __user *frame;
-
- 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 user-space. If provided, use a stub
- * already located in user-space.
- */
- if (ksig->ka.sa.sa_flags & SA_RESTORER) {
- return_ip = (unsigned long) ksig->ka.sa.sa_restorer;
- } else {
- /* Trampoline - the desired return ip is in the signal return page. */
- return_ip = cris_signal_return_page + 6;
-
- /*
- * This is movu.w __NR_rt_sigreturn, r9; break 13;
- *
- * WE DO NOT USE IT ANY MORE! It's only left here for historical
- * reasons and because gdb uses it as a signature to notice
- * signal handler stack frames.
- */
- 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.
- *
- * Where the code enters now.
- * Where the code enters later.
- * First argument is signo.
- * Second argument is (siginfo_t *).
- * Third argument is unused.
- */
- regs->erp = (unsigned long) ksig->ka.sa.sa_handler;
- regs->srp = return_ip;
- regs->r10 = ksig->sig;
- regs->r11 = (unsigned long) &frame->info;
- regs->r12 = 0;
-
- /* Actually move the usp to reflect the stacked frame. */
- wrusp((unsigned long)frame);
-
- return 0;
-}
-
-/* Invoke a signal handler to, well, handle the signal. */
-static inline void
-handle_signal(int canrestart, struct ksignal *ksig, struct pt_regs *regs)
-{
- sigset_t *oldset = sigmask_to_save();
- int ret;
-
- /* Check if this got called from a system call. */
- if (canrestart) {
- /* If so, check system call restarting. */
- switch (regs->r10) {
- case -ERESTART_RESTARTBLOCK:
- case -ERESTARTNOHAND:
- /*
- * This means that the syscall should
- * only be restarted if there was no
- * handler for the signal, and since
- * this point isn't reached unless
- * there is a handler, there's no need
- * to restart.
- */
- regs->r10 = -EINTR;
- break;
-
- case -ERESTARTSYS:
- /*
- * This means 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;
- }
-
- /* Fall through. */
-
- case -ERESTARTNOINTR:
- /*
- * This means that the syscall should
- * be called again after the signal
- * handler returns.
- */
- RESTART_CRIS_SYS(regs);
- break;
- }
- }
-
- /* 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;
-
- canrestart = canrestart && ((int)regs->exs >= 0);
-
- /*
- * The common case should go fast, which is why this point is
- * reached from kernel-mode. If that's the case, just return
- * without doing anything.
- */
- if (!user_mode(regs))
- return;
-
- if (get_signal(&ksig)) {
- /* Whee! Actually deliver the signal. */
- handle_signal(canrestart, &ksig, regs);
- return;
- }
-
- /* Got here 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->erp -= 2;
- }
- }
-
- /* if there's no signal to deliver, we just put the saved sigmask
- * back */
- restore_saved_sigmask();
-}
-
-asmlinkage void
-ugdb_trap_user(struct thread_info *ti, int sig)
-{
- if (((user_regs(ti)->exs & 0xff00) >> 8) != SINGLE_STEP_INTR_VECT) {
- /* Zero single-step PC if the reason we stopped wasn't a single
- step exception. This is to avoid relying on it when it isn't
- reliable. */
- user_regs(ti)->spc = 0;
- }
- /* FIXME: Filter out false h/w breakpoint hits (i.e. EDA
- not within any configured h/w breakpoint range). Synchronize with
- what already exists for kernel debugging. */
- if (((user_regs(ti)->exs & 0xff00) >> 8) == BREAK_8_INTR_VECT) {
- /* Break 8: subtract 2 from ERP unless in a delay slot. */
- if (!(user_regs(ti)->erp & 0x1))
- user_regs(ti)->erp -= 2;
- }
- sys_kill(ti->task->pid, sig);
-}
-
-void
-keep_debug_flags(unsigned long oldccs, unsigned long oldspc,
- struct pt_regs *regs)
-{
- if (oldccs & (1 << Q_CCS_BITNR)) {
- /* Pending single step due to single-stepping the break 13
- in the signal trampoline: keep the Q flag. */
- regs->ccs |= (1 << Q_CCS_BITNR);
- /* S flag should be set - complain if it's not. */
- if (!(oldccs & (1 << (S_CCS_BITNR + CCS_SHIFT)))) {
- printk("Q flag but no S flag?");
- }
- regs->ccs |= (1 << (S_CCS_BITNR + CCS_SHIFT));
- /* Assume the SPC is valid and interesting. */
- regs->spc = oldspc;
-
- } else if (oldccs & (1 << (S_CCS_BITNR + CCS_SHIFT))) {
- /* If a h/w bp was set in the signal handler we need
- to keep the S flag. */
- regs->ccs |= (1 << (S_CCS_BITNR + CCS_SHIFT));
- /* Don't keep the old SPC though; if we got here due to
- a single-step, the Q flag should have been set. */
- } else if (regs->spc) {
- /* If we were single-stepping *before* the signal was taken,
- we don't want to restore that state now, because GDB will
- have forgotten all about it. */
- regs->spc = 0;
- regs->ccs &= ~(1 << (S_CCS_BITNR + CCS_SHIFT));
- }
-}
-
-/* Set up the trampolines on the signal return page. */
-int __init
-cris_init_signal(void)
-{
- u16* data = kmalloc(PAGE_SIZE, GFP_KERNEL);
-
- /* This is movu.w __NR_sigreturn, r9; break 13; */
- data[0] = 0x9c5f;
- data[1] = __NR_sigreturn;
- data[2] = 0xe93d;
- /* This is movu.w __NR_rt_sigreturn, r9; break 13; */
- data[3] = 0x9c5f;
- data[4] = __NR_rt_sigreturn;
- data[5] = 0xe93d;
-
- /* Map to userspace with appropriate permissions (no write access...) */
- cris_signal_return_page = (unsigned long)
- __ioremap_prot(virt_to_phys(data), PAGE_SIZE, PAGE_SIGNAL_TRAMPOLINE);
-
- return 0;
-}
-
-__initcall(cris_init_signal);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 01:11:07 +0100