| Michal Simek | 24b45a1 | 2009-11-10 15:57:01 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Stack trace support for Microblaze. |
| 3 | * |
| 4 | * Copyright (C) 2009 Michal Simek <monstr@monstr.eu> |
| 5 | * Copyright (C) 2009 PetaLogix |
| 6 | * |
| 7 | * This file is subject to the terms and conditions of the GNU General Public |
| 8 | * License. See the file "COPYING" in the main directory of this archive |
| 9 | * for more details. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/stacktrace.h> |
| 14 | #include <linux/thread_info.h> |
| 15 | #include <linux/ptrace.h> |
| 16 | #include <linux/module.h> |
| 17 | |
| 18 | /* FIXME initial support */ |
| 19 | void save_stack_trace(struct stack_trace *trace) |
| 20 | { |
| 21 | unsigned long *sp; |
| 22 | unsigned long addr; |
| 23 | asm("addik %0, r1, 0" : "=r" (sp)); |
| 24 | |
| 25 | while (!kstack_end(sp)) { |
| 26 | addr = *sp++; |
| 27 | if (__kernel_text_address(addr)) { |
| 28 | if (trace->skip > 0) |
| 29 | trace->skip--; |
| 30 | else |
| 31 | trace->entries[trace->nr_entries++] = addr; |
| 32 | |
| 33 | if (trace->nr_entries >= trace->max_entries) |
| 34 | break; |
| 35 | } |
| 36 | } |
| 37 | } |
| 38 | EXPORT_SYMBOL_GPL(save_stack_trace); |
| 39 | |
| 40 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) |
| 41 | { |
| 42 | unsigned int *sp; |
| 43 | unsigned long addr; |
| 44 | |
| 45 | struct thread_info *ti = task_thread_info(tsk); |
| 46 | |
| 47 | if (tsk == current) |
| 48 | asm("addik %0, r1, 0" : "=r" (sp)); |
| 49 | else |
| 50 | sp = (unsigned int *)ti->cpu_context.r1; |
| 51 | |
| 52 | while (!kstack_end(sp)) { |
| 53 | addr = *sp++; |
| 54 | if (__kernel_text_address(addr)) { |
| 55 | if (trace->skip > 0) |
| 56 | trace->skip--; |
| 57 | else |
| 58 | trace->entries[trace->nr_entries++] = addr; |
| 59 | |
| 60 | if (trace->nr_entries >= trace->max_entries) |
| 61 | break; |
| 62 | } |
| 63 | } |
| 64 | } |
| 65 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |