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[ARM] 4264/1: ldrex/strex syntax errors with recent compilers 

Trying to build some code using atomic_clear_mask() on a ARM v6
processor with a recent compiler (tried with gcc version 4.1.1
(CodeSourcery ARM Sourcery G++ 2006q3-26), but
all gcc > 4.1 might be affected) results in the following:

/tmp/ccWKLJV8.s: Assembler messages:
/tmp/ccWKLJV8.s:581: Error: instruction does not accept this addressing
mode -- `ldrex r0,r3'
/tmp/ccWKLJV8.s:583: Error: instruction does not accept this addressing
mode -- `strex r1,r0,r3'

Older gcc (like gcc version 4.0.0 (DENX ELDK 4.1 4.0.0)) have no problem
with this.

The patch below fixes the compile error. I also verified that gcc-4.0.0 generates identical code using both forms.

Signed-off-by: Stelian Pop <stelian@popies.net>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Stelian Pop 2007-03-15 16:54:27 +01:00 committed by Russell King
parent 66fb8bd209
commit 0803c30c23
1 changed files with 2 additions and 2 deletions
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4
include/asm-arm/atomic.h
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@ -103,9 +103,9 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
unsigned long tmp, tmp2;
__asm__ __volatile__("@ atomic_clear_mask\n"
"1: ldrex %0, %2\n"
"1: ldrex %0, [%2]\n"
" bic %0, %0, %3\n"
" strex %1, %0, %2\n"
" strex %1, %0, [%2]\n"
" teq %1, #0\n"
" bne 1b"
: "=&r" (tmp), "=&r" (tmp2)