376 lines
8.8 KiB
C
376 lines
8.8 KiB
C
/*
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* linux/arch/m68knommu/kernel/traps.c
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*
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* Copyright (C) 1993, 1994 by Hamish Macdonald
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*
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* 68040 fixes by Michael Rausch
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* 68040 fixes by Martin Apel
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* 68060 fixes by Roman Hodek
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* 68060 fixes by Jesper Skov
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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/*
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* Sets up all exception vectors
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*/
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#include <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/user.h>
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#include <linux/string.h>
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <linux/ptrace.h>
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#include <linux/kallsyms.h>
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#include <asm/setup.h>
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#include <asm/fpu.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/traps.h>
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#include <asm/pgtable.h>
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#include <asm/machdep.h>
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#include <asm/siginfo.h>
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static char const * const vec_names[] = {
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"RESET SP", "RESET PC", "BUS ERROR", "ADDRESS ERROR",
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"ILLEGAL INSTRUCTION", "ZERO DIVIDE", "CHK", "TRAPcc",
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"PRIVILEGE VIOLATION", "TRACE", "LINE 1010", "LINE 1111",
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"UNASSIGNED RESERVED 12", "COPROCESSOR PROTOCOL VIOLATION",
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"FORMAT ERROR", "UNINITIALIZED INTERRUPT",
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"UNASSIGNED RESERVED 16", "UNASSIGNED RESERVED 17",
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"UNASSIGNED RESERVED 18", "UNASSIGNED RESERVED 19",
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"UNASSIGNED RESERVED 20", "UNASSIGNED RESERVED 21",
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"UNASSIGNED RESERVED 22", "UNASSIGNED RESERVED 23",
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"SPURIOUS INTERRUPT", "LEVEL 1 INT", "LEVEL 2 INT", "LEVEL 3 INT",
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"LEVEL 4 INT", "LEVEL 5 INT", "LEVEL 6 INT", "LEVEL 7 INT",
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"SYSCALL", "TRAP #1", "TRAP #2", "TRAP #3",
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"TRAP #4", "TRAP #5", "TRAP #6", "TRAP #7",
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"TRAP #8", "TRAP #9", "TRAP #10", "TRAP #11",
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"TRAP #12", "TRAP #13", "TRAP #14", "TRAP #15",
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"FPCP BSUN", "FPCP INEXACT", "FPCP DIV BY 0", "FPCP UNDERFLOW",
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"FPCP OPERAND ERROR", "FPCP OVERFLOW", "FPCP SNAN",
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"FPCP UNSUPPORTED OPERATION",
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"MMU CONFIGURATION ERROR"
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};
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void __init trap_init(void)
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{
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}
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void die_if_kernel(char *str, struct pt_regs *fp, int nr)
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{
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if (!(fp->sr & PS_S))
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return;
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console_verbose();
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printk(KERN_EMERG "%s: %08x\n",str,nr);
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printk(KERN_EMERG "PC: [<%08lx>]\nSR: %04x SP: %p a2: %08lx\n",
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fp->pc, fp->sr, fp, fp->a2);
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printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
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fp->d0, fp->d1, fp->d2, fp->d3);
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printk(KERN_EMERG "d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
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fp->d4, fp->d5, fp->a0, fp->a1);
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printk(KERN_EMERG "Process %s (pid: %d, stackpage=%08lx)\n",
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current->comm, current->pid, PAGE_SIZE+(unsigned long)current);
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show_stack(NULL, (unsigned long *)(fp + 1));
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add_taint(TAINT_DIE);
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do_exit(SIGSEGV);
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}
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asmlinkage void buserr_c(struct frame *fp)
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{
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/* Only set esp0 if coming from user mode */
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if (user_mode(&fp->ptregs))
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current->thread.esp0 = (unsigned long) fp;
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#if defined(DEBUG)
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printk (KERN_DEBUG "*** Bus Error *** Format is %x\n", fp->ptregs.format);
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#endif
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die_if_kernel("bad frame format",&fp->ptregs,0);
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#if defined(DEBUG)
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printk(KERN_DEBUG "Unknown SIGSEGV - 4\n");
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#endif
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force_sig(SIGSEGV, current);
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}
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static void print_this_address(unsigned long addr, int i)
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{
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#ifdef CONFIG_KALLSYMS
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printk(KERN_EMERG " [%08lx] ", addr);
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print_symbol(KERN_CONT "%s\n", addr);
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#else
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if (i % 5)
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printk(KERN_CONT " [%08lx] ", addr);
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else
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printk(KERN_EMERG " [%08lx] ", addr);
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i++;
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#endif
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}
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int kstack_depth_to_print = 48;
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static void __show_stack(struct task_struct *task, unsigned long *stack)
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{
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unsigned long *endstack, addr;
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#ifdef CONFIG_FRAME_POINTER
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unsigned long *last_stack;
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#endif
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int i;
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if (!stack)
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stack = (unsigned long *)task->thread.ksp;
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addr = (unsigned long) stack;
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endstack = (unsigned long *) PAGE_ALIGN(addr);
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printk(KERN_EMERG "Stack from %08lx:", (unsigned long)stack);
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for (i = 0; i < kstack_depth_to_print; i++) {
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if (stack + 1 + i > endstack)
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break;
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if (i % 8 == 0)
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printk(KERN_EMERG " ");
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printk(KERN_CONT " %08lx", *(stack + i));
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}
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printk("\n");
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i = 0;
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#ifdef CONFIG_FRAME_POINTER
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printk(KERN_EMERG "Call Trace:\n");
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last_stack = stack - 1;
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while (stack <= endstack && stack > last_stack) {
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addr = *(stack + 1);
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print_this_address(addr, i);
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i++;
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last_stack = stack;
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stack = (unsigned long *)*stack;
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}
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printk("\n");
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#else
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printk(KERN_EMERG "Call Trace with CONFIG_FRAME_POINTER disabled:\n");
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while (stack <= endstack) {
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addr = *stack++;
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/*
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* If the address is either in the text segment of the kernel,
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* or in a region which is occupied by a module then it *may*
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* be the address of a calling routine; if so, print it so that
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* someone tracing down the cause of the crash will be able to
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* figure out the call path that was taken.
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*/
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if (__kernel_text_address(addr)) {
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print_this_address(addr, i);
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i++;
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}
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}
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printk(KERN_CONT "\n");
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#endif
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}
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void bad_super_trap(struct frame *fp)
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{
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console_verbose();
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if (fp->ptregs.vector < 4 * ARRAY_SIZE(vec_names))
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printk (KERN_WARNING "*** %s *** FORMAT=%X\n",
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vec_names[(fp->ptregs.vector) >> 2],
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fp->ptregs.format);
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else
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printk (KERN_WARNING "*** Exception %d *** FORMAT=%X\n",
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(fp->ptregs.vector) >> 2,
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fp->ptregs.format);
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printk (KERN_WARNING "Current process id is %d\n", current->pid);
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die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
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}
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asmlinkage void trap_c(struct frame *fp)
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{
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int sig;
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siginfo_t info;
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if (fp->ptregs.sr & PS_S) {
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if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
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/* traced a trapping instruction */
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} else
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bad_super_trap(fp);
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return;
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}
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/* send the appropriate signal to the user program */
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switch ((fp->ptregs.vector) >> 2) {
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case VEC_ADDRERR:
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info.si_code = BUS_ADRALN;
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sig = SIGBUS;
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break;
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case VEC_ILLEGAL:
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case VEC_LINE10:
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case VEC_LINE11:
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info.si_code = ILL_ILLOPC;
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sig = SIGILL;
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break;
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case VEC_PRIV:
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info.si_code = ILL_PRVOPC;
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sig = SIGILL;
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break;
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case VEC_COPROC:
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info.si_code = ILL_COPROC;
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sig = SIGILL;
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break;
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case VEC_TRAP1: /* gdbserver breakpoint */
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fp->ptregs.pc -= 2;
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info.si_code = TRAP_TRACE;
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sig = SIGTRAP;
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break;
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case VEC_TRAP2:
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case VEC_TRAP3:
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case VEC_TRAP4:
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case VEC_TRAP5:
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case VEC_TRAP6:
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case VEC_TRAP7:
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case VEC_TRAP8:
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case VEC_TRAP9:
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case VEC_TRAP10:
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case VEC_TRAP11:
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case VEC_TRAP12:
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case VEC_TRAP13:
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case VEC_TRAP14:
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info.si_code = ILL_ILLTRP;
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sig = SIGILL;
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break;
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case VEC_FPBRUC:
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case VEC_FPOE:
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case VEC_FPNAN:
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info.si_code = FPE_FLTINV;
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sig = SIGFPE;
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break;
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case VEC_FPIR:
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info.si_code = FPE_FLTRES;
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sig = SIGFPE;
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break;
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case VEC_FPDIVZ:
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info.si_code = FPE_FLTDIV;
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sig = SIGFPE;
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break;
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case VEC_FPUNDER:
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info.si_code = FPE_FLTUND;
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sig = SIGFPE;
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break;
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case VEC_FPOVER:
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info.si_code = FPE_FLTOVF;
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sig = SIGFPE;
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break;
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case VEC_ZERODIV:
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info.si_code = FPE_INTDIV;
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sig = SIGFPE;
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break;
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case VEC_CHK:
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case VEC_TRAP:
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info.si_code = FPE_INTOVF;
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sig = SIGFPE;
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break;
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case VEC_TRACE: /* ptrace single step */
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info.si_code = TRAP_TRACE;
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sig = SIGTRAP;
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break;
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case VEC_TRAP15: /* breakpoint */
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info.si_code = TRAP_BRKPT;
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sig = SIGTRAP;
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break;
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default:
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info.si_code = ILL_ILLOPC;
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sig = SIGILL;
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break;
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}
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info.si_signo = sig;
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info.si_errno = 0;
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switch (fp->ptregs.format) {
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default:
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info.si_addr = (void *) fp->ptregs.pc;
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break;
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case 2:
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info.si_addr = (void *) fp->un.fmt2.iaddr;
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break;
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case 7:
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info.si_addr = (void *) fp->un.fmt7.effaddr;
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break;
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case 9:
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info.si_addr = (void *) fp->un.fmt9.iaddr;
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break;
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case 10:
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info.si_addr = (void *) fp->un.fmta.daddr;
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break;
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case 11:
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info.si_addr = (void *) fp->un.fmtb.daddr;
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break;
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}
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force_sig_info (sig, &info, current);
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}
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asmlinkage void set_esp0(unsigned long ssp)
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{
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current->thread.esp0 = ssp;
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}
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/*
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* The architecture-independent backtrace generator
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*/
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void dump_stack(void)
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{
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/*
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* We need frame pointers for this little trick, which works as follows:
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*
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* +------------+ 0x00
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* | Next SP | -> 0x0c
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* +------------+ 0x04
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* | Caller |
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* +------------+ 0x08
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* | Local vars | -> our stack var
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* +------------+ 0x0c
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* | Next SP | -> 0x18, that is what we pass to show_stack()
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* +------------+ 0x10
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* | Caller |
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* +------------+ 0x14
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* | Local vars |
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* +------------+ 0x18
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* | ... |
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* +------------+
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*/
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unsigned long *stack;
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stack = (unsigned long *)&stack;
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stack++;
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__show_stack(current, stack);
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}
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EXPORT_SYMBOL(dump_stack);
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void show_stack(struct task_struct *task, unsigned long *stack)
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{
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if (!stack && !task)
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dump_stack();
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else
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__show_stack(task, stack);
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}
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#ifdef CONFIG_M68KFPU_EMU
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asmlinkage void fpemu_signal(int signal, int code, void *addr)
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{
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siginfo_t info;
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info.si_signo = signal;
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info.si_errno = 0;
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info.si_code = code;
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info.si_addr = addr;
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force_sig_info(signal, &info, current);
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}
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#endif
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