Changeset 08c88b84 in mainline

Timestamp:

2010-05-12T23:55:14Z (14 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

989d3c2

Parents:

9929742

Message:

sparc64 kernel hooks for stack tracing.

Location:

kernel/arch/sparc64/src/debug

Files:

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

kernel/arch/sparc64/src/debug/stacktrace.c

@@ -37 +37 @@
 #include <typedefs.h>
 
+#include <arch/stack.h>
+
+#define FRAME_OFFSET_FP_PREV    14
+#define FRAME_OFFSET_RA         15
+
+extern void alloc_window_and_flush(void);
+
 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;
+        uint64_t *stack = (void *) fp;
+        alloc_window_and_flush();
+        *prev = stack[FRAME_OFFSET_FP_PREV] + STACK_BIAS;
+        return true;
 }
 
 bool kernel_return_address_get(uintptr_t fp, uintptr_t *ra)
 {
-        return false;
+        uint64_t *stack = (void *) fp;
+        alloc_window_and_flush();
+        *ra = stack[FRAME_OFFSET_RA];
+        return true;
 }
 

kernel/arch/sparc64/src/debug/stacktrace_asm.S

@@ -27 +27 @@
 #
 
+#include <arch/stack.h>
+
 .text
 
 .global frame_pointer_get
 .global program_counter_get
+.global alloc_window_and_flush
 
 frame_pointer_get:
+        # Add the stack bias to %sp to get the actual address.
         retl
-        nop
+        add %sp, STACK_BIAS, %o0
 
 program_counter_get:
         retl
-        nop
+        mov %o7, %o0
 
+alloc_window_and_flush:
+        save %sp, -(STACK_WINDOW_SAVE_AREA_SIZE+STACK_ARG_SAVE_AREA_SIZE), %sp
+        # Flush all other windows to memory so that we can read their contents.
+        flushw
+        ret
+        restore
+