diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/ldso/dlstart.c | 150 | ||||
| -rw-r--r-- | src/ldso/dynlink.c | 1933 | ||||
| -rw-r--r-- | src/ldso/tlsdesc.c | 4 |
3 files changed, 0 insertions, 2087 deletions
diff --git a/src/ldso/dlstart.c b/src/ldso/dlstart.c deleted file mode 100644 index 46f50114..00000000 --- a/src/ldso/dlstart.c +++ /dev/null @@ -1,150 +0,0 @@ -#include <stddef.h> -#include "dynlink.h" - -#ifdef SHARED - -#ifndef START -#define START "_dlstart" -#endif - -#include "crt_arch.h" - -#ifndef GETFUNCSYM -#define GETFUNCSYM(fp, sym, got) do { \ - __attribute__((__visibility__("hidden"))) void sym(); \ - static void (*static_func_ptr)() = sym; \ - __asm__ __volatile__ ( "" : "+m"(static_func_ptr) : : "memory"); \ - *(fp) = static_func_ptr; } while(0) -#endif - -__attribute__((__visibility__("hidden"))) -void _dlstart_c(size_t *sp, size_t *dynv) -{ - size_t i, aux[AUX_CNT], dyn[DYN_CNT]; - size_t *rel, rel_size, base; - - int argc = *sp; - char **argv = (void *)(sp+1); - - for (i=argc+1; argv[i]; i++); - size_t *auxv = (void *)(argv+i+1); - - for (i=0; i<AUX_CNT; i++) aux[i] = 0; - for (i=0; auxv[i]; i+=2) if (auxv[i]<AUX_CNT) - aux[auxv[i]] = auxv[i+1]; - -#if DL_FDPIC - struct fdpic_loadseg *segs, fakeseg; - size_t j; - if (dynv) { - /* crt_arch.h entry point asm is responsible for reserving - * space and moving the extra fdpic arguments to the stack - * vector where they are easily accessible from C. */ - segs = ((struct fdpic_loadmap *)(sp[-1] ? sp[-1] : sp[-2]))->segs; - } else { - /* If dynv is null, the entry point was started from loader - * that is not fdpic-aware. We can assume normal fixed- - * displacement ELF loading was performed, but when ldso was - * run as a command, finding the Ehdr is a heursitic: we - * have to assume Phdrs start in the first 4k of the file. */ - base = aux[AT_BASE]; - if (!base) base = aux[AT_PHDR] & -4096; - segs = &fakeseg; - segs[0].addr = base; - segs[0].p_vaddr = 0; - segs[0].p_memsz = -1; - Ehdr *eh = (void *)base; - Phdr *ph = (void *)(base + eh->e_phoff); - size_t phnum = eh->e_phnum; - size_t phent = eh->e_phentsize; - while (phnum-- && ph->p_type != PT_DYNAMIC) - ph = (void *)((size_t)ph + phent); - dynv = (void *)(base + ph->p_vaddr); - } -#endif - - for (i=0; i<DYN_CNT; i++) dyn[i] = 0; - for (i=0; dynv[i]; i+=2) if (dynv[i]<DYN_CNT) - dyn[dynv[i]] = dynv[i+1]; - -#if DL_FDPIC - for (i=0; i<DYN_CNT; i++) { - if (i==DT_RELASZ || i==DT_RELSZ) continue; - if (!dyn[i]) continue; - for (j=0; dyn[i]-segs[j].p_vaddr >= segs[j].p_memsz; j++); - dyn[i] += segs[j].addr - segs[j].p_vaddr; - } - base = 0; - - const Sym *syms = (void *)dyn[DT_SYMTAB]; - - rel = (void *)dyn[DT_RELA]; - rel_size = dyn[DT_RELASZ]; - for (; rel_size; rel+=3, rel_size-=3*sizeof(size_t)) { - if (!IS_RELATIVE(rel[1], syms)) continue; - for (j=0; rel[0]-segs[j].p_vaddr >= segs[j].p_memsz; j++); - size_t *rel_addr = (void *) - (rel[0] + segs[j].addr - segs[j].p_vaddr); - if (R_TYPE(rel[1]) == REL_FUNCDESC_VAL) { - *rel_addr += segs[rel_addr[1]].addr - - segs[rel_addr[1]].p_vaddr - + syms[R_SYM(rel[1])].st_value; - rel_addr[1] = dyn[DT_PLTGOT]; - } else { - size_t val = syms[R_SYM(rel[1])].st_value; - for (j=0; val-segs[j].p_vaddr >= segs[j].p_memsz; j++); - *rel_addr = rel[2] + segs[j].addr - segs[j].p_vaddr + val; - } - } -#else - /* If the dynamic linker is invoked as a command, its load - * address is not available in the aux vector. Instead, compute - * the load address as the difference between &_DYNAMIC and the - * virtual address in the PT_DYNAMIC program header. */ - base = aux[AT_BASE]; - if (!base) { - size_t phnum = aux[AT_PHNUM]; - size_t phentsize = aux[AT_PHENT]; - Phdr *ph = (void *)aux[AT_PHDR]; - for (i=phnum; i--; ph = (void *)((char *)ph + phentsize)) { - if (ph->p_type == PT_DYNAMIC) { - base = (size_t)dynv - ph->p_vaddr; - break; - } - } - } - - /* MIPS uses an ugly packed form for GOT relocations. Since we - * can't make function calls yet and the code is tiny anyway, - * it's simply inlined here. */ - if (NEED_MIPS_GOT_RELOCS) { - size_t local_cnt = 0; - size_t *got = (void *)(base + dyn[DT_PLTGOT]); - for (i=0; dynv[i]; i+=2) if (dynv[i]==DT_MIPS_LOCAL_GOTNO) - local_cnt = dynv[i+1]; - for (i=0; i<local_cnt; i++) got[i] += base; - } - - rel = (void *)(base+dyn[DT_REL]); - rel_size = dyn[DT_RELSZ]; - for (; rel_size; rel+=2, rel_size-=2*sizeof(size_t)) { - if (!IS_RELATIVE(rel[1], 0)) continue; - size_t *rel_addr = (void *)(base + rel[0]); - *rel_addr += base; - } - - rel = (void *)(base+dyn[DT_RELA]); - rel_size = dyn[DT_RELASZ]; - for (; rel_size; rel+=3, rel_size-=3*sizeof(size_t)) { - if (!IS_RELATIVE(rel[1], 0)) continue; - size_t *rel_addr = (void *)(base + rel[0]); - *rel_addr = base + rel[2]; - } -#endif - - stage2_func dls2; - GETFUNCSYM(&dls2, __dls2, base+dyn[DT_PLTGOT]); - dls2((void *)base, sp); -} - -#endif diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c deleted file mode 100644 index e328679b..00000000 --- a/src/ldso/dynlink.c +++ /dev/null @@ -1,1933 +0,0 @@ -#ifdef SHARED -#define _GNU_SOURCE -#include <stdio.h> -#include <stdlib.h> -#include <stdarg.h> -#include <stddef.h> -#include <string.h> -#include <unistd.h> -#include <stdint.h> -#include <elf.h> -#include <sys/mman.h> -#include <limits.h> -#include <fcntl.h> -#include <sys/stat.h> -#include <errno.h> -#include <link.h> -#include <setjmp.h> -#include <pthread.h> -#include <ctype.h> -#include <dlfcn.h> -#include "pthread_impl.h" -#include "libc.h" -#include "dynlink.h" - -static void error(const char *, ...); - -#define MAXP2(a,b) (-(-(a)&-(b))) -#define ALIGN(x,y) ((x)+(y)-1 & -(y)) - -struct debug { - int ver; - void *head; - void (*bp)(void); - int state; - void *base; -}; - -struct td_index { - size_t args[2]; - struct td_index *next; -}; - -struct dso { -#if DL_FDPIC - struct fdpic_loadmap *loadmap; -#else - unsigned char *base; -#endif - char *name; - size_t *dynv; - struct dso *next, *prev; - - Phdr *phdr; - int phnum; - size_t phentsize; - int refcnt; - Sym *syms; - uint32_t *hashtab; - uint32_t *ghashtab; - int16_t *versym; - char *strings; - unsigned char *map; - size_t map_len; - dev_t dev; - ino_t ino; - signed char global; - char relocated; - char constructed; - char kernel_mapped; - struct dso **deps, *needed_by; - char *rpath_orig, *rpath; - struct tls_module tls; - size_t tls_id; - size_t relro_start, relro_end; - void **new_dtv; - unsigned char *new_tls; - volatile int new_dtv_idx, new_tls_idx; - struct td_index *td_index; - struct dso *fini_next; - char *shortname; -#if DL_FDPIC - unsigned char *base; -#else - struct fdpic_loadmap *loadmap; -#endif - struct funcdesc { - void *addr; - size_t *got; - } *funcdescs; - size_t *got; - char buf[]; -}; - -struct symdef { - Sym *sym; - struct dso *dso; -}; - -int __init_tp(void *); -void __init_libc(char **, char *); -void *__copy_tls(unsigned char *); - -__attribute__((__visibility__("hidden"))) -const char *__libc_get_version(void); - -static struct builtin_tls { - char c; - struct pthread pt; - void *space[16]; -} builtin_tls[1]; -#define MIN_TLS_ALIGN offsetof(struct builtin_tls, pt) - -#define ADDEND_LIMIT 4096 -static size_t *saved_addends, *apply_addends_to; - -static struct dso ldso; -static struct dso *head, *tail, *fini_head; -static char *env_path, *sys_path; -static unsigned long long gencnt; -static int runtime; -static int ldd_mode; -static int ldso_fail; -static int noload; -static jmp_buf *rtld_fail; -static pthread_rwlock_t lock; -static struct debug debug; -static struct tls_module *tls_tail; -static size_t tls_cnt, tls_offset, tls_align = MIN_TLS_ALIGN; -static size_t static_tls_cnt; -static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE }; -static struct fdpic_loadmap *app_loadmap; -static struct fdpic_dummy_loadmap app_dummy_loadmap; - -struct debug *_dl_debug_addr = &debug; - -__attribute__((__visibility__("hidden"))) -void (*const __init_array_start)(void)=0, (*const __fini_array_start)(void)=0; - -__attribute__((__visibility__("hidden"))) -extern void (*const __init_array_end)(void), (*const __fini_array_end)(void); - -weak_alias(__init_array_start, __init_array_end); -weak_alias(__fini_array_start, __fini_array_end); - -static int dl_strcmp(const char *l, const char *r) -{ - for (; *l==*r && *l; l++, r++); - return *(unsigned char *)l - *(unsigned char *)r; -} -#define strcmp(l,r) dl_strcmp(l,r) - -/* Compute load address for a virtual address in a given dso. */ -#if DL_FDPIC -static void *laddr(const struct dso *p, size_t v) -{ - size_t j=0; - if (!p->loadmap) return p->base + v; - for (j=0; v-p->loadmap->segs[j].p_vaddr >= p->loadmap->segs[j].p_memsz; j++); - return (void *)(v - p->loadmap->segs[j].p_vaddr + p->loadmap->segs[j].addr); -} -#define fpaddr(p, v) ((void (*)())&(struct funcdesc){ \ - laddr(p, v), (p)->got }) -#else -#define laddr(p, v) (void *)((p)->base + (v)) -#define fpaddr(p, v) ((void (*)())laddr(p, v)) -#endif - -static void decode_vec(size_t *v, size_t *a, size_t cnt) -{ - size_t i; - for (i=0; i<cnt; i++) a[i] = 0; - for (; v[0]; v+=2) if (v[0]-1<cnt-1) { - a[0] |= 1UL<<v[0]; - a[v[0]] = v[1]; - } -} - -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; - while (*s) { - h = 16*h + *s++; - h ^= h>>24 & 0xf0; - } - return h & 0xfffffff; -} - -static uint32_t gnu_hash(const char *s0) -{ - const unsigned char *s = (void *)s0; - uint_fast32_t h = 5381; - for (; *s; s++) - h += h*32 + *s; - return h; -} - -static Sym *sysv_lookup(const char *s, uint32_t h, struct dso *dso) -{ - size_t i; - Sym *syms = dso->syms; - uint32_t *hashtab = dso->hashtab; - char *strings = dso->strings; - for (i=hashtab[2+h%hashtab[0]]; i; i=hashtab[2+hashtab[0]+i]) { - if ((!dso->versym || dso->versym[i] >= 0) - && (!strcmp(s, strings+syms[i].st_name))) - return syms+i; - } - return 0; -} - -static Sym *gnu_lookup(uint32_t h1, uint32_t *hashtab, struct dso *dso, const char *s) -{ - uint32_t nbuckets = hashtab[0]; - uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4); - uint32_t i = buckets[h1 % nbuckets]; - - if (!i) return 0; - - uint32_t *hashval = buckets + nbuckets + (i - hashtab[1]); - - for (h1 |= 1; ; i++) { - uint32_t h2 = *hashval++; - if ((h1 == (h2|1)) && (!dso->versym || dso->versym[i] >= 0) - && !strcmp(s, dso->strings + dso->syms[i].st_name)) - return dso->syms+i; - if (h2 & 1) break; - } - - return 0; -} - -static Sym *gnu_lookup_filtered(uint32_t h1, uint32_t *hashtab, struct dso *dso, const char *s, uint32_t fofs, size_t fmask) -{ - const size_t *bloomwords = (const void *)(hashtab+4); - size_t f = bloomwords[fofs & (hashtab[2]-1)]; - if (!(f & fmask)) return 0; - - f >>= (h1 >> hashtab[3]) % (8 * sizeof f); - if (!(f & 1)) return 0; - - return gnu_lookup(h1, hashtab, dso, s); -} - -#define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON | 1<<STT_TLS) -#define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK | 1<<STB_GNU_UNIQUE) - -#ifndef ARCH_SYM_REJECT_UND -#define ARCH_SYM_REJECT_UND(s) 0 -#endif - -static struct symdef find_sym(struct dso *dso, const char *s, int need_def) -{ - uint32_t h = 0, gh, gho, *ght; - size_t ghm = 0; - struct symdef def = {0}; - for (; dso; dso=dso->next) { - Sym *sym; - if (!dso->global) continue; - if ((ght = dso->ghashtab)) { - if (!ghm) { - gh = gnu_hash(s); - int maskbits = 8 * sizeof ghm; - gho = gh / maskbits; - ghm = 1ul << gh % maskbits; - } - sym = gnu_lookup_filtered(gh, ght, dso, s, gho, ghm); - } else { - if (!h) h = sysv_hash(s); - sym = sysv_lookup(s, h, dso); - } - if (!sym) continue; - if (!sym->st_shndx) - if (need_def || (sym->st_info&0xf) == STT_TLS - || ARCH_SYM_REJECT_UND(sym)) - continue; - if (!sym->st_value) - if ((sym->st_info&0xf) != STT_TLS) - continue; - if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue; - if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue; - - if (def.sym && sym->st_info>>4 == STB_WEAK) continue; - def.sym = sym; - def.dso = dso; - if (sym->st_info>>4 == STB_GLOBAL) break; - } - return def; -} - -__attribute__((__visibility__("hidden"))) -ptrdiff_t __tlsdesc_static(), __tlsdesc_dynamic(); - -static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride) -{ - unsigned char *base = dso->base; - Sym *syms = dso->syms; - char *strings = dso->strings; - Sym *sym; - const char *name; - void *ctx; - int type; - int sym_index; - struct symdef def; - size_t *reloc_addr; - size_t sym_val; - size_t tls_val; - size_t addend; - int skip_relative = 0, reuse_addends = 0, save_slot = 0; - - if (dso == &ldso) { - /* Only ldso's REL table needs addend saving/reuse. */ - if (rel == apply_addends_to) - reuse_addends = 1; - skip_relative = 1; - } - - for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) { - if (skip_relative && IS_RELATIVE(rel[1], dso->syms)) continue; - type = R_TYPE(rel[1]); - if (type == REL_NONE) continue; - sym_index = R_SYM(rel[1]); - reloc_addr = laddr(dso, rel[0]); - if (sym_index) { - sym = syms + sym_index; - name = strings + sym->st_name; - ctx = type==REL_COPY ? head->next : head; - def = (sym->st_info&0xf) == STT_SECTION - ? (struct symdef){ .dso = dso, .sym = sym } - : find_sym(ctx, name, type==REL_PLT); - if (!def.sym && (sym->st_shndx != SHN_UNDEF - || sym->st_info>>4 != STB_WEAK)) { - error("Error relocating %s: %s: symbol not found", - dso->name, name); - if (runtime) longjmp(*rtld_fail, 1); - continue; - } - } else { - sym = 0; - def.sym = 0; - def.dso = dso; - } - - if (stride > 2) { - addend = rel[2]; - } else if (type==REL_GOT || type==REL_PLT|| type==REL_COPY) { - addend = 0; - } else if (reuse_addends) { - /* Save original addend in stage 2 where the dso - * chain consists of just ldso; otherwise read back - * saved addend since the inline one was clobbered. */ - if (head==&ldso) - saved_addends[save_slot] = *reloc_addr; - addend = saved_addends[save_slot++]; - } else { - addend = *reloc_addr; - } - - sym_val = def.sym ? (size_t)laddr(def.dso, def.sym->st_value) : 0; - tls_val = def.sym ? def.sym->st_value : 0; - - switch(type) { - case REL_NONE: - break; - case REL_OFFSET: - addend -= (size_t)reloc_addr; - case REL_SYMBOLIC: - case REL_GOT: - case REL_PLT: - *reloc_addr = sym_val + addend; - break; - case REL_RELATIVE: - *reloc_addr = (size_t)base + addend; - break; - case REL_SYM_OR_REL: - if (sym) *reloc_addr = sym_val + addend; - else *reloc_addr = (size_t)base + addend; - break; - case REL_COPY: - memcpy(reloc_addr, (void *)sym_val, sym->st_size); - break; - case REL_OFFSET32: - *(uint32_t *)reloc_addr = sym_val + addend - - (size_t)reloc_addr; - break; - case REL_FUNCDESC: - *reloc_addr = def.sym ? (size_t)(def.dso->funcdescs - + (def.sym - def.dso->syms)) : 0; - break; - case REL_FUNCDESC_VAL: - if ((sym->st_info&0xf) == STT_SECTION) *reloc_addr += sym_val; - else *reloc_addr = sym_val; - reloc_addr[1] = def.sym ? (size_t)def.dso->got : 0; - break; - case REL_DTPMOD: - *reloc_addr = def.dso->tls_id; - break; - case REL_DTPOFF: - *reloc_addr = tls_val + addend - DTP_OFFSET; - break; -#ifdef TLS_ABOVE_TP - case REL_TPOFF: - *reloc_addr = tls_val + def.dso->tls.offset + TPOFF_K + addend; - break; -#else - case REL_TPOFF: - *reloc_addr = tls_val - def.dso->tls.offset + addend; - break; - case REL_TPOFF_NEG: - *reloc_addr = def.dso->tls.offset - tls_val + addend; - break; -#endif - case REL_TLSDESC: - if (stride<3) addend = reloc_addr[1]; - if (runtime && def.dso->tls_id >= static_tls_cnt) { - struct td_index *new = malloc(sizeof *new); - if (!new) { - error( - "Error relocating %s: cannot allocate TLSDESC for %s", - dso->name, sym ? name : "(local)" ); - longjmp(*rtld_fail, 1); - } - new->next = dso->td_index; - dso->td_index = new; - new->args[0] = def.dso->tls_id; - new->args[1] = tls_val + addend; - reloc_addr[0] = (size_t)__tlsdesc_dynamic; - reloc_addr[1] = (size_t)new; - } else { - reloc_addr[0] = (size_t)__tlsdesc_static; -#ifdef TLS_ABOVE_TP - reloc_addr[1] = tls_val + def.dso->tls.offset - + TPOFF_K + addend; -#else - reloc_addr[1] = tls_val - def.dso->tls.offset - + addend; -#endif - } - break; - default: - error("Error relocating %s: unsupported relocation type %d", - dso->name, type); - if (runtime) longjmp(*rtld_fail, 1); - continue; - } - } -} - -/* A huge hack: to make up for the wastefulness of shared libraries - * needing at least a page of dirty memory even if they have no global - * data, we reclaim the gaps at the beginning and end of writable maps - * and "donate" them to the heap by setting up minimal malloc - * structures and then freeing them. */ - -static void reclaim(struct dso *dso, size_t start, size_t end) -{ - size_t *a, *z; - if (start >= dso->relro_start && start < dso->relro_end) start = dso->relro_end; - if (end >= dso->relro_start && end < dso->relro_end) end = dso->relro_start; - 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 = laddr(dso, start); - z = laddr(dso, end); - a[-2] = 1; - a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1; - z[1] = 1; - free(a); -} - -static void reclaim_gaps(struct dso *dso) -{ - Phdr *ph = dso->phdr; - size_t phcnt = dso->phnum; - - if (DL_FDPIC) return; // FIXME - for (; phcnt--; ph=(void *)((char *)ph+dso->phentsize)) { - if (ph->p_type!=PT_LOAD) continue; - if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue; - reclaim(dso, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr); - reclaim(dso, ph->p_vaddr+ph->p_memsz, - ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE); - } -} - -static void *mmap_fixed(void *p, size_t n, int prot, int flags, int fd, off_t off) -{ - static int no_map_fixed; - char *q; - if (!no_map_fixed) { - q = mmap(p, n, prot, flags|MAP_FIXED, fd, off); - if (!DL_NOMMU_SUPPORT || q != MAP_FAILED || errno != EINVAL) - return q; - no_map_fixed = 1; - } - /* Fallbacks for MAP_FIXED failure on NOMMU kernels. */ - if (flags & MAP_ANONYMOUS) { - memset(p, 0, n); - return p; - } - ssize_t r; - if (lseek(fd, off, SEEK_SET) < 0) return MAP_FAILED; - for (q=p; n; q+=r, off+=r, n-=r) { - r = read(fd, q, n); - if (r < 0 && errno != EINTR) return MAP_FAILED; - if (!r) { - memset(q, 0, n); - break; - } - } - return p; -} - -static void unmap_library(struct dso *dso) -{ - if (dso->loadmap) { - size_t i; - for (i=0; i<dso->loadmap->nsegs; i++) { - if (!dso->loadmap->segs[i].p_memsz) - continue; - munmap((void *)dso->loadmap->segs[i].addr, - dso->loadmap->segs[i].p_memsz); - } - free(dso->loadmap); - } else if (dso->map && dso->map_len) { - munmap(dso->map, dso->map_len); - } -} - -static void *map_library(int fd, struct dso *dso) -{ - Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)]; - void *allocated_buf=0; - size_t phsize; - size_t addr_min=SIZE_MAX, addr_max=0, map_len; - size_t this_min, this_max; - size_t nsegs = 0; - off_t off_start; - Ehdr *eh; - Phdr *ph, *ph0; - unsigned prot; - unsigned char *map=MAP_FAILED, *base; - size_t dyn=0; - size_t tls_image=0; - size_t i; - - ssize_t l = read(fd, buf, sizeof buf); - eh = buf; - if (l<0) return 0; - if (l<sizeof *eh || (eh->e_type != ET_DYN && eh->e_type != ET_EXEC)) - goto noexec; - phsize = eh->e_phentsize * eh->e_phnum; - if (phsize > sizeof buf - sizeof *eh) { - allocated_buf = malloc(phsize); - if (!allocated_buf) return 0; - l = pread(fd, allocated_buf, phsize, eh->e_phoff); - if (l < 0) goto error; - if (l != phsize) goto noexec; - ph = ph0 = allocated_buf; - } else if (eh->e_phoff + phsize > l) { - l = pread(fd, buf+1, phsize, eh->e_phoff); - if (l < 0) goto error; - if (l != phsize) goto noexec; - ph = ph0 = (void *)(buf + 1); - } else { - ph = ph0 = (void *)((char *)buf + eh->e_phoff); - } - for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) { - if (ph->p_type == PT_DYNAMIC) { - dyn = ph->p_vaddr; - } else if (ph->p_type == PT_TLS) { - tls_image = ph->p_vaddr; - dso->tls.align = ph->p_align; - dso->tls.len = ph->p_filesz; - dso->tls.size = ph->p_memsz; - } else if (ph->p_type == PT_GNU_RELRO) { - dso->relro_start = ph->p_vaddr & -PAGE_SIZE; - dso->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE; - } - if (ph->p_type != PT_LOAD) continue; - nsegs++; - if (ph->p_vaddr < addr_min) { - addr_min = ph->p_vaddr; - off_start = ph->p_offset; - prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | - ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | - ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); - } - if (ph->p_vaddr+ph->p_memsz > addr_max) { - addr_max = ph->p_vaddr+ph->p_memsz; - } - } - if (!dyn) goto noexec; - if (DL_FDPIC && !(eh->e_flags & FDPIC_CONSTDISP_FLAG)) { - dso->loadmap = calloc(1, sizeof *dso->loadmap - + nsegs * sizeof *dso->loadmap->segs); - if (!dso->loadmap) goto error; - dso->loadmap->nsegs = nsegs; - for (ph=ph0, i=0; i<nsegs; ph=(void *)((char *)ph+eh->e_phentsize)) { - if (ph->p_type != PT_LOAD) continue; - prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | - ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | - ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); - map = mmap(0, ph->p_memsz + (ph->p_vaddr & PAGE_SIZE-1), - prot, MAP_PRIVATE, - fd, ph->p_offset & -PAGE_SIZE); - if (map == MAP_FAILED) { - unmap_library(dso); - goto error; - } - dso->loadmap->segs[i].addr = (size_t)map + - (ph->p_vaddr & PAGE_SIZE-1); - dso->loadmap->segs[i].p_vaddr = ph->p_vaddr; - dso->loadmap->segs[i].p_memsz = ph->p_memsz; - i++; - if (prot & PROT_WRITE) { - size_t brk = (ph->p_vaddr & PAGE_SIZE-1) - + ph->p_filesz; - size_t pgbrk = brk + PAGE_SIZE-1 & -PAGE_SIZE; - size_t pgend = brk + ph->p_memsz - ph->p_filesz - + PAGE_SIZE-1 & -PAGE_SIZE; - if (pgend > pgbrk && mmap_fixed(map+pgbrk, - pgend-pgbrk, prot, - MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, - -1, off_start) == MAP_FAILED) - goto error; - memset(map + brk, 0, pgbrk-brk); - } - } - map = (void *)dso->loadmap->segs[0].addr; - map_len = 0; - goto done_mapping; - } - addr_max += PAGE_SIZE-1; - addr_max &= -PAGE_SIZE; - addr_min &= -PAGE_SIZE; - off_start &= -PAGE_SIZE; - map_len = addr_max - addr_min + off_start; - /* The first time, we map too much, possibly even more than - * the length of the file. This is okay because we will not - * use the invalid part; we just need to reserve the right - * amount of virtual address space to map over later. */ - map = DL_NOMMU_SUPPORT - ? mmap((void *)addr_min, map_len, PROT_READ|PROT_WRITE|PROT_EXEC, - MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) - : mmap((void *)addr_min, map_len, prot, - MAP_PRIVATE, fd, off_start); - if (map==MAP_FAILED) goto error; - dso->map = map; - dso->map_len = map_len; - /* If the loaded file is not relocatable and the requested address is - * not available, then the load operation must fail. */ - if (eh->e_type != ET_DYN && addr_min && map!=(void *)addr_min) { - errno = EBUSY; - goto error; - } - base = map - addr_min; - dso->phdr = 0; - dso->phnum = 0; - for (ph=ph0, i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) { - if (ph->p_type != PT_LOAD) continue; - /* Check if the programs headers are in this load segment, and - * if so, record the address for use by dl_iterate_phdr. */ - if (!dso->phdr && eh->e_phoff >= ph->p_offset - && eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) { - dso->phdr = (void *)(base + ph->p_vaddr - + (eh->e_phoff-ph->p_offset)); - dso->phnum = eh->e_phnum; - dso->phentsize = eh->e_phentsize; - } - /* Reuse the existing mapping for the lowest-address LOAD */ - if ((ph->p_vaddr & -PAGE_SIZE) == addr_min && !DL_NOMMU_SUPPORT) - continue; - this_min = ph->p_vaddr & -PAGE_SIZE; - this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE; - off_start = ph->p_offset & -PAGE_SIZE; - prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | - ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | - ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); - if (mmap_fixed(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED) - goto error; - if (ph->p_memsz > ph->p_filesz) { - size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz; - size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE; - memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1); - if (pgbrk-(size_t)base < this_max && mmap_fixed((void *)pgbrk, (size_t)base+this_max-pgbrk, prot, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) == MAP_FAILED) - goto error; - } - } - for (i=0; ((size_t *)(base+dyn))[i]; i+=2) - if (((size_t *)(base+dyn))[i]==DT_TEXTREL) { - if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) - && errno != ENOSYS) - goto error; - break; - } -done_mapping: - dso->base = base; - dso->dynv = laddr(dso, dyn); - if (dso->tls.size) dso->tls.image = laddr(dso, tls_image); - if (!runtime) reclaim_gaps(dso); - free(allocated_buf); - return map; -noexec: - errno = ENOEXEC; -error: - if (map!=MAP_FAILED) unmap_library(dso); - free(allocated_buf); - return 0; -} - -static int path_open(const char *name, const char *s, char *buf, size_t buf_size) -{ - size_t l; - int fd; - for (;;) { - s += strspn(s, ":\n"); - l = strcspn(s, ":\n"); - if (l-1 >= INT_MAX) return -1; - if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) < buf_size) { - if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd; - switch (errno) { - case ENOENT: - case ENOTDIR: - case EACCES: - case ENAMETOOLONG: - break; - default: - /* Any negative value but -1 will inhibit - * futher path search. */ - return -2; - } - } - s += l; - } -} - -static int fixup_rpath(struct dso *p, char *buf, size_t buf_size) -{ - size_t n, l; - const char *s, *t, *origin; - char *d; - if (p->rpath || !p->rpath_orig) return 0; - if (!strchr(p->rpath_orig, '$')) { - p->rpath = p->rpath_orig; - return 0; - } - n = 0; - s = p->rpath_orig; - while ((t=strchr(s, '$'))) { - if (strncmp(t, "$ORIGIN", 7) && strncmp(t, "${ORIGIN}", 9)) - return 0; - s = t+1; - n++; - } - if (n > SSIZE_MAX/PATH_MAX) return 0; - - if (p->kernel_mapped) { - /* $ORIGIN searches cannot be performed for the main program - * when it is suid/sgid/AT_SECURE. This is because the - * pathname is under the control of the caller of execve. - * For libraries, however, $ORIGIN can be processed safely - * since the library's pathname came from a trusted source - * (either system paths or a call to dlopen). */ - if (libc.secure) - return 0; - l = readlink("/proc/self/exe", buf, buf_size); - if (l == -1) switch (errno) { - case ENOENT: - case ENOTDIR: - case EACCES: - break; - default: - return -1; - } - if (l >= buf_size) - return 0; - buf[l] = 0; - origin = buf; - } else { - origin = p->name; - } - t = strrchr(origin, '/'); - l = t ? t-origin : 0; - p->rpath = malloc(strlen(p->rpath_orig) + n*l + 1); - if (!p->rpath) return -1; - - d = p->rpath; - s = p->rpath_orig; - while ((t=strchr(s, '$'))) { - memcpy(d, s, t-s); - d += t-s; - memcpy(d, origin, l); - d += l; - /* It was determined previously that the '$' is followed - * either by "ORIGIN" or "{ORIGIN}". */ - s = t + 7 + 2*(t[1]=='{'); - } - strcpy(d, s); - return 0; -} - -static void decode_dyn(struct dso *p) -{ - size_t dyn[DYN_CNT]; - decode_vec(p->dynv, dyn, DYN_CNT); - p->syms = laddr(p, dyn[DT_SYMTAB]); - p->strings = laddr(p, dyn[DT_STRTAB]); - if (dyn[0]&(1<<DT_HASH)) - p->hashtab = laddr(p, dyn[DT_HASH]); - if (dyn[0]&(1<<DT_RPATH)) - p->rpath_orig = p->strings + dyn[DT_RPATH]; - if (dyn[0]&(1<<DT_RUNPATH)) - p->rpath_orig = p->strings + dyn[DT_RUNPATH]; - if (dyn[0]&(1<<DT_PLTGOT)) - p->got = laddr(p, dyn[DT_PLTGOT]); - if (search_vec(p->dynv, dyn, DT_GNU_HASH)) - p->ghashtab = laddr(p, *dyn); - if (search_vec(p->dynv, dyn, DT_VERSYM)) - p->versym = laddr(p, *dyn); -} - -static size_t count_syms(struct dso *p) -{ - if (p->hashtab) return p->hashtab[1]; - - size_t nsym, i; - uint32_t *buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4); - uint32_t *hashval; - for (i = nsym = 0; i < p->ghashtab[0]; i++) { - if (buckets[i] > nsym) - nsym = buckets[i]; - } - if (nsym) { - hashval = buckets + p->ghashtab[0] + (nsym - p->ghashtab[1]); - do nsym++; - while (!(*hashval++ & 1)); - } - return nsym; -} - -static void *dl_mmap(size_t n) -{ - void *p; - int prot = PROT_READ|PROT_WRITE, flags = MAP_ANONYMOUS|MAP_PRIVATE; -#ifdef SYS_mmap2 - p = (void *)__syscall(SYS_mmap2, 0, n, prot, flags, -1, 0); -#else - p = (void *)__syscall(SYS_mmap, 0, n, prot, flags, -1, 0); -#endif - return p == MAP_FAILED ? 0 : p; -} - -static void makefuncdescs(struct dso *p) -{ - static int self_done; - size_t nsym = count_syms(p); - size_t i, size = nsym * sizeof(*p->funcdescs); - - if (!self_done) { - p->funcdescs = dl_mmap(size); - self_done = 1; - } else { - p->funcdescs = malloc(size); - } - if (!p->funcdescs) { - if (!runtime) a_crash(); - error("Error allocating function descriptors for %s", p->name); - longjmp(*rtld_fail, 1); - } - for (i=0; i<nsym; i++) { - if ((p->syms[i].st_info&0xf)==STT_FUNC && p->syms[i].st_shndx) { - p->funcdescs[i].addr = laddr(p, p->syms[i].st_value); - p->funcdescs[i].got = p->got; - } else { - p->funcdescs[i].addr = 0; - p->funcdescs[i].got = 0; - } - } -} - -static struct dso *load_library(const char *name, struct dso *needed_by) -{ - char buf[2*NAME_MAX+2]; - const char *pathname; - unsigned char *map; - struct dso *p, temp_dso = {0}; - int fd; - struct stat st; - size_t alloc_size; - int n_th = 0; - int is_self = 0; - - if (!*name) { - errno = EINVAL; - return 0; - } - - /* Catch and block attempts to reload the implementation itself */ - if (name[0]=='l' && name[1]=='i' && name[2]=='b') { - static const char *rp, reserved[] = - "c\0pthread\0rt\0m\0dl\0util\0xnet\0"; - char *z = strchr(name, '.'); - if (z) { - size_t l = z-name; - for (rp=reserved; *rp && strncmp(name+3, rp, l-3); rp+=strlen(rp)+1); - if (*rp) { - if (ldd_mode) { - /* Track which names have been resolved - * and only report each one once. */ - static unsigned reported; - unsigned mask = 1U<<(rp-reserved); - if (!(reported & mask)) { - reported |= mask; - dprintf(1, "\t%s => %s (%p)\n", - name, ldso.name, - ldso.base); - } - } - is_self = 1; - } - } - } - if (!strcmp(name, ldso.name)) is_self = 1; - if (is_self) { - if (!ldso.prev) { - tail->next = &ldso; - ldso.prev = tail; - tail = ldso.next ? ldso.next : &ldso; - } - return &ldso; - } - if (strchr(name, '/')) { - pathname = name; - fd = open(name, O_RDONLY|O_CLOEXEC); - } else { - /* Search for the name to see if it's already loaded */ - for (p=head->next; p; p=p->next) { - if (p->shortname && !strcmp(p->shortname, name)) { - p->refcnt++; - return p; - } - } - if (strlen(name) > NAME_MAX) return 0; - fd = -1; - if (env_path) fd = path_open(name, env_path, buf, sizeof buf); - for (p=needed_by; fd == -1 && p; p=p->needed_by) { - if (fixup_rpath(p, buf, sizeof buf) < 0) - fd = -2; /* Inhibit further search. */ - if (p->rpath) - fd = path_open(name, p->rpath, buf, sizeof buf); - } - if (fd == -1) { - if (!sys_path) { - char *prefix = 0; - size_t prefix_len; - if (ldso.name[0]=='/') { - char *s, *t, *z; - for (s=t=z=ldso.name; *s; s++) - if (*s=='/') z=t, t=s; - prefix_len = z-ldso.name; - if (prefix_len < PATH_MAX) - prefix = ldso.name; - } - if (!prefix) { - prefix = ""; - prefix_len = 0; - } - char etc_ldso_path[prefix_len + 1 - + sizeof "/etc/ld-musl-" LDSO_ARCH ".path"]; - snprintf(etc_ldso_path, sizeof etc_ldso_path, - "%.*s/etc/ld-musl-" LDSO_ARCH ".path", - (int)prefix_len, prefix); - FILE *f = fopen(etc_ldso_path, "rbe"); - if (f) { - if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) { - free(sys_path); - sys_path = ""; - } - fclose(f); - } else if (errno != ENOENT) { - sys_path = ""; - } - } - if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib"; - fd = path_open(name, sys_path, buf, sizeof buf); - } - pathname = buf; - } - if (fd < 0) return 0; - if (fstat(fd, &st) < 0) { - close(fd); - return 0; - } - for (p=head->next; p; p=p->next) { - if (p->dev == st.st_dev && p->ino == st.st_ino) { - /* If this library was previously loaded with a - * pathname but a search found the same inode, - * setup its shortname so it can be found by name. */ - if (!p->shortname && pathname != name) - p->shortname = strrchr(p->name, '/')+1; - close(fd); - p->refcnt++; - return p; - } - } - map = noload ? 0 : map_library(fd, &temp_dso); - close(fd); - if (!map) return 0; - - /* Allocate storage for the new DSO. When there is TLS, this - * storage must include a reservation for all pre-existing - * threads to obtain copies of both the new TLS, and an - * extended DTV capable of storing an additional slot for - * the newly-loaded DSO. */ - alloc_size = sizeof *p + strlen(pathname) + 1; - if (runtime && temp_dso.tls.image) { - size_t per_th = temp_dso.tls.size + temp_dso.tls.align - + sizeof(void *) * (tls_cnt+3); - n_th = libc.threads_minus_1 + 1; - if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX; - else alloc_size += n_th * per_th; - } - p = calloc(1, alloc_size); - if (!p) { - unmap_library(&temp_dso); - return 0; - } - memcpy(p, &temp_dso, sizeof temp_dso); - decode_dyn(p); - p->dev = st.st_dev; - p->ino = st.st_ino; - p->refcnt = 1; - p->needed_by = needed_by; - p->name = p->buf; - strcpy(p->name, pathname); - /* Add a shortname only if name arg was not an explicit pathname. */ - if (pathname != name) p->shortname = strrchr(p->name, '/')+1; - if (p->tls.image) { - p->tls_id = ++tls_cnt; - tls_align = MAXP2(tls_align, p->tls.align); -#ifdef TLS_ABOVE_TP - p->tls.offset = tls_offset + ( (tls_align-1) & - -(tls_offset + (uintptr_t)p->tls.image) ); - tls_offset += p->tls.size; -#else - tls_offset += p->tls.size + p->tls.align - 1; - tls_offset -= (tls_offset + (uintptr_t)p->tls.image) - & (p->tls.align-1); - p->tls.offset = tls_offset; -#endif - p->new_dtv = (void *)(-sizeof(size_t) & - (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t))); - p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1)); - if (tls_tail) tls_tail->next = &p->tls; - else libc.tls_head = &p->tls; - tls_tail = &p->tls; - } - - tail->next = p; - p->prev = tail; - tail = p; - - if (DL_FDPIC) makefuncdescs(p); - - if (ldd_mode) dprintf(1, "\t%s => %s (%p)\n", name, pathname, p->base); - - return p; -} - -static void load_deps(struct dso *p) -{ - size_t i, ndeps=0; - struct dso ***deps = &p->deps, **tmp, *dep; - for (; p; p=p->next) { - for (i=0; p->dynv[i]; i+=2) { - if (p->dynv[i] != DT_NEEDED) continue; - dep = load_library(p->strings + p->dynv[i+1], p); - if (!dep) { - error("Error loading shared library %s: %m (needed by %s)", - p->strings + p->dynv[i+1], p->name); - if (runtime) longjmp(*rtld_fail, 1); - continue; - } - if (runtime) { - tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2)); - if (!tmp) longjmp(*rtld_fail, 1); - tmp[ndeps++] = dep; - tmp[ndeps] = 0; - *deps = tmp; - } - } - } -} - -static void load_preload(char *s) -{ - int tmp; - char *z; - for (z=s; *z; s=z) { - for ( ; *s && (isspace(*s) || *s==':'); s++); - for (z=s; *z && !isspace(*z) && *z!=':'; z++); - tmp = *z; - *z = 0; - load_library(s, 0); - *z = tmp; - } -} - -static void make_global(struct dso *p) -{ - for (; p; p=p->next) p->global = 1; -} - -static void do_mips_relocs(struct dso *p, size_t *got) -{ - size_t i, j, rel[2]; - unsigned char *base = p->base; - i=0; search_vec(p->dynv, &i, DT_MIPS_LOCAL_GOTNO); - if (p==&ldso) { - got += i; - } else { - while (i--) *got++ += (size_t)base; - } - j=0; search_vec(p->dynv, &j, DT_MIPS_GOTSYM); - i=0; search_vec(p->dynv, &i, DT_MIPS_SYMTABNO); - Sym *sym = p->syms + j; - rel[0] = (unsigned char *)got - base; - for (i-=j; i; i--, sym++, rel[0]+=sizeof(size_t)) { - rel[1] = sym-p->syms << 8 | R_MIPS_JUMP_SLOT; - do_relocs(p, rel, sizeof rel, 2); - } -} - -static void reloc_all(struct dso *p) -{ - size_t dyn[DYN_CNT]; - for (; p; p=p->next) { - if (p->relocated) continue; - decode_vec(p->dynv, dyn, DYN_CNT); - if (NEED_MIPS_GOT_RELOCS) - do_mips_relocs(p, laddr(p, dyn[DT_PLTGOT])); - do_relocs(p, laddr(p, dyn[DT_JMPREL]), dyn[DT_PLTRELSZ], - 2+(dyn[DT_PLTREL]==DT_RELA)); - do_relocs(p, laddr(p, dyn[DT_REL]), dyn[DT_RELSZ], 2); - do_relocs(p, laddr(p, dyn[DT_RELA]), dyn[DT_RELASZ], 3); - - if (head != &ldso && p->relro_start != p->relro_end && - mprotect(laddr(p, p->relro_start), p->relro_end-p->relro_start, PROT_READ) - && errno != ENOSYS) { - error("Error relocating %s: RELRO protection failed: %m", - p->name); - if (runtime) longjmp(*rtld_fail, 1); - } - - p->relocated = 1; - } -} - -static void kernel_mapped_dso(struct dso *p) -{ - size_t min_addr = -1, max_addr = 0, cnt; - Phdr *ph = p->phdr; - for (cnt = p->phnum; cnt--; ph = (void *)((char *)ph + p->phentsize)) { - if (ph->p_type == PT_DYNAMIC) { - 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; - } - 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; - p->kernel_mapped = 1; -} - -void __libc_exit_fini() -{ - struct dso *p; - size_t dyn[DYN_CNT]; - for (p=fini_head; p; p=p->fini_next) { - if (!p->constructed) continue; - 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 *)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]) - fpaddr(p, dyn[DT_FINI])(); -#endif - } -} - -static void do_init_fini(struct dso *p) -{ - size_t dyn[DYN_CNT]; - int need_locking = libc.threads_minus_1; - /* Allow recursive calls that arise when a library calls - * dlopen from one of its constructors, but block any - * other threads until all ctors have finished. */ - if (need_locking) pthread_mutex_lock(&init_fini_lock); - for (; p; p=p->prev) { - if (p->constructed) continue; - p->constructed = 1; - decode_vec(p->dynv, dyn, DYN_CNT); - if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) { - p->fini_next = fini_head; - fini_head = p; - } -#ifndef NO_LEGACY_INITFINI - if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT]) - fpaddr(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 = laddr(p, dyn[DT_INIT_ARRAY]); - while (n--) ((void (*)(void))*fn++)(); - } - if (!need_locking && libc.threads_minus_1) { - need_locking = 1; - pthread_mutex_lock(&init_fini_lock); - } - } - if (need_locking) pthread_mutex_unlock(&init_fini_lock); -} - -void __libc_start_init(void) -{ - do_init_fini(tail); -} - -static void dl_debug_state(void) -{ -} - -weak_alias(dl_debug_state, _dl_debug_state); - -void __init_tls(size_t *auxv) -{ -} - -__attribute__((__visibility__("hidden"))) -void *__tls_get_new(size_t *v) -{ - pthread_t self = __pthread_self(); - - /* Block signals to make accessing new TLS async-signal-safe */ - sigset_t set; - __block_all_sigs(&set); - if (v[0]<=(size_t)self->dtv[0]) { - __restore_sigs(&set); - return (char *)self->dtv[v[0]]+v[1]+DTP_OFFSET; - } - - /* This is safe without any locks held because, if the caller - * is able to request the Nth entry of the DTV, the DSO list - * must be valid at least that far out and it was synchronized - * at program startup or by an already-completed call to dlopen. */ - struct dso *p; - for (p=head; p->tls_id != v[0]; p=p->next); - - /* Get new DTV space from new DSO if needed */ - if (v[0] > (size_t)self->dtv[0]) { - void **newdtv = p->new_dtv + - (v[0]+1)*a_fetch_add(&p->new_dtv_idx,1); - memcpy(newdtv, self->dtv, - ((size_t)self->dtv[0]+1) * sizeof(void *)); - newdtv[0] = (void *)v[0]; - self->dtv = self->dtv_copy = newdtv; - } - - /* Get new TLS memory from all new DSOs up to the requested one */ - unsigned char *mem; - for (p=head; ; p=p->next) { - if (!p->tls_id || self->dtv[p->tls_id]) continue; - mem = p->new_tls + (p->tls.size + p->tls.align) - * a_fetch_add(&p->new_tls_idx,1); - mem += ((uintptr_t)p->tls.image - (uintptr_t)mem) - & (p->tls.align-1); - self->dtv[p->tls_id] = mem; - memcpy(mem, p->tls.image, p->tls.len); - if (p->tls_id == v[0]) break; - } - __restore_sigs(&set); - return mem + v[1] + DTP_OFFSET; -} - -static void update_tls_size() -{ - libc.tls_cnt = tls_cnt; - libc.tls_align = tls_align; - libc.tls_size = ALIGN( - (1+tls_cnt) * sizeof(void *) + - tls_offset + - sizeof(struct pthread) + - tls_align * 2, - tls_align); -} - -/* Stage 1 of the dynamic linker is defined in dlstart.c. It calls the - * following stage 2 and stage 3 functions via primitive symbolic lookup - * since it does not have access to their addresses to begin with. */ - -/* Stage 2 of the dynamic linker is called after relative relocations - * have been processed. It can make function calls to static functions - * and access string literals and static data, but cannot use extern - * symbols. Its job is to perform symbolic relocations on the dynamic - * linker itself, but some of the relocations performed may need to be - * replaced later due to copy relocations in the main program. */ - -__attribute__((__visibility__("hidden"))) -void __dls2(unsigned char *base, size_t *sp) -{ - if (DL_FDPIC) { - void *p1 = (void *)sp[-2]; - void *p2 = (void *)sp[-1]; - if (!p1) { - size_t *auxv, aux[AUX_CNT]; - for (auxv=sp+1+*sp+1; *auxv; auxv++); auxv++; - decode_vec(auxv, aux, AUX_CNT); - if (aux[AT_BASE]) ldso.base = (void *)aux[AT_BASE]; - else ldso.base = (void *)(aux[AT_PHDR] & -4096); - } - app_loadmap = p2 ? p1 : 0; - ldso.loadmap = p2 ? p2 : p1; - ldso.base = laddr(&ldso, 0); - } else { - ldso.base = base; - } - Ehdr *ehdr = (void *)ldso.base; - ldso.name = ldso.shortname = "libc.so"; - ldso.global = 1; - ldso.phnum = ehdr->e_phnum; - ldso.phdr = laddr(&ldso, ehdr->e_phoff); - ldso.phentsize = ehdr->e_phentsize; - kernel_mapped_dso(&ldso); - decode_dyn(&ldso); - - if (DL_FDPIC) makefuncdescs(&ldso); - - /* Prepare storage for to save clobbered REL addends so they - * can be reused in stage 3. There should be very few. If - * something goes wrong and there are a huge number, abort - * instead of risking stack overflow. */ - size_t dyn[DYN_CNT]; - decode_vec(ldso.dynv, dyn, DYN_CNT); - size_t *rel = laddr(&ldso, dyn[DT_REL]); - size_t rel_size = dyn[DT_RELSZ]; - size_t symbolic_rel_cnt = 0; - apply_addends_to = rel; - for (; rel_size; rel+=2, rel_size-=2*sizeof(size_t)) - if (!IS_RELATIVE(rel[1], ldso.syms)) symbolic_rel_cnt++; - if (symbolic_rel_cnt >= ADDEND_LIMIT) a_crash(); - size_t addends[symbolic_rel_cnt+1]; - saved_addends = addends; - - head = &ldso; - reloc_all(&ldso); - - ldso.relocated = 0; - - /* Call dynamic linker stage-3, __dls3, looking it up - * symbolically as a barrier against moving the address - * load across the above relocation processing. */ - struct symdef dls3_def = find_sym(&ldso, "__dls3", 0); - if (DL_FDPIC) ((stage3_func)&ldso.funcdescs[dls3_def.sym-ldso.syms])(sp); - else ((stage3_func)laddr(&ldso, dls3_def.sym->st_value))(sp); -} - -/* Stage 3 of the dynamic linker is called with the dynamic linker/libc - * fully functional. Its job is to load (if not already loaded) and - * process dependencies and relocations for the main application and - * transfer control to its entry point. */ - -_Noreturn void __dls3(size_t *sp) -{ - static struct dso app, vdso; - size_t aux[AUX_CNT], *auxv; - size_t i; - char *env_preload=0; - size_t vdso_base; - int argc = *sp; - char **argv = (void *)(sp+1); - char **argv_orig = argv; - char **envp = argv+argc+1; - - /* Find aux vector just past environ[] and use it to initialize - * global data that may be needed before we can make syscalls. */ - __environ = envp; - for (i=argc+1; argv[i]; i++); - libc.auxv = auxv = (void *)(argv+i+1); - decode_vec(auxv, aux, AUX_CNT); - __hwcap = aux[AT_HWCAP]; - libc.page_size = aux[AT_PAGESZ]; - libc.secure = ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID] - || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]); - - /* Setup early thread pointer in builtin_tls for ldso/libc itself to - * use during dynamic linking. If possible it will also serve as the - * thread pointer at runtime. */ - libc.tls_size = sizeof builtin_tls; - libc.tls_align = tls_align; - if (__init_tp(__copy_tls((void *)builtin_tls)) < 0) { - a_crash(); - } - - /* Only trust user/env if kernel says we're not suid/sgid */ - if (!libc.secure) { - env_path = getenv("LD_LIBRARY_PATH"); - env_preload = getenv("LD_PRELOAD"); - } - - /* If the main program was already loaded by the kernel, - * AT_PHDR will point to some location other than the dynamic - * linker's program headers. */ - if (aux[AT_PHDR] != (size_t)ldso.phdr) { - size_t interp_off = 0; - size_t tls_image = 0; - /* Find load address of the main program, via AT_PHDR vs PT_PHDR. */ - Phdr *phdr = app.phdr = (void *)aux[AT_PHDR]; - app.phnum = aux[AT_PHNUM]; - app.phentsize = aux[AT_PHENT]; - for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) { - if (phdr->p_type == PT_PHDR) - app.base = (void *)(aux[AT_PHDR] - phdr->p_vaddr); - else if (phdr->p_type == PT_INTERP) - interp_off = (size_t)phdr->p_vaddr; - else if (phdr->p_type == PT_TLS) { - tls_image = phdr->p_vaddr; - app.tls.len = phdr->p_filesz; - app.tls.size = phdr->p_memsz; - app.tls.align = phdr->p_align; - } - } - if (DL_FDPIC) app.loadmap = app_loadmap; - 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]; - else - app.name = argv[0]; - kernel_mapped_dso(&app); - } else { - int fd; - char *ldname = argv[0]; - size_t l = strlen(ldname); - if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1; - argv++; - while (argv[0] && argv[0][0]=='-' && argv[0][1]=='-') { - char *opt = argv[0]+2; - *argv++ = (void *)-1; - if (!*opt) { - break; - } else if (!memcmp(opt, "list", 5)) { - ldd_mode = 1; - } else if (!memcmp(opt, "library-path", 12)) { - if (opt[12]=='=') env_path = opt+13; - else if (opt[12]) *argv = 0; - else if (*argv) env_path = *argv++; - } else if (!memcmp(opt, "preload", 7)) { - if (opt[7]=='=') env_preload = opt+8; - else if (opt[7]) *argv = 0; - else if (*argv) env_preload = *argv++; - } else { - argv[0] = 0; - } - } - argv[-1] = (void *)(argc - (argv-argv_orig)); - if (!argv[0]) { - dprintf(2, "musl libc (" LDSO_ARCH ")\n" - "Version %s\n" - "Dynamic Program Loader\n" - "Usage: %s [options] [--] pathname%s\n", - __libc_get_version(), ldname, - ldd_mode ? "" : " [args]"); - _exit(1); - } - fd = open(argv[0], O_RDONLY); - if (fd < 0) { - dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno)); - _exit(1); - } - runtime = 1; - Ehdr *ehdr = (void *)map_library(fd, &app); - if (!ehdr) { - dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]); - _exit(1); - } - runtime = 0; - close(fd); - ldso.name = ldname; - app.name = argv[0]; - 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) { - for (i=0; i<app.phnum; i++) { - if (app.phdr[i].p_type == PT_INTERP) - ldso.name = laddr(&app, app.phdr[i].p_vaddr); - } - dprintf(1, "\t%s (%p)\n", ldso.name, ldso.base); - } - } - if (app.tls.size) { - libc.tls_head = &app.tls; - app.tls_id = tls_cnt = 1; -#ifdef TLS_ABOVE_TP - app.tls.offset = 0; - tls_offset = app.tls.size - + ( -((uintptr_t)app.tls.image + app.tls.size) - & (app.tls.align-1) ); -#else - tls_offset = app.tls.offset = app.tls.size - + ( -((uintptr_t)app.tls.image + app.tls.size) - & (app.tls.align-1) ); -#endif - tls_align = MAXP2(tls_align, app.tls.align); - } - app.global = 1; - decode_dyn(&app); - if (DL_FDPIC) { - makefuncdescs(&app); - if (!app.loadmap) { - app.loadmap = (void *)&app_dummy_loadmap; - app.loadmap->nsegs = 1; - app.loadmap->segs[0].addr = (size_t)app.map; - app.loadmap->segs[0].p_vaddr = (size_t)app.map - - (size_t)app.base; - app.loadmap->segs[0].p_memsz = app.map_len; - } - argv[-3] = (void *)app.loadmap; - } - - /* Attach to vdso, if provided by the kernel */ - if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) { - Ehdr *ehdr = (void *)vdso_base; - Phdr *phdr = vdso.phdr = (void *)(vdso_base + ehdr->e_phoff); - vdso.phnum = ehdr->e_phnum; - vdso.phentsize = ehdr->e_phentsize; - for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) { - if (phdr->p_type == PT_DYNAMIC) - vdso.dynv = (void *)(vdso_base + phdr->p_offset); - if (phdr->p_type == PT_LOAD) - vdso.base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset); - } - vdso.name = ""; - vdso.shortname = "linux-gate.so.1"; - vdso.global = 1; - vdso.relocated = 1; - decode_dyn(&vdso); - vdso.prev = &ldso; - ldso.next = &vdso; - } - - /* Initial dso chain consists only of the app. */ - head = tail = &app; - - /* Donate unused parts of app and library mapping to malloc */ - reclaim_gaps(&app); - reclaim_gaps(&ldso); - - /* Load preload/needed libraries, add their symbols to the global - * namespace, and perform all remaining relocations. */ - if (env_preload) load_preload(env_preload); - load_deps(&app); - make_global(&app); - -#ifndef DYNAMIC_IS_RO - for (i=0; app.dynv[i]; i+=2) - if (app.dynv[i]==DT_DEBUG) - app.dynv[i+1] = (size_t)&debug; -#endif - - /* The main program must be relocated LAST since it may contin - * copy relocations which depend on libraries' relocations. */ - reloc_all(app.next); - reloc_all(&app); - - update_tls_size(); - if (libc.tls_size > sizeof builtin_tls || tls_align > MIN_TLS_ALIGN) { - void *initial_tls = calloc(libc.tls_size, 1); - if (!initial_tls) { - dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n", - argv[0], libc.tls_size); - _exit(127); - } - if (__init_tp(__copy_tls(initial_tls)) < 0) { - a_crash(); - } - } else { - size_t tmp_tls_size = libc.tls_size; - pthread_t self = __pthread_self(); - /* Temporarily set the tls size to the full size of - * builtin_tls so that __copy_tls will use the same layout - * as it did for before. Then check, just to be safe. */ - libc.tls_size = sizeof builtin_tls; - if (__copy_tls((void*)builtin_tls) != self) a_crash(); - libc.tls_size = tmp_tls_size; - } - static_tls_cnt = tls_cnt; - - if (ldso_fail) _exit(127); - if (ldd_mode) _exit(0); - - /* Switch to runtime mode: any further failures in the dynamic - * linker are a reportable failure rather than a fatal startup - * error. */ - runtime = 1; - - debug.ver = 1; - debug.bp = dl_debug_state; - debug.head = head; - debug.base = ldso.base; - debug.state = 0; - _dl_debug_state(); - - errno = 0; - - CRTJMP((void *)aux[AT_ENTRY], argv-1); - for(;;); -} - -void *dlopen(const char *file, int mode) -{ - struct dso *volatile p, *orig_tail, *next; - struct tls_module *orig_tls_tail; - size_t orig_tls_cnt, orig_tls_offset, orig_tls_align; - size_t i; - int cs; - jmp_buf jb; - - if (!file) return head; - - pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); - pthread_rwlock_wrlock(&lock); - __inhibit_ptc(); - - p = 0; - orig_tls_tail = tls_tail; - orig_tls_cnt = tls_cnt; - orig_tls_offset = tls_offset; - orig_tls_align = tls_align; - orig_tail = tail; - noload = mode & RTLD_NOLOAD; - - rtld_fail = &jb; - if (setjmp(*rtld_fail)) { - /* Clean up anything new that was (partially) loaded */ - if (p && p->deps) for (i=0; p->deps[i]; i++) - if (p->deps[i]->global < 0) - p->deps[i]->global = 0; - for (p=orig_tail->next; p; p=next) { - next = p->next; - while (p->td_index) { - void *tmp = p->td_index->next; - free(p->td_index); - p->td_index = tmp; - } - free(p->funcdescs); - if (p->rpath != p->rpath_orig) - free(p->rpath); - free(p->deps); - unmap_library(p); - free(p); - } - if (!orig_tls_tail) libc.tls_head = 0; - tls_tail = orig_tls_tail; - tls_cnt = orig_tls_cnt; - tls_offset = orig_tls_offset; - tls_align = orig_tls_align; - tail = orig_tail; - tail->next = 0; - p = 0; - goto end; - } else p = load_library(file, head); - - if (!p) { - error(noload ? - "Library %s is not already loaded" : - "Error loading shared library %s: %m", - file); - goto end; - } - - /* First load handling */ - if (!p->deps) { - load_deps(p); - if (p->deps) for (i=0; p->deps[i]; i++) - if (!p->deps[i]->global) - p->deps[i]->global = -1; - if (!p->global) p->global = -1; - reloc_all(p); - if (p->deps) for (i=0; p->deps[i]; i++) - if (p->deps[i]->global < 0) - p->deps[i]->global = 0; - if (p->global < 0) p->global = 0; - } - - if (mode & RTLD_GLOBAL) { - if (p->deps) for (i=0; p->deps[i]; i++) - p->deps[i]->global = 1; - p->global = 1; - } - - update_tls_size(); - _dl_debug_state(); - orig_tail = tail; -end: - __release_ptc(); - if (p) gencnt++; - pthread_rwlock_unlock(&lock); - if (p) do_init_fini(orig_tail); - pthread_setcancelstate(cs, 0); - return p; -} - -__attribute__((__visibility__("hidden"))) -int __dl_invalid_handle(void *h) -{ - struct dso *p; - for (p=head; p; p=p->next) if (h==p) return 0; - error("Invalid library handle %p", (void *)h); - return 1; -} - -static void *addr2dso(size_t a) -{ - struct dso *p; - size_t i; - if (DL_FDPIC) for (p=head; p; p=p->next) { - i = count_syms(p); - if (a-(size_t)p->funcdescs < i*sizeof(*p->funcdescs)) - return p; - } - for (p=head; p; p=p->next) { - if (DL_FDPIC && p->loadmap) { - for (i=0; i<p->loadmap->nsegs; i++) { - if (a-p->loadmap->segs[i].p_vaddr - < p->loadmap->segs[i].p_memsz) - return p; - } - } else { - if (a-(size_t)p->map < p->map_len) - return p; - } - } - return 0; -} - -void *__tls_get_addr(size_t *); - -static void *do_dlsym(struct dso *p, const char *s, void *ra) -{ - size_t i; - uint32_t h = 0, gh = 0, *ght; - Sym *sym; - if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) { - if (p == RTLD_DEFAULT) { - p = head; - } else if (p == RTLD_NEXT) { - p = addr2dso((size_t)ra); - if (!p) p=head; - p = p->next; - } - struct symdef def = find_sym(p, s, 0); - 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}); - if (DL_FDPIC && (def.sym->st_info&0xf) == STT_FUNC) - return def.dso->funcdescs + (def.sym - def.dso->syms); - return laddr(def.dso, def.sym->st_value); - } - if (__dl_invalid_handle(p)) - return 0; - if ((ght = p->ghashtab)) { - gh = gnu_hash(s); - sym = gnu_lookup(gh, ght, p, s); - } else { - h = sysv_hash(s); - sym = sysv_lookup(s, h, p); - } - if (sym && (sym->st_info&0xf) == STT_TLS) - return __tls_get_addr((size_t []){p->tls_id, sym->st_value}); - if (DL_FDPIC && sym && sym->st_shndx && (sym->st_info&0xf) == STT_FUNC) - return p->funcdescs + (sym - p->syms); - if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) - 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); - sym = gnu_lookup(gh, ght, p->deps[i], s); - } else { - if (!h) h = sysv_hash(s); - sym = sysv_lookup(s, h, p->deps[i]); - } - if (sym && (sym->st_info&0xf) == STT_TLS) - return __tls_get_addr((size_t []){p->deps[i]->tls_id, sym->st_value}); - if (DL_FDPIC && sym && sym->st_shndx && (sym->st_info&0xf) == STT_FUNC) - return p->deps[i]->funcdescs + (sym - p->deps[i]->syms); - if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) - return laddr(p->deps[i], sym->st_value); - } -failed: - error("Symbol not found: %s", s); - return 0; -} - -int dladdr(const void *addr, Dl_info *info) -{ - struct dso *p; - Sym *sym, *bestsym; - uint32_t nsym; - char *strings; - void *best = 0; - - pthread_rwlock_rdlock(&lock); - p = addr2dso((size_t)addr); - pthread_rwlock_unlock(&lock); - - if (!p) return 0; - - sym = p->syms; - strings = p->strings; - nsym = count_syms(p); - - if (DL_FDPIC) { - size_t idx = ((size_t)addr-(size_t)p->funcdescs) - / sizeof(*p->funcdescs); - if (idx < nsym && (sym[idx].st_info&0xf) == STT_FUNC) { - best = p->funcdescs + idx; - bestsym = sym + idx; - } - } - - if (!best) for (; nsym; nsym--, sym++) { - if (sym->st_value - && (1<<(sym->st_info&0xf) & OK_TYPES) - && (1<<(sym->st_info>>4) & OK_BINDS)) { - void *symaddr = laddr(p, sym->st_value); - if (symaddr > addr || symaddr < best) - continue; - best = symaddr; - bestsym = sym; - if (addr == symaddr) - break; - } - } - - if (!best) return 0; - - if (DL_FDPIC && (bestsym->st_info&0xf) == STT_FUNC) - best = p->funcdescs + (bestsym - p->syms); - - info->dli_fname = p->name; - info->dli_fbase = p->base; - info->dli_sname = strings + bestsym->st_name; - info->dli_saddr = best; - - return 1; -} - -__attribute__((__visibility__("hidden"))) -void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) -{ - void *res; - pthread_rwlock_rdlock(&lock); - res = do_dlsym(p, s, ra); - pthread_rwlock_unlock(&lock); - return res; -} - -int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data) -{ - struct dso *current; - struct dl_phdr_info info; - int ret = 0; - for(current = head; current;) { - info.dlpi_addr = (uintptr_t)current->base; - info.dlpi_name = current->name; - info.dlpi_phdr = current->phdr; - info.dlpi_phnum = current->phnum; - info.dlpi_adds = gencnt; - info.dlpi_subs = 0; - info.dlpi_tls_modid = current->tls_id; - info.dlpi_tls_data = current->tls.image; - - ret = (callback)(&info, sizeof (info), data); - - if (ret != 0) break; - - pthread_rwlock_rdlock(&lock); - current = current->next; - pthread_rwlock_unlock(&lock); - } - return ret; -} - -__attribute__((__visibility__("hidden"))) -void __dl_vseterr(const char *, va_list); - -static void error(const char *fmt, ...) -{ - va_list ap; - va_start(ap, fmt); - if (!runtime) { - vdprintf(2, fmt, ap); - dprintf(2, "\n"); - ldso_fail = 1; - va_end(ap); - return; - } - __dl_vseterr(fmt, ap); - va_end(ap); -} -#endif diff --git a/src/ldso/tlsdesc.c b/src/ldso/tlsdesc.c index 4bc654fa..a2985cb6 100644 --- a/src/ldso/tlsdesc.c +++ b/src/ldso/tlsdesc.c @@ -1,5 +1,3 @@ -#ifdef SHARED - #include <stddef.h> #include "libc.h" @@ -12,5 +10,3 @@ ptrdiff_t __tlsdesc_static() } weak_alias(__tlsdesc_static, __tlsdesc_dynamic); - -#endif |