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arm: Profile/variation detection improvements

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* Detection of 64-bit Arm v8-a
 * Proper detection of integer division support
   * always on v7-m, v8-a, v9-a, v8-m.main
   * sometimes on v7-a, v7-r, v8-r
   * never on v8-m.base v6-m, v6 and older "classic"
   * tl;dr: Rely on toolchain preprocessor definition

For the most part these additional variations won't acutally work
for native target builds, but sane -A detection is needed for
"local" builds now. -R detection is left out as it's not likely
to matter.

Change-Id: I8f6a52edc4d14490fc00e2f487406eca701eef02
This commit is contained in:
Solomon Peachy 2025-12-04 20:20:35 -05:00
parent 6d39bf5e48
commit afe128f4cc
4 changed files with 30 additions and 90 deletions
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31
tools/configure vendored
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@ -4760,11 +4760,30 @@ if [ -z "$arch" ]; then
;;
*)
# On classic ARM we expect an empty string, so only warn if it's nonempty
if [ -n "$arch_profile" ]; then
echo "Warning: Cannot determine target ARM profile, assuming classic"
if [ -z "$arch_profile" ]; then
arch_profile=classic
else
echo "Error: Unsupported target ARM profile ($arch_profile)"
exit 1
fi
arch_profile=classic
;;
esac
elif [ -n "$(echo $cpp_defines | grep -w __aarch64__)" ]; then
arch="arm64"
# cpp defines like "#define __ARM_ARCH_8A__ 1" (where we want to extract the 8)
arch_version="$(echo $cpp_defines | tr ' ' '\012' | grep __ARM_ARCH | sed -e 's,.*\([0-9]\).*,\1,' | grep -v __ARM_ARCH | head -1)"
arch_profile="$(echo "$cpp_defines" | grep 'define __ARM_ARCH_PROFILE' | sed -e 's,.* \([0-9]\+\)$,\1,')"
if test "$gccnum" -ge "800"; then
# GCC8+ can natively emit unified asm syntax
GCCOPTS="$GCCOPTS -masm-syntax-unified"
fi
case "$arch_profile" in
65) # Cortex-A
arch_profile=application
;;
*)
echo "Error: Unsupported target AARCH64 profile ($arch_profile)"
exit 1
;;
esac
elif [ -n "$(echo $cpp_defines | grep -w __mips__)" ]; then
@ -4840,8 +4859,8 @@ cat > autoconf.h.new <<EOF
#define arch_none 0
#define ARCH_NONE 0
#define arch_sh 1
#define ARCH_SH 1
#define arch_arm64 1
#define ARCH_ARM64 1
#define arch_m68k 2
#define ARCH_M68K 2