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Diffstat (limited to 'tools/perf/util/probe-event.c')
-rw-r--r--tools/perf/util/probe-event.c140
1 files changed, 120 insertions, 20 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 914c67095d9..4445a1e7052 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -195,6 +195,65 @@ static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
return ntevs;
}
+/*
+ * Find a src file from a DWARF tag path. Prepend optional source path prefix
+ * and chop off leading directories that do not exist. Result is passed back as
+ * a newly allocated path on success.
+ * Return 0 if file was found and readable, -errno otherwise.
+ */
+static int get_real_path(const char *raw_path, const char *comp_dir,
+ char **new_path)
+{
+ const char *prefix = symbol_conf.source_prefix;
+
+ if (!prefix) {
+ if (raw_path[0] != '/' && comp_dir)
+ /* If not an absolute path, try to use comp_dir */
+ prefix = comp_dir;
+ else {
+ if (access(raw_path, R_OK) == 0) {
+ *new_path = strdup(raw_path);
+ return 0;
+ } else
+ return -errno;
+ }
+ }
+
+ *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2));
+ if (!*new_path)
+ return -ENOMEM;
+
+ for (;;) {
+ sprintf(*new_path, "%s/%s", prefix, raw_path);
+
+ if (access(*new_path, R_OK) == 0)
+ return 0;
+
+ if (!symbol_conf.source_prefix)
+ /* In case of searching comp_dir, don't retry */
+ return -errno;
+
+ switch (errno) {
+ case ENAMETOOLONG:
+ case ENOENT:
+ case EROFS:
+ case EFAULT:
+ raw_path = strchr(++raw_path, '/');
+ if (!raw_path) {
+ free(*new_path);
+ *new_path = NULL;
+ return -ENOENT;
+ }
+ continue;
+
+ default:
+ free(*new_path);
+ *new_path = NULL;
+ return -errno;
+ }
+ }
+}
+
#define LINEBUF_SIZE 256
#define NR_ADDITIONAL_LINES 2
@@ -244,6 +303,7 @@ int show_line_range(struct line_range *lr)
struct line_node *ln;
FILE *fp;
int fd, ret;
+ char *tmp;
/* Search a line range */
ret = init_vmlinux();
@@ -266,6 +326,15 @@ int show_line_range(struct line_range *lr)
return ret;
}
+ /* Convert source file path */
+ tmp = lr->path;
+ ret = get_real_path(tmp, lr->comp_dir, &lr->path);
+ free(tmp); /* Free old path */
+ if (ret < 0) {
+ pr_warning("Failed to find source file. (%d)\n", ret);
+ return ret;
+ }
+
setup_pager();
if (lr->function)
@@ -557,7 +626,7 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
/* Parse perf-probe event argument */
static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
{
- char *tmp;
+ char *tmp, *goodname;
struct perf_probe_arg_field **fieldp;
pr_debug("parsing arg: %s into ", str);
@@ -580,7 +649,7 @@ static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
pr_debug("type:%s ", arg->type);
}
- tmp = strpbrk(str, "-.");
+ tmp = strpbrk(str, "-.[");
if (!is_c_varname(str) || !tmp) {
/* A variable, register, symbol or special value */
arg->var = strdup(str);
@@ -590,10 +659,11 @@ static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
return 0;
}
- /* Structure fields */
+ /* Structure fields or array element */
arg->var = strndup(str, tmp - str);
if (arg->var == NULL)
return -ENOMEM;
+ goodname = arg->var;
pr_debug("%s, ", arg->var);
fieldp = &arg->field;
@@ -601,22 +671,38 @@ static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
*fieldp = zalloc(sizeof(struct perf_probe_arg_field));
if (*fieldp == NULL)
return -ENOMEM;
- if (*tmp == '.') {
- str = tmp + 1;
- (*fieldp)->ref = false;
- } else if (tmp[1] == '>') {
- str = tmp + 2;
+ if (*tmp == '[') { /* Array */
+ str = tmp;
+ (*fieldp)->index = strtol(str + 1, &tmp, 0);
(*fieldp)->ref = true;
- } else {
- semantic_error("Argument parse error: %s\n", str);
- return -EINVAL;
+ if (*tmp != ']' || tmp == str + 1) {
+ semantic_error("Array index must be a"
+ " number.\n");
+ return -EINVAL;
+ }
+ tmp++;
+ if (*tmp == '\0')
+ tmp = NULL;
+ } else { /* Structure */
+ if (*tmp == '.') {
+ str = tmp + 1;
+ (*fieldp)->ref = false;
+ } else if (tmp[1] == '>') {
+ str = tmp + 2;
+ (*fieldp)->ref = true;
+ } else {
+ semantic_error("Argument parse error: %s\n",
+ str);
+ return -EINVAL;
+ }
+ tmp = strpbrk(str, "-.[");
}
-
- tmp = strpbrk(str, "-.");
if (tmp) {
(*fieldp)->name = strndup(str, tmp - str);
if ((*fieldp)->name == NULL)
return -ENOMEM;
+ if (*str != '[')
+ goodname = (*fieldp)->name;
pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
fieldp = &(*fieldp)->next;
}
@@ -624,11 +710,13 @@ static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
(*fieldp)->name = strdup(str);
if ((*fieldp)->name == NULL)
return -ENOMEM;
+ if (*str != '[')
+ goodname = (*fieldp)->name;
pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
- /* If no name is specified, set the last field name */
+ /* If no name is specified, set the last field name (not array index)*/
if (!arg->name) {
- arg->name = strdup((*fieldp)->name);
+ arg->name = strdup(goodname);
if (arg->name == NULL)
return -ENOMEM;
}
@@ -776,8 +864,11 @@ int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
len -= ret;
while (field) {
- ret = e_snprintf(tmp, len, "%s%s", field->ref ? "->" : ".",
- field->name);
+ if (field->name[0] == '[')
+ ret = e_snprintf(tmp, len, "%s", field->name);
+ else
+ ret = e_snprintf(tmp, len, "%s%s",
+ field->ref ? "->" : ".", field->name);
if (ret <= 0)
goto error;
tmp += ret;
@@ -904,6 +995,7 @@ out:
static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg,
char *buf, size_t buflen)
{
+ struct kprobe_trace_arg_ref *ref = arg->ref;
int ret, depth = 0;
char *tmp = buf;
@@ -917,16 +1009,24 @@ static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg,
buf += ret;
buflen -= ret;
+ /* Special case: @XXX */
+ if (arg->value[0] == '@' && arg->ref)
+ ref = ref->next;
+
/* Dereferencing arguments */
- if (arg->ref) {
- depth = __synthesize_kprobe_trace_arg_ref(arg->ref, &buf,
+ if (ref) {
+ depth = __synthesize_kprobe_trace_arg_ref(ref, &buf,
&buflen, 1);
if (depth < 0)
return depth;
}
/* Print argument value */
- ret = e_snprintf(buf, buflen, "%s", arg->value);
+ if (arg->value[0] == '@' && arg->ref)
+ ret = e_snprintf(buf, buflen, "%s%+ld", arg->value,
+ arg->ref->offset);
+ else
+ ret = e_snprintf(buf, buflen, "%s", arg->value);
if (ret < 0)
return ret;
buf += ret;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-04-13 09:46:55 +0000