118 lines
4.7 KiB
C
118 lines
4.7 KiB
C
#ifndef COSMOPOLITAN_LIBC_ELF_H_
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#define COSMOPOLITAN_LIBC_ELF_H_
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#ifndef __STRICT_ANSI__
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#include "libc/bits/safemacros.h"
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#include "libc/elf/def.h"
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#include "libc/elf/struct/ehdr.h"
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#include "libc/elf/struct/phdr.h"
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#include "libc/elf/struct/shdr.h"
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#include "libc/elf/struct/sym.h"
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#include "libc/limits.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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/*───────────────────────────────────────────────────────────────────────────│─╗
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│ cosmopolitan § executable & linkable format ─╬─│┼
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╚────────────────────────────────────────────────────────────────────────────│*/
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struct MappedFile;
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Elf64_Ehdr *mapelfread(const char *, struct MappedFile *);
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char *GetElfStringTable(const Elf64_Ehdr *, size_t);
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Elf64_Sym *GetElfSymbolTable(const Elf64_Ehdr *, size_t, Elf64_Xword *);
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bool IsElf64Binary(const Elf64_Ehdr *, size_t);
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forceinline void checkelfaddress(const Elf64_Ehdr *elf, size_t mapsize,
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intptr_t addr, size_t addrsize) {
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#if !(TRUSTWORTHY + ELF_TRUSTWORTHY + 0) || ELF_UNTRUSTWORTHY + 0
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if (addr < (intptr_t)elf || addr + addrsize > (intptr_t)elf + mapsize) {
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abort();
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}
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#endif
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}
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static inline bool iselfsymbolcontent(const Elf64_Sym *sym) {
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return sym->st_size > 0 && (ELF64_ST_TYPE(sym->st_info) == STT_FUNC ||
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ELF64_ST_TYPE(sym->st_info) == STT_OBJECT);
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}
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static inline Elf64_Phdr *getelfsegmentheaderaddress(const Elf64_Ehdr *elf,
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size_t mapsize,
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unsigned i) {
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intptr_t addr =
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((intptr_t)elf + (intptr_t)elf->e_phoff + (intptr_t)elf->e_phentsize * i);
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checkelfaddress(elf, mapsize, addr, elf->e_phentsize);
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return (Elf64_Phdr *)addr;
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}
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static inline Elf64_Shdr *getelfsectionheaderaddress(const Elf64_Ehdr *elf,
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size_t mapsize,
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Elf64_Half i) {
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intptr_t addr =
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((intptr_t)elf + (intptr_t)elf->e_shoff + (intptr_t)elf->e_shentsize * i);
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checkelfaddress(elf, mapsize, addr, elf->e_shentsize);
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return (Elf64_Shdr *)addr;
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}
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static inline void *getelfsectionaddress(const Elf64_Ehdr *elf, size_t mapsize,
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const Elf64_Shdr *shdr) {
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intptr_t addr, size;
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addr = (intptr_t)elf + (intptr_t)shdr->sh_offset;
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size = (intptr_t)shdr->sh_size;
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checkelfaddress(elf, mapsize, addr, size);
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return (void *)addr;
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}
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static inline char *getelfsectionnamestringtable(const Elf64_Ehdr *elf,
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size_t mapsize) {
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if (!elf->e_shoff || !elf->e_shentsize) return NULL;
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return getelfsectionaddress(
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elf, mapsize, getelfsectionheaderaddress(elf, mapsize, elf->e_shstrndx));
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}
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static inline void getelfvirtualaddressrange(const Elf64_Ehdr *elf,
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size_t elfsize,
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intptr_t *out_start,
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intptr_t *out_end) {
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unsigned i;
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Elf64_Phdr *phdr;
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intptr_t start, end, pstart, pend;
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start = INTPTR_MAX;
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end = 0;
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for (i = 0; i < elf->e_phnum; ++i) {
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phdr = getelfsegmentheaderaddress(elf, elfsize, i);
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if (phdr->p_type != PT_LOAD) continue;
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pstart = phdr->p_vaddr;
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pend = phdr->p_vaddr + phdr->p_memsz;
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if (pstart < start) start = pstart;
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if (pend > end) end = pend;
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}
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if (out_start) *out_start = start;
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if (out_end) *out_end = end;
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}
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static inline char *GetElfString(const Elf64_Ehdr *elf, size_t mapsize,
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const char *strtab, Elf64_Word rva) {
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intptr_t addr = (intptr_t)strtab + rva;
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#if !(TRUSTWORTHY + ELF_TRUSTWORTHY + 0)
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checkelfaddress(elf, mapsize, addr, 0);
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checkelfaddress(elf, mapsize, addr,
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strnlen((char *)addr, (intptr_t)elf + mapsize - addr) + 1);
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#endif
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return (char *)addr;
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}
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static inline const char *GetElfSectionName(const Elf64_Ehdr *elf,
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size_t mapsize, Elf64_Shdr *shdr) {
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if (!elf || !shdr) return NULL;
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return GetElfString(elf, mapsize, getelfsectionnamestringtable(elf, mapsize),
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shdr->sh_name);
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}
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* !ANSI */
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#endif /* COSMOPOLITAN_LIBC_ELF_H_ */
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