clang ias: failure to build arch/arm/mach-ep93xx/crunch-bits.S #1272
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[ARCH] arm32
This bug impacts ARCH=arm
[BUG] linux
A bug that should be fixed in the mainline kernel.
[FIXED][LINUX] 5.15
This bug was fixed in Linux 5.15
low priority
This bug is not critical and not a priority
[TOOL] integrated-as
The issue is relevant to LLVM integrated assembler
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nickdesaulniers
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[ARCH] arm32
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or force |
nickdesaulniers
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the
low priority
nickdesaulniers
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the
[PATCH] Submitted
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I've pinged on the list. |
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@arndb what's the status here? |
fengguang
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to 0day-ci/linux
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Aug 5, 2021
The MaverickCrunch support for ep93xx never made it into glibc and was removed from gcc in its 4.8 release in 2012. It is now one of the last parts of arch/arm/ that fails to build with the clang integrated assembler, which is unlikely to ever want to support it. The two alternatives are to force the use of binutils/gas when building the crunch support, or to remove it entirely. According to Hartley Sweeten: "Martin Guy did a lot of work trying to get the maverick crunch working but I was never able to successfully use it for anything. It "kind" of works but depending on the EP93xx silicon revision there are still a number of hardware bugs that either give imprecise or garbage results. I have no problem with removing the kernel support for the maverick crunch." Unless someone else comes up with a good reason to keep it around, remove it now. This touches mostly the ep93xx platform, but removes a bit of code from ARM common ptrace and signal frame handling as well. If there are remaining users of MaverickCrunch, they can use LTS kernels for at least another five years before kernel support ends. Link: https://lore.kernel.org/linux-arm-kernel/20210802141245.1146772-1-arnd@kernel.org/ Link: https://lore.kernel.org/linux-arm-kernel/20210226164345.3889993-1-arnd@kernel.org/ Link: ClangBuiltLinux#1272 Link: https://gcc.gnu.org/legacy-ml/gcc/2008-03/msg01063.html Cc: "Martin Guy" <martinwguy@martinwguy@gmail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Fixed now by removing crunch support. |
nickdesaulniers
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[BUG] linux
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This is yet another old FPU format, enabled with CONFIG_CRUNCH:
/git/arm-soc/arch/arm/mach-ep93xx/crunch-bits.S:94:2: error: invalid instruction
cfstr64 mvdx0, [r1, #0] @ save 64b registers
^
/git/arm-soc/arch/arm/mach-ep93xx/crunch-bits.S:95:2: error: invalid instruction
cfstr64 mvdx1, [r1, #8]
^
/git/arm-soc/arch/arm/mach-ep93xx/crunch-bits.S:96:2: error: invalid instruction
cfstr64 mvdx2, [r1, #16]
^
/git/arm-soc/arch/arm/mach-ep93xx/crunch-bits.S:97:2: error: invalid instruction
cfstr64 mvdx3, [r1, #24]
^
/git/arm-soc/arch/arm/mach-ep93xx/crunch-bits.S:98:2: error: invalid instruction
...
This is way more obscure than iWMMXt, we can probably just turn this off for clang, or for clang-ias
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