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riscv: detect assembler support for .option arch

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Some extensions use .option arch directive to selectively enable certain
extensions in parts of its assembly code. For example, Zbb uses it to
inform assmebler to emit bit manipulation instructions. However,
supporting of this directive only exist on GNU assembler and has not
landed on clang at the moment, making TOOLCHAIN_HAS_ZBB depend on
AS_IS_GNU.

While it is still under review at https://reviews.llvm.org/D123515, the
upcoming Vector patch also requires this feature in assembler. Thus,
provide Kconfig AS_HAS_OPTION_ARCH to detect such feature. Then
TOOLCHAIN_HAS_XXX will be turned on automatically when the feature land.

Suggested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Tested-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Link: https://lore.kernel.org/r/20230605110724.21391-24-andy.chiu@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Andy Chiu 2023-06-05 11:07:20 +00:00 committed by Palmer Dabbelt
parent 7ca7a7b9b6
commit e4bb020f3d
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1 changed files with 7 additions and 1 deletions
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8
arch/riscv/Kconfig
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@ -262,6 +262,12 @@ config RISCV_DMA_NONCOHERENT
config AS_HAS_INSN
def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero)
config AS_HAS_OPTION_ARCH
# https://reviews.llvm.org/D123515
def_bool y
depends on $(as-instr, .option arch$(comma) +m)
depends on !$(as-instr, .option arch$(comma) -i)
source "arch/riscv/Kconfig.socs"
source "arch/riscv/Kconfig.errata"
@ -466,7 +472,7 @@ config TOOLCHAIN_HAS_ZBB
depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbb)
depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbb)
depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
depends on AS_IS_GNU
depends on AS_HAS_OPTION_ARCH
config RISCV_ISA_ZBB
bool "Zbb extension support for bit manipulation instructions"