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Text file src/syscall/asm_unix_amd64.s

Documentation: syscall

     1	// +build netbsd freebsd openbsd dragonfly
     2	
     3	// Copyright 2009 The Go Authors. All rights reserved.
     4	// Use of this source code is governed by a BSD-style
     5	// license that can be found in the LICENSE file.
     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		MOVQ	$0, R10
    25		MOVQ	$0, R8
    26		MOVQ	$0, R9
    27		SYSCALL
    28		JCC	ok
    29		MOVQ	$-1, r1+32(FP)	// r1
    30		MOVQ	$0, r2+40(FP)	// r2
    31		MOVQ	AX, err+48(FP)	// errno
    32		CALL	runtime·exitsyscall(SB)
    33		RET
    34	ok:
    35		MOVQ	AX, r1+32(FP)	// r1
    36		MOVQ	DX, r2+40(FP)	// r2
    37		MOVQ	$0, err+48(FP)	// errno
    38		CALL	runtime·exitsyscall(SB)
    39		RET
    40	
    41	TEXT	·Syscall6(SB),NOSPLIT,$0-80
    42		CALL	runtime·entersyscall(SB)
    43		MOVQ	trap+0(FP), AX	// syscall entry
    44		MOVQ	a1+8(FP), DI
    45		MOVQ	a2+16(FP), SI
    46		MOVQ	a3+24(FP), DX
    47		MOVQ	a4+32(FP), R10
    48		MOVQ	a5+40(FP), R8
    49		MOVQ	a6+48(FP), R9
    50		SYSCALL
    51		JCC	ok6
    52		MOVQ	$-1, r1+56(FP)	// r1
    53		MOVQ	$0, r2+64(FP)	// r2
    54		MOVQ	AX, err+72(FP)  // errno
    55		CALL	runtime·exitsyscall(SB)
    56		RET
    57	ok6:
    58		MOVQ	AX, r1+56(FP)	// r1
    59		MOVQ	DX, r2+64(FP)	// r2
    60		MOVQ	$0, err+72(FP)	// errno
    61		CALL	runtime·exitsyscall(SB)
    62		RET
    63	
    64	TEXT	·RawSyscall(SB),NOSPLIT,$0-56
    65		MOVQ	a1+8(FP), DI
    66		MOVQ	a2+16(FP), SI
    67		MOVQ	a3+24(FP), DX
    68		MOVQ	$0, R10
    69		MOVQ	$0, R8
    70		MOVQ	$0, R9
    71		MOVQ	trap+0(FP), AX	// syscall entry
    72		SYSCALL
    73		JCC	ok1
    74		MOVQ	$-1, r1+32(FP)	// r1
    75		MOVQ	$0, r2+40(FP)	// r2
    76		MOVQ	AX, err+48(FP)	// errno
    77		RET
    78	ok1:
    79		MOVQ	AX, r1+32(FP)	// r1
    80		MOVQ	DX, r2+40(FP)	// r2
    81		MOVQ	$0, err+48(FP)	// errno
    82		RET
    83	
    84	TEXT	·RawSyscall6(SB),NOSPLIT,$0-80
    85		MOVQ	a1+8(FP), DI
    86		MOVQ	a2+16(FP), SI
    87		MOVQ	a3+24(FP), DX
    88		MOVQ	a4+32(FP), R10
    89		MOVQ	a5+40(FP), R8
    90		MOVQ	a6+48(FP), R9
    91		MOVQ	trap+0(FP), AX	// syscall entry
    92		SYSCALL
    93		JCC	ok2
    94		MOVQ	$-1, r1+56(FP)	// r1
    95		MOVQ	$0, r2+64(FP)	// r2
    96		MOVQ	AX, err+72(FP)	// errno
    97		RET
    98	ok2:
    99		MOVQ	AX, r1+56(FP)	// r1
   100		MOVQ	DX, r2+64(FP)	// r2
   101		MOVQ	$0, err+72(FP)	// errno
   102		RET

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