github.com/s1s1ty/go@v0.0.0-20180207192209-104445e3140f/src/syscall/asm_nacl_386.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 "textflag.h"
     6  #include "funcdata.h"
     7  #include "../runtime/syscall_nacl.h"
     8  
     9  //
    10  // System call support for 386, Native Client
    11  //
    12  
    13  #define NACL_SYSCALL(code) \
    14  	MOVL $(0x10000 + ((code)<<5)), AX; CALL AX
    15  
    16  #define NACL_SYSJMP(code) \
    17  	MOVL $(0x10000 + ((code)<<5)), AX; JMP AX
    18  
    19  TEXT ·Syscall(SB),NOSPLIT,$12-28
    20  	NO_LOCAL_POINTERS
    21  	CALL	runtime·entersyscall(SB)
    22  	MOVL	trap+0(FP), AX
    23  	MOVL	a1+4(FP), BX
    24  	MOVL	BX, 0(SP)
    25  	MOVL	a2+8(FP), BX
    26  	MOVL	BX, 4(SP)
    27  	MOVL	a3+12(FP), BX
    28  	MOVL	BX, 8(SP)
    29  	SHLL	$5, AX
    30  	ADDL	$0x10000, AX
    31  	CALL	AX
    32  	CMPL	AX, $0
    33  	JGE	ok
    34  	MOVL	$-1, r1+16(FP)
    35  	MOVL	$-1, r2+20(FP)
    36  	NEGL	AX
    37  	MOVL	AX, err+24(FP)
    38  	CALL	runtime·exitsyscall(SB)
    39  	RET
    40  ok:
    41  	MOVL	AX, r1+16(FP)
    42  	MOVL	DX, r2+20(FP)
    43  	MOVL	$0, err+24(FP)
    44  	CALL	runtime·exitsyscall(SB)
    45  	RET