+#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int refcnt;
Sym *syms;
uint32_t *hashtab;
+ uint32_t *ghashtab;
char *strings;
unsigned char *map;
size_t map_len;
static jmp_buf rtld_fail;
static pthread_rwlock_t lock;
static struct debug debug;
+static size_t *auxv;
struct debug *_dl_debug_addr = &debug;
}
}
-static uint32_t hash(const char *s0)
+static int search_vec(size_t *v, size_t *r, size_t key)
+{
+ for (; v[0]!=key; v+=2)
+ if (!v[0]) return 0;
+ *r = v[1];
+ return 1;
+}
+
+static uint32_t sysv_hash(const char *s0)
{
const unsigned char *s = (void *)s0;
uint_fast32_t h = 0;
return h & 0xfffffff;
}
-static Sym *lookup(const char *s, uint32_t h, struct dso *dso)
+static uint32_t gnu_hash(const char *s0)
+{
+ const unsigned char *s = (void *)s0;
+ uint_fast32_t h = 5381;
+ for (; *s; s++)
+ h = h*33 + *s;
+ return h;
+}
+
+static Sym *sysv_lookup(const char *s, uint32_t h, struct dso *dso)
{
size_t i;
Sym *syms = dso->syms;
return 0;
}
+static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso)
+{
+ Sym *sym;
+ char *strings;
+ uint32_t *hashtab = dso->ghashtab;
+ uint32_t nbuckets = hashtab[0];
+ uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4);
+ uint32_t h2;
+ uint32_t *hashval;
+ uint32_t n = buckets[h1 % nbuckets];
+
+ if (!n) return 0;
+
+ strings = dso->strings;
+ sym = dso->syms + n;
+ hashval = buckets + nbuckets + (n - hashtab[1]);
+
+ for (h1 |= 1; ; sym++) {
+ h2 = *hashval++;
+ if ((h1 == (h2|1)) && !strcmp(s, strings + sym->st_name))
+ return sym;
+ if (h2 & 1) break;
+ }
+
+ return 0;
+}
+
#define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON)
#define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK)
static void *find_sym(struct dso *dso, const char *s, int need_def)
{
- uint32_t h = hash(s);
+ uint32_t h = 0, gh = 0;
void *def = 0;
- if (h==0x6b366be && !strcmp(s, "dlopen")) rtld_used = 1;
- if (h==0x6b3afd && !strcmp(s, "dlsym")) rtld_used = 1;
- if (h==0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
+ if (dso->ghashtab) {
+ gh = gnu_hash(s);
+ if (gh == 0xf9040207 && !strcmp(s, "dlopen")) rtld_used = 1;
+ if (gh == 0xf4dc4ae && !strcmp(s, "dlsym")) rtld_used = 1;
+ if (gh == 0x1f4039c9 && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
+ } else {
+ h = sysv_hash(s);
+ if (h == 0x6b366be && !strcmp(s, "dlopen")) rtld_used = 1;
+ if (h == 0x6b3afd && !strcmp(s, "dlsym")) rtld_used = 1;
+ if (h == 0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
+ }
for (; dso; dso=dso->next) {
Sym *sym;
if (!dso->global) continue;
- sym = lookup(s, h, dso);
+ if (dso->ghashtab) {
+ if (!gh) gh = gnu_hash(s);
+ sym = gnu_lookup(s, gh, dso);
+ } else {
+ if (!h) h = sysv_hash(s);
+ sym = sysv_lookup(s, h, dso);
+ }
if (sym && (!need_def || sym->st_shndx) && sym->st_value
&& (1<<(sym->st_info&0xf) & OK_TYPES)
&& (1<<(sym->st_info>>4) & OK_BINDS)) {
size_t dyn[DYN_CNT] = {0};
decode_vec(p->dynv, dyn, DYN_CNT);
p->syms = (void *)(p->base + dyn[DT_SYMTAB]);
- p->hashtab = (void *)(p->base + dyn[DT_HASH]);
p->strings = (void *)(p->base + dyn[DT_STRTAB]);
+ if (dyn[0]&(1<<DT_HASH))
+ p->hashtab = (void *)(p->base + dyn[DT_HASH]);
+ if (search_vec(p->dynv, dyn, DT_GNU_HASH))
+ p->ghashtab = (void *)(p->base + *dyn);
}
static struct dso *load_library(const char *name)
return 0;
}
+static void find_map_range(Phdr *ph, size_t cnt, size_t stride, struct dso *p)
+{
+ size_t min_addr = -1, max_addr = 0;
+ for (; cnt--; ph = (void *)((char *)ph + stride)) {
+ if (ph->p_type != PT_LOAD) continue;
+ if (ph->p_vaddr < min_addr)
+ min_addr = ph->p_vaddr;
+ if (ph->p_vaddr+ph->p_memsz > max_addr)
+ max_addr = ph->p_vaddr+ph->p_memsz;
+ }
+ min_addr &= -PAGE_SIZE;
+ max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE;
+ p->map = p->base + min_addr;
+ p->map_len = max_addr - min_addr;
+}
+
static void do_init_fini(struct dso *p)
{
size_t dyn[DYN_CNT] = {0};
void *__dynlink(int argc, char **argv)
{
- size_t *auxv, aux[AUX_CNT] = {0};
+ size_t aux[AUX_CNT] = {0};
size_t i;
Phdr *phdr;
Ehdr *ehdr;
struct dso *const lib = builtin_dsos+1;
struct dso *const vdso = builtin_dsos+2;
char *env_preload=0;
+ size_t vdso_base;
/* Find aux vector just past environ[] */
for (i=argc+1; argv[i]; i++)
lib->name = lib->shortname = "libc.so";
lib->global = 1;
ehdr = (void *)lib->base;
+ find_map_range((void *)(aux[AT_BASE]+ehdr->e_phoff),
+ ehdr->e_phnum, ehdr->e_phentsize, lib);
lib->dynv = (void *)(lib->base + find_dyn(
(void *)(aux[AT_BASE]+ehdr->e_phoff),
ehdr->e_phnum, ehdr->e_phentsize));
app->name = argv[0];
app->dynv = (void *)(app->base + find_dyn(
(void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT]));
+ find_map_range((void *)aux[AT_PHDR],
+ aux[AT_PHNUM], aux[AT_PHENT], app);
} else {
int fd;
char *ldname = argv[0];
decode_dyn(app);
/* Attach to vdso, if provided by the kernel */
- for (i=0; auxv[i]; i+=2) {
- size_t vdso_base = auxv[i+1];
- if (auxv[i] != AT_SYSINFO_EHDR) continue;
+ if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) {
ehdr = (void *)vdso_base;
phdr = (void *)(vdso_base + ehdr->e_phoff);
for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) {
decode_dyn(vdso);
vdso->prev = lib;
lib->next = vdso;
- break;
}
/* Initial dso chain consists only of the app. We temporarily
p->global = 1;
}
+ if (ssp_used) __init_ssp(auxv);
+
_dl_debug_state();
do_init_fini(tail);
static void *do_dlsym(struct dso *p, const char *s, void *ra)
{
size_t i;
- uint32_t h;
+ uint32_t h = 0, gh = 0;
Sym *sym;
if (p == RTLD_NEXT) {
for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next);
if (!res) goto failed;
return res;
}
- h = hash(s);
- sym = lookup(s, h, p);
+ if (p->ghashtab) {
+ gh = gnu_hash(s);
+ sym = gnu_lookup(s, gh, p);
+ } else {
+ h = sysv_hash(s);
+ sym = sysv_lookup(s, h, p);
+ }
if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
return p->base + sym->st_value;
if (p->deps) for (i=0; p->deps[i]; i++) {
- sym = lookup(s, h, p->deps[i]);
+ if (p->deps[i]->ghashtab) {
+ if (!gh) gh = gnu_hash(s);
+ sym = gnu_lookup(s, gh, p->deps[i]);
+ } else {
+ if (!h) h = sysv_hash(s);
+ sym = sysv_lookup(s, h, p->deps[i]);
+ }
if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
return p->deps[i]->base + sym->st_value;
}
return 0;
}
+int __dladdr(void *addr, Dl_info *info)
+{
+ struct dso *p;
+ Sym *sym;
+ uint32_t nsym;
+ char *strings;
+ size_t i;
+ void *best = 0;
+ char *bestname;
+
+ pthread_rwlock_rdlock(&lock);
+ for (p=head; p && (unsigned char *)addr-p->map>p->map_len; p=p->next);
+ pthread_rwlock_unlock(&lock);
+
+ if (!p) return 0;
+
+ sym = p->syms;
+ strings = p->strings;
+ if (p->hashtab) {
+ nsym = p->hashtab[1];
+ } else {
+ uint32_t *buckets;
+ uint32_t *hashval;
+ buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4);
+ sym += p->ghashtab[1];
+ for (i = 0; i < p->ghashtab[0]; i++) {
+ if (buckets[i] > nsym)
+ nsym = buckets[i];
+ }
+ if (nsym) {
+ nsym -= p->ghashtab[1];
+ hashval = buckets + p->ghashtab[0] + nsym;
+ do nsym++;
+ while (!(*hashval++ & 1));
+ }
+ }
+
+ for (; nsym; nsym--, sym++) {
+ if (sym->st_shndx && sym->st_value
+ && (1<<(sym->st_info&0xf) & OK_TYPES)
+ && (1<<(sym->st_info>>4) & OK_BINDS)) {
+ void *symaddr = p->base + sym->st_value;
+ if (symaddr > addr || symaddr < best)
+ continue;
+ best = symaddr;
+ bestname = strings + sym->st_name;
+ if (addr == symaddr)
+ break;
+ }
+ }
+
+ if (!best) return 0;
+
+ info->dli_fname = p->name;
+ info->dli_fbase = p->base;
+ info->dli_sname = bestname;
+ info->dli_saddr = best;
+
+ return 1;
+}
+
void *__dlsym(void *p, const char *s, void *ra)
{
void *res;
{
return 0;
}
+int __dladdr (void *addr, Dl_info *info)
+{
+ return 0;
+}
#endif
char *dlerror()
projects / musl / blobdiff