mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
To fix this confusing warning: # perf probe -l Failed to find debug information for address 798240 probe_main:prometheus_new_counter__return (on github.com/prometheus/client_golang/prometheus.NewCounter%return in /home/acme/git/prometheus-uprobes/main with counter) # As that 798240 is printed with PRIx64 but has no letters, better print the 0x prefix to disambiguate. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/lkml/ZEBCyFu2GjTw6qOi@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2109 lines
52 KiB
C
2109 lines
52 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* probe-finder.c : C expression to kprobe event converter
|
|
*
|
|
* Written by Masami Hiramatsu <mhiramat@redhat.com>
|
|
*/
|
|
|
|
#include <inttypes.h>
|
|
#include <sys/utsname.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdarg.h>
|
|
#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 "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
|
|
|
|
/* Dwarf FL wrappers */
|
|
static char *debuginfo_path; /* Currently dummy */
|
|
|
|
static const Dwfl_Callbacks offline_callbacks = {
|
|
.find_debuginfo = dwfl_standard_find_debuginfo,
|
|
.debuginfo_path = &debuginfo_path,
|
|
|
|
.section_address = dwfl_offline_section_address,
|
|
|
|
/* We use this table for core files too. */
|
|
.find_elf = dwfl_build_id_find_elf,
|
|
};
|
|
|
|
/* Get a Dwarf from offline image */
|
|
static int debuginfo__init_offline_dwarf(struct debuginfo *dbg,
|
|
const char *path)
|
|
{
|
|
GElf_Addr dummy;
|
|
int fd;
|
|
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
dbg->dwfl = dwfl_begin(&offline_callbacks);
|
|
if (!dbg->dwfl)
|
|
goto error;
|
|
|
|
dwfl_report_begin(dbg->dwfl);
|
|
dbg->mod = dwfl_report_offline(dbg->dwfl, "", "", fd);
|
|
if (!dbg->mod)
|
|
goto error;
|
|
|
|
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);
|
|
|
|
return 0;
|
|
error:
|
|
if (dbg->dwfl)
|
|
dwfl_end(dbg->dwfl);
|
|
else
|
|
close(fd);
|
|
memset(dbg, 0, sizeof(*dbg));
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
static struct debuginfo *__debuginfo__new(const char *path)
|
|
{
|
|
struct debuginfo *dbg = zalloc(sizeof(*dbg));
|
|
if (!dbg)
|
|
return NULL;
|
|
|
|
if (debuginfo__init_offline_dwarf(dbg, path) < 0)
|
|
zfree(&dbg);
|
|
if (dbg)
|
|
pr_debug("Open Debuginfo file: %s\n", path);
|
|
return dbg;
|
|
}
|
|
|
|
enum dso_binary_type distro_dwarf_types[] = {
|
|
DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
|
|
DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
|
|
DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
|
|
DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
|
|
DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
|
|
DSO_BINARY_TYPE__NOT_FOUND,
|
|
};
|
|
|
|
struct debuginfo *debuginfo__new(const char *path)
|
|
{
|
|
enum dso_binary_type *type;
|
|
char buf[PATH_MAX], nil = '\0';
|
|
struct dso *dso;
|
|
struct debuginfo *dinfo = NULL;
|
|
struct build_id bid;
|
|
|
|
/* Try to open distro debuginfo files */
|
|
dso = dso__new(path);
|
|
if (!dso)
|
|
goto out;
|
|
|
|
/* Set the build id for DSO_BINARY_TYPE__BUILDID_DEBUGINFO */
|
|
if (is_regular_file(path) && filename__read_build_id(path, &bid) > 0)
|
|
dso__set_build_id(dso, &bid);
|
|
|
|
for (type = distro_dwarf_types;
|
|
!dinfo && *type != DSO_BINARY_TYPE__NOT_FOUND;
|
|
type++) {
|
|
if (dso__read_binary_type_filename(dso, *type, &nil,
|
|
buf, PATH_MAX) < 0)
|
|
continue;
|
|
dinfo = __debuginfo__new(buf);
|
|
}
|
|
dso__put(dso);
|
|
|
|
out:
|
|
/* if failed to open all distro debuginfo, open given binary */
|
|
return dinfo ? : __debuginfo__new(path);
|
|
}
|
|
|
|
void debuginfo__delete(struct debuginfo *dbg)
|
|
{
|
|
if (dbg) {
|
|
if (dbg->dwfl)
|
|
dwfl_end(dbg->dwfl);
|
|
free(dbg);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Probe finder related functions
|
|
*/
|
|
|
|
static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs)
|
|
{
|
|
struct probe_trace_arg_ref *ref;
|
|
ref = zalloc(sizeof(struct probe_trace_arg_ref));
|
|
if (ref != NULL)
|
|
ref->offset = offs;
|
|
return ref;
|
|
}
|
|
|
|
/*
|
|
* Convert a location into trace_arg.
|
|
* If tvar == NULL, this just checks variable can be converted.
|
|
* If fentry == true and vr_die is a parameter, do heuristic search
|
|
* for the location fuzzed by function entry mcount.
|
|
*/
|
|
static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr,
|
|
Dwarf_Op *fb_ops, Dwarf_Die *sp_die,
|
|
unsigned int machine,
|
|
struct probe_trace_arg *tvar)
|
|
{
|
|
Dwarf_Attribute attr;
|
|
Dwarf_Addr tmp = 0;
|
|
Dwarf_Op *op;
|
|
size_t nops;
|
|
unsigned int regn;
|
|
Dwarf_Word offs = 0;
|
|
bool ref = false;
|
|
const char *regs;
|
|
int ret, ret2 = 0;
|
|
|
|
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 ? */
|
|
if (dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0) {
|
|
ret = dwarf_entrypc(sp_die, &tmp);
|
|
if (ret)
|
|
return -ENOENT;
|
|
|
|
if (probe_conf.show_location_range &&
|
|
(dwarf_tag(vr_die) == DW_TAG_variable)) {
|
|
ret2 = -ERANGE;
|
|
} else if (addr != tmp ||
|
|
dwarf_tag(vr_die) != DW_TAG_formal_parameter) {
|
|
return -ENOENT;
|
|
}
|
|
|
|
ret = dwarf_highpc(sp_die, &tmp);
|
|
if (ret)
|
|
return -ENOENT;
|
|
/*
|
|
* This is fuzzed by fentry mcount. We try to find the
|
|
* parameter location at the earliest address.
|
|
*/
|
|
for (addr += 1; addr <= tmp; addr++) {
|
|
if (dwarf_getlocation_addr(&attr, addr, &op,
|
|
&nops, 1) > 0)
|
|
goto found;
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
found:
|
|
if (nops == 0)
|
|
/* TODO: Support const_value */
|
|
return -ENOENT;
|
|
|
|
if (op->atom == DW_OP_addr) {
|
|
static_var:
|
|
if (!tvar)
|
|
return ret2;
|
|
/* Static variables on memory (not stack), make @varname */
|
|
ret = strlen(dwarf_diename(vr_die));
|
|
tvar->value = zalloc(ret + 2);
|
|
if (tvar->value == NULL)
|
|
return -ENOMEM;
|
|
snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die));
|
|
tvar->ref = alloc_trace_arg_ref((long)offs);
|
|
if (tvar->ref == NULL)
|
|
return -ENOMEM;
|
|
return ret2;
|
|
}
|
|
|
|
/* If this is based on frame buffer, set the offset */
|
|
if (op->atom == DW_OP_fbreg) {
|
|
if (fb_ops == NULL)
|
|
return -ENOTSUP;
|
|
ref = true;
|
|
offs = op->number;
|
|
op = &fb_ops[0];
|
|
}
|
|
|
|
if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) {
|
|
regn = op->atom - DW_OP_breg0;
|
|
offs += op->number;
|
|
ref = true;
|
|
} else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) {
|
|
regn = op->atom - DW_OP_reg0;
|
|
} else if (op->atom == DW_OP_bregx) {
|
|
regn = op->number;
|
|
offs += op->number2;
|
|
ref = true;
|
|
} else if (op->atom == DW_OP_regx) {
|
|
regn = op->number;
|
|
} else {
|
|
pr_debug("DW_OP %x is not supported.\n", op->atom);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (!tvar)
|
|
return ret2;
|
|
|
|
regs = get_dwarf_regstr(regn, machine);
|
|
if (!regs) {
|
|
/* This should be a bug in DWARF or this tool */
|
|
pr_warning("Mapping for the register number %u "
|
|
"missing on this architecture.\n", regn);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
tvar->value = strdup(regs);
|
|
if (tvar->value == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (ref) {
|
|
tvar->ref = alloc_trace_arg_ref((long)offs);
|
|
if (tvar->ref == NULL)
|
|
return -ENOMEM;
|
|
}
|
|
return ret2;
|
|
}
|
|
|
|
#define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long))
|
|
|
|
static int convert_variable_type(Dwarf_Die *vr_die,
|
|
struct probe_trace_arg *tvar,
|
|
const char *cast, bool user_access)
|
|
{
|
|
struct probe_trace_arg_ref **ref_ptr = &tvar->ref;
|
|
Dwarf_Die type;
|
|
char buf[16];
|
|
char sbuf[STRERR_BUFSIZE];
|
|
int bsize, boffs, total;
|
|
int ret;
|
|
char prefix;
|
|
|
|
/* TODO: check all types */
|
|
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 */
|
|
tvar->type = strdup(cast);
|
|
return (tvar->type == NULL) ? -ENOMEM : 0;
|
|
}
|
|
|
|
bsize = dwarf_bitsize(vr_die);
|
|
if (bsize > 0) {
|
|
/* This is a bitfield */
|
|
boffs = dwarf_bitoffset(vr_die);
|
|
total = dwarf_bytesize(vr_die);
|
|
if (boffs < 0 || total < 0)
|
|
return -ENOENT;
|
|
ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs,
|
|
BYTES_TO_BITS(total));
|
|
goto formatted;
|
|
}
|
|
|
|
if (die_get_real_type(vr_die, &type) == NULL) {
|
|
pr_warning("Failed to get a type information of %s.\n",
|
|
dwarf_diename(vr_die));
|
|
return -ENOENT;
|
|
}
|
|
|
|
pr_debug("%s type is %s.\n",
|
|
dwarf_diename(vr_die), dwarf_diename(&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) {
|
|
pr_warning("Failed to cast into string: "
|
|
"%s(%s) is not a pointer nor array.\n",
|
|
dwarf_diename(vr_die), dwarf_diename(&type));
|
|
return -EINVAL;
|
|
}
|
|
if (die_get_real_type(&type, &type) == NULL) {
|
|
pr_warning("Failed to get a type"
|
|
" information.\n");
|
|
return -ENOENT;
|
|
}
|
|
if (ret == DW_TAG_pointer_type) {
|
|
while (*ref_ptr)
|
|
ref_ptr = &(*ref_ptr)->next;
|
|
/* Add new reference with offset +0 */
|
|
*ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref));
|
|
if (*ref_ptr == NULL) {
|
|
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")) {
|
|
pr_warning("Failed to cast into string: "
|
|
"%s is not (unsigned) char *.\n",
|
|
dwarf_diename(vr_die));
|
|
return -EINVAL;
|
|
}
|
|
tvar->type = strdup(cast);
|
|
return (tvar->type == NULL) ? -ENOMEM : 0;
|
|
}
|
|
|
|
if (cast && (strcmp(cast, "u") == 0))
|
|
prefix = 'u';
|
|
else if (cast && (strcmp(cast, "s") == 0))
|
|
prefix = 's';
|
|
else if (cast && (strcmp(cast, "x") == 0) &&
|
|
probe_type_is_available(PROBE_TYPE_X))
|
|
prefix = 'x';
|
|
else
|
|
prefix = die_is_signed_type(&type) ? 's' :
|
|
probe_type_is_available(PROBE_TYPE_X) ? 'x' : 'u';
|
|
|
|
ret = dwarf_bytesize(&type);
|
|
if (ret <= 0)
|
|
/* No size ... try to use default type */
|
|
return 0;
|
|
ret = BYTES_TO_BITS(ret);
|
|
|
|
/* Check the bitwidth */
|
|
if (ret > MAX_BASIC_TYPE_BITS) {
|
|
pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n",
|
|
dwarf_diename(&type), MAX_BASIC_TYPE_BITS);
|
|
ret = MAX_BASIC_TYPE_BITS;
|
|
}
|
|
ret = snprintf(buf, 16, "%c%d", prefix, ret);
|
|
|
|
formatted:
|
|
if (ret < 0 || ret >= 16) {
|
|
if (ret >= 16)
|
|
ret = -E2BIG;
|
|
pr_warning("Failed to convert variable type: %s\n",
|
|
str_error_r(-ret, sbuf, sizeof(sbuf)));
|
|
return ret;
|
|
}
|
|
tvar->type = strdup(buf);
|
|
if (tvar->type == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
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, bool user_access)
|
|
{
|
|
struct probe_trace_arg_ref *ref = *ref_ptr;
|
|
Dwarf_Die type;
|
|
Dwarf_Word offs;
|
|
int ret, tag;
|
|
|
|
pr_debug("converting %s in %s\n", field->name, varname);
|
|
if (die_get_real_type(vr_die, &type) == NULL) {
|
|
pr_warning("Failed to get the type of %s.\n", varname);
|
|
return -ENOENT;
|
|
}
|
|
pr_debug2("Var real type: %s (%x)\n", dwarf_diename(&type),
|
|
(unsigned)dwarf_dieoffset(&type));
|
|
tag = dwarf_tag(&type);
|
|
|
|
if (field->name[0] == '[' &&
|
|
(tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) {
|
|
/* Save original type for next field or type */
|
|
memcpy(die_mem, &type, sizeof(*die_mem));
|
|
/* Get the type of this array */
|
|
if (die_get_real_type(&type, &type) == NULL) {
|
|
pr_warning("Failed to get the type of %s.\n", varname);
|
|
return -ENOENT;
|
|
}
|
|
pr_debug2("Array real type: %s (%x)\n", dwarf_diename(&type),
|
|
(unsigned)dwarf_dieoffset(&type));
|
|
if (tag == DW_TAG_pointer_type) {
|
|
ref = zalloc(sizeof(struct probe_trace_arg_ref));
|
|
if (ref == NULL)
|
|
return -ENOMEM;
|
|
if (*ref_ptr)
|
|
(*ref_ptr)->next = ref;
|
|
else
|
|
*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 */
|
|
if (!field->ref) {
|
|
pr_err("Semantic error: %s must be referred by '->'\n",
|
|
field->name);
|
|
return -EINVAL;
|
|
}
|
|
/* Get the type pointed by this pointer */
|
|
if (die_get_real_type(&type, &type) == NULL) {
|
|
pr_warning("Failed to get the type of %s.\n", varname);
|
|
return -ENOENT;
|
|
}
|
|
/* Verify it is a data structure */
|
|
tag = dwarf_tag(&type);
|
|
if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) {
|
|
pr_warning("%s is not a data structure nor a union.\n",
|
|
varname);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ref = zalloc(sizeof(struct probe_trace_arg_ref));
|
|
if (ref == NULL)
|
|
return -ENOMEM;
|
|
if (*ref_ptr)
|
|
(*ref_ptr)->next = ref;
|
|
else
|
|
*ref_ptr = ref;
|
|
} else {
|
|
/* Verify it is a data structure */
|
|
if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) {
|
|
pr_warning("%s is not a data structure nor a union.\n",
|
|
varname);
|
|
return -EINVAL;
|
|
}
|
|
if (field->name[0] == '[') {
|
|
pr_err("Semantic error: %s is not a pointer"
|
|
" nor array.\n", varname);
|
|
return -EINVAL;
|
|
}
|
|
/* While processing unnamed field, we don't care about this */
|
|
if (field->ref && dwarf_diename(vr_die)) {
|
|
pr_err("Semantic error: %s must be referred by '.'\n",
|
|
field->name);
|
|
return -EINVAL;
|
|
}
|
|
if (!ref) {
|
|
pr_warning("Structure on a register is not "
|
|
"supported yet.\n");
|
|
return -ENOTSUP;
|
|
}
|
|
}
|
|
|
|
if (die_find_member(&type, field->name, die_mem) == NULL) {
|
|
pr_warning("%s(type:%s) has no member %s.\n", varname,
|
|
dwarf_diename(&type), field->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Get the offset of the field */
|
|
if (tag == DW_TAG_union_type) {
|
|
offs = 0;
|
|
} else {
|
|
ret = die_get_data_member_location(die_mem, &offs);
|
|
if (ret < 0) {
|
|
pr_warning("Failed to get the offset of %s.\n",
|
|
field->name);
|
|
return ret;
|
|
}
|
|
}
|
|
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, user_access);
|
|
|
|
next:
|
|
/* Converting next field */
|
|
if (field->next)
|
|
return convert_variable_fields(die_mem, field->name,
|
|
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 */
|
|
static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
|
|
{
|
|
Dwarf_Die die_mem;
|
|
int ret;
|
|
|
|
pr_debug("Converting variable %s into trace event.\n",
|
|
dwarf_diename(vr_die));
|
|
|
|
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) {
|
|
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, pf->pvar->user_access);
|
|
vr_die = &die_mem;
|
|
}
|
|
if (ret == 0)
|
|
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;
|
|
}
|
|
|
|
/* Find a variable in a scope DIE */
|
|
static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf)
|
|
{
|
|
Dwarf_Die vr_die;
|
|
char *buf, *ptr;
|
|
int ret = 0;
|
|
|
|
/* Copy raw parameters */
|
|
if (!is_c_varname(pf->pvar->var))
|
|
return copy_to_probe_trace_arg(pf->tvar, pf->pvar);
|
|
|
|
if (pf->pvar->name)
|
|
pf->tvar->name = strdup(pf->pvar->name);
|
|
else {
|
|
buf = synthesize_perf_probe_arg(pf->pvar);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
ptr = strchr(buf, ':'); /* Change type separator to _ */
|
|
if (ptr)
|
|
*ptr = '_';
|
|
pf->tvar->name = buf;
|
|
}
|
|
if (pf->tvar->name == NULL)
|
|
return -ENOMEM;
|
|
|
|
pr_debug("Searching '%s' variable in context.\n", pf->pvar->var);
|
|
/* Search child die for local variables and parameters. */
|
|
if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) {
|
|
/* 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;
|
|
}
|
|
}
|
|
if (ret >= 0)
|
|
ret = convert_variable(&vr_die, pf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Convert subprogram DIE to trace point */
|
|
static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod,
|
|
Dwarf_Addr paddr, bool retprobe,
|
|
const char *function,
|
|
struct probe_trace_point *tp)
|
|
{
|
|
Dwarf_Addr eaddr;
|
|
GElf_Sym sym;
|
|
const char *symbol;
|
|
|
|
/* Verify the address is correct */
|
|
if (!dwarf_haspc(sp_die, paddr)) {
|
|
pr_warning("Specified offset is out of %s\n",
|
|
dwarf_diename(sp_die));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (dwarf_entrypc(sp_die, &eaddr) == 0) {
|
|
/* If the DIE has entrypc, use it. */
|
|
symbol = dwarf_diename(sp_die);
|
|
} else {
|
|
/* Try to get actual symbol name and address from symtab */
|
|
symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL);
|
|
eaddr = sym.st_value;
|
|
}
|
|
if (!symbol) {
|
|
pr_warning("Failed to find symbol at 0x%lx\n",
|
|
(unsigned long)paddr);
|
|
return -ENOENT;
|
|
}
|
|
|
|
tp->offset = (unsigned long)(paddr - eaddr);
|
|
tp->address = paddr;
|
|
tp->symbol = strdup(symbol);
|
|
if (!tp->symbol)
|
|
return -ENOMEM;
|
|
|
|
/* Return probe must be on the head of a subprogram */
|
|
if (retprobe) {
|
|
if (eaddr != paddr) {
|
|
pr_warning("Failed to find \"%s%%return\",\n"
|
|
" because %s is an inlined function and"
|
|
" has no return point.\n", function,
|
|
function);
|
|
return -EINVAL;
|
|
}
|
|
tp->retprobe = true;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Call probe_finder callback with scope DIE */
|
|
static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf)
|
|
{
|
|
Dwarf_Attribute fb_attr;
|
|
Dwarf_Frame *frame = NULL;
|
|
size_t nops;
|
|
int ret;
|
|
|
|
if (!sc_die) {
|
|
pr_err("Caller must pass a scope DIE. Program error.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* If not a real subprogram, find a real one */
|
|
if (!die_is_func_def(sc_die)) {
|
|
if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) {
|
|
if (die_find_tailfunc(&pf->cu_die, pf->addr, &pf->sp_die)) {
|
|
pr_warning("Ignoring tail call from %s\n",
|
|
dwarf_diename(&pf->sp_die));
|
|
return 0;
|
|
} else {
|
|
pr_warning("Failed to find probe point in any "
|
|
"functions.\n");
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
} else
|
|
memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die));
|
|
|
|
/* Get the frame base attribute/ops from subprogram */
|
|
dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr);
|
|
ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1);
|
|
if (ret <= 0 || nops == 0) {
|
|
pf->fb_ops = NULL;
|
|
#if _ELFUTILS_PREREQ(0, 142)
|
|
} else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa &&
|
|
(pf->cfi_eh != NULL || pf->cfi_dbg != NULL)) {
|
|
if ((dwarf_cfi_addrframe(pf->cfi_eh, pf->addr, &frame) != 0 &&
|
|
(dwarf_cfi_addrframe(pf->cfi_dbg, pf->addr, &frame) != 0)) ||
|
|
dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) {
|
|
pr_warning("Failed to get call frame on 0x%jx\n",
|
|
(uintmax_t)pf->addr);
|
|
free(frame);
|
|
return -ENOENT;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Call finder's callback handler */
|
|
ret = pf->callback(sc_die, pf);
|
|
|
|
/* Since *pf->fb_ops can be a part of frame. we should free it here. */
|
|
free(frame);
|
|
pf->fb_ops = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct find_scope_param {
|
|
const char *function;
|
|
const char *file;
|
|
int line;
|
|
int diff;
|
|
Dwarf_Die *die_mem;
|
|
bool found;
|
|
};
|
|
|
|
static int find_best_scope_cb(Dwarf_Die *fn_die, void *data)
|
|
{
|
|
struct find_scope_param *fsp = data;
|
|
const char *file;
|
|
int lno;
|
|
|
|
/* Skip if declared file name does not match */
|
|
if (fsp->file) {
|
|
file = die_get_decl_file(fn_die);
|
|
if (!file || strcmp(fsp->file, file) != 0)
|
|
return 0;
|
|
}
|
|
/* If the function name is given, that's what user expects */
|
|
if (fsp->function) {
|
|
if (die_match_name(fn_die, fsp->function)) {
|
|
memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
|
|
fsp->found = true;
|
|
return 1;
|
|
}
|
|
} else {
|
|
/* With the line number, find the nearest declared DIE */
|
|
dwarf_decl_line(fn_die, &lno);
|
|
if (lno < fsp->line && fsp->diff > fsp->line - lno) {
|
|
/* Keep a candidate and continue */
|
|
fsp->diff = fsp->line - lno;
|
|
memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
|
|
fsp->found = true;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Return innermost DIE */
|
|
static int find_inner_scope_cb(Dwarf_Die *fn_die, void *data)
|
|
{
|
|
struct find_scope_param *fsp = data;
|
|
|
|
memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
|
|
fsp->found = true;
|
|
return 1;
|
|
}
|
|
|
|
/* Find an appropriate scope fits to given conditions */
|
|
static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem)
|
|
{
|
|
struct find_scope_param fsp = {
|
|
.function = pf->pev->point.function,
|
|
.file = pf->fname,
|
|
.line = pf->lno,
|
|
.diff = INT_MAX,
|
|
.die_mem = die_mem,
|
|
.found = false,
|
|
};
|
|
int ret;
|
|
|
|
ret = cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb,
|
|
&fsp);
|
|
if (!ret && !fsp.found)
|
|
cu_walk_functions_at(&pf->cu_die, pf->addr,
|
|
find_inner_scope_cb, &fsp);
|
|
|
|
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)
|
|
{
|
|
struct probe_finder *pf = data;
|
|
Dwarf_Die *sc_die, die_mem;
|
|
int ret;
|
|
|
|
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);
|
|
if (!sc_die) {
|
|
pr_warning("Failed to find scope of probe point.\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
ret = call_probe_finder(sc_die, pf);
|
|
|
|
/* Continue if no error, because the line will be in inline function */
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
/* Find probe point from its line number */
|
|
static int find_probe_point_by_line(struct probe_finder *pf)
|
|
{
|
|
return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf);
|
|
}
|
|
|
|
/* Find lines which match lazy pattern */
|
|
static int find_lazy_match_lines(struct intlist *list,
|
|
const char *fname, const char *pat)
|
|
{
|
|
FILE *fp;
|
|
char *line = NULL;
|
|
size_t line_len;
|
|
ssize_t len;
|
|
int count = 0, linenum = 1;
|
|
char sbuf[STRERR_BUFSIZE];
|
|
|
|
fp = fopen(fname, "r");
|
|
if (!fp) {
|
|
pr_warning("Failed to open %s: %s\n", fname,
|
|
str_error_r(errno, sbuf, sizeof(sbuf)));
|
|
return -errno;
|
|
}
|
|
|
|
while ((len = getline(&line, &line_len, fp)) > 0) {
|
|
|
|
if (line[len - 1] == '\n')
|
|
line[len - 1] = '\0';
|
|
|
|
if (strlazymatch(line, pat)) {
|
|
intlist__add(list, linenum);
|
|
count++;
|
|
}
|
|
linenum++;
|
|
}
|
|
|
|
if (ferror(fp))
|
|
count = -errno;
|
|
free(line);
|
|
fclose(fp);
|
|
|
|
if (count == 0)
|
|
pr_debug("No matched lines found in %s.\n", fname);
|
|
return count;
|
|
}
|
|
|
|
static int probe_point_lazy_walker(const char *fname, int lineno,
|
|
Dwarf_Addr addr, void *data)
|
|
{
|
|
struct probe_finder *pf = data;
|
|
Dwarf_Die *sc_die, die_mem;
|
|
int ret;
|
|
|
|
if (!intlist__has_entry(pf->lcache, lineno) ||
|
|
strtailcmp(fname, pf->fname) != 0)
|
|
return 0;
|
|
|
|
pr_debug("Probe line found: line:%d addr:0x%llx\n",
|
|
lineno, (unsigned long long)addr);
|
|
pf->addr = addr;
|
|
pf->lno = lineno;
|
|
sc_die = find_best_scope(pf, &die_mem);
|
|
if (!sc_die) {
|
|
pr_warning("Failed to find scope of probe point.\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
ret = call_probe_finder(sc_die, pf);
|
|
|
|
/*
|
|
* Continue if no error, because the lazy pattern will match
|
|
* to other lines
|
|
*/
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
if (intlist__empty(pf->lcache)) {
|
|
const char *comp_dir;
|
|
|
|
comp_dir = cu_get_comp_dir(&pf->cu_die);
|
|
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;
|
|
}
|
|
|
|
/* Matching lazy line pattern */
|
|
ret = find_lazy_match_lines(pf->lcache, fpath,
|
|
pf->pev->point.lazy_line);
|
|
free(fpath);
|
|
if (ret <= 0)
|
|
return ret;
|
|
}
|
|
|
|
return die_walk_lines(sp_die, probe_point_lazy_walker, pf);
|
|
}
|
|
|
|
static void skip_prologue(Dwarf_Die *sp_die, struct probe_finder *pf)
|
|
{
|
|
struct perf_probe_point *pp = &pf->pev->point;
|
|
|
|
/* Not uprobe? */
|
|
if (!pf->pev->uprobes)
|
|
return;
|
|
|
|
/* Compiled with optimization? */
|
|
if (die_is_optimized_target(&pf->cu_die))
|
|
return;
|
|
|
|
/* Don't know entrypc? */
|
|
if (!pf->addr)
|
|
return;
|
|
|
|
/* Only FUNC and FUNC@SRC are eligible. */
|
|
if (!pp->function || pp->line || pp->retprobe || pp->lazy_line ||
|
|
pp->offset || pp->abs_address)
|
|
return;
|
|
|
|
/* Not interested in func parameter? */
|
|
if (!perf_probe_with_var(pf->pev))
|
|
return;
|
|
|
|
pr_info("Target program is compiled without optimization. Skipping prologue.\n"
|
|
"Probe on address 0x%" PRIx64 " to force probing at the function entry.\n\n",
|
|
pf->addr);
|
|
|
|
die_skip_prologue(sp_die, &pf->cu_die, &pf->addr);
|
|
}
|
|
|
|
static int probe_point_inline_cb(Dwarf_Die *in_die, void *data)
|
|
{
|
|
struct probe_finder *pf = data;
|
|
struct perf_probe_point *pp = &pf->pev->point;
|
|
Dwarf_Addr addr;
|
|
int ret;
|
|
|
|
if (pp->lazy_line)
|
|
ret = find_probe_point_lazy(in_die, pf);
|
|
else {
|
|
/* Get probe address */
|
|
if (die_entrypc(in_die, &addr) != 0) {
|
|
pr_warning("Failed to get entry address of %s.\n",
|
|
dwarf_diename(in_die));
|
|
return -ENOENT;
|
|
}
|
|
if (addr == 0) {
|
|
pr_debug("%s has no valid entry address. skipped.\n",
|
|
dwarf_diename(in_die));
|
|
return -ENOENT;
|
|
}
|
|
pf->addr = addr;
|
|
pf->addr += pp->offset;
|
|
pr_debug("found inline addr: 0x%jx\n",
|
|
(uintmax_t)pf->addr);
|
|
|
|
ret = call_probe_finder(in_die, pf);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Callback parameter with return value for libdw */
|
|
struct dwarf_callback_param {
|
|
void *data;
|
|
int retval;
|
|
};
|
|
|
|
/* Search function from function name */
|
|
static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
|
|
{
|
|
struct dwarf_callback_param *param = data;
|
|
struct probe_finder *pf = param->data;
|
|
struct perf_probe_point *pp = &pf->pev->point;
|
|
const char *fname;
|
|
|
|
/* Check tag and diename */
|
|
if (!die_is_func_def(sp_die) ||
|
|
!die_match_name(sp_die, pp->function))
|
|
return DWARF_CB_OK;
|
|
|
|
/* Check declared file */
|
|
fname = die_get_decl_file(sp_die);
|
|
if (!fname) {
|
|
pr_warning("A function DIE doesn't have decl_line. Maybe broken DWARF?\n");
|
|
return DWARF_CB_OK;
|
|
}
|
|
if (pp->file && fname && strtailcmp(pp->file, fname))
|
|
return DWARF_CB_OK;
|
|
|
|
pr_debug("Matched function: %s [%lx]\n", dwarf_diename(sp_die),
|
|
(unsigned long)dwarf_dieoffset(sp_die));
|
|
pf->fname = fname;
|
|
if (pp->line) { /* Function relative line */
|
|
dwarf_decl_line(sp_die, &pf->lno);
|
|
pf->lno += pp->line;
|
|
param->retval = find_probe_point_by_line(pf);
|
|
} else if (die_is_func_instance(sp_die)) {
|
|
/* Instances always have the entry address */
|
|
die_entrypc(sp_die, &pf->addr);
|
|
/* But in some case the entry address is 0 */
|
|
if (pf->addr == 0) {
|
|
pr_debug("%s has no entry PC. Skipped\n",
|
|
dwarf_diename(sp_die));
|
|
param->retval = 0;
|
|
/* Real function */
|
|
} else if (pp->lazy_line)
|
|
param->retval = find_probe_point_lazy(sp_die, pf);
|
|
else {
|
|
skip_prologue(sp_die, pf);
|
|
pf->addr += pp->offset;
|
|
/* TODO: Check the address in this function */
|
|
param->retval = call_probe_finder(sp_die, pf);
|
|
}
|
|
} else if (!probe_conf.no_inlines) {
|
|
/* Inlined function: search instances */
|
|
param->retval = die_walk_instances(sp_die,
|
|
probe_point_inline_cb, (void *)pf);
|
|
/* This could be a non-existed inline definition */
|
|
if (param->retval == -ENOENT)
|
|
param->retval = 0;
|
|
}
|
|
|
|
/* We need to find other candidates */
|
|
if (strisglob(pp->function) && param->retval >= 0) {
|
|
param->retval = 0; /* We have to clear the result */
|
|
return DWARF_CB_OK;
|
|
}
|
|
|
|
return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */
|
|
}
|
|
|
|
static int find_probe_point_by_func(struct probe_finder *pf)
|
|
{
|
|
struct dwarf_callback_param _param = {.data = (void *)pf,
|
|
.retval = 0};
|
|
dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0);
|
|
return _param.retval;
|
|
}
|
|
|
|
struct pubname_callback_param {
|
|
char *function;
|
|
char *file;
|
|
Dwarf_Die *cu_die;
|
|
Dwarf_Die *sp_die;
|
|
int found;
|
|
};
|
|
|
|
static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data)
|
|
{
|
|
struct pubname_callback_param *param = data;
|
|
const char *fname;
|
|
|
|
if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) {
|
|
if (dwarf_tag(param->sp_die) != DW_TAG_subprogram)
|
|
return DWARF_CB_OK;
|
|
|
|
if (die_match_name(param->sp_die, param->function)) {
|
|
if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die))
|
|
return DWARF_CB_OK;
|
|
|
|
if (param->file) {
|
|
fname = die_get_decl_file(param->sp_die);
|
|
if (!fname || strtailcmp(param->file, fname))
|
|
return DWARF_CB_OK;
|
|
}
|
|
|
|
param->found = 1;
|
|
return DWARF_CB_ABORT;
|
|
}
|
|
}
|
|
|
|
return DWARF_CB_OK;
|
|
}
|
|
|
|
static int debuginfo__find_probe_location(struct debuginfo *dbg,
|
|
struct probe_finder *pf)
|
|
{
|
|
struct perf_probe_point *pp = &pf->pev->point;
|
|
Dwarf_Off off, noff;
|
|
size_t cuhl;
|
|
Dwarf_Die *diep;
|
|
int ret = 0;
|
|
|
|
off = 0;
|
|
pf->lcache = intlist__new(NULL);
|
|
if (!pf->lcache)
|
|
return -ENOMEM;
|
|
|
|
/* Fastpath: lookup by function name from .debug_pubnames section */
|
|
if (pp->function && !strisglob(pp->function)) {
|
|
struct pubname_callback_param pubname_param = {
|
|
.function = pp->function,
|
|
.file = pp->file,
|
|
.cu_die = &pf->cu_die,
|
|
.sp_die = &pf->sp_die,
|
|
.found = 0,
|
|
};
|
|
struct dwarf_callback_param probe_param = {
|
|
.data = pf,
|
|
};
|
|
|
|
dwarf_getpubnames(dbg->dbg, pubname_search_cb,
|
|
&pubname_param, 0);
|
|
if (pubname_param.found) {
|
|
ret = probe_point_search_cb(&pf->sp_die, &probe_param);
|
|
if (ret)
|
|
goto found;
|
|
}
|
|
}
|
|
|
|
/* Loop on CUs (Compilation Unit) */
|
|
while (!dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
|
|
/* Get the DIE(Debugging Information Entry) of this CU */
|
|
diep = dwarf_offdie(dbg->dbg, off + cuhl, &pf->cu_die);
|
|
if (!diep) {
|
|
off = noff;
|
|
continue;
|
|
}
|
|
|
|
/* Check if target file is included. */
|
|
if (pp->file)
|
|
pf->fname = cu_find_realpath(&pf->cu_die, pp->file);
|
|
else
|
|
pf->fname = NULL;
|
|
|
|
if (!pp->file || pf->fname) {
|
|
if (pp->function)
|
|
ret = find_probe_point_by_func(pf);
|
|
else if (pp->lazy_line)
|
|
ret = find_probe_point_lazy(&pf->cu_die, pf);
|
|
else {
|
|
pf->lno = pp->line;
|
|
ret = find_probe_point_by_line(pf);
|
|
}
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
off = noff;
|
|
}
|
|
|
|
found:
|
|
intlist__delete(pf->lcache);
|
|
pf->lcache = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Find probe points from debuginfo */
|
|
static int debuginfo__find_probes(struct debuginfo *dbg,
|
|
struct probe_finder *pf)
|
|
{
|
|
int ret = 0;
|
|
Elf *elf;
|
|
GElf_Ehdr ehdr;
|
|
|
|
if (pf->cfi_eh || pf->cfi_dbg)
|
|
return debuginfo__find_probe_location(dbg, pf);
|
|
|
|
/* Get the call frame information from this dwarf */
|
|
elf = dwarf_getelf(dbg->dbg);
|
|
if (elf == NULL)
|
|
return -EINVAL;
|
|
|
|
if (gelf_getehdr(elf, &ehdr) == NULL)
|
|
return -EINVAL;
|
|
|
|
pf->machine = ehdr.e_machine;
|
|
|
|
#if _ELFUTILS_PREREQ(0, 142)
|
|
do {
|
|
GElf_Shdr shdr;
|
|
|
|
if (elf_section_by_name(elf, &ehdr, &shdr, ".eh_frame", NULL) &&
|
|
shdr.sh_type == SHT_PROGBITS)
|
|
pf->cfi_eh = dwarf_getcfi_elf(elf);
|
|
|
|
pf->cfi_dbg = dwarf_getcfi(dbg->dbg);
|
|
} while (0);
|
|
#endif
|
|
|
|
ret = debuginfo__find_probe_location(dbg, pf);
|
|
return ret;
|
|
}
|
|
|
|
struct local_vars_finder {
|
|
struct probe_finder *pf;
|
|
struct perf_probe_arg *args;
|
|
bool vars;
|
|
int max_args;
|
|
int nargs;
|
|
int ret;
|
|
};
|
|
|
|
/* Collect available variables in this scope */
|
|
static int copy_variables_cb(Dwarf_Die *die_mem, void *data)
|
|
{
|
|
struct local_vars_finder *vf = data;
|
|
struct probe_finder *pf = vf->pf;
|
|
int tag;
|
|
|
|
tag = dwarf_tag(die_mem);
|
|
if (tag == DW_TAG_formal_parameter ||
|
|
(tag == DW_TAG_variable && vf->vars)) {
|
|
if (convert_variable_location(die_mem, vf->pf->addr,
|
|
vf->pf->fb_ops, &pf->sp_die,
|
|
pf->machine, NULL) == 0) {
|
|
vf->args[vf->nargs].var = (char *)dwarf_diename(die_mem);
|
|
if (vf->args[vf->nargs].var == NULL) {
|
|
vf->ret = -ENOMEM;
|
|
return DIE_FIND_CB_END;
|
|
}
|
|
pr_debug(" %s", vf->args[vf->nargs].var);
|
|
vf->nargs++;
|
|
}
|
|
}
|
|
|
|
if (dwarf_haspc(die_mem, vf->pf->addr))
|
|
return DIE_FIND_CB_CONTINUE;
|
|
else
|
|
return DIE_FIND_CB_SIBLING;
|
|
}
|
|
|
|
static int expand_probe_args(Dwarf_Die *sc_die, struct probe_finder *pf,
|
|
struct perf_probe_arg *args)
|
|
{
|
|
Dwarf_Die die_mem;
|
|
int i;
|
|
int n = 0;
|
|
struct local_vars_finder vf = {.pf = pf, .args = args, .vars = false,
|
|
.max_args = MAX_PROBE_ARGS, .ret = 0};
|
|
|
|
for (i = 0; i < pf->pev->nargs; i++) {
|
|
/* var never be NULL */
|
|
if (strcmp(pf->pev->args[i].var, PROBE_ARG_VARS) == 0)
|
|
vf.vars = true;
|
|
else if (strcmp(pf->pev->args[i].var, PROBE_ARG_PARAMS) != 0) {
|
|
/* Copy normal argument */
|
|
args[n] = pf->pev->args[i];
|
|
n++;
|
|
continue;
|
|
}
|
|
pr_debug("Expanding %s into:", pf->pev->args[i].var);
|
|
vf.nargs = n;
|
|
/* Special local variables */
|
|
die_find_child(sc_die, copy_variables_cb, (void *)&vf,
|
|
&die_mem);
|
|
pr_debug(" (%d)\n", vf.nargs - n);
|
|
if (vf.ret < 0)
|
|
return vf.ret;
|
|
n = vf.nargs;
|
|
}
|
|
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)
|
|
{
|
|
struct trace_event_finder *tf =
|
|
container_of(pf, struct trace_event_finder, pf);
|
|
struct perf_probe_point *pp = &pf->pev->point;
|
|
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) {
|
|
pr_warning("Too many( > %d) probe point found.\n",
|
|
tf->max_tevs);
|
|
return -ERANGE;
|
|
}
|
|
tev = &tf->tevs[tf->ntevs++];
|
|
|
|
/* Trace point should be converted from subprogram DIE */
|
|
ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr,
|
|
pp->retprobe, pp->function, &tev->point);
|
|
if (ret < 0)
|
|
goto end;
|
|
|
|
tev->point.realname = strdup(dwarf_diename(sc_die));
|
|
if (!tev->point.realname) {
|
|
ret = -ENOMEM;
|
|
goto end;
|
|
}
|
|
|
|
pr_debug("Probe point found: %s+%lu\n", tev->point.symbol,
|
|
tev->point.offset);
|
|
|
|
/* Expand special probe argument if exist */
|
|
args = zalloc(sizeof(struct perf_probe_arg) * MAX_PROBE_ARGS);
|
|
if (args == NULL) {
|
|
ret = -ENOMEM;
|
|
goto end;
|
|
}
|
|
|
|
ret = expand_probe_args(sc_die, pf, args);
|
|
if (ret < 0)
|
|
goto end;
|
|
|
|
tev->nargs = ret;
|
|
tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
|
|
if (tev->args == NULL) {
|
|
ret = -ENOMEM;
|
|
goto end;
|
|
}
|
|
|
|
/* Find each argument */
|
|
for (i = 0; i < tev->nargs; i++) {
|
|
pf->pvar = &args[i];
|
|
pf->tvar = &tev->args[i];
|
|
/* Variable should be found from scope DIE */
|
|
ret = find_variable(sc_die, pf);
|
|
if (ret != 0)
|
|
break;
|
|
}
|
|
|
|
end:
|
|
if (ret) {
|
|
clear_probe_trace_event(tev);
|
|
tf->ntevs--;
|
|
}
|
|
free(args);
|
|
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, .dbg = dbg, .callback = add_probe_trace_event},
|
|
.max_tevs = probe_conf.max_probes, .mod = dbg->mod};
|
|
int ret, i;
|
|
|
|
/* Allocate result tevs array */
|
|
*tevs = zalloc(sizeof(struct probe_trace_event) * tf.max_tevs);
|
|
if (*tevs == NULL)
|
|
return -ENOMEM;
|
|
|
|
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]);
|
|
zfree(tevs);
|
|
return ret;
|
|
}
|
|
|
|
return (ret < 0) ? ret : tf.ntevs;
|
|
}
|
|
|
|
/* Collect available variables in this scope */
|
|
static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
|
|
{
|
|
struct available_var_finder *af = data;
|
|
struct variable_list *vl;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int tag, ret;
|
|
|
|
vl = &af->vls[af->nvls - 1];
|
|
|
|
tag = dwarf_tag(die_mem);
|
|
if (tag == DW_TAG_formal_parameter ||
|
|
tag == DW_TAG_variable) {
|
|
ret = convert_variable_location(die_mem, af->pf.addr,
|
|
af->pf.fb_ops, &af->pf.sp_die,
|
|
af->pf.machine, NULL);
|
|
if (ret == 0 || ret == -ERANGE) {
|
|
int ret2;
|
|
bool externs = !af->child;
|
|
|
|
if (strbuf_init(&buf, 64) < 0)
|
|
goto error;
|
|
|
|
if (probe_conf.show_location_range) {
|
|
if (!externs)
|
|
ret2 = strbuf_add(&buf,
|
|
ret ? "[INV]\t" : "[VAL]\t", 6);
|
|
else
|
|
ret2 = strbuf_add(&buf, "[EXT]\t", 6);
|
|
if (ret2)
|
|
goto error;
|
|
}
|
|
|
|
ret2 = die_get_varname(die_mem, &buf);
|
|
|
|
if (!ret2 && probe_conf.show_location_range &&
|
|
!externs) {
|
|
if (strbuf_addch(&buf, '\t') < 0)
|
|
goto error;
|
|
ret2 = die_get_var_range(&af->pf.sp_die,
|
|
die_mem, &buf);
|
|
}
|
|
|
|
pr_debug("Add new var: %s\n", buf.buf);
|
|
if (ret2 == 0) {
|
|
strlist__add(vl->vars,
|
|
strbuf_detach(&buf, NULL));
|
|
}
|
|
strbuf_release(&buf);
|
|
}
|
|
}
|
|
|
|
if (af->child && dwarf_haspc(die_mem, af->pf.addr))
|
|
return DIE_FIND_CB_CONTINUE;
|
|
else
|
|
return DIE_FIND_CB_SIBLING;
|
|
error:
|
|
strbuf_release(&buf);
|
|
pr_debug("Error in strbuf\n");
|
|
return DIE_FIND_CB_END;
|
|
}
|
|
|
|
static bool available_var_finder_overlap(struct available_var_finder *af)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < af->nvls; i++) {
|
|
if (af->pf.addr == af->vls[i].point.address)
|
|
return true;
|
|
}
|
|
return false;
|
|
|
|
}
|
|
|
|
/* Add a found vars into available variables list */
|
|
static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf)
|
|
{
|
|
struct available_var_finder *af =
|
|
container_of(pf, struct available_var_finder, pf);
|
|
struct perf_probe_point *pp = &pf->pev->point;
|
|
struct variable_list *vl;
|
|
Dwarf_Die die_mem;
|
|
int ret;
|
|
|
|
/*
|
|
* 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 (available_var_finder_overlap(af))
|
|
return 0;
|
|
|
|
/* Check number of tevs */
|
|
if (af->nvls == af->max_vls) {
|
|
pr_warning("Too many( > %d) probe point found.\n", af->max_vls);
|
|
return -ERANGE;
|
|
}
|
|
vl = &af->vls[af->nvls++];
|
|
|
|
/* Trace point should be converted from subprogram DIE */
|
|
ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr,
|
|
pp->retprobe, pp->function, &vl->point);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
pr_debug("Probe point found: %s+%lu\n", vl->point.symbol,
|
|
vl->point.offset);
|
|
|
|
/* Find local variables */
|
|
vl->vars = strlist__new(NULL, NULL);
|
|
if (vl->vars == NULL)
|
|
return -ENOMEM;
|
|
af->child = true;
|
|
die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem);
|
|
|
|
/* Find external variables */
|
|
if (!probe_conf.show_ext_vars)
|
|
goto out;
|
|
/* Don't need to search child DIE for external vars. */
|
|
af->child = false;
|
|
die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem);
|
|
|
|
out:
|
|
if (strlist__empty(vl->vars)) {
|
|
strlist__delete(vl->vars);
|
|
vl->vars = NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Find available variables at given probe point
|
|
* Return the number of found probe points. Return 0 if there is no
|
|
* matched probe point. Return <0 if an error occurs.
|
|
*/
|
|
int debuginfo__find_available_vars_at(struct debuginfo *dbg,
|
|
struct perf_probe_event *pev,
|
|
struct variable_list **vls)
|
|
{
|
|
struct available_var_finder af = {
|
|
.pf = {.pev = pev, .dbg = dbg, .callback = add_available_vars},
|
|
.mod = dbg->mod,
|
|
.max_vls = probe_conf.max_probes};
|
|
int ret;
|
|
|
|
/* Allocate result vls array */
|
|
*vls = zalloc(sizeof(struct variable_list) * af.max_vls);
|
|
if (*vls == NULL)
|
|
return -ENOMEM;
|
|
|
|
af.vls = *vls;
|
|
af.nvls = 0;
|
|
|
|
ret = debuginfo__find_probes(dbg, &af.pf);
|
|
if (ret < 0) {
|
|
/* Free vlist for error */
|
|
while (af.nvls--) {
|
|
zfree(&af.vls[af.nvls].point.symbol);
|
|
strlist__delete(af.vls[af.nvls].vars);
|
|
}
|
|
zfree(vls);
|
|
return ret;
|
|
}
|
|
|
|
return (ret < 0) ? ret : af.nvls;
|
|
}
|
|
|
|
/* For the kernel module, we need a special code to get a DIE */
|
|
int debuginfo__get_text_offset(struct debuginfo *dbg, Dwarf_Addr *offs,
|
|
bool adjust_offset)
|
|
{
|
|
int n, i;
|
|
Elf32_Word shndx;
|
|
Elf_Scn *scn;
|
|
Elf *elf;
|
|
GElf_Shdr mem, *shdr;
|
|
const char *p;
|
|
|
|
elf = dwfl_module_getelf(dbg->mod, &dbg->bias);
|
|
if (!elf)
|
|
return -EINVAL;
|
|
|
|
/* Get the number of relocations */
|
|
n = dwfl_module_relocations(dbg->mod);
|
|
if (n < 0)
|
|
return -ENOENT;
|
|
/* Search the relocation related .text section */
|
|
for (i = 0; i < n; i++) {
|
|
p = dwfl_module_relocation_info(dbg->mod, i, &shndx);
|
|
if (strcmp(p, ".text") == 0) {
|
|
/* OK, get the section header */
|
|
scn = elf_getscn(elf, shndx);
|
|
if (!scn)
|
|
return -ENOENT;
|
|
shdr = gelf_getshdr(scn, &mem);
|
|
if (!shdr)
|
|
return -ENOENT;
|
|
*offs = shdr->sh_addr;
|
|
if (adjust_offset)
|
|
*offs -= shdr->sh_offset;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Reverse search */
|
|
int debuginfo__find_probe_point(struct debuginfo *dbg, u64 addr,
|
|
struct perf_probe_point *ppt)
|
|
{
|
|
Dwarf_Die cudie, spdie, indie;
|
|
Dwarf_Addr _addr = 0, baseaddr = 0;
|
|
const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp;
|
|
int baseline = 0, lineno = 0, ret = 0;
|
|
|
|
/* We always need to relocate the address for aranges */
|
|
if (debuginfo__get_text_offset(dbg, &baseaddr, false) == 0)
|
|
addr += baseaddr;
|
|
/* Find cu die */
|
|
if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr, &cudie)) {
|
|
pr_warning("Failed to find debug information for address %#" PRIx64 "\n",
|
|
addr);
|
|
ret = -EINVAL;
|
|
goto end;
|
|
}
|
|
|
|
/* Find a corresponding line (filename and lineno) */
|
|
cu_find_lineinfo(&cudie, (Dwarf_Addr)addr, &fname, &lineno);
|
|
/* Don't care whether it failed or not */
|
|
|
|
/* Find a corresponding function (name, baseline and baseaddr) */
|
|
if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) {
|
|
/* Get function entry information */
|
|
func = basefunc = dwarf_diename(&spdie);
|
|
if (!func ||
|
|
die_entrypc(&spdie, &baseaddr) != 0 ||
|
|
dwarf_decl_line(&spdie, &baseline) != 0) {
|
|
lineno = 0;
|
|
goto post;
|
|
}
|
|
|
|
fname = die_get_decl_file(&spdie);
|
|
if (addr == baseaddr) {
|
|
/* Function entry - Relative line number is 0 */
|
|
lineno = baseline;
|
|
goto post;
|
|
}
|
|
|
|
/* Track down the inline functions step by step */
|
|
while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr,
|
|
&indie)) {
|
|
/* There is an inline function */
|
|
if (die_entrypc(&indie, &_addr) == 0 &&
|
|
_addr == addr) {
|
|
/*
|
|
* addr is at an inline function entry.
|
|
* In this case, lineno should be the call-site
|
|
* line number. (overwrite lineinfo)
|
|
*/
|
|
lineno = die_get_call_lineno(&indie);
|
|
fname = die_get_call_file(&indie);
|
|
break;
|
|
} else {
|
|
/*
|
|
* addr is in an inline function body.
|
|
* Since lineno points one of the lines
|
|
* of the inline function, baseline should
|
|
* be the entry line of the inline function.
|
|
*/
|
|
tmp = dwarf_diename(&indie);
|
|
if (!tmp ||
|
|
dwarf_decl_line(&indie, &baseline) != 0)
|
|
break;
|
|
func = tmp;
|
|
spdie = indie;
|
|
}
|
|
}
|
|
/* Verify the lineno and baseline are in a same file */
|
|
tmp = die_get_decl_file(&spdie);
|
|
if (!tmp || (fname && strcmp(tmp, fname) != 0))
|
|
lineno = 0;
|
|
}
|
|
|
|
post:
|
|
/* Make a relative line number or an offset */
|
|
if (lineno)
|
|
ppt->line = lineno - baseline;
|
|
else if (basefunc) {
|
|
ppt->offset = addr - baseaddr;
|
|
func = basefunc;
|
|
}
|
|
|
|
/* Duplicate strings */
|
|
if (func) {
|
|
ppt->function = strdup(func);
|
|
if (ppt->function == NULL) {
|
|
ret = -ENOMEM;
|
|
goto end;
|
|
}
|
|
}
|
|
if (fname) {
|
|
ppt->file = strdup(fname);
|
|
if (ppt->file == NULL) {
|
|
zfree(&ppt->function);
|
|
ret = -ENOMEM;
|
|
goto end;
|
|
}
|
|
}
|
|
end:
|
|
if (ret == 0 && (fname || func))
|
|
ret = 1; /* Found a point */
|
|
return ret;
|
|
}
|
|
|
|
/* Add a line and store the src path */
|
|
static int line_range_add_line(const char *src, unsigned int lineno,
|
|
struct line_range *lr)
|
|
{
|
|
/* Copy source path */
|
|
if (!lr->path) {
|
|
lr->path = strdup(src);
|
|
if (lr->path == NULL)
|
|
return -ENOMEM;
|
|
}
|
|
return intlist__add(lr->line_list, lineno);
|
|
}
|
|
|
|
static int line_range_walk_cb(const char *fname, int lineno,
|
|
Dwarf_Addr addr, 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 reversible */
|
|
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);
|
|
if (err < 0 && err != -EEXIST)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Find line range from its line number */
|
|
static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
|
|
{
|
|
int ret;
|
|
|
|
ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf);
|
|
|
|
/* Update status */
|
|
if (ret >= 0)
|
|
if (!intlist__empty(lf->lr->line_list))
|
|
ret = lf->found = 1;
|
|
else
|
|
ret = 0; /* Lines are not found */
|
|
else {
|
|
zfree(&lf->lr->path);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int line_range_inline_cb(Dwarf_Die *in_die, void *data)
|
|
{
|
|
int ret = find_line_range_by_line(in_die, data);
|
|
|
|
/*
|
|
* We have to check all instances of inlined function, because
|
|
* some execution paths can be optimized out depends on the
|
|
* function argument of instances. However, if an error occurs,
|
|
* it should be handled by the caller.
|
|
*/
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
/* Search function definition from function name */
|
|
static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
|
|
{
|
|
struct dwarf_callback_param *param = data;
|
|
struct line_finder *lf = param->data;
|
|
struct line_range *lr = lf->lr;
|
|
const char *fname;
|
|
|
|
/* Check declared file */
|
|
if (lr->file) {
|
|
fname = die_get_decl_file(sp_die);
|
|
if (!fname || strtailcmp(lr->file, fname))
|
|
return DWARF_CB_OK;
|
|
}
|
|
|
|
if (die_match_name(sp_die, lr->function) && die_is_func_def(sp_die)) {
|
|
lf->fname = die_get_decl_file(sp_die);
|
|
dwarf_decl_line(sp_die, &lr->offset);
|
|
pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset);
|
|
lf->lno_s = lr->offset + lr->start;
|
|
if (lf->lno_s < 0) /* Overflow */
|
|
lf->lno_s = INT_MAX;
|
|
lf->lno_e = lr->offset + lr->end;
|
|
if (lf->lno_e < 0) /* Overflow */
|
|
lf->lno_e = INT_MAX;
|
|
pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e);
|
|
lr->start = lf->lno_s;
|
|
lr->end = lf->lno_e;
|
|
if (!die_is_func_instance(sp_die))
|
|
param->retval = die_walk_instances(sp_die,
|
|
line_range_inline_cb, lf);
|
|
else
|
|
param->retval = find_line_range_by_line(sp_die, lf);
|
|
return DWARF_CB_ABORT;
|
|
}
|
|
return DWARF_CB_OK;
|
|
}
|
|
|
|
static int find_line_range_by_func(struct line_finder *lf)
|
|
{
|
|
struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0};
|
|
dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0);
|
|
return param.retval;
|
|
}
|
|
|
|
int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr)
|
|
{
|
|
struct line_finder lf = {.lr = lr, .found = 0};
|
|
int ret = 0;
|
|
Dwarf_Off off = 0, noff;
|
|
size_t cuhl;
|
|
Dwarf_Die *diep;
|
|
const char *comp_dir;
|
|
|
|
/* Fastpath: lookup by function name from .debug_pubnames section */
|
|
if (lr->function) {
|
|
struct pubname_callback_param pubname_param = {
|
|
.function = lr->function, .file = lr->file,
|
|
.cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0};
|
|
struct dwarf_callback_param line_range_param = {
|
|
.data = (void *)&lf, .retval = 0};
|
|
|
|
dwarf_getpubnames(dbg->dbg, pubname_search_cb,
|
|
&pubname_param, 0);
|
|
if (pubname_param.found) {
|
|
line_range_search_cb(&lf.sp_die, &line_range_param);
|
|
if (lf.found)
|
|
goto found;
|
|
}
|
|
}
|
|
|
|
/* Loop on CUs (Compilation Unit) */
|
|
while (!lf.found && ret >= 0) {
|
|
if (dwarf_nextcu(dbg->dbg, off, &noff, &cuhl,
|
|
NULL, NULL, NULL) != 0)
|
|
break;
|
|
|
|
/* Get the DIE(Debugging Information Entry) of this CU */
|
|
diep = dwarf_offdie(dbg->dbg, off + cuhl, &lf.cu_die);
|
|
if (!diep) {
|
|
off = noff;
|
|
continue;
|
|
}
|
|
|
|
/* Check if target file is included. */
|
|
if (lr->file)
|
|
lf.fname = cu_find_realpath(&lf.cu_die, lr->file);
|
|
else
|
|
lf.fname = 0;
|
|
|
|
if (!lr->file || lf.fname) {
|
|
if (lr->function)
|
|
ret = find_line_range_by_func(&lf);
|
|
else {
|
|
lf.lno_s = lr->start;
|
|
lf.lno_e = lr->end;
|
|
ret = find_line_range_by_line(NULL, &lf);
|
|
}
|
|
}
|
|
off = noff;
|
|
}
|
|
|
|
found:
|
|
/* Store comp_dir */
|
|
if (lf.found) {
|
|
comp_dir = cu_get_comp_dir(&lf.cu_die);
|
|
if (comp_dir) {
|
|
lr->comp_dir = strdup(comp_dir);
|
|
if (!lr->comp_dir)
|
|
ret = -ENOMEM;
|
|
}
|
|
}
|
|
|
|
pr_debug("path: %s\n", lr->path);
|
|
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 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 */
|
|
prefix = comp_dir;
|
|
else {
|
|
if (access(raw_path, R_OK) == 0) {
|
|
*new_path = strdup(raw_path);
|
|
return *new_path ? 0 : -ENOMEM;
|
|
} 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 */
|
|
zfree(new_path);
|
|
return -errno;
|
|
}
|
|
|
|
switch (errno) {
|
|
case ENAMETOOLONG:
|
|
case ENOENT:
|
|
case EROFS:
|
|
case EFAULT:
|
|
raw_path = strchr(++raw_path, '/');
|
|
if (!raw_path) {
|
|
zfree(new_path);
|
|
return -ENOENT;
|
|
}
|
|
continue;
|
|
|
|
default:
|
|
zfree(new_path);
|
|
return -errno;
|
|
}
|
|
}
|
|
}
|