Changeset 7de7cde in mainline

Timestamp:

2010-05-21T18:53:26Z (14 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

31198c12

Parents:

8aa9265

Message:

ppc32: add basic support for generating stack traces
(this does not cover the whole ABI, but it should still work in common cases)

Location:

kernel/arch/ppc32/src/debug

Files:

• stacktrace.c (modified) (1 diff)
• stacktrace_asm.S (modified) (2 diffs)

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;
 }
 

kernel/arch/ppc32/src/debug/stacktrace_asm.S

@@ -27 +27 @@
 #
 
+#include <arch/asm/regname.h>
+
 .text
 
@@ -33 +35 @@
 
 frame_pointer_get:
+        mr r3, sp
         blr
 
 program_counter_get:
+        mflr r3
         blr