X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Felf.h;h=9a6b298482528340bee691654e5a61cb5ca79b3e;hb=baa8acf3af23bc5d9373144bef8147744b5ae01f;hp=ea0351de2933d682712c1a0e90cbeac6552c4788;hpb=9d315d6d74aac2986b10d708c864d152a0febec7;p=lttng-ust.git

diff --git a/src/common/elf.h b/src/common/elf.h
index ea0351de..9a6b2984 100644
--- a/src/common/elf.h
+++ b/src/common/elf.h
@@ -10,6 +10,9 @@
 #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;
@@ -67,13 +70,163 @@ struct lttng_ust_elf {
 	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 LTTNG_UST_BYTE_ORDER == LTTNG_UST_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 = lttng_ust_bswap_64(x);	\
+			break;			\
+		case 4:				\
+			x = lttng_ust_bswap_32(x);	\
+			break;			\
+		case 2:				\
+			x = lttng_ust_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 */