void
StackOverflow(struct pt_regs *regs)
{
printk(KERN_CRIT "Kernel stack overflow in process %p, r1=%lx\n",
current, regs->gpr[1]);
#if defined(CONFIG_XMON) || defined(CONFIG_KGDB)
debugger(regs);
#endif
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
instruction_dump((unsigned long *)regs->nip);
panic("kernel stack overflow");
}
void
_exception(int signr, struct pt_regs *regs)
{
if (!user_mode(regs))
{
show_regs(regs);
#if defined(CONFIG_XMON) || defined(CONFIG_KGDB)
debugger(regs);
#endif
print_backtrace((unsigned long *)regs->gpr[1]);
instruction_dump((unsigned long *)regs->nip);
panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
}
force_sig(signr, current);
}
void
MachineCheckException(struct pt_regs *regs)
{
if ( !user_mode(regs) )
{
#ifdef CONFIG_MBX
/* the mbx pci read routines can cause machine checks -- Cort */
bad_page_fault(regs,regs->dar);
return;
#endif /* CONFIG_MBX */
#if defined(CONFIG_XMON) || defined(CONFIG_KGDB)
if (debugger_fault_handler) {
debugger_fault_handler(regs);
return;
}
#endif
printk("Machine check in kernel mode.\n");
printk("Caused by (from msr): ");
printk("regs %p ",regs);
switch( regs->msr & 0x0000F000)
{
case (1<<12) :
printk("Machine check signal - probably due to mm fault\n"
"with mmu off\n");
break;
case (1<<13) :
printk("Transfer error ack signal\n");
break;
case (1<<14) :
printk("Data parity signal\n");
break;
case (1<<15) :
printk("Address parity signal\n");
break;
default:
printk("Unknown values in msr\n");
}
show_regs(regs);
#if defined(CONFIG_XMON) || defined(CONFIG_KGDB)
debugger(regs);
#endif
print_backtrace((unsigned long *)regs->gpr[1]);
instruction_dump((unsigned long *)regs->nip);
panic("machine check");
}
_exception(SIGSEGV, regs);
}
void die_if_kernel(char *str, struct pt_regs *regs)
{
int count = 0;
/* Amuse the user. */
printk(
" \\|/ ____ \\|/\n"
" \"@'/ ,. \\`@\"\n"
" /_| \\__/ |_\\\n"
" \\__U_/\n");
printk("%s(%d): %s\n", current->comm, current->pid, str);
show_regs(regs);
__SAVE; __SAVE; __SAVE; __SAVE;
__SAVE; __SAVE; __SAVE; __SAVE;
__RESTORE; __RESTORE; __RESTORE; __RESTORE;
__RESTORE; __RESTORE; __RESTORE; __RESTORE;
{
struct reg_window *rw = (struct reg_window *)regs->u_regs[UREG_FP];
/* Stop the back trace when we hit userland or we
* find some badly aligned kernel stack. Set an upper
* bound in case our stack is trashed and we loop.
*/
while(rw &&
count++ < 30 &&
(((unsigned long) rw) >= PAGE_OFFSET) &&
!(((unsigned long) rw) & 0x7)) {
printk("Caller[%08lx]\n", rw->ins[7]);
rw = (struct reg_window *)rw->ins[6];
}
}
printk("Instruction DUMP:");
instruction_dump ((unsigned long *) regs->pc);
if(regs->psr & PSR_PS)
do_exit(SIGKILL);
do_exit(SIGSEGV);
}
void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
siginfo_t info;
if(regs->psr & PSR_PS) {
printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
regs->u_regs[UREG_RETPC]);
die_if_kernel("BOGUS", regs);
/* die_if_kernel("Kernel MNA access", regs); */
}
#if 0
show_regs (regs);
instruction_dump ((unsigned long *) regs->pc);
printk ("do_MNA!\n");
#endif
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = BUS_ADRALN;
info.si_addr = /* FIXME: Should dig out mna address */ (void *)0;
info.si_trapno = 0;
send_sig_info(SIGBUS, &info, current);
}
