1 #include <elf.h>
2 #include <link.h>
3 #include "pthread_impl.h"
4 #include "libc.h"
5
6 #define AUX_CNT 38
7
8 extern weak hidden const size_t _DYNAMIC[];
9
static_dl_iterate_phdr(int (* callback)(struct dl_phdr_info * info,size_t size,void * data),void * data)10 static int static_dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data)
11 {
12 unsigned char *p;
13 ElfW(Phdr) *phdr, *tls_phdr=0;
14 size_t base = 0;
15 size_t n;
16 struct dl_phdr_info info;
17 size_t i, aux[AUX_CNT] = {0};
18
19 for (i=0; libc.auxv[i]; i+=2)
20 if (libc.auxv[i]<AUX_CNT) aux[libc.auxv[i]] = libc.auxv[i+1];
21
22 for (p=(void *)aux[AT_PHDR],n=aux[AT_PHNUM]; n; n--,p+=aux[AT_PHENT]) {
23 phdr = (void *)p;
24 if (phdr->p_type == PT_PHDR)
25 base = aux[AT_PHDR] - phdr->p_vaddr;
26 if (phdr->p_type == PT_DYNAMIC && _DYNAMIC)
27 base = (size_t)_DYNAMIC - phdr->p_vaddr;
28 if (phdr->p_type == PT_TLS)
29 tls_phdr = phdr;
30 }
31 info.dlpi_addr = base;
32 info.dlpi_name = "/proc/self/exe";
33 info.dlpi_phdr = (void *)aux[AT_PHDR];
34 info.dlpi_phnum = aux[AT_PHNUM];
35 info.dlpi_adds = 0;
36 info.dlpi_subs = 0;
37 if (tls_phdr) {
38 info.dlpi_tls_modid = 1;
39 info.dlpi_tls_data = __tls_get_addr((tls_mod_off_t[]){1,0});
40 } else {
41 info.dlpi_tls_modid = 0;
42 info.dlpi_tls_data = 0;
43 }
44 return (callback)(&info, sizeof (info), data);
45 }
46
47 weak_alias(static_dl_iterate_phdr, dl_iterate_phdr);
48