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LoongArch: Only allow OBJTOOL & ORC unwinder if toolchain supports -mthin-add-sub
GAS <= 2.41 does not support generating R_LARCH_{32,64}_PCREL for "label - ." and it generates R_LARCH_{ADD,SUB}{32,64} pairs instead. Objtool cannot handle R_LARCH_{ADD,SUB}{32,64} pair in __jump_table (static key implementation) and etc. so it will produce some warnings. This is causing the kernel CI systems to complain everywhere. For GAS we can check if -mthin-add-sub option is available to know if R_LARCH_{32,64}_PCREL are supported. For Clang, we require Clang >= 18 and Clang >= 17 already supports R_LARCH_{32,64}_PCREL. But unfortunately Clang has some other issues, so we disable objtool for Clang at present. Note that __jump_table here is not generated by the compiler, so -fno-jump-table is completely irrelevant for this issue. Fixes: cb8a2ef0848c ("LoongArch: Add ORC stack unwinder support") Closes: https://lore.kernel.org/loongarch/Zl5m1ZlVmGKitAof@yujie-X299/ Closes: https://lore.kernel.org/loongarch/ZlY1gDDPi_mNrwJ1@slm.duckdns.org/ Closes: https://lore.kernel.org/loongarch/1717478006.038663-1-hengqi@linux.alibaba.com/ Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=816029e06768 Link: https://github.com/llvm/llvm-project/commit/42cb3c6346fc Signed-off-by: Xi Ruoyao <xry111@xry111.site> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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@ -143,7 +143,7 @@ config LOONGARCH
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select HAVE_LIVEPATCH
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select HAVE_MOD_ARCH_SPECIFIC
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select HAVE_NMI
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select HAVE_OBJTOOL if AS_HAS_EXPLICIT_RELOCS
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select HAVE_OBJTOOL if AS_HAS_EXPLICIT_RELOCS && AS_HAS_THIN_ADD_SUB && !CC_IS_CLANG
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select HAVE_PCI
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select HAVE_PERF_EVENTS
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select HAVE_PERF_REGS
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@ -261,6 +261,9 @@ config AS_HAS_EXPLICIT_RELOCS
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config AS_HAS_FCSR_CLASS
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def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0)
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config AS_HAS_THIN_ADD_SUB
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def_bool $(cc-option,-Wa$(comma)-mthin-add-sub)
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config AS_HAS_LSX_EXTENSION
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def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0)
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@ -28,6 +28,7 @@ config UNWINDER_PROLOGUE
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config UNWINDER_ORC
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bool "ORC unwinder"
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depends on HAVE_OBJTOOL
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select OBJTOOL
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help
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This option enables the ORC (Oops Rewind Capability) unwinder for
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