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add dl_iterate_phdr interface

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patches by Alex Caudill (npx). the dynamic-linked version is almost
identical to the final submitted patch; I just added a couple missing
lines for saving the phdr address when the dynamic linker is invoked
directly to run a program, and removed a couple to avoid introducing
another unnecessary type. the static-linked version is based on npx's
draft. it could use some improvements which are contingent on the
startup code saving some additional information for later use.
This commit is contained in:
Rich Felker
2012-10-31 21:27:48 -04:00
parent 76f28cfce5
commit 18c0e02e2b
3 changed files with 114 additions and 7 deletions
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27
include/link.h Normal file
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#ifndef _LINK_H
#define _LINK_H
#include <elf.h>
#define __NEED_size_t
#include <bits/alltypes.h>
#if UINTPTR_MAX > 0xffffffff
#define ElfW(type) Elf64_ ## type
#else
#define ElfW(type) Elf32_ ## type
#endif
struct dl_phdr_info {
ElfW(Addr) dlpi_addr;
const char *dlpi_name;
const ElfW(Phdr) *dlpi_phdr;
ElfW(Half) dlpi_phnum;
unsigned long long int dlpi_adds;
unsigned long long int dlpi_subs;
size_t dlpi_tls_modid;
void *dlpi_tls_data;
};
int dl_iterate_phdr(int (*)(struct dl_phdr_info *, size_t, void *), void *);
#endif