--- /dev/null
+#ifndef _LTTNG_UST_ELF_H
+#define _LTTNG_UST_ELF_H
+/*
+ * Copyright (C) 2015 Antoine Busque <abusque@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <byteswap.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); \
+ } 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; \
+ } 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)
+
+struct lttng_ust_elf_ehdr {
+ uint16_t e_type;
+ uint16_t e_machine;
+ uint32_t e_version;
+ uint64_t e_entry;
+ uint64_t e_phoff;
+ uint64_t e_shoff;
+ uint32_t e_flags;
+ uint16_t e_ehsize;
+ uint16_t e_phentsize;
+ uint16_t e_phnum;
+ uint16_t e_shentsize;
+ uint16_t e_shnum;
+ uint16_t e_shstrndx;
+};
+
+struct lttng_ust_elf_phdr {
+ uint32_t p_type;
+ uint64_t p_offset;
+ uint64_t p_filesz;
+ uint64_t p_memsz;
+ uint64_t p_align;
+};
+
+struct lttng_ust_elf_shdr {
+ uint32_t sh_name;
+ uint32_t sh_type;
+ uint64_t sh_flags;
+ uint64_t sh_addr;
+ uint64_t sh_offset;
+ uint64_t sh_size;
+ uint32_t sh_link;
+ uint32_t sh_info;
+ uint64_t sh_addralign;
+ uint64_t sh_entsize;
+};
+
+struct lttng_ust_elf_nhdr {
+ uint32_t n_namesz;
+ uint32_t n_descsz;
+ uint32_t n_type;
+};
+
+struct lttng_ust_elf {
+ /* Offset in bytes to start of section names string table. */
+ uint64_t section_names_offset;
+ /* Size in bytes of section names string table. */
+ uint64_t section_names_size;
+ char *path;
+ FILE *file;
+ struct lttng_ust_elf_ehdr *ehdr;
+ uint8_t bitness;
+ uint8_t endianness;
+};
+
+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);
+void lttng_ust_elf_destroy(struct lttng_ust_elf *elf);
+int lttng_ust_elf_get_memsz(struct lttng_ust_elf *elf, uint64_t *memsz);
+int lttng_ust_elf_get_build_id(struct lttng_ust_elf *elf, uint8_t **build_id,
+ size_t *length, int *found);
+int lttng_ust_elf_get_debug_link(struct lttng_ust_elf *elf, char **filename,
+ uint32_t *crc, int *found);
+
+#endif /* _LTTNG_UST_ELF_H */
projects / lttng-ust.git / blobdiff