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3347c8a079
When building with LLVM_IAS=1 means using Clang's Integrated Assembly (IAS)
from LLVM/Clang >= v10.0.1-rc1+ instead of GNU/as from GNU/binutils
I see the following breakage in Debian/testing AMD64:
<instantiation>:15:74: error: too many positional arguments
PRECOMPUTE 8*3+8(%rsp), %xmm1, %xmm2, %xmm3, %xmm4, %xmm5, %xmm6, %xmm7,
^
arch/x86/crypto/aesni-intel_asm.S:1598:2: note: while in macro instantiation
GCM_INIT %r9, 8*3 +8(%rsp), 8*3 +16(%rsp), 8*3 +24(%rsp)
^
<instantiation>:47:2: error: unknown use of instruction mnemonic without a size suffix
GHASH_4_ENCRYPT_4_PARALLEL_dec %xmm9, %xmm10, %xmm11, %xmm12, %xmm13, %xmm14, %xmm0, %xmm1, %xmm2, %xmm3, %xmm4, %xmm5, %xmm6, %xmm7, %xmm8, enc
^
arch/x86/crypto/aesni-intel_asm.S:1599:2: note: while in macro instantiation
GCM_ENC_DEC dec
^
<instantiation>:15:74: error: too many positional arguments
PRECOMPUTE 8*3+8(%rsp), %xmm1, %xmm2, %xmm3, %xmm4, %xmm5, %xmm6, %xmm7,
^
arch/x86/crypto/aesni-intel_asm.S:1686:2: note: while in macro instantiation
GCM_INIT %r9, 8*3 +8(%rsp), 8*3 +16(%rsp), 8*3 +24(%rsp)
^
<instantiation>:47:2: error: unknown use of instruction mnemonic without a size suffix
GHASH_4_ENCRYPT_4_PARALLEL_enc %xmm9, %xmm10, %xmm11, %xmm12, %xmm13, %xmm14, %xmm0, %xmm1, %xmm2, %xmm3, %xmm4, %xmm5, %xmm6, %xmm7, %xmm8, enc
^
arch/x86/crypto/aesni-intel_asm.S:1687:2: note: while in macro instantiation
GCM_ENC_DEC enc
Craig Topper suggested me in ClangBuiltLinux issue #1050:
> I think the "too many positional arguments" is because the parser isn't able
> to handle the trailing commas.
>
> The "unknown use of instruction mnemonic" is because the macro was named
> GHASH_4_ENCRYPT_4_PARALLEL_DEC but its being instantiated with
> GHASH_4_ENCRYPT_4_PARALLEL_dec I guess gas ignores case on the
> macro instantiation, but llvm doesn't.
First, I removed the trailing comma in the PRECOMPUTE line.
Second, I substituted:
1. GHASH_4_ENCRYPT_4_PARALLEL_DEC -> GHASH_4_ENCRYPT_4_PARALLEL_dec
2. GHASH_4_ENCRYPT_4_PARALLEL_ENC -> GHASH_4_ENCRYPT_4_PARALLEL_enc
With these changes I was able to build with LLVM_IAS=1 and boot on bare metal.
I confirmed that this works with Linux-kernel v5.7.5 final.
NOTE: This patch is on top of Linux v5.7 final.
Thanks to Craig and especially Nick for double-checking and his comments.
Suggested-by: Craig Topper <craig.topper@intel.com>
Suggested-by: Craig Topper <craig.topper@gmail.com>
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Cc: "ClangBuiltLinux" <clang-built-linux@googlegroups.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1050
Link: https://bugs.llvm.org/show_bug.cgi?id=24494
Signed-off-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.