asm_linux_riscv64.s raw

   1  // Copyright 2019 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  //
   8  // System calls for riscv64, Linux
   9  //
  10  
  11  // func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
  12  TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-48
  13  	MOV	a1+8(FP), A0
  14  	MOV	a2+16(FP), A1
  15  	MOV	a3+24(FP), A2
  16  	MOV	ZERO, A3
  17  	MOV	ZERO, A4
  18  	MOV	ZERO, A5
  19  	MOV	trap+0(FP), A7	// syscall entry
  20  	ECALL
  21  	MOV	$-4096, T0
  22  	BLTU	T0, A0, err
  23  	MOV	A0, r1+32(FP)	// r1
  24  	MOV	ZERO, err+40(FP)	// errno
  25  	RET
  26  err:
  27  	MOV	$-1, T0
  28  	MOV	T0, r1+32(FP)	// r1
  29  	SUB	A0, ZERO, A0
  30  	MOV	A0, err+40(FP)	// errno
  31  	RET
  32  
  33  TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
  34  	MOV	a1+8(FP), A0
  35  	MOV	a2+16(FP), A1
  36  	MOV	a3+24(FP), A2
  37  	MOV	trap+0(FP), A7	// syscall entry
  38  	ECALL
  39  	MOV	A0, r1+32(FP)
  40  	MOV	A1, r2+40(FP)
  41  	RET
  42