Re: git: c65679143f82 - main - arm64: Decode the ID_AA64MMFR3_EL1 register

On 7/28/23 5:08 AM, Andrew Turner wrote:
> The branch main has been updated by andrew:
> 
> URL: https://cgit.FreeBSD.org/src/commit/?id=c65679143f82e28b3aa078f16311350c31a33776
> 
> commit c65679143f82e28b3aa078f16311350c31a33776
> Author:     Andrew Turner <andrew@FreeBSD.org>
> AuthorDate: 2023-07-06 13:28:23 +0000
> Commit:     Andrew Turner <andrew@FreeBSD.org>
> CommitDate: 2023-07-28 11:53:02 +0000
> 
>      arm64: Decode the ID_AA64MMFR3_EL1 register
>      
>      Sponsored by:   Arm Ltd
>      Differential Revision:  https://reviews.freebsd.org/D40893

This (and some following commits) broke the aarch64 build jobs on GitHub.
I wonder if these registers are unknown by clang versions older than LLVM16
or LLVM15?  The cross-build jobs use clang 12/13/14.

The errors:

bmake[2]: "/home/runner/work/freebsd-src/build/home/runner/work/freebsd-src/freebsd-src/arm64.aarch64/sys/GENERIC/Makefile" line 47: warning: "Compiler is too old to support PERTHREAD_SSP"
/home/runner/work/freebsd-src/freebsd-src/sys/arm64/arm64/identcpu.c:2707:23: error: expected readable system register
         desc->id_aa64mmfr3 = READ_SPECIALREG(id_aa64mmfr3_el1);
                              ^
./machine/armreg.h:74:19: note: expanded from macro 'READ_SPECIALREG'
         __asm __volatile("mrs   %0, " __STRING(reg) : "=&r" (_val));    \
                          ^
<inline asm>:1:10: note: instantiated into assembly here
         mrs     x9, id_aa64mmfr3_el1
                     ^
/home/runner/work/freebsd-src/freebsd-src/sys/arm64/arm64/identcpu.c:2708:23: error: expected readable system register
         desc->id_aa64mmfr4 = READ_SPECIALREG(id_aa64mmfr4_el1);
                              ^
./machine/armreg.h:74:19: note: expanded from macro 'READ_SPECIALREG'
         __asm __volatile("mrs   %0, " __STRING(reg) : "=&r" (_val));    \
                          ^
<inline asm>:1:10: note: instantiated into assembly here
         mrs     x9, id_aa64mmfr4_el1
                     ^
/home/runner/work/freebsd-src/freebsd-src/sys/arm64/arm64/identcpu.c:2711:22: error: expected readable system register
         desc->id_aa64pfr2 = READ_SPECIALREG(id_aa64pfr2_el1);
                             ^
./machine/armreg.h:74:19: note: expanded from macro 'READ_SPECIALREG'
         __asm __volatile("mrs   %0, " __STRING(reg) : "=&r" (_val));    \
                          ^
<inline asm>:1:10: note: instantiated into assembly here
         mrs     x9, id_aa64pfr2_el1
                     ^
3 errors generated.
--- identcpu.o ---
*** [identcpu.o] Error code 1

bmake[2]: stopped in /home/runner/work/freebsd-src/build/home/runner/work/freebsd-src/freebsd-src/arm64.aarch64/sys/GENERIC
1 error

-- 
John Baldwin