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authorArnd Bergmann <arnd@arndb.de>2021-10-18 15:30:07 +0100
committerRussell King (Oracle) <rmk+kernel@armlinux.org.uk>2021-10-25 13:12:33 +0100
commit8b5bd5adf9e6d073e538e2e9de810f2f25379c3b (patch)
treee267640f488fd8625aaea7af26042b34f6068ee4
parent345dac33f58894a56d17b92a41be10e16585ceff (diff)
downloadlinux-8b5bd5adf9e6d073e538e2e9de810f2f25379c3b.tar.gz
ARM: 9137/1: disallow CONFIG_THUMB with ARMv4
We can currently build a multi-cpu enabled kernel that allows both ARMv4
and ARMv5 CPUs, and also supports THUMB mode in user space.

However, returning to user space in this configuration with the usr_ret
macro requires the use of the 'bx' instruction, which is refused by
the assembler:

arch/arm/kernel/entry-armv.S: Assembler messages:
arch/arm/kernel/entry-armv.S:937: Error: selected processor does not support `bx lr' in ARM mode
arch/arm/kernel/entry-armv.S:960: Error: selected processor does not support `bx lr' in ARM mode
arch/arm/kernel/entry-armv.S:1003: Error: selected processor does not support `bx lr' in ARM mode
<instantiation>:2:2: note: instruction requires: armv4t
 bx lr

While it would be possible to handle this correctly in principle, doing so
seems to not be worth it, if we can simply avoid the problem by enforcing
that a kernel supporting both ARMv4 and a later CPU architecture cannot
run THUMB binaries.

This turned up while build-testing with clang; for some reason,
gcc never triggered the problem.

Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
-rw-r--r--arch/arm/mm/Kconfig2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 82aa990c4180..58afba346729 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -675,7 +675,7 @@ config ARM_PV_FIXUP
 
 config ARM_THUMB
 	bool "Support Thumb user binaries" if !CPU_THUMBONLY && EXPERT
-	depends on CPU_THUMB_CAPABLE
+	depends on CPU_THUMB_CAPABLE && !CPU_32v4
 	default y
 	help
 	  Say Y if you want to include kernel support for running user space