| commit | 72476aca8f585a026a54cf71ccdf7bed26db1903 | [log] [tgz] |
|---|---|---|
| author | Claudio Bantaloukas <claudio.bantaloukas@arm.com> | Fri Jun 07 13:59:02 2024 +0000 |
| committer | Richard Earnshaw <rearnsha@arm.com> | Wed Jun 12 14:58:35 2024 +0100 |
| tree | 317b329a9873bc5308abd0476d0d5d6d36d6a533 | |
| parent | 292b9a302933418abcb8b76b23e83af8028c659a [diff] |
aarch64: add Branch Record Buffer extension instructions 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