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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2015-01-29 18:09:13 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2015-02-10 11:23:11 +0100
commitada63d40747128d922d69f73a37b65e1e5403cdf (patch)
tree655ac5b0a4b3e69d1c34d5533c103998891fad27 /arch/arm
parentARM: 8291/1: replace magic number with PAGE_SHIFT macro in fixup_pv code (diff)
downloadlinux-ada63d40747128d922d69f73a37b65e1e5403cdf.tar.xz
linux-ada63d40747128d922d69f73a37b65e1e5403cdf.zip
ARM: 8300/1: teach __asmeq that r11 == fp and r12 == ip
The __asmeq macro is used inside inline asm statements to ensure that register asm variables that explicitly specify a register are mapped correctly onto those registers when used in inline asm input and output constraints. However, the string based matching fails to take into account that 'fp' is often referred to as 'r11' and 'ip' is often referred to as 'r12', (e.g., by clang), causing false negatives. Fix this by making __asmeq consider the ("fp","r11"), ("r11","fp"), ("ip","r12") and ("r12","ip") cases specifically. Reviewed-by: Alex Elder <elder@linaro.org> Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/include/asm/compiler.h15
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/arm/include/asm/compiler.h b/arch/arm/include/asm/compiler.h
index 8155db2f7fa1..29fe85e59439 100644
--- a/arch/arm/include/asm/compiler.h
+++ b/arch/arm/include/asm/compiler.h
@@ -8,8 +8,21 @@
* This string is meant to be concatenated with the inline asm string and
* will cause compilation to stop on mismatch.
* (for details, see gcc PR 15089)
+ * For compatibility with clang, we have to specifically take the equivalence
+ * of 'r11' <-> 'fp' and 'r12' <-> 'ip' into account as well.
*/
-#define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
+#define __asmeq(x, y) \
+ ".ifnc " x "," y "; " \
+ ".ifnc " x y ",fpr11; " \
+ ".ifnc " x y ",r11fp; " \
+ ".ifnc " x y ",ipr12; " \
+ ".ifnc " x y ",r12ip; " \
+ ".err; " \
+ ".endif; " \
+ ".endif; " \
+ ".endif; " \
+ ".endif; " \
+ ".endif\n\t"
#endif /* __ASM_ARM_COMPILER_H */