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OpenRISC: Traps
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Signed-off-by: Jonas Bonn <jonas@southpole.se>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
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Jonas Bonn committed Jul 22, 2011
1 parent 5a2bbb8 commit 769a8a9
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366 changes: 366 additions & 0 deletions arch/openrisc/kernel/traps.c
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/*
* OpenRISC traps.c
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* Modifications for the OpenRISC architecture:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
*
* 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.
*
* Here we handle the break vectors not used by the system call
* mechanism, as well as some general stack/register dumping
* things.
*
*/

#include <linux/init.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/kallsyms.h>
#include <asm/uaccess.h>

#include <asm/system.h>
#include <asm/segment.h>
#include <asm/io.h>
#include <asm/pgtable.h>

extern char _etext, _stext;

int kstack_depth_to_print = 0x180;

static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
{
return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3;
}

void show_trace(struct task_struct *task, unsigned long *stack)
{
struct thread_info *context;
unsigned long addr;

context = (struct thread_info *)
((unsigned long)stack & (~(THREAD_SIZE - 1)));

while (valid_stack_ptr(context, stack)) {
addr = *stack++;
if (__kernel_text_address(addr)) {
printk(" [<%08lx>]", addr);
print_symbol(" %s", addr);
printk("\n");
}
}
printk(" =======================\n");
}

/* displays a short stack trace */
void show_stack(struct task_struct *task, unsigned long *esp)
{
unsigned long addr, *stack;
int i;

if (esp == NULL)
esp = (unsigned long *)&esp;

stack = esp;

printk("Stack dump [0x%08lx]:\n", (unsigned long)esp);
for (i = 0; i < kstack_depth_to_print; i++) {
if (kstack_end(stack))
break;
if (__get_user(addr, stack)) {
/* This message matches "failing address" marked
s390 in ksymoops, so lines containing it will
not be filtered out by ksymoops. */
printk("Failing address 0x%lx\n", (unsigned long)stack);
break;
}
stack++;

printk("sp + %02d: 0x%08lx\n", i * 4, addr);
}
printk("\n");

show_trace(task, esp);

return;
}

void show_trace_task(struct task_struct *tsk)
{
/*
* TODO: SysRq-T trace dump...
*/
}

/*
* The architecture-independent backtrace generator
*/
void dump_stack(void)
{
unsigned long stack;

show_stack(current, &stack);
}

void show_registers(struct pt_regs *regs)
{
int i;
int in_kernel = 1;
unsigned long esp;

esp = (unsigned long)(&regs->sp);
if (user_mode(regs))
in_kernel = 0;

printk("CPU #: %d\n"
" PC: %08lx SR: %08lx SP: %08lx\n",
smp_processor_id(), regs->pc, regs->sr, regs->sp);
printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
printk(" RES: %08lx oGPR11: %08lx syscallno: %08lx\n",
regs->gpr[11], regs->orig_gpr11, regs->syscallno);

printk("Process %s (pid: %d, stackpage=%08lx)\n",
current->comm, current->pid, (unsigned long)current);
/*
* When in-kernel, we also print out the stack and code at the
* time of the fault..
*/
if (in_kernel) {

printk("\nStack: ");
show_stack(NULL, (unsigned long *)esp);

printk("\nCode: ");
if (regs->pc < PAGE_OFFSET)
goto bad;

for (i = -24; i < 24; i++) {
unsigned char c;
if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
bad:
printk(" Bad PC value.");
break;
}

if (i == 0)
printk("(%02x) ", c);
else
printk("%02x ", c);
}
}
printk("\n");
}

void nommu_dump_state(struct pt_regs *regs,
unsigned long ea, unsigned long vector)
{
int i;
unsigned long addr, stack = regs->sp;

printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);

printk("CPU #: %d\n"
" PC: %08lx SR: %08lx SP: %08lx\n",
0, regs->pc, regs->sr, regs->sp);
printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
printk(" RES: %08lx oGPR11: %08lx syscallno: %08lx\n",
regs->gpr[11], regs->orig_gpr11, regs->syscallno);

printk("Process %s (pid: %d, stackpage=%08lx)\n",
((struct task_struct *)(__pa(current)))->comm,
((struct task_struct *)(__pa(current)))->pid,
(unsigned long)current);

printk("\nStack: ");
printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
for (i = 0; i < kstack_depth_to_print; i++) {
if (((long)stack & (THREAD_SIZE - 1)) == 0)
break;
stack++;

printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
*((unsigned long *)(__pa(stack))));
}
printk("\n");

printk("Call Trace: ");
i = 1;
while (((long)stack & (THREAD_SIZE - 1)) != 0) {
addr = *((unsigned long *)__pa(stack));
stack++;

if (kernel_text_address(addr)) {
if (i && ((i % 6) == 0))
printk("\n ");
printk(" [<%08lx>]", addr);
i++;
}
}
printk("\n");

printk("\nCode: ");

for (i = -24; i < 24; i++) {
unsigned char c;
c = ((unsigned char *)(__pa(regs->pc)))[i];

if (i == 0)
printk("(%02x) ", c);
else
printk("%02x ", c);
}
printk("\n");
}

/* This is normally the 'Oops' routine */
void die(const char *str, struct pt_regs *regs, long err)
{

console_verbose();
printk("\n%s#: %04lx\n", str, err & 0xffff);
show_registers(regs);
#ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");

/* shut down interrupts */
local_irq_disable();

__asm__ __volatile__("l.nop 1");
do {} while (1);
#endif
do_exit(SIGSEGV);
}

/* This is normally the 'Oops' routine */
void die_if_kernel(const char *str, struct pt_regs *regs, long err)
{
if (user_mode(regs))
return;

die(str, regs, err);
}

void unhandled_exception(struct pt_regs *regs, int ea, int vector)
{
printk("Unable to handle exception at EA =0x%x, vector 0x%x",
ea, vector);
die("Oops", regs, 9);
}

void __init trap_init(void)
{
/* Nothing needs to be done */
}

asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
{
siginfo_t info;
memset(&info, 0, sizeof(info));
info.si_signo = SIGTRAP;
info.si_code = TRAP_TRACE;
info.si_addr = (void *)address;
force_sig_info(SIGTRAP, &info, current);

regs->pc += 4;
}

asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
{
siginfo_t info;

if (user_mode(regs)) {
/* Send a SIGSEGV */
info.si_signo = SIGSEGV;
info.si_errno = 0;
/* info.si_code has been set above */
info.si_addr = (void *)address;
force_sig_info(SIGSEGV, &info, current);
} else {
printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
show_registers(regs);
die("Die:", regs, address);
}

}

asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
{
siginfo_t info;

if (user_mode(regs)) {
/* Send a SIGBUS */
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = BUS_ADRERR;
info.si_addr = (void *)address;
force_sig_info(SIGBUS, &info, current);
} else { /* Kernel mode */
printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
show_registers(regs);
die("Die:", regs, address);
}
}

asmlinkage void do_illegal_instruction(struct pt_regs *regs,
unsigned long address)
{
siginfo_t info;

if (user_mode(regs)) {
/* Send a SIGILL */
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLOPC;
info.si_addr = (void *)address;
force_sig_info(SIGBUS, &info, current);
} else { /* Kernel mode */
printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
address);
show_registers(regs);
die("Die:", regs, address);
}
}

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