From b22da3d8526a935aa31e086e63f60ff3246cb61c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 09 Dec 2023 07:24:11 +0000
Subject: [PATCH] add stmac read mac form eeprom
---
kernel/tools/perf/util/probe-finder.c | 248 ++++++++++++++++++++++++++++++++++++++++++-------
1 files changed, 213 insertions(+), 35 deletions(-)
diff --git a/kernel/tools/perf/util/probe-finder.c b/kernel/tools/perf/util/probe-finder.c
index 4da4ec2..fdafbfc 100644
--- a/kernel/tools/perf/util/probe-finder.c
+++ b/kernel/tools/perf/util/probe-finder.c
@@ -1,22 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* probe-finder.c : C expression to kprobe event converter
*
* Written by Masami Hiramatsu <mhiramat@redhat.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
*/
#include <inttypes.h>
@@ -33,16 +19,21 @@
#include <dwarf-regs.h>
#include <linux/bitops.h>
+#include <linux/zalloc.h>
#include "event.h"
#include "dso.h"
#include "debug.h"
#include "intlist.h"
-#include "util.h"
+#include "strbuf.h"
#include "strlist.h"
#include "symbol.h"
#include "probe-finder.h"
#include "probe-file.h"
#include "string2.h"
+
+#ifdef HAVE_DEBUGINFOD_SUPPORT
+#include <elfutils/debuginfod.h>
+#endif
/* Kprobe tracer basic type is up to u64 */
#define MAX_BASIC_TYPE_BITS 64
@@ -64,6 +55,7 @@
static int debuginfo__init_offline_dwarf(struct debuginfo *dbg,
const char *path)
{
+ GElf_Addr dummy;
int fd;
fd = open(path, O_RDONLY);
@@ -82,6 +74,8 @@
dbg->dbg = dwfl_module_getdwarf(dbg->mod, &dbg->bias);
if (!dbg->dbg)
goto error;
+
+ dwfl_module_build_id(dbg->mod, &dbg->build_id, &dummy);
dwfl_report_end(dbg->dwfl, NULL, NULL);
@@ -191,6 +185,20 @@
if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL)
goto static_var;
+ /* Constant value */
+ if (dwarf_attr(vr_die, DW_AT_const_value, &attr) &&
+ immediate_value_is_supported()) {
+ Dwarf_Sword snum;
+
+ if (!tvar)
+ return 0;
+
+ dwarf_formsdata(&attr, &snum);
+ ret = asprintf(&tvar->value, "\\%ld", (long)snum);
+
+ return ret < 0 ? -ENOMEM : 0;
+ }
+
/* TODO: handle more than 1 exprs */
if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
return -EINVAL; /* Broken DIE ? */
@@ -295,7 +303,7 @@
static int convert_variable_type(Dwarf_Die *vr_die,
struct probe_trace_arg *tvar,
- const char *cast)
+ const char *cast, bool user_access)
{
struct probe_trace_arg_ref **ref_ptr = &tvar->ref;
Dwarf_Die type;
@@ -306,7 +314,8 @@
char prefix;
/* TODO: check all types */
- if (cast && strcmp(cast, "string") != 0 && strcmp(cast, "x") != 0 &&
+ if (cast && strcmp(cast, "string") != 0 && strcmp(cast, "ustring") &&
+ strcmp(cast, "x") != 0 &&
strcmp(cast, "s") != 0 && strcmp(cast, "u") != 0) {
/* Non string type is OK */
/* and respect signedness/hexadecimal cast */
@@ -335,7 +344,8 @@
pr_debug("%s type is %s.\n",
dwarf_diename(vr_die), dwarf_diename(&type));
- if (cast && strcmp(cast, "string") == 0) { /* String type */
+ if (cast && (!strcmp(cast, "string") || !strcmp(cast, "ustring"))) {
+ /* String type */
ret = dwarf_tag(&type);
if (ret != DW_TAG_pointer_type &&
ret != DW_TAG_array_type) {
@@ -358,6 +368,7 @@
pr_warning("Out of memory error\n");
return -ENOMEM;
}
+ (*ref_ptr)->user_access = user_access;
}
if (!die_compare_name(&type, "char") &&
!die_compare_name(&type, "unsigned char")) {
@@ -412,7 +423,7 @@
static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname,
struct perf_probe_arg_field *field,
struct probe_trace_arg_ref **ref_ptr,
- Dwarf_Die *die_mem)
+ Dwarf_Die *die_mem, bool user_access)
{
struct probe_trace_arg_ref *ref = *ref_ptr;
Dwarf_Die type;
@@ -449,6 +460,7 @@
*ref_ptr = ref;
}
ref->offset += dwarf_bytesize(&type) * field->index;
+ ref->user_access = user_access;
goto next;
} else if (tag == DW_TAG_pointer_type) {
/* Check the pointer and dereference */
@@ -520,19 +532,28 @@
}
}
ref->offset += (long)offs;
+ ref->user_access = user_access;
/* If this member is unnamed, we need to reuse this field */
if (!dwarf_diename(die_mem))
return convert_variable_fields(die_mem, varname, field,
- &ref, die_mem);
+ &ref, die_mem, user_access);
next:
/* Converting next field */
if (field->next)
return convert_variable_fields(die_mem, field->name,
- field->next, &ref, die_mem);
+ field->next, &ref, die_mem, user_access);
else
return 0;
+}
+
+static void print_var_not_found(const char *varname)
+{
+ pr_err("Failed to find the location of the '%s' variable at this address.\n"
+ " Perhaps it has been optimized out.\n"
+ " Use -V with the --range option to show '%s' location range.\n",
+ varname, varname);
}
/* Show a variables in kprobe event format */
@@ -546,21 +567,22 @@
ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops,
&pf->sp_die, pf->machine, pf->tvar);
+ if (ret == -ENOENT && pf->skip_empty_arg)
+ /* This can be found in other place. skip it */
+ return 0;
if (ret == -ENOENT || ret == -EINVAL) {
- pr_err("Failed to find the location of the '%s' variable at this address.\n"
- " Perhaps it has been optimized out.\n"
- " Use -V with the --range option to show '%s' location range.\n",
- pf->pvar->var, pf->pvar->var);
+ print_var_not_found(pf->pvar->var);
} else if (ret == -ENOTSUP)
pr_err("Sorry, we don't support this variable location yet.\n");
else if (ret == 0 && pf->pvar->field) {
ret = convert_variable_fields(vr_die, pf->pvar->var,
pf->pvar->field, &pf->tvar->ref,
- &die_mem);
+ &die_mem, pf->pvar->user_access);
vr_die = &die_mem;
}
if (ret == 0)
- ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type);
+ ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type,
+ pf->pvar->user_access);
/* *expr will be cached in libdw. Don't free it. */
return ret;
}
@@ -596,6 +618,8 @@
/* Search again in global variables */
if (!die_find_variable_at(&pf->cu_die, pf->pvar->var,
0, &vr_die)) {
+ if (pf->skip_empty_arg)
+ return 0;
pr_warning("Failed to find '%s' in this function.\n",
pf->pvar->var);
ret = -ENOENT;
@@ -790,6 +814,39 @@
return fsp.found ? die_mem : NULL;
}
+static int verify_representive_line(struct probe_finder *pf, const char *fname,
+ int lineno, Dwarf_Addr addr)
+{
+ const char *__fname, *__func = NULL;
+ Dwarf_Die die_mem;
+ int __lineno;
+
+ /* Verify line number and address by reverse search */
+ if (cu_find_lineinfo(&pf->cu_die, addr, &__fname, &__lineno) < 0)
+ return 0;
+
+ pr_debug2("Reversed line: %s:%d\n", __fname, __lineno);
+ if (strcmp(fname, __fname) || lineno == __lineno)
+ return 0;
+
+ pr_warning("This line is sharing the address with other lines.\n");
+
+ if (pf->pev->point.function) {
+ /* Find best match function name and lines */
+ pf->addr = addr;
+ if (find_best_scope(pf, &die_mem)
+ && die_match_name(&die_mem, pf->pev->point.function)
+ && dwarf_decl_line(&die_mem, &lineno) == 0) {
+ __func = dwarf_diename(&die_mem);
+ __lineno -= lineno;
+ }
+ }
+ pr_warning("Please try to probe at %s:%d instead.\n",
+ __func ? : __fname, __lineno);
+
+ return -ENOENT;
+}
+
static int probe_point_line_walker(const char *fname, int lineno,
Dwarf_Addr addr, void *data)
{
@@ -799,6 +856,9 @@
if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0)
return 0;
+
+ if (verify_representive_line(pf, fname, lineno, addr))
+ return -ENOENT;
pf->addr = addr;
sc_die = find_best_scope(pf, &die_mem);
@@ -892,6 +952,8 @@
/* Find probe points from lazy pattern */
static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
{
+ struct build_id bid;
+ char sbuild_id[SBUILD_ID_SIZE] = "";
int ret = 0;
char *fpath;
@@ -899,7 +961,11 @@
const char *comp_dir;
comp_dir = cu_get_comp_dir(&pf->cu_die);
- ret = get_real_path(pf->fname, comp_dir, &fpath);
+ if (pf->dbg->build_id) {
+ build_id__init(&bid, pf->dbg->build_id, BUILD_ID_SIZE);
+ build_id__sprintf(&bid, sbuild_id);
+ }
+ ret = find_source_path(pf->fname, sbuild_id, comp_dir, &fpath);
if (ret < 0) {
pr_warning("Failed to find source file path.\n");
return ret;
@@ -1262,6 +1328,17 @@
return n;
}
+static bool trace_event_finder_overlap(struct trace_event_finder *tf)
+{
+ int i;
+
+ for (i = 0; i < tf->ntevs; i++) {
+ if (tf->pf.addr == tf->tevs[i].point.address)
+ return true;
+ }
+ return false;
+}
+
/* Add a found probe point into trace event list */
static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf)
{
@@ -1271,6 +1348,14 @@
struct probe_trace_event *tev;
struct perf_probe_arg *args = NULL;
int ret, i;
+
+ /*
+ * For some reason (e.g. different column assigned to same address)
+ * This callback can be called with the address which already passed.
+ * Ignore it first.
+ */
+ if (trace_event_finder_overlap(tf))
+ return 0;
/* Check number of tevs */
if (tf->ntevs == tf->max_tevs) {
@@ -1332,13 +1417,54 @@
return ret;
}
+static int fill_empty_trace_arg(struct perf_probe_event *pev,
+ struct probe_trace_event *tevs, int ntevs)
+{
+ char **valp;
+ char *type;
+ int i, j, ret;
+
+ if (!ntevs)
+ return -ENOENT;
+
+ for (i = 0; i < pev->nargs; i++) {
+ type = NULL;
+ for (j = 0; j < ntevs; j++) {
+ if (tevs[j].args[i].value) {
+ type = tevs[j].args[i].type;
+ break;
+ }
+ }
+ if (j == ntevs) {
+ print_var_not_found(pev->args[i].var);
+ return -ENOENT;
+ }
+ for (j = 0; j < ntevs; j++) {
+ valp = &tevs[j].args[i].value;
+ if (*valp)
+ continue;
+
+ ret = asprintf(valp, "\\%lx", probe_conf.magic_num);
+ if (ret < 0)
+ return -ENOMEM;
+ /* Note that type can be NULL */
+ if (type) {
+ tevs[j].args[i].type = strdup(type);
+ if (!tevs[j].args[i].type)
+ return -ENOMEM;
+ }
+ }
+ }
+ return 0;
+}
+
/* Find probe_trace_events specified by perf_probe_event from debuginfo */
int debuginfo__find_trace_events(struct debuginfo *dbg,
struct perf_probe_event *pev,
struct probe_trace_event **tevs)
{
struct trace_event_finder tf = {
- .pf = {.pev = pev, .callback = add_probe_trace_event},
+ .pf = {.pev = pev, .dbg = dbg, .callback = add_probe_trace_event},
.max_tevs = probe_conf.max_probes, .mod = dbg->mod};
int ret, i;
@@ -1350,7 +1476,13 @@
tf.tevs = *tevs;
tf.ntevs = 0;
+ if (pev->nargs != 0 && immediate_value_is_supported())
+ tf.pf.skip_empty_arg = true;
+
ret = debuginfo__find_probes(dbg, &tf.pf);
+ if (ret >= 0 && tf.pf.skip_empty_arg)
+ ret = fill_empty_trace_arg(pev, tf.tevs, tf.ntevs);
+
if (ret < 0 || tf.ntevs == 0) {
for (i = 0; i < tf.ntevs; i++)
clear_probe_trace_event(&tf.tevs[i]);
@@ -1502,7 +1634,7 @@
struct variable_list **vls)
{
struct available_var_finder af = {
- .pf = {.pev = pev, .callback = add_available_vars},
+ .pf = {.pev = pev, .dbg = dbg, .callback = add_available_vars},
.mod = dbg->mod,
.max_vls = probe_conf.max_probes};
int ret;
@@ -1693,10 +1825,17 @@
void *data)
{
struct line_finder *lf = data;
+ const char *__fname;
+ int __lineno;
int err;
if ((strtailcmp(fname, lf->fname) != 0) ||
(lf->lno_s > lineno || lf->lno_e < lineno))
+ return 0;
+
+ /* Make sure this line can be reversable */
+ if (cu_find_lineinfo(&lf->cu_die, addr, &__fname, &__lineno) > 0
+ && (lineno != __lineno || strcmp(fname, __fname)))
return 0;
err = line_range_add_line(fname, lineno, lf->lr);
@@ -1749,8 +1888,7 @@
if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die)))
return DWARF_CB_OK;
- if (die_is_func_def(sp_die) &&
- die_match_name(sp_die, lr->function)) {
+ if (die_match_name(sp_die, lr->function) && die_is_func_def(sp_die)) {
lf->fname = dwarf_decl_file(sp_die);
dwarf_decl_line(sp_die, &lr->offset);
pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset);
@@ -1850,17 +1988,57 @@
return (ret < 0) ? ret : lf.found;
}
+#ifdef HAVE_DEBUGINFOD_SUPPORT
+/* debuginfod doesn't require the comp_dir but buildid is required */
+static int get_source_from_debuginfod(const char *raw_path,
+ const char *sbuild_id, char **new_path)
+{
+ debuginfod_client *c = debuginfod_begin();
+ const char *p = raw_path;
+ int fd;
+
+ if (!c)
+ return -ENOMEM;
+
+ fd = debuginfod_find_source(c, (const unsigned char *)sbuild_id,
+ 0, p, new_path);
+ pr_debug("Search %s from debuginfod -> %d\n", p, fd);
+ if (fd >= 0)
+ close(fd);
+ debuginfod_end(c);
+ if (fd < 0) {
+ pr_debug("Failed to find %s in debuginfod (%s)\n",
+ raw_path, sbuild_id);
+ return -ENOENT;
+ }
+ pr_debug("Got a source %s\n", *new_path);
+
+ return 0;
+}
+#else
+static inline int get_source_from_debuginfod(const char *raw_path __maybe_unused,
+ const char *sbuild_id __maybe_unused,
+ char **new_path __maybe_unused)
+{
+ return -ENOTSUP;
+}
+#endif
/*
* 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.
*/
-int get_real_path(const char *raw_path, const char *comp_dir,
- char **new_path)
+int find_source_path(const char *raw_path, const char *sbuild_id,
+ const char *comp_dir, char **new_path)
{
const char *prefix = symbol_conf.source_prefix;
+ if (sbuild_id && !prefix) {
+ if (!get_source_from_debuginfod(raw_path, sbuild_id, new_path))
+ return 0;
+ }
+
if (!prefix) {
if (raw_path[0] != '/' && comp_dir)
/* If not an absolute path, try to use comp_dir */
--
Gitblit v1.6.2