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-rw-r--r--src/pkg/runtime/plan9/386/sys.s82
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diff --git a/src/pkg/runtime/plan9/386/sys.s b/src/pkg/runtime/plan9/386/sys.s
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+++ b/src/pkg/runtime/plan9/386/sys.s
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+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "defs.h"
+#include "386/asm.h"
+
+// setldt(int entry, int address, int limit)
+TEXT runtime·setldt(SB),7,$0
+ RET
+
+TEXT runtime·open(SB),7,$0
+ MOVL $14, AX
+ INT $64
+ RET
+
+TEXT runtime·write(SB),7,$0
+ MOVL $20, AX
+ INT $64
+ RET
+
+TEXT runtime·exits(SB),7,$0
+ MOVL $8, AX
+ INT $64
+ RET
+
+TEXT runtime·brk_(SB),7,$0
+ MOVL $24, AX
+ INT $64
+ RET
+
+TEXT runtime·plan9_semacquire(SB),7,$0
+ MOVL $37, AX
+ INT $64
+ RET
+
+TEXT runtime·plan9_semrelease(SB),7,$0
+ MOVL $38, AX
+ INT $64
+ RET
+
+TEXT runtime·rfork(SB),7,$0
+ MOVL $19, AX // rfork
+ INT $64
+
+ // In parent, return.
+ CMPL AX, $0
+ JEQ 2(PC)
+ RET
+
+ // In child on old stack.
+ MOVL mm+12(SP), BX // m
+ MOVL gg+16(SP), DX // g
+ MOVL fn+20(SP), SI // fn
+
+ // set SP to be on the new child stack
+ MOVL stack+8(SP), CX
+ MOVL CX, SP
+
+ // Initialize m, g.
+ get_tls(AX)
+ MOVL DX, g(AX)
+ MOVL BX, m(AX)
+
+ // Initialize AX from _tos->pid
+ MOVL _tos(SB), AX
+ MOVL tos_pid(AX), AX
+ MOVL AX, m_procid(BX) // save pid as m->procid
+
+ CALL runtime·stackcheck(SB) // smashes AX, CX
+
+ MOVL 0(DX), DX // paranoia; check they are not nil
+ MOVL 0(BX), BX
+
+ // more paranoia; check that stack splitting code works
+ PUSHAL
+ CALL runtime·emptyfunc(SB)
+ POPAL
+
+ CALL SI // fn()
+ CALL runtime·exit(SB)
+ RET