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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-06-09 11:14:53 +0200
committerRussell King <rmk+kernel@armlinux.org.uk>2017-06-12 16:47:27 +0200
commit60ce2858514ed9ccaf00dc7e9f4dc219537e9855 (patch)
treefeada373be9aad576df706d119039e661ecc6e19
parentARM: 8677/1: boot/compressed: fix decompressor header layout for v7-M (diff)
downloadlinux-60ce2858514ed9ccaf00dc7e9f4dc219537e9855.tar.xz
linux-60ce2858514ed9ccaf00dc7e9f4dc219537e9855.zip
ARM: 8680/1: boot/compressed: fix inappropriate Thumb2 mnemonic for __nop
Commit 06a4b6d009a1 ("ARM: 8677/1: boot/compressed: fix decompressor header layout for v7-M") fixed an issue in the layout of the header of the compressed kernel image that was caused by the assembler emitting narrow opcodes for 'mov r0, r0', and for this reason, the mnemonic was updated to use the W() macro, which will append the .w suffix (which forces a wide encoding) if required, i.e., when building the kernel in Thumb2 mode. However, this failed to take into account that on Thumb2 kernels built for CPUs that are also ARM capable, the entry point is entered in ARM mode, and so the instructions emitted here will be ARM instructions that only exist in a wide encoding to begin with, which is why the assembler rejects the .w suffix here and aborts the build with the following message: head.S: Assembler messages: head.S:132: Error: width suffixes are invalid in ARM mode -- `mov.w r0,r0' So replace the W(mov) with separate ARM and Thumb2 instructions, where the latter will only be used for THUMB2_ONLY builds. Fixes: 06a4b6d009a1 ("ARM: 8677/1: boot/compressed: fix decompressor ...") Reported-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
-rw-r--r--arch/arm/boot/compressed/efi-header.S3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/boot/compressed/efi-header.S b/arch/arm/boot/compressed/efi-header.S
index 3f7d1b74c5e0..a17ca8d78656 100644
--- a/arch/arm/boot/compressed/efi-header.S
+++ b/arch/arm/boot/compressed/efi-header.S
@@ -17,7 +17,8 @@
@ there.
.inst 'M' | ('Z' << 8) | (0x1310 << 16) @ tstne r0, #0x4d000
#else
- W(mov) r0, r0
+ AR_CLASS( mov r0, r0 )
+ M_CLASS( nop.w )
#endif
.endm