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arm runtime: attempt to fix build by adding casp (same as cas)

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untested.

Fixes #1523.

R=rsc
CC=golang-dev
https://golang.org/cl/4171057
This commit is contained in:
Rob Pike 2011-02-16 22:01:57 -08:00
parent 6ccc96eea9
commit eb8688154b
2 changed files with 56 additions and 2 deletions
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35
src/pkg/runtime/arm/cas5.s
View File

@ -20,7 +20,6 @@ TEXT runtime·cas(SB),7,$0
MOVW 8(FP), R2 // new
MOVW $1, R3
MOVW $runtime·cas_mutex(SB), R4
l:
SWPW (R4), R3 // acquire mutex
CMP $0, R3
BNE fail0
@ -38,6 +37,38 @@ fail1:
fail0:
MOVW $0, R0
RET
// bool casp(void **p, void *old, void *new)
// Atomically:
// if(*p == old){
// *p = new;
// return 1;
// }else
// return 0;
TEXT runtime·casp(SB),7,$0
MOVW 0(FP), R0 // *p
MOVW 4(FP), R1 // old
MOVW 8(FP), R2 // new
MOVW $1, R3
MOVW $runtime·cas_mutex(SB), R4
SWPW (R4), R3 // acquire mutex
CMP $0, R3
BNE failp0
MOVW (R0), R5
CMP R1, R5
BNE failp1
MOVW R2, (R0)
MOVW R3, (R4) // release mutex
MOVW $1, R0
RET
failp1:
MOVW R3, (R4) // release mutex
failp0:
MOVW $0, R0
RET
DATA runtime·cas_mutex(SB)/4, $0
GLOBL runtime·cas_mutex(SB), $4

23
src/pkg/runtime/arm/cas6.s
View File

@ -27,3 +27,26 @@ fail:
MOVW $0, R0
RET
// bool casp(void **p, void *old, void *new)
// Atomically:
// if(*p == old){
// *p = new;
// return 1;
// }else
// return 0;
TEXT runtime·casp(SB), 7, $0
MOVW 0(FP), R1 // *p
MOVW 4(FP), R2 // old
MOVW 8(FP), R3 // new
lp:
LDREX (R1), R0
CMP R0, R2
BNE failp
STREX R3, (R1), R0
CMP $0, R0
BNE lp
MOVW $1, R0
RET
failp:
MOVW $0, R0
RET