asm_linux_mipsx.s raw

   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  //go:build linux && (mips || mipsle)
   6  
   7  #include "textflag.h"
   8  
   9  // func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
  10  //
  11  // The 5th and 6th arg go at sp+16, sp+20.
  12  // Note that frame size of 20 means that 24 bytes gets reserved on stack.
  13  TEXT ·Syscall6(SB),NOSPLIT,$20-40
  14  	MOVW	num+0(FP), R2	// syscall entry
  15  	MOVW	a1+4(FP), R4
  16  	MOVW	a2+8(FP), R5
  17  	MOVW	a3+12(FP), R6
  18  	MOVW	a4+16(FP), R7
  19  	MOVW	a5+20(FP), R8
  20  	MOVW	a6+24(FP), R9
  21  	MOVW	R8, 16(R29)
  22  	MOVW	R9, 20(R29)
  23  	MOVW	R0, R3	// reset R3 to 0 as 1-ret SYSCALL keeps it
  24  	SYSCALL
  25  	BEQ	R7, ok
  26  	MOVW	$-1, R1
  27  	MOVW	R1, r1+28(FP)
  28  	MOVW	R0, r2+32(FP)
  29  	MOVW	R2, errno+36(FP)
  30  	RET
  31  ok:
  32  	MOVW	R2, r1+28(FP)
  33  	MOVW	R3, r2+32(FP)
  34  	MOVW	R0, errno+36(FP)
  35  	RET
  36