You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
117 lines
4.7 KiB
117 lines
4.7 KiB
#ifndef COSMOPOLITAN_LIBC_ELF_H_
|
|
#define COSMOPOLITAN_LIBC_ELF_H_
|
|
#ifndef __STRICT_ANSI__
|
|
#include "libc/bits/safemacros.h"
|
|
#include "libc/elf/def.h"
|
|
#include "libc/elf/struct/ehdr.h"
|
|
#include "libc/elf/struct/phdr.h"
|
|
#include "libc/elf/struct/shdr.h"
|
|
#include "libc/elf/struct/sym.h"
|
|
#include "libc/limits.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/str/str.h"
|
|
#if !(__ASSEMBLER__ + __LINKER__ + 0)
|
|
COSMOPOLITAN_C_START_
|
|
|
|
/*───────────────────────────────────────────────────────────────────────────│─╗
|
|
│ cosmopolitan § executable & linkable format ─╬─│┼
|
|
╚────────────────────────────────────────────────────────────────────────────│*/
|
|
|
|
struct MappedFile;
|
|
|
|
Elf64_Ehdr *mapelfread(const char *, struct MappedFile *);
|
|
char *GetElfStringTable(const Elf64_Ehdr *, size_t);
|
|
Elf64_Sym *GetElfSymbolTable(const Elf64_Ehdr *, size_t, Elf64_Xword *);
|
|
bool IsElf64Binary(const Elf64_Ehdr *, size_t);
|
|
|
|
forceinline void checkelfaddress(const Elf64_Ehdr *elf, size_t mapsize,
|
|
intptr_t addr, size_t addrsize) {
|
|
#if !(TRUSTWORTHY + ELF_TRUSTWORTHY + 0) || ELF_UNTRUSTWORTHY + 0
|
|
if (addr < (intptr_t)elf || addr + addrsize > (intptr_t)elf + mapsize) {
|
|
abort();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static inline bool iselfsymbolcontent(const Elf64_Sym *sym) {
|
|
return sym->st_size > 0 && (ELF64_ST_TYPE(sym->st_info) == STT_FUNC ||
|
|
ELF64_ST_TYPE(sym->st_info) == STT_OBJECT);
|
|
}
|
|
|
|
static inline Elf64_Phdr *getelfsegmentheaderaddress(const Elf64_Ehdr *elf,
|
|
size_t mapsize,
|
|
unsigned i) {
|
|
intptr_t addr =
|
|
((intptr_t)elf + (intptr_t)elf->e_phoff + (intptr_t)elf->e_phentsize * i);
|
|
checkelfaddress(elf, mapsize, addr, elf->e_phentsize);
|
|
return (Elf64_Phdr *)addr;
|
|
}
|
|
|
|
static inline Elf64_Shdr *getelfsectionheaderaddress(const Elf64_Ehdr *elf,
|
|
size_t mapsize,
|
|
Elf64_Half i) {
|
|
intptr_t addr =
|
|
((intptr_t)elf + (intptr_t)elf->e_shoff + (intptr_t)elf->e_shentsize * i);
|
|
checkelfaddress(elf, mapsize, addr, elf->e_shentsize);
|
|
return (Elf64_Shdr *)addr;
|
|
}
|
|
|
|
static inline void *getelfsectionaddress(const Elf64_Ehdr *elf, size_t mapsize,
|
|
const Elf64_Shdr *shdr) {
|
|
intptr_t addr, size;
|
|
addr = (intptr_t)elf + (intptr_t)shdr->sh_offset;
|
|
size = (intptr_t)shdr->sh_size;
|
|
checkelfaddress(elf, mapsize, addr, size);
|
|
return (void *)addr;
|
|
}
|
|
|
|
static inline char *getelfsectionnamestringtable(const Elf64_Ehdr *elf,
|
|
size_t mapsize) {
|
|
if (!elf->e_shoff || !elf->e_shentsize) return NULL;
|
|
return getelfsectionaddress(
|
|
elf, mapsize, getelfsectionheaderaddress(elf, mapsize, elf->e_shstrndx));
|
|
}
|
|
|
|
static inline void getelfvirtualaddressrange(const Elf64_Ehdr *elf,
|
|
size_t elfsize,
|
|
intptr_t *out_start,
|
|
intptr_t *out_end) {
|
|
unsigned i;
|
|
Elf64_Phdr *phdr;
|
|
intptr_t start, end, pstart, pend;
|
|
start = INTPTR_MAX;
|
|
end = 0;
|
|
for (i = 0; i < elf->e_phnum; ++i) {
|
|
phdr = getelfsegmentheaderaddress(elf, elfsize, i);
|
|
if (phdr->p_type != PT_LOAD) continue;
|
|
pstart = phdr->p_vaddr;
|
|
pend = phdr->p_vaddr + phdr->p_memsz;
|
|
if (pstart < start) start = pstart;
|
|
if (pend > end) end = pend;
|
|
}
|
|
if (out_start) *out_start = start;
|
|
if (out_end) *out_end = end;
|
|
}
|
|
|
|
static inline char *GetElfString(const Elf64_Ehdr *elf, size_t mapsize,
|
|
const char *strtab, Elf64_Word rva) {
|
|
intptr_t addr = (intptr_t)strtab + rva;
|
|
#if !(TRUSTWORTHY + ELF_TRUSTWORTHY + 0)
|
|
checkelfaddress(elf, mapsize, addr, 0);
|
|
checkelfaddress(elf, mapsize, addr,
|
|
strnlen((char *)addr, (intptr_t)elf + mapsize - addr) + 1);
|
|
#endif
|
|
return (char *)addr;
|
|
}
|
|
|
|
static inline const char *GetElfSectionName(const Elf64_Ehdr *elf,
|
|
size_t mapsize, Elf64_Shdr *shdr) {
|
|
if (!elf || !shdr) return NULL;
|
|
return GetElfString(elf, mapsize, getelfsectionnamestringtable(elf, mapsize),
|
|
shdr->sh_name);
|
|
}
|
|
|
|
COSMOPOLITAN_C_END_
|
|
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
|
|
#endif /* !ANSI */
|
|
#endif /* COSMOPOLITAN_LIBC_ELF_H_ */
|
|
|