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authorChris Metcalf <cmetcalf@ezchip.com>2015-12-17 15:01:38 -0500
committerChris Metcalf <cmetcalf@ezchip.com>2016-01-18 14:49:16 -0500
commit5ac65abd48b6d3c62ec17dc4c28830513dd605e0 (patch)
treeb9c5e1ff8b8fa460f41b408d379d8a10eda135a7 /arch
parent7fa129ccb92c982ee8947d7fe004d7fd4f0691b9 (diff)
downloadlinux-5ac65abd48b6d3c62ec17dc4c28830513dd605e0.tar.bz2
tile: include the syscall number in the backtrace
This information is easily available in the backtrace data and can be helpful when trying to figure out the backtrace, particularly if we're early in kernel entry or late in kernel exit. Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/tile/kernel/stack.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/arch/tile/kernel/stack.c b/arch/tile/kernel/stack.c
index 402b9c85a894..22bbbd3ff4a3 100644
--- a/arch/tile/kernel/stack.c
+++ b/arch/tile/kernel/stack.c
@@ -78,8 +78,7 @@ static bool read_memory_func(void *result, unsigned long address,
/* Return a pt_regs pointer for a valid fault handler frame */
static struct pt_regs *valid_fault_handler(struct KBacktraceIterator* kbt)
{
- const char *fault = NULL; /* happy compiler */
- char fault_buf[64];
+ char fault[64];
unsigned long sp = kbt->it.sp;
struct pt_regs *p;
@@ -90,14 +89,14 @@ static struct pt_regs *valid_fault_handler(struct KBacktraceIterator* kbt)
if (!in_kernel_stack(kbt, sp + C_ABI_SAVE_AREA_SIZE + PTREGS_SIZE-1))
return NULL;
p = (struct pt_regs *)(sp + C_ABI_SAVE_AREA_SIZE);
- if (p->faultnum == INT_SWINT_1 || p->faultnum == INT_SWINT_1_SIGRETURN)
- fault = "syscall";
- else {
- if (kbt->verbose) { /* else we aren't going to use it */
- snprintf(fault_buf, sizeof(fault_buf),
+ if (kbt->verbose) { /* else we aren't going to use it */
+ if (p->faultnum == INT_SWINT_1 ||
+ p->faultnum == INT_SWINT_1_SIGRETURN)
+ snprintf(fault, sizeof(fault),
+ "syscall %ld", p->regs[TREG_SYSCALL_NR]);
+ else
+ snprintf(fault, sizeof(fault),
"interrupt %ld", p->faultnum);
- fault = fault_buf;
- }
}
if (EX1_PL(p->ex1) == KERNEL_PL &&
__kernel_text_address(p->pc) &&