1/*        $NetBSD: cerror.S,v 1.21 2022/12/03 14:04:39 skrll Exp $    */
2
3/*-
4 * Copyright (c) 1991, 1993
5 *        The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ralph Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include "SYS.h"
36
37#if defined(LIBC_SCCS) && !defined(lint)
38#if 0
39          RCSID("from: @(#)cerror.s     8.1 (Berkeley) 6/16/93")
40#else
41          RCSID("$NetBSD: cerror.S,v 1.21 2022/12/03 14:04:39 skrll Exp $")
42#endif
43#endif /* LIBC_SCCS and not lint */
44
45#ifdef __PIC__
46          .protected          __cerror
47#endif
48
49#ifdef _REENTRANT
50          .globl    _C_LABEL(__errno)
51NESTED_NOPROFILE(__cerror, CALLFRAME_SIZ, ra)
52          .mask     0x80000000, (CALLFRAME_RA - CALLFRAME_SIZ)
53          PIC_PROLOGUE(__cerror)                  # saves caller gp in t3 (n32/n64)
54          PTR_SUBU  sp, CALLFRAME_SIZ
55          PTR_S               ra, CALLFRAME_RA(sp)
56          INT_S               v0, CALLFRAME_S0(sp)          # save errno value
57#if defined(__mips_n32) || defined(__mips_n64)
58          PTR_S               t3, CALLFRAME_GP(sp)          # save caller gp (in t3)
59#endif
60
61          SAVE_GP(CALLFRAME_GP)
62
63          PTR_LA              t9, _C_LABEL(__errno)         # locate address of errno
64
65          jalr                t9                            # __errno()
66
67#if defined(__mips_n32) || defined(__mips_n64)
68          PTR_L               gp, CALLFRAME_GP(sp)          # restore caller gp
69#endif
70          INT_L               t0, CALLFRAME_S0(sp)
71          PTR_L               ra, CALLFRAME_RA(sp)
72          INT_S               t0, 0(v0)           # update errno value
73          PTR_ADDU  sp, CALLFRAME_SIZ
74          li                  v0, -1
75          li                  v1, -1
76
77          # Note we don't use PIC_RETURN() here as the GP is stored
78          # on the stack and not in the t3 reg (for the n32/n64 case).
79          j                   ra
80END(__cerror)
81#else
82          .globl    _C_LABEL(errno)
83LEAF_NOPROFILE(__cerror)
84          PIC_PROLOGUE(__cerror)
85          INT_S               v0, _C_LABEL(errno)
86          li                  v0, -1
87          li                  v1, -1
88          PIC_RETURN()
89END(__cerror)
90#endif /* _REENTRANT */
91