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arch/tile: add descriptive text if the kernel reports a bad trap

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If the kernel unexpectedly takes a bad trap, it's convenient to
have it report the type of trap as part of the error.  This gives
customers a bit more context before they call up customer support.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf 2012-03-30 16:31:08 -04:00
parent 8703d6e0fc
commit c6f696f69a
1 changed files with 28 additions and 2 deletions
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30
arch/tile/kernel/traps.c
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@ -195,6 +195,25 @@ static int special_ill(bundle_bits bundle, int *sigp, int *codep)
return 1; return 1;
} }
static const char *const int_name[] = {
[INT_MEM_ERROR] = "Memory error",
[INT_ILL] = "Illegal instruction",
[INT_GPV] = "General protection violation",
[INT_UDN_ACCESS] = "UDN access",
[INT_IDN_ACCESS] = "IDN access",
#if CHIP_HAS_SN()
[INT_SN_ACCESS] = "SN access",
#endif
[INT_SWINT_3] = "Software interrupt 3",
[INT_SWINT_2] = "Software interrupt 2",
[INT_SWINT_0] = "Software interrupt 0",
[INT_UNALIGN_DATA] = "Unaligned data",
[INT_DOUBLE_FAULT] = "Double fault",
#ifdef __tilegx__
[INT_ILL_TRANS] = "Illegal virtual address",
#endif
};
void __kprobes do_trap(struct pt_regs *regs, int fault_num, void __kprobes do_trap(struct pt_regs *regs, int fault_num,
unsigned long reason) unsigned long reason)
{ {
@ -211,10 +230,17 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
* current process and hope for the best. * current process and hope for the best.
*/ */
if (!user_mode(regs)) { if (!user_mode(regs)) {
const char *name;
if (fixup_exception(regs)) /* only UNALIGN_DATA in practice */ if (fixup_exception(regs)) /* only UNALIGN_DATA in practice */
return; return;
pr_alert("Kernel took bad trap %d at PC %#lx\n", if (fault_num >= 0 &&
fault_num, regs->pc); fault_num < sizeof(int_name)/sizeof(int_name[0]) &&
int_name[fault_num] != NULL)
name = int_name[fault_num];
else
name = "Unknown interrupt";
pr_alert("Kernel took bad trap %d (%s) at PC %#lx\n",
fault_num, name, regs->pc);
if (fault_num == INT_GPV) if (fault_num == INT_GPV)
pr_alert("GPV_REASON is %#lx\n", reason); pr_alert("GPV_REASON is %#lx\n", reason);
show_regs(regs); show_regs(regs);