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Re: [Aarch64] Support ARMv8.2 AT instructions
- From: Matthew Wahab <matthew dot wahab at foss dot arm dot com>
- To: binutils at sourceware dot org, Tristan Gingold <gingold at adacore dot com>
- Date: Mon, 14 Dec 2015 16:22:33 +0000
- Subject: Re: [Aarch64] Support ARMv8.2 AT instructions
- Authentication-results: sourceware.org; auth=none
- References: <56697079 dot 6050709 at foss dot arm dot com> <CAFqB+Py0iKBQbuOR17AD8wCb7fH+mRyxP8t20BnLOK-LpsfJYQ at mail dot gmail dot com> <566AC879 dot 6020507 at foss dot arm dot com> <CAFqB+Pw8MFWck9LduDRbs=dWtyhaQVi+imQH+s1zM-whpiKWQA at mail dot gmail dot com>
On 14/12/15 16:19, Marcus Shawcroft wrote:
On 11 December 2015 at 12:58, Matthew Wahab <firstname.lastname@example.org> wrote:
[Re-inserted the context]
I made a mistake with rebasing the ARMv8.2 AT instruction patch which
left this part
+ /* AT S1E1RP, AT S1E1WP. Values are from aarch64_sys_regs_at. */
+ if ((reg->value == CPENS (0, C7, C9, 0)
+ || reg->value == CPENS (0, C7, C9, 1))
+ && !AARCH64_CPU_HAS_FEATURE (features, AARCH64_FEATURE_V8_2))
+ return FALSE;
in aarch64_pstatefield_supported_p rather than in
aarch64_sys_ins_reg_supported_p, where it was supposed to be.
The patch adding support for id_aa64mmfr2_el1
(https://sourceware.org/ml/binutils-cvs/2015-11/msg00163.html), also had
the effect of removing a conditional branch in aarch64_sys_reg_supported_p.
The effect of both of these is to suppress an error if some ARMv8.2
system registers are used with the wrong -march settings.
This patch fixes these mistakes.
Tested for aarch64-none-linux-gnu with cross-compiled check-binutils and
2015-12-11 Matthew Wahab <email@example.com>
* aarch64-opc.c (aarch64_sys_reg_supported_p): Add mistakenly
(aarch64_pstatefield_supported_p): Move feature checks for AT
(aarch64_sys_ins_reg_supported_p): .. to here.
Tristan, is this OK for the 2.26 branch?