source: trunk/libs/newlib/src/libgloss/sparc_leon/regwin_patch.c @ 580

Last change on this file since 580 was 444, checked in by satin@…, 7 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 2.7 KB
Line 
1/*
2 * Copyright (c) 2011 Aeroflex Gaisler
3 *
4 * BSD license:
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25
26#include <asm-leon/leon.h>
27#include <asm-leon/leonstack.h>
28#include <asm-leon/asmmacro.h>
29
30extern volatile unsigned int __window_overflow_rettseq[3];
31extern volatile unsigned int __window_overflow_slow1[2];
32
33static unsigned int installed = 0;
34static unsigned int save__window_overflow_rettseq[3];
35
36int
37install_winoverflow_hook (void (*func) (void))
38{
39  if (installed)
40    {
41      return 0;
42    }
43  if (!installed)
44    {
45      /*
46         a7 50 00 00  rd  %wim, %l3
47         ae 10 00 01  mov  %g1, %l7
48         83 34 e0 01  srl  %l3, 1, %g1
49
50         81 c4 40 00  jmp  %l1
51         81 cc 80 00  rett  %l2 */
52      save__window_overflow_rettseq[0] = __window_overflow_rettseq[0];
53      save__window_overflow_rettseq[1] = __window_overflow_rettseq[1];
54      save__window_overflow_rettseq[2] = __window_overflow_rettseq[2];
55
56      /*29 10 00 31   sethi  %hi(0x4000c400), %l4
57         81 c5 22 48  jmp  %l4 + 0x248
58         01 00 00 00  nop  */
59
60      __window_overflow_rettseq[0] = ((((unsigned int) func) >> 10) & 0x3fffff) | 0x29000000;   /* upper 22 */
61      __window_overflow_rettseq[1] = ((((unsigned int) func)) & 0x03ff) | 0x81c52000;   /* lower 10 */
62      __window_overflow_rettseq[2] = 0x01000000;        /* nop */
63
64      sparc_leon23_icache_flush ();
65      installed = 1;
66    }
67  return 0;
68}
69
70void
71uninstall_winoverflow_hook ()
72{
73  if (installed)
74    {
75      __window_overflow_rettseq[0] = save__window_overflow_rettseq[0];
76      __window_overflow_rettseq[1] = save__window_overflow_rettseq[1];
77      __window_overflow_rettseq[2] = save__window_overflow_rettseq[2];
78
79      sparc_leon23_icache_flush ();
80      installed = 0;
81    }
82}
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