diff options
| author | Christoph Hellwig <hch@lst.de> | 2008-04-17 14:35:00 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-04-18 15:37:19 +1000 |
| commit | fd3e0bbc6052ca9747a5332b382584ece83aab6d (patch) | |
| tree | 259ede52b1955bb2d6f592612526cb6d31c0bae2 /arch/powerpc | |
| 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')
| -rw-r--r-- | arch/powerpc/Kconfig | 4 | ||||
| -rw-r--r-- | arch/powerpc/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/stacktrace.c | 47 |
3 files changed, 52 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 7f2f126d1c2..ecca20d17a7 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -49,6 +49,10 @@ config IRQ_PER_CPU bool default y +config STACKTRACE_SUPPORT + bool + default y + config RWSEM_GENERIC_SPINLOCK bool diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index c1baf9d5903..5183a9012a0 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -67,6 +67,7 @@ obj-$(CONFIG_BOOTX_TEXT) += btext.o obj-$(CONFIG_SMP) += smp.o obj-$(CONFIG_KPROBES) += kprobes.o obj-$(CONFIG_PPC_UDBG_16550) += legacy_serial.o udbg_16550.o +obj-$(CONFIG_STACKTRACE) += stacktrace.o pci64-$(CONFIG_PPC64) += pci_dn.o isa-bridge.o 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 00000000000..e3638eeaaae --- /dev/null +++ b/arch/powerpc/kernel/stacktrace.c @@ -0,0 +1,47 @@ +/* + * Stack trace utility + * + * Copyright 2008 Christoph Hellwig, IBM Corp. + * + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/sched.h> +#include <linux/stacktrace.h> +#include <asm/ptrace.h> +#include <asm/asm-offsets.h> + +/* + * Save stack-backtrace addresses into a stack_trace buffer. + */ +void save_stack_trace(struct stack_trace *trace) +{ + unsigned long sp; + + asm("mr %0,1" : "=r" (sp)); + + for (;;) { + unsigned long *stack = (unsigned long *) sp; + unsigned long newsp, ip; + + if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD)) + return; + + newsp = stack[0]; + ip = stack[STACK_FRAME_LR_SAVE]; + + if (!trace->skip) + trace->entries[trace->nr_entries++] = ip; + else + trace->skip--; + + if (trace->nr_entries >= trace->max_entries) + return; + + sp = newsp; + } +} |