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-rw-r--r--arch/tile/kernel/signal.c411
1 files changed, 0 insertions, 411 deletions
diff --git a/arch/tile/kernel/signal.c b/arch/tile/kernel/signal.c
deleted file mode 100644
index f2bf557bb005..000000000000
--- a/arch/tile/kernel/signal.c
+++ /dev/null
@@ -1,411 +0,0 @@
-/*
- * Copyright (C) 1991, 1992 Linus Torvalds
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- */
-
-#include <linux/sched.h>
-#include <linux/sched/debug.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/unistd.h>
-#include <linux/stddef.h>
-#include <linux/personality.h>
-#include <linux/suspend.h>
-#include <linux/ptrace.h>
-#include <linux/elf.h>
-#include <linux/compat.h>
-#include <linux/syscalls.h>
-#include <linux/uaccess.h>
-#include <asm/processor.h>
-#include <asm/ucontext.h>
-#include <asm/sigframe.h>
-#include <asm/syscalls.h>
-#include <asm/vdso.h>
-#include <arch/interrupts.h>
-
-#define DEBUG_SIG 0
-
-/*
- * Do a signal return; undo the signal stack.
- */
-
-int restore_sigcontext(struct pt_regs *regs,
- struct sigcontext __user *sc)
-{
- int err;
-
- /* Always make any pending restarted system calls return -EINTR */
- current->restart_block.fn = do_no_restart_syscall;
-
- /*
- * Enforce that sigcontext is like pt_regs, and doesn't mess
- * up our stack alignment rules.
- */
- BUILD_BUG_ON(sizeof(struct sigcontext) != sizeof(struct pt_regs));
- BUILD_BUG_ON(sizeof(struct sigcontext) % 8 != 0);
- err = __copy_from_user(regs, sc, sizeof(*regs));
-
- /* Ensure that the PL is always set to USER_PL. */
- regs->ex1 = PL_ICS_EX1(USER_PL, EX1_ICS(regs->ex1));
-
- regs->faultnum = INT_SWINT_1_SIGRETURN;
-
- return err;
-}
-
-void signal_fault(const char *type, struct pt_regs *regs,
- void __user *frame, int sig)
-{
- trace_unhandled_signal(type, regs, (unsigned long)frame, SIGSEGV);
- force_sigsegv(sig, current);
-}
-
-/* The assembly shim for this function arranges to ignore the return value. */
-SYSCALL_DEFINE0(rt_sigreturn)
-{
- struct pt_regs *regs = current_pt_regs();
- struct rt_sigframe __user *frame =
- (struct rt_sigframe __user *)(regs->sp);
- sigset_t set;
-
- 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 0;
-
-badframe:
- signal_fault("bad sigreturn frame", regs, frame, 0);
- return 0;
-}
-
-/*
- * Set up a signal frame.
- */
-
-int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
-{
- return __copy_to_user(sc, regs, sizeof(*regs));
-}
-
-/*
- * Determine which stack to use..
- */
-static inline void __user *get_sigframe(struct k_sigaction *ka,
- struct pt_regs *regs,
- size_t frame_size)
-{
- unsigned long sp;
-
- /* Default to using normal stack */
- sp = regs->sp;
-
- /*
- * If we are on the alternate signal stack and would overflow
- * it, don't. Return an always-bogus address instead so we
- * will die with SIGSEGV.
- */
- if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
- return (void __user __force *)-1UL;
-
- /* This is the X/Open sanctioned signal stack switching. */
- if (ka->sa.sa_flags & SA_ONSTACK) {
- if (sas_ss_flags(sp) == 0)
- sp = current->sas_ss_sp + current->sas_ss_size;
- }
-
- sp -= frame_size;
- /*
- * Align the stack pointer according to the TILE ABI,
- * i.e. so that on function entry (sp & 15) == 0.
- */
- sp &= -16UL;
- return (void __user *) sp;
-}
-
-static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
- struct pt_regs *regs)
-{
- unsigned long restorer;
- struct rt_sigframe __user *frame;
- int err = 0, sig = ksig->sig;
-
- frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto err;
-
- /* Always write at least the signal number for the stack backtracer. */
- if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
- /* At sigreturn time, restore the callee-save registers too. */
- err |= copy_siginfo_to_user(&frame->info, &ksig->info);
- regs->flags |= PT_FLAGS_RESTORE_REGS;
- } else {
- err |= __put_user(ksig->info.si_signo, &frame->info.si_signo);
- }
-
- /* Create the ucontext. */
- err |= __clear_user(&frame->save_area, sizeof(frame->save_area));
- err |= __put_user(0, &frame->uc.uc_flags);
- err |= __put_user(NULL, &frame->uc.uc_link);
- err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
- err |= setup_sigcontext(&frame->uc.uc_mcontext, regs);
- err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
- if (err)
- goto err;
-
- restorer = VDSO_SYM(&__vdso_rt_sigreturn);
- if (ksig->ka.sa.sa_flags & SA_RESTORER)
- restorer = (unsigned long) ksig->ka.sa.sa_restorer;
-
- /*
- * Set up registers for signal handler.
- * Registers that we don't modify keep the value they had from
- * user-space at the time we took the signal.
- * We always pass siginfo and mcontext, regardless of SA_SIGINFO,
- * since some things rely on this (e.g. glibc's debug/segfault.c).
- */
- regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
- regs->ex1 = PL_ICS_EX1(USER_PL, 1); /* set crit sec in handler */
- regs->sp = (unsigned long) frame;
- regs->lr = restorer;
- regs->regs[0] = (unsigned long) sig;
- regs->regs[1] = (unsigned long) &frame->info;
- regs->regs[2] = (unsigned long) &frame->uc;
- regs->flags |= PT_FLAGS_CALLER_SAVES;
- return 0;
-
-err:
- trace_unhandled_signal("bad sigreturn frame", regs,
- (unsigned long)frame, SIGSEGV);
- return -EFAULT;
-}
-
-/*
- * OK, we're invoking a handler
- */
-
-static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
-{
- sigset_t *oldset = sigmask_to_save();
- int ret;
-
- /* Are we from a system call? */
- if (regs->faultnum == INT_SWINT_1) {
- /* If so, check system call restarting.. */
- switch (regs->regs[0]) {
- case -ERESTART_RESTARTBLOCK:
- case -ERESTARTNOHAND:
- regs->regs[0] = -EINTR;
- break;
-
- case -ERESTARTSYS:
- if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
- regs->regs[0] = -EINTR;
- break;
- }
- /* fallthrough */
- case -ERESTARTNOINTR:
- /* Reload caller-saves to restore r0..r5 and r10. */
- regs->flags |= PT_FLAGS_CALLER_SAVES;
- regs->regs[0] = regs->orig_r0;
- regs->pc -= 8;
- }
- }
-
- /* Set up the stack frame */
-#ifdef CONFIG_COMPAT
- if (is_compat_task())
- ret = compat_setup_rt_frame(ksig, oldset, regs);
- else
-#endif
- ret = setup_rt_frame(ksig, oldset, regs);
-
- signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
-}
-
-/*
- * 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.
- */
-void do_signal(struct pt_regs *regs)
-{
- struct ksignal ksig;
-
- /*
- * i386 will check if we're coming from kernel mode and bail out
- * here. In my experience this just turns weird crashes into
- * weird spin-hangs. But if we find a case where this seems
- * helpful, we can reinstate the check on "!user_mode(regs)".
- */
-
- if (get_signal(&ksig)) {
- /* Whee! Actually deliver the signal. */
- handle_signal(&ksig, regs);
- goto done;
- }
-
- /* Did we come from a system call? */
- if (regs->faultnum == INT_SWINT_1) {
- /* Restart the system call - no handlers present */
- switch (regs->regs[0]) {
- case -ERESTARTNOHAND:
- case -ERESTARTSYS:
- case -ERESTARTNOINTR:
- regs->flags |= PT_FLAGS_CALLER_SAVES;
- regs->regs[0] = regs->orig_r0;
- regs->pc -= 8;
- break;
-
- case -ERESTART_RESTARTBLOCK:
- regs->flags |= PT_FLAGS_CALLER_SAVES;
- regs->regs[TREG_SYSCALL_NR] = __NR_restart_syscall;
- regs->pc -= 8;
- break;
- }
- }
-
- /* If there's no signal to deliver, just put the saved sigmask back. */
- restore_saved_sigmask();
-
-done:
- /* Avoid double syscall restart if there are nested signals. */
- regs->faultnum = INT_SWINT_1_SIGRETURN;
-}
-
-int show_unhandled_signals = 1;
-
-static int __init crashinfo(char *str)
-{
- const char *word;
-
- if (*str == '\0')
- show_unhandled_signals = 2;
- else if (*str != '=' || kstrtoint(++str, 0, &show_unhandled_signals) != 0)
- return 0;
-
- switch (show_unhandled_signals) {
- case 0:
- word = "No";
- break;
- case 1:
- word = "One-line";
- break;
- default:
- word = "Detailed";
- break;
- }
- pr_info("%s crash reports will be generated on the console\n", word);
- return 1;
-}
-__setup("crashinfo", crashinfo);
-
-static void dump_mem(void __user *address)
-{
- void __user *addr;
- enum { region_size = 256, bytes_per_line = 16 };
- int i, j, k;
- int found_readable_mem = 0;
-
- if (!access_ok(VERIFY_READ, address, 1)) {
- pr_err("Not dumping at address 0x%lx (kernel address)\n",
- (unsigned long)address);
- return;
- }
-
- addr = (void __user *)
- (((unsigned long)address & -bytes_per_line) - region_size/2);
- if (addr > address)
- addr = NULL;
- for (i = 0; i < region_size;
- addr += bytes_per_line, i += bytes_per_line) {
- unsigned char buf[bytes_per_line];
- char line[100];
- if (copy_from_user(buf, addr, bytes_per_line))
- continue;
- if (!found_readable_mem) {
- pr_err("Dumping memory around address 0x%lx:\n",
- (unsigned long)address);
- found_readable_mem = 1;
- }
- j = sprintf(line, REGFMT ":", (unsigned long)addr);
- for (k = 0; k < bytes_per_line; ++k)
- j += sprintf(&line[j], " %02x", buf[k]);
- pr_err("%s\n", line);
- }
- if (!found_readable_mem)
- pr_err("No readable memory around address 0x%lx\n",
- (unsigned long)address);
-}
-
-void trace_unhandled_signal(const char *type, struct pt_regs *regs,
- unsigned long address, int sig)
-{
- struct task_struct *tsk = current;
-
- if (show_unhandled_signals == 0)
- return;
-
- /* If the signal is handled, don't show it here. */
- if (!is_global_init(tsk)) {
- void __user *handler =
- tsk->sighand->action[sig-1].sa.sa_handler;
- if (handler != SIG_IGN && handler != SIG_DFL)
- return;
- }
-
- /* Rate-limit the one-line output, not the detailed output. */
- if (show_unhandled_signals <= 1 && !printk_ratelimit())
- return;
-
- printk("%s%s[%d]: %s at %lx pc "REGFMT" signal %d",
- task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
- tsk->comm, task_pid_nr(tsk), type, address, regs->pc, sig);
-
- print_vma_addr(KERN_CONT " in ", regs->pc);
-
- printk(KERN_CONT "\n");
-
- if (show_unhandled_signals > 1) {
- switch (sig) {
- case SIGILL:
- case SIGFPE:
- case SIGSEGV:
- case SIGBUS:
- pr_err("User crash: signal %d, trap %ld, address 0x%lx\n",
- sig, regs->faultnum, address);
- show_regs(regs);
- dump_mem((void __user *)address);
- break;
- default:
- pr_err("User crash: signal %d, trap %ld\n",
- sig, regs->faultnum);
- break;
- }
- }
-}
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