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microblaze_mmu_v2: Add MMU related exceptions handling 

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2009-05-26 16:30:24 +02:00
parent 0d6de95326
commit 4bb73c3de7
1 changed files with 37 additions and 8 deletions
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45
arch/microblaze/kernel/exceptions.c
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@ -21,9 +21,9 @@
#include <asm/exceptions.h>
#include <asm/entry.h> /* For KM CPU var */
#include <asm/uaccess.h>
#include <asm/errno.h>
#include <asm/ptrace.h>
#include <linux/uaccess.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <asm/current.h>
#define MICROBLAZE_ILL_OPCODE_EXCEPTION 0x02
@ -31,7 +31,7 @@
#define MICROBLAZE_DBUS_EXCEPTION 0x04
#define MICROBLAZE_DIV_ZERO_EXCEPTION 0x05
#define MICROBLAZE_FPU_EXCEPTION 0x06
#define MICROBLAZE_PRIVILEG_EXCEPTION 0x07
#define MICROBLAZE_PRIVILEGED_EXCEPTION 0x07
static DEFINE_SPINLOCK(die_lock);
@ -66,6 +66,11 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
int fsr, int addr)
{
#ifdef CONFIG_MMU
int code;
addr = regs->pc;
#endif
#if 0
printk(KERN_WARNING "Exception %02x in %s mode, FSR=%08x PC=%08x ESR=%08x\n",
type, user_mode(regs) ? "user" : "kernel", fsr,
@ -74,7 +79,13 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
switch (type & 0x1F) {
case MICROBLAZE_ILL_OPCODE_EXCEPTION:
_exception(SIGILL, regs, ILL_ILLOPC, addr);
if (user_mode(regs)) {
printk(KERN_WARNING "Illegal opcode exception in user mode.\n");
_exception(SIGILL, regs, ILL_ILLOPC, addr);
return;
}
printk(KERN_WARNING "Illegal opcode exception in kernel mode.\n");
die("opcode exception", regs, SIGBUS);
break;
case MICROBLAZE_IBUS_EXCEPTION:
if (user_mode(regs)) {
@ -95,11 +106,16 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
die("bus exception", regs, SIGBUS);
break;
case MICROBLAZE_DIV_ZERO_EXCEPTION:
printk(KERN_WARNING "Divide by zero exception\n");
_exception(SIGILL, regs, ILL_ILLOPC, addr);
if (user_mode(regs)) {
printk(KERN_WARNING "Divide by zero exception in user mode\n");
_exception(SIGILL, regs, ILL_ILLOPC, addr);
return;
}
printk(KERN_WARNING "Divide by zero exception in kernel mode.\n");
die("Divide by exception", regs, SIGBUS);
break;
case MICROBLAZE_FPU_EXCEPTION:
printk(KERN_WARNING "FPU exception\n");
/* IEEE FP exception */
/* I removed fsr variable and use code var for storing fsr */
if (fsr & FSR_IO)
@ -115,7 +131,20 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
_exception(SIGFPE, regs, fsr, addr);
break;
#ifdef CONFIG_MMU
case MICROBLAZE_PRIVILEGED_EXCEPTION:
printk(KERN_WARNING "Privileged exception\n");
/* "brk r0,r0" - used as debug breakpoint */
if (get_user(code, (unsigned long *)regs->pc) == 0
&& code == 0x980c0000) {
_exception(SIGTRAP, regs, TRAP_BRKPT, addr);
} else {
_exception(SIGILL, regs, ILL_PRVOPC, addr);
}
break;
#endif
default:
/* FIXME what to do in unexpected exception */
printk(KERN_WARNING "Unexpected exception %02x "
"PC=%08x in %s mode\n", type, (unsigned int) addr,
kernel_mode(regs) ? "kernel" : "user");