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Copy pathasm_plan9_amd64.s
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asm_plan9_amd64.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 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 */
TEXT ·Syscall(SB),NOSPLIT,$168-64
NO_LOCAL_POINTERS
CALL runtime·entersyscall<ABIInternal>(SB)
MOVQ trap+0(FP), BP // syscall entry
// copy args down
LEAQ a1+8(FP), SI
LEAQ sysargs-160(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+32(FP)
MOVQ $0, r2+40(FP)
CMPL AX, $-1
JNE ok3
LEAQ errbuf-128(SP), AX
MOVQ AX, sysargs-160(SP)
MOVQ $128, sysargs1-152(SP)
MOVQ $SYS_ERRSTR, BP
SYSCALL
CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
MOVQ sysargs-160(SP), AX
MOVQ AX, errbuf-168(SP)
CALL runtime·gostring(SB)
LEAQ str-160(SP), SI
JMP copyresult3
ok3:
CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
LEAQ ·emptystring(SB), SI
copyresult3:
LEAQ err+48(FP), DI
CLD
MOVSQ
MOVSQ
RET
TEXT ·Syscall6(SB),NOSPLIT,$168-88
NO_LOCAL_POINTERS
CALL runtime·entersyscall<ABIInternal>(SB)
MOVQ trap+0(FP), BP // syscall entry
// copy args down
LEAQ a1+8(FP), SI
LEAQ sysargs-160(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+56(FP)
MOVQ $0, r2+64(FP)
CMPL AX, $-1
JNE ok4
LEAQ errbuf-128(SP), AX
MOVQ AX, sysargs-160(SP)
MOVQ $128, sysargs1-152(SP)
MOVQ $SYS_ERRSTR, BP
SYSCALL
CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
MOVQ sysargs-160(SP), AX
MOVQ AX, errbuf-168(SP)
CALL runtime·gostring(SB)
LEAQ str-160(SP), SI
JMP copyresult4
ok4:
CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
LEAQ ·emptystring(SB), SI
copyresult4:
LEAQ err+72(FP), DI
CLD
MOVSQ
MOVSQ
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVQ trap+0(FP), BP // syscall entry
// slide args down on top of system call number
LEAQ a1+8(FP), SI
LEAQ trap+0(FP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+32(FP)
MOVQ AX, r2+40(FP)
MOVQ AX, err+48(FP)
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOVQ trap+0(FP), BP // syscall entry
// slide args down on top of system call number
LEAQ a1+8(FP), SI
LEAQ trap+0(FP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+56(FP)
MOVQ AX, r2+64(FP)
MOVQ AX, err+72(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,$48-56
NO_LOCAL_POINTERS
LEAQ newoffset+32(FP), AX
MOVQ AX, placeholder+0(FP)
// copy args down
LEAQ placeholder+0(FP), SI
LEAQ sysargs-40(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVQ $SYS_SEEK, BP // syscall entry
SYSCALL
CMPL AX, $-1
JNE ok6
MOVQ AX, newoffset+32(FP)
CALL syscall·errstr(SB)
MOVQ SP, SI
JMP copyresult6
ok6:
LEAQ ·emptystring(SB), SI
copyresult6:
LEAQ err+40(FP), DI
CLD
MOVSQ
MOVSQ
RET