On Thu, Jan 28, 2021 at 5:44 AM 'Nick Desaulniers' via Clang Built
Linux <clang-built-li...@googlegroups.com> wrote:
>
> Clang's integrated assembler only accepts UAL syntax, rewrite the
> instructions that were changed by RVCTv2.1.
>
> The document "Assembly language changes after RVCTv2.1" was very
> helpful.
>
> This exposed a bug in Clang's integrated assembler, which hopefully will
> land in clang-12, but is required to test this patch with LLVM_IAS=1.
>
> Link:
> https://developer.arm.com/documentation/dui0473/c/writing-arm-assembly-language/assembly-language-changes-after-rvctv2-1
> Link: https://github.com/ClangBuiltLinux/linux/issues/1271
> Link: https://reviews.llvm.org/D95586
> Reported-by: Arnd Bergmann <a...@arndb.de>
> Signed-off-by: Nick Desaulniers <ndesaulni...@google.com>
> ---
> arch/arm/probes/kprobes/test-arm.c | 288 ++++++++++++++---------------
> 1 file changed, 144 insertions(+), 144 deletions(-)
This mostly works, but I see one extra case in some configurations:
arch/arm/probes/kprobes/test-arm.c:453:2: error: invalid instruction,
did you mean: swpb?
TEST_R( "swpvsb r0, r",1,VAL1,", [sp]")
^
arch/arm/probes/kprobes/test-core.h:235:2: note: expanded from macro 'TEST_R'
TEST_INSTRUCTION(code1 #reg code2) \
^
arch/arm/probes/kprobes/test-core.h:155:17: note: expanded from macro
'TEST_INSTRUCTION'
"50: nop \n\t" \
^
<inline asm>:20:5: note: instantiated into assembly here
1: swpvsb r0, r1, [sp]
^~~~~~
Plus a lot of extra errors when building with CONFIG_THUMB2_KERNEL,
as that uses tests in arch/arm/probes/kprobes/test-thumb.c.
Arnd
