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| author | Sukanya Rajkhowa <c_srajkh@quicinc.com> | 2009-11-19 20:02:46 -0800 |
|---|---|---|
| committer | Sukanya Rajkhowa <c_srajkh@quicinc.com> | 2009-11-19 20:02:46 -0800 |
| commit | 13494856a724106b356155f43959fde1bfc8dd1b (patch) | |
| tree | a55e4d68867703c1fbf6af32360671fa61d077b7 /libc | |
| parent | f2c01a09f31a54e36754a1a3215ba434c41f6f40 (diff) | |
| download | bionic-13494856a724106b356155f43959fde1bfc8dd1b.zip bionic-13494856a724106b356155f43959fde1bfc8dd1b.tar.gz bionic-13494856a724106b356155f43959fde1bfc8dd1b.tar.bz2 | |
bionic: Use ldrex/strex instead of swp instruction to be multicore safe
swp instruction is disabled by default on msm7630 target
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/arch-arm/bionic/atomics_arm.S | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/libc/arch-arm/bionic/atomics_arm.S b/libc/arch-arm/bionic/atomics_arm.S index f8b23e6..4890c76 100644 --- a/libc/arch-arm/bionic/atomics_arm.S +++ b/libc/arch-arm/bionic/atomics_arm.S @@ -139,7 +139,12 @@ __atomic_inc: /* r0(new) r1(addr) -> r0(old) */ __atomic_swap: - swp r0, r0, [r1] +1: + .word 0xe1912f9f /* ldrex r2, [r1] */ + .word 0xe1813f90 /* strex r3, r0, [r1] */ + cmp r3, #0 + bne 1b + mov r0, r2 bx lr /* __futex_wait(*ftx, val, *timespec) */ |