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misc/cgo/test/issue9400: add arm64 implementation

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Change-Id: I309e3df7608b9eef9339196fdc50dedf5f9439f4
Reviewed-on: https://go-review.googlesource.com/8451
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
This commit is contained in:
Shenghou Ma 2015-04-03 04:37:24 -04:00 committed by Minux Ma
parent d0b62d8bfa
commit 6508518849
1 changed files with 33 additions and 0 deletions
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33
misc/cgo/test/issue9400/asm_arm64.s Normal file
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#include "textflag.h"
TEXT ·RewindAndSetgid(SB),NOSPLIT,$-8-0
// Save link register
MOVD R30, R9
// Rewind stack pointer so anything that happens on the stack
// will clobber the test pattern created by the caller
ADD $(1024 * 8), RSP
// Ask signaller to setgid
MOVD $·Baton(SB), R0
MOVD $1, R1
storeloop:
LDAXRW (R0), R2
STLXRW R1, (R0), R3
CBNZ R3, storeloop
// Wait for setgid completion
MOVW $0, R1
MOVW $0, R2
loop:
LDAXRW (R0), R3
CMPW R1, R3
BNE loop
STLXRW R2, (R0), R3
CBNZ R3, loop
// Restore stack
SUB $(1024 * 8), RSP
MOVD R9, R30
RET