From: Mark Brown <broonie@kernel.org>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Eric Biggers <ebiggers@google.com>,
linux-arm-kernel@lists.infradead.org,
linux-crypto@vger.kernel.org
Subject: Re: [PATCH 0/3] arm64: Open code .arch_extension
Date: Wed, 25 Mar 2020 11:50:38 +0000 [thread overview]
Message-ID: <20200325115038.GD4346@sirena.org.uk> (raw)
In-Reply-To: <CAMj1kXH=g5N4ZtnZeX5N8hf9cnWVam4Htnov6qAmQwD58Wp73Q@mail.gmail.com>
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On Wed, Mar 25, 2020 at 12:45:11PM +0100, Ard Biesheuvel wrote:
> I don't think this is the right fix. What is wrong with keeping these
> .cpu and .arch directives in the .S files, and simply make
> SYM_FUNC_START() expand to something that includes .arch_extension pac
> or .arch_extension bti when needed? That way, we only use
> .arch_extension when we know the assembler supports it (given that
> .arch_extension support itself should predate BTI or PAC support in
> GAS or Clang)
Since BTI is a mandatory feature of v8.5 there is no BTI arch_extension,
you can only enable it by moving the base architecture to v8.5. You'd
need to use .arch and that feels likely to find us sharp edges to run
into.
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next prev parent reply other threads:[~2020-03-25 11:50 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-25 11:41 [PATCH 0/3] arm64: Open code .arch_extension Mark Brown
2020-03-25 11:41 ` [PATCH 1/3] arm64: asm: Provide macro to control enabling architecture extensions Mark Brown
2020-03-25 11:41 ` [PATCH 2/3] arm64: lib: Use ARM64_EXTENSIONS() Mark Brown
2020-03-25 11:41 ` [PATCH 3/3] arm64: crypto: " Mark Brown
2020-03-25 11:45 ` [PATCH 0/3] arm64: Open code .arch_extension Ard Biesheuvel
2020-03-25 11:50 ` Mark Brown [this message]
2020-03-25 11:54 ` Ard Biesheuvel
2020-03-25 12:01 ` Mark Brown
2020-03-25 12:03 ` Mark Rutland
2020-03-25 12:24 ` Robin Murphy
2020-04-22 18:00 ` Catalin Marinas
2020-04-23 11:18 ` Mark Brown
2020-04-23 11:59 ` Catalin Marinas
2020-04-23 13:40 ` Catalin Marinas
2020-03-25 12:31 ` Mark Rutland
2020-03-25 13:26 ` Ard Biesheuvel
2020-03-25 13:30 ` Mark Brown
2020-03-25 13:27 ` Mark Brown
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