github.com/ader1990/go@v0.0.0-20140630135419-8c24447fa791/src/pkg/syscall/asm_nacl_amd64p32.s (about)

     1  // Copyright 2013 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  #include "../../cmd/ld/textflag.h"
     6  #include "../runtime/syscall_nacl.h"
     7  
     8  //
     9  // System call support for amd64, Native Client
    10  //
    11  
    12  #define NACL_SYSCALL(code) \
    13  	MOVL $(0x10000 + ((code)<<5)), AX; CALL AX
    14  
    15  #define NACL_SYSJMP(code) \
    16  	MOVL $(0x10000 + ((code)<<5)), AX; JMP AX
    17  
    18  TEXT syscall·Syscall(SB),NOSPLIT,$0-28
    19  	CALL	runtime·entersyscall(SB)
    20  	MOVL	trap+0(FP), AX
    21  	MOVL	a1+4(FP), DI
    22  	MOVL	a2+8(FP), SI
    23  	MOVL	a3+12(FP), DX
    24  	// more args would use CX, R8, R9
    25  	SHLL	$5, AX
    26  	ADDL	$0x10000, AX
    27  	CALL	AX
    28  	CMPL	AX, $0
    29  	JGE	ok
    30  	MOVL	$-1, r1+16(FP)
    31  	MOVL	$-1, r2+20(FP)
    32  	NEGL	AX
    33  	MOVL	AX, err+24(FP)
    34  	CALL	runtime·exitsyscall(SB)
    35  	RET
    36  ok:
    37  	MOVL	AX, r1+16(FP)
    38  	MOVL	DX, r2+20(FP)
    39  	MOVL	$0, err+24(FP)
    40  	CALL	runtime·exitsyscall(SB)
    41  	RET