diff options
| -rw-r--r-- | arch/avr32/Kconfig | 3 | ||||
| -rw-r--r-- | arch/avr32/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/avr32/kernel/stacktrace.c | 53 |
3 files changed, 57 insertions, 0 deletions
diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig index b108dd83f23..599ec166d83 100644 --- a/arch/avr32/Kconfig +++ b/arch/avr32/Kconfig @@ -24,6 +24,9 @@ config GENERIC_GPIO config GENERIC_HARDIRQS def_bool y +config STACKTRACE_SUPPORT + def_bool y + config HARDIRQS_SW_RESEND def_bool y diff --git a/arch/avr32/kernel/Makefile b/arch/avr32/kernel/Makefile index 989fcd1fef7..2d6d48f35f6 100644 --- a/arch/avr32/kernel/Makefile +++ b/arch/avr32/kernel/Makefile @@ -11,3 +11,4 @@ obj-y += signal.o sys_avr32.o process.o time.o obj-y += init_task.o switch_to.o cpu.o obj-$(CONFIG_MODULES) += module.o avr32_ksyms.o obj-$(CONFIG_KPROBES) += kprobes.o +obj-$(CONFIG_STACKTRACE) += stacktrace.o diff --git a/arch/avr32/kernel/stacktrace.c b/arch/avr32/kernel/stacktrace.c new file mode 100644 index 00000000000..9a68190bbff --- /dev/null +++ b/arch/avr32/kernel/stacktrace.c @@ -0,0 +1,53 @@ +/* + * Stack trace management functions + * + * Copyright (C) 2007 Atmel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/sched.h> +#include <linux/stacktrace.h> +#include <linux/thread_info.h> + +register unsigned long current_frame_pointer asm("r7"); + +struct stackframe { + unsigned long lr; + unsigned long fp; +}; + +/* + * 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 - 8)) { + frame = (struct stackframe *)fp; + + if (skip) { + skip--; + } else { + trace->entries[trace->nr_entries++] = frame->lr; + if (trace->nr_entries >= trace->max_entries) + break; + } + + /* + * The next frame must be at a higher address than the + * current frame. + */ + low = fp + 8; + fp = frame->fp; + } +} |