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asm_plan9_386.s
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asm_plan9_386.s
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// Copyright 2009 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 "textflag.h"
#include "funcdata.h"
//
// System call support for 386, Plan 9
//
//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string)
//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string)
//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
#define SYS_ERRSTR 41 /* from zsysnum_plan9.go */
// Trap # in AX, args on stack above caller pc.
TEXT ·Syscall(SB),NOSPLIT,$148-32
NO_LOCAL_POINTERS
CALL runtime·entersyscall(SB)
MOVL trap+0(FP), AX // syscall entry
// copy args down
LEAL a1+4(FP), SI
LEAL sysargs-144(SP), DI
CLD
MOVSL
MOVSL
MOVSL
INT $64
MOVL AX, r1+16(FP)
MOVL $0, r2+20(FP)
CMPL AX, $-1
JNE ok3
LEAL errbuf-128(SP), AX
MOVL AX, sysargs-144(SP)
MOVL $128, sysargs1-140(SP)
MOVL $SYS_ERRSTR, AX
INT $64
CALL runtime·exitsyscall(SB)
MOVL sysargs-144(SP), AX
MOVL AX, errbuf-148(SP)
CALL runtime·gostring(SB)
LEAL str-144(SP), SI
JMP copyresult3
ok3:
CALL runtime·exitsyscall(SB)
LEAL ·emptystring(SB), SI
copyresult3:
LEAL err+24(FP), DI
CLD
MOVSL
MOVSL
RET
TEXT ·Syscall6(SB),NOSPLIT,$148-44
NO_LOCAL_POINTERS
CALL runtime·entersyscall(SB)
MOVL trap+0(FP), AX // syscall entry
// copy args down
LEAL a1+4(FP), SI
LEAL sysargs-144(SP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
INT $64
MOVL AX, r1+28(FP)
MOVL $0, r2+32(FP)
CMPL AX, $-1
JNE ok4
LEAL errbuf-128(SP), AX
MOVL AX, sysargs-144(SP)
MOVL $128, sysargs1-140(SP)
MOVL $SYS_ERRSTR, AX
INT $64
CALL runtime·exitsyscall(SB)
MOVL sysargs-144(SP), AX
MOVL AX, errbuf-148(SP)
CALL runtime·gostring(SB)
LEAL str-144(SP), SI
JMP copyresult4
ok4:
CALL runtime·exitsyscall(SB)
LEAL ·emptystring(SB), SI
copyresult4:
LEAL err+36(FP), DI
CLD
MOVSL
MOVSL
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-28
MOVL trap+0(FP), AX // syscall entry
// slide args down on top of system call number
LEAL a1+4(FP), SI
LEAL trap+0(FP), DI
CLD
MOVSL
MOVSL
MOVSL
INT $64
MOVL AX, r1+16(FP)
MOVL AX, r2+20(FP)
MOVL AX, err+24(FP)
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
MOVL trap+0(FP), AX // syscall entry
// slide args down on top of system call number
LEAL a1+4(FP), SI
LEAL trap+0(FP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
INT $64
MOVL AX, r1+28(FP)
MOVL AX, r2+32(FP)
MOVL AX, err+36(FP)
RET
#define SYS_SEEK 39 /* from zsysnum_plan9.go */
//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
TEXT ·seek(SB),NOSPLIT,$24-36
NO_LOCAL_POINTERS
LEAL newoffset+20(FP), AX
MOVL AX, placeholder+0(FP)
// copy args down
LEAL placeholder+0(FP), SI
LEAL sysargs-20(SP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVL $SYS_SEEK, AX // syscall entry
INT $64
CMPL AX, $-1
JNE ok6
MOVL AX, newoffset_lo+20(FP)
MOVL AX, newoffset_hi+24(FP)
CALL syscall·errstr(SB)
MOVL SP, SI
JMP copyresult6
ok6:
LEAL ·emptystring(SB), SI
copyresult6:
LEAL err+28(FP), DI
CLD
MOVSL
MOVSL
RET