2001-08-26  Ulrich Drepper  <drepper@redhat.com>

	* config.h.in: Add HAVE_Z_COMBRELOC.
	* configure.in: Add test for -z combreloc.

	* sysdeps/i386/dl-machine.h (elf_machine_rel): Minor cleanups and
	optimizations.  Use HAVE_Z_COMBRELOC to avoid generaton of
	R_386_RELATIVE handling for ld.so startup.
This commit is contained in:
Ulrich Drepper 2001-08-26 09:17:23 +00:00
parent 7c69dc8bc8
commit a711b01d34
5 changed files with 110 additions and 57 deletions

View File

@ -1,3 +1,12 @@
2001-08-26 Ulrich Drepper <drepper@redhat.com>
* config.h.in: Add HAVE_Z_COMBRELOC.
* configure.in: Add test for -z combreloc.
* sysdeps/i386/dl-machine.h (elf_machine_rel): Minor cleanups and
optimizations. Use HAVE_Z_COMBRELOC to avoid generaton of
R_386_RELATIVE handling for ld.so startup.
2001-08-25 Ulrich Drepper <drepper@redhat.com>
* po/tr.po: Update from translation team.

View File

@ -86,6 +86,9 @@
certain registers (CR0, MQ, CTR, LR) in asm statements. */
#undef BROKEN_PPC_ASM_CR0
/* Define if the linker supports the -z combreloc option. */
#undef HAVE_Z_COMBRELOC
/* Defined to some form of __attribute__ ((...)) if the compiler supports
a different, more efficient calling convention. */

118
configure vendored
View File

@ -2282,7 +2282,7 @@ else
fi
for ac_prog in mawk gawk nawk awk
for ac_prog in gawk mawk nawk awk
do
# Extract the first word of "$ac_prog", so it can be a program name with args.
set dummy $ac_prog; ac_word=$2
@ -2874,16 +2874,38 @@ fi
echo "$ac_t""$libc_cv_Bgroup" 1>&6
echo $ac_n "checking for -z combreloc""... $ac_c" 1>&6
echo "configure:2880: checking for -z combreloc" >&5
if eval "test \"`echo '$''{'libc_cv_z_combreloc'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.c <<EOF
int foo (void) { return 0; }
EOF
if { ac_try='${CC-cc} -shared -o conftest.so conftest.c -Wl,-z,combreloc 1>&5'; { (eval echo configure:2887: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }
then
if readelf -S conftest.so | fgrep .rel.dyn > /dev/null; then
cat >> confdefs.h <<\EOF
#define HAVE_Z_COMBRELOC 1
EOF
fi
fi
rm -f conftest*
fi
echo "$ac_t""$libc_cv_z_combreloc" 1>&6
fi
if test $elf != yes; then
echo $ac_n "checking for .init and .fini sections""... $ac_c" 1>&6
echo "configure:2882: checking for .init and .fini sections" >&5
echo "configure:2904: checking for .init and .fini sections" >&5
if eval "test \"`echo '$''{'libc_cv_have_initfini'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.$ac_ext <<EOF
#line 2887 "configure"
#line 2909 "configure"
#include "confdefs.h"
int main() {
@ -2892,7 +2914,7 @@ asm (".section .init");
asm ("${libc_cv_dot_text}");
; return 0; }
EOF
if { (eval echo configure:2896: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
if { (eval echo configure:2918: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
rm -rf conftest*
libc_cv_have_initfini=yes
else
@ -2915,7 +2937,7 @@ fi
if test $elf = yes -a $gnu_ld = yes; then
echo $ac_n "checking whether cc puts quotes around section names""... $ac_c" 1>&6
echo "configure:2919: checking whether cc puts quotes around section names" >&5
echo "configure:2941: checking whether cc puts quotes around section names" >&5
if eval "test \"`echo '$''{'libc_cv_have_section_quotes'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
@ -2952,19 +2974,19 @@ if test $elf = yes; then
else
if test $ac_cv_prog_cc_works = yes; then
echo $ac_n "checking for _ prefix on C symbol names""... $ac_c" 1>&6
echo "configure:2956: checking for _ prefix on C symbol names" >&5
echo "configure:2978: checking for _ prefix on C symbol names" >&5
if eval "test \"`echo '$''{'libc_cv_asm_underscores'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.$ac_ext <<EOF
#line 2961 "configure"
#line 2983 "configure"
#include "confdefs.h"
asm ("_glibc_foobar:");
int main() {
glibc_foobar ();
; return 0; }
EOF
if { (eval echo configure:2968: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
if { (eval echo configure:2990: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
rm -rf conftest*
libc_cv_asm_underscores=yes
else
@ -2979,17 +3001,17 @@ fi
echo "$ac_t""$libc_cv_asm_underscores" 1>&6
else
echo $ac_n "checking for _ prefix on C symbol names""... $ac_c" 1>&6
echo "configure:2983: checking for _ prefix on C symbol names" >&5
echo "configure:3005: checking for _ prefix on C symbol names" >&5
if eval "test \"`echo '$''{'libc_cv_asm_underscores'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.$ac_ext <<EOF
#line 2988 "configure"
#line 3010 "configure"
#include "confdefs.h"
void underscore_test(void) {
return; }
EOF
if { (eval echo configure:2993: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
if { (eval echo configure:3015: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
if grep _underscore_test conftest* >/dev/null; then
rm -f conftest*
libc_cv_asm_underscores=yes
@ -3021,7 +3043,7 @@ if test $elf = yes; then
fi
echo $ac_n "checking for assembler .weak directive""... $ac_c" 1>&6
echo "configure:3025: checking for assembler .weak directive" >&5
echo "configure:3047: checking for assembler .weak directive" >&5
if eval "test \"`echo '$''{'libc_cv_asm_weak_directive'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
@ -3044,7 +3066,7 @@ echo "$ac_t""$libc_cv_asm_weak_directive" 1>&6
if test $libc_cv_asm_weak_directive = no; then
echo $ac_n "checking for assembler .weakext directive""... $ac_c" 1>&6
echo "configure:3048: checking for assembler .weakext directive" >&5
echo "configure:3070: checking for assembler .weakext directive" >&5
if eval "test \"`echo '$''{'libc_cv_asm_weakext_directive'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
@ -3091,14 +3113,14 @@ EOF
;;
hppa*linux*)
echo $ac_n "checking for assembler line separator""... $ac_c" 1>&6
echo "configure:3095: checking for assembler line separator" >&5
echo "configure:3117: checking for assembler line separator" >&5
if eval "test \"`echo '$''{'libc_cv_asm_line_sep'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.s <<EOF
nop ; is_old_puffin
EOF
if { ac_try='${CC-cc} -c $CFLAGS conftest.s 1>&5'; { (eval echo configure:3102: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
if { ac_try='${CC-cc} -c $CFLAGS conftest.s 1>&5'; { (eval echo configure:3124: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
libc_cv_asm_line_sep='!'
else
if test -z "$enable_hacker_mode"; then
@ -3120,7 +3142,7 @@ EOF
esac
echo $ac_n "checking for ld --no-whole-archive""... $ac_c" 1>&6
echo "configure:3124: checking for ld --no-whole-archive" >&5
echo "configure:3146: checking for ld --no-whole-archive" >&5
if eval "test \"`echo '$''{'libc_cv_ld_no_whole_archive'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
@ -3131,7 +3153,7 @@ __throw () {}
EOF
if { ac_try='${CC-cc} $CFLAGS
-nostdlib -nostartfiles -Wl,--no-whole-archive
-o conftest conftest.c 1>&5'; { (eval echo configure:3135: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
-o conftest conftest.c 1>&5'; { (eval echo configure:3157: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
libc_cv_ld_no_whole_archive=yes
else
libc_cv_ld_no_whole_archive=no
@ -3145,7 +3167,7 @@ if test $libc_cv_ld_no_whole_archive = yes; then
fi
echo $ac_n "checking for gcc -fexceptions""... $ac_c" 1>&6
echo "configure:3149: checking for gcc -fexceptions" >&5
echo "configure:3171: checking for gcc -fexceptions" >&5
if eval "test \"`echo '$''{'libc_cv_gcc_exceptions'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
@ -3156,7 +3178,7 @@ __throw () {}
EOF
if { ac_try='${CC-cc} $CFLAGS
-nostdlib -nostartfiles -fexceptions
-o conftest conftest.c 1>&5'; { (eval echo configure:3160: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
-o conftest conftest.c 1>&5'; { (eval echo configure:3182: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
libc_cv_gcc_exceptions=yes
else
libc_cv_gcc_exceptions=no
@ -3171,14 +3193,14 @@ fi
if test "$base_machine" = alpha ; then
echo $ac_n "checking for function ..ng prefix""... $ac_c" 1>&6
echo "configure:3175: checking for function ..ng prefix" >&5
echo "configure:3197: checking for function ..ng prefix" >&5
if eval "test \"`echo '$''{'libc_cv_gcc_alpha_ng_prefix'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.c <<\EOF
foo () { }
EOF
if { ac_try='${CC-cc} -S conftest.c -o - | fgrep "\$foo..ng" > /dev/null'; { (eval echo configure:3182: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; };
if { ac_try='${CC-cc} -S conftest.c -o - | fgrep "\$foo..ng" > /dev/null'; { (eval echo configure:3204: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; };
then
libc_cv_gcc_alpha_ng_prefix=yes
else
@ -3205,19 +3227,19 @@ if test "$host_cpu" = powerpc ; then
# Check for a bug present in at least versions 2.8.x of GCC
# and versions 1.0.x of EGCS.
echo $ac_n "checking whether clobbering cr0 causes problems""... $ac_c" 1>&6
echo "configure:3209: checking whether clobbering cr0 causes problems" >&5
echo "configure:3231: checking whether clobbering cr0 causes problems" >&5
if eval "test \"`echo '$''{'libc_cv_c_asmcr0_bug'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.$ac_ext <<EOF
#line 3214 "configure"
#line 3236 "configure"
#include "confdefs.h"
int tester(int x) { asm ("" : : : "cc"); return x & 123; }
int main() {
; return 0; }
EOF
if { (eval echo configure:3221: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
if { (eval echo configure:3243: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
rm -rf conftest*
libc_cv_c_asmcr0_bug='no'
else
@ -3239,12 +3261,12 @@ fi
fi
echo $ac_n "checking for DWARF2 unwind info support""... $ac_c" 1>&6
echo "configure:3243: checking for DWARF2 unwind info support" >&5
echo "configure:3265: checking for DWARF2 unwind info support" >&5
if eval "test \"`echo '$''{'libc_cv_gcc_dwarf2_unwind_info'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.c <<EOF
#line 3248 "configure"
#line 3270 "configure"
static char __EH_FRAME_BEGIN__;
_start ()
{
@ -3271,7 +3293,7 @@ __bzero () {}
EOF
if { ac_try='${CC-cc} $CFLAGS -DCHECK__register_frame_info
-nostdlib -nostartfiles
-o conftest conftest.c -lgcc >&5'; { (eval echo configure:3275: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
-o conftest conftest.c -lgcc >&5'; { (eval echo configure:3297: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
libc_cv_gcc_dwarf2_unwind_info=static
else
libc_cv_gcc_dwarf2_unwind_info=no
@ -3279,7 +3301,7 @@ fi
if test $libc_cv_gcc_dwarf2_unwind_info = no; then
if { ac_try='${CC-cc} $CFLAGS -DCHECK__register_frame
-nostdlib -nostartfiles
-o conftest conftest.c -lgcc >&5'; { (eval echo configure:3283: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
-o conftest conftest.c -lgcc >&5'; { (eval echo configure:3305: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
libc_cv_gcc_dwarf2_unwind_info=yes
else
libc_cv_gcc_dwarf2_unwind_info=no
@ -3309,12 +3331,12 @@ EOF
esac
echo $ac_n "checking for __builtin_expect""... $ac_c" 1>&6
echo "configure:3313: checking for __builtin_expect" >&5
echo "configure:3335: checking for __builtin_expect" >&5
if eval "test \"`echo '$''{'libc_cv_gcc_builtin_expect'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.c <<EOF
#line 3318 "configure"
#line 3340 "configure"
int foo (int a)
{
a = __builtin_expect (a, 10);
@ -3322,7 +3344,7 @@ int foo (int a)
}
EOF
if { ac_try='${CC-cc} $CFLAGS -nostdlib -nostartfiles
-o conftest conftest.c -lgcc >&5'; { (eval echo configure:3326: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
-o conftest conftest.c -lgcc >&5'; { (eval echo configure:3348: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
libc_cv_gcc_builtin_expect=yes
else
libc_cv_gcc_builtin_expect=no
@ -3339,12 +3361,12 @@ EOF
fi
echo $ac_n "checking for local label subtraction""... $ac_c" 1>&6
echo "configure:3343: checking for local label subtraction" >&5
echo "configure:3365: checking for local label subtraction" >&5
if eval "test \"`echo '$''{'libc_cv_gcc_subtract_local_labels'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.c <<EOF
#line 3348 "configure"
#line 3370 "configure"
int foo (int a)
{
static const int ar[] = { &&l1 - &&l1, &&l2 - &&l1 };
@ -3357,7 +3379,7 @@ int foo (int a)
}
EOF
if { ac_try='${CC-cc} $CFLAGS -nostdlib -nostartfiles
-o conftest conftest.c -lgcc >&5'; { (eval echo configure:3361: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
-o conftest conftest.c -lgcc >&5'; { (eval echo configure:3383: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }; then
libc_cv_gcc_subtract_local_labels=yes
else
libc_cv_gcc_subtract_local_labels=no
@ -3374,7 +3396,7 @@ EOF
fi
echo $ac_n "checking for libgd""... $ac_c" 1>&6
echo "configure:3378: checking for libgd" >&5
echo "configure:3400: checking for libgd" >&5
if test "$with_gd" != "no"; then
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $libgd_include"
@ -3383,14 +3405,14 @@ if test "$with_gd" != "no"; then
old_LIBS="$LIBS"
LIBS="$LIBS -lgd -lpng -lz -lm"
cat > conftest.$ac_ext <<EOF
#line 3387 "configure"
#line 3409 "configure"
#include "confdefs.h"
#include <gd.h>
int main() {
gdImagePng (0, 0)
; return 0; }
EOF
if { (eval echo configure:3394: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
if { (eval echo configure:3416: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
rm -rf conftest*
LIBGD=yes
else
@ -3410,7 +3432,7 @@ echo "$ac_t""$LIBGD" 1>&6
echo $ac_n "checking size of long double""... $ac_c" 1>&6
echo "configure:3414: checking size of long double" >&5
echo "configure:3436: checking size of long double" >&5
if eval "test \"`echo '$''{'ac_cv_sizeof_long_double'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
@ -3418,18 +3440,18 @@ else
ac_cv_sizeof_long_double=0
else
cat > conftest.$ac_ext <<EOF
#line 3422 "configure"
#line 3444 "configure"
#include "confdefs.h"
#include <stdio.h>
main()
int main()
{
FILE *f=fopen("conftestval", "w");
if (!f) exit(1);
if (!f) return(1);
fprintf(f, "%d\n", sizeof(long double));
exit(0);
return(0);
}
EOF
if { (eval echo configure:3433: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
if { (eval echo configure:3455: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
then
ac_cv_sizeof_long_double=`cat conftestval`
else
@ -3498,7 +3520,7 @@ if test "$uname" = "sysdeps/generic"; then
fi
echo $ac_n "checking OS release for uname""... $ac_c" 1>&6
echo "configure:3502: checking OS release for uname" >&5
echo "configure:3524: checking OS release for uname" >&5
if eval "test \"`echo '$''{'libc_cv_uname_release'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
@ -3520,7 +3542,7 @@ echo "$ac_t""$libc_cv_uname_release" 1>&6
uname_release="$libc_cv_uname_release"
echo $ac_n "checking OS version for uname""... $ac_c" 1>&6
echo "configure:3524: checking OS version for uname" >&5
echo "configure:3546: checking OS version for uname" >&5
if eval "test \"`echo '$''{'libc_cv_uname_version'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
@ -3542,7 +3564,7 @@ else
fi
echo $ac_n "checking stdio selection""... $ac_c" 1>&6
echo "configure:3546: checking stdio selection" >&5
echo "configure:3568: checking stdio selection" >&5
case $stdio in
libio) cat >> confdefs.h <<\EOF
@ -3556,7 +3578,7 @@ echo "$ac_t""$stdio" 1>&6
# Test for old glibc 2.0.x headers so that they can be removed properly
# Search only in includedir.
echo $ac_n "checking for old glibc 2.0.x headers""... $ac_c" 1>&6
echo "configure:3560: checking for old glibc 2.0.x headers" >&5
echo "configure:3582: checking for old glibc 2.0.x headers" >&5
if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
then
old_glibc_headers=yes
@ -3617,7 +3639,7 @@ if test $shared = default; then
fi
echo $ac_n "checking whether -fPIC is default""... $ac_c" 1>&6
echo "configure:3621: checking whether -fPIC is default" >&5
echo "configure:3643: checking whether -fPIC is default" >&5
if eval "test \"`echo '$''{'pic_default'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else

View File

@ -1061,6 +1061,24 @@ EOF
fi
rm -f conftest*])
AC_SUBST(libc_cv_Bgroup)
AC_CACHE_CHECK(for -z combreloc,
libc_cv_z_combreloc, [dnl
cat > conftest.c <<EOF
int foo (void) { return 0; }
EOF
if AC_TRY_COMMAND([${CC-cc} -shared -o conftest.so conftest.c -Wl,-z,combreloc 1>&AC_FD_CC])
then
dnl The following test is a bit weak. We must use a tool which can test
dnl cross-platform since the gcc used can be a cross compiler. Without
dnl introducing new options this is not easily doable. Instead use a tool
dnl which always is cross-platform: readelf. To detect whether -z combreloc
dnl look for a section named .rel.dyn.
if readelf -S conftest.so | fgrep .rel.dyn > /dev/null; then
AC_DEFINE(HAVE_Z_COMBRELOC)
fi
fi
rm -f conftest*])
fi
if test $elf != yes; then

View File

@ -305,6 +305,7 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
{
const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
if (__builtin_expect (r_type == R_386_RELATIVE, 0))
{
# ifndef RTLD_BOOTSTRAP
@ -324,6 +325,7 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
return;
# endif
else
#endif
{
#ifndef RTLD_BOOTSTRAP
const Elf32_Sym *const refsym = sym;
@ -352,7 +354,7 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
break;
if (__builtin_expect (sym->st_size > refsym->st_size, 0)
|| (__builtin_expect (sym->st_size < refsym->st_size, 0)
&& __builtin_expect (_dl_verbose, 0)))
&& _dl_verbose))
{
const char *strtab;
@ -365,8 +367,6 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
refsym->st_size));
break;
#endif
#if !defined RTLD_BOOTSTRAP || defined _NDEBUG
default:
/* We add these checks in the version to relocate ld.so only
if we are still debugging. */
@ -381,6 +381,7 @@ static inline void
elf_machine_rel_relative (Elf32_Addr l_addr, const Elf32_Rel *reloc,
Elf32_Addr *const reloc_addr)
{
assert (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE);
*reloc_addr += l_addr;
}