Mercurial > hg > CbC > CbC_gcc

comparison gcc/config/mep/mep-tramp.c @ 55:77e2b8dfacca gcc-4.4.5

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update it from 4.4.3 to 4.5.0
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Fri, 12 Feb 2010 23:39:51 +0900
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52:c156f1bd5cd9 55:77e2b8dfacca
1 /* Trampoline support for MeP
2 Copyright (C) 2004, 2007 Free Software Foundation, Inc.
3 Contributed by Red Hat Inc.
4
5 This file is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 3 of the License, or (at your
8 option) any later version.
9
10 This file is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 Under Section 7 of GPL version 3, you are granted additional
16 permissions described in the GCC Runtime Library Exception, version
17 3.1, as published by the Free Software Foundation.
18
19 You should have received a copy of the GNU General Public License and
20 a copy of the GCC Runtime Library Exception along with this program;
21 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
22 <http://www.gnu.org/licenses/>. */
23
24 /*
25 7a0a ldc $10,$pc
26 c0ae000a lw $0,10($10)
27 caae000e lw $10,14($10)
28 10ae jmp $10
29 00000000 static chain
30 00000000 function address
31 */
32
33 static inline int
34 cache_config_register(void) {
35 int rv;
36 asm ("ldc\t%0, $ccfg" : "=r" (rv));
37 return rv;
38 }
39
40 #define ICACHE_SIZE ((cache_config_register() >> 16) & 0x7f)
41 #define DCACHE_SIZE (cache_config_register() & 0x7f)
42
43 #define ICACHE_DATA_BASE 0x00300000
44 #define ICACHE_TAG_BASE 0x00310000
45 #define DCACHE_DATA_BASE 0x00320000
46 #define DCACHE_TAG_BASE 0x00330000
47
48 static inline void
49 flush_dcache (int addr)
50 {
51 asm volatile ("cache\t0, (%0)" : : "r" (addr));
52 }
53
54 void
55 __mep_trampoline_helper (unsigned long *tramp,
56 int function_address,
57 int static_chain);
58
59 void
60 __mep_trampoline_helper (unsigned long *tramp,
61 int function_address,
62 int static_chain)
63 {
64 int dsize, isize;
65
66 #ifdef __LITTLE_ENDIAN__
67 tramp[0] = 0xc0ae7a0a;
68 tramp[1] = 0xcaae000a;
69 tramp[2] = 0x10ae000e;
70 #else
71 tramp[0] = 0x7a0ac0ae;
72 tramp[1] = 0x000acaae;
73 tramp[2] = 0x000e10ae;
74 #endif
75 tramp[3] = static_chain;
76 tramp[4] = function_address;
77
78 dsize = DCACHE_SIZE;
79 isize = ICACHE_SIZE;
80
81 if (dsize)
82 {
83 flush_dcache ((int)tramp);
84 flush_dcache ((int)tramp+16);
85 }
86
87 if (isize)
88 {
89 int imask = (isize * 1024) - 1;
90 int tmask = ~imask;
91 unsigned int i;
92 volatile unsigned int *tags;
93
94 imask &= 0xffe0;
95
96 for (i=(unsigned int)tramp; i<(unsigned int)tramp+20; i+=16)
97 {
98 tags = (unsigned int *)(ICACHE_TAG_BASE + (i & imask));
99 if ((*tags & tmask) == (i & tmask))
100 *tags &= ~1;
101 }
102 }
103 }