+#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 <dlfcn.h>
#include "pthread_impl.h"
#include "libc.h"
+#include "dynlink.h"
-static int errflag;
-static char errbuf[128];
-
-#ifdef SHARED
-
-#if ULONG_MAX == 0xffffffff
-typedef Elf32_Ehdr Ehdr;
-typedef Elf32_Phdr Phdr;
-typedef Elf32_Sym Sym;
-#define R_TYPE(x) ((x)&255)
-#define R_SYM(x) ((x)>>8)
-#else
-typedef Elf64_Ehdr Ehdr;
-typedef Elf64_Phdr Phdr;
-typedef Elf64_Sym Sym;
-#define R_TYPE(x) ((x)&0xffffffff)
-#define R_SYM(x) ((x)>>32)
-#endif
+static void error(const char *, ...);
#define MAXP2(a,b) (-(-(a)&-(b)))
#define ALIGN(x,y) ((x)+(y)-1 & -(y))
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;
char kernel_mapped;
struct dso **deps, *needed_by;
char *rpath_orig, *rpath;
- void *tls_image;
- size_t tls_len, tls_size, tls_align, tls_id, tls_offset;
+ struct tls_module tls;
+ size_t tls_id;
size_t relro_start, relro_end;
void **new_dtv;
unsigned char *new_tls;
- int new_dtv_idx, new_tls_idx;
+ 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 dso *dso;
};
-#include "reloc.h"
-
-void __init_ssp(size_t *);
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 dso *head, *tail, *ldso, *fini_head;
+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 ssp_used;
static int runtime;
static int ldd_mode;
static int ldso_fail;
static jmp_buf *rtld_fail;
static pthread_rwlock_t lock;
static struct debug debug;
-static size_t tls_cnt, tls_offset, tls_align = 4*sizeof(size_t);
+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 long long builtin_tls[(sizeof(struct pthread) + 64)/sizeof(long long)];
+static struct fdpic_loadmap *app_loadmap;
+static struct fdpic_dummy_loadmap app_dummy_loadmap;
struct debug *_dl_debug_addr = &debug;
-#define AUX_CNT 38
-#define DYN_CNT 34
+__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)
{
- memset(a, 0, cnt*sizeof(size_t));
- for (; v[0]; v+=2) if (v[0]<cnt) {
- a[0] |= 1ULL<<v[0];
+ 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];
}
}
const unsigned char *s = (void *)s0;
uint_fast32_t h = 5381;
for (; *s; s++)
- h = h*33 + *s;
+ h += h*32 + *s;
return h;
}
return 0;
}
-static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso)
+static Sym *gnu_lookup(uint32_t h1, uint32_t *hashtab, struct dso *dso, const char *s)
{
- Sym *syms = dso->syms;
- char *strings = dso->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 i = buckets[h1 % nbuckets];
if (!i) return 0;
- hashval = buckets + nbuckets + (i - hashtab[1]);
+ uint32_t *hashval = buckets + nbuckets + (i - hashtab[1]);
for (h1 |= 1; ; i++) {
- h2 = *hashval++;
- if ((!dso->versym || dso->versym[i] >= 0)
- && (h1 == (h2|1)) && !strcmp(s, strings + syms[i].st_name))
- return syms+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 = 0;
+ uint32_t h = 0, gh, gho, *ght;
+ size_t ghm = 0;
struct symdef def = {0};
- if (dso->ghashtab) {
- gh = gnu_hash(s);
- if (gh == 0x1f4039c9 && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
- } else {
- h = sysv_hash(s);
- if (h == 0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
- }
for (; dso; dso=dso->next) {
Sym *sym;
if (!dso->global) continue;
- if (dso->ghashtab) {
- if (!gh) gh = gnu_hash(s);
- sym = gnu_lookup(s, gh, dso);
+ 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)
+ 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)
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;
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 = IS_COPY(type) ? head->next : head;
- def = find_sym(ctx, name, IS_PLT(type));
+ 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)) {
- snprintf(errbuf, sizeof errbuf,
- "Error relocating %s: %s: symbol not found",
+ error("Error relocating %s: %s: symbol not found",
dso->name, name);
if (runtime) longjmp(*rtld_fail, 1);
- dprintf(2, "%s\n", errbuf);
- ldso_fail = 1;
continue;
}
} else {
sym = 0;
def.sym = 0;
- def.dso = 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;
}
- do_single_reloc(dso, base, (void *)(base + rel[0]), type,
- stride>2 ? rel[2] : 0, sym, sym?sym->st_size:0, def,
- def.sym?(size_t)(def.dso->base+def.sym->st_value):0);
}
}
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;
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;
}
}
+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)];
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;
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;
+ 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;
}
}
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;
* 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 = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE, fd, off_start);
+ 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) {
dso->phentsize = eh->e_phentsize;
}
/* Reuse the existing mapping for the lowest-address LOAD */
- if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue;
+ 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(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED)
+ 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((void *)pgbrk, (size_t)base+this_max-pgbrk, prot, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) == MAP_FAILED)
+ 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) < 0)
+ if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC)
+ && errno != ENOSYS)
goto error;
break;
}
- dso->map = map;
- dso->map_len = map_len;
+done_mapping:
dso->base = base;
- dso->dynv = (void *)(base+dyn);
- if (dso->tls_size) dso->tls_image = (void *)(base+tls_image);
+ 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) munmap(map, map_len);
+ if (map!=MAP_FAILED) unmap_library(dso);
free(allocated_buf);
return 0;
}
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)
- continue;
- if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd;
+ 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;
}
}
size_t n, l;
const char *s, *t, *origin;
char *d;
- if (p->rpath) return 0;
- if (!p->rpath_orig) return -1;
+ if (p->rpath || !p->rpath_orig) return 0;
if (!strchr(p->rpath_orig, '$')) {
p->rpath = p->rpath_orig;
return 0;
s = p->rpath_orig;
while ((t=strchr(s, '$'))) {
if (strncmp(t, "$ORIGIN", 7) && strncmp(t, "${ORIGIN}", 9))
- return -1;
+ return 0;
s = t+1;
n++;
}
- if (n > SSIZE_MAX/PATH_MAX) return -1;
+ if (n > SSIZE_MAX/PATH_MAX) return 0;
if (p->kernel_mapped) {
/* $ORIGIN searches cannot be performed for the main program
* since the library's pathname came from a trusted source
* (either system paths or a call to dlopen). */
if (libc.secure)
- return -1;
+ return 0;
l = readlink("/proc/self/exe", buf, buf_size);
- if (l >= 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 {
static void decode_dyn(struct dso *p)
{
- size_t dyn[DYN_CNT] = {0};
+ 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]);
+ 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 = (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 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)
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[] =
if (!(reported & mask)) {
reported |= mask;
dprintf(1, "\t%s => %s (%p)\n",
- name, ldso->name,
- ldso->base);
+ name, ldso.name,
+ ldso.base);
}
}
is_self = 1;
}
}
}
- if (!strcmp(name, ldso->name)) 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;
+ if (!ldso.prev) {
+ tail->next = &ldso;
+ ldso.prev = tail;
+ tail = ldso.next ? ldso.next : &ldso;
}
- return ldso;
+ return &ldso;
}
if (strchr(name, '/')) {
pathname = name;
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 < 0 && p; p=p->needed_by)
- if (!fixup_rpath(p, 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 < 0) {
+ }
+ if (fd == -1) {
if (!sys_path) {
char *prefix = 0;
size_t prefix_len;
- if (ldso->name[0]=='/') {
+ if (ldso.name[0]=='/') {
char *s, *t, *z;
- for (s=t=z=ldso->name; *s; s++)
+ for (s=t=z=ldso.name; *s; s++)
if (*s=='/') z=t, t=s;
- prefix_len = z-ldso->name;
+ prefix_len = z-ldso.name;
if (prefix_len < PATH_MAX)
- prefix = ldso->name;
+ prefix = ldso.name;
}
if (!prefix) {
prefix = "";
* 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
+ 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;
}
p = calloc(1, alloc_size);
if (!p) {
- munmap(map, temp_dso.map_len);
+ unmap_library(&temp_dso);
return 0;
}
memcpy(p, &temp_dso, sizeof temp_dso);
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) {
- if (runtime && !libc.has_thread_pointer) {
- munmap(map, p->map_len);
- free(p);
- errno = ENOSYS;
- return 0;
- }
+ if (p->tls.image) {
p->tls_id = ++tls_cnt;
- tls_align = MAXP2(tls_align, p->tls_align);
+ 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;
+ 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;
+ 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;
if (p->dynv[i] != DT_NEEDED) continue;
dep = load_library(p->strings + p->dynv[i+1], p);
if (!dep) {
- snprintf(errbuf, sizeof errbuf,
- "Error loading shared library %s: %m (needed by %s)",
+ error("Error loading shared library %s: %m (needed by %s)",
p->strings + p->dynv[i+1], p->name);
if (runtime) longjmp(*rtld_fail, 1);
- dprintf(2, "%s\n", errbuf);
- ldso_fail = 1;
continue;
}
if (runtime) {
int tmp;
char *z;
for (z=s; *z; s=z) {
- for ( ; *s && isspace(*s); s++);
- for (z=s; *z && !isspace(*z); z++);
+ for ( ; *s && (isspace(*s) || *s==':'); s++);
+ for (z=s; *z && !isspace(*z) && *z!=':'; z++);
tmp = *z;
*z = 0;
load_library(s, 0);
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] = {0};
+ size_t dyn[DYN_CNT];
for (; p; p=p->next) {
if (p->relocated) continue;
decode_vec(p->dynv, dyn, DYN_CNT);
-#ifdef NEED_ARCH_RELOCS
- do_arch_relocs(p, head);
-#endif
- do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ],
+ 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, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2);
- do_relocs(p, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], 3);
+ 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 (p->relro_start != p->relro_end &&
- mprotect(p->base+p->relro_start, p->relro_end-p->relro_start, PROT_READ) < 0) {
- snprintf(errbuf, sizeof errbuf,
- "Error relocating %s: RELRO protection failed: %m",
+ 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);
- dprintf(2, "%s\n", errbuf);
- ldso_fail = 1;
}
p->relocated = 1;
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;
p->kernel_mapped = 1;
}
-static void do_fini()
+void __libc_exit_fini()
{
struct dso *p;
- size_t dyn[DYN_CNT] = {0};
+ 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 *)(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]))();
+ fpaddr(p, dyn[DT_FINI])();
#endif
}
}
static void do_init_fini(struct dso *p)
{
- size_t dyn[DYN_CNT] = {0};
+ 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
}
#ifndef NO_LEGACY_INITFINI
if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT])
- ((void (*)(void))(p->base + 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 = (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) {
if (need_locking) pthread_mutex_unlock(&init_fini_lock);
}
-void _dl_debug_state(void)
+void __libc_start_init(void)
{
+ do_init_fini(tail);
}
-void __reset_tls()
+static void dl_debug_state(void)
{
- pthread_t self = __pthread_self();
- struct dso *p;
- for (p=head; p; p=p->next) {
- if (!p->tls_id || !self->dtv[p->tls_id]) continue;
- memcpy(self->dtv[p->tls_id], p->tls_image, p->tls_len);
- memset((char *)self->dtv[p->tls_id]+p->tls_len, 0,
- p->tls_size - p->tls_len);
- if (p->tls_id == (size_t)self->dtv[0]) break;
- }
}
-void *__copy_tls(unsigned char *mem)
-{
- pthread_t td;
- struct dso *p;
-
- void **dtv = (void *)mem;
- dtv[0] = (void *)tls_cnt;
- if (!tls_cnt) {
- td = (void *)(dtv+1);
- td->dtv = dtv;
- return td;
- }
-
-#ifdef TLS_ABOVE_TP
- mem += sizeof(void *) * (tls_cnt+1);
- mem += -((uintptr_t)mem + sizeof(struct pthread)) & (tls_align-1);
- td = (pthread_t)mem;
- mem += sizeof(struct pthread);
-
- for (p=head; p; p=p->next) {
- if (!p->tls_id) continue;
- dtv[p->tls_id] = mem + p->tls_offset;
- memcpy(dtv[p->tls_id], p->tls_image, p->tls_len);
- }
-#else
- mem += libc.tls_size - sizeof(struct pthread);
- mem -= (uintptr_t)mem & (tls_align-1);
- td = (pthread_t)mem;
+weak_alias(dl_debug_state, _dl_debug_state);
- for (p=head; p; p=p->next) {
- if (!p->tls_id) continue;
- dtv[p->tls_id] = mem - p->tls_offset;
- memcpy(dtv[p->tls_id], p->tls_image, p->tls_len);
- }
-#endif
- td->dtv = dtv;
- return td;
+void __init_tls(size_t *auxv)
+{
}
-void *__tls_get_addr(size_t *v)
+__attribute__((__visibility__("hidden")))
+void *__tls_get_new(size_t *v)
{
pthread_t self = __pthread_self();
- if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]])
- return (char *)self->dtv[v[0]]+v[1];
/* Block signals to make accessing new TLS async-signal-safe */
sigset_t set;
- pthread_sigmask(SIG_BLOCK, SIGALL_SET, &set);
- if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) {
- pthread_sigmask(SIG_SETMASK, &set, 0);
- return (char *)self->dtv[v[0]]+v[1];
+ __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
/* 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)*sizeof(void *)*a_fetch_add(&p->new_dtv_idx,1);
+ (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 = newdtv;
+ self->dtv = self->dtv_copy = newdtv;
}
- /* Get new TLS memory from new DSO */
- unsigned char *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[v[0]] = mem;
- memcpy(mem, p->tls_image, p->tls_len);
- pthread_sigmask(SIG_SETMASK, &set, 0);
- return mem + v[1];
+ /* 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 +
tls_align);
}
-void *__dynlink(int argc, char **argv)
+/* 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)
{
- size_t aux[AUX_CNT] = {0};
+ 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;
- Phdr *phdr;
- Ehdr *ehdr;
- static struct dso builtin_dsos[3];
- struct dso *const app = builtin_dsos+0;
- struct dso *const lib = builtin_dsos+1;
- struct dso *const vdso = builtin_dsos+2;
char *env_preload=0;
size_t vdso_base;
- size_t *auxv;
+ int argc = *sp;
+ char **argv = (void *)(sp+1);
+ char **argv_orig = argv;
char **envp = argv+argc+1;
- void *initial_tls;
-
- /* Find aux vector just past environ[] */
- for (i=argc+1; argv[i]; i++)
- if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16))
- env_path = argv[i]+16;
- else if (!memcmp(argv[i], "LD_PRELOAD=", 11))
- env_preload = argv[i]+11;
- auxv = (void *)(argv+i+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 ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
- || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) {
- env_path = 0;
- env_preload = 0;
- libc.secure = 1;
+ if (!libc.secure) {
+ env_path = getenv("LD_LIBRARY_PATH");
+ env_preload = getenv("LD_PRELOAD");
}
- libc.page_size = aux[AT_PAGESZ];
- /* If the dynamic linker was invoked as a program itself, AT_BASE
- * will not be set. In that case, we assume the base address is
- * the start of the page containing the PHDRs; I don't know any
- * better approach... */
- if (!aux[AT_BASE]) {
- aux[AT_BASE] = aux[AT_PHDR] & -PAGE_SIZE;
- aux[AT_PHDR] = aux[AT_PHENT] = aux[AT_PHNUM] = 0;
- }
-
- /* The dynamic linker load address is passed by the kernel
- * in the AUX vector, so this is easy. */
- lib->base = (void *)aux[AT_BASE];
- lib->name = lib->shortname = "libc.so";
- lib->global = 1;
- ehdr = (void *)lib->base;
- lib->phnum = ehdr->e_phnum;
- lib->phdr = (void *)(aux[AT_BASE]+ehdr->e_phoff);
- lib->phentsize = ehdr->e_phentsize;
- kernel_mapped_dso(lib);
- decode_dyn(lib);
-
- if (aux[AT_PHDR]) {
+ /* 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. */
- app->phdr = phdr = (void *)aux[AT_PHDR];
- app->phnum = aux[AT_PHNUM];
- app->phentsize = aux[AT_PHENT];
+ 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);
+ 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;
+ app.tls.len = phdr->p_filesz;
+ app.tls.size = phdr->p_memsz;
+ app.tls.align = phdr->p_align;
}
}
- if (app->tls_size) app->tls_image = (char *)app->base + tls_image;
- if (interp_off) lib->name = (char *)app->base + interp_off;
+ 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];
+ app.name = (char *)aux[AT_EXECFN];
else
- app->name = argv[0];
- kernel_mapped_dso(app);
+ 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++ = (void *)-1;
- if (argv[0] && !strcmp(argv[0], "--")) *argv++ = (void *)-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\n"
+ dprintf(2, "musl libc (" LDSO_ARCH ")\n"
"Version %s\n"
"Dynamic Program Loader\n"
- "Usage: %s [--] pathname%s\n",
+ "Usage: %s [options] [--] pathname%s\n",
__libc_get_version(), ldname,
ldd_mode ? "" : " [args]");
_exit(1);
_exit(1);
}
runtime = 1;
- ehdr = (void *)map_library(fd, app);
+ 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);
- lib->name = ldname;
- app->name = argv[0];
- aux[AT_ENTRY] = (size_t)app->base + ehdr->e_entry;
+ 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)
- lib->name = (void *)(app->base
- + app->phdr[i].p_vaddr);
+ 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", lib->name, lib->base);
+ dprintf(1, "\t%s (%p)\n", ldso.name, ldso.base);
}
}
- if (app->tls_size) {
- app->tls_id = tls_cnt = 1;
+ 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) );
+ 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) );
+ 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);
+ 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;
}
- app->global = 1;
- decode_dyn(app);
/* Attach to vdso, if provided by the kernel */
if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) {
- ehdr = (void *)vdso_base;
- vdso->phdr = phdr = (void *)(vdso_base + ehdr->e_phoff);
- vdso->phnum = ehdr->e_phnum;
- vdso->phentsize = ehdr->e_phentsize;
+ 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);
+ 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.base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset);
}
- vdso->name = "";
- vdso->shortname = "linux-gate.so.1";
- vdso->global = 1;
- decode_dyn(vdso);
- vdso->prev = lib;
- lib->next = vdso;
- }
-
- /* Initial dso chain consists only of the app. We temporarily
- * append the dynamic linker/libc so we can relocate it, then
- * restore the initial chain in preparation for loading third
- * party libraries (preload/needed). */
- head = tail = app;
- ldso = lib;
- app->next = lib;
- reloc_all(lib);
- app->next = 0;
-
- /* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */
+ 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(lib);
+ reclaim_gaps(&app);
+ reclaim_gaps(&ldso);
/* Load preload/needed libraries, add their symbols to the global
- * namespace, and perform all remaining relocations. The main
- * program must be relocated LAST since it may contain copy
- * relocations which depend on libraries' relocations. */
+ * namespace, and perform all remaining relocations. */
if (env_preload) load_preload(env_preload);
- load_deps(app);
- make_global(app);
+ 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;
+ for (i=0; app.dynv[i]; i+=2)
+ if (app.dynv[i]==DT_DEBUG)
+ app.dynv[i+1] = (size_t)&debug;
#endif
- reloc_all(app->next);
- reloc_all(app);
+ /* 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) {
- initial_tls = calloc(libc.tls_size, 1);
+ 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 {
- initial_tls = builtin_tls;
- }
- if (__init_tp(__copy_tls(initial_tls)) < 0 && tls_cnt) {
- dprintf(2, "%s: Thread-local storage not supported by kernel.\n", argv[0]);
- _exit(127);
+ 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. If the dynamic loader (dlopen) will not be used, free
- * all memory used by the dynamic linker. */
+ * error. */
runtime = 1;
debug.ver = 1;
- debug.bp = _dl_debug_state;
+ debug.bp = dl_debug_state;
debug.head = head;
- debug.base = lib->base;
+ debug.base = ldso.base;
debug.state = 0;
_dl_debug_state();
- if (ssp_used) __init_ssp((void *)aux[AT_RANDOM]);
- __init_libc(envp, argv[0]);
- atexit(do_fini);
errno = 0;
- do_init_fini(tail);
- return (void *)aux[AT_ENTRY];
+ 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;
__inhibit_ptc();
p = 0;
+ orig_tls_tail = tls_tail;
orig_tls_cnt = tls_cnt;
orig_tls_offset = tls_offset;
orig_tls_align = tls_align;
p->deps[i]->global = 0;
for (p=orig_tail->next; p; p=next) {
next = p->next;
- munmap(p->map, p->map_len);
+ 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;
- errflag = 1;
goto end;
} else p = load_library(file, head);
if (!p) {
- snprintf(errbuf, sizeof errbuf, noload ?
+ error(noload ?
"Library %s is not already loaded" :
"Error loading shared library %s: %m",
file);
- errflag = 1;
goto end;
}
}
update_tls_size();
-
- if (ssp_used) __init_ssp(libc.auxv);
-
_dl_debug_state();
orig_tail = tail;
end:
return p;
}
-static int invalid_dso_handle(void *h)
+__attribute__((__visibility__("hidden")))
+int __dl_invalid_handle(void *h)
{
struct dso *p;
for (p=head; p; p=p->next) if (h==p) return 0;
- snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
- errflag = 1;
+ 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;
+ 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) {
- for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next);
+ p = addr2dso((size_t)ra);
if (!p) p=head;
p = p->next;
}
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;
+ 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 (p != RTLD_DEFAULT && p != RTLD_NEXT && invalid_dso_handle(p))
+ if (__dl_invalid_handle(p))
return 0;
- if (p->ghashtab) {
+ if ((ght = p->ghashtab)) {
gh = gnu_hash(s);
- sym = gnu_lookup(s, gh, p);
+ 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 p->base + sym->st_value;
+ return laddr(p, sym->st_value);
if (p->deps) for (i=0; p->deps[i]; i++) {
- if (p->deps[i]->ghashtab) {
+ if ((ght = p->deps[i]->ghashtab)) {
if (!gh) gh = gnu_hash(s);
- sym = gnu_lookup(s, gh, p->deps[i]);
+ 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 p->deps[i]->base + sym->st_value;
+ return laddr(p->deps[i], sym->st_value);
}
failed:
- errflag = 1;
- snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s);
+ error("Symbol not found: %s", s);
return 0;
}
-int __dladdr(const void *addr, Dl_info *info)
+int dladdr(const void *addr, Dl_info *info)
{
struct dso *p;
- Sym *sym;
+ Sym *sym, *bestsym;
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);
+ p = addr2dso((size_t)addr);
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 = nsym = 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));
+ 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;
}
}
- for (; nsym; nsym--, sym++) {
+ 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 = p->base + sym->st_value;
+ void *symaddr = laddr(p, sym->st_value);
if (symaddr > addr || symaddr < best)
continue;
best = symaddr;
- bestname = strings + sym->st_name;
+ 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 = bestname;
+ 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;
info.dlpi_adds = gencnt;
info.dlpi_subs = 0;
info.dlpi_tls_modid = current->tls_id;
- info.dlpi_tls_data = current->tls_image;
+ info.dlpi_tls_data = current->tls.image;
ret = (callback)(&info, sizeof (info), data);
}
return ret;
}
-#else
-static int invalid_dso_handle(void *h)
-{
- snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
- errflag = 1;
- return 1;
-}
-void *dlopen(const char *file, int mode)
-{
- return 0;
-}
-void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
-{
- return 0;
-}
-int __dladdr (const void *addr, Dl_info *info)
-{
- return 0;
-}
-#endif
-int __dlinfo(void *dso, int req, void *res)
-{
- if (invalid_dso_handle(dso)) return -1;
- if (req != RTLD_DI_LINKMAP) {
- snprintf(errbuf, sizeof errbuf, "Unsupported request %d", req);
- errflag = 1;
- return -1;
- }
- *(struct link_map **)res = dso;
- return 0;
-}
+__attribute__((__visibility__("hidden")))
+void __dl_vseterr(const char *, va_list);
-char *dlerror()
+static void error(const char *fmt, ...)
{
- if (!errflag) return 0;
- errflag = 0;
- return errbuf;
-}
-
-int dlclose(void *p)
-{
- return invalid_dso_handle(p);
+ 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
projects / oweals / musl.git / blobdiff