On Wed, 10 Nov 2021 13:22:37 GMT, Andrew Haley <a...@openjdk.org> wrote:
>> Alan Hayward has updated the pull request incrementally with one additional
>> commit since the last revision:
>>
>> Simplify branch protection configure check
>
> src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp line 5185:
>
>> 5183: // ROP Protection
>> 5184:
>> 5185: void MacroAssembler::protect_return_address() {
>
> We need proper, full, detailed comments about what these functions do, with
> reference to primary AArch64 documentation.
As far as the AArch64 docs are concerned the relevant details are provided in
ARM-ARM D
- The PAC functionality is described in ARM-ARM Section D5.1.5
- Overview of the PAC instructions is provided in section C3.1.9
- Detailed PAC instruction descriptions are provided in C6.2.195 - C6.2.199
n.b. I am specifically referring to my (possibly out of date) copy ARM-DDI
0487D.a (ID103018) which is the Initial v8.4 EAC release from 2018.
That said, I agree that a description of how these functions use the underlying
PAC support and what, effectively, they achieve via that usage would be
necessary. A reference to the relevant sections of the ARM doc in the code
would be helpful.
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PR: https://git.openjdk.java.net/jdk/pull/6334
