diff options
author | Christoph Hellwig <hch@lst.de> | 2008-04-17 00:35:00 -0400 |
---|---|---|
committer | Paul Mackerras <paulus@samba.org> | 2008-04-18 01:37:19 -0400 |
commit | fd3e0bbc6052ca9747a5332b382584ece83aab6d (patch) | |
tree | 259ede52b1955bb2d6f592612526cb6d31c0bae2 /arch/powerpc/kernel | |
parent | ec2b36b9f23cfbbe94d89724b796b44fd57d5221 (diff) |
[POWERPC] Stacktrace support for lockdep
This adds stacktrace support for powerpc, which will be needed for
lockdep.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r-- | arch/powerpc/kernel/Makefile | 1 | ||||
-rw-r--r-- | arch/powerpc/kernel/stacktrace.c | 47 |
2 files changed, 48 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index c1baf9d5903f..5183a9012a08 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile | |||
@@ -67,6 +67,7 @@ obj-$(CONFIG_BOOTX_TEXT) += btext.o | |||
67 | obj-$(CONFIG_SMP) += smp.o | 67 | obj-$(CONFIG_SMP) += smp.o |
68 | obj-$(CONFIG_KPROBES) += kprobes.o | 68 | obj-$(CONFIG_KPROBES) += kprobes.o |
69 | obj-$(CONFIG_PPC_UDBG_16550) += legacy_serial.o udbg_16550.o | 69 | obj-$(CONFIG_PPC_UDBG_16550) += legacy_serial.o udbg_16550.o |
70 | obj-$(CONFIG_STACKTRACE) += stacktrace.o | ||
70 | 71 | ||
71 | pci64-$(CONFIG_PPC64) += pci_dn.o isa-bridge.o | 72 | pci64-$(CONFIG_PPC64) += pci_dn.o isa-bridge.o |
72 | obj-$(CONFIG_PCI) += pci_$(CONFIG_WORD_SIZE).o $(pci64-y) \ | 73 | obj-$(CONFIG_PCI) += pci_$(CONFIG_WORD_SIZE).o $(pci64-y) \ |
diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c new file mode 100644 index 000000000000..e3638eeaaae7 --- /dev/null +++ b/arch/powerpc/kernel/stacktrace.c | |||
@@ -0,0 +1,47 @@ | |||
1 | /* | ||
2 | * Stack trace utility | ||
3 | * | ||
4 | * Copyright 2008 Christoph Hellwig, IBM Corp. | ||
5 | * | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or | ||
8 | * modify it under the terms of the GNU General Public License | ||
9 | * as published by the Free Software Foundation; either version | ||
10 | * 2 of the License, or (at your option) any later version. | ||
11 | */ | ||
12 | |||
13 | #include <linux/sched.h> | ||
14 | #include <linux/stacktrace.h> | ||
15 | #include <asm/ptrace.h> | ||
16 | #include <asm/asm-offsets.h> | ||
17 | |||
18 | /* | ||
19 | * Save stack-backtrace addresses into a stack_trace buffer. | ||
20 | */ | ||
21 | void save_stack_trace(struct stack_trace *trace) | ||
22 | { | ||
23 | unsigned long sp; | ||
24 | |||
25 | asm("mr %0,1" : "=r" (sp)); | ||
26 | |||
27 | for (;;) { | ||
28 | unsigned long *stack = (unsigned long *) sp; | ||
29 | unsigned long newsp, ip; | ||
30 | |||
31 | if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD)) | ||
32 | return; | ||
33 | |||
34 | newsp = stack[0]; | ||
35 | ip = stack[STACK_FRAME_LR_SAVE]; | ||
36 | |||
37 | if (!trace->skip) | ||
38 | trace->entries[trace->nr_entries++] = ip; | ||
39 | else | ||
40 | trace->skip--; | ||
41 | |||
42 | if (trace->nr_entries >= trace->max_entries) | ||
43 | return; | ||
44 | |||
45 | sp = newsp; | ||
46 | } | ||
47 | } | ||