[ARM] 5381/1: unwind: Reorganise the traps.c code
This patch moves code around in the arch/arm/kernel/traps.c file for
easier integration of the stack unwinding support.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/include/asm/traps.h b/arch/arm/include/asm/traps.h
index aa399ae..491960b 100644
--- a/arch/arm/include/asm/traps.h
+++ b/arch/arm/include/asm/traps.h
@@ -25,5 +25,6 @@
}
extern void __init early_trap_init(void);
+extern void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame);
#endif
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 79abc4d..f68ca0f 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -152,11 +152,25 @@
static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
{
- unsigned int fp;
+ unsigned int fp, mode;
int ok = 1;
printk("Backtrace: ");
- fp = regs->ARM_fp;
+
+ if (!tsk)
+ tsk = current;
+
+ if (regs) {
+ fp = regs->ARM_fp;
+ mode = processor_mode(regs);
+ } else if (tsk != current) {
+ fp = thread_saved_fp(tsk);
+ mode = 0x10;
+ } else {
+ asm("mov %0, fp" : "=r" (fp) : : "cc");
+ mode = 0x10;
+ }
+
if (!fp) {
printk("no frame pointer");
ok = 0;
@@ -168,29 +182,19 @@
printk("\n");
if (ok)
- c_backtrace(fp, processor_mode(regs));
+ c_backtrace(fp, mode);
}
void dump_stack(void)
{
- __backtrace();
+ dump_backtrace(NULL, NULL);
}
EXPORT_SYMBOL(dump_stack);
void show_stack(struct task_struct *tsk, unsigned long *sp)
{
- unsigned long fp;
-
- if (!tsk)
- tsk = current;
-
- if (tsk != current)
- fp = thread_saved_fp(tsk);
- else
- asm("mov %0, fp" : "=r" (fp) : : "cc");
-
- c_backtrace(fp, 0x10);
+ dump_backtrace(NULL, tsk);
barrier();
}