From 987025624545159a3f5810b4a6092394279cdd6b Mon Sep 17 00:00:00 2001 From: Lingutla Chandrasekhar Date: Wed, 27 Sep 2017 18:06:52 +0530 Subject: [PATCH] elf: Add elf headers helpers support ELF header format is been used in multiple places, add helper functions to get section, program headers, and string table section details of the elf header. Change-Id: Ib67b6f25a3a9c32305710eae4ad66bea511d6799 Signed-off-by: Lingutla Chandrasekhar Signed-off-by: Rishabh Bhatnagar --- include/linux/elf.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/include/linux/elf.h b/include/linux/elf.h index e3649b3e970e..986c7bf7e3f3 100644 --- a/include/linux/elf.h +++ b/include/linux/elf.h @@ -45,6 +45,39 @@ extern Elf64_Dyn _DYNAMIC []; #endif +/* Generic helpers for ELF use */ +/* Return first section header */ +static inline struct elf_shdr *elf_sheader(struct elfhdr *hdr) +{ + return (struct elf_shdr *)((size_t)hdr + (size_t)hdr->e_shoff); +} + +/* Return idx section header */ +static inline struct elf_shdr *elf_section(struct elfhdr *hdr, int idx) +{ + return &elf_sheader(hdr)[idx]; +} + +/* Return first program header */ +static inline struct elf_phdr *elf_pheader(struct elfhdr *hdr) +{ + return (struct elf_phdr *)((size_t)hdr + (size_t)hdr->e_phoff); +} + +/* Return idx program header */ +static inline struct elf_phdr *elf_program(struct elfhdr *hdr, int idx) +{ + return &elf_pheader(hdr)[idx]; +} + +/* Retunr section's string table header */ +static inline char *elf_str_table(struct elfhdr *hdr) +{ + if (hdr->e_shstrndx == SHN_UNDEF) + return NULL; + return (char *)hdr + elf_section(hdr, hdr->e_shstrndx)->sh_offset; +} + /* Optional callbacks to write extra ELF notes. */ struct file; struct coredump_params;