github.com/twelsh-aw/go/src@v0.0.0-20230516233729-a56fe86a7c81/runtime/internal/syscall/asm_linux_386.s (about)

     1  // Copyright 2022 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  
     7  // See ../sys_linux_386.s for the reason why we always use int 0x80
     8  // instead of the glibc-specific "CALL 0x10(GS)".
     9  #define INVOKE_SYSCALL	INT	$0x80
    10  
    11  // func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
    12  //
    13  // Syscall # in AX, args in BX CX DX SI DI BP, return in AX
    14  TEXT ·Syscall6(SB),NOSPLIT,$0-40
    15  	MOVL	num+0(FP), AX	// syscall entry
    16  	MOVL	a1+4(FP), BX
    17  	MOVL	a2+8(FP), CX
    18  	MOVL	a3+12(FP), DX
    19  	MOVL	a4+16(FP), SI
    20  	MOVL	a5+20(FP), DI
    21  	MOVL	a6+24(FP), BP
    22  	INVOKE_SYSCALL
    23  	CMPL	AX, $0xfffff001
    24  	JLS	ok
    25  	MOVL	$-1, r1+28(FP)
    26  	MOVL	$0, r2+32(FP)
    27  	NEGL	AX
    28  	MOVL	AX, errno+36(FP)
    29  	RET
    30  ok:
    31  	MOVL	AX, r1+28(FP)
    32  	MOVL	DX, r2+32(FP)
    33  	MOVL	$0, errno+36(FP)
    34  	RET