| 1 | |
| 2 | |
| 3 | * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <[email protected]>
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| 4 |
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| 5 | #include <stdio.h>
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| 6 | #include <stdlib.h>
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| 7 | #include <string.h>
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| 8 |
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| 9 | #include "event-parse.h"
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| 10 | #include "event-utils.h"
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| 11 | #include "trace-seq.h"
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| 12 |
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| 13 | static struct func_stack {
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| 14 | int size;
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| 15 | char **stack;
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| 16 | } *fstack;
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| 17 |
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| 18 | static int cpus = -1;
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| 19 |
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| 20 | #define STK_BLK 10
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| 21 |
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| 22 | struct tep_plugin_option plugin_options[] =
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| 23 | {
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| 24 | {
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| 25 | .name = "parent",
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| 26 | .plugin_alias = "ftrace",
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| 27 | .description =
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| 28 | "Print parent of functions for function events",
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| 29 | },
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| 30 | {
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| 31 | .name = "indent",
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| 32 | .plugin_alias = "ftrace",
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| 33 | .description =
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| 34 | "Try to show function call indents, based on parents",
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| 35 | .set = 1,
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| 36 | },
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| 37 | {
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| 38 | .name = "offset",
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| 39 | .plugin_alias = "ftrace",
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| 40 | .description =
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| 41 | "Show function names as well as their offsets",
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| 42 | .set = 0,
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| 43 | },
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| 44 | {
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| 45 | .name = NULL,
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| 46 | }
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| 47 | };
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| 48 |
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| 49 | static struct tep_plugin_option *ftrace_parent = &plugin_options[0];
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| 50 | static struct tep_plugin_option *ftrace_indent = &plugin_options[1];
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| 51 | static struct tep_plugin_option *ftrace_offset = &plugin_options[2];
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| 52 |
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| 53 | static void add_child(struct func_stack *stack, const char *child, int pos)
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| 54 | {
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| 55 | int i;
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| 56 |
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| 57 | if (!child)
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| 58 | return;
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| 59 |
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| 60 | if (pos < stack->size)
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| 61 | free(stack->stack[pos]);
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| 62 | else {
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| 63 | char **ptr;
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| 64 |
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| 65 | ptr = realloc(stack->stack, sizeof(char *) *
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| 66 | (stack->size + STK_BLK));
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| 67 | if (!ptr) {
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| 68 | warning("could not allocate plugin memory\n");
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| 69 | return;
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| 70 | }
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| 71 |
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| 72 | stack->stack = ptr;
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| 73 |
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| 74 | for (i = stack->size; i < stack->size + STK_BLK; i++)
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| 75 | stack->stack[i] = NULL;
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| 76 | stack->size += STK_BLK;
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| 77 | }
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| 78 |
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| 79 | stack->stack[pos] = strdup(child);
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| 80 | }
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| 81 |
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| 82 | static int add_and_get_index(const char *parent, const char *child, int cpu)
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| 83 | {
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| 84 | int i;
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| 85 |
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| 86 | if (cpu < 0)
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| 87 | return 0;
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| 88 |
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| 89 | if (cpu > cpus) {
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| 90 | struct func_stack *ptr;
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| 91 |
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| 92 | ptr = realloc(fstack, sizeof(*fstack) * (cpu + 1));
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| 93 | if (!ptr) {
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| 94 | warning("could not allocate plugin memory\n");
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| 95 | return 0;
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| 96 | }
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| 97 |
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| 98 | fstack = ptr;
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| 99 |
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| 100 |
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| 101 | for (i = cpus + 1; i <= cpu; i++)
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| 102 | memset(&fstack[i], 0, sizeof(fstack[i]));
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| 103 | cpus = cpu;
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| 104 | }
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| 105 |
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| 106 | for (i = 0; i < fstack[cpu].size && fstack[cpu].stack[i]; i++) {
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| 107 | if (strcmp(parent, fstack[cpu].stack[i]) == 0) {
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| 108 | add_child(&fstack[cpu], child, i+1);
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| 109 | return i;
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| 110 | }
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| 111 | }
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| 112 |
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| 113 |
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| 114 | add_child(&fstack[cpu], parent, 0);
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| 115 | add_child(&fstack[cpu], child, 1);
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| 116 | return 0;
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| 117 | }
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| 118 |
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| 119 | static void show_function(struct trace_seq *s, struct tep_handle *tep,
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| 120 | const char *func, unsigned long long function)
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| 121 | {
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| 122 | unsigned long long offset;
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| 123 |
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| 124 | trace_seq_printf(s, "%s", func);
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| 125 | if (ftrace_offset->set) {
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| 126 | offset = tep_find_function_address(tep, function);
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| 127 | trace_seq_printf(s, "+0x%x ", (int)(function - offset));
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| 128 | }
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| 129 | }
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| 130 |
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| 131 | static int function_handler(struct trace_seq *s, struct tep_record *record,
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| 132 | struct tep_event *event, void *context)
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| 133 | {
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| 134 | struct tep_handle *tep = event->tep;
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| 135 | unsigned long long function;
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| 136 | unsigned long long pfunction;
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| 137 | const char *func;
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| 138 | const char *parent;
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| 139 | int index = 0;
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| 140 |
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| 141 | if (tep_get_field_val(s, event, "ip", record, &function, 1))
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| 142 | return trace_seq_putc(s, '!');
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| 143 |
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| 144 | func = tep_find_function(tep, function);
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| 145 |
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| 146 | if (tep_get_field_val(s, event, "parent_ip", record, &pfunction, 1))
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| 147 | return trace_seq_putc(s, '!');
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| 148 |
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| 149 | parent = tep_find_function(tep, pfunction);
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| 150 |
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| 151 | if (parent && ftrace_indent->set)
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| 152 | index = add_and_get_index(parent, func, record->cpu);
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| 153 |
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| 154 | trace_seq_printf(s, "%*s", index*3, "");
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| 155 |
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| 156 | if (func)
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| 157 | show_function(s, tep, func, function);
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| 158 | else
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| 159 | trace_seq_printf(s, "0x%llx", function);
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| 160 |
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| 161 | if (ftrace_parent->set) {
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| 162 | trace_seq_printf(s, " <-- ");
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| 163 | if (parent)
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| 164 | show_function(s, tep, parent, pfunction);
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| 165 | else
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| 166 | trace_seq_printf(s, "0x%llx", pfunction);
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| 167 | }
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| 168 |
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| 169 | return 0;
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| 170 | }
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| 171 |
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| 172 | static int
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| 173 | trace_stack_handler(struct trace_seq *s, struct tep_record *record,
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| 174 | struct tep_event *event, void *context)
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| 175 | {
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| 176 | struct tep_format_field *field;
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| 177 | unsigned long long addr;
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| 178 | const char *func;
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| 179 | int long_size;
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| 180 | void *data = record->data;
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| 181 |
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| 182 | field = tep_find_any_field(event, "caller");
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| 183 | if (!field) {
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| 184 | trace_seq_printf(s, "<CANT FIND FIELD %s>", "caller");
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| 185 | return 0;
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| 186 | }
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| 187 |
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| 188 | trace_seq_puts(s, "<stack trace >\n");
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| 189 |
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| 190 | long_size = tep_get_long_size(event->tep);
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| 191 |
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| 192 | for (data += field->offset; data < record->data + record->size;
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| 193 | data += long_size) {
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| 194 | addr = tep_read_number(event->tep, data, long_size);
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| 195 |
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| 196 | if ((long_size == 8 && addr == (unsigned long long)-1) ||
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| 197 | ((int)addr == -1))
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| 198 | break;
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| 199 |
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| 200 | func = tep_find_function(event->tep, addr);
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| 201 | if (func)
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| 202 | trace_seq_printf(s, "=> %s (%llx)\n", func, addr);
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| 203 | else
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| 204 | trace_seq_printf(s, "=> %llx\n", addr);
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| 205 | }
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| 206 |
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| 207 | return 0;
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| 208 | }
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| 209 |
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| 210 | static int
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| 211 | trace_raw_data_handler(struct trace_seq *s, struct tep_record *record,
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| 212 | struct tep_event *event, void *context)
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| 213 | {
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| 214 | struct tep_format_field *field;
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| 215 | unsigned long long id;
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| 216 | int long_size;
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| 217 | void *data = record->data;
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| 218 |
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| 219 | if (tep_get_field_val(s, event, "id", record, &id, 1))
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| 220 | return trace_seq_putc(s, '!');
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| 221 |
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| 222 | trace_seq_printf(s, "# %llx", id);
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| 223 |
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| 224 | field = tep_find_any_field(event, "buf");
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| 225 | if (!field) {
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| 226 | trace_seq_printf(s, "<CANT FIND FIELD %s>", "buf");
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| 227 | return 0;
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| 228 | }
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| 229 |
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| 230 | long_size = tep_get_long_size(event->tep);
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| 231 |
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| 232 | for (data += field->offset; data < record->data + record->size;
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| 233 | data += long_size) {
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| 234 | int size = sizeof(long);
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| 235 | int left = (record->data + record->size) - data;
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| 236 | int i;
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| 237 |
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| 238 | if (size > left)
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| 239 | size = left;
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| 240 |
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| 241 | for (i = 0; i < size; i++)
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| 242 | trace_seq_printf(s, " %02x", *(unsigned char *)(data + i));
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| 243 | }
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| 244 |
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| 245 | return 0;
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| 246 | }
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| 247 |
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| 248 | int TEP_PLUGIN_LOADER(struct tep_handle *tep)
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| 249 | {
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| 250 | tep_register_event_handler(tep, -1, "ftrace", "function",
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| 251 | function_handler, NULL);
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| 252 |
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| 253 | tep_register_event_handler(tep, -1, "ftrace", "kernel_stack",
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| 254 | trace_stack_handler, NULL);
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| 255 |
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| 256 | tep_register_event_handler(tep, -1, "ftrace", "raw_data",
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| 257 | trace_raw_data_handler, NULL);
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| 258 |
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| 259 | tep_plugin_add_options("ftrace", plugin_options);
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| 260 |
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| 261 | return 0;
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| 262 | }
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| 263 |
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| 264 | void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
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| 265 | {
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| 266 | int i, x;
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| 267 |
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| 268 | tep_unregister_event_handler(tep, -1, "ftrace", "function",
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| 269 | function_handler, NULL);
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| 270 |
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| 271 | for (i = 0; i <= cpus; i++) {
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| 272 | for (x = 0; x < fstack[i].size && fstack[i].stack[x]; x++)
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| 273 | free(fstack[i].stack[x]);
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| 274 | free(fstack[i].stack);
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| 275 | }
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| 276 |
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| 277 | tep_plugin_remove_options(plugin_options);
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| 278 |
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| 279 | free(fstack);
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| 280 | fstack = NULL;
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| 281 | cpus = -1;
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| 282 | }
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