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| author | Marc Zyngier <marc.zyngier@arm.com> | 2016-12-06 15:27:43 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-12-06 15:54:21 +0000 |
| commit | bbb56c27228d4ad64aca858c5af49d0f2f11c645 (patch) | |
| tree | bee9381f7216018593b2a687db02f183b2672c5d /arch/arm64/Makefile | |
| parent | 49f5522e495aba58feb1ca58123805929710bddd (diff) | |
| download | lwn-bbb56c27228d4ad64aca858c5af49d0f2f11c645.tar.gz lwn-bbb56c27228d4ad64aca858c5af49d0f2f11c645.zip | |
arm64: Add detection code for broken .inst support in binutils
Binutils version up to (and including) 2.25 have a pathological
behaviour when it comes to mixing .inst directive and arithmetic
involving labels. The assembler complains about non-constant
expressions and compilation stops pretty quickly.
In order to detect this and work around it, let's add a bit of
detection code that will set the CONFIG_BROKEN_GAS_INST option
should a broken gas be detected.
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/Makefile')
| -rw-r--r-- | arch/arm64/Makefile | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 3635b8662724..b9a4a934ca05 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -37,10 +37,16 @@ $(warning LSE atomics not supported by binutils) endif endif -KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) +brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1) + +ifneq ($(brokengasinst),) +$(warning Detected assembler with broken .inst; disassembly will be unreliable) +endif + +KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst) KBUILD_CFLAGS += -fno-asynchronous-unwind-tables KBUILD_CFLAGS += $(call cc-option, -mpc-relative-literal-loads) -KBUILD_AFLAGS += $(lseinstr) +KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) KBUILD_CPPFLAGS += -mbig-endian |