[ARM] Add ability to dump exception stacks to kernel backtraces
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index e101846..a72b82e 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -109,7 +109,7 @@
* come via this function. Instead, they should provide their
* own 'handler'
*/
-asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
+asmlinkage void __exception asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
struct irq_desc *desc = irq_desc + irq;
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 2409560..ba1c188 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -45,7 +45,18 @@
__setup("user_debug=", user_debug_setup);
#endif
-void dump_backtrace_entry(unsigned long where, unsigned long from)
+static void dump_mem(const char *str, unsigned long bottom, unsigned long top);
+
+static inline int in_exception_text(unsigned long ptr)
+{
+ extern char __exception_text_start[];
+ extern char __exception_text_end[];
+
+ return ptr >= (unsigned long)&__exception_text_start &&
+ ptr < (unsigned long)&__exception_text_end;
+}
+
+void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame)
{
#ifdef CONFIG_KALLSYMS
printk("[<%08lx>] ", where);
@@ -55,6 +66,9 @@
#else
printk("Function entered at [<%08lx>] from [<%08lx>]\n", where, from);
#endif
+
+ if (in_exception_text(where))
+ dump_mem("Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
}
/*
@@ -266,7 +280,7 @@
spin_unlock_irqrestore(&undef_lock, flags);
}
-asmlinkage void do_undefinstr(struct pt_regs *regs)
+asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
{
unsigned int correction = thumb_mode(regs) ? 2 : 4;
unsigned int instr;
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index ddbdad4..b295f6a 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -83,6 +83,9 @@
.text : { /* Real text segment */
_text = .; /* Text and read-only data */
+ __exception_text_start = .;
+ *(.exception.text)
+ __exception_text_end = .;
*(.text)
SCHED_TEXT
LOCK_TEXT