118 lines
3.7 KiB
Diff
118 lines
3.7 KiB
Diff
From 66d4035958e1dee2d16f9290004921674eb492b3 Mon Sep 17 00:00:00 2001
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From: Szabolcs Nagy <szabolcs.nagy@arm.com>
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Date: Mon, 4 Dec 2023 10:52:52 +0000
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Subject: [PATCH 118/157] [Backport][SME] libgcc: aarch64: Configure check for
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__getauxval
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Reference: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=dbbfb52b0e9c66ee9d05b8fd17c4f44655e48463
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Add configure check for the __getauxval ABI symbol, which is always
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available on aarch64 glibc, and may be available on other linux C
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runtimes. For now only enabled on glibc, others have to override it
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target_configargs=libgcc_cv_have___getauxval=yes
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This is deliberately obscure as it should be auto detected, ideally
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via a feature test macro in unistd.h (link time detection is not
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possible since the libc may not be installed at libgcc build time),
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but currently there is no such feature test mechanism.
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Without __getauxval, libgcc cannot do runtime CPU feature detection
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and has to assume only the build time known features are available.
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libgcc/ChangeLog:
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* config.in: Undef HAVE___GETAUXVAL.
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* configure: Regenerate.
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* configure.ac: Check for __getauxval.
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---
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libgcc/config.in | 3 +++
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libgcc/configure | 26 ++++++++++++++++++++++++++
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libgcc/configure.ac | 19 +++++++++++++++++++
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3 files changed, 48 insertions(+)
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diff --git a/libgcc/config.in b/libgcc/config.in
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index 5dd96cdf6..441d4d39b 100644
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--- a/libgcc/config.in
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+++ b/libgcc/config.in
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@@ -16,6 +16,9 @@
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/* Define to 1 if the assembler supports .variant_pcs. */
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#undef HAVE_AS_VARIANT_PCS
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+/* Define to 1 if __getauxval is available. */
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+#undef HAVE___GETAUXVAL
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+
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/* Define to 1 if the target assembler supports thread-local storage. */
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#undef HAVE_CC_TLS
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diff --git a/libgcc/configure b/libgcc/configure
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index afe02b303..a874ef57e 100755
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--- a/libgcc/configure
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+++ b/libgcc/configure
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@@ -5658,6 +5658,32 @@ $as_echo "#define HAVE_AS_VARIANT_PCS 1" >>confdefs.h
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;;
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esac
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+# Check __getauxval ABI symbol for CPU feature detection.
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+case ${target} in
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+aarch64*-linux-*)
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+ # No link check because the libc may not be present.
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+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for __getauxval" >&5
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+$as_echo_n "checking for __getauxval... " >&6; }
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+if ${libgcc_cv_have___getauxval+:} false; then :
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+ $as_echo_n "(cached) " >&6
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+else
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+ case ${target} in
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+ *-linux-gnu*)
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+ libgcc_cv_have___getauxval=yes
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+ ;;
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+ *)
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+ libgcc_cv_have___getauxval=no
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+ esac
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+fi
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgcc_cv_have___getauxval" >&5
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+$as_echo "$libgcc_cv_have___getauxval" >&6; }
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+ if test x$libgcc_cv_have___getauxval = xyes; then
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+
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+$as_echo "#define HAVE___GETAUXVAL 1" >>confdefs.h
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+
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+ fi
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+esac
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+
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for init priority support" >&5
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$as_echo_n "checking for init priority support... " >&6; }
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if ${libgcc_cv_init_priority+:} false; then :
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diff --git a/libgcc/configure.ac b/libgcc/configure.ac
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index abc398c91..64b45ae14 100644
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--- a/libgcc/configure.ac
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+++ b/libgcc/configure.ac
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@@ -665,6 +665,25 @@ aarch64*-*-*)
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esac])
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LIBGCC_CHECK_AS_VARIANT_PCS
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+# Check __getauxval ABI symbol for CPU feature detection.
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+case ${target} in
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+aarch64*-linux-*)
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+ # No link check because the libc may not be present.
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+ AC_CACHE_CHECK([for __getauxval],
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+ [libgcc_cv_have___getauxval],
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+ [case ${target} in
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+ *-linux-gnu*)
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+ libgcc_cv_have___getauxval=yes
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+ ;;
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+ *)
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+ libgcc_cv_have___getauxval=no
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+ esac])
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+ if test x$libgcc_cv_have___getauxval = xyes; then
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+ AC_DEFINE(HAVE___GETAUXVAL, 1,
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+ [Define to 1 if __getauxval is available.])
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+ fi
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+esac
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+
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dnl Check if as supports RTM instructions.
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AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
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--
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2.33.0
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