diff options
Diffstat (limited to 'elf/dl-tls.c')
| -rw-r--r-- | elf/dl-tls.c | 79 |
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 */ |