| /* |
| * Stack trace management functions |
| * |
| * Copyright IBM Corp. 2006 |
| * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> |
| */ |
| |
| #include <linux/sched.h> |
| #include <linux/stacktrace.h> |
| #include <linux/kallsyms.h> |
| #include <linux/module.h> |
| |
| static int __save_address(void *data, unsigned long address, int nosched) |
| { |
| struct stack_trace *trace = data; |
| |
| if (nosched && in_sched_functions(address)) |
| return 0; |
| if (trace->skip > 0) { |
| trace->skip--; |
| return 0; |
| } |
| if (trace->nr_entries < trace->max_entries) { |
| trace->entries[trace->nr_entries++] = address; |
| return 0; |
| } |
| return 1; |
| } |
| |
| static int save_address(void *data, unsigned long address) |
| { |
| return __save_address(data, address, 0); |
| } |
| |
| static int save_address_nosched(void *data, unsigned long address) |
| { |
| return __save_address(data, address, 1); |
| } |
| |
| void save_stack_trace(struct stack_trace *trace) |
| { |
| unsigned long sp; |
| |
| sp = current_stack_pointer(); |
| dump_trace(save_address, trace, NULL, sp); |
| if (trace->nr_entries < trace->max_entries) |
| trace->entries[trace->nr_entries++] = ULONG_MAX; |
| } |
| EXPORT_SYMBOL_GPL(save_stack_trace); |
| |
| void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) |
| { |
| unsigned long sp; |
| |
| sp = tsk->thread.ksp; |
| if (tsk == current) |
| sp = current_stack_pointer(); |
| dump_trace(save_address_nosched, trace, tsk, sp); |
| if (trace->nr_entries < trace->max_entries) |
| trace->entries[trace->nr_entries++] = ULONG_MAX; |
| } |
| EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |
| |
| void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace) |
| { |
| unsigned long sp; |
| |
| sp = kernel_stack_pointer(regs); |
| dump_trace(save_address, trace, NULL, sp); |
| if (trace->nr_entries < trace->max_entries) |
| trace->entries[trace->nr_entries++] = ULONG_MAX; |
| } |
| EXPORT_SYMBOL_GPL(save_stack_trace_regs); |