diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/blackfin/Kconfig | 3 | ||||
| -rw-r--r-- | arch/blackfin/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/blackfin/kernel/stacktrace.c | 53 |
3 files changed, 57 insertions, 0 deletions
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig index d68cb0dc583..77ec14fcc61 100644 --- a/arch/blackfin/Kconfig +++ b/arch/blackfin/Kconfig @@ -55,6 +55,9 @@ config FORCE_MAX_ZONEORDER config GENERIC_CALIBRATE_DELAY def_bool y +config STACKTRACE_SUPPORT + def_bool y + config TRACE_IRQFLAGS_SUPPORT def_bool y diff --git a/arch/blackfin/kernel/Makefile b/arch/blackfin/kernel/Makefile index fd4d4328a0f..a66dda4f4b1 100644 --- a/arch/blackfin/kernel/Makefile +++ b/arch/blackfin/kernel/Makefile @@ -23,6 +23,7 @@ obj-$(CONFIG_MODULES) += module.o obj-$(CONFIG_KGDB) += kgdb.o obj-$(CONFIG_KGDB_TESTS) += kgdb_test.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o +obj-$(CONFIG_STACKTRACE) += stacktrace.o # the kgdb test puts code into L2 and without linker # relaxation, we need to force long calls to/from it diff --git a/arch/blackfin/kernel/stacktrace.c b/arch/blackfin/kernel/stacktrace.c new file mode 100644 index 00000000000..30301e1eace --- /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); |