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microblaze: Add stack unwinder

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Implement intelligent backtracing by searching for stack frame creation,
and emitting only return addresses. Use print_hex_dump() to display the
entire binary kernel stack.

Limitation: MMU kernels are not currently able to trace beyond a system trap
(interrupt, syscall, etc.). It is the intent of this patch to provide
infrastructure that can be extended to add this capability later.

Changes from V1:
* Removed checks in find_frame_creation() that prevented location of the frame
  creation instruction in heavily optimized code
* Various formatting/commenting/file location tweaks per review comments
* Dropped Kconfig option to enable STACKTRACE as something logically separate

Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
This commit is contained in:
Steven J. Magnani
2010-04-27 12:37:54 -05:00
committed by Michal Simek
parent ba9c4f88d7
commit ce3266c047
10 changed files with 454 additions and 95 deletions
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4
arch/microblaze/kernel/hw_exception_handler.S
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@@ -78,9 +78,6 @@
#include <asm/asm-offsets.h>
/* Helpful Macros */
#ifndef CONFIG_MMU
#define EX_HANDLER_STACK_SIZ (4*19)
#endif
#define NUM_TO_REG(num) r ## num
#ifdef CONFIG_MMU
@@ -988,6 +985,7 @@ ex_unaligned_fixup:
.end _unaligned_data_exception
#endif /* CONFIG_MMU */
.global ex_handler_unhandled
ex_handler_unhandled:
/* FIXME add handle function for unhandled exception - dump register */
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