github.com/m10x/go/src@v0.0.0-20220112094212-ba61592315da/syscall/asm_unix_amd64.s (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build dragonfly || freebsd || netbsd
     6  
     7  #include "textflag.h"
     8  #include "funcdata.h"
     9  
    10  //
    11  // System call support for AMD64 unixes
    12  //
    13  
    14  // func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64)
    15  // func Syscall6(trap int64, a1, a2, a3, a4, a5, a6 int64) (r1, r2, err int64)
    16  // Trap # in AX, args in DI SI DX, return in AX DX
    17  
    18  TEXT	·Syscall(SB),NOSPLIT,$0-56
    19  	CALL	runtime·entersyscall(SB)
    20  	MOVQ	trap+0(FP), AX	// syscall entry
    21  	MOVQ	a1+8(FP), DI
    22  	MOVQ	a2+16(FP), SI
    23  	MOVQ	a3+24(FP), DX
    24  	SYSCALL
    25  	JCC	ok
    26  	MOVQ	$-1, r1+32(FP)	// r1
    27  	MOVQ	$0, r2+40(FP)	// r2
    28  	MOVQ	AX, err+48(FP)	// errno
    29  	CALL	runtime·exitsyscall(SB)
    30  	RET
    31  ok:
    32  	MOVQ	AX, r1+32(FP)	// r1
    33  	MOVQ	DX, r2+40(FP)	// r2
    34  	MOVQ	$0, err+48(FP)	// errno
    35  	CALL	runtime·exitsyscall(SB)
    36  	RET
    37  
    38  TEXT	·Syscall6(SB),NOSPLIT,$0-80
    39  	CALL	runtime·entersyscall(SB)
    40  	MOVQ	trap+0(FP), AX	// syscall entry
    41  	MOVQ	a1+8(FP), DI
    42  	MOVQ	a2+16(FP), SI
    43  	MOVQ	a3+24(FP), DX
    44  	MOVQ	a4+32(FP), R10
    45  	MOVQ	a5+40(FP), R8
    46  	MOVQ	a6+48(FP), R9
    47  	SYSCALL
    48  	JCC	ok6
    49  	MOVQ	$-1, r1+56(FP)	// r1
    50  	MOVQ	$0, r2+64(FP)	// r2
    51  	MOVQ	AX, err+72(FP)  // errno
    52  	CALL	runtime·exitsyscall(SB)
    53  	RET
    54  ok6:
    55  	MOVQ	AX, r1+56(FP)	// r1
    56  	MOVQ	DX, r2+64(FP)	// r2
    57  	MOVQ	$0, err+72(FP)	// errno
    58  	CALL	runtime·exitsyscall(SB)
    59  	RET
    60  
    61  TEXT	·RawSyscall(SB),NOSPLIT,$0-56
    62  	MOVQ	a1+8(FP), DI
    63  	MOVQ	a2+16(FP), SI
    64  	MOVQ	a3+24(FP), DX
    65  	MOVQ	trap+0(FP), AX	// syscall entry
    66  	SYSCALL
    67  	JCC	ok1
    68  	MOVQ	$-1, r1+32(FP)	// r1
    69  	MOVQ	$0, r2+40(FP)	// r2
    70  	MOVQ	AX, err+48(FP)	// errno
    71  	RET
    72  ok1:
    73  	MOVQ	AX, r1+32(FP)	// r1
    74  	MOVQ	DX, r2+40(FP)	// r2
    75  	MOVQ	$0, err+48(FP)	// errno
    76  	RET
    77  
    78  TEXT	·RawSyscall6(SB),NOSPLIT,$0-80
    79  	MOVQ	a1+8(FP), DI
    80  	MOVQ	a2+16(FP), SI
    81  	MOVQ	a3+24(FP), DX
    82  	MOVQ	a4+32(FP), R10
    83  	MOVQ	a5+40(FP), R8
    84  	MOVQ	a6+48(FP), R9
    85  	MOVQ	trap+0(FP), AX	// syscall entry
    86  	SYSCALL
    87  	JCC	ok2
    88  	MOVQ	$-1, r1+56(FP)	// r1
    89  	MOVQ	$0, r2+64(FP)	// r2
    90  	MOVQ	AX, err+72(FP)	// errno
    91  	RET
    92  ok2:
    93  	MOVQ	AX, r1+56(FP)	// r1
    94  	MOVQ	DX, r2+64(FP)	// r2
    95  	MOVQ	$0, err+72(FP)	// errno
    96  	RET