Changeset 7c8e1e1 in mainline for kernel/arch/sparc64/src/debug

Timestamp:

2010-05-21T23:02:10Z (16 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

ecbd287d

Parents:

3500f75 (diff), 0242621 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge initial support for sparc64 kernel 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.h>
+#include <arch/stack.h>
+#include <arch/trap/trap_table.h>
+
+#if defined(SUN4V)
+#include <arch/sun4v/arch.h>
+#endif
+
+#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;
+        uintptr_t kstack;
+        
+#if defined(SUN4U)
+        kstack = read_from_ag_g6();
+#elif defined(SUN4V)
+        kstack = asi_u64_read(ASI_SCRATCHPAD, SCRATCHPAD_KSTACK);
+#endif
+
+        kstack += STACK_BIAS;
+        kstack -= PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE;
+
+        if (THREAD && (fp == kstack))
+                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
+