glibc/elf/dl-reloc.c
Ulrich Drepper b77ca0e827 Update.
2003-10-01  Thorsten Kukuk  <kukuk@suse.de>

	* elf/dl-reloc.c (_dl_allocate_static_tls): Move definition of
	variables only used if TLS_DTV_AT_TP is defined into the #if branch.
2003-10-02 18:58:31 +00:00

349 lines
11 KiB
C

/* Relocate a shared object and resolve its references to other loaded objects.
Copyright (C) 1995-2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <libintl.h>
#include <stdlib.h>
#include <unistd.h>
#include <ldsodefs.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/types.h>
#include "dynamic-link.h"
/* Statistics function. */
#ifdef SHARED
# define bump_num_cache_relocations() ++GL(dl_num_cache_relocations)
#else
# define bump_num_cache_relocations() ((void) 0)
#endif
#ifdef USE_TLS
/* We are trying to perform a static TLS relocation in MAP, but it was
dynamically loaded. This can only work if there is enough surplus in
the static TLS area already allocated for each running thread. If this
object's TLS segment is too big to fit, we fail. If it fits,
we set MAP->l_tls_offset and return.
This function intentionally does not return any value but signals error
directly, as static TLS should be rare and code handling it should
not be inlined as much as possible. */
void
internal_function __attribute_noinline__
_dl_allocate_static_tls (struct link_map *map)
{
size_t offset;
/* If the alignment requirements are too high fail. */
if (map->l_tls_align > GL(dl_tls_static_align))
{
fail:
INTUSE(_dl_signal_error) (0, map->l_name, NULL, N_("\
cannot allocate memory in static TLS block"));
}
# if TLS_TCB_AT_TP
size_t freebytes;
size_t n;
size_t blsize;
freebytes = GL(dl_tls_static_size) - GL(dl_tls_static_used) - TLS_TCB_SIZE;
blsize = map->l_tls_blocksize + map->l_tls_firstbyte_offset;
if (freebytes < blsize)
goto fail;
n = (freebytes - blsize) / map->l_tls_align;
offset = GL(dl_tls_static_used) + (freebytes - n * map->l_tls_align
- map->l_tls_firstbyte_offset);
map->l_tls_offset = GL(dl_tls_static_used) = offset;
# elif TLS_DTV_AT_TP
size_t used;
size_t check;
offset = roundup (GL(dl_tls_static_used), map->l_tls_align);
used = offset + map->l_tls_blocksize;
check = used;
/* dl_tls_static_used includes the TCB at the beginning. */
if (check > GL(dl_tls_static_size))
goto fail;
map->l_tls_offset = offset;
GL(dl_tls_static_used) = used;
# else
# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
# endif
if (map->l_relocated)
GL(dl_init_static_tls) (map);
else
map->l_need_tls_init = 1;
}
/* Initialize static TLS area and DTV for current (only) thread.
libpthread implementations should provide their own hook
to handle all threads. */
void
_dl_nothread_init_static_tls (struct link_map *map)
{
# if TLS_TCB_AT_TP
void *dest = (char *) THREAD_SELF - map->l_tls_offset;
# elif TLS_DTV_AT_TP
void *dest = (char *) THREAD_SELF + map->l_tls_offset + TLS_PRE_TCB_SIZE;
# else
# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
# endif
/* Fill in the DTV slot so that a later LD/GD access will find it. */
THREAD_DTV ()[map->l_tls_modid].pointer = dest;
/* Initialize the memory. */
memset (__mempcpy (dest, map->l_tls_initimage, map->l_tls_initimage_size),
'\0', map->l_tls_blocksize - map->l_tls_initimage_size);
}
#endif
void
_dl_relocate_object (struct link_map *l, struct r_scope_elem *scope[],
int lazy, int consider_profiling)
{
struct textrels
{
caddr_t start;
size_t len;
int prot;
struct textrels *next;
} *textrels = NULL;
/* Initialize it to make the compiler happy. */
const char *errstring = NULL;
if (l->l_relocated)
return;
/* If DT_BIND_NOW is set relocate all references in this object. We
do not do this if we are profiling, of course. */
if (!consider_profiling
&& __builtin_expect (l->l_info[DT_BIND_NOW] != NULL, 0))
lazy = 0;
if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_RELOC, 0))
INTUSE(_dl_debug_printf) ("\nrelocation processing: %s%s\n",
l->l_name[0] ? l->l_name : rtld_progname,
lazy ? " (lazy)" : "");
/* DT_TEXTREL is now in level 2 and might phase out at some time.
But we rewrite the DT_FLAGS entry to a DT_TEXTREL entry to make
testing easier and therefore it will be available at all time. */
if (__builtin_expect (l->l_info[DT_TEXTREL] != NULL, 0))
{
/* Bletch. We must make read-only segments writable
long enough to relocate them. */
const ElfW(Phdr) *ph;
for (ph = l->l_phdr; ph < &l->l_phdr[l->l_phnum]; ++ph)
if (ph->p_type == PT_LOAD && (ph->p_flags & PF_W) == 0)
{
struct textrels *newp;
newp = (struct textrels *) alloca (sizeof (*newp));
newp->len = (((ph->p_vaddr + ph->p_memsz + GL(dl_pagesize) - 1)
& ~(GL(dl_pagesize) - 1))
- (ph->p_vaddr & ~(GL(dl_pagesize) - 1)));
newp->start = ((ph->p_vaddr & ~(GL(dl_pagesize) - 1))
+ (caddr_t) l->l_addr);
if (__mprotect (newp->start, newp->len, PROT_READ|PROT_WRITE) < 0)
{
errstring = N_("cannot make segment writable for relocation");
call_error:
INTUSE(_dl_signal_error) (errno, l->l_name, NULL, errstring);
}
#if (PF_R | PF_W | PF_X) == 7 && (PROT_READ | PROT_WRITE | PROT_EXEC) == 7
newp->prot = (PF_TO_PROT
>> ((ph->p_flags & (PF_R | PF_W | PF_X)) * 4)) & 0xf;
#else
newp->prot = 0;
if (ph->p_flags & PF_R)
newp->prot |= PROT_READ;
if (ph->p_flags & PF_W)
newp->prot |= PROT_WRITE;
if (ph->p_flags & PF_X)
newp->prot |= PROT_EXEC;
#endif
newp->next = textrels;
textrels = newp;
}
}
{
/* Do the actual relocation of the object's GOT and other data. */
/* String table object symbols. */
const char *strtab = (const void *) D_PTR (l, l_info[DT_STRTAB]);
/* This macro is used as a callback from the ELF_DYNAMIC_RELOCATE code. */
#define RESOLVE_MAP(ref, version, r_type) \
(ELFW(ST_BIND) ((*ref)->st_info) != STB_LOCAL \
? ((__builtin_expect ((*ref) == l->l_lookup_cache.sym, 0) \
&& elf_machine_type_class (r_type) == l->l_lookup_cache.type_class) \
? (bump_num_cache_relocations (), \
(*ref) = l->l_lookup_cache.ret, \
l->l_lookup_cache.value) \
: ({ lookup_t _lr; \
int _tc = elf_machine_type_class (r_type); \
l->l_lookup_cache.type_class = _tc; \
l->l_lookup_cache.sym = (*ref); \
_lr = ((version) != NULL && (version)->hash != 0 \
? INTUSE(_dl_lookup_versioned_symbol) (strtab \
+ (*ref)->st_name, \
l, (ref), scope, \
(version), _tc, 0) \
: INTUSE(_dl_lookup_symbol) (strtab + (*ref)->st_name, l, \
(ref), scope, _tc, \
DL_LOOKUP_ADD_DEPENDENCY)); \
l->l_lookup_cache.ret = (*ref); \
l->l_lookup_cache.value = _lr; })) \
: l)
#define RESOLVE(ref, version, r_type) \
(ELFW(ST_BIND) ((*ref)->st_info) != STB_LOCAL \
? ((__builtin_expect ((*ref) == l->l_lookup_cache.sym, 0) \
&& elf_machine_type_class (r_type) == l->l_lookup_cache.type_class) \
? (bump_num_cache_relocations (), \
(*ref) = l->l_lookup_cache.ret, \
l->l_lookup_cache.value) \
: ({ lookup_t _lr; \
int _tc = elf_machine_type_class (r_type); \
l->l_lookup_cache.type_class = _tc; \
l->l_lookup_cache.sym = (*ref); \
_lr = ((version) != NULL && (version)->hash != 0 \
? INTUSE(_dl_lookup_versioned_symbol) (strtab \
+ (*ref)->st_name, \
l, (ref), scope, \
(version), _tc, 0) \
: INTUSE(_dl_lookup_symbol) (strtab + (*ref)->st_name, l, \
(ref), scope, _tc, \
DL_LOOKUP_ADD_DEPENDENCY)); \
l->l_lookup_cache.ret = (*ref); \
l->l_lookup_cache.value = _lr; })) \
: l->l_addr)
/* This macro is used as a callback from elf_machine_rel{a,} when a
static TLS reloc is about to be performed. Since (in dl-load.c) we
permit dynamic loading of objects that might use such relocs, we
have to check whether each use is actually doable. If the object
whose TLS segment the reference resolves to was allocated space in
the static TLS block at startup, then it's ok. Otherwise, we make
an attempt to allocate it in surplus space on the fly. If that
can't be done, we fall back to the error that DF_STATIC_TLS is
intended to produce. */
#define CHECK_STATIC_TLS(map, sym_map) \
do { \
if (__builtin_expect ((sym_map)->l_tls_offset == NO_TLS_OFFSET, 0)) \
_dl_allocate_static_tls (sym_map); \
} while (0)
#include "dynamic-link.h"
ELF_DYNAMIC_RELOCATE (l, lazy, consider_profiling);
if (__builtin_expect (consider_profiling, 0))
{
/* Allocate the array which will contain the already found
relocations. If the shared object lacks a PLT (for example
if it only contains lead function) the l_info[DT_PLTRELSZ]
will be NULL. */
if (l->l_info[DT_PLTRELSZ] == NULL)
{
errstring = N_("%s: profiler found no PLTREL in object %s\n");
fatal:
_dl_fatal_printf (errstring,
rtld_progname ?: "<program name unknown>",
l->l_name);
}
l->l_reloc_result =
(ElfW(Addr) *) calloc (sizeof (ElfW(Addr)),
l->l_info[DT_PLTRELSZ]->d_un.d_val);
if (l->l_reloc_result == NULL)
{
errstring = N_("\
%s: profiler out of memory shadowing PLTREL of %s\n");
goto fatal;
}
}
}
/* Mark the object so we know this work has been done. */
l->l_relocated = 1;
/* Undo the segment protection changes. */
while (__builtin_expect (textrels != NULL, 0))
{
if (__mprotect (textrels->start, textrels->len, textrels->prot) < 0)
{
errstring = N_("cannot restore segment prot after reloc");
goto call_error;
}
textrels = textrels->next;
}
}
INTDEF (_dl_relocate_object)
void
internal_function __attribute_noinline__
_dl_reloc_bad_type (struct link_map *map, unsigned int type, int plt)
{
extern const char INTUSE(_itoa_lower_digits)[] attribute_hidden;
#define DIGIT(b) INTUSE(_itoa_lower_digits)[(b) & 0xf];
/* XXX We cannot translate these messages. */
static const char msg[2][32
#if __ELF_NATIVE_CLASS == 64
+ 6
#endif
] = { "unexpected reloc type 0x",
"unexpected PLT reloc type 0x" };
char msgbuf[sizeof (msg[0])];
char *cp;
cp = __stpcpy (msgbuf, msg[plt]);
#if __ELF_NATIVE_CLASS == 64
if (__builtin_expect(type > 0xff, 0))
{
*cp++ = DIGIT (type >> 28);
*cp++ = DIGIT (type >> 24);
*cp++ = DIGIT (type >> 20);
*cp++ = DIGIT (type >> 16);
*cp++ = DIGIT (type >> 12);
*cp++ = DIGIT (type >> 8);
}
#endif
*cp++ = DIGIT (type >> 4);
*cp++ = DIGIT (type);
*cp = '\0';
INTUSE(_dl_signal_error) (0, map->l_name, NULL, msgbuf);
}