On Thu, Jul 9, 2020 at 2:56 PM Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> wrote: > > On Fri, Jul 03, 2020 at 04:32:06PM +0200, Sedat Dilek wrote: > > 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@xxxxxxxxx> > > Suggested-by: Craig Topper <craig.topper@xxxxxxxxx> > > Suggested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > > Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > > Cc: "ClangBuiltLinux" <clang-built-linux@xxxxxxxxxxxxxxxx> > > 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@xxxxxxxxx> > > --- > > Changes v4->v5: > > - Drop "5.7" tag from subject line as requested by Herbert Xu > > - Add Link to LLVM bug #24494 (thanks Nick) > > > > Changes v3->v4: > > - Add <> around email address as desired by Nick > > - Add Nick's Reviewed-by > > > > Changes v2->v3: > > - Add this Changelog > > > > Changes v1->v2: > > - Replace Cc by Suggested-by for Craig > > - Replace Cc by Suggested-by for Nick (dropped Cc as desired) > > - Really follow the suggestions of Craig > > - Drop unneeded comments for my build-environment and Links > > > > arch/x86/crypto/aesni-intel_asm.S | 6 +++--- > > 1 file changed, 3 insertions(+), 3 deletions(-) > > Patch applied. Thanks. [ CC Arnd ] Thanks Herbert. Last Monday I switched over from Linux v5.7.y to v5.8-rc4 and my patch applied cleanly - I was able to build and boot on bare metal. One request : We (ClangBuiltLinux folks) need at least Arnd's patch (see [1])... "x86: crypto: fix building crc32c with clang ias" ...to be full compliant with LLVM_IAS=1. We had some discussion internally (see [2]-[4]). Looking at Arnd's patch again: It was also sent to linux-crypto ML (May 27, 2020, 2:17 p.m. UTC). If you pick this directly, feel free to add my: Reported-by: Sedat Dilek <sedat.dilek@xxxxxxxxx> Tested-by: Sedat Dilek <sedat.dilek@xxxxxxxxx> If you have any other wishes/requirements, please let me know. Regards, - Sedat - P.S.: If you are interested in the status of LLVM_IAS=1 see [5] - it needs to be updated to my recent experiments with Linux v5.8-rc4. P.S.S.: BTW, a recent version of llvm-toolchain v11.0.0-git is full compliant with LLVM=1 - no GNU/binutils/tools used just LLVM/utilities (beyond GNU/make) :-). [1] https://lore.kernel.org/patchwork/patch/1248401/ [2] https://github.com/ClangBuiltLinux/linux/issues/1010 [3] https://github.com/ClangBuiltLinux/linux/issues/1010#issuecomment-653759336 [4] https://github.com/ClangBuiltLinux/linux/issues/1010#issuecomment-656406876 [5] https://github.com/ClangBuiltLinux/linux/issues/1049 ADDENDUM: Demonstrate/show used Clang's integrated assembler (IAS): $ llvm-dwarfdump-11 arch/x86/crypto/crc32c-intel.o ... 0x0000adc3: DW_TAG_compile_unit DW_AT_stmt_list (0x00000b94) DW_AT_ranges (0x00000040 [0x0000000000000350, 0x0000000000001430) [0x0000000000000000, 0x000000000000000a)) DW_AT_name ("arch/x86/crypto/crc32c-pcl-intel-asm_64.S") DW_AT_comp_dir ("/home/dileks/src/linux-kernel/git") DW_AT_producer ("Debian clang version 11.0.0-++20200701093119+ffee8040534-1~exp1 ") DW_AT_language (DW_LANG_Mips_Assembler) ... - EOT -
