source: rtems/cpukit/score/cpu/riscv32/riscv-context-volatile-clobber.S @ 660db8c8

5
Last change on this file since 660db8c8 was 660db8c8, checked in by Hesham Almatary <hesham@…>, on Oct 26, 2017 at 11:12:41 PM

cpukit: Add basic riscv32 architecture port v3

Limitations:

  • NO FPU support [TODO]

Update #3109

  • Property mode set to 100644
File size: 1.7 KB
Line 
1/*
2 * Copyright (c) 2015 Hesham Almatary <hesham@alumni.york.ac.uk>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#ifdef HAVE_CONFIG_H
27#include "config.h"
28#endif
29
30#include <rtems/asm.h>
31
32.section .text
33
34PUBLIC(_CPU_Context_volatile_clobber)
35SYM(_CPU_Context_volatile_clobber):
36
37  .macro clobber_register reg
38  addi t0, t0, -1
39  mv  \reg, t0
40  .endm
41
42  clobber_register  a0
43  clobber_register  a1
44  clobber_register  a2
45  clobber_register  a3
46  clobber_register  a4
47  clobber_register  a5
48  clobber_register  a6
49
50  ret
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