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| author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2017-11-29 07:52:52 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2017-12-17 23:14:21 +0100 |
| commit | 75fea300d73ae5b18957949a53ec770daaeb6fc2 (patch) | |
| tree | 9e07e50f5b8992512603774358e0979906237a59 /arch/arm/Kconfig | |
| parent | ARM: verify size of zImage (diff) | |
| download | linux-75fea300d73ae5b18957949a53ec770daaeb6fc2.tar.xz linux-75fea300d73ae5b18957949a53ec770daaeb6fc2.zip | |
ARM: 8723/2: always assume the "unified" syntax for assembly code
The GNU assembler has implemented the "unified syntax" parsing since
2005. This "unified" syntax is required when the kernel is built in
Thumb2 mode. However the "unified" syntax is a mixed bag of features,
including not requiring a `#' prefix with immediate operands. This leads
to situations where some code builds just fine in Thumb2 mode and fails
to build in ARM mode if that prefix is missing. This behavior
discrepancy makes build tests less valuable, forcing both ARM and Thumb2
builds for proper coverage.
Let's "fix" this issue by always using the "unified" syntax for both ARM
and Thumb2 mode. Given that the documented minimum binutils version that
properly builds the kernel is version 2.20 released in 2010, we can
assume that any toolchain capable of building the latest kernel is also
"unified syntax" capable.
Whith this, a bunch of macros used to mask some differences between both
syntaxes can be removed, with the side effect of making LTO easier.
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 51c8df561077..438231500510 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1524,12 +1524,10 @@ config THUMB2_KERNEL bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K default y if CPU_THUMBONLY - select ARM_ASM_UNIFIED select ARM_UNWIND help By enabling this option, the kernel will be compiled in - Thumb-2 mode. A compiler/assembler that understand the unified - ARM-Thumb syntax is needed. + Thumb-2 mode. If unsure, say N. @@ -1564,9 +1562,6 @@ config THUMB2_AVOID_R_ARM_THM_JUMP11 Unless you are sure your tools don't have this problem, say Y. -config ARM_ASM_UNIFIED - bool - config ARM_PATCH_IDIV bool "Runtime patch udiv/sdiv instructions into __aeabi_{u}idiv()" depends on CPU_32v7 && !XIP_KERNEL |