2014-12-19 14:16:17 -07:00
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#include "textflag.h"
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TEXT cas<>(SB),NOSPLIT,$0
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2015-02-17 14:37:06 -07:00
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MOVW $0xffff0fc0, R15 // R15 is PC
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2014-12-19 14:16:17 -07:00
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TEXT ·RewindAndSetgid(SB),NOSPLIT,$-4-0
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// Save link register
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MOVW R14, R4
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// Rewind stack pointer so anything that happens on the stack
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// will clobber the test pattern created by the caller
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ADD $(1024 * 8), R13
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// Ask signaller to setgid
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MOVW $·Baton(SB), R2
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storeloop:
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MOVW 0(R2), R0
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MOVW $1, R1
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BL cas<>(SB)
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BCC storeloop
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// Wait for setgid completion
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loop:
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MOVW $0, R0
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MOVW $0, R1
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BL cas<>(SB)
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BCC loop
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// Restore stack
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SUB $(1024 * 8), R13
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MOVW R4, R14
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RET
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