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authorNicolas Pitre <nico@cam.org>2008-10-23 04:34:08 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-10-23 12:53:32 +0100
commit884afaab44c9f92eb618ce53b3d2b5316f174a39 (patch)
tree4d2795bc6050916411092736e5fe37ba5640983d /arch/arm/include
parentf80a3bb252cbb0959259328b9ab02b019123ed05 (diff)
[ARM] 5320/1: fix assembly constraints in implementation of do_div()
Those inline assembly segments using the umlal instruction must have the & modifier so to be sure that a purely input register won't alias one of the registers used as input+output. In most cases, the inputs are still used after the outputs are touched, and most binutil versions insist on "rdhi, rdlo and rm must all be different" even for ARMv6+. Signed-off-by: Nicolas Pitre <nico@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include')
-rw-r--r--arch/arm/include/asm/div64.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/include/asm/div64.h b/arch/arm/include/asm/div64.h
index 5001390be95..d3f0a9eee9f 100644
--- a/arch/arm/include/asm/div64.h
+++ b/arch/arm/include/asm/div64.h
@@ -165,7 +165,7 @@
__res = __m; \
asm ( "umlal %Q0, %R0, %Q1, %Q2\n\t" \
"mov %Q0, #0" \
- : "+r" (__res) \
+ : "+&r" (__res) \
: "r" (__m), "r" (__n) \
: "cc" ); \
} else { \
@@ -182,7 +182,7 @@
"umlal %R0, %Q0, %Q1, %R2\n\t" \
"mov %R0, #0\n\t" \
"umlal %Q0, %R0, %R1, %R2" \
- : "+r" (__res) \
+ : "+&r" (__res) \
: "r" (__m), "r" (__n) \
: "cc" ); \
} else { \
@@ -192,7 +192,7 @@
"adds %Q0, %1, %Q0\n\t" \
"adc %R0, %R0, #0\n\t" \
"umlal %Q0, %R0, %R2, %R3" \
- : "+r" (__res), "+r" (__z) \
+ : "+&r" (__res), "+&r" (__z) \
: "r" (__m), "r" (__n) \
: "cc" ); \
} \