diff options
Diffstat (limited to 'src/ldso/dynlink.c')
| -rw-r--r-- | src/ldso/dynlink.c | 41 |
1 files changed, 22 insertions, 19 deletions
diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c index 70b2ae13..75fae762 100644 --- a/src/ldso/dynlink.c +++ b/src/ldso/dynlink.c @@ -122,6 +122,9 @@ static int dl_strcmp(const char *l, const char *r) } #define strcmp(l,r) dl_strcmp(l,r) +/* Compute load address for a virtual address in a given dso. */ +#define laddr(p, v) (void *)((p)->base + (v)) + static void decode_vec(size_t *v, size_t *a, size_t cnt) { size_t i; @@ -414,8 +417,8 @@ static void reclaim(struct dso *dso, size_t start, size_t end) start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t); end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t); if (start>end || end-start < 4*sizeof(size_t)) return; - a = (size_t *)(dso->base + start); - z = (size_t *)(dso->base + end); + a = laddr(dso, start); + z = laddr(dso, end); a[-2] = 1; a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1; z[1] = 1; @@ -687,18 +690,18 @@ static void decode_dyn(struct dso *p) { size_t dyn[DYN_CNT]; decode_vec(p->dynv, dyn, DYN_CNT); - p->syms = (void *)(p->base + dyn[DT_SYMTAB]); - p->strings = (void *)(p->base + dyn[DT_STRTAB]); + p->syms = laddr(p, dyn[DT_SYMTAB]); + p->strings = laddr(p, dyn[DT_STRTAB]); if (dyn[0]&(1<<DT_HASH)) - p->hashtab = (void *)(p->base + dyn[DT_HASH]); + p->hashtab = laddr(p, dyn[DT_HASH]); if (dyn[0]&(1<<DT_RPATH)) p->rpath_orig = (void *)(p->strings + dyn[DT_RPATH]); if (dyn[0]&(1<<DT_RUNPATH)) p->rpath_orig = (void *)(p->strings + dyn[DT_RUNPATH]); if (search_vec(p->dynv, dyn, DT_GNU_HASH)) - p->ghashtab = (void *)(p->base + *dyn); + p->ghashtab = laddr(p, *dyn); if (search_vec(p->dynv, dyn, DT_VERSYM)) - p->versym = (void *)(p->base + *dyn); + p->versym = laddr(p, *dyn); } static struct dso *load_library(const char *name, struct dso *needed_by) @@ -980,7 +983,7 @@ static void kernel_mapped_dso(struct dso *p) Phdr *ph = p->phdr; for (cnt = p->phnum; cnt--; ph = (void *)((char *)ph + p->phentsize)) { if (ph->p_type == PT_DYNAMIC) { - p->dynv = (void *)(p->base + ph->p_vaddr); + p->dynv = laddr(p, ph->p_vaddr); } else if (ph->p_type == PT_GNU_RELRO) { p->relro_start = ph->p_vaddr & -PAGE_SIZE; p->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE; @@ -1007,12 +1010,12 @@ static void do_fini() decode_vec(p->dynv, dyn, DYN_CNT); if (dyn[0] & (1<<DT_FINI_ARRAY)) { size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t); - size_t *fn = (size_t *)(p->base + dyn[DT_FINI_ARRAY])+n; + size_t *fn = (size_t *)laddr(p, dyn[DT_FINI_ARRAY])+n; while (n--) ((void (*)(void))*--fn)(); } #ifndef NO_LEGACY_INITFINI if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI]) - ((void (*)(void))(p->base + dyn[DT_FINI]))(); + ((void (*)(void))laddr(p, dyn[DT_FINI]))(); #endif } } @@ -1035,11 +1038,11 @@ static void do_init_fini(struct dso *p) } #ifndef NO_LEGACY_INITFINI if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT]) - ((void (*)(void))(p->base + dyn[DT_INIT]))(); + ((void (*)(void))laddr(p, dyn[DT_INIT]))(); #endif if (dyn[0] & (1<<DT_INIT_ARRAY)) { size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t); - size_t *fn = (void *)(p->base + dyn[DT_INIT_ARRAY]); + size_t *fn = laddr(p, dyn[DT_INIT_ARRAY]); while (n--) ((void (*)(void))*fn++)(); } if (!need_locking && libc.threads_minus_1) { @@ -1276,8 +1279,8 @@ _Noreturn void __dls3(size_t *sp) app.tls_align = phdr->p_align; } } - if (app.tls_size) app.tls_image = (char *)app.base + tls_image; - if (interp_off) ldso.name = (char *)app.base + interp_off; + if (app.tls_size) app.tls_image = laddr(&app, tls_image); + if (interp_off) ldso.name = laddr(&app, interp_off); if ((aux[0] & (1UL<<AT_EXECFN)) && strncmp((char *)aux[AT_EXECFN], "/proc/", 6)) app.name = (char *)aux[AT_EXECFN]; @@ -1334,7 +1337,7 @@ _Noreturn void __dls3(size_t *sp) close(fd); ldso.name = ldname; app.name = argv[0]; - aux[AT_ENTRY] = (size_t)app.base + ehdr->e_entry; + aux[AT_ENTRY] = (size_t)laddr(&app, ehdr->e_entry); /* Find the name that would have been used for the dynamic * linker had ldd not taken its place. */ if (ldd_mode) { @@ -1571,7 +1574,7 @@ static void *do_dlsym(struct dso *p, const char *s, void *ra) if (!def.sym) goto failed; if ((def.sym->st_info&0xf) == STT_TLS) return __tls_get_addr((size_t []){def.dso->tls_id, def.sym->st_value}); - return def.dso->base + def.sym->st_value; + return laddr(def.dso, def.sym->st_value); } if (invalid_dso_handle(p)) return 0; @@ -1585,7 +1588,7 @@ static void *do_dlsym(struct dso *p, const char *s, void *ra) if (sym && (sym->st_info&0xf) == STT_TLS) return __tls_get_addr((size_t []){p->tls_id, sym->st_value}); if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) - return p->base + sym->st_value; + return laddr(p, sym->st_value); if (p->deps) for (i=0; p->deps[i]; i++) { if ((ght = p->deps[i]->ghashtab)) { if (!gh) gh = gnu_hash(s); @@ -1597,7 +1600,7 @@ static void *do_dlsym(struct dso *p, const char *s, void *ra) if (sym && (sym->st_info&0xf) == STT_TLS) return __tls_get_addr((size_t []){p->deps[i]->tls_id, sym->st_value}); if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) - return p->deps[i]->base + sym->st_value; + return laddr(p->deps[i], sym->st_value); } failed: error("Symbol not found: %s", s); @@ -1645,7 +1648,7 @@ int __dladdr(const void *addr, Dl_info *info) if (sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES) && (1<<(sym->st_info>>4) & OK_BINDS)) { - void *symaddr = p->base + sym->st_value; + void *symaddr = laddr(p, sym->st_value); if (symaddr > addr || symaddr < best) continue; best = symaddr; |