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/*
* linux/arch/ppc/kernel/traps.c
*
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Modified by Cort Dougan (cort@cs.nmt.edu)
* and Paul Mackerras (paulus@cs.anu.edu.au)
*/
/*
* This file handles the architecture-dependent parts of hardware exceptions
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/malloc.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/interrupt.h>
#include <linux/config.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/processor.h>
extern int fix_alignment(struct pt_regs *);
extern void bad_page_fault(struct pt_regs *, unsigned long);
#ifdef CONFIG_XMON
extern int xmon_bpt(struct pt_regs *regs);
extern int xmon_sstep(struct pt_regs *regs);
extern void xmon(struct pt_regs *regs);
extern int xmon_iabr_match(struct pt_regs *regs);
extern void (*xmon_fault_handler)(struct pt_regs *regs);
#endif
/*
* Trap & Exception support
*/
void
trap_init(void)
{
}
void
_exception(int signr, struct pt_regs *regs)
{
if (!user_mode(regs))
{
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
#ifdef CONFIG_XMON
xmon(regs);
#endif
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_XMON
if (xmon_fault_handler) {
xmon_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);
print_backtrace((unsigned long *)regs->gpr[1]);
#ifdef CONFIG_XMON
xmon(regs);
#endif
panic("machine check");
}
_exception(SIGSEGV, regs);
}
void
UnknownException(struct pt_regs *regs)
{
printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
regs->nip, regs->msr, regs->trap);
_exception(SIGTRAP, regs);
}
void
InstructionBreakpoint(struct pt_regs *regs)
{
#ifdef CONFIG_XMON
if (xmon_iabr_match(regs))
return;
#endif
_exception(SIGTRAP, regs);
}
void
RunModeException(struct pt_regs *regs)
{
_exception(SIGTRAP, regs);
}
void
ProgramCheckException(struct pt_regs *regs)
{
if (regs->msr & 0x100000) {
/* IEEE FP exception */
_exception(SIGFPE, regs);
} else if (regs->msr & 0x20000) {
/* trap exception */
#ifdef CONFIG_XMON
if (xmon_bpt(regs))
return;
#endif
_exception(SIGTRAP, regs);
} else {
_exception(SIGILL, regs);
}
}
void
SingleStepException(struct pt_regs *regs)
{
regs->msr &= ~MSR_SE; /* Turn off 'trace' bit */
#ifdef CONFIG_XMON
if (xmon_sstep(regs))
return;
#endif
_exception(SIGTRAP, regs);
}
void
AlignmentException(struct pt_regs *regs)
{
int fixed;
if (last_task_used_math == current)
giveup_fpu();
fixed = fix_alignment(regs);
if (fixed == 1) {
regs->nip += 4; /* skip over emulated instruction */
return;
}
if (fixed == -EFAULT) {
/* fixed == -EFAULT means the operand address was bad */
bad_page_fault(regs, regs->dar);
return;
}
_exception(SIGBUS, regs);
}
void
PromException(struct pt_regs *regs, int trap)
{
regs->trap = trap;
#ifdef CONFIG_XMON
xmon(regs);
#endif
printk("Exception %lx in prom at PC: %lx, SR: %lx\n",
regs->trap, regs->nip, regs->msr);
/* probably should turn up the toes here */
}
void
trace_syscall(struct pt_regs *regs)
{
printk("Task: %p(%d), PC: %08lX/%08lX, Syscall: %3ld, Result: %s%ld\n",
current, current->pid, regs->nip, regs->link, regs->gpr[0],
regs->ccr&0x10000000?"Error=":"", regs->gpr[3]);
}
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