github.com/c9s/go@v0.0.0-20180120015821-984e81f64e0c/src/syscall/asm_unix_386.s (about)

     1  // +build netbsd freebsd openbsd
     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 some 386 unixes
    12  //
    13  
    14  // func Syscall(trap int32, a1, a2, a3 int32) (r1, r2, err int32);
    15  // func Syscall6(trap int32, a1, a2, a3, a4, a5, a6 int32) (r1, r2, err int32);
    16  // Trap # in AX, args on stack above caller pc.
    17  
    18  TEXT	·Syscall(SB),NOSPLIT,$0-28
    19  	CALL	runtime·entersyscall(SB)
    20  	MOVL	trap+0(FP), AX	// syscall entry
    21  	// slide args down on top of system call number
    22  	LEAL		8(SP), SI
    23  	LEAL		4(SP), DI
    24  	CLD
    25  	MOVSL
    26  	MOVSL
    27  	MOVSL
    28  	INT	$0x80
    29  	JAE	ok
    30  	MOVL	$-1, r1+16(FP)	// r1
    31  	MOVL	$-1, r2+20(FP)	// r2
    32  	MOVL	AX, err+24(FP)	// errno
    33  	CALL	runtime·exitsyscall(SB)
    34  	RET
    35  ok:
    36  	MOVL	AX, r1+16(FP)	// r1
    37  	MOVL	DX, r2+20(FP)	// r2
    38  	MOVL	$0, err+24(FP)	// errno
    39  	CALL	runtime·exitsyscall(SB)
    40  	RET
    41  
    42  TEXT	·Syscall6(SB),NOSPLIT,$0-40
    43  	CALL	runtime·entersyscall(SB)
    44  	MOVL	trap+0(FP), AX	// syscall entry
    45  	// slide args down on top of system call number
    46  	LEAL		8(SP), SI
    47  	LEAL		4(SP), DI
    48  	CLD
    49  	MOVSL
    50  	MOVSL
    51  	MOVSL
    52  	MOVSL
    53  	MOVSL
    54  	MOVSL
    55  	INT	$0x80
    56  	JAE	ok6
    57  	MOVL	$-1, r1+28(FP)	// r1
    58  	MOVL	$-1, r2+32(FP)	// r2
    59  	MOVL	AX, err+36(FP)	// errno
    60  	CALL	runtime·exitsyscall(SB)
    61  	RET
    62  ok6:
    63  	MOVL	AX, r1+28(FP)	// r1
    64  	MOVL	DX, r2+32(FP)	// r2
    65  	MOVL	$0, err+36(FP)	// errno
    66  	CALL	runtime·exitsyscall(SB)
    67  	RET
    68  
    69  TEXT	·Syscall9(SB),NOSPLIT,$0-52
    70  	CALL	runtime·entersyscall(SB)
    71  	MOVL	num+0(FP), AX	// syscall entry
    72  	// slide args down on top of system call number
    73  	LEAL		8(SP), SI
    74  	LEAL		4(SP), DI
    75  	CLD
    76  	MOVSL
    77  	MOVSL
    78  	MOVSL
    79  	MOVSL
    80  	MOVSL
    81  	MOVSL
    82  	MOVSL
    83  	MOVSL
    84  	MOVSL
    85  	INT	$0x80
    86  	JAE	ok9
    87  	MOVL	$-1, r1+40(FP)	// r1
    88  	MOVL	$-1, r2+44(FP)	// r2
    89  	MOVL	AX, err+48(FP)	// errno
    90  	CALL	runtime·exitsyscall(SB)
    91  	RET
    92  ok9:
    93  	MOVL	AX, r1+40(FP)	// r1
    94  	MOVL	DX, r2+44(FP)	// r2
    95  	MOVL	$0, err+48(FP)	// errno
    96  	CALL	runtime·exitsyscall(SB)
    97  	RET
    98  
    99  TEXT ·RawSyscall(SB),NOSPLIT,$0-28
   100  	MOVL	trap+0(FP), AX	// syscall entry
   101  	// slide args down on top of system call number
   102  	LEAL		8(SP), SI
   103  	LEAL		4(SP), DI
   104  	CLD
   105  	MOVSL
   106  	MOVSL
   107  	MOVSL
   108  	INT	$0x80
   109  	JAE	ok1
   110  	MOVL	$-1, r1+16(FP)	// r1
   111  	MOVL	$-1, r2+20(FP)	// r2
   112  	MOVL	AX, err+24(FP)	// errno
   113  	RET
   114  ok1:
   115  	MOVL	AX, r1+16(FP)	// r1
   116  	MOVL	DX, r2+20(FP)	// r2
   117  	MOVL	$0, err+24(FP)	// errno
   118  	RET
   119  
   120  TEXT	·RawSyscall6(SB),NOSPLIT,$0-40
   121  	MOVL	trap+0(FP), AX	// syscall entry
   122  	// slide args down on top of system call number
   123  	LEAL		8(SP), SI
   124  	LEAL		4(SP), DI
   125  	CLD
   126  	MOVSL
   127  	MOVSL
   128  	MOVSL
   129  	MOVSL
   130  	MOVSL
   131  	MOVSL
   132  	INT	$0x80
   133  	JAE	ok2
   134  	MOVL	$-1, r1+28(FP)	// r1
   135  	MOVL	$-1, r2+32(FP)	// r2
   136  	MOVL	AX, err+36(FP)	// errno
   137  	RET
   138  ok2:
   139  	MOVL	AX, r1+28(FP)	// r1
   140  	MOVL	DX, r2+32(FP)	// r2
   141  	MOVL	$0, err+36(FP)	// errno
   142  	RET