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