From: Andy Chiu Date: Mon, 5 Jun 2023 11:07:20 +0000 (+0000) Subject: riscv: detect assembler support for .option arch X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e4bb020f3dbb83912eb6799a9d4bb79da4fd77ec;p=linux.git riscv: detect assembler support for .option arch 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 Signed-off-by: Andy Chiu Reviewed-by: Conor Dooley Reviewed-by: Nathan Chancellor Reviewed-by: Heiko Stuebner Tested-by: Heiko Stuebner Link: https://lore.kernel.org/r/20230605110724.21391-24-andy.chiu@sifive.com Signed-off-by: Palmer Dabbelt --- diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 348c0fa1fc8c7..1019b519d590e 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -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"