Re: [PATCH v4] arm64: Add basic MTE test

[Andrew Jones <andrew.jones@linux.dev>]

On Thu, Feb 27, 2025 at 03:22:40PM +0000, Vladimir Murzin wrote:
> Test tag storage access and tag mismatch for different MTE modes.
> 
> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
> ---
>  arm/Makefile.arm64            |   8 +
>  arm/cstart64.S                |   4 +-
>  arm/mte.c                     | 313 ++++++++++++++++++++++++++++++++++
>  arm/unittests.cfg             |  19 +++
>  lib/arm64/asm/mmu.h           |   1 +
>  lib/arm64/asm/pgtable-hwdef.h |   3 +
>  lib/arm64/asm/sysreg.h        |  14 ++
>  7 files changed, 361 insertions(+), 1 deletion(-)
>  create mode 100644 arm/mte.c
>

Unfortunately this is failing builds with clang.

arm/mte.c:65:18: error: value size does not match register size specified by the constraint and modifier [-Werror,-Wasm-operand-widths]
   65 |                       : "=&r" (r)
      |                                ^
arm/mte.c:63:21: note: use constraint modifier "w"
   63 |         asm volatile ("ldr %0,[%1]\n"
      |                            ^~
      |                            %w0
arm/mte.c:65:18: error: value size does not match register size specified by the constraint and modifier [-Werror,-Wasm-operand-widths]
   65 |                       : "=&r" (r)
      |                                ^
arm/mte.c:64:14: note: use constraint modifier "w"
   64 |                       "str %0,[%2]\n"
      |                            ^~
      |                            %w0
arm/mte.c:75:16: error: value size does not match register size specified by the constraint and modifier [-Werror,-Wasm-operand-widths]
   75 |                       : "r" (val), "r" (addr)
      |                              ^
arm/mte.c:72:21: note: use constraint modifier "w"
   72 |         asm volatile ("str %0,[%1]\n"
      |                            ^~
      |                            %w0

Thanks,
drew