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authorJakub Jelinek <jakub@redhat.com>2007-07-31 13:33:18 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-31 13:33:18 +0000
commit32c075e1f01849e161724bbd400ba77244e482cc (patch)
tree5f083a3f352104f32bb6c902d57fa3f294bd8d4d /elf/dl-tls.c
parentd6220e9ee38c1c9285221b023346201ec5f511b3 (diff)
downloadglibc-32c075e1f01849e161724bbd400ba77244e482cc.tar.gz
.
Diffstat (limited to 'elf/dl-tls.c')
-rw-r--r--elf/dl-tls.c79
1 files changed, 42 insertions, 37 deletions
diff --git a/elf/dl-tls.c b/elf/dl-tls.c
index d5865ab409..a0f4f77ffa 100644
--- a/elf/dl-tls.c
+++ b/elf/dl-tls.c
@@ -26,26 +26,30 @@
#include <sys/param.h>
#include <tls.h>
-#include <dl-tls.h>
-#include <ldsodefs.h>
+
+/* We don't need any of this if TLS is not supported. */
+#ifdef USE_TLS
+
+# include <dl-tls.h>
+# include <ldsodefs.h>
/* Amount of excess space to allocate in the static TLS area
to allow dynamic loading of modules defining IE-model TLS data. */
-#define TLS_STATIC_SURPLUS 64 + DL_NNS * 100
+# define TLS_STATIC_SURPLUS 64 + DL_NNS * 100
/* Value used for dtv entries for which the allocation is delayed. */
-#define TLS_DTV_UNALLOCATED ((void *) -1l)
+# define TLS_DTV_UNALLOCATED ((void *) -1l)
/* Out-of-memory handler. */
-#ifdef SHARED
+# ifdef SHARED
static void
__attribute__ ((__noreturn__))
oom (void)
{
_dl_fatal_printf ("cannot allocate memory for thread-local data: ABORT\n");
}
-#endif
+# endif
size_t
@@ -109,7 +113,7 @@ _dl_next_tls_modid (void)
}
-#ifdef SHARED
+# ifdef SHARED
void
internal_function
_dl_determine_tlsoffset (void)
@@ -154,7 +158,7 @@ _dl_determine_tlsoffset (void)
memory requirement for the next TLS block is smaller than the
gap. */
-#if TLS_TCB_AT_TP
+# if TLS_TCB_AT_TP
/* We simply start with zero. */
size_t offset = 0;
@@ -201,7 +205,7 @@ _dl_determine_tlsoffset (void)
GL(dl_tls_static_used) = offset;
GL(dl_tls_static_size) = (roundup (offset + TLS_STATIC_SURPLUS, max_align)
+ TLS_TCB_SIZE);
-#elif TLS_DTV_AT_TP
+# elif TLS_DTV_AT_TP
/* The TLS blocks start right after the TCB. */
size_t offset = TLS_TCB_SIZE;
@@ -245,9 +249,9 @@ _dl_determine_tlsoffset (void)
GL(dl_tls_static_used) = offset;
GL(dl_tls_static_size) = roundup (offset + TLS_STATIC_SURPLUS,
TLS_TCB_ALIGN);
-#else
-# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
-#endif
+# else
+# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
+# endif
/* The alignment requirement for the static TLS block. */
GL(dl_tls_static_align) = max_align;
@@ -284,7 +288,7 @@ _dl_tls_setup (void)
return 0;
}
rtld_hidden_def (_dl_tls_setup)
-#endif
+# endif
static void *
internal_function
@@ -333,13 +337,13 @@ _dl_allocate_tls_storage (void)
void *result;
size_t size = GL(dl_tls_static_size);
-#if TLS_DTV_AT_TP
+# if TLS_DTV_AT_TP
/* Memory layout is:
[ TLS_PRE_TCB_SIZE ] [ TLS_TCB_SIZE ] [ TLS blocks ]
^ This should be returned. */
size += (TLS_PRE_TCB_SIZE + GL(dl_tls_static_align) - 1)
& ~(GL(dl_tls_static_align) - 1);
-#endif
+# endif
/* Allocate a correctly aligned chunk of memory. */
result = __libc_memalign (GL(dl_tls_static_align), size);
@@ -348,14 +352,14 @@ _dl_allocate_tls_storage (void)
/* Allocate the DTV. */
void *allocated = result;
-#if TLS_TCB_AT_TP
+# if TLS_TCB_AT_TP
/* The TCB follows the TLS blocks. */
result = (char *) result + size - TLS_TCB_SIZE;
/* Clear the TCB data structure. We can't ask the caller (i.e.
libpthread) to do it, because we will initialize the DTV et al. */
memset (result, '\0', TLS_TCB_SIZE);
-#elif TLS_DTV_AT_TP
+# elif TLS_DTV_AT_TP
result = (char *) result + size - GL(dl_tls_static_size);
/* Clear the TCB data structure and TLS_PRE_TCB_SIZE bytes before it.
@@ -363,7 +367,7 @@ _dl_allocate_tls_storage (void)
initialize the DTV et al. */
memset ((char *) result - TLS_PRE_TCB_SIZE, '\0',
TLS_PRE_TCB_SIZE + TLS_TCB_SIZE);
-#endif
+# endif
result = allocate_dtv (result);
if (result == NULL)
@@ -424,14 +428,14 @@ _dl_allocate_tls_init (void *result)
assert (map->l_tls_modid == cnt);
assert (map->l_tls_blocksize >= map->l_tls_initimage_size);
-#if TLS_TCB_AT_TP
+# if TLS_TCB_AT_TP
assert ((size_t) map->l_tls_offset >= map->l_tls_blocksize);
dest = (char *) result - map->l_tls_offset;
-#elif TLS_DTV_AT_TP
+# elif TLS_DTV_AT_TP
dest = (char *) result + map->l_tls_offset;
-#else
-# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
-#endif
+# else
+# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
+# endif
/* Copy the initialization image and clear the BSS part. */
dtv[map->l_tls_modid].pointer.val = dest;
@@ -487,21 +491,21 @@ _dl_deallocate_tls (void *tcb, bool dealloc_tcb)
if (dealloc_tcb)
{
-#if TLS_TCB_AT_TP
+# if TLS_TCB_AT_TP
/* The TCB follows the TLS blocks. Back up to free the whole block. */
tcb -= GL(dl_tls_static_size) - TLS_TCB_SIZE;
-#elif TLS_DTV_AT_TP
+# elif TLS_DTV_AT_TP
/* Back up the TLS_PRE_TCB_SIZE bytes. */
tcb -= (TLS_PRE_TCB_SIZE + GL(dl_tls_static_align) - 1)
& ~(GL(dl_tls_static_align) - 1);
-#endif
+# endif
free (tcb);
}
}
rtld_hidden_def (_dl_deallocate_tls)
-#ifdef SHARED
+# ifdef SHARED
/* The __tls_get_addr function has two basic forms which differ in the
arguments. The IA-64 form takes two parameters, the module ID and
offset. The form used, among others, on IA-32 takes a reference to
@@ -509,15 +513,15 @@ rtld_hidden_def (_dl_deallocate_tls)
form seems to be more often used (in the moment) so we default to
it. Users of the IA-64 form have to provide adequate definitions
of the following macros. */
-# ifndef GET_ADDR_ARGS
-# define GET_ADDR_ARGS tls_index *ti
-# endif
-# ifndef GET_ADDR_MODULE
-# define GET_ADDR_MODULE ti->ti_module
-# endif
-# ifndef GET_ADDR_OFFSET
-# define GET_ADDR_OFFSET ti->ti_offset
-# endif
+# ifndef GET_ADDR_ARGS
+# define GET_ADDR_ARGS tls_index *ti
+# endif
+# ifndef GET_ADDR_MODULE
+# define GET_ADDR_MODULE ti->ti_module
+# endif
+# ifndef GET_ADDR_OFFSET
+# define GET_ADDR_OFFSET ti->ti_offset
+# endif
static void *
@@ -728,7 +732,7 @@ __tls_get_addr (GET_ADDR_ARGS)
return (char *) p + GET_ADDR_OFFSET;
}
-#endif
+# endif
/* Look up the module's TLS block as for __tls_get_addr,
@@ -836,3 +840,4 @@ cannot create TLS data structures"));
listp->slotinfo[idx].map = l;
listp->slotinfo[idx].gen = GL(dl_tls_generation) + 1;
}
+#endif /* use TLS */