Mercurial > hg > CbC > CbC_gcc

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