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https://sourceware.org/git/glibc.git
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2002-08-21 Roland McGrath <roland@redhat.com>
* elf/rtld.c (_dl_start_final): Move defn before _dl_start so it can be inlined. Declare it with always_inline if [DONT_USE_BOOTSTRAP_MAP] and with noinline otherwise. Remove hack alloca use to prevent inlining, we can ask for it explicitly nowadays.
This commit is contained in:
Roland McGrath
parent
6a9340b515
commit
c2248c44e4
193
elf/rtld.c
193
elf/rtld.c
@ -146,6 +146,104 @@ RTLD_START
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# error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START"
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#endif
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#ifndef VALIDX
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# define VALIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \
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+ DT_EXTRANUM + DT_VALTAGIDX (tag))
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#endif
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#ifndef ADDRIDX
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# define ADDRIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \
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+ DT_EXTRANUM + DT_VALNUM + DT_ADDRTAGIDX (tag))
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#endif
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/* This is the second half of _dl_start (below). It can be inlined safely
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under DONT_USE_BOOTSTRAP_MAP, where it is careful not to make any GOT
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references. When the tools don't permit us to avoid using a GOT entry
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for _dl_rtld_global (no attribute_hidden support), we must make sure
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this function is not inlined (see below). */
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#ifdef DONT_USE_BOOTSTRAP_MAP
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static inline ElfW(Addr) __attribute__ ((always_inline))
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_dl_start_final (void *arg)
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#else
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static ElfW(Addr) __attribute__ ((noinline))
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_dl_start_final (void *arg, struct link_map *bootstrap_map_p)
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#endif
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{
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ElfW(Addr) start_addr;
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extern char _begin[] attribute_hidden;
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extern char _end[] attribute_hidden;
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if (HP_TIMING_AVAIL)
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{
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/* If it hasn't happen yet record the startup time. */
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if (! HP_TIMING_INLINE)
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HP_TIMING_NOW (start_time);
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/* Initialize the timing functions. */
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HP_TIMING_DIFF_INIT ();
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}
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/* Transfer data about ourselves to the permanent link_map structure. */
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#ifndef DONT_USE_BOOTSTRAP_MAP
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GL(dl_rtld_map).l_addr = bootstrap_map_p->l_addr;
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GL(dl_rtld_map).l_ld = bootstrap_map_p->l_ld;
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memcpy (GL(dl_rtld_map).l_info, bootstrap_map_p->l_info,
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sizeof GL(dl_rtld_map).l_info);
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GL(dl_rtld_map).l_mach = bootstrap_map_p->l_mach;
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#endif
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_dl_setup_hash (&GL(dl_rtld_map));
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GL(dl_rtld_map).l_opencount = 1;
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GL(dl_rtld_map).l_map_start = (ElfW(Addr)) _begin;
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GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end;
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/* Copy the TLS related data if necessary. */
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#if USE_TLS && !defined DONT_USE_BOOTSTRAP_MAP
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# ifdef HAVE___THREAD
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assert (bootstrap_map_p->l_tls_modid != 0);
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# else
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if (bootstrap_map_p->l_tls_modid != 0)
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# endif
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{
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GL(dl_rtld_map).l_tls_blocksize = bootstrap_map_p->l_tls_blocksize;
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GL(dl_rtld_map).l_tls_align = bootstrap_map_p->l_tls_align;
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GL(dl_rtld_map).l_tls_initimage_size
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= bootstrap_map_p->l_tls_initimage_size;
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GL(dl_rtld_map).l_tls_initimage = bootstrap_map_p->l_tls_initimage;
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GL(dl_rtld_map).l_tls_offset = bootstrap_map_p->l_tls_offset;
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GL(dl_rtld_map).l_tls_modid = 1;
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GL(dl_rtld_map).l_tls_tp_initialized
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= bootstrap_map_p->l_tls_tp_initialized;
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}
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#endif
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#if HP_TIMING_AVAIL
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HP_TIMING_NOW (GL(dl_cpuclock_offset));
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#endif
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/* Call the OS-dependent function to set up life so we can do things like
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file access. It will call `dl_main' (below) to do all the real work
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of the dynamic linker, and then unwind our frame and run the user
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entry point on the same stack we entered on. */
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start_addr = _dl_sysdep_start (arg, &dl_main);
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#ifndef HP_TIMING_NONAVAIL
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if (HP_TIMING_AVAIL)
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{
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hp_timing_t end_time;
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/* Get the current time. */
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HP_TIMING_NOW (end_time);
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/* Compute the difference. */
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HP_TIMING_DIFF (rtld_total_time, start_time, end_time);
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}
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#endif
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if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_STATISTICS, 0))
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print_statistics ();
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return start_addr;
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}
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static ElfW(Addr) __attribute_used__ internal_function
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_dl_start (void *arg)
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{
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@ -343,101 +441,6 @@ _dl_start (void *arg)
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}
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#ifndef VALIDX
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# define VALIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \
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+ DT_EXTRANUM + DT_VALTAGIDX (tag))
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#endif
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#ifndef ADDRIDX
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# define ADDRIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \
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+ DT_EXTRANUM + DT_VALNUM + DT_ADDRTAGIDX (tag))
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#endif
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#ifdef DONT_USE_BOOTSTRAP_MAP
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static ElfW(Addr)
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_dl_start_final (void *arg)
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#else
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static ElfW(Addr)
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_dl_start_final (void *arg, struct link_map *bootstrap_map_p)
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#endif
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{
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/* The use of `alloca' here looks ridiculous but it helps. The goal
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is to avoid the function from being inlined. There is no official
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way to do this so we use this trick. gcc never inlines functions
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which use `alloca'. */
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ElfW(Addr) *start_addr = alloca (sizeof (ElfW(Addr)));
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extern char _begin[] attribute_hidden;
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extern char _end[] attribute_hidden;
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if (HP_TIMING_AVAIL)
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{
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/* If it hasn't happen yet record the startup time. */
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if (! HP_TIMING_INLINE)
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HP_TIMING_NOW (start_time);
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/* Initialize the timing functions. */
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HP_TIMING_DIFF_INIT ();
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}
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/* Transfer data about ourselves to the permanent link_map structure. */
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#ifndef DONT_USE_BOOTSTRAP_MAP
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GL(dl_rtld_map).l_addr = bootstrap_map_p->l_addr;
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GL(dl_rtld_map).l_ld = bootstrap_map_p->l_ld;
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memcpy (GL(dl_rtld_map).l_info, bootstrap_map_p->l_info,
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sizeof GL(dl_rtld_map).l_info);
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GL(dl_rtld_map).l_mach = bootstrap_map_p->l_mach;
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#endif
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_dl_setup_hash (&GL(dl_rtld_map));
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GL(dl_rtld_map).l_opencount = 1;
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GL(dl_rtld_map).l_map_start = (ElfW(Addr)) _begin;
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GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end;
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/* Copy the TLS related data if necessary. */
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#if USE_TLS && !defined DONT_USE_BOOTSTRAP_MAP
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# ifdef HAVE___THREAD
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assert (bootstrap_map_p->l_tls_modid != 0);
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# else
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if (bootstrap_map_p->l_tls_modid != 0)
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# endif
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{
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GL(dl_rtld_map).l_tls_blocksize = bootstrap_map_p->l_tls_blocksize;
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GL(dl_rtld_map).l_tls_align = bootstrap_map_p->l_tls_align;
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GL(dl_rtld_map).l_tls_initimage_size
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= bootstrap_map_p->l_tls_initimage_size;
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GL(dl_rtld_map).l_tls_initimage = bootstrap_map_p->l_tls_initimage;
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GL(dl_rtld_map).l_tls_offset = bootstrap_map_p->l_tls_offset;
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GL(dl_rtld_map).l_tls_modid = 1;
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GL(dl_rtld_map).l_tls_tp_initialized
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= bootstrap_map_p->l_tls_tp_initialized;
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}
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#endif
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#if HP_TIMING_AVAIL
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HP_TIMING_NOW (GL(dl_cpuclock_offset));
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#endif
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/* Call the OS-dependent function to set up life so we can do things like
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file access. It will call `dl_main' (below) to do all the real work
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of the dynamic linker, and then unwind our frame and run the user
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entry point on the same stack we entered on. */
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*start_addr = _dl_sysdep_start (arg, &dl_main);
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#ifndef HP_TIMING_NONAVAIL
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if (HP_TIMING_AVAIL)
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{
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hp_timing_t end_time;
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/* Get the current time. */
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HP_TIMING_NOW (end_time);
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/* Compute the difference. */
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HP_TIMING_DIFF (rtld_total_time, start_time, end_time);
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}
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#endif
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if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_STATISTICS, 0))
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print_statistics ();
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return *start_addr;
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}
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/* Now life is peachy; we can do all normal operations.
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On to the real work. */
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