On Thu, Jul 27, 2023 at 01:45:24AM +0800, Mingzheng Xing wrote:
> Binutils-2.38 and GCC-12.1.0 bump[0] default ISA spec to newer version
> 20191213 which moves some instructions from the I extension to the
> Zicsr and Zifencei extensions. So if one of the binutils and GCC exceeds
> that version, we should turn on TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
> to cope with the new changes.
>
> The case of clang is special[1][2], where older clang versions (<17) need
> to be rolled back to old ISA spec to fix it. And the less common case,
> since older GCC versions (<11.1.0) did not support zicsr and zifencei
Can you provide a link to explain why this is 11.1.0 in particular?
> extension for -march, also requires a fallback to cope with it.
>
> For more information, please refer to:
> commit 6df2a016c0c8 ("riscv: fix build with binutils 2.38")
> commit e89c2e815e76 ("riscv: Handle zicsr/zifencei issues between clang and binutils")
> Link: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=98416dbb0a62579d4a7a4a76bab51b5b52fec2cd [0]
> Link: https://lore.kernel.org/all/20230308220842.1231003-1-conor@xxxxxxxxxx [1]
> Link: https://lore.kernel.org/all/20230223220546.52879-1-conor@xxxxxxxxxx [2]
> Link: https://lore.kernel.org/all/20230725170405.251011-1-xingmingzheng@xxxxxxxxxxx
This shouldn't be here, you don't link to your old patches.
> Signed-off-by: Mingzheng Xing <xingmingzheng@xxxxxxxxxxx>
This is still broken for:
CONFIG_CLANG_VERSION=0
CONFIG_AS_IS_GNU=y
CONFIG_AS_VERSION=23500
CONFIG_LD_IS_BFD=y
CONFIG_LD_VERSION=23500
Please don't post a v2 while there is still ongoing discussion on the
v1. I'll try to reply here tomorrow with a diff you can fold in to fix
the problem.
Thanks,
Conor.
> ---
>
> v2:
> - Update the Kconfig help text and commit message.
> - Add considerations for low version gcc case.
>
> Sorry for the formatting error on my mailing list reply.
>
> arch/riscv/Kconfig | 23 +++++++++++++----------
> 1 file changed, 13 insertions(+), 10 deletions(-)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 4c07b9189c86..08afd47de157 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -570,24 +570,27 @@ config TOOLCHAIN_HAS_ZIHINTPAUSE
> config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
> def_bool y
> # https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6dc
> - depends on AS_IS_GNU && AS_VERSION >= 23800
> + # https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=98416dbb0a62579d4a7a4a76bab51b5b52fec2cd
> + depends on GCC_VERSION >= 120100 || (AS_IS_GNU && AS_VERSION >= 23800)
> help
> - Newer binutils versions default to ISA spec version 20191213 which
> - moves some instructions from the I extension to the Zicsr and Zifencei
> - extensions.
> + Binutils-2.38 and GCC-12.1.0 bump default ISA spec to newer version
> + 20191213 which moves some instructions from the I extension to the
> + Zicsr and Zifencei extensions.
>
> config TOOLCHAIN_NEEDS_OLD_ISA_SPEC
> def_bool y
> depends on TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
> # https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16
> - depends on CC_IS_CLANG && CLANG_VERSION < 170000
> + # https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=b03be74bad08c382da47e048007a78fa3fb4ef49
> + depends on (CC_IS_CLANG && CLANG_VERSION < 170000) || \
> + (CC_IS_GCC && GCC_VERSION < 110100)
> help
> - Certain versions of clang do not support zicsr and zifencei via -march
> - but newer versions of binutils require it for the reasons noted in the
> - help text of CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI. This
> + Certain versions of clang (or GCC) do not support zicsr and zifencei via
> + -march but newer versions of binutils require it for the reasons noted
> + in the help text of CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI. This
> option causes an older ISA spec compatible with these older versions
> - of clang to be passed to GAS, which has the same result as passing zicsr
> - and zifencei to -march.
> + of clang (or GCC) to be passed to GAS, which has the same result as
> + passing zicsr and zifencei to -march.
>
> config FPU
> bool "FPU support"
> --
> 2.34.1
>
>
> _______________________________________________
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> linux-riscv@xxxxxxxxxxxxxxxxxxx
> http://lists.infradead.org/mailman/listinfo/linux-riscv
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