#include "probe-event.h"
#include "probe-file.h"
#include "session.h"
+#include "perf_regs.h"
-#define MAX_CMDLEN 256
+/* 4096 - 2 ('\n' + '\0') */
+#define MAX_CMDLEN 4094
static void print_open_warning(int err, bool uprobe)
{
}
}
-static int open_probe_events(const char *trace_file, bool readwrite)
+int open_trace_file(const char *trace_file, bool readwrite)
{
char buf[PATH_MAX];
int ret;
static int open_kprobe_events(bool readwrite)
{
- return open_probe_events("kprobe_events", readwrite);
+ return open_trace_file("kprobe_events", readwrite);
}
static int open_uprobe_events(bool readwrite)
{
- return open_probe_events("uprobe_events", readwrite);
+ return open_trace_file("uprobe_events", readwrite);
}
int probe_file__open(int flag)
: (unsigned long long)note->addr.a64[0];
}
+static const char * const type_to_suffix[] = {
+ ":s64", "", "", "", ":s32", "", ":s16", ":s8",
+ "", ":u8", ":u16", "", ":u32", "", "", "", ":u64"
+};
+
+static int synthesize_sdt_probe_arg(struct strbuf *buf, int i, const char *arg)
+{
+ char *tmp, *desc = strdup(arg);
+ const char *prefix = "", *suffix = "";
+ int ret = -1;
+
+ if (desc == NULL) {
+ pr_debug4("Allocation error\n");
+ return ret;
+ }
+
+ tmp = strchr(desc, '@');
+ if (tmp) {
+ long type_idx;
+ /*
+ * Isolate the string number and convert it into a
+ * binary value; this will be an index to get suffix
+ * of the uprobe name (defining the type)
+ */
+ tmp[0] = '\0';
+ type_idx = strtol(desc, NULL, 10);
+ /* Check that the conversion went OK */
+ if (type_idx == LONG_MIN || type_idx == LONG_MAX) {
+ pr_debug4("Failed to parse sdt type\n");
+ goto error;
+ }
+ /* Check that the converted value is OK */
+ if (type_idx < -8 || type_idx > 8) {
+ pr_debug4("Failed to get a valid sdt type\n");
+ goto error;
+ }
+ suffix = type_to_suffix[type_idx + 8];
+ /* Get rid of the sdt prefix which is now useless */
+ tmp++;
+ memmove(desc, tmp, strlen(tmp) + 1);
+ }
+
+ /*
+ * The uprobe tracer format does not support all the
+ * addressing modes (notably: in x86 the scaled mode); so, we
+ * detect ',' characters, if there is just one, there is no
+ * use converting the sdt arg into a uprobe one.
+ */
+ if (strchr(desc, ',')) {
+ pr_debug4("Skipping unsupported SDT argument; %s\n", desc);
+ goto out;
+ }
+
+ /*
+ * If the argument addressing mode is indirect, we must check
+ * a few things...
+ */
+ tmp = strchr(desc, '(');
+ if (tmp) {
+ int j;
+
+ /*
+ * ...if the addressing mode is indirect with a
+ * positive offset (ex.: "1608(%ax)"), we need to add
+ * a '+' prefix so as to be compliant with uprobe
+ * format.
+ */
+ if (desc[0] != '+' && desc[0] != '-')
+ prefix = "+";
+
+ /*
+ * ...or if the addressing mode is indirect with a symbol
+ * as offset, the argument will not be supported by
+ * the uprobe tracer format; so, let's skip this one.
+ */
+ for (j = 0; j < tmp - desc; j++) {
+ if (desc[j] != '+' && desc[j] != '-' &&
+ !isdigit(desc[j])) {
+ pr_debug4("Skipping unsupported SDT argument; "
+ "%s\n", desc);
+ goto out;
+ }
+ }
+ }
+
+ /*
+ * The uprobe tracer format does not support constants; if we
+ * find one in the current argument, let's skip the argument.
+ */
+ if (strchr(desc, '$')) {
+ pr_debug4("Skipping unsupported SDT argument; %s\n", desc);
+ goto out;
+ }
+
+ /*
+ * The uprobe parser does not support all gas register names;
+ * so, we have to replace them (ex. for x86_64: %rax -> %ax);
+ * the loop below looks for the register names (starting with
+ * a '%' and tries to perform the needed renamings.
+ */
+ tmp = strchr(desc, '%');
+ while (tmp) {
+ size_t offset = tmp - desc;
+
+ ret = sdt_rename_register(&desc, desc + offset);
+ if (ret < 0)
+ goto error;
+
+ /*
+ * The desc pointer might have changed; so, let's not
+ * try to reuse tmp for next lookup
+ */
+ tmp = strchr(desc + offset + 1, '%');
+ }
+
+ if (strbuf_addf(buf, " arg%d=%s%s%s", i + 1, prefix, desc, suffix) < 0)
+ goto error;
+
+out:
+ ret = 0;
+error:
+ free(desc);
+ return ret;
+}
+
+static char *synthesize_sdt_probe_command(struct sdt_note *note,
+ const char *pathname,
+ const char *sdtgrp)
+{
+ struct strbuf buf;
+ char *ret = NULL, **args;
+ int i, args_count;
+
+ if (strbuf_init(&buf, 32) < 0)
+ return NULL;
+
+ if (strbuf_addf(&buf, "p:%s/%s %s:0x%llx",
+ sdtgrp, note->name, pathname,
+ sdt_note__get_addr(note)) < 0)
+ goto error;
+
+ if (!note->args)
+ goto out;
+
+ if (note->args) {
+ args = argv_split(note->args, &args_count);
+
+ for (i = 0; i < args_count; ++i) {
+ if (synthesize_sdt_probe_arg(&buf, i, args[i]) < 0)
+ goto error;
+ }
+ }
+
+out:
+ ret = strbuf_detach(&buf, NULL);
+error:
+ strbuf_release(&buf);
+ return ret;
+}
+
int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname)
{
struct probe_cache_entry *entry = NULL;
entry->pev.group = strdup(sdtgrp);
list_add_tail(&entry->node, &pcache->entries);
}
- ret = asprintf(&buf, "p:%s/%s %s:0x%llx",
- sdtgrp, note->name, pathname,
- sdt_note__get_addr(note));
- if (ret < 0)
+ buf = synthesize_sdt_probe_command(note, pathname, sdtgrp);
+ if (!buf) {
+ ret = -ENOMEM;
break;
+ }
+
strlist__add(entry->tevlist, buf);
free(buf);
entry = NULL;
return 0;
}
+enum ftrace_readme {
+ FTRACE_README_PROBE_TYPE_X = 0,
+ FTRACE_README_KRETPROBE_OFFSET,
+ FTRACE_README_END,
+};
+
static struct {
const char *pattern;
- bool avail;
- bool checked;
-} probe_type_table[] = {
-#define DEFINE_TYPE(idx, pat, def_avail) \
- [idx] = {.pattern = pat, .avail = (def_avail)}
- DEFINE_TYPE(PROBE_TYPE_U, "* u8/16/32/64,*", true),
- DEFINE_TYPE(PROBE_TYPE_S, "* s8/16/32/64,*", true),
- DEFINE_TYPE(PROBE_TYPE_X, "* x8/16/32/64,*", false),
- DEFINE_TYPE(PROBE_TYPE_STRING, "* string,*", true),
- DEFINE_TYPE(PROBE_TYPE_BITFIELD,
- "* b<bit-width>@<bit-offset>/<container-size>", true),
+ bool avail;
+} ftrace_readme_table[] = {
+#define DEFINE_TYPE(idx, pat) \
+ [idx] = {.pattern = pat, .avail = false}
+ DEFINE_TYPE(FTRACE_README_PROBE_TYPE_X, "*type: * x8/16/32/64,*"),
+ DEFINE_TYPE(FTRACE_README_KRETPROBE_OFFSET, "*place (kretprobe): *"),
};
-bool probe_type_is_available(enum probe_type type)
+static bool scan_ftrace_readme(enum ftrace_readme type)
{
+ int fd;
FILE *fp;
char *buf = NULL;
size_t len = 0;
- bool target_line = false;
- bool ret = probe_type_table[type].avail;
+ bool ret = false;
+ static bool scanned = false;
- if (type >= PROBE_TYPE_END)
- return false;
- /* We don't have to check the type which supported by default */
- if (ret || probe_type_table[type].checked)
- return ret;
+ if (scanned)
+ goto result;
- if (asprintf(&buf, "%s/README", tracing_path) < 0)
+ fd = open_trace_file("README", false);
+ if (fd < 0)
return ret;
- fp = fopen(buf, "r");
- if (!fp)
- goto end;
-
- zfree(&buf);
- while (getline(&buf, &len, fp) > 0 && !ret) {
- if (!target_line) {
- target_line = !!strstr(buf, " type: ");
- if (!target_line)
- continue;
- } else if (strstr(buf, "\t ") != buf)
- break;
- ret = strglobmatch(buf, probe_type_table[type].pattern);
+ fp = fdopen(fd, "r");
+ if (!fp) {
+ close(fd);
+ return ret;
}
- /* Cache the result */
- probe_type_table[type].checked = true;
- probe_type_table[type].avail = ret;
+
+ while (getline(&buf, &len, fp) > 0)
+ for (enum ftrace_readme i = 0; i < FTRACE_README_END; i++)
+ if (!ftrace_readme_table[i].avail)
+ ftrace_readme_table[i].avail =
+ strglobmatch(buf, ftrace_readme_table[i].pattern);
+ scanned = true;
fclose(fp);
-end:
free(buf);
- return ret;
+result:
+ if (type >= FTRACE_README_END)
+ return false;
+
+ return ftrace_readme_table[type].avail;
+}
+
+bool probe_type_is_available(enum probe_type type)
+{
+ if (type >= PROBE_TYPE_END)
+ return false;
+ else if (type == PROBE_TYPE_X)
+ return scan_ftrace_readme(FTRACE_README_PROBE_TYPE_X);
+
+ return true;
+}
+
+bool kretprobe_offset_is_supported(void)
+{
+ return scan_ftrace_readme(FTRACE_README_KRETPROBE_OFFSET);
}
projects / linux-2.6-microblaze.git / blobdiff