// 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.
// TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP)
// so that go vet can check that they are correct.
#include "../../cmd/ld/textflag.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)
// Trap # in BP, args on stack above caller pc.
// NxM requires that Plan 9 system calls be
// marked with $0x8000 in AX.
TEXT ·Syscall(SB),NOSPLIT,$0-64
CALL runtime·entersyscall(SB)
MOVQ $0x8000, AX // for NxM
MOVQ 8(SP), BP // syscall entry
// slide args down on top of system call number
LEAQ 16(SP), SI
LEAQ 8(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+40(SP)
MOVQ $0, r2+48(SP)
CMPL AX, $-1
JNE ok3
SUBQ $16, SP
CALL runtime·errstr(SB)
MOVQ SP, SI
ADDQ $16, SP
JMP copyresult3
ok3:
LEAQ runtime·emptystring(SB), SI
copyresult3:
LEAQ err+56(SP), DI
CLD
MOVSQ
MOVSQ
CALL runtime·exitsyscall(SB)
RET
TEXT ·Syscall6(SB),NOSPLIT,$0-88
CALL runtime·entersyscall(SB)
MOVQ $0x8000, AX // for NxM
MOVQ 8(SP), BP // syscall entry
// slide args down on top of system call number
LEAQ 16(SP), SI
LEAQ 8(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+64(SP)
MOVQ $0, r2+72(SP)
CMPL AX, $-1
JNE ok4
SUBQ $16, SP
CALL runtime·errstr(SB)
MOVQ SP, SI
ADDQ $16, SP
JMP copyresult4
ok4:
LEAQ runtime·emptystring(SB), SI
copyresult4:
LEAQ err+80(SP), DI
CLD
MOVSQ
MOVSQ
CALL runtime·exitsyscall(SB)
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVQ $0x8000, AX // for NxM
MOVQ 8(SP), BP // syscall entry
// slide args down on top of system call number
LEAQ 16(SP), SI
LEAQ 8(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+40(SP)
MOVQ AX, r2+48(SP)
MOVQ AX, err+56(SP)
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOVQ $0x8000, AX // for NxM
MOVQ 8(SP), BP // syscall entry
// slide args down on top of system call number
LEAQ 16(SP), SI
LEAQ 8(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+64(SP)
MOVQ AX, r2+72(SP)
MOVQ AX, err+80(SP)
RET
#define SYS_SEEK 39 /* from zsysnum_plan9_amd64.go */
//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
TEXT ·seek(SB),NOSPLIT,$0-56
LEAQ newoffset+40(SP), AX
MOVQ AX, placeholder+8(SP)
MOVQ $0x8000, AX // for NxM
MOVQ $SYS_SEEK, BP // syscall entry
SYSCALL
CMPL AX, $-1
JNE ok6
MOVQ $-1, newoffset+40(SP)
SUBQ $16, SP
CALL syscall·errstr(SB)
MOVQ SP, SI
ADDQ $16, SP
JMP copyresult6
ok6:
LEAQ runtime·emptystring(SB), SI
copyresult6:
LEAQ err+48(SP), DI
CLD
MOVSQ
MOVSQ
RET
//func exit(code int)
// Import runtime·exit for cleanly exiting.
TEXT ·exit(SB),NOSPLIT,$8-8
MOVQ code+0(FP), AX
MOVQ AX, 0(SP)
CALL runtime·exit(SB)
RET