[PATCH 0/2] aarch64: add Branch Record Buffer extension instructions

[Richard Earnshaw (lists)]

On 07/06/2024 14:59, Claudio Bantaloukas wrote:
> 
> The FEAT_BRBE extension provides two aliases of sys:
> - brb iall (Invalidates all Branch records in the Branch Record Buffer)
> - brb inj (Injects the Branch Record held in BRBINFINJ_EL1,
>   BRBSRCINJ_EL1, and BRBTGTINJ_EL1 into the Branch Record Buffer)
> 
> This patch adds:
> - the feature option "brbe" that must be added for the aliases to be available
> - a new operand flag AARCH64_OPND_Rt_IN_SYS_ALIASES that warns in a comment
>   when Rt is set to the non default value 0b11111 (it is constrained
>   unpredictable whether the instruction is undefined or behaves as if the Rt
>   field is set to 0b11111).
> - a new operand flag AARCH64_OPND_BRBOP that encodes and decodes Op2 values
>   from bit 5
> - support for the two brb aliases above
> 
> See:
> - https://developer.arm.com/documentation/ddi0602/2024-03/Base-Instructions/BRB--Branch-Record-Buffer--an-alias-of-SYS-?lang=en
> - https://developer.arm.com/documentation/ddi0601/2024-03/AArch64-Instructions/BRB-INJ--Branch-Record-Injection-into-the-Branch-Record-Buffer?lang=en
> - https://developer.arm.com/documentation/ddi0601/2024-03/AArch64-Instructions/BRB-IALL--Invalidate-the-Branch-Record-Buffer?lang=en
> 
> ---
> 
> Hi,
> 
> is this ok for master? I don't have commit rights, could someone merge this for me please?
> 
> Tested on aarch64-none-elf and aarch64-unknown-linux-gnu

Squashed the two commits and pushed to master.

Thanks,

R.

> 
> Thanks,
> Claudio
> 
> 
> Claudio Bantaloukas (2):
>   aarch64: add Branch Record Buffer extension instructions
>   aarch64: add Branch Record Buffer extension instructions
> 
>  gas/config/tc-aarch64.c                      |    8 +
>  gas/doc/c-aarch64.texi                       |    2 +
>  gas/testsuite/gas/aarch64/brbe-brb-bad.d     |    2 +
>  gas/testsuite/gas/aarch64/brbe-brb-bad.l     |    4 +
>  gas/testsuite/gas/aarch64/brbe-brb-bad.s     |    6 +
>  gas/testsuite/gas/aarch64/brbe-brb-inst.d    |   14 +
>  gas/testsuite/gas/aarch64/brbe-brb-inst.s    |    5 +
>  gas/testsuite/gas/aarch64/brbe-brb-invalid.d |    3 +
>  gas/testsuite/gas/aarch64/brbe-brb-invalid.l |    3 +
>  gas/testsuite/gas/aarch64/brbe-brb.d         |   12 +
>  gas/testsuite/gas/aarch64/brbe-brb.s         |    5 +
>  include/opcode/aarch64.h                     |    7 +-
>  opcodes/aarch64-asm-2.c                      |  363 +-
>  opcodes/aarch64-dis-2.c                      | 4523 +++++++++---------
>  opcodes/aarch64-opc-2.c                      |   18 +-
>  opcodes/aarch64-opc.c                        |   24 +
>  opcodes/aarch64-opc.h                        |    1 +
>  opcodes/aarch64-tbl.h                        |   15 +
>  18 files changed, 2566 insertions(+), 2449 deletions(-)
>  create mode 100644 gas/testsuite/gas/aarch64/brbe-brb-bad.d
>  create mode 100644 gas/testsuite/gas/aarch64/brbe-brb-bad.l
>  create mode 100644 gas/testsuite/gas/aarch64/brbe-brb-bad.s
>  create mode 100644 gas/testsuite/gas/aarch64/brbe-brb-inst.d
>  create mode 100644 gas/testsuite/gas/aarch64/brbe-brb-inst.s
>  create mode 100644 gas/testsuite/gas/aarch64/brbe-brb-invalid.d
>  create mode 100644 gas/testsuite/gas/aarch64/brbe-brb-invalid.l
>  create mode 100644 gas/testsuite/gas/aarch64/brbe-brb.d
>  create mode 100644 gas/testsuite/gas/aarch64/brbe-brb.s
>