4 * Babeltrace - Executable and Shared Object Debug Info Reader
6 * Copyright 2015 Antoine Busque <abusque@efficios.com>
8 * Author: Antoine Busque <abusque@efficios.com>
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
39 #include <babeltrace/dwarf.h>
40 #include <babeltrace/so-info.h>
41 #include <babeltrace/crc32.h>
42 #include <babeltrace/babeltrace-internal.h>
43 #include <babeltrace/utils.h>
46 * An address printed in hex is at most 20 bytes (16 for 64-bits +
47 * leading 0x + optional leading '+' if addr is an offset + null
50 #define ADDR_STR_LEN 20
53 int so_info_init(void)
57 if (elf_version(EV_CURRENT
) == EV_NONE
) {
58 printf_debug("ELF library initialization failed: %s\n",
67 struct so_info
*so_info_create(const char *path
, uint64_t low_addr
,
68 uint64_t memsz
, bool is_pic
)
70 struct so_info
*so
= NULL
;
76 so
= g_new0(struct so_info
, 1);
81 if (opt_debug_info_target_prefix
) {
82 so
->elf_path
= g_build_path("/", opt_debug_info_target_prefix
,
85 so
->elf_path
= strdup(path
);
94 so
->low_addr
= low_addr
;
95 so
->high_addr
= so
->low_addr
+ so
->memsz
;
105 void so_info_destroy(struct so_info
*so
)
111 dwarf_end(so
->dwarf_info
);
114 free(so
->dwarf_path
);
116 free(so
->dbg_link_filename
);
118 elf_end(so
->elf_file
);
128 int so_info_set_build_id(struct so_info
*so
, uint8_t *build_id
,
131 if (!so
|| !build_id
) {
135 so
->build_id
= malloc(build_id_len
);
140 memcpy(so
->build_id
, build_id
, build_id_len
);
141 so
->build_id_len
= build_id_len
;
144 * Reset the is_elf_only flag in case it had been set
145 * previously, because we might find separate debug info using
146 * the new build id information.
148 so
->is_elf_only
= false;
158 int so_info_set_debug_link(struct so_info
*so
, char *filename
, uint32_t crc
)
160 if (!so
|| !filename
) {
164 so
->dbg_link_filename
= strdup(filename
);
165 if (!so
->dbg_link_filename
) {
169 so
->dbg_link_crc
= crc
;
172 * Reset the is_elf_only flag in case it had been set
173 * previously, because we might find separate debug info using
174 * the new build id information.
176 so
->is_elf_only
= false;
186 * Tries to read DWARF info from the location given by path, and
187 * attach it to the given so_info instance if it exists.
189 * @param so so_info instance for which to set DWARF info
190 * @param path Presumed location of the DWARF info
191 * @returns 0 on success, -1 on failure
194 int so_info_set_dwarf_info_from_path(struct so_info
*so
, char *path
)
196 int fd
= -1, ret
= 0;
197 struct bt_dwarf_cu
*cu
= NULL
;
198 Dwarf
*dwarf_info
= NULL
;
204 fd
= open(path
, O_RDONLY
);
209 dwarf_info
= dwarf_begin(fd
, DWARF_C_READ
);
215 * Check if the dwarf info has any CU. If not, the SO's object
216 * file contains no DWARF info.
218 cu
= bt_dwarf_cu_create(dwarf_info
);
223 ret
= bt_dwarf_cu_next(cu
);
229 so
->dwarf_path
= strdup(path
);
230 if (!so
->dwarf_path
) {
233 so
->dwarf_info
= dwarf_info
;
240 dwarf_end(dwarf_info
);
248 * Try to set the dwarf_info for a given so_info instance via the
251 * @param so so_info instance for which to retrieve the
252 * DWARF info via build ID
253 * @returns 0 on success (i.e. dwarf_info set), -1 on failure
256 int so_info_set_dwarf_info_build_id(struct so_info
*so
)
259 char *path
= NULL
, *build_id_file
= NULL
;
260 const char *dbg_dir
= NULL
;
261 size_t build_id_file_len
;
263 if (!so
|| !so
->build_id
) {
267 dbg_dir
= opt_debug_info_dir
? : DEFAULT_DEBUG_DIR
;
269 /* 2 characters per byte printed in hex, +1 for '/' and +1 for
271 build_id_file_len
= (2 * so
->build_id_len
) + 1 +
272 strlen(BUILD_ID_SUFFIX
) + 1;
273 build_id_file
= malloc(build_id_file_len
);
274 if (!build_id_file
) {
278 snprintf(build_id_file
, 4, "%02x/", so
->build_id
[0]);
279 for (i
= 1; i
< so
->build_id_len
; ++i
) {
280 int path_idx
= 3 + 2 * (i
- 1);
282 snprintf(&build_id_file
[path_idx
], 3, "%02x", so
->build_id
[i
]);
284 strcat(build_id_file
, BUILD_ID_SUFFIX
);
286 path
= g_build_path("/", dbg_dir
, BUILD_ID_SUBDIR
, build_id_file
, NULL
);
291 ret
= so_info_set_dwarf_info_from_path(so
, path
);
308 * Tests whether the file located at path exists and has the expected
311 * This predicate is used when looking up separate debug info via the
312 * GNU debuglink method. The expected crc can be found .gnu_debuglink
313 * section in the original ELF file, along with the filename for the
314 * file containing the debug info.
316 * @param path Full path at which to look for the debug file
317 * @param crc Expected checksum for the debug file
318 * @returns 1 if the file exists and has the correct checksum,
322 int is_valid_debug_file(char *path
, uint32_t crc
)
324 int ret
= 0, fd
= -1;
331 fd
= open(path
, O_RDONLY
);
336 ret
= crc32(fd
, &_crc
);
350 * Try to set the dwarf_info for a given so_info instance via the
353 * @param so so_info instance for which to retrieve the
354 * DWARF info via debug link
355 * @returns 0 on success (i.e. dwarf_info set), -1 on failure
358 int so_info_set_dwarf_info_debug_link(struct so_info
*so
)
361 const char *dbg_dir
= NULL
;
362 char *dir_name
= NULL
, *so_dir
= NULL
, *path
= NULL
;
363 size_t max_path_len
= 0;
365 if (!so
|| !so
->dbg_link_filename
) {
369 dbg_dir
= opt_debug_info_dir
? : DEFAULT_DEBUG_DIR
;
371 dir_name
= dirname(so
->elf_path
);
376 /* so_dir is just dir_name with a trailing slash */
377 so_dir
= malloc(strlen(dir_name
) + 2);
382 strcpy(so_dir
, dir_name
);
385 max_path_len
= strlen(dbg_dir
) + strlen(so_dir
) +
386 strlen(DEBUG_SUBDIR
) + strlen(so
->dbg_link_filename
)
388 path
= malloc(max_path_len
);
393 /* First look in the SO's dir */
394 strcpy(path
, so_dir
);
395 strcat(path
, so
->dbg_link_filename
);
397 if (is_valid_debug_file(path
, so
->dbg_link_crc
)) {
401 /* If not found, look in .debug subdir */
402 strcpy(path
, so_dir
);
403 strcat(path
, DEBUG_SUBDIR
);
404 strcat(path
, so
->dbg_link_filename
);
406 if (is_valid_debug_file(path
, so
->dbg_link_crc
)) {
410 /* Lastly, look under the global debug directory */
411 strcpy(path
, dbg_dir
);
412 strcat(path
, so_dir
);
413 strcat(path
, so
->dbg_link_filename
);
415 if (is_valid_debug_file(path
, so
->dbg_link_crc
)) {
428 ret
= so_info_set_dwarf_info_from_path(so
, path
);
437 * Initialize the DWARF info for a given executable.
439 * @param so so_info instance
440 * @returns 0 on success, -1 on failure
443 int so_info_set_dwarf_info(struct so_info
*so
)
451 /* First try to set the DWARF info from the ELF file */
452 ret
= so_info_set_dwarf_info_from_path(so
, so
->elf_path
);
458 * If that fails, try to find separate debug info via build ID
461 ret
= so_info_set_dwarf_info_build_id(so
);
466 ret
= so_info_set_dwarf_info_debug_link(so
);
478 * Initialize the ELF file for a given executable.
480 * @param so so_info instance
481 * @returns 0 on success, -1 on failure
484 int so_info_set_elf_file(struct so_info
*so
)
487 Elf
*elf_file
= NULL
;
493 elf_fd
= open(so
->elf_path
, O_RDONLY
);
495 printf_verbose("Failed to open %s\n", so
->elf_path
);
499 elf_file
= elf_begin(elf_fd
, ELF_C_READ
, NULL
);
501 printf_debug("elf_begin failed: %s\n", elf_errmsg(-1));
505 if (elf_kind(elf_file
) != ELF_K_ELF
) {
506 printf_verbose("Error: %s is not an ELF object\n",
512 so
->elf_file
= elf_file
;
523 void source_location_destroy(struct source_location
*src_loc
)
529 free(src_loc
->filename
);
533 * Append a string representation of an address offset to an existing
536 * On success, the out parameter `result` will contain the base string
537 * followed by the offset string of the form "+0x1234". On failure,
538 * `result` remains unchanged.
540 * @param base_str The string to which to append an offset string
541 * @param low_addr The lower virtual memory address, the base from
542 * which the offset is computed
543 * @param high_addr The higher virtual memory address
544 * @param result Out parameter, the base string followed by the
546 * @returns 0 on success, -1 on failure
549 int so_info_append_offset_str(const char *base_str
, uint64_t low_addr
,
550 uint64_t high_addr
, char **result
)
554 char *_result
= NULL
;
555 char offset_str
[ADDR_STR_LEN
];
557 if (!base_str
|| !result
) {
561 offset
= high_addr
- low_addr
;
563 _result
= malloc(strlen(base_str
) + ADDR_STR_LEN
);
568 ret
= snprintf(offset_str
, ADDR_STR_LEN
, "+%#0" PRIx64
, offset
);
572 strcpy(_result
, base_str
);
573 strcat(_result
, offset_str
);
584 * Try to find the symbol closest to an address within a given ELF
587 * Only function symbols are taken into account. The symbol's address
588 * must precede `addr`. A symbol with a closer address might exist
589 * after `addr` but is irrelevant because it cannot encompass `addr`.
591 * On success, if found, the out parameters `sym` and `shdr` are
592 * set. On failure or if none are found, they remain unchanged.
594 * @param scn ELF section in which to look for the address
595 * @param addr Virtual memory address for which to find the
596 * nearest function symbol
597 * @param sym Out parameter, the nearest function symbol
598 * @param shdr Out parameter, the section header for scn
599 * @returns 0 on success, -1 on failure
602 int so_info_get_nearest_symbol_from_section(Elf_Scn
*scn
, uint64_t addr
,
603 GElf_Sym
**sym
, GElf_Shdr
**shdr
)
607 Elf_Data
*data
= NULL
;
608 GElf_Shdr
*_shdr
= NULL
;
609 GElf_Sym
*nearest_sym
= NULL
;
611 if (!scn
|| !sym
|| !shdr
) {
615 _shdr
= g_new0(GElf_Shdr
, 1);
620 _shdr
= gelf_getshdr(scn
, _shdr
);
625 if (_shdr
->sh_type
!= SHT_SYMTAB
) {
627 * We are only interested in symbol table (symtab)
628 * sections, skip this one.
633 data
= elf_getdata(scn
, NULL
);
638 symbol_count
= _shdr
->sh_size
/ _shdr
->sh_entsize
;
640 for (i
= 0; i
< symbol_count
; ++i
) {
641 GElf_Sym
*cur_sym
= NULL
;
643 cur_sym
= g_new0(GElf_Sym
, 1);
647 cur_sym
= gelf_getsym(data
, i
, cur_sym
);
651 if (GELF_ST_TYPE(cur_sym
->st_info
) != STT_FUNC
) {
652 /* We're only interested in the functions. */
657 if (cur_sym
->st_value
<= addr
&&
659 cur_sym
->st_value
> nearest_sym
->st_value
)) {
661 nearest_sym
= cur_sym
;
684 * Get the name of the function containing a given address within an
685 * executable using ELF symbols.
687 * The function name is in fact the name of the nearest ELF symbol,
688 * followed by the offset in bytes between the address and the symbol
689 * (in hex), separated by a '+' character.
691 * If found, the out parameter `func_name` is set on success. On failure,
692 * it remains unchanged.
694 * @param so so_info instance for the executable containing
696 * @param addr Virtual memory address for which to find the
698 * @param func_name Out parameter, the function name
699 * @returns 0 on success, -1 on failure
702 int so_info_lookup_elf_function_name(struct so_info
*so
, uint64_t addr
,
706 * TODO (possible optimisation): if an ELF has no symtab
707 * section, it has been stripped. Therefore, it would be wise
708 * to store a flag indicating the stripped status after the
709 * first iteration to prevent subsequent ones.
713 GElf_Sym
*sym
= NULL
;
714 GElf_Shdr
*shdr
= NULL
;
715 char *sym_name
= NULL
;
717 /* Set ELF file if it hasn't been accessed yet. */
719 ret
= so_info_set_elf_file(so
);
721 /* Failed to set ELF file. */
726 scn
= elf_nextscn(so
->elf_file
, scn
);
731 while (scn
&& !sym
) {
732 ret
= so_info_get_nearest_symbol_from_section(
733 scn
, addr
, &sym
, &shdr
);
738 scn
= elf_nextscn(so
->elf_file
, scn
);
742 sym_name
= elf_strptr(so
->elf_file
, shdr
->sh_link
,
748 ret
= so_info_append_offset_str(sym_name
, sym
->st_value
, addr
,
766 * Get the name of the function containing a given address within a
767 * given compile unit (CU).
769 * If found, the out parameter `func_name` is set on success. On
770 * failure, it remains unchanged.
772 * @param cu bt_dwarf_cu instance which may contain the address
773 * @param addr Virtual memory address for which to find the
775 * @param func_name Out parameter, the function name
776 * @returns 0 on success, -1 on failure
779 int so_info_lookup_cu_function_name(struct bt_dwarf_cu
*cu
, uint64_t addr
,
782 int ret
= 0, found
= 0;
783 struct bt_dwarf_die
*die
= NULL
;
785 if (!cu
|| !func_name
) {
789 die
= bt_dwarf_die_create(cu
);
794 while (bt_dwarf_die_next(die
) == 0) {
797 ret
= bt_dwarf_die_get_tag(die
, &tag
);
802 if (tag
== DW_TAG_subprogram
) {
803 ret
= bt_dwarf_die_contains_addr(die
, addr
, &found
);
815 uint64_t low_addr
= 0;
816 char *die_name
= NULL
;
818 ret
= bt_dwarf_die_get_name(die
, &die_name
);
823 ret
= dwarf_lowpc(die
->dwarf_die
, &low_addr
);
828 ret
= so_info_append_offset_str(die_name
, low_addr
, addr
,
835 bt_dwarf_die_destroy(die
);
839 bt_dwarf_die_destroy(die
);
844 * Get the name of the function containing a given address within an
845 * executable using DWARF debug info.
847 * If found, the out parameter `func_name` is set on success. On
848 * failure, it remains unchanged.
850 * @param so so_info instance for the executable containing
852 * @param addr Virtual memory address for which to find the
854 * @param func_name Out parameter, the function name
855 * @returns 0 on success, -1 on failure
858 int so_info_lookup_dwarf_function_name(struct so_info
*so
, uint64_t addr
,
862 char *_func_name
= NULL
;
863 struct bt_dwarf_cu
*cu
= NULL
;
865 if (!so
|| !func_name
) {
869 cu
= bt_dwarf_cu_create(so
->dwarf_info
);
874 while (bt_dwarf_cu_next(cu
) == 0) {
875 ret
= so_info_lookup_cu_function_name(cu
, addr
, &_func_name
);
886 *func_name
= _func_name
;
889 bt_dwarf_cu_destroy(cu
);
893 bt_dwarf_cu_destroy(cu
);
898 int so_info_lookup_function_name(struct so_info
*so
, uint64_t addr
,
902 char *_func_name
= NULL
;
904 if (!so
|| !func_name
) {
908 /* Set DWARF info if it hasn't been accessed yet. */
909 if (!so
->dwarf_info
&& !so
->is_elf_only
) {
910 ret
= so_info_set_dwarf_info(so
);
912 /* Failed to set DWARF info, fallback to ELF. */
913 so
->is_elf_only
= true;
917 if (!so_info_has_address(so
, addr
)) {
922 * Addresses in ELF and DWARF are relative to base address for
923 * PIC, so make the address argument relative too if needed.
926 addr
-= so
->low_addr
;
929 if (so
->is_elf_only
) {
930 ret
= so_info_lookup_elf_function_name(so
, addr
, &_func_name
);
932 ret
= so_info_lookup_dwarf_function_name(so
, addr
, &_func_name
);
935 if (ret
|| !_func_name
) {
939 *func_name
= _func_name
;
947 int so_info_get_bin_loc(struct so_info
*so
, uint64_t addr
, char **bin_loc
)
950 char *_bin_loc
= NULL
;
952 if (!so
|| !bin_loc
) {
957 addr
-= so
->low_addr
;
958 ret
= asprintf(&_bin_loc
, "+%#0" PRIx64
, addr
);
960 ret
= asprintf(&_bin_loc
, "@%#0" PRIx64
, addr
);
963 if (ret
== -1 || !_bin_loc
) {
975 * Predicate used to determine whether the children of a given DIE
976 * contain a specific address.
978 * More specifically, the parameter `die` is expected to be a
979 * subprogram (function) DIE, and this predicate tells whether any
980 * subroutines are inlined within this function and would contain
983 * Do note that this function advances the position of `die`. If the
984 * address is found within one of its children, `die` will be pointing
985 * to that child upon returning from the function, allowing to extract
986 * the information deemed necessary.
988 * @param die The parent DIE in whose children the address will be
990 * @param addr The address for which to look for in the DIEs
991 * @returns Returns 1 if the address was found, 0 if not
994 int so_info_child_die_has_address(struct bt_dwarf_die
*die
, uint64_t addr
)
996 int ret
= 0, contains
= 0;
1002 ret
= bt_dwarf_die_child(die
);
1010 ret
= bt_dwarf_die_get_tag(die
, &tag
);
1015 if (tag
== DW_TAG_inlined_subroutine
) {
1016 ret
= bt_dwarf_die_contains_addr(die
, addr
, &contains
);
1026 } while (bt_dwarf_die_next(die
) == 0);
1037 * Lookup the source location for a given address within a CU, making
1038 * the assumption that it is contained within an inline routine in a
1041 * @param cu bt_dwarf_cu instance in which to look for the address
1042 * @param addr The address for which to look for
1043 * @param src_loc Out parameter, the source location (filename and
1044 * line number) for the address
1045 * @returns 0 on success, -1 on failure
1048 int so_info_lookup_cu_src_loc_inl(struct bt_dwarf_cu
*cu
, uint64_t addr
,
1049 struct source_location
**src_loc
)
1051 int ret
= 0, found
= 0;
1052 struct bt_dwarf_die
*die
= NULL
;
1053 struct source_location
*_src_loc
= NULL
;
1055 if (!cu
|| !src_loc
) {
1059 die
= bt_dwarf_die_create(cu
);
1064 while (bt_dwarf_die_next(die
) == 0) {
1067 ret
= bt_dwarf_die_get_tag(die
, &tag
);
1072 if (tag
== DW_TAG_subprogram
) {
1075 ret
= bt_dwarf_die_contains_addr(die
, addr
, &contains
);
1082 * Try to find an inlined subroutine
1083 * child of this DIE containing addr.
1085 found
= so_info_child_die_has_address(
1094 char *filename
= NULL
;
1097 _src_loc
= g_new0(struct source_location
, 1);
1102 ret
= bt_dwarf_die_get_call_file(die
, &filename
);
1106 ret
= bt_dwarf_die_get_call_line(die
, &line_no
);
1112 _src_loc
->filename
= filename
;
1113 _src_loc
->line_no
= line_no
;
1114 *src_loc
= _src_loc
;
1117 bt_dwarf_die_destroy(die
);
1121 source_location_destroy(_src_loc
);
1122 bt_dwarf_die_destroy(die
);
1127 * Lookup the source location for a given address within a CU,
1128 * assuming that it is contained within an inlined function.
1130 * A source location can be found regardless of inlining status for
1131 * this method, but in the case of an inlined function, the returned
1132 * source location will point not to the callsite but rather to the
1133 * definition site of the inline function.
1135 * @param cu bt_dwarf_cu instance in which to look for the address
1136 * @param addr The address for which to look for
1137 * @param src_loc Out parameter, the source location (filename and
1138 * line number) for the address
1139 * @returns 0 on success, -1 on failure
1142 int so_info_lookup_cu_src_loc_no_inl(struct bt_dwarf_cu
*cu
, uint64_t addr
,
1143 struct source_location
**src_loc
)
1145 struct source_location
*_src_loc
= NULL
;
1146 struct bt_dwarf_die
*die
= NULL
;
1147 const char *filename
= NULL
;
1148 Dwarf_Line
*line
= NULL
;
1149 Dwarf_Addr line_addr
;
1152 if (!cu
|| !src_loc
) {
1156 die
= bt_dwarf_die_create(cu
);
1161 line
= dwarf_getsrc_die(die
->dwarf_die
, addr
);
1166 ret
= dwarf_lineaddr(line
, &line_addr
);
1171 filename
= dwarf_linesrc(line
, NULL
, NULL
);
1176 if (addr
== line_addr
) {
1177 _src_loc
= g_new0(struct source_location
, 1);
1182 ret
= dwarf_lineno(line
, &line_no
);
1187 _src_loc
->line_no
= line_no
;
1188 _src_loc
->filename
= strdup(filename
);
1191 bt_dwarf_die_destroy(die
);
1194 *src_loc
= _src_loc
;
1200 source_location_destroy(_src_loc
);
1201 bt_dwarf_die_destroy(die
);
1206 * Get the source location (file name and line number) for a given
1207 * address within a compile unit (CU).
1209 * On success, the out parameter `src_loc` is set if found. On
1210 * failure, it remains unchanged.
1212 * @param so bt_dwarf_cu instance for the compile unit which
1213 * may contain the address
1214 * @param addr Virtual memory address for which to find the
1216 * @param src_loc Out parameter, the source location
1217 * @returns 0 on success, -1 on failure
1220 int so_info_lookup_cu_src_loc(struct bt_dwarf_cu
*cu
, uint64_t addr
,
1221 struct source_location
**src_loc
)
1224 struct source_location
*_src_loc
= NULL
;
1226 if (!cu
|| !src_loc
) {
1230 ret
= so_info_lookup_cu_src_loc_inl(cu
, addr
, &_src_loc
);
1239 ret
= so_info_lookup_cu_src_loc_no_inl(cu
, addr
, &_src_loc
);
1250 *src_loc
= _src_loc
;
1256 source_location_destroy(_src_loc
);
1261 int so_info_lookup_source_location(struct so_info
*so
, uint64_t addr
,
1262 struct source_location
**src_loc
)
1264 struct bt_dwarf_cu
*cu
= NULL
;
1265 struct source_location
*_src_loc
= NULL
;
1267 if (!so
|| !src_loc
) {
1271 /* Set DWARF info if it hasn't been accessed yet. */
1272 if (!so
->dwarf_info
&& !so
->is_elf_only
) {
1273 if (so_info_set_dwarf_info(so
)) {
1274 /* Failed to set DWARF info. */
1275 so
->is_elf_only
= true;
1279 if (so
->is_elf_only
) {
1280 /* We cannot lookup source location without DWARF info. */
1284 if (!so_info_has_address(so
, addr
)) {
1289 * Addresses in ELF and DWARF are relative to base address for
1290 * PIC, so make the address argument relative too if needed.
1293 addr
-= so
->low_addr
;
1296 cu
= bt_dwarf_cu_create(so
->dwarf_info
);
1301 while (bt_dwarf_cu_next(cu
) == 0) {
1304 ret
= so_info_lookup_cu_src_loc(cu
, addr
, &_src_loc
);
1314 bt_dwarf_cu_destroy(cu
);
1316 *src_loc
= _src_loc
;
1322 source_location_destroy(_src_loc
);
1323 bt_dwarf_cu_destroy(cu
);