+#ifdef SHARED
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
static void error(const char *, ...);
-#ifdef SHARED
-
#define MAXP2(a,b) (-(-(a)&-(b)))
#define ALIGN(x,y) ((x)+(y)-1 & -(y))
};
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;
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[];
};
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 {
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++);
}
#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;
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(const char *s, uint32_t h1, struct dso *dso, uint32_t fofs, size_t fmask)
+static Sym *gnu_lookup_filtered(uint32_t h1, uint32_t *hashtab, struct dso *dso, const char *s, uint32_t fofs, size_t fmask)
{
- uint32_t *hashtab = dso->ghashtab;
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(s, h1, dso);
+ 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)
static struct symdef find_sym(struct dso *dso, const char *s, int need_def)
{
- uint32_t h = 0, gh, gho;
+ 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 (dso->ghashtab) {
+ 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(s, gh, dso, gho, ghm);
+ sym = gnu_lookup_filtered(gh, ght, dso, s, gho, ghm);
} else {
if (!h) h = sysv_hash(s);
sym = sysv_lookup(s, h, dso);
}
for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
- if (skip_relative && IS_RELATIVE(rel[1])) continue;
+ 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 = (void *)(base + rel[0]);
+ 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 = find_sym(ctx, name, type==REL_PLT);
+ 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",
addend = *reloc_addr;
}
- sym_val = def.sym ? (size_t)def.dso->base+def.sym->st_value : 0;
+ 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) {
*(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;
break;
#ifdef TLS_ABOVE_TP
case REL_TPOFF:
- *reloc_addr = tls_val + def.dso->tls_offset + TPOFF_K + addend;
+ *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;
+ *reloc_addr = tls_val - def.dso->tls.offset + addend;
break;
case REL_TPOFF_NEG:
- *reloc_addr = def.dso->tls_offset - tls_val + addend;
+ *reloc_addr = def.dso->tls.offset - tls_val + addend;
break;
#endif
case REL_TLSDESC:
} else {
reloc_addr[0] = (size_t)__tlsdesc_static;
#ifdef TLS_ABOVE_TP
- reloc_addr[1] = tls_val + def.dso->tls_offset
+ reloc_addr[1] = tls_val + def.dso->tls.offset
+ TPOFF_K + addend;
#else
- reloc_addr[1] = tls_val - def.dso->tls_offset
+ reloc_addr[1] = tls_val - def.dso->tls.offset
+ addend;
#endif
}
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)
{
- char *q = mmap(p, n, prot, flags, fd, off);
- if (q != MAP_FAILED || errno != EINVAL) return q;
+ 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;
}
+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;
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;
}
{
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 = (void *)(p->strings + dyn[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)
* 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 (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->relocated) continue;
decode_vec(p->dynv, dyn, DYN_CNT);
if (NEED_MIPS_GOT_RELOCS)
- do_mips_relocs(p, (void *)(p->base+dyn[DT_PLTGOT]));
- do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ],
+ 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 (head != &ldso && p->relro_start != p->relro_end &&
- mprotect(p->base+p->relro_start, p->relro_end-p->relro_start, PROT_READ)
+ 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);
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];
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
}
}
}
#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);
}
-static void dl_debug_state(void)
+void __libc_start_init(void)
{
+ do_init_fini(tail);
}
-weak_alias(dl_debug_state, _dl_debug_state);
-
-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;
-
-#ifdef TLS_ABOVE_TP
- dtv = (void **)(mem + libc.tls_size) - (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
- dtv = (void **)mem;
-
- 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
- dtv[0] = (void *)tls_cnt;
- td->dtv = td->dtv_copy = dtv;
- return td;
+void __init_tls(size_t *auxv)
+{
}
__attribute__((__visibility__("hidden")))
/* 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];
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)
+ 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);
+ 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);
+ memcpy(mem, p->tls.image, p->tls.len);
if (p->tls_id == v[0]) break;
}
__restore_sigs(&set);
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 +
* 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)
{
- Ehdr *ehdr = (void *)base;
- ldso.base = base;
+ 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 = (void *)(base + ehdr->e_phoff);
+ 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 = (void *)(base+dyn[DT_REL]);
+ 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])) symbolic_rel_cnt++;
+ 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;
* symbolically as a barrier against moving the address
* load across the above relocation processing. */
struct symdef dls3_def = find_sym(&ldso, "__dls3", 0);
- ((stage3_func)(ldso.base+dls3_def.sym->st_value))(sp);
+ 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
* 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();
}
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) ldso.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];
}
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 [options] [--] pathname%s\n",
close(fd);
ldso.name = ldname;
app.name = argv[0];
- aux[AT_ENTRY] = (size_t)app.base + ehdr->e_entry;
+ aux[AT_ENTRY] = (size_t)laddr(&app, ehdr->e_entry);
/* Find the name that would have been used for the dynamic
* linker had ldd not taken its place. */
if (ldd_mode) {
for (i=0; i<app.phnum; i++) {
if (app.phdr[i].p_type == PT_INTERP)
- ldso.name = (void *)(app.base
- + app.phdr[i].p_vaddr);
+ ldso.name = laddr(&app, app.phdr[i].p_vaddr);
}
dprintf(1, "\t%s (%p)\n", ldso.name, ldso.base);
}
}
- if (app.tls_size) {
+ 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;
+ }
/* Attach to vdso, if provided by the kernel */
if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) {
debug.state = 0;
_dl_debug_state();
- __init_libc(envp, argv[0]);
- atexit(do_fini);
errno = 0;
- do_init_fini(tail);
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;
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;
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 (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:
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;
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)
-{
- error("Invalid library handle %p", (void *)h);
- return 1;
-}
-void *dlopen(const char *file, int mode)
-{
- error("Dynamic loading not supported");
- return 0;
-}
-void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
-{
- error("Symbol not found: %s", s);
- 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) {
- error("Unsupported request %d", req);
- return -1;
- }
- *(struct link_map **)res = dso;
- return 0;
-}
-
-char *dlerror()
-{
- pthread_t self = __pthread_self();
- if (!self->dlerror_flag) return 0;
- self->dlerror_flag = 0;
- char *s = self->dlerror_buf;
- if (s == (void *)-1)
- return "Dynamic linker failed to allocate memory for error message";
- else
- return s;
-}
-int dlclose(void *p)
-{
- return invalid_dso_handle(p);
-}
-
-void __dl_thread_cleanup(void)
-{
- pthread_t self = __pthread_self();
- if (self->dlerror_buf != (void *)-1)
- free(self->dlerror_buf);
-}
+__attribute__((__visibility__("hidden")))
+void __dl_vseterr(const char *, va_list);
static void error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
-#ifdef SHARED
if (!runtime) {
vdprintf(2, fmt, ap);
dprintf(2, "\n");
va_end(ap);
return;
}
-#endif
- pthread_t self = __pthread_self();
- if (self->dlerror_buf != (void *)-1)
- free(self->dlerror_buf);
- size_t len = vsnprintf(0, 0, fmt, ap);
+ __dl_vseterr(fmt, ap);
va_end(ap);
- char *buf = malloc(len+1);
- if (buf) {
- va_start(ap, fmt);
- vsnprintf(buf, len+1, fmt, ap);
- va_end(ap);
- } else {
- buf = (void *)-1;
- }
- self->dlerror_buf = buf;
- self->dlerror_flag = 1;
}
+#endif
projects / oweals / musl.git / blobdiff