github.com/mtsmfm/go/src@v0.0.0-20221020090648-44bdcb9f8fde/runtime/internal/syscall/asm_linux_riscv64.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  // func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
     8  TEXT ·Syscall6(SB),NOSPLIT,$0-80
     9  	MOV	num+0(FP), A7	// syscall entry
    10  	MOV	a1+8(FP), A0
    11  	MOV	a2+16(FP), A1
    12  	MOV	a3+24(FP), A2
    13  	MOV	a4+32(FP), A3
    14  	MOV	a5+40(FP), A4
    15  	MOV	a6+48(FP), A5
    16  	ECALL
    17  	MOV	$-4096, T0
    18  	BLTU	T0, A0, err
    19  	MOV	A0, r1+56(FP)
    20  	MOV	A1, r2+64(FP)
    21  	MOV	ZERO, errno+72(FP)
    22  	RET
    23  err:
    24  	MOV	$-1, T0
    25  	MOV	T0, r1+56(FP)
    26  	MOV	ZERO, r2+64(FP)
    27  	SUB	A0, ZERO, A0
    28  	MOV	A0, errno+72(FP)
    29  	RET