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| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2020-03-26 17:00:58 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2020-04-09 00:01:59 +0900 |
| commit | 5e8ebd841a44b895e2bab5e874ff7d333ca31135 (patch) | |
| tree | 29052fdeb3e882b87e78ffb83e08c1edd7125bdb /arch | |
| parent | 8192e551c7e6e0628597cb5648e1c2f23a8ad294 (diff) | |
| download | linux-stable-5e8ebd841a44b895e2bab5e874ff7d333ca31135.tar.gz linux-stable-5e8ebd841a44b895e2bab5e874ff7d333ca31135.tar.bz2 linux-stable-5e8ebd841a44b895e2bab5e874ff7d333ca31135.zip | |
x86: probe assembler capabilities via kconfig instead of makefile
Doing this probing inside of the Makefiles means we have a maze of
ifdefs inside the source code and child Makefiles that need to make
proper decisions on this too. Instead, we do it at Kconfig time, like
many other compiler and assembler options, which allows us to set up the
dependencies normally for full compilation units. In the process, the
ADX test changes to use %eax instead of %r10 so that it's valid in both
32-bit and 64-bit mode.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/Kconfig | 2 | ||||
| -rw-r--r-- | arch/x86/Kconfig.assembler | 17 | ||||
| -rw-r--r-- | arch/x86/Makefile | 10 |
3 files changed, 19 insertions, 10 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 8d078642b4be..70898a68fa1a 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2931,3 +2931,5 @@ config HAVE_ATOMIC_IOMAP source "drivers/firmware/Kconfig" source "arch/x86/kvm/Kconfig" + +source "arch/x86/Kconfig.assembler" diff --git a/arch/x86/Kconfig.assembler b/arch/x86/Kconfig.assembler new file mode 100644 index 000000000000..91230bf11a14 --- /dev/null +++ b/arch/x86/Kconfig.assembler @@ -0,0 +1,17 @@ +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. + +config AS_AVX2 + def_bool $(as-instr,vpbroadcastb %xmm0$(comma)%ymm1) + +config AS_AVX512 + def_bool $(as-instr,vpmovm2b %k1$(comma)%zmm5) + +config AS_SHA1_NI + def_bool $(as-instr,sha1msg1 %xmm0$(comma)%xmm1) + +config AS_SHA256_NI + def_bool $(as-instr,sha256msg1 %xmm0$(comma)%xmm1) + +config AS_ADX + def_bool $(as-instr,adox %eax$(comma)%eax) diff --git a/arch/x86/Makefile b/arch/x86/Makefile index f32ef7b8d5ca..b65ec63c7db7 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -177,16 +177,6 @@ ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1) KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,) endif -# does binutils support specific instructions? -avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1) -avx512_instr :=$(call as-instr,vpmovm2b %k1$(comma)%zmm5,-DCONFIG_AS_AVX512=1) -sha1_ni_instr :=$(call as-instr,sha1msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA1_NI=1) -sha256_ni_instr :=$(call as-instr,sha256msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA256_NI=1) -adx_instr := $(call as-instr,adox %r10$(comma)%r10,-DCONFIG_AS_ADX=1) - -KBUILD_AFLAGS += $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr) $(adx_instr) -KBUILD_CFLAGS += $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr) $(adx_instr) - KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE) # |