diff options
Diffstat (limited to 'arch/microblaze/kernel/stacktrace.c')
| -rw-r--r-- | arch/microblaze/kernel/stacktrace.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/stacktrace.c b/arch/microblaze/kernel/stacktrace.c new file mode 100644 index 000000000000..123692f22647 --- /dev/null +++ b/arch/microblaze/kernel/stacktrace.c @@ -0,0 +1,65 @@ +/* + * Stack trace support for Microblaze. + * + * Copyright (C) 2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2009 PetaLogix + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/sched.h> +#include <linux/stacktrace.h> +#include <linux/thread_info.h> +#include <linux/ptrace.h> +#include <linux/module.h> + +/* FIXME initial support */ +void save_stack_trace(struct stack_trace *trace) +{ + unsigned long *sp; + unsigned long addr; + asm("addik %0, r1, 0" : "=r" (sp)); + + while (!kstack_end(sp)) { + addr = *sp++; + if (__kernel_text_address(addr)) { + if (trace->skip > 0) + trace->skip--; + else + trace->entries[trace->nr_entries++] = addr; + + if (trace->nr_entries >= trace->max_entries) + break; + } + } +} +EXPORT_SYMBOL_GPL(save_stack_trace); + +void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) +{ + unsigned int *sp; + unsigned long addr; + + struct thread_info *ti = task_thread_info(tsk); + + if (tsk == current) + asm("addik %0, r1, 0" : "=r" (sp)); + else + sp = (unsigned int *)ti->cpu_context.r1; + + while (!kstack_end(sp)) { + addr = *sp++; + if (__kernel_text_address(addr)) { + if (trace->skip > 0) + trace->skip--; + else + trace->entries[trace->nr_entries++] = addr; + + if (trace->nr_entries >= trace->max_entries) + break; + } + } +} +EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |