diff options
author | Mike Frysinger <vapier@gentoo.org> | 2009-06-08 22:44:45 (GMT) |
---|---|---|
committer | Mike Frysinger <vapier@gentoo.org> | 2009-06-13 11:20:14 (GMT) |
commit | c7b412f41d9c95d084e049fe83248ebb41a2d8f5 (patch) | |
tree | b5e1eefd75ed64ced934c2b24a49bc894f3010ef /arch/blackfin/kernel/stacktrace.c | |
parent | 5203fa82f3907a9c3357f84aa1cdfb57e55cc175 (diff) | |
download | linux-fsl-qoriq-c7b412f41d9c95d084e049fe83248ebb41a2d8f5.tar.xz |
Blackfin: add preliminary support for STACKTRACE
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/kernel/stacktrace.c')
-rw-r--r-- | arch/blackfin/kernel/stacktrace.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/stacktrace.c b/arch/blackfin/kernel/stacktrace.c new file mode 100644 index 0000000..30301e1 --- /dev/null +++ b/arch/blackfin/kernel/stacktrace.c @@ -0,0 +1,53 @@ +/* + * Blackfin stacktrace code (mostly copied from avr32) + * + * Copyright 2009 Analog Devices Inc. + * Licensed under the GPL-2 or later. + */ + +#include <linux/sched.h> +#include <linux/stacktrace.h> +#include <linux/thread_info.h> +#include <linux/module.h> + +register unsigned long current_frame_pointer asm("FP"); + +struct stackframe { + unsigned long fp; + unsigned long rets; +}; + +/* + * Save stack-backtrace addresses into a stack_trace buffer. + */ +void save_stack_trace(struct stack_trace *trace) +{ + unsigned long low, high; + unsigned long fp; + struct stackframe *frame; + int skip = trace->skip; + + low = (unsigned long)task_stack_page(current); + high = low + THREAD_SIZE; + fp = current_frame_pointer; + + while (fp >= low && fp <= (high - sizeof(*frame))) { + frame = (struct stackframe *)fp; + + if (skip) { + skip--; + } else { + trace->entries[trace->nr_entries++] = frame->rets; + if (trace->nr_entries >= trace->max_entries) + break; + } + + /* + * The next frame must be at a higher address than the + * current frame. + */ + low = fp + sizeof(*frame); + fp = frame->fp; + } +} +EXPORT_SYMBOL_GPL(save_stack_trace); |