To differentiate barebox-specific API from universal ELF definitions, move everything from elf.h into linux/elf.h and have elf.h include the new header. This is in preparation for the next commit, which will move things out of <linux/elf.h>, but now that we got the file addition out of the way, the diff will be better readable.
Signed-off-by: Ahmad Fatoum <[email protected]> --- include/elf.h | 522 +------------------------------------------- include/linux/elf.h | 521 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 525 insertions(+), 518 deletions(-) create mode 100644 include/linux/elf.h diff --git a/include/elf.h b/include/elf.h index f54145e4af37..872f9e39fee4 100644 --- a/include/elf.h +++ b/include/elf.h @@ -1,521 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0-only */ -#ifndef _LINUX_ELF_H -#define _LINUX_ELF_H +#ifndef __ELF_H +#define __ELF_H -#include <linux/types.h> -#include <linux/list.h> -//#include <linux/auxvec.h> -//#include <linux/elf-em.h> -#include <asm/elf.h> +#include <linux/elf.h> -struct file; - -#ifndef elf_read_implies_exec - /* Executables for which elf_read_implies_exec() returns TRUE will - have the READ_IMPLIES_EXEC personality flag set automatically. - Override in asm/elf.h as needed. */ -# define elf_read_implies_exec(ex, have_pt_gnu_stack) 0 -#endif - -/* 32-bit ELF base types. */ -typedef __u32 Elf32_Addr; -typedef __u16 Elf32_Half; -typedef __u32 Elf32_Off; -typedef __s32 Elf32_Sword; -typedef __u32 Elf32_Word; - -/* 64-bit ELF base types. */ -typedef __u64 Elf64_Addr; -typedef __u16 Elf64_Half; -typedef __s16 Elf64_SHalf; -typedef __u64 Elf64_Off; -typedef __s32 Elf64_Sword; -typedef __u32 Elf64_Word; -typedef __u64 Elf64_Xword; -typedef __s64 Elf64_Sxword; - -/* These constants are for the segment types stored in the image headers */ -#define PT_NULL 0 -#define PT_LOAD 1 -#define PT_DYNAMIC 2 -#define PT_INTERP 3 -#define PT_NOTE 4 -#define PT_SHLIB 5 -#define PT_PHDR 6 -#define PT_TLS 7 /* Thread local storage segment */ -#define PT_LOOS 0x60000000 /* OS-specific */ -#define PT_HIOS 0x6fffffff /* OS-specific */ -#define PT_LOPROC 0x70000000 -#define PT_HIPROC 0x7fffffff -#define PT_GNU_EH_FRAME 0x6474e550 - -#define PT_GNU_STACK (PT_LOOS + 0x474e551) - -/* These constants define the different elf file types */ -#define ET_NONE 0 -#define ET_REL 1 -#define ET_EXEC 2 -#define ET_DYN 3 -#define ET_CORE 4 -#define ET_LOPROC 0xff00 -#define ET_HIPROC 0xffff - -/* This is the info that is needed to parse the dynamic section of the file */ -#define DT_NULL 0 -#define DT_NEEDED 1 -#define DT_PLTRELSZ 2 -#define DT_PLTGOT 3 -#define DT_HASH 4 -#define DT_STRTAB 5 -#define DT_SYMTAB 6 -#define DT_RELA 7 -#define DT_RELASZ 8 -#define DT_RELAENT 9 -#define DT_STRSZ 10 -#define DT_SYMENT 11 -#define DT_INIT 12 -#define DT_FINI 13 -#define DT_SONAME 14 -#define DT_RPATH 15 -#define DT_SYMBOLIC 16 -#define DT_REL 17 -#define DT_RELSZ 18 -#define DT_RELENT 19 -#define DT_PLTREL 20 -#define DT_DEBUG 21 -#define DT_TEXTREL 22 -#define DT_JMPREL 23 -#define DT_ENCODING 32 -#define OLD_DT_LOOS 0x60000000 -#define DT_LOOS 0x6000000d -#define DT_HIOS 0x6ffff000 -#define DT_VALRNGLO 0x6ffffd00 -#define DT_VALRNGHI 0x6ffffdff -#define DT_ADDRRNGLO 0x6ffffe00 -#define DT_ADDRRNGHI 0x6ffffeff -#define DT_VERSYM 0x6ffffff0 -#define DT_RELACOUNT 0x6ffffff9 -#define DT_RELCOUNT 0x6ffffffa -#define DT_FLAGS_1 0x6ffffffb -#define DT_VERDEF 0x6ffffffc -#define DT_VERDEFNUM 0x6ffffffd -#define DT_VERNEED 0x6ffffffe -#define DT_VERNEEDNUM 0x6fffffff -#define OLD_DT_HIOS 0x6fffffff -#define DT_LOPROC 0x70000000 -#define DT_HIPROC 0x7fffffff - -/* This info is needed when parsing the symbol table */ -#define STB_LOCAL 0 -#define STB_GLOBAL 1 -#define STB_WEAK 2 - -#define STT_NOTYPE 0 -#define STT_OBJECT 1 -#define STT_FUNC 2 -#define STT_SECTION 3 -#define STT_FILE 4 -#define STT_COMMON 5 -#define STT_TLS 6 - -#define ELF_ST_BIND(x) ((x) >> 4) -#define ELF_ST_TYPE(x) (((unsigned int) x) & 0xf) -#define ELF32_ST_BIND(x) ELF_ST_BIND(x) -#define ELF32_ST_TYPE(x) ELF_ST_TYPE(x) -#define ELF64_ST_BIND(x) ELF_ST_BIND(x) -#define ELF64_ST_TYPE(x) ELF_ST_TYPE(x) - -typedef struct dynamic{ - Elf32_Sword d_tag; - union{ - Elf32_Sword d_val; - Elf32_Addr d_ptr; - } d_un; -} Elf32_Dyn; - -typedef struct { - Elf64_Sxword d_tag; /* entry tag value */ - union { - Elf64_Xword d_val; - Elf64_Addr d_ptr; - } d_un; -} Elf64_Dyn; - -/* The following are used with relocations */ -#define ELF32_R_SYM(x) ((x) >> 8) -#define ELF32_R_TYPE(x) ((x) & 0xff) - -#define ELF64_R_SYM(i) ((i) >> 32) -#define ELF64_R_TYPE(i) ((i) & 0xffffffff) - -typedef struct elf32_rel { - Elf32_Addr r_offset; - Elf32_Word r_info; -} Elf32_Rel; - -typedef struct elf64_rel { - Elf64_Addr r_offset; /* Location at which to apply the action */ - Elf64_Xword r_info; /* index and type of relocation */ -} Elf64_Rel; - -typedef struct elf32_rela{ - Elf32_Addr r_offset; - Elf32_Word r_info; - Elf32_Sword r_addend; -} Elf32_Rela; - -typedef struct elf64_rela { - Elf64_Addr r_offset; /* Location at which to apply the action */ - Elf64_Xword r_info; /* index and type of relocation */ - Elf64_Sxword r_addend; /* Constant addend used to compute value */ -} Elf64_Rela; - -typedef struct elf32_sym{ - Elf32_Word st_name; - Elf32_Addr st_value; - Elf32_Word st_size; - unsigned char st_info; - unsigned char st_other; - Elf32_Half st_shndx; -} Elf32_Sym; - -typedef struct elf64_sym { - Elf64_Word st_name; /* Symbol name, index in string tbl */ - unsigned char st_info; /* Type and binding attributes */ - unsigned char st_other; /* No defined meaning, 0 */ - Elf64_Half st_shndx; /* Associated section index */ - Elf64_Addr st_value; /* Value of the symbol */ - Elf64_Xword st_size; /* Associated symbol size */ -} Elf64_Sym; - - -#define EI_NIDENT 16 - -typedef struct elf32_hdr{ - unsigned char e_ident[EI_NIDENT]; - Elf32_Half e_type; - Elf32_Half e_machine; - Elf32_Word e_version; - Elf32_Addr e_entry; /* Entry point */ - Elf32_Off e_phoff; - Elf32_Off e_shoff; - Elf32_Word e_flags; - Elf32_Half e_ehsize; - Elf32_Half e_phentsize; - Elf32_Half e_phnum; - Elf32_Half e_shentsize; - Elf32_Half e_shnum; - Elf32_Half e_shstrndx; -} Elf32_Ehdr; - -typedef struct elf64_hdr { - unsigned char e_ident[EI_NIDENT]; /* ELF "magic number" */ - Elf64_Half e_type; - Elf64_Half e_machine; - Elf64_Word e_version; - Elf64_Addr e_entry; /* Entry point virtual address */ - Elf64_Off e_phoff; /* Program header table file offset */ - Elf64_Off e_shoff; /* Section header table file offset */ - Elf64_Word e_flags; - Elf64_Half e_ehsize; - Elf64_Half e_phentsize; - Elf64_Half e_phnum; - Elf64_Half e_shentsize; - Elf64_Half e_shnum; - Elf64_Half e_shstrndx; -} Elf64_Ehdr; - -/* These constants define the permissions on sections in the program - header, p_flags. */ -#define PF_R 0x4 -#define PF_W 0x2 -#define PF_X 0x1 - -typedef struct elf32_phdr{ - Elf32_Word p_type; - Elf32_Off p_offset; - Elf32_Addr p_vaddr; - Elf32_Addr p_paddr; - Elf32_Word p_filesz; - Elf32_Word p_memsz; - Elf32_Word p_flags; - Elf32_Word p_align; -} Elf32_Phdr; - -typedef struct elf64_phdr { - Elf64_Word p_type; - Elf64_Word p_flags; - Elf64_Off p_offset; /* Segment file offset */ - Elf64_Addr p_vaddr; /* Segment virtual address */ - Elf64_Addr p_paddr; /* Segment physical address */ - Elf64_Xword p_filesz; /* Segment size in file */ - Elf64_Xword p_memsz; /* Segment size in memory */ - Elf64_Xword p_align; /* Segment alignment, file & memory */ -} Elf64_Phdr; - -/* sh_type */ -#define SHT_NULL 0 -#define SHT_PROGBITS 1 -#define SHT_SYMTAB 2 -#define SHT_STRTAB 3 -#define SHT_RELA 4 -#define SHT_HASH 5 -#define SHT_DYNAMIC 6 -#define SHT_NOTE 7 -#define SHT_NOBITS 8 -#define SHT_REL 9 -#define SHT_SHLIB 10 -#define SHT_DYNSYM 11 -#define SHT_NUM 12 -#define SHT_LOPROC 0x70000000 -#define SHT_HIPROC 0x7fffffff -#define SHT_LOUSER 0x80000000 -#define SHT_HIUSER 0xffffffff - -/* sh_flags */ -#define SHF_WRITE 0x1 -#define SHF_ALLOC 0x2 -#define SHF_EXECINSTR 0x4 -#define SHF_MASKPROC 0xf0000000 - -/* special section indexes */ -#define SHN_UNDEF 0 -#define SHN_LORESERVE 0xff00 -#define SHN_LOPROC 0xff00 -#define SHN_HIPROC 0xff1f -#define SHN_ABS 0xfff1 -#define SHN_COMMON 0xfff2 -#define SHN_HIRESERVE 0xffff - -typedef struct elf32_shdr { - Elf32_Word sh_name; - Elf32_Word sh_type; - Elf32_Word sh_flags; - Elf32_Addr sh_addr; - Elf32_Off sh_offset; - Elf32_Word sh_size; - Elf32_Word sh_link; - Elf32_Word sh_info; - Elf32_Word sh_addralign; - Elf32_Word sh_entsize; -} Elf32_Shdr; - -typedef struct elf64_shdr { - Elf64_Word sh_name; /* Section name, index in string tbl */ - Elf64_Word sh_type; /* Type of section */ - Elf64_Xword sh_flags; /* Miscellaneous section attributes */ - Elf64_Addr sh_addr; /* Section virtual addr at execution */ - Elf64_Off sh_offset; /* Section file offset */ - Elf64_Xword sh_size; /* Size of section in bytes */ - Elf64_Word sh_link; /* Index of another section */ - Elf64_Word sh_info; /* Additional section information */ - Elf64_Xword sh_addralign; /* Section alignment */ - Elf64_Xword sh_entsize; /* Entry size if section holds table */ -} Elf64_Shdr; - -#define EI_MAG0 0 /* e_ident[] indexes */ -#define EI_MAG1 1 -#define EI_MAG2 2 -#define EI_MAG3 3 -#define EI_CLASS 4 -#define EI_DATA 5 -#define EI_VERSION 6 -#define EI_OSABI 7 -#define EI_PAD 8 - -#define ELFMAG0 0x7f /* EI_MAG */ -#define ELFMAG1 'E' -#define ELFMAG2 'L' -#define ELFMAG3 'F' -#define ELFMAG "\177ELF" -#define SELFMAG 4 - -#define ELFCLASSNONE 0 /* EI_CLASS */ -#define ELFCLASS32 1 -#define ELFCLASS64 2 -#define ELFCLASSNUM 3 - -#define ELFDATANONE 0 /* e_ident[EI_DATA] */ -#define ELFDATA2LSB 1 -#define ELFDATA2MSB 2 - -#define EV_NONE 0 /* e_version, EI_VERSION */ -#define EV_CURRENT 1 -#define EV_NUM 2 - -#define ELFOSABI_NONE 0 -#define ELFOSABI_LINUX 3 - -#ifndef ELF_OSABI -#define ELF_OSABI ELFOSABI_NONE -#endif - -/* Notes used in ET_CORE */ -#define NT_PRSTATUS 1 -#define NT_PRFPREG 2 -#define NT_PRPSINFO 3 -#define NT_TASKSTRUCT 4 -#define NT_AUXV 6 -#define NT_PRXFPREG 0x46e62b7f /* copied from gdb5.1/include/elf/common.h */ - - -/* Note header in a PT_NOTE section */ -typedef struct elf32_note { - Elf32_Word n_namesz; /* Name size */ - Elf32_Word n_descsz; /* Content size */ - Elf32_Word n_type; /* Content type */ -} Elf32_Nhdr; - -/* Note header in a PT_NOTE section */ -typedef struct elf64_note { - Elf64_Word n_namesz; /* Name size */ - Elf64_Word n_descsz; /* Content size */ - Elf64_Word n_type; /* Content type */ -} Elf64_Nhdr; - -#if ELF_CLASS == ELFCLASS32 - -extern Elf32_Dyn _DYNAMIC []; -#define elfhdr elf32_hdr -#define elf_phdr elf32_phdr -#define elf_note elf32_note -#define elf_addr_t Elf32_Off - -#else - -extern Elf64_Dyn _DYNAMIC []; -#define elfhdr elf64_hdr -#define elf_phdr elf64_phdr -#define elf_note elf64_note -#define elf_addr_t Elf64_Off - -#endif - -struct elf_image { - struct list_head list; - u8 class; - u16 type; /* ET_EXEC or ET_DYN */ - u64 entry; - void *low_addr; - void *high_addr; - void *hdr_buf; - const char *filename; - void *load_address; /* User-specified load address (NULL = use p_paddr) */ - void *base_load_addr; /* Calculated base address for ET_DYN */ - unsigned long reloc_offset; /* Offset between p_vaddr and actual load address */ -}; - -static inline size_t elf_get_mem_size(struct elf_image *elf) -{ - return elf->high_addr - elf->low_addr; -} - -int elf_open_binary_into(struct elf_image *elf, void *buf); -struct elf_image *elf_open_binary(void *buf); -struct elf_image *elf_open(const char *filename); -void elf_close(struct elf_image *elf); -int elf_load(struct elf_image *elf); - -/* - * Set the load address for the ELF file. - * Must be called before elf_load(). - * If not set, ET_EXEC uses p_paddr, ET_DYN uses lowest p_paddr. - */ -void elf_set_load_address(struct elf_image *elf, void *addr); - -/* - * Apply dynamic relocations to an ELF binary already loaded in memory. - * This modifies the ELF image in place without allocating new memory. - * Useful for self-relocating loaders or externally loaded binaries. - * The elf parameter must have been previously opened with elf_open_binary(). - */ -int elf_load_inplace(struct elf_image *elf); - -/* - * Architecture-specific relocation handler. - * Returns 0 on success, -ENOSYS if architecture doesn't support relocations, - * other negative error codes on failure. - */ -int elf_apply_relocations(struct elf_image *elf, const void *dyn_seg); - -/* - * Parse the dynamic section and extract relocation information. - * This is a generic function that works for both 32-bit and 64-bit ELF files, - * and handles both REL and RELA relocation formats. - * Returns 0 on success, -EINVAL on error. - */ -int elf_parse_dynamic_section_rel(struct elf_image *elf, const void *dyn_seg, - void **rel_out, u64 *relsz_out, void **symtab); -int elf_parse_dynamic_section_rela(struct elf_image *elf, const void *dyn_seg, - void **rel_out, u64 *relsz_out, void **symtab); - -#define ELF_GET_FIELD(__s, __field, __type) \ -static inline __type elf_##__s##_##__field(struct elf_image *elf, void *arg) { \ - if (elf->class == ELFCLASS32) \ - return (__type) ((struct elf32_##__s *) arg)->__field; \ - else \ - return (__type) ((struct elf64_##__s *) arg)->__field; \ -} - -ELF_GET_FIELD(hdr, e_entry, u64) -ELF_GET_FIELD(hdr, e_phnum, u16) -ELF_GET_FIELD(hdr, e_phoff, u64) -ELF_GET_FIELD(hdr, e_phentsize, u16) -ELF_GET_FIELD(hdr, e_type, u16) -ELF_GET_FIELD(hdr, e_machine, u16) -ELF_GET_FIELD(phdr, p_paddr, u64) -ELF_GET_FIELD(phdr, p_vaddr, u64) -ELF_GET_FIELD(phdr, p_filesz, u64) -ELF_GET_FIELD(phdr, p_memsz, u64) -ELF_GET_FIELD(phdr, p_type, u32) -ELF_GET_FIELD(phdr, p_offset, u64) -ELF_GET_FIELD(phdr, p_flags, u32) - -static inline unsigned long elf_size_of_phdr(struct elf_image *elf) -{ - if (elf->class == ELFCLASS32) - return sizeof(Elf32_Phdr); - else - return sizeof(Elf64_Phdr); -} - -#define elf_for_each_segment(phdr, elf, buf) \ - for (phdr = (void *)buf + elf_hdr_e_phoff(elf, buf); \ - phdr < (void *)buf + elf_hdr_e_phoff(elf, buf) + \ - elf_hdr_e_phnum(elf, buf) * elf_size_of_phdr(elf); \ - phdr = (void *)phdr + elf_size_of_phdr(elf)) - -/* Dynamic section accessors */ -static inline s64 elf_dyn_d_tag(struct elf_image *elf, const void *arg) -{ - if (elf->class == ELFCLASS32) - return (s64)((Elf32_Dyn *)arg)->d_tag; - else - return (s64)((Elf64_Dyn *)arg)->d_tag; -} - -static inline u64 elf_dyn_d_val(struct elf_image *elf, const void *arg) -{ - if (elf->class == ELFCLASS32) - return (u64)((Elf32_Dyn *)arg)->d_un.d_val; - else - return (u64)((Elf64_Dyn *)arg)->d_un.d_val; -} - -static inline u64 elf_dyn_d_ptr(struct elf_image *elf, const void *arg) -{ - if (elf->class == ELFCLASS32) - return (u64)((Elf32_Dyn *)arg)->d_un.d_ptr; - else - return (u64)((Elf64_Dyn *)arg)->d_un.d_ptr; -} - -static inline unsigned long elf_size_of_dyn(struct elf_image *elf) -{ - if (elf->class == ELFCLASS32) - return sizeof(Elf32_Dyn); - else - return sizeof(Elf64_Dyn); -} - -#endif /* _LINUX_ELF_H */ +#endif /* __ELF_H */ diff --git a/include/linux/elf.h b/include/linux/elf.h new file mode 100644 index 000000000000..f54145e4af37 --- /dev/null +++ b/include/linux/elf.h @@ -0,0 +1,521 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef _LINUX_ELF_H +#define _LINUX_ELF_H + +#include <linux/types.h> +#include <linux/list.h> +//#include <linux/auxvec.h> +//#include <linux/elf-em.h> +#include <asm/elf.h> + +struct file; + +#ifndef elf_read_implies_exec + /* Executables for which elf_read_implies_exec() returns TRUE will + have the READ_IMPLIES_EXEC personality flag set automatically. + Override in asm/elf.h as needed. */ +# define elf_read_implies_exec(ex, have_pt_gnu_stack) 0 +#endif + +/* 32-bit ELF base types. */ +typedef __u32 Elf32_Addr; +typedef __u16 Elf32_Half; +typedef __u32 Elf32_Off; +typedef __s32 Elf32_Sword; +typedef __u32 Elf32_Word; + +/* 64-bit ELF base types. */ +typedef __u64 Elf64_Addr; +typedef __u16 Elf64_Half; +typedef __s16 Elf64_SHalf; +typedef __u64 Elf64_Off; +typedef __s32 Elf64_Sword; +typedef __u32 Elf64_Word; +typedef __u64 Elf64_Xword; +typedef __s64 Elf64_Sxword; + +/* These constants are for the segment types stored in the image headers */ +#define PT_NULL 0 +#define PT_LOAD 1 +#define PT_DYNAMIC 2 +#define PT_INTERP 3 +#define PT_NOTE 4 +#define PT_SHLIB 5 +#define PT_PHDR 6 +#define PT_TLS 7 /* Thread local storage segment */ +#define PT_LOOS 0x60000000 /* OS-specific */ +#define PT_HIOS 0x6fffffff /* OS-specific */ +#define PT_LOPROC 0x70000000 +#define PT_HIPROC 0x7fffffff +#define PT_GNU_EH_FRAME 0x6474e550 + +#define PT_GNU_STACK (PT_LOOS + 0x474e551) + +/* These constants define the different elf file types */ +#define ET_NONE 0 +#define ET_REL 1 +#define ET_EXEC 2 +#define ET_DYN 3 +#define ET_CORE 4 +#define ET_LOPROC 0xff00 +#define ET_HIPROC 0xffff + +/* This is the info that is needed to parse the dynamic section of the file */ +#define DT_NULL 0 +#define DT_NEEDED 1 +#define DT_PLTRELSZ 2 +#define DT_PLTGOT 3 +#define DT_HASH 4 +#define DT_STRTAB 5 +#define DT_SYMTAB 6 +#define DT_RELA 7 +#define DT_RELASZ 8 +#define DT_RELAENT 9 +#define DT_STRSZ 10 +#define DT_SYMENT 11 +#define DT_INIT 12 +#define DT_FINI 13 +#define DT_SONAME 14 +#define DT_RPATH 15 +#define DT_SYMBOLIC 16 +#define DT_REL 17 +#define DT_RELSZ 18 +#define DT_RELENT 19 +#define DT_PLTREL 20 +#define DT_DEBUG 21 +#define DT_TEXTREL 22 +#define DT_JMPREL 23 +#define DT_ENCODING 32 +#define OLD_DT_LOOS 0x60000000 +#define DT_LOOS 0x6000000d +#define DT_HIOS 0x6ffff000 +#define DT_VALRNGLO 0x6ffffd00 +#define DT_VALRNGHI 0x6ffffdff +#define DT_ADDRRNGLO 0x6ffffe00 +#define DT_ADDRRNGHI 0x6ffffeff +#define DT_VERSYM 0x6ffffff0 +#define DT_RELACOUNT 0x6ffffff9 +#define DT_RELCOUNT 0x6ffffffa +#define DT_FLAGS_1 0x6ffffffb +#define DT_VERDEF 0x6ffffffc +#define DT_VERDEFNUM 0x6ffffffd +#define DT_VERNEED 0x6ffffffe +#define DT_VERNEEDNUM 0x6fffffff +#define OLD_DT_HIOS 0x6fffffff +#define DT_LOPROC 0x70000000 +#define DT_HIPROC 0x7fffffff + +/* This info is needed when parsing the symbol table */ +#define STB_LOCAL 0 +#define STB_GLOBAL 1 +#define STB_WEAK 2 + +#define STT_NOTYPE 0 +#define STT_OBJECT 1 +#define STT_FUNC 2 +#define STT_SECTION 3 +#define STT_FILE 4 +#define STT_COMMON 5 +#define STT_TLS 6 + +#define ELF_ST_BIND(x) ((x) >> 4) +#define ELF_ST_TYPE(x) (((unsigned int) x) & 0xf) +#define ELF32_ST_BIND(x) ELF_ST_BIND(x) +#define ELF32_ST_TYPE(x) ELF_ST_TYPE(x) +#define ELF64_ST_BIND(x) ELF_ST_BIND(x) +#define ELF64_ST_TYPE(x) ELF_ST_TYPE(x) + +typedef struct dynamic{ + Elf32_Sword d_tag; + union{ + Elf32_Sword d_val; + Elf32_Addr d_ptr; + } d_un; +} Elf32_Dyn; + +typedef struct { + Elf64_Sxword d_tag; /* entry tag value */ + union { + Elf64_Xword d_val; + Elf64_Addr d_ptr; + } d_un; +} Elf64_Dyn; + +/* The following are used with relocations */ +#define ELF32_R_SYM(x) ((x) >> 8) +#define ELF32_R_TYPE(x) ((x) & 0xff) + +#define ELF64_R_SYM(i) ((i) >> 32) +#define ELF64_R_TYPE(i) ((i) & 0xffffffff) + +typedef struct elf32_rel { + Elf32_Addr r_offset; + Elf32_Word r_info; +} Elf32_Rel; + +typedef struct elf64_rel { + Elf64_Addr r_offset; /* Location at which to apply the action */ + Elf64_Xword r_info; /* index and type of relocation */ +} Elf64_Rel; + +typedef struct elf32_rela{ + Elf32_Addr r_offset; + Elf32_Word r_info; + Elf32_Sword r_addend; +} Elf32_Rela; + +typedef struct elf64_rela { + Elf64_Addr r_offset; /* Location at which to apply the action */ + Elf64_Xword r_info; /* index and type of relocation */ + Elf64_Sxword r_addend; /* Constant addend used to compute value */ +} Elf64_Rela; + +typedef struct elf32_sym{ + Elf32_Word st_name; + Elf32_Addr st_value; + Elf32_Word st_size; + unsigned char st_info; + unsigned char st_other; + Elf32_Half st_shndx; +} Elf32_Sym; + +typedef struct elf64_sym { + Elf64_Word st_name; /* Symbol name, index in string tbl */ + unsigned char st_info; /* Type and binding attributes */ + unsigned char st_other; /* No defined meaning, 0 */ + Elf64_Half st_shndx; /* Associated section index */ + Elf64_Addr st_value; /* Value of the symbol */ + Elf64_Xword st_size; /* Associated symbol size */ +} Elf64_Sym; + + +#define EI_NIDENT 16 + +typedef struct elf32_hdr{ + unsigned char e_ident[EI_NIDENT]; + Elf32_Half e_type; + Elf32_Half e_machine; + Elf32_Word e_version; + Elf32_Addr e_entry; /* Entry point */ + Elf32_Off e_phoff; + Elf32_Off e_shoff; + Elf32_Word e_flags; + Elf32_Half e_ehsize; + Elf32_Half e_phentsize; + Elf32_Half e_phnum; + Elf32_Half e_shentsize; + Elf32_Half e_shnum; + Elf32_Half e_shstrndx; +} Elf32_Ehdr; + +typedef struct elf64_hdr { + unsigned char e_ident[EI_NIDENT]; /* ELF "magic number" */ + Elf64_Half e_type; + Elf64_Half e_machine; + Elf64_Word e_version; + Elf64_Addr e_entry; /* Entry point virtual address */ + Elf64_Off e_phoff; /* Program header table file offset */ + Elf64_Off e_shoff; /* Section header table file offset */ + Elf64_Word e_flags; + Elf64_Half e_ehsize; + Elf64_Half e_phentsize; + Elf64_Half e_phnum; + Elf64_Half e_shentsize; + Elf64_Half e_shnum; + Elf64_Half e_shstrndx; +} Elf64_Ehdr; + +/* These constants define the permissions on sections in the program + header, p_flags. */ +#define PF_R 0x4 +#define PF_W 0x2 +#define PF_X 0x1 + +typedef struct elf32_phdr{ + Elf32_Word p_type; + Elf32_Off p_offset; + Elf32_Addr p_vaddr; + Elf32_Addr p_paddr; + Elf32_Word p_filesz; + Elf32_Word p_memsz; + Elf32_Word p_flags; + Elf32_Word p_align; +} Elf32_Phdr; + +typedef struct elf64_phdr { + Elf64_Word p_type; + Elf64_Word p_flags; + Elf64_Off p_offset; /* Segment file offset */ + Elf64_Addr p_vaddr; /* Segment virtual address */ + Elf64_Addr p_paddr; /* Segment physical address */ + Elf64_Xword p_filesz; /* Segment size in file */ + Elf64_Xword p_memsz; /* Segment size in memory */ + Elf64_Xword p_align; /* Segment alignment, file & memory */ +} Elf64_Phdr; + +/* sh_type */ +#define SHT_NULL 0 +#define SHT_PROGBITS 1 +#define SHT_SYMTAB 2 +#define SHT_STRTAB 3 +#define SHT_RELA 4 +#define SHT_HASH 5 +#define SHT_DYNAMIC 6 +#define SHT_NOTE 7 +#define SHT_NOBITS 8 +#define SHT_REL 9 +#define SHT_SHLIB 10 +#define SHT_DYNSYM 11 +#define SHT_NUM 12 +#define SHT_LOPROC 0x70000000 +#define SHT_HIPROC 0x7fffffff +#define SHT_LOUSER 0x80000000 +#define SHT_HIUSER 0xffffffff + +/* sh_flags */ +#define SHF_WRITE 0x1 +#define SHF_ALLOC 0x2 +#define SHF_EXECINSTR 0x4 +#define SHF_MASKPROC 0xf0000000 + +/* special section indexes */ +#define SHN_UNDEF 0 +#define SHN_LORESERVE 0xff00 +#define SHN_LOPROC 0xff00 +#define SHN_HIPROC 0xff1f +#define SHN_ABS 0xfff1 +#define SHN_COMMON 0xfff2 +#define SHN_HIRESERVE 0xffff + +typedef struct elf32_shdr { + Elf32_Word sh_name; + Elf32_Word sh_type; + Elf32_Word sh_flags; + Elf32_Addr sh_addr; + Elf32_Off sh_offset; + Elf32_Word sh_size; + Elf32_Word sh_link; + Elf32_Word sh_info; + Elf32_Word sh_addralign; + Elf32_Word sh_entsize; +} Elf32_Shdr; + +typedef struct elf64_shdr { + Elf64_Word sh_name; /* Section name, index in string tbl */ + Elf64_Word sh_type; /* Type of section */ + Elf64_Xword sh_flags; /* Miscellaneous section attributes */ + Elf64_Addr sh_addr; /* Section virtual addr at execution */ + Elf64_Off sh_offset; /* Section file offset */ + Elf64_Xword sh_size; /* Size of section in bytes */ + Elf64_Word sh_link; /* Index of another section */ + Elf64_Word sh_info; /* Additional section information */ + Elf64_Xword sh_addralign; /* Section alignment */ + Elf64_Xword sh_entsize; /* Entry size if section holds table */ +} Elf64_Shdr; + +#define EI_MAG0 0 /* e_ident[] indexes */ +#define EI_MAG1 1 +#define EI_MAG2 2 +#define EI_MAG3 3 +#define EI_CLASS 4 +#define EI_DATA 5 +#define EI_VERSION 6 +#define EI_OSABI 7 +#define EI_PAD 8 + +#define ELFMAG0 0x7f /* EI_MAG */ +#define ELFMAG1 'E' +#define ELFMAG2 'L' +#define ELFMAG3 'F' +#define ELFMAG "\177ELF" +#define SELFMAG 4 + +#define ELFCLASSNONE 0 /* EI_CLASS */ +#define ELFCLASS32 1 +#define ELFCLASS64 2 +#define ELFCLASSNUM 3 + +#define ELFDATANONE 0 /* e_ident[EI_DATA] */ +#define ELFDATA2LSB 1 +#define ELFDATA2MSB 2 + +#define EV_NONE 0 /* e_version, EI_VERSION */ +#define EV_CURRENT 1 +#define EV_NUM 2 + +#define ELFOSABI_NONE 0 +#define ELFOSABI_LINUX 3 + +#ifndef ELF_OSABI +#define ELF_OSABI ELFOSABI_NONE +#endif + +/* Notes used in ET_CORE */ +#define NT_PRSTATUS 1 +#define NT_PRFPREG 2 +#define NT_PRPSINFO 3 +#define NT_TASKSTRUCT 4 +#define NT_AUXV 6 +#define NT_PRXFPREG 0x46e62b7f /* copied from gdb5.1/include/elf/common.h */ + + +/* Note header in a PT_NOTE section */ +typedef struct elf32_note { + Elf32_Word n_namesz; /* Name size */ + Elf32_Word n_descsz; /* Content size */ + Elf32_Word n_type; /* Content type */ +} Elf32_Nhdr; + +/* Note header in a PT_NOTE section */ +typedef struct elf64_note { + Elf64_Word n_namesz; /* Name size */ + Elf64_Word n_descsz; /* Content size */ + Elf64_Word n_type; /* Content type */ +} Elf64_Nhdr; + +#if ELF_CLASS == ELFCLASS32 + +extern Elf32_Dyn _DYNAMIC []; +#define elfhdr elf32_hdr +#define elf_phdr elf32_phdr +#define elf_note elf32_note +#define elf_addr_t Elf32_Off + +#else + +extern Elf64_Dyn _DYNAMIC []; +#define elfhdr elf64_hdr +#define elf_phdr elf64_phdr +#define elf_note elf64_note +#define elf_addr_t Elf64_Off + +#endif + +struct elf_image { + struct list_head list; + u8 class; + u16 type; /* ET_EXEC or ET_DYN */ + u64 entry; + void *low_addr; + void *high_addr; + void *hdr_buf; + const char *filename; + void *load_address; /* User-specified load address (NULL = use p_paddr) */ + void *base_load_addr; /* Calculated base address for ET_DYN */ + unsigned long reloc_offset; /* Offset between p_vaddr and actual load address */ +}; + +static inline size_t elf_get_mem_size(struct elf_image *elf) +{ + return elf->high_addr - elf->low_addr; +} + +int elf_open_binary_into(struct elf_image *elf, void *buf); +struct elf_image *elf_open_binary(void *buf); +struct elf_image *elf_open(const char *filename); +void elf_close(struct elf_image *elf); +int elf_load(struct elf_image *elf); + +/* + * Set the load address for the ELF file. + * Must be called before elf_load(). + * If not set, ET_EXEC uses p_paddr, ET_DYN uses lowest p_paddr. + */ +void elf_set_load_address(struct elf_image *elf, void *addr); + +/* + * Apply dynamic relocations to an ELF binary already loaded in memory. + * This modifies the ELF image in place without allocating new memory. + * Useful for self-relocating loaders or externally loaded binaries. + * The elf parameter must have been previously opened with elf_open_binary(). + */ +int elf_load_inplace(struct elf_image *elf); + +/* + * Architecture-specific relocation handler. + * Returns 0 on success, -ENOSYS if architecture doesn't support relocations, + * other negative error codes on failure. + */ +int elf_apply_relocations(struct elf_image *elf, const void *dyn_seg); + +/* + * Parse the dynamic section and extract relocation information. + * This is a generic function that works for both 32-bit and 64-bit ELF files, + * and handles both REL and RELA relocation formats. + * Returns 0 on success, -EINVAL on error. + */ +int elf_parse_dynamic_section_rel(struct elf_image *elf, const void *dyn_seg, + void **rel_out, u64 *relsz_out, void **symtab); +int elf_parse_dynamic_section_rela(struct elf_image *elf, const void *dyn_seg, + void **rel_out, u64 *relsz_out, void **symtab); + +#define ELF_GET_FIELD(__s, __field, __type) \ +static inline __type elf_##__s##_##__field(struct elf_image *elf, void *arg) { \ + if (elf->class == ELFCLASS32) \ + return (__type) ((struct elf32_##__s *) arg)->__field; \ + else \ + return (__type) ((struct elf64_##__s *) arg)->__field; \ +} + +ELF_GET_FIELD(hdr, e_entry, u64) +ELF_GET_FIELD(hdr, e_phnum, u16) +ELF_GET_FIELD(hdr, e_phoff, u64) +ELF_GET_FIELD(hdr, e_phentsize, u16) +ELF_GET_FIELD(hdr, e_type, u16) +ELF_GET_FIELD(hdr, e_machine, u16) +ELF_GET_FIELD(phdr, p_paddr, u64) +ELF_GET_FIELD(phdr, p_vaddr, u64) +ELF_GET_FIELD(phdr, p_filesz, u64) +ELF_GET_FIELD(phdr, p_memsz, u64) +ELF_GET_FIELD(phdr, p_type, u32) +ELF_GET_FIELD(phdr, p_offset, u64) +ELF_GET_FIELD(phdr, p_flags, u32) + +static inline unsigned long elf_size_of_phdr(struct elf_image *elf) +{ + if (elf->class == ELFCLASS32) + return sizeof(Elf32_Phdr); + else + return sizeof(Elf64_Phdr); +} + +#define elf_for_each_segment(phdr, elf, buf) \ + for (phdr = (void *)buf + elf_hdr_e_phoff(elf, buf); \ + phdr < (void *)buf + elf_hdr_e_phoff(elf, buf) + \ + elf_hdr_e_phnum(elf, buf) * elf_size_of_phdr(elf); \ + phdr = (void *)phdr + elf_size_of_phdr(elf)) + +/* Dynamic section accessors */ +static inline s64 elf_dyn_d_tag(struct elf_image *elf, const void *arg) +{ + if (elf->class == ELFCLASS32) + return (s64)((Elf32_Dyn *)arg)->d_tag; + else + return (s64)((Elf64_Dyn *)arg)->d_tag; +} + +static inline u64 elf_dyn_d_val(struct elf_image *elf, const void *arg) +{ + if (elf->class == ELFCLASS32) + return (u64)((Elf32_Dyn *)arg)->d_un.d_val; + else + return (u64)((Elf64_Dyn *)arg)->d_un.d_val; +} + +static inline u64 elf_dyn_d_ptr(struct elf_image *elf, const void *arg) +{ + if (elf->class == ELFCLASS32) + return (u64)((Elf32_Dyn *)arg)->d_un.d_ptr; + else + return (u64)((Elf64_Dyn *)arg)->d_un.d_ptr; +} + +static inline unsigned long elf_size_of_dyn(struct elf_image *elf) +{ + if (elf->class == ELFCLASS32) + return sizeof(Elf32_Dyn); + else + return sizeof(Elf64_Dyn); +} + +#endif /* _LINUX_ELF_H */ -- 2.47.3
