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| author | Michael Matloob <matloob@golang.org> | 2015-11-02 14:09:24 -0500 |
|---|---|---|
| committer | Michael Matloob <matloob@golang.org> | 2015-11-10 17:38:04 +0000 |
| commit | 67faca7d9c54b367aee5fdeef2d5dd609fcf99d0 (patch) | |
| tree | 5c6e8b4e243286311bbc4743d6a8e86f16dda85f /src/runtime/asm_arm.s | |
| parent | d33360571f46b46724b908a5603520dce1e8a81c (diff) | |
| download | go-67faca7d9c54b367aee5fdeef2d5dd609fcf99d0.tar.xz | |
runtime: break atomics out into package runtime/internal/atomic
This change breaks out most of the atomics functions in the runtime
into package runtime/internal/atomic. It adds some basic support
in the toolchain for runtime packages, and also modifies linux/arm
atomics to remove the dependency on the runtime's mutex. The mutexes
have been replaced with spinlocks.
all trybots are happy!
In addition to the trybots, I've tested on the darwin/arm64 builder,
on the darwin/arm builder, and on a ppc64le machine.
Change-Id: I6698c8e3cf3834f55ce5824059f44d00dc8e3c2f
Reviewed-on: https://go-review.googlesource.com/14204
Run-TryBot: Michael Matloob <matloob@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Diffstat (limited to 'src/runtime/asm_arm.s')
| -rw-r--r-- | src/runtime/asm_arm.s | 57 |
1 files changed, 0 insertions, 57 deletions
diff --git a/src/runtime/asm_arm.s b/src/runtime/asm_arm.s index 62f2a276e7..48fc321df3 100644 --- a/src/runtime/asm_arm.s +++ b/src/runtime/asm_arm.s @@ -695,63 +695,6 @@ TEXT runtime·abort(SB),NOSPLIT,$-4-0 MOVW $0, R0 MOVW (R0), R1 -// bool armcas(int32 *val, int32 old, int32 new) -// Atomically: -// if(*val == old){ -// *val = new; -// return 1; -// }else -// return 0; -// -// To implement runtime·cas in sys_$GOOS_arm.s -// using the native instructions, use: -// -// TEXT runtime·cas(SB),NOSPLIT,$0 -// B runtime·armcas(SB) -// -TEXT runtime·armcas(SB),NOSPLIT,$0-13 - MOVW valptr+0(FP), R1 - MOVW old+4(FP), R2 - MOVW new+8(FP), R3 -casl: - LDREX (R1), R0 - CMP R0, R2 - BNE casfail - - MOVB runtime·goarm(SB), R11 - CMP $7, R11 - BLT 2(PC) - WORD $0xf57ff05a // dmb ishst - - STREX R3, (R1), R0 - CMP $0, R0 - BNE casl - MOVW $1, R0 - - MOVB runtime·goarm(SB), R11 - CMP $7, R11 - BLT 2(PC) - WORD $0xf57ff05b // dmb ish - - MOVB R0, ret+12(FP) - RET -casfail: - MOVW $0, R0 - MOVB R0, ret+12(FP) - RET - -TEXT runtime·casuintptr(SB),NOSPLIT,$0-13 - B runtime·cas(SB) - -TEXT runtime·atomicloaduintptr(SB),NOSPLIT,$0-8 - B runtime·atomicload(SB) - -TEXT runtime·atomicloaduint(SB),NOSPLIT,$0-8 - B runtime·atomicload(SB) - -TEXT runtime·atomicstoreuintptr(SB),NOSPLIT,$0-8 - B runtime·atomicstore(SB) - // armPublicationBarrier is a native store/store barrier for ARMv7+. // On earlier ARM revisions, armPublicationBarrier is a no-op. // This will not work on SMP ARMv6 machines, if any are in use. |