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From: Will Deacon <will@kernel.org>
To: Julien Thierry <jthierry@redhat.com>
Cc: linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, jpoimboe@redhat.com,
	peterz@infradead.org, raphael.gault@arm.com,
	catalin.marinas@arm.com
Subject: Re: [RFC v5 00/57] objtool: Add support for arm64
Date: Tue, 21 Jan 2020 10:30:26 +0000	[thread overview]
Message-ID: <20200121103025.GC11154@willie-the-truck> (raw)
In-Reply-To: <20200109160300.26150-1-jthierry@redhat.com>

On Thu, Jan 09, 2020 at 04:02:03PM +0000, Julien Thierry wrote:
> This patch series is the continuation of Raphael's work [1]. All the
> patches can be retrieved from:
> git clone -b arm64-objtool-v5 https://github.com/julien-thierry/linux.git

[...]

>   objtool: arm64: Decode unknown instructions
>   objtool: arm64: Decode simple data processing instructions
>   objtool: arm64: Decode add/sub immediate instructions
>   objtool: arm64: Decode logical data processing instructions
>   objtool: arm64: Decode system instructions not affecting the flow
>   objtool: arm64: Decode calls to higher EL
>   objtool: arm64: Decode brk instruction
>   objtool: arm64: Decode instruction triggering context switch
>   objtool: arm64: Decode branch instructions with PC relative immediates
>   objtool: arm64: Decode branch to register instruction
>   objtool: arm64: Decode basic load/stores
>   objtool: arm64: Decode load/store with register offset
>   objtool: arm64: Decode load/store register pair instructions
>   objtool: arm64: Decode FP/SIMD load/store instructions
>   objtool: arm64: Decode load/store exclusive
>   objtool: arm64: Decode atomic load/store
>   objtool: arm64: Decode pointer auth load instructions
>   objtool: arm64: Decode load acquire/store release
>   objtool: arm64: Decode load/store with memory tag
>   objtool: arm64: Decode load literal
>   objtool: arm64: Decode register data processing instructions
>   objtool: arm64: Decode FP/SIMD data processing instructions
>   objtool: arm64: Decode SVE instructions

That's a lot of decoding logic which we already have in
arch/arm64/{kernel/insn.c,include/asm/insn.h}. I'd prefer to see this stuff
reused or generated from a single source, since it's really easy to get it
wrong, has a tendency to bitrot and is nasty to debug.

Will

  parent reply	other threads:[~2020-01-21 10:30 UTC|newest]

Thread overview: 91+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-09 16:02 [RFC v5 00/57] objtool: Add support for arm64 Julien Thierry
2020-01-09 16:02 ` [RFC v5 01/57] objtool: check: Remove redundant checks on operand type Julien Thierry
2020-01-09 16:02 ` [RFC v5 02/57] objtool: check: Clean instruction state before each function validation Julien Thierry
2020-01-09 16:02 ` [RFC v5 03/57] objtool: check: Use arch specific values in restore_reg() Julien Thierry
2020-01-09 16:02 ` [RFC v5 04/57] objtool: check: Ignore empty alternative groups Julien Thierry
2020-01-21 16:30   ` Josh Poimboeuf
2020-01-23 11:45     ` Julien Thierry
2020-01-09 16:02 ` [RFC v5 05/57] objtool: Add abstraction for computation of symbols offsets Julien Thierry
2020-01-09 16:02 ` [RFC v5 06/57] objtool: Give ORC functions consistent name Julien Thierry
2020-01-09 16:02 ` [RFC v5 07/57] objtool: orc: Refactor ORC API for other architectures to implement Julien Thierry
2020-01-09 16:02 ` [RFC v5 08/57] objtool: Make ORC support optional Julien Thierry
2020-01-21 16:37   ` Josh Poimboeuf
2020-01-23 11:45     ` Julien Thierry
2020-01-09 16:02 ` [RFC v5 09/57] objtool: Move registers and control flow to arch-dependent code Julien Thierry
2020-01-09 16:02 ` [RFC v5 10/57] objtool: Split generic and arch specific CFI definitions Julien Thierry
2020-01-09 16:02 ` [RFC v5 11/57] objtool: Abstract alternative special case handling Julien Thierry
2020-01-20 14:54   ` Peter Zijlstra
2020-01-23 11:45     ` Julien Thierry
2020-01-09 16:02 ` [RFC v5 12/57] objtool: check: Allow jumps from an alternative group to itself Julien Thierry
2020-01-20 14:56   ` Peter Zijlstra
2020-01-21 10:30     ` Will Deacon
2020-01-21 17:33   ` Josh Poimboeuf
2020-01-23 13:42     ` Julien Thierry
2020-01-09 16:02 ` [RFC v5 13/57] objtool: Refactor switch-tables code to support other architectures Julien Thierry
2020-01-09 16:02 ` [RFC v5 14/57] objtool: Do not look for STT_NOTYPE symbols Julien Thierry
2020-01-13 10:20   ` Julien Thierry
2020-01-09 16:02 ` [RFC v5 15/57] objtool: Support addition to set frame pointer Julien Thierry
2020-01-09 16:02 ` [RFC v5 16/57] objtool: Support restoring BP from the stack without POP Julien Thierry
2020-01-09 16:02 ` [RFC v5 17/57] objtool: Make stack validation more generic Julien Thierry
2020-01-09 16:02 ` [RFC v5 18/57] objtool: Support multiple stack_op per instruction Julien Thierry
2020-01-09 16:02 ` [RFC v5 19/57] objtool: arm64: Add required implementation for supporting the aarch64 architecture in objtool Julien Thierry
2020-01-09 16:02 ` [RFC v5 20/57] objtool: arm64: Decode unknown instructions Julien Thierry
2020-01-09 16:02 ` [RFC v5 21/57] objtool: arm64: Decode simple data processing instructions Julien Thierry
2020-01-09 16:02 ` [RFC v5 22/57] objtool: arm64: Decode add/sub immediate instructions Julien Thierry
2020-01-09 16:02 ` [RFC v5 23/57] objtool: arm64: Decode logical data processing instructions Julien Thierry
2020-01-09 16:02 ` [RFC v5 24/57] objtool: arm64: Decode system instructions not affecting the flow Julien Thierry
2020-01-09 16:02 ` [RFC v5 25/57] objtool: arm64: Decode calls to higher EL Julien Thierry
2020-01-09 16:02 ` [RFC v5 26/57] objtool: arm64: Decode brk instruction Julien Thierry
2020-01-09 16:02 ` [RFC v5 27/57] objtool: arm64: Decode instruction triggering context switch Julien Thierry
2020-01-09 16:02 ` [RFC v5 28/57] objtool: arm64: Decode branch instructions with PC relative immediates Julien Thierry
2020-01-09 16:02 ` [RFC v5 29/57] objtool: arm64: Decode branch to register instruction Julien Thierry
2020-01-09 16:02 ` [RFC v5 30/57] objtool: arm64: Decode basic load/stores Julien Thierry
2020-01-09 16:02 ` [RFC v5 31/57] objtool: arm64: Decode load/store with register offset Julien Thierry
2020-01-09 16:02 ` [RFC v5 32/57] objtool: arm64: Decode load/store register pair instructions Julien Thierry
2020-01-09 16:02 ` [RFC v5 33/57] objtool: arm64: Decode FP/SIMD load/store instructions Julien Thierry
2020-01-09 16:02 ` [RFC v5 34/57] objtool: arm64: Decode load/store exclusive Julien Thierry
2020-01-09 16:02 ` [RFC v5 35/57] objtool: arm64: Decode atomic load/store Julien Thierry
2020-01-09 16:02 ` [RFC v5 36/57] objtool: arm64: Decode pointer auth load instructions Julien Thierry
2020-01-09 16:02 ` [RFC v5 37/57] objtool: arm64: Decode load acquire/store release Julien Thierry
2020-01-09 16:02 ` [RFC v5 38/57] objtool: arm64: Decode load/store with memory tag Julien Thierry
2020-01-09 16:02 ` [RFC v5 39/57] objtool: arm64: Decode load literal Julien Thierry
2020-01-09 16:02 ` [RFC v5 40/57] objtool: arm64: Decode register data processing instructions Julien Thierry
2020-01-09 16:02 ` [RFC v5 41/57] objtool: arm64: Decode FP/SIMD " Julien Thierry
2020-01-09 16:02 ` [RFC v5 42/57] objtool: arm64: Decode SVE instructions Julien Thierry
2020-01-09 16:02 ` [RFC v5 43/57] gcc-plugins: objtool: Add plugin to detect switch table on arm64 Julien Thierry
2020-01-09 16:02 ` [RFC v5 44/57] objtool: arm64: Implement functions to add switch tables alternatives Julien Thierry
2020-01-15 16:37   ` Raphael Gault
2020-01-17  8:28     ` Julien Thierry
2020-01-09 16:02 ` [RFC v5 45/57] objtool: arm64: Enable stack validation for arm64 Julien Thierry
2020-01-09 16:02 ` [RFC v5 46/57] arm64: alternative: Mark .altinstr_replacement as containing executable instructions Julien Thierry
2020-01-09 16:02 ` [RFC v5 47/57] arm64: assembler: Add macro to annotate asm function having non standard stack-frame Julien Thierry
2020-01-21 10:30   ` Will Deacon
2020-01-23 13:45     ` Julien Thierry
2020-01-23 14:40       ` Will Deacon
2020-01-09 16:02 ` [RFC v5 48/57] arm64: sleep: Prevent stack frame warnings from objtool Julien Thierry
2020-01-09 16:02 ` [RFC v5 49/57] arm64: kvm: Annotate non-standard stack frame functions Julien Thierry
2020-01-09 16:02 ` [RFC v5 50/57] arm64: kernel: Add exception on kuser32 to prevent stack analysis Julien Thierry
2020-01-09 16:02 ` [RFC v5 51/57] arm64: crypto: Add exceptions for crypto object " Julien Thierry
2020-01-09 16:02 ` [RFC v5 52/57] arm64: kernel: Annotate non-standard stack frame functions Julien Thierry
2020-01-09 16:02 ` [RFC v5 53/57] arm64: Generate no-ops to pad executable section Julien Thierry
2020-01-09 16:02 ` [RFC v5 54/57] arm64: Move constant to rodata Julien Thierry
2020-01-09 16:02 ` [RFC v5 55/57] arm64: Mark sigreturn32.o as containing non standard code Julien Thierry
2020-01-09 16:02 ` [RFC v5 56/57] arm64: entry: Avoid empty alternatives entries Julien Thierry
2020-01-09 16:51   ` Mark Rutland
2020-01-21 10:30     ` Will Deacon
2020-01-09 16:03 ` [RFC v5 57/57] arm64: crypto: Remove redundant branch Julien Thierry
2020-01-12  8:42 ` [RFC v5 00/57] objtool: Add support for arm64 Nathan Chancellor
2020-01-13  7:57   ` Julien Thierry
2020-01-21 10:31     ` Will Deacon
2020-01-21 17:08       ` Nick Desaulniers
2020-01-21 18:06         ` Will Deacon
2020-01-21 18:30           ` Josh Poimboeuf
2020-01-22 14:47             ` Will Deacon
2020-01-13 17:18   ` Nick Desaulniers
2020-01-20 15:07 ` Peter Zijlstra
2020-01-21 17:50   ` Josh Poimboeuf
2020-01-23 13:56     ` Julien Thierry
2020-01-21 10:30 ` Will Deacon [this message]
2020-01-23 13:52   ` Julien Thierry
2020-01-23 14:35     ` Will Deacon
2020-01-23 15:11       ` Julien Thierry

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