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author | Jussi Kivilinna <jussi.kivilinna@iki.fi> | 2014-01-12 10:53:47 +0200 |
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committer | Jussi Kivilinna <jussi.kivilinna@iki.fi> | 2014-01-12 10:53:47 +0200 |
commit | 43376891c01f4aff1fbfb23beafebb5adfd0868c (patch) | |
tree | 95ec6ce81c540c210cd7acf0acc3df591b552ccf /configure.ac | |
parent | b0ac1f9b143aa15855914ba93fef900288d45c9c (diff) | |
download | libgcrypt-43376891c01f4aff1fbfb23beafebb5adfd0868c.tar.gz |
Fix constant division for AMD64 assembly on Solaris/x86
* configure.ac (gcry_cv_gcc_as_const_division_ok): Add new check for
constant division in assembly and test for "-Wa,--divide" workaround.
(gcry_cv_gcc_amd64_platform_as_ok): Check for also constant division.
--
Appearantly on Solaris/x86 '/' character is treated as begining of line
comment by GNU as. This causes problems when compiling SHA-1 SSSE3
implementation:
On 02.01.2014 16:26, Richard PALO wrote:
>> COLLECT_GCC_OPTIONS='-D' 'HAVE_CONFIG_H' '-I' '.' '-I' '..' '-I' '../src' '-I' '/var/tmp/pkgsrc/security/libgcrypt/work/.buildlink/include' '-I' '/var/tmp/pkgsrc/security/libgcrypt/work/.buildlink/include/gettext' '-D' '_REENTRANT' '-O2' '-MT' 'sha1-ssse3-amd64.lo' '-MD' '-MP' '-MF' '.deps/sha1-ssse3-amd64.Tpo' '-c' '-fPIC' '-D' 'PIC' '-o' '.libs/sha1-ssse3-amd64.o' '-v' '-mtune=generic' '-march=x86-64'
>> /usr/gnu/bin/as -v -I . -I .. -I ../src -I /var/tmp/pkgsrc/security/libgcrypt/work/.buildlink/include -I /var/tmp/pkgsrc/security/libgcrypt/work/.buildlink/include/gettext -V -Qy -s --64 -o .libs/sha1-ssse3-amd64.o /var/tmp//ccAxWPXX.s
>> GNU assembler version 2.23.1 (i386-pc-solaris2.11) using BFD version (GNU Binutils) 2.23.1
>> /var/tmp//ccAxWPXX.s: Assembler messages:
>> /var/tmp//ccAxWPXX.s:34: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:38: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:42: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:46: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:54: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:58: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:62: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:66: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:70: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:74: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:78: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:82: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:86: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:90: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:94: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:98: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:102: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:106: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:110: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:114: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:119: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:123: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:127: Error: unbalanced parenthesis in operand 1.
>> /var/tmp//ccAxWPXX.s:132: Error: unbalanced parenthesis in operand 1.
>
>
> apparently the paddd code, such as
> `paddd (.LK_XMM + ((i)/20)*16) RIP, tmp0;`
> isn't digested well, appended is the generated assembler code.
On 02.01.2014 17:41, Richard PALO wrote:
> Hi again, after finding the following:
> https://sourceware.org/bugzilla/show_bug.cgi?id=4572
>
> I tried using '-Wa,--divide' and that seemed to workaround the problem...
>
> perhaps the code, or at least the Makefile could be adapted accordingly?
Patch adds detection of this feature and attempts to workaround issue with by
adding "-Wa,--divide" to CPPFLAGS. If workaround does not work (old GAS on
Solaris/x86), we'll disable AMD64 assembly.
[v3]:
- Update CPPFLAGS after testing instead of CFLAGS.
Reported-and-tested-by: Richard PALO <richard.palo@free.fr>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Diffstat (limited to 'configure.ac')
-rw-r--r-- | configure.ac | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 05cdaf8e..fac5f7a0 100644 --- a/configure.ac +++ b/configure.ac @@ -1079,11 +1079,42 @@ fi # +# Check whether GCC assembler needs "-Wa,--divide" to correctly handle +# constant division +# +if test $amd64_as_feature_detection = yes; then + AC_CACHE_CHECK([whether GCC assembler handles division correctly], + [gcry_cv_gcc_as_const_division_ok], + [gcry_cv_gcc_as_const_division_ok=no + AC_COMPILE_IFELSE([AC_LANG_SOURCE( + [[__asm__("xorl \$(123456789/12345678), %ebp;\n\t");]])], + [gcry_cv_gcc_as_const_division_ok=yes])]) + if test "$gcry_cv_gcc_as_const_division_ok" = "no" ; then + # + # Add '-Wa,--divide' to CPPFLAGS and try check again. + # + _gcc_cppflags_save="$CPPFLAGS" + CPPFLAGS="$CPPFLAGS -Wa,--divide" + AC_CACHE_CHECK([whether GCC assembler handles division correctly with "-Wa,--divide"], + [gcry_cv_gcc_as_const_division_with_wadivide_ok], + [gcry_cv_gcc_as_const_division_with_wadivide_ok=no + AC_COMPILE_IFELSE([AC_LANG_SOURCE( + [[__asm__("xorl \$(123456789/12345678), %ebp;\n\t");]])], + [gcry_cv_gcc_as_const_division_with_wadivide_ok=yes])]) + if test "$gcry_cv_gcc_as_const_division_ok_with_wadivide_ok" = "no" ; then + # '-Wa,--divide' did not work, restore old flags. + CPPFLAGS="$_gcc_cppflags_save" + fi + fi +fi + + +# # Check whether GCC assembler supports features needed for our amd64 # implementations # if test $amd64_as_feature_detection = yes; then - AC_CACHE_CHECK([whether GCC assembler is compatible for amd64 assembly implementations], + AC_CACHE_CHECK([whether GCC assembler is compatible for amd64 assembly implementations], [gcry_cv_gcc_amd64_platform_as_ok], [gcry_cv_gcc_amd64_platform_as_ok=no AC_COMPILE_IFELSE([AC_LANG_SOURCE( @@ -1096,6 +1127,11 @@ if test $amd64_as_feature_detection = yes; then "asmfunc:\n\t" ".size asmfunc,.-asmfunc;\n\t" ".type asmfunc,@function;\n\t" + /* Test if assembler allows use of '/' for constant division + * (Solaris/x86 issue). If previous constant division check + * and "-Wa,--divide" workaround failed, this causes assembly + * to be disable on this machine. */ + "xorl \$(123456789/12345678), %ebp;\n\t" );]])], [gcry_cv_gcc_amd64_platform_as_ok=yes])]) if test "$gcry_cv_gcc_amd64_platform_as_ok" = "yes" ; then |