root/src/pkg/syscall/asm_nacl_386.s

// Copyright 2013 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.

#include "../../cmd/ld/textflag.h"
#include "../runtime/syscall_nacl.h"

//
// System call support for 386, Native Client
//

#define NACL_SYSCALL(code) \
        MOVL $(0x10000 + ((code)<<5)), AX; CALL AX

#define NACL_SYSJMP(code) \
        MOVL $(0x10000 + ((code)<<5)), AX; JMP AX

TEXT syscall·Syscall(SB),NOSPLIT,$12-28
        CALL    runtime·entersyscall(SB)
        MOVL    trap+0(FP), AX
        MOVL    a1+4(FP), BX
        MOVL    BX, 0(SP)
        MOVL    a2+8(FP), BX
        MOVL    BX, 4(SP)
        MOVL    a3+12(FP), BX
        MOVL    BX, 8(SP)
        SHLL    $5, AX
        ADDL    $0x10000, AX
        CALL    AX
        CMPL    AX, $0
        JGE     ok
        MOVL    $-1, r1+16(FP)
        MOVL    $-1, r2+20(FP)
        NEGL    AX
        MOVL    AX, err+24(FP)
        CALL    runtime·exitsyscall(SB)
        RET
ok:
        MOVL    AX, r1+16(FP)
        MOVL    DX, r2+20(FP)
        MOVL    $0, err+24(FP)
        CALL    runtime·exitsyscall(SB)
        RET