diff options
Diffstat (limited to 'kernel/trace/trace_functions_graph.c')
| -rw-r--r-- | kernel/trace/trace_functions_graph.c | 92 |
1 files changed, 79 insertions, 13 deletions
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c index 3a0244ff7ea8..4e480e870474 100644 --- a/kernel/trace/trace_functions_graph.c +++ b/kernel/trace/trace_functions_graph.c @@ -119,7 +119,7 @@ print_graph_duration(struct trace_array *tr, unsigned long long duration, /* Add a function return address to the trace stack on thread info.*/ int ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth, - unsigned long frame_pointer) + unsigned long frame_pointer, unsigned long *retp) { unsigned long long calltime; int index; @@ -170,8 +170,12 @@ ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth, current->ret_stack[index].ret = ret; current->ret_stack[index].func = func; current->ret_stack[index].calltime = calltime; - current->ret_stack[index].subtime = 0; +#ifdef HAVE_FUNCTION_GRAPH_FP_TEST current->ret_stack[index].fp = frame_pointer; +#endif +#ifdef HAVE_FUNCTION_GRAPH_RET_ADDR_PTR + current->ret_stack[index].retp = retp; +#endif *depth = current->curr_ret_stack; return 0; @@ -204,7 +208,7 @@ ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret, return; } -#if defined(CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST) && !defined(CC_USING_FENTRY) +#ifdef HAVE_FUNCTION_GRAPH_FP_TEST /* * The arch may choose to record the frame pointer used * and check it here to make sure that it is what we expect it @@ -279,6 +283,64 @@ unsigned long ftrace_return_to_handler(unsigned long frame_pointer) return ret; } +/** + * ftrace_graph_ret_addr - convert a potentially modified stack return address + * to its original value + * + * This function can be called by stack unwinding code to convert a found stack + * return address ('ret') to its original value, in case the function graph + * tracer has modified it to be 'return_to_handler'. If the address hasn't + * been modified, the unchanged value of 'ret' is returned. + * + * 'idx' is a state variable which should be initialized by the caller to zero + * before the first call. + * + * 'retp' is a pointer to the return address on the stack. It's ignored if + * the arch doesn't have HAVE_FUNCTION_GRAPH_RET_ADDR_PTR defined. + */ +#ifdef HAVE_FUNCTION_GRAPH_RET_ADDR_PTR +unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx, + unsigned long ret, unsigned long *retp) +{ + int index = task->curr_ret_stack; + int i; + + if (ret != (unsigned long)return_to_handler) + return ret; + + if (index < -1) + index += FTRACE_NOTRACE_DEPTH; + + if (index < 0) + return ret; + + for (i = 0; i <= index; i++) + if (task->ret_stack[i].retp == retp) + return task->ret_stack[i].ret; + + return ret; +} +#else /* !HAVE_FUNCTION_GRAPH_RET_ADDR_PTR */ +unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx, + unsigned long ret, unsigned long *retp) +{ + int task_idx; + + if (ret != (unsigned long)return_to_handler) + return ret; + + task_idx = task->curr_ret_stack; + + if (!task->ret_stack || task_idx < *idx) + return ret; + + task_idx -= *idx; + (*idx)++; + + return task->ret_stack[task_idx].ret; +} +#endif /* HAVE_FUNCTION_GRAPH_RET_ADDR_PTR */ + int __trace_graph_entry(struct trace_array *tr, struct ftrace_graph_ent *trace, unsigned long flags, @@ -319,7 +381,7 @@ int trace_graph_entry(struct ftrace_graph_ent *trace) int cpu; int pc; - if (!ftrace_trace_task(current)) + if (!ftrace_trace_task(tr)) return 0; /* trace it when it is-nested-in or is a function enabled. */ @@ -338,6 +400,13 @@ int trace_graph_entry(struct ftrace_graph_ent *trace) if (ftrace_graph_notrace_addr(trace->func)) return 1; + /* + * Stop here if tracing_threshold is set. We only write function return + * events to the ring buffer. + */ + if (tracing_thresh) + return 1; + local_irq_save(flags); cpu = raw_smp_processor_id(); data = per_cpu_ptr(tr->trace_buffer.data, cpu); @@ -355,14 +424,6 @@ int trace_graph_entry(struct ftrace_graph_ent *trace) return ret; } -static int trace_graph_thresh_entry(struct ftrace_graph_ent *trace) -{ - if (tracing_thresh) - return 1; - else - return trace_graph_entry(trace); -} - static void __trace_graph_function(struct trace_array *tr, unsigned long ip, unsigned long flags, int pc) @@ -457,7 +518,7 @@ static int graph_trace_init(struct trace_array *tr) set_graph_array(tr); if (tracing_thresh) ret = register_ftrace_graph(&trace_graph_thresh_return, - &trace_graph_thresh_entry); + &trace_graph_entry); else ret = register_ftrace_graph(&trace_graph_return, &trace_graph_entry); @@ -1121,6 +1182,11 @@ print_graph_comment(struct trace_seq *s, struct trace_entry *ent, trace_seq_puts(s, "/* "); switch (iter->ent->type) { + case TRACE_BPUTS: + ret = trace_print_bputs_msg_only(iter); + if (ret != TRACE_TYPE_HANDLED) + return ret; + break; case TRACE_BPRINT: ret = trace_print_bprintk_msg_only(iter); if (ret != TRACE_TYPE_HANDLED) |