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1 // Copyright 2016 The Go Authors. All rights reserved.
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2 // Use of this source code is governed by a BSD-style
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3 // license that can be found in the LICENSE file.
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4
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5 // +build mips64 mips64le
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6 // +build !gccgo
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7
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8 #include "textflag.h"
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9
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10 #define SYNC WORD $0xf
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11
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12 TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0
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13 // Rewind stack pointer so anything that happens on the stack
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14 // will clobber the test pattern created by the caller
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15 ADDV $(1024*8), R29
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16
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17 // Ask signaller to setgid
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18 MOVW $1, R1
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19 SYNC
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20 MOVW R1, ·Baton(SB)
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21 SYNC
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22
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23 // Wait for setgid completion
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24 loop:
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25 SYNC
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26 MOVW ·Baton(SB), R1
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27 OR R2, R2, R2 // hint that we're in a spin loop
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28 BNE R1, loop
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29 SYNC
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30
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31 // Restore stack
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32 ADDV $(-1024*8), R29
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33 RET
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