sh: stack debugging support.
This adds a DEBUG_STACK_USAGE and DEBUG_STACKOVERFLOW for SH.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c
index c2e07f7..7066611 100644
--- a/arch/sh/kernel/irq.c
+++ b/arch/sh/kernel/irq.c
@@ -60,7 +60,6 @@
}
#endif
-
asmlinkage int do_IRQ(unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7,
struct pt_regs regs)
@@ -69,6 +68,22 @@
irq_enter();
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+ /* Debugging check for stack overflow: is there less than 1KB free? */
+ {
+ long sp;
+
+ __asm__ __volatile__ ("and r15, %0" :
+ "=r" (sp) : "0" (THREAD_SIZE - 1));
+
+ if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
+ printk("do_IRQ: stack overflow: %ld\n",
+ sp - sizeof(struct thread_info));
+ dump_stack();
+ }
+ }
+#endif
+
#ifdef CONFIG_CPU_HAS_INTEVT
__asm__ __volatile__ (
#ifdef CONFIG_CPU_HAS_SR_RB