clock.h \
creds.h \
dynamic-type.h \
- elf.h \
err-ptr.h \
events.h \
hash.h \
# Common library
libcommon_la_SOURCES = \
+ elf.c \
+ elf.h \
getenv.c \
getenv.h \
logging.c \
smp.h \
strutils.c \
strutils.h \
+ utils.c \
+ utils.h \
patient.c
libcommon_la_LIBADD = \
--- /dev/null
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Copyright (C) 2015 Antoine Busque <abusque@efficios.com>
+ */
+
+#define _LGPL_SOURCE
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <lttng/ust-utils.h>
+
+#include "common/elf.h"
+#include "common/logging.h"
+#include "common/macros.h"
+#include "common/ust-fd.h"
+#include "common/utils.h"
+
+#define BUF_LEN 4096
+
+#ifndef NT_GNU_BUILD_ID
+# define NT_GNU_BUILD_ID 3
+#endif
+
+/*
+ * Retrieve the nth (where n is the `index` argument) phdr (program
+ * header) from the given elf instance.
+ *
+ * A pointer to the phdr is returned on success, NULL on failure.
+ */
+static
+struct lttng_ust_elf_phdr *lttng_ust_elf_get_phdr(struct lttng_ust_elf *elf,
+ uint16_t index)
+{
+ struct lttng_ust_elf_phdr *phdr = NULL;
+ off_t offset;
+
+ if (!elf) {
+ goto error;
+ }
+
+ if (index >= elf->ehdr->e_phnum) {
+ goto error;
+ }
+
+ phdr = zmalloc(sizeof(struct lttng_ust_elf_phdr));
+ if (!phdr) {
+ goto error;
+ }
+
+ offset = (off_t) elf->ehdr->e_phoff
+ + (off_t) index * elf->ehdr->e_phentsize;
+ if (lseek(elf->fd, offset, SEEK_SET) < 0) {
+ goto error;
+ }
+
+ if (is_elf_32_bit(elf)) {
+ Elf32_Phdr elf_phdr;
+
+ if (lttng_ust_read(elf->fd, &elf_phdr, sizeof(elf_phdr))
+ < sizeof(elf_phdr)) {
+ goto error;
+ }
+ if (!is_elf_native_endian(elf)) {
+ bswap_phdr(elf_phdr);
+ }
+ copy_phdr(elf_phdr, *phdr);
+ } else {
+ Elf64_Phdr elf_phdr;
+
+ if (lttng_ust_read(elf->fd, &elf_phdr, sizeof(elf_phdr))
+ < sizeof(elf_phdr)) {
+ goto error;
+ }
+ if (!is_elf_native_endian(elf)) {
+ bswap_phdr(elf_phdr);
+ }
+ copy_phdr(elf_phdr, *phdr);
+ }
+
+ return phdr;
+
+error:
+ free(phdr);
+ return NULL;
+}
+
+/*
+ * Retrieve the nth (where n is the `index` argument) shdr (section
+ * header) from the given elf instance.
+ *
+ * A pointer to the shdr is returned on success, NULL on failure.
+ */
+static
+struct lttng_ust_elf_shdr *lttng_ust_elf_get_shdr(struct lttng_ust_elf *elf,
+ uint16_t index)
+{
+ struct lttng_ust_elf_shdr *shdr = NULL;
+ off_t offset;
+
+ if (!elf) {
+ goto error;
+ }
+
+ if (index >= elf->ehdr->e_shnum) {
+ goto error;
+ }
+
+ shdr = zmalloc(sizeof(struct lttng_ust_elf_shdr));
+ if (!shdr) {
+ goto error;
+ }
+
+ offset = (off_t) elf->ehdr->e_shoff
+ + (off_t) index * elf->ehdr->e_shentsize;
+ if (lseek(elf->fd, offset, SEEK_SET) < 0) {
+ goto error;
+ }
+
+ if (is_elf_32_bit(elf)) {
+ Elf32_Shdr elf_shdr;
+
+ if (lttng_ust_read(elf->fd, &elf_shdr, sizeof(elf_shdr))
+ < sizeof(elf_shdr)) {
+ goto error;
+ }
+ if (!is_elf_native_endian(elf)) {
+ bswap_shdr(elf_shdr);
+ }
+ copy_shdr(elf_shdr, *shdr);
+ } else {
+ Elf64_Shdr elf_shdr;
+
+ if (lttng_ust_read(elf->fd, &elf_shdr, sizeof(elf_shdr))
+ < sizeof(elf_shdr)) {
+ goto error;
+ }
+ if (!is_elf_native_endian(elf)) {
+ bswap_shdr(elf_shdr);
+ }
+ copy_shdr(elf_shdr, *shdr);
+ }
+
+ return shdr;
+
+error:
+ free(shdr);
+ return NULL;
+}
+
+/*
+ * Lookup a section's name from a given offset (usually from an shdr's
+ * sh_name value) in bytes relative to the beginning of the section
+ * names string table.
+ *
+ * If no name is found, NULL is returned.
+ */
+static
+char *lttng_ust_elf_get_section_name(struct lttng_ust_elf *elf, off_t offset)
+{
+ char *name = NULL;
+ size_t len = 0, to_read; /* len does not include \0 */
+
+ if (!elf) {
+ goto error;
+ }
+
+ if (offset >= elf->section_names_size) {
+ goto error;
+ }
+
+ if (lseek(elf->fd, elf->section_names_offset + offset, SEEK_SET) < 0) {
+ goto error;
+ }
+
+ to_read = elf->section_names_size - offset;
+
+ /* Find first \0 after or at current location, remember len. */
+ for (;;) {
+ char buf[BUF_LEN];
+ ssize_t read_len;
+ size_t i;
+
+ if (!to_read) {
+ goto error;
+ }
+ read_len = lttng_ust_read(elf->fd, buf,
+ min_t(size_t, BUF_LEN, to_read));
+ if (read_len <= 0) {
+ goto error;
+ }
+ for (i = 0; i < read_len; i++) {
+ if (buf[i] == '\0') {
+ len += i;
+ goto end;
+ }
+ }
+ len += read_len;
+ to_read -= read_len;
+ }
+end:
+ name = zmalloc(sizeof(char) * (len + 1)); /* + 1 for \0 */
+ if (!name) {
+ goto error;
+ }
+ if (lseek(elf->fd, elf->section_names_offset + offset,
+ SEEK_SET) < 0) {
+ goto error;
+ }
+ if (lttng_ust_read(elf->fd, name, len + 1) < len + 1) {
+ goto error;
+ }
+
+ return name;
+
+error:
+ free(name);
+ return NULL;
+}
+
+/*
+ * Create an instance of lttng_ust_elf for the ELF file located at
+ * `path`.
+ *
+ * Return a pointer to the instance on success, NULL on failure.
+ */
+struct lttng_ust_elf *lttng_ust_elf_create(const char *path)
+{
+ uint8_t e_ident[EI_NIDENT];
+ struct lttng_ust_elf_shdr *section_names_shdr;
+ struct lttng_ust_elf *elf = NULL;
+ int ret, fd;
+
+ elf = zmalloc(sizeof(struct lttng_ust_elf));
+ if (!elf) {
+ goto error;
+ }
+
+ /* Initialize fd field to -1. 0 is a valid fd number */
+ elf->fd = -1;
+
+ elf->path = strdup(path);
+ if (!elf->path) {
+ goto error;
+ }
+
+ lttng_ust_lock_fd_tracker();
+ fd = open(elf->path, O_RDONLY | O_CLOEXEC);
+ if (fd < 0) {
+ lttng_ust_unlock_fd_tracker();
+ goto error;
+ }
+
+ ret = lttng_ust_add_fd_to_tracker(fd);
+ if (ret < 0) {
+ ret = close(fd);
+ if (ret) {
+ PERROR("close on elf->fd");
+ }
+ ret = -1;
+ lttng_ust_unlock_fd_tracker();
+ goto error;
+ }
+ elf->fd = ret;
+ lttng_ust_unlock_fd_tracker();
+
+ if (lttng_ust_read(elf->fd, e_ident, EI_NIDENT) < EI_NIDENT) {
+ goto error;
+ }
+ elf->bitness = e_ident[EI_CLASS];
+ elf->endianness = e_ident[EI_DATA];
+
+ if (lseek(elf->fd, 0, SEEK_SET) < 0) {
+ goto error;
+ }
+
+ elf->ehdr = zmalloc(sizeof(struct lttng_ust_elf_ehdr));
+ if (!elf->ehdr) {
+ goto error;
+ }
+
+ if (is_elf_32_bit(elf)) {
+ Elf32_Ehdr elf_ehdr;
+
+ if (lttng_ust_read(elf->fd, &elf_ehdr, sizeof(elf_ehdr))
+ < sizeof(elf_ehdr)) {
+ goto error;
+ }
+ if (!is_elf_native_endian(elf)) {
+ bswap_ehdr(elf_ehdr);
+ }
+ copy_ehdr(elf_ehdr, *(elf->ehdr));
+ } else {
+ Elf64_Ehdr elf_ehdr;
+
+ if (lttng_ust_read(elf->fd, &elf_ehdr, sizeof(elf_ehdr))
+ < sizeof(elf_ehdr)) {
+ goto error;
+ }
+ if (!is_elf_native_endian(elf)) {
+ bswap_ehdr(elf_ehdr);
+ }
+ copy_ehdr(elf_ehdr, *(elf->ehdr));
+ }
+
+ section_names_shdr = lttng_ust_elf_get_shdr(elf, elf->ehdr->e_shstrndx);
+ if (!section_names_shdr) {
+ goto error;
+ }
+
+ elf->section_names_offset = section_names_shdr->sh_offset;
+ elf->section_names_size = section_names_shdr->sh_size;
+
+ free(section_names_shdr);
+ return elf;
+
+error:
+ lttng_ust_elf_destroy(elf);
+ return NULL;
+}
+
+/*
+ * Test whether the ELF file is position independent code (PIC)
+ */
+uint8_t lttng_ust_elf_is_pic(struct lttng_ust_elf *elf)
+{
+ /*
+ * PIC has and e_type value of ET_DYN, see ELF specification
+ * version 1.1 p. 1-3.
+ */
+ return elf->ehdr->e_type == ET_DYN;
+}
+
+/*
+ * Destroy the given lttng_ust_elf instance.
+ */
+void lttng_ust_elf_destroy(struct lttng_ust_elf *elf)
+{
+ int ret;
+
+ if (!elf) {
+ return;
+ }
+
+ if (elf->fd >= 0) {
+ lttng_ust_lock_fd_tracker();
+ ret = close(elf->fd);
+ if (!ret) {
+ lttng_ust_delete_fd_from_tracker(elf->fd);
+ } else {
+ PERROR("close");
+ abort();
+ }
+ lttng_ust_unlock_fd_tracker();
+ }
+
+ free(elf->ehdr);
+ free(elf->path);
+ free(elf);
+}
+
+/*
+ * Compute the total in-memory size of the ELF file, in bytes.
+ *
+ * Returns 0 if successful, -1 if not. On success, the memory size is
+ * returned through the out parameter `memsz`.
+ */
+int lttng_ust_elf_get_memsz(struct lttng_ust_elf *elf, uint64_t *memsz)
+{
+ uint16_t i;
+ uint64_t low_addr = UINT64_MAX, high_addr = 0;
+
+ if (!elf || !memsz) {
+ goto error;
+ }
+
+ for (i = 0; i < elf->ehdr->e_phnum; ++i) {
+ struct lttng_ust_elf_phdr *phdr;
+
+ phdr = lttng_ust_elf_get_phdr(elf, i);
+ if (!phdr) {
+ goto error;
+ }
+
+ /*
+ * Only PT_LOAD segments contribute to memsz. Skip
+ * other segments.
+ */
+ if (phdr->p_type != PT_LOAD) {
+ goto next_loop;
+ }
+
+ low_addr = min_t(uint64_t, low_addr, phdr->p_vaddr);
+ high_addr = max_t(uint64_t, high_addr,
+ phdr->p_vaddr + phdr->p_memsz);
+ next_loop:
+ free(phdr);
+ }
+
+ if (high_addr < low_addr) {
+ /* No PT_LOAD segments or corrupted data. */
+ goto error;
+ }
+
+ *memsz = high_addr - low_addr;
+ return 0;
+error:
+ return -1;
+}
+
+/*
+ * Internal method used to try and get the build_id from a PT_NOTE
+ * segment ranging from `offset` to `segment_end`.
+ *
+ * If the function returns successfully, the out parameter `found`
+ * indicates whether the build id information was present in the
+ * segment or not. If `found` is not 0, the out parameters `build_id`
+ * and `length` will both have been set with the retrieved
+ * information.
+ *
+ * Returns 0 on success, -1 if an error occurred.
+ */
+static
+int lttng_ust_elf_get_build_id_from_segment(
+ struct lttng_ust_elf *elf, uint8_t **build_id, size_t *length,
+ off_t offset, off_t segment_end)
+{
+ uint8_t *_build_id = NULL; /* Silence old gcc warning. */
+ size_t _length = 0; /* Silence old gcc warning. */
+
+ while (offset < segment_end) {
+ struct lttng_ust_elf_nhdr nhdr;
+ size_t read_len;
+
+ /* Align start of note entry */
+ offset += lttng_ust_offset_align(offset, ELF_NOTE_ENTRY_ALIGN);
+ if (offset >= segment_end) {
+ break;
+ }
+ /*
+ * We seek manually because if the note isn't the
+ * build id the data following the header will not
+ * have been read.
+ */
+ if (lseek(elf->fd, offset, SEEK_SET) < 0) {
+ goto error;
+ }
+ if (lttng_ust_read(elf->fd, &nhdr, sizeof(nhdr))
+ < sizeof(nhdr)) {
+ goto error;
+ }
+
+ if (!is_elf_native_endian(elf)) {
+ nhdr.n_namesz = bswap_32(nhdr.n_namesz);
+ nhdr.n_descsz = bswap_32(nhdr.n_descsz);
+ nhdr.n_type = bswap_32(nhdr.n_type);
+ }
+
+ offset += sizeof(nhdr) + nhdr.n_namesz;
+ /* Align start of desc entry */
+ offset += lttng_ust_offset_align(offset, ELF_NOTE_DESC_ALIGN);
+
+ if (nhdr.n_type != NT_GNU_BUILD_ID) {
+ /*
+ * Ignore non build id notes but still
+ * increase the offset.
+ */
+ offset += nhdr.n_descsz;
+ continue;
+ }
+
+ _length = nhdr.n_descsz;
+ _build_id = zmalloc(sizeof(uint8_t) * _length);
+ if (!_build_id) {
+ goto error;
+ }
+
+ if (lseek(elf->fd, offset, SEEK_SET) < 0) {
+ goto error;
+ }
+ read_len = sizeof(*_build_id) * _length;
+ if (lttng_ust_read(elf->fd, _build_id, read_len) < read_len) {
+ goto error;
+ }
+
+ break;
+ }
+
+ if (_build_id) {
+ *build_id = _build_id;
+ *length = _length;
+ }
+
+ return 0;
+error:
+ free(_build_id);
+ return -1;
+}
+
+/*
+ * Retrieve a build ID (an array of bytes) from the corresponding
+ * section in the ELF file. The length of the build ID can be either
+ * 16 or 20 bytes depending on the method used to generate it, hence
+ * the length out parameter.
+ *
+ * If the function returns successfully, the out parameter `found`
+ * indicates whether the build id information was present in the ELF
+ * file or not. If `found` is not 0, the out parameters `build_id` and
+ * `length` will both have been set with the retrieved information.
+ *
+ * Returns 0 on success, -1 if an error occurred.
+ */
+int lttng_ust_elf_get_build_id(struct lttng_ust_elf *elf, uint8_t **build_id,
+ size_t *length, int *found)
+{
+ uint16_t i;
+ uint8_t *_build_id = NULL; /* Silence old gcc warning. */
+ size_t _length = 0; /* Silence old gcc warning. */
+
+ if (!elf || !build_id || !length || !found) {
+ goto error;
+ }
+
+ for (i = 0; i < elf->ehdr->e_phnum; ++i) {
+ off_t offset, segment_end;
+ struct lttng_ust_elf_phdr *phdr;
+ int ret = 0;
+
+ phdr = lttng_ust_elf_get_phdr(elf, i);
+ if (!phdr) {
+ goto error;
+ }
+
+ /* Build ID will be contained in a PT_NOTE segment. */
+ if (phdr->p_type != PT_NOTE) {
+ goto next_loop;
+ }
+
+ offset = phdr->p_offset;
+ segment_end = offset + phdr->p_filesz;
+ ret = lttng_ust_elf_get_build_id_from_segment(
+ elf, &_build_id, &_length, offset, segment_end);
+ next_loop:
+ free(phdr);
+ if (ret) {
+ goto error;
+ }
+ if (_build_id) {
+ break;
+ }
+ }
+
+ if (_build_id) {
+ *build_id = _build_id;
+ *length = _length;
+ *found = 1;
+ } else {
+ *found = 0;
+ }
+
+ return 0;
+error:
+ free(_build_id);
+ return -1;
+}
+
+/*
+ * Try to retrieve filename and CRC from given ELF section `shdr`.
+ *
+ * If the function returns successfully, the out parameter `found`
+ * indicates whether the debug link information was present in the ELF
+ * section or not. If `found` is not 0, the out parameters `filename` and
+ * `crc` will both have been set with the retrieved information.
+ *
+ * Returns 0 on success, -1 if an error occurred.
+ */
+static
+int lttng_ust_elf_get_debug_link_from_section(struct lttng_ust_elf *elf,
+ char **filename, uint32_t *crc,
+ struct lttng_ust_elf_shdr *shdr)
+{
+ char *_filename = NULL; /* Silence old gcc warning. */
+ size_t filename_len;
+ char *section_name = NULL;
+ uint32_t _crc = 0; /* Silence old gcc warning. */
+
+ if (!elf || !filename || !crc || !shdr) {
+ goto error;
+ }
+
+ /*
+ * The .gnu_debuglink section is of type SHT_PROGBITS,
+ * skip the other sections.
+ */
+ if (shdr->sh_type != SHT_PROGBITS) {
+ goto end;
+ }
+
+ section_name = lttng_ust_elf_get_section_name(elf,
+ shdr->sh_name);
+ if (!section_name) {
+ goto end;
+ }
+ if (strcmp(section_name, ".gnu_debuglink")) {
+ goto end;
+ }
+
+ /*
+ * The length of the filename is the sh_size excluding the CRC
+ * which comes after it in the section.
+ */
+ _filename = zmalloc(sizeof(char) * (shdr->sh_size - ELF_CRC_SIZE));
+ if (!_filename) {
+ goto error;
+ }
+ if (lseek(elf->fd, shdr->sh_offset, SEEK_SET) < 0) {
+ goto error;
+ }
+ filename_len = sizeof(*_filename) * (shdr->sh_size - ELF_CRC_SIZE);
+ if (lttng_ust_read(elf->fd, _filename, filename_len) < filename_len) {
+ goto error;
+ }
+ if (lttng_ust_read(elf->fd, &_crc, sizeof(_crc)) < sizeof(_crc)) {
+ goto error;
+ }
+ if (!is_elf_native_endian(elf)) {
+ _crc = bswap_32(_crc);
+ }
+
+end:
+ free(section_name);
+ if (_filename) {
+ *filename = _filename;
+ *crc = _crc;
+ }
+
+ return 0;
+
+error:
+ free(_filename);
+ free(section_name);
+ return -1;
+}
+
+/*
+ * Retrieve filename and CRC from ELF's .gnu_debuglink section, if any.
+ *
+ * If the function returns successfully, the out parameter `found`
+ * indicates whether the debug link information was present in the ELF
+ * file or not. If `found` is not 0, the out parameters `filename` and
+ * `crc` will both have been set with the retrieved information.
+ *
+ * Returns 0 on success, -1 if an error occurred.
+ */
+int lttng_ust_elf_get_debug_link(struct lttng_ust_elf *elf, char **filename,
+ uint32_t *crc, int *found)
+{
+ int ret;
+ uint16_t i;
+ char *_filename = NULL; /* Silence old gcc warning. */
+ uint32_t _crc = 0; /* Silence old gcc warning. */
+
+ if (!elf || !filename || !crc || !found) {
+ goto error;
+ }
+
+ for (i = 0; i < elf->ehdr->e_shnum; ++i) {
+ struct lttng_ust_elf_shdr *shdr = NULL;
+
+ shdr = lttng_ust_elf_get_shdr(elf, i);
+ if (!shdr) {
+ goto error;
+ }
+
+ ret = lttng_ust_elf_get_debug_link_from_section(
+ elf, &_filename, &_crc, shdr);
+ free(shdr);
+
+ if (ret) {
+ goto error;
+ }
+ if (_filename) {
+ break;
+ }
+ }
+
+ if (_filename) {
+ *filename = _filename;
+ *crc = _crc;
+ *found = 1;
+ } else {
+ *found = 0;
+ }
+
+ return 0;
+
+error:
+ free(_filename);
+ return -1;
+}
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
+#include <elf.h>
+
+#include <lttng/ust-endian.h>
struct lttng_ust_elf_ehdr {
uint16_t e_type;
uint8_t endianness;
};
-struct lttng_ust_elf *lttng_ust_elf_create(const char *path);
-void lttng_ust_elf_destroy(struct lttng_ust_elf *elf);
-uint8_t lttng_ust_elf_is_pic(struct lttng_ust_elf *elf);
-int lttng_ust_elf_get_memsz(struct lttng_ust_elf *elf, uint64_t *memsz);
+/*
+ * Determine native endianness in order to convert when reading an ELF
+ * file if there is a mismatch.
+ */
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define NATIVE_ELF_ENDIANNESS ELFDATA2LSB
+#else
+#define NATIVE_ELF_ENDIANNESS ELFDATA2MSB
+#endif
+
+/*
+ * The size in bytes of the debug link CRC as contained in an ELF
+ * section.
+ */
+#define ELF_CRC_SIZE 4
+/*
+ * ELF notes are aligned on 4 bytes. ref: ELF specification version
+ * 1.1 p. 2-5.
+ */
+#define ELF_NOTE_ENTRY_ALIGN 4
+/*
+ * Within an ELF note, the `desc` field is also aligned on 4
+ * bytes. ref: ELF specification version 1.1 p. 2-5.
+ */
+#define ELF_NOTE_DESC_ALIGN 4
+
+#define bswap(x) \
+ do { \
+ switch (sizeof(x)) { \
+ case 8: \
+ x = bswap_64(x); \
+ break; \
+ case 4: \
+ x = bswap_32(x); \
+ break; \
+ case 2: \
+ x = bswap_16(x); \
+ break; \
+ case 1: \
+ break; \
+ default: \
+ abort(); \
+ } \
+ } while (0)
+
+#define bswap_phdr(phdr) \
+ do { \
+ bswap((phdr).p_type); \
+ bswap((phdr).p_offset); \
+ bswap((phdr).p_filesz); \
+ bswap((phdr).p_memsz); \
+ bswap((phdr).p_align); \
+ bswap((phdr).p_vaddr); \
+ } while (0)
+
+#define bswap_shdr(shdr) \
+ do { \
+ bswap((shdr).sh_name); \
+ bswap((shdr).sh_type); \
+ bswap((shdr).sh_flags); \
+ bswap((shdr).sh_addr); \
+ bswap((shdr).sh_offset); \
+ bswap((shdr).sh_size); \
+ bswap((shdr).sh_link); \
+ bswap((shdr).sh_info); \
+ bswap((shdr).sh_addralign); \
+ bswap((shdr).sh_entsize); \
+ } while (0)
+
+#define bswap_ehdr(ehdr) \
+ do { \
+ bswap((ehdr).e_type); \
+ bswap((ehdr).e_machine); \
+ bswap((ehdr).e_version); \
+ bswap((ehdr).e_entry); \
+ bswap((ehdr).e_phoff); \
+ bswap((ehdr).e_shoff); \
+ bswap((ehdr).e_flags); \
+ bswap((ehdr).e_ehsize); \
+ bswap((ehdr).e_phentsize); \
+ bswap((ehdr).e_phnum); \
+ bswap((ehdr).e_shentsize); \
+ bswap((ehdr).e_shnum); \
+ bswap((ehdr).e_shstrndx); \
+ } while (0)
+
+#define copy_phdr(src_phdr, dst_phdr) \
+ do { \
+ (dst_phdr).p_type = (src_phdr).p_type; \
+ (dst_phdr).p_offset = (src_phdr).p_offset; \
+ (dst_phdr).p_filesz = (src_phdr).p_filesz; \
+ (dst_phdr).p_memsz = (src_phdr).p_memsz; \
+ (dst_phdr).p_align = (src_phdr).p_align; \
+ (dst_phdr).p_vaddr = (src_phdr).p_vaddr; \
+ } while (0)
+
+#define copy_shdr(src_shdr, dst_shdr) \
+ do { \
+ (dst_shdr).sh_name = (src_shdr).sh_name; \
+ (dst_shdr).sh_type = (src_shdr).sh_type; \
+ (dst_shdr).sh_flags = (src_shdr).sh_flags; \
+ (dst_shdr).sh_addr = (src_shdr).sh_addr; \
+ (dst_shdr).sh_offset = (src_shdr).sh_offset; \
+ (dst_shdr).sh_size = (src_shdr).sh_size; \
+ (dst_shdr).sh_link = (src_shdr).sh_link; \
+ (dst_shdr).sh_info = (src_shdr).sh_info; \
+ (dst_shdr).sh_addralign = (src_shdr).sh_addralign; \
+ (dst_shdr).sh_entsize = (src_shdr).sh_entsize; \
+ } while (0)
+
+#define copy_ehdr(src_ehdr, dst_ehdr) \
+ do { \
+ (dst_ehdr).e_type = (src_ehdr).e_type; \
+ (dst_ehdr).e_machine = (src_ehdr).e_machine; \
+ (dst_ehdr).e_version = (src_ehdr).e_version; \
+ (dst_ehdr).e_entry = (src_ehdr).e_entry; \
+ (dst_ehdr).e_phoff = (src_ehdr).e_phoff; \
+ (dst_ehdr).e_shoff = (src_ehdr).e_shoff; \
+ (dst_ehdr).e_flags = (src_ehdr).e_flags; \
+ (dst_ehdr).e_ehsize = (src_ehdr).e_ehsize; \
+ (dst_ehdr).e_phentsize = (src_ehdr).e_phentsize; \
+ (dst_ehdr).e_phnum = (src_ehdr).e_phnum; \
+ (dst_ehdr).e_shentsize = (src_ehdr).e_shentsize; \
+ (dst_ehdr).e_shnum = (src_ehdr).e_shnum; \
+ (dst_ehdr).e_shstrndx = (src_ehdr).e_shstrndx; \
+ } while (0)
+
+static inline
+int is_elf_32_bit(struct lttng_ust_elf *elf)
+{
+ return elf->bitness == ELFCLASS32;
+}
+
+static inline
+int is_elf_native_endian(struct lttng_ust_elf *elf)
+{
+ return elf->endianness == NATIVE_ELF_ENDIANNESS;
+}
+
+struct lttng_ust_elf *lttng_ust_elf_create(const char *path)
+ __attribute__((visibility("hidden")));
+
+void lttng_ust_elf_destroy(struct lttng_ust_elf *elf)
+ __attribute__((visibility("hidden")));
+
+uint8_t lttng_ust_elf_is_pic(struct lttng_ust_elf *elf)
+ __attribute__((visibility("hidden")));
+
+int lttng_ust_elf_get_memsz(struct lttng_ust_elf *elf, uint64_t *memsz)
+ __attribute__((visibility("hidden")));
+
int lttng_ust_elf_get_build_id(struct lttng_ust_elf *elf, uint8_t **build_id,
- size_t *length, int *found);
+ size_t *length, int *found)
+ __attribute__((visibility("hidden")));
+
int lttng_ust_elf_get_debug_link(struct lttng_ust_elf *elf, char **filename,
- uint32_t *crc, int *found);
+ uint32_t *crc, int *found)
+ __attribute__((visibility("hidden")));
#endif /* _UST_COMMON_ELF_H */
--- /dev/null
+/*
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "common/utils.h"
+
+ssize_t lttng_ust_read(int fd, void *buf, size_t len)
+{
+ ssize_t ret;
+ size_t copied = 0, to_copy = len;
+
+ do {
+ ret = read(fd, buf + copied, to_copy);
+ if (ret > 0) {
+ copied += ret;
+ to_copy -= ret;
+ }
+ } while ((ret > 0 && to_copy > 0)
+ || (ret < 0 && errno == EINTR));
+ if (ret > 0) {
+ ret = copied;
+ }
+ return ret;
+}
--- /dev/null
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Copyright (C) 2021 Michael Jeanson <mjeanson@efficios.com>
+ */
+
+#ifndef _UST_COMMON_UTILS_H
+#define _UST_COMMON_UTILS_H
+
+ssize_t lttng_ust_read(int fd, void *buf, size_t len)
+ __attribute__((visibility("hidden")));
+
+#endif
lttng-context-vsgid.c \
lttng-context.c \
lttng-events.c \
- lttng-ust-elf.c \
- lttng-ust-elf.h \
lttng-ust-statedump.c \
lttng-ust-statedump.h \
lttng-ust-statedump-provider.h \
void lttng_ust_sockinfo_session_enabled(void *owner)
__attribute__((visibility("hidden")));
-ssize_t lttng_ust_read(int fd, void *buf, size_t len)
- __attribute__((visibility("hidden")));
-
size_t lttng_ust_dummy_get_size(void *priv, size_t offset)
__attribute__((visibility("hidden")));
static char *get_map_shm(struct sock_info *sock_info);
-ssize_t lttng_ust_read(int fd, void *buf, size_t len)
-{
- ssize_t ret;
- size_t copied = 0, to_copy = len;
-
- do {
- ret = read(fd, buf + copied, to_copy);
- if (ret > 0) {
- copied += ret;
- to_copy -= ret;
- }
- } while ((ret > 0 && to_copy > 0)
- || (ret < 0 && errno == EINTR));
- if (ret > 0) {
- ret = copied;
- }
- return ret;
-}
/*
* Returns the HOME directory path. Caller MUST NOT free(3) the returned
* pointer.
+++ /dev/null
-/*
- * SPDX-License-Identifier: LGPL-2.1-or-later
- *
- * Copyright (C) 2015 Antoine Busque <abusque@efficios.com>
- */
-
-#define _LGPL_SOURCE
-#include <fcntl.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include <lttng/ust-utils.h>
-
-#include "common/elf.h"
-#include "common/ust-fd.h"
-
-#include "lttng-tracer-core.h"
-#include "lttng-ust-elf.h"
-#include "common/macros.h"
-
-#define BUF_LEN 4096
-
-#ifndef NT_GNU_BUILD_ID
-# define NT_GNU_BUILD_ID 3
-#endif
-
-/*
- * Retrieve the nth (where n is the `index` argument) phdr (program
- * header) from the given elf instance.
- *
- * A pointer to the phdr is returned on success, NULL on failure.
- */
-static
-struct lttng_ust_elf_phdr *lttng_ust_elf_get_phdr(struct lttng_ust_elf *elf,
- uint16_t index)
-{
- struct lttng_ust_elf_phdr *phdr = NULL;
- off_t offset;
-
- if (!elf) {
- goto error;
- }
-
- if (index >= elf->ehdr->e_phnum) {
- goto error;
- }
-
- phdr = zmalloc(sizeof(struct lttng_ust_elf_phdr));
- if (!phdr) {
- goto error;
- }
-
- offset = (off_t) elf->ehdr->e_phoff
- + (off_t) index * elf->ehdr->e_phentsize;
- if (lseek(elf->fd, offset, SEEK_SET) < 0) {
- goto error;
- }
-
- if (is_elf_32_bit(elf)) {
- Elf32_Phdr elf_phdr;
-
- if (lttng_ust_read(elf->fd, &elf_phdr, sizeof(elf_phdr))
- < sizeof(elf_phdr)) {
- goto error;
- }
- if (!is_elf_native_endian(elf)) {
- bswap_phdr(elf_phdr);
- }
- copy_phdr(elf_phdr, *phdr);
- } else {
- Elf64_Phdr elf_phdr;
-
- if (lttng_ust_read(elf->fd, &elf_phdr, sizeof(elf_phdr))
- < sizeof(elf_phdr)) {
- goto error;
- }
- if (!is_elf_native_endian(elf)) {
- bswap_phdr(elf_phdr);
- }
- copy_phdr(elf_phdr, *phdr);
- }
-
- return phdr;
-
-error:
- free(phdr);
- return NULL;
-}
-
-/*
- * Retrieve the nth (where n is the `index` argument) shdr (section
- * header) from the given elf instance.
- *
- * A pointer to the shdr is returned on success, NULL on failure.
- */
-static
-struct lttng_ust_elf_shdr *lttng_ust_elf_get_shdr(struct lttng_ust_elf *elf,
- uint16_t index)
-{
- struct lttng_ust_elf_shdr *shdr = NULL;
- off_t offset;
-
- if (!elf) {
- goto error;
- }
-
- if (index >= elf->ehdr->e_shnum) {
- goto error;
- }
-
- shdr = zmalloc(sizeof(struct lttng_ust_elf_shdr));
- if (!shdr) {
- goto error;
- }
-
- offset = (off_t) elf->ehdr->e_shoff
- + (off_t) index * elf->ehdr->e_shentsize;
- if (lseek(elf->fd, offset, SEEK_SET) < 0) {
- goto error;
- }
-
- if (is_elf_32_bit(elf)) {
- Elf32_Shdr elf_shdr;
-
- if (lttng_ust_read(elf->fd, &elf_shdr, sizeof(elf_shdr))
- < sizeof(elf_shdr)) {
- goto error;
- }
- if (!is_elf_native_endian(elf)) {
- bswap_shdr(elf_shdr);
- }
- copy_shdr(elf_shdr, *shdr);
- } else {
- Elf64_Shdr elf_shdr;
-
- if (lttng_ust_read(elf->fd, &elf_shdr, sizeof(elf_shdr))
- < sizeof(elf_shdr)) {
- goto error;
- }
- if (!is_elf_native_endian(elf)) {
- bswap_shdr(elf_shdr);
- }
- copy_shdr(elf_shdr, *shdr);
- }
-
- return shdr;
-
-error:
- free(shdr);
- return NULL;
-}
-
-/*
- * Lookup a section's name from a given offset (usually from an shdr's
- * sh_name value) in bytes relative to the beginning of the section
- * names string table.
- *
- * If no name is found, NULL is returned.
- */
-static
-char *lttng_ust_elf_get_section_name(struct lttng_ust_elf *elf, off_t offset)
-{
- char *name = NULL;
- size_t len = 0, to_read; /* len does not include \0 */
-
- if (!elf) {
- goto error;
- }
-
- if (offset >= elf->section_names_size) {
- goto error;
- }
-
- if (lseek(elf->fd, elf->section_names_offset + offset, SEEK_SET) < 0) {
- goto error;
- }
-
- to_read = elf->section_names_size - offset;
-
- /* Find first \0 after or at current location, remember len. */
- for (;;) {
- char buf[BUF_LEN];
- ssize_t read_len;
- size_t i;
-
- if (!to_read) {
- goto error;
- }
- read_len = lttng_ust_read(elf->fd, buf,
- min_t(size_t, BUF_LEN, to_read));
- if (read_len <= 0) {
- goto error;
- }
- for (i = 0; i < read_len; i++) {
- if (buf[i] == '\0') {
- len += i;
- goto end;
- }
- }
- len += read_len;
- to_read -= read_len;
- }
-end:
- name = zmalloc(sizeof(char) * (len + 1)); /* + 1 for \0 */
- if (!name) {
- goto error;
- }
- if (lseek(elf->fd, elf->section_names_offset + offset,
- SEEK_SET) < 0) {
- goto error;
- }
- if (lttng_ust_read(elf->fd, name, len + 1) < len + 1) {
- goto error;
- }
-
- return name;
-
-error:
- free(name);
- return NULL;
-}
-
-/*
- * Create an instance of lttng_ust_elf for the ELF file located at
- * `path`.
- *
- * Return a pointer to the instance on success, NULL on failure.
- */
-struct lttng_ust_elf *lttng_ust_elf_create(const char *path)
-{
- uint8_t e_ident[EI_NIDENT];
- struct lttng_ust_elf_shdr *section_names_shdr;
- struct lttng_ust_elf *elf = NULL;
- int ret, fd;
-
- elf = zmalloc(sizeof(struct lttng_ust_elf));
- if (!elf) {
- goto error;
- }
-
- /* Initialize fd field to -1. 0 is a valid fd number */
- elf->fd = -1;
-
- elf->path = strdup(path);
- if (!elf->path) {
- goto error;
- }
-
- lttng_ust_lock_fd_tracker();
- fd = open(elf->path, O_RDONLY | O_CLOEXEC);
- if (fd < 0) {
- lttng_ust_unlock_fd_tracker();
- goto error;
- }
-
- ret = lttng_ust_add_fd_to_tracker(fd);
- if (ret < 0) {
- ret = close(fd);
- if (ret) {
- PERROR("close on elf->fd");
- }
- ret = -1;
- lttng_ust_unlock_fd_tracker();
- goto error;
- }
- elf->fd = ret;
- lttng_ust_unlock_fd_tracker();
-
- if (lttng_ust_read(elf->fd, e_ident, EI_NIDENT) < EI_NIDENT) {
- goto error;
- }
- elf->bitness = e_ident[EI_CLASS];
- elf->endianness = e_ident[EI_DATA];
-
- if (lseek(elf->fd, 0, SEEK_SET) < 0) {
- goto error;
- }
-
- elf->ehdr = zmalloc(sizeof(struct lttng_ust_elf_ehdr));
- if (!elf->ehdr) {
- goto error;
- }
-
- if (is_elf_32_bit(elf)) {
- Elf32_Ehdr elf_ehdr;
-
- if (lttng_ust_read(elf->fd, &elf_ehdr, sizeof(elf_ehdr))
- < sizeof(elf_ehdr)) {
- goto error;
- }
- if (!is_elf_native_endian(elf)) {
- bswap_ehdr(elf_ehdr);
- }
- copy_ehdr(elf_ehdr, *(elf->ehdr));
- } else {
- Elf64_Ehdr elf_ehdr;
-
- if (lttng_ust_read(elf->fd, &elf_ehdr, sizeof(elf_ehdr))
- < sizeof(elf_ehdr)) {
- goto error;
- }
- if (!is_elf_native_endian(elf)) {
- bswap_ehdr(elf_ehdr);
- }
- copy_ehdr(elf_ehdr, *(elf->ehdr));
- }
-
- section_names_shdr = lttng_ust_elf_get_shdr(elf, elf->ehdr->e_shstrndx);
- if (!section_names_shdr) {
- goto error;
- }
-
- elf->section_names_offset = section_names_shdr->sh_offset;
- elf->section_names_size = section_names_shdr->sh_size;
-
- free(section_names_shdr);
- return elf;
-
-error:
- lttng_ust_elf_destroy(elf);
- return NULL;
-}
-
-/*
- * Test whether the ELF file is position independent code (PIC)
- */
-uint8_t lttng_ust_elf_is_pic(struct lttng_ust_elf *elf)
-{
- /*
- * PIC has and e_type value of ET_DYN, see ELF specification
- * version 1.1 p. 1-3.
- */
- return elf->ehdr->e_type == ET_DYN;
-}
-
-/*
- * Destroy the given lttng_ust_elf instance.
- */
-void lttng_ust_elf_destroy(struct lttng_ust_elf *elf)
-{
- int ret;
-
- if (!elf) {
- return;
- }
-
- if (elf->fd >= 0) {
- lttng_ust_lock_fd_tracker();
- ret = close(elf->fd);
- if (!ret) {
- lttng_ust_delete_fd_from_tracker(elf->fd);
- } else {
- PERROR("close");
- abort();
- }
- lttng_ust_unlock_fd_tracker();
- }
-
- free(elf->ehdr);
- free(elf->path);
- free(elf);
-}
-
-/*
- * Compute the total in-memory size of the ELF file, in bytes.
- *
- * Returns 0 if successful, -1 if not. On success, the memory size is
- * returned through the out parameter `memsz`.
- */
-int lttng_ust_elf_get_memsz(struct lttng_ust_elf *elf, uint64_t *memsz)
-{
- uint16_t i;
- uint64_t low_addr = UINT64_MAX, high_addr = 0;
-
- if (!elf || !memsz) {
- goto error;
- }
-
- for (i = 0; i < elf->ehdr->e_phnum; ++i) {
- struct lttng_ust_elf_phdr *phdr;
-
- phdr = lttng_ust_elf_get_phdr(elf, i);
- if (!phdr) {
- goto error;
- }
-
- /*
- * Only PT_LOAD segments contribute to memsz. Skip
- * other segments.
- */
- if (phdr->p_type != PT_LOAD) {
- goto next_loop;
- }
-
- low_addr = min_t(uint64_t, low_addr, phdr->p_vaddr);
- high_addr = max_t(uint64_t, high_addr,
- phdr->p_vaddr + phdr->p_memsz);
- next_loop:
- free(phdr);
- }
-
- if (high_addr < low_addr) {
- /* No PT_LOAD segments or corrupted data. */
- goto error;
- }
-
- *memsz = high_addr - low_addr;
- return 0;
-error:
- return -1;
-}
-
-/*
- * Internal method used to try and get the build_id from a PT_NOTE
- * segment ranging from `offset` to `segment_end`.
- *
- * If the function returns successfully, the out parameter `found`
- * indicates whether the build id information was present in the
- * segment or not. If `found` is not 0, the out parameters `build_id`
- * and `length` will both have been set with the retrieved
- * information.
- *
- * Returns 0 on success, -1 if an error occurred.
- */
-static
-int lttng_ust_elf_get_build_id_from_segment(
- struct lttng_ust_elf *elf, uint8_t **build_id, size_t *length,
- off_t offset, off_t segment_end)
-{
- uint8_t *_build_id = NULL; /* Silence old gcc warning. */
- size_t _length = 0; /* Silence old gcc warning. */
-
- while (offset < segment_end) {
- struct lttng_ust_elf_nhdr nhdr;
- size_t read_len;
-
- /* Align start of note entry */
- offset += lttng_ust_offset_align(offset, ELF_NOTE_ENTRY_ALIGN);
- if (offset >= segment_end) {
- break;
- }
- /*
- * We seek manually because if the note isn't the
- * build id the data following the header will not
- * have been read.
- */
- if (lseek(elf->fd, offset, SEEK_SET) < 0) {
- goto error;
- }
- if (lttng_ust_read(elf->fd, &nhdr, sizeof(nhdr))
- < sizeof(nhdr)) {
- goto error;
- }
-
- if (!is_elf_native_endian(elf)) {
- nhdr.n_namesz = bswap_32(nhdr.n_namesz);
- nhdr.n_descsz = bswap_32(nhdr.n_descsz);
- nhdr.n_type = bswap_32(nhdr.n_type);
- }
-
- offset += sizeof(nhdr) + nhdr.n_namesz;
- /* Align start of desc entry */
- offset += lttng_ust_offset_align(offset, ELF_NOTE_DESC_ALIGN);
-
- if (nhdr.n_type != NT_GNU_BUILD_ID) {
- /*
- * Ignore non build id notes but still
- * increase the offset.
- */
- offset += nhdr.n_descsz;
- continue;
- }
-
- _length = nhdr.n_descsz;
- _build_id = zmalloc(sizeof(uint8_t) * _length);
- if (!_build_id) {
- goto error;
- }
-
- if (lseek(elf->fd, offset, SEEK_SET) < 0) {
- goto error;
- }
- read_len = sizeof(*_build_id) * _length;
- if (lttng_ust_read(elf->fd, _build_id, read_len) < read_len) {
- goto error;
- }
-
- break;
- }
-
- if (_build_id) {
- *build_id = _build_id;
- *length = _length;
- }
-
- return 0;
-error:
- free(_build_id);
- return -1;
-}
-
-/*
- * Retrieve a build ID (an array of bytes) from the corresponding
- * section in the ELF file. The length of the build ID can be either
- * 16 or 20 bytes depending on the method used to generate it, hence
- * the length out parameter.
- *
- * If the function returns successfully, the out parameter `found`
- * indicates whether the build id information was present in the ELF
- * file or not. If `found` is not 0, the out parameters `build_id` and
- * `length` will both have been set with the retrieved information.
- *
- * Returns 0 on success, -1 if an error occurred.
- */
-int lttng_ust_elf_get_build_id(struct lttng_ust_elf *elf, uint8_t **build_id,
- size_t *length, int *found)
-{
- uint16_t i;
- uint8_t *_build_id = NULL; /* Silence old gcc warning. */
- size_t _length = 0; /* Silence old gcc warning. */
-
- if (!elf || !build_id || !length || !found) {
- goto error;
- }
-
- for (i = 0; i < elf->ehdr->e_phnum; ++i) {
- off_t offset, segment_end;
- struct lttng_ust_elf_phdr *phdr;
- int ret = 0;
-
- phdr = lttng_ust_elf_get_phdr(elf, i);
- if (!phdr) {
- goto error;
- }
-
- /* Build ID will be contained in a PT_NOTE segment. */
- if (phdr->p_type != PT_NOTE) {
- goto next_loop;
- }
-
- offset = phdr->p_offset;
- segment_end = offset + phdr->p_filesz;
- ret = lttng_ust_elf_get_build_id_from_segment(
- elf, &_build_id, &_length, offset, segment_end);
- next_loop:
- free(phdr);
- if (ret) {
- goto error;
- }
- if (_build_id) {
- break;
- }
- }
-
- if (_build_id) {
- *build_id = _build_id;
- *length = _length;
- *found = 1;
- } else {
- *found = 0;
- }
-
- return 0;
-error:
- free(_build_id);
- return -1;
-}
-
-/*
- * Try to retrieve filename and CRC from given ELF section `shdr`.
- *
- * If the function returns successfully, the out parameter `found`
- * indicates whether the debug link information was present in the ELF
- * section or not. If `found` is not 0, the out parameters `filename` and
- * `crc` will both have been set with the retrieved information.
- *
- * Returns 0 on success, -1 if an error occurred.
- */
-static
-int lttng_ust_elf_get_debug_link_from_section(struct lttng_ust_elf *elf,
- char **filename, uint32_t *crc,
- struct lttng_ust_elf_shdr *shdr)
-{
- char *_filename = NULL; /* Silence old gcc warning. */
- size_t filename_len;
- char *section_name = NULL;
- uint32_t _crc = 0; /* Silence old gcc warning. */
-
- if (!elf || !filename || !crc || !shdr) {
- goto error;
- }
-
- /*
- * The .gnu_debuglink section is of type SHT_PROGBITS,
- * skip the other sections.
- */
- if (shdr->sh_type != SHT_PROGBITS) {
- goto end;
- }
-
- section_name = lttng_ust_elf_get_section_name(elf,
- shdr->sh_name);
- if (!section_name) {
- goto end;
- }
- if (strcmp(section_name, ".gnu_debuglink")) {
- goto end;
- }
-
- /*
- * The length of the filename is the sh_size excluding the CRC
- * which comes after it in the section.
- */
- _filename = zmalloc(sizeof(char) * (shdr->sh_size - ELF_CRC_SIZE));
- if (!_filename) {
- goto error;
- }
- if (lseek(elf->fd, shdr->sh_offset, SEEK_SET) < 0) {
- goto error;
- }
- filename_len = sizeof(*_filename) * (shdr->sh_size - ELF_CRC_SIZE);
- if (lttng_ust_read(elf->fd, _filename, filename_len) < filename_len) {
- goto error;
- }
- if (lttng_ust_read(elf->fd, &_crc, sizeof(_crc)) < sizeof(_crc)) {
- goto error;
- }
- if (!is_elf_native_endian(elf)) {
- _crc = bswap_32(_crc);
- }
-
-end:
- free(section_name);
- if (_filename) {
- *filename = _filename;
- *crc = _crc;
- }
-
- return 0;
-
-error:
- free(_filename);
- free(section_name);
- return -1;
-}
-
-/*
- * Retrieve filename and CRC from ELF's .gnu_debuglink section, if any.
- *
- * If the function returns successfully, the out parameter `found`
- * indicates whether the debug link information was present in the ELF
- * file or not. If `found` is not 0, the out parameters `filename` and
- * `crc` will both have been set with the retrieved information.
- *
- * Returns 0 on success, -1 if an error occurred.
- */
-int lttng_ust_elf_get_debug_link(struct lttng_ust_elf *elf, char **filename,
- uint32_t *crc, int *found)
-{
- int ret;
- uint16_t i;
- char *_filename = NULL; /* Silence old gcc warning. */
- uint32_t _crc = 0; /* Silence old gcc warning. */
-
- if (!elf || !filename || !crc || !found) {
- goto error;
- }
-
- for (i = 0; i < elf->ehdr->e_shnum; ++i) {
- struct lttng_ust_elf_shdr *shdr = NULL;
-
- shdr = lttng_ust_elf_get_shdr(elf, i);
- if (!shdr) {
- goto error;
- }
-
- ret = lttng_ust_elf_get_debug_link_from_section(
- elf, &_filename, &_crc, shdr);
- free(shdr);
-
- if (ret) {
- goto error;
- }
- if (_filename) {
- break;
- }
- }
-
- if (_filename) {
- *filename = _filename;
- *crc = _crc;
- *found = 1;
- } else {
- *found = 0;
- }
-
- return 0;
-
-error:
- free(_filename);
- return -1;
-}
+++ /dev/null
-/*
- * SPDX-License-Identifier: LGPL-2.1-or-later
- *
- * Copyright (C) 2015 Antoine Busque <abusque@efficios.com>
- */
-
-#ifndef _LIB_LTTNG_UST_ELF_H
-#define _LIB_LTTNG_UST_ELF_H
-
-#include <elf.h>
-#include <lttng/ust-endian.h>
-
-/*
- * Determine native endianness in order to convert when reading an ELF
- * file if there is a mismatch.
- */
-#if BYTE_ORDER == LITTLE_ENDIAN
-#define NATIVE_ELF_ENDIANNESS ELFDATA2LSB
-#else
-#define NATIVE_ELF_ENDIANNESS ELFDATA2MSB
-#endif
-
-/*
- * The size in bytes of the debug link CRC as contained in an ELF
- * section.
- */
-#define ELF_CRC_SIZE 4
-/*
- * ELF notes are aligned on 4 bytes. ref: ELF specification version
- * 1.1 p. 2-5.
- */
-#define ELF_NOTE_ENTRY_ALIGN 4
-/*
- * Within an ELF note, the `desc` field is also aligned on 4
- * bytes. ref: ELF specification version 1.1 p. 2-5.
- */
-#define ELF_NOTE_DESC_ALIGN 4
-
-#define bswap(x) \
- do { \
- switch (sizeof(x)) { \
- case 8: \
- x = bswap_64(x); \
- break; \
- case 4: \
- x = bswap_32(x); \
- break; \
- case 2: \
- x = bswap_16(x); \
- break; \
- case 1: \
- break; \
- default: \
- abort(); \
- } \
- } while (0)
-
-#define bswap_phdr(phdr) \
- do { \
- bswap((phdr).p_type); \
- bswap((phdr).p_offset); \
- bswap((phdr).p_filesz); \
- bswap((phdr).p_memsz); \
- bswap((phdr).p_align); \
- bswap((phdr).p_vaddr); \
- } while (0)
-
-#define bswap_shdr(shdr) \
- do { \
- bswap((shdr).sh_name); \
- bswap((shdr).sh_type); \
- bswap((shdr).sh_flags); \
- bswap((shdr).sh_addr); \
- bswap((shdr).sh_offset); \
- bswap((shdr).sh_size); \
- bswap((shdr).sh_link); \
- bswap((shdr).sh_info); \
- bswap((shdr).sh_addralign); \
- bswap((shdr).sh_entsize); \
- } while (0)
-
-#define bswap_ehdr(ehdr) \
- do { \
- bswap((ehdr).e_type); \
- bswap((ehdr).e_machine); \
- bswap((ehdr).e_version); \
- bswap((ehdr).e_entry); \
- bswap((ehdr).e_phoff); \
- bswap((ehdr).e_shoff); \
- bswap((ehdr).e_flags); \
- bswap((ehdr).e_ehsize); \
- bswap((ehdr).e_phentsize); \
- bswap((ehdr).e_phnum); \
- bswap((ehdr).e_shentsize); \
- bswap((ehdr).e_shnum); \
- bswap((ehdr).e_shstrndx); \
- } while (0)
-
-#define copy_phdr(src_phdr, dst_phdr) \
- do { \
- (dst_phdr).p_type = (src_phdr).p_type; \
- (dst_phdr).p_offset = (src_phdr).p_offset; \
- (dst_phdr).p_filesz = (src_phdr).p_filesz; \
- (dst_phdr).p_memsz = (src_phdr).p_memsz; \
- (dst_phdr).p_align = (src_phdr).p_align; \
- (dst_phdr).p_vaddr = (src_phdr).p_vaddr; \
- } while (0)
-
-#define copy_shdr(src_shdr, dst_shdr) \
- do { \
- (dst_shdr).sh_name = (src_shdr).sh_name; \
- (dst_shdr).sh_type = (src_shdr).sh_type; \
- (dst_shdr).sh_flags = (src_shdr).sh_flags; \
- (dst_shdr).sh_addr = (src_shdr).sh_addr; \
- (dst_shdr).sh_offset = (src_shdr).sh_offset; \
- (dst_shdr).sh_size = (src_shdr).sh_size; \
- (dst_shdr).sh_link = (src_shdr).sh_link; \
- (dst_shdr).sh_info = (src_shdr).sh_info; \
- (dst_shdr).sh_addralign = (src_shdr).sh_addralign; \
- (dst_shdr).sh_entsize = (src_shdr).sh_entsize; \
- } while (0)
-
-#define copy_ehdr(src_ehdr, dst_ehdr) \
- do { \
- (dst_ehdr).e_type = (src_ehdr).e_type; \
- (dst_ehdr).e_machine = (src_ehdr).e_machine; \
- (dst_ehdr).e_version = (src_ehdr).e_version; \
- (dst_ehdr).e_entry = (src_ehdr).e_entry; \
- (dst_ehdr).e_phoff = (src_ehdr).e_phoff; \
- (dst_ehdr).e_shoff = (src_ehdr).e_shoff; \
- (dst_ehdr).e_flags = (src_ehdr).e_flags; \
- (dst_ehdr).e_ehsize = (src_ehdr).e_ehsize; \
- (dst_ehdr).e_phentsize = (src_ehdr).e_phentsize; \
- (dst_ehdr).e_phnum = (src_ehdr).e_phnum; \
- (dst_ehdr).e_shentsize = (src_ehdr).e_shentsize; \
- (dst_ehdr).e_shnum = (src_ehdr).e_shnum; \
- (dst_ehdr).e_shstrndx = (src_ehdr).e_shstrndx; \
- } while (0)
-
-static inline
-int is_elf_32_bit(struct lttng_ust_elf *elf)
-{
- return elf->bitness == ELFCLASS32;
-}
-
-static inline
-int is_elf_native_endian(struct lttng_ust_elf *elf)
-{
- return elf->endianness == NATIVE_ELF_ENDIANNESS;
-}
-
-#endif
noinst_PROGRAMS = ust-elf
ust_elf_SOURCES = ust-elf.c
ust_elf_LDADD = \
- $(top_builddir)/src/lib/lttng-ust/liblttng-ust.la \
+ $(top_builddir)/src/common/libcommon.la \
+ $(top_builddir)/src/lib/lttng-ust-common/liblttng-ust-common.la \
$(top_builddir)/tests/utils/libtap.a
dist_check_SCRIPTS = test_ust_elf
projects / lttng-ust.git / commitdiff
