Changes in kernel/arch/ppc32/src/debug/stacktrace.c [d99c1d2:da1bafb] in mainline

File:

• kernel/arch/ppc32/src/debug/stacktrace.c (modified) (1 diff)

kernel/arch/ppc32/src/debug/stacktrace.c

@@ -37 +37 @@
 #include <typedefs.h>
 
+#define FRAME_OFFSET_FP_PREV  0
+#define FRAME_OFFSET_RA       1
+
 bool kernel_frame_pointer_validate(uintptr_t fp)
 {
-        return false;
+        return fp != 0;
 }
 
 bool kernel_frame_pointer_prev(uintptr_t fp, uintptr_t *prev)
 {
-        return false;
+        uint32_t *stack = (void *) fp;
+        *prev = stack[FRAME_OFFSET_FP_PREV];
+        return true;
 }
 
 bool kernel_return_address_get(uintptr_t fp, uintptr_t *ra)
 {
-        return false;
+        uint32_t *stack = (void *) fp;
+        *ra = stack[FRAME_OFFSET_RA];
+        return true;
 }
 
 bool uspace_frame_pointer_validate(uintptr_t fp)
 {
-        return false;
+        return fp != 0;
 }
 
 bool uspace_frame_pointer_prev(uintptr_t fp, uintptr_t *prev)
 {
-        return false;
+        return !copy_from_uspace((void *) prev,
+            (uint32_t *) fp + FRAME_OFFSET_FP_PREV, sizeof(*prev));
 }
 
 bool uspace_return_address_get(uintptr_t fp, uintptr_t *ra)
 {
-        return false;
+        return !copy_from_uspace((void *) ra, (uint32_t *) fp + FRAME_OFFSET_RA,
+            sizeof(*ra));
 }