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linux/arch/m68k/kernel/traps_no.c
Greg Ungerer 66d857b08b m68k: merge m68k and m68knommu arch directories 
There is a lot of common code that could be shared between the m68k
and m68knommu arch branches. It makes sense to merge the two branches
into a single directory structure so that we can more easily share
that common code.

This is a brute force merge, based on a script from Stephen King
<sfking@fdwdc.com>, which was originally written by Arnd Bergmann
<arnd@arndb.de>.

> The script was inspired by the script Sam Ravnborg used to merge the
> includes from m68knommu. For those files common to both arches but
> differing in content, the m68k version of the file is renamed to
> <file>_mm.<ext> and the m68knommu version of the file is moved into the
> corresponding m68k directory and renamed <file>_no.<ext> and a small
> wrapper file <file>.<ext> is used to select between the two version. Files
> that are common to both but don't differ are removed from the m68knommu
> tree and files and directories that are unique to the m68knommu tree are
> moved to the m68k tree. Finally, the arch/m68knommu tree is removed.
>
> To select between the the versions of the files, the wrapper uses
>
> #ifdef CONFIG_MMU
> #include <file>_mm.<ext>
> #else
> #include <file>_no.<ext>
> #endif

On top of this file merge I have done a simplistic merge of m68k and
m68knommu Kconfig, which primarily attempts to keep existing options and
menus in place. Other than a handful of options being moved it produces
identical .config outputs on m68k and m68knommu targets I tested it on.

With this in place there is now quite a bit of scope for merge cleanups
in future patches.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
2011-03-25 14:05:13 +10:00

366 lines
8.5 KiB
C
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/*
* 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/user.h>
#include <linux/string.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/ptrace.h>
#include <linux/kallsyms.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);
}
static void print_this_address(unsigned long addr, int i)
{
#ifdef CONFIG_KALLSYMS
printk(KERN_EMERG " [%08lx] ", addr);
print_symbol(KERN_CONT "%s\n", addr);
#else
if (i % 5)
printk(KERN_CONT " [%08lx] ", addr);
else
printk(KERN_EMERG " [%08lx] ", addr);
i++;
#endif
}
int kstack_depth_to_print = 48;
static void __show_stack(struct task_struct *task, unsigned long *stack)
{
unsigned long *endstack, addr;
#ifdef CONFIG_FRAME_POINTER
unsigned long *last_stack;
#endif
int i;
if (!stack)
stack = (unsigned long *)task->thread.ksp;
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 + i > endstack)
break;
if (i % 8 == 0)
printk(KERN_EMERG " ");
printk(KERN_CONT " %08lx", *(stack + i));
}
printk("\n");
i = 0;
#ifdef CONFIG_FRAME_POINTER
printk(KERN_EMERG "Call Trace:\n");
last_stack = stack - 1;
while (stack <= endstack && stack > last_stack) {
addr = *(stack + 1);
print_this_address(addr, i);
i++;
last_stack = stack;
stack = (unsigned long *)*stack;
}
printk("\n");
#else
printk(KERN_EMERG "Call Trace with CONFIG_FRAME_POINTER disabled:\n");
while (stack <= endstack) {
addr = *stack++;
/*
* If the address is either in the text segment of the kernel,
* or in a region which is occupied by a module then 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 (__kernel_text_address(addr)) {
print_this_address(addr, i);
i++;
}
}
printk(KERN_CONT "\n");
#endif
}
void bad_super_trap(struct frame *fp)
{
int vector = (fp->ptregs.vector >> 2) & 0xff;
console_verbose();
if (vector < ARRAY_SIZE(vec_names))
printk (KERN_WARNING "*** %s *** FORMAT=%X\n",
vec_names[vector],
fp->ptregs.format);
else
printk (KERN_WARNING "*** Exception %d *** FORMAT=%X\n",
vector,
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;
int vector = (fp->ptregs.vector >> 2) & 0xff;
siginfo_t info;
if (fp->ptregs.sr & PS_S) {
if (vector == VEC_TRACE) {
/* traced a trapping instruction */
} else
bad_super_trap(fp);
return;
}
/* send the appropriate signal to the user program */
switch (vector) {
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)
{
/*
* We need frame pointers for this little trick, which works as follows:
*
* +------------+ 0x00
* | Next SP | -> 0x0c
* +------------+ 0x04
* | Caller |
* +------------+ 0x08
* | Local vars | -> our stack var
* +------------+ 0x0c
* | Next SP | -> 0x18, that is what we pass to show_stack()
* +------------+ 0x10
* | Caller |
* +------------+ 0x14
* | Local vars |
* +------------+ 0x18
* | ... |
* +------------+
*/
unsigned long *stack;
stack = (unsigned long *)&stack;
stack++;
__show_stack(current, stack);
}
EXPORT_SYMBOL(dump_stack);
void show_stack(struct task_struct *task, unsigned long *stack)
{
if (!stack && !task)
dump_stack();
else
__show_stack(task, stack);
}
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