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author | Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> | 2020-07-10 19:41:06 -0300 |
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committer | Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> | 2020-07-10 19:41:06 -0300 |
commit | 7c7bcf3634e44cf7e001aaa302138c1ee0e58f8c (patch) | |
tree | efc90e1b49ce51b1ec962f034ca6ba872ad3c6c7 /sysdeps/powerpc/powerpc64/configure.ac | |
parent | 936c9666aed6747f7a76221118f7cf59100075e6 (diff) | |
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powerpc64: Fix calls when r2 is not used [BZ #26173]
Teach the linker that __mcount_internal, __sigjmp_save_symbol,
__syscall_error and __GI_exit do not use r2, so that it does not need to
recover r2 after the call.
Test at configure time if the assembler supports @notoc and define
USE_PPC64_NOTOC.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/configure.ac')
-rw-r--r-- | sysdeps/powerpc/powerpc64/configure.ac | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/configure.ac b/sysdeps/powerpc/powerpc64/configure.ac index f309ba35a8..b77156f696 100644 --- a/sysdeps/powerpc/powerpc64/configure.ac +++ b/sysdeps/powerpc/powerpc64/configure.ac @@ -21,3 +21,14 @@ rm -f conftest.c conftest.s if test x$libc_cv_overlapping_opd = xyes; then AC_DEFINE(USE_PPC64_OVERLAPPING_OPD) fi + +# @notoc started to be supported in GNU Binutils 2.31. +AC_CACHE_CHECK([if the assembler supports @notoc], + libc_cv_ppc64_notoc, [ + AC_COMPILE_IFELSE([AC_LANG_SOURCE([ +void foo (void) {asm("b foo@notoc");} + ])], + [libc_cv_ppc64_notoc=yes], + [libc_cv_ppc64_notoc=no])]) +AS_IF([test x$libc_cv_ppc64_notoc = xyes], + [AC_DEFINE(USE_PPC64_NOTOC)]) |