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1 /* Provide the runtime infrastructure for the transactional memory lib.
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2 Copyright (C) 2011-2020 Free Software Foundation, Inc.
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3 Contributed by Iain Sandoe <iains@gcc.gnu.org>
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #include "tsystem.h"
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27 #include <stddef.h>
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28 #include <dlfcn.h>
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29 #include <mach-o/dyld.h>
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30 #include <mach-o/getsect.h>
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31
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32 #ifdef __LP64__
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33 #define GET_DATA_TMCT(mh,size) \
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34 getsectdatafromheader_64 ((struct mach_header_64*) mh, \
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35 "__DATA", "__tm_clone_table", (uint64_t *)size)
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36 #else
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37 #define GET_DATA_TMCT(mh,size) \
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38 getsectdatafromheader (mh, "__DATA", "__tm_clone_table", (uint32_t *)size)
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39 #endif
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40
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41 #define WEAK __attribute__((weak))
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42
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43 extern void _ITM_registerTMCloneTable (void *, size_t) WEAK;
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44 extern void _ITM_deregisterTMCloneTable (void *) WEAK;
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45
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46 #if defined(START) || defined(END)
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47 static inline void *getTMCloneTable (const void *f, size_t *tmct_siz)
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48 {
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49 char *tmct_fixed, *tmct = NULL;
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50 unsigned int i, img_count;
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51 struct mach_header *mh;
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52 Dl_info info;
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53
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54 if (! dladdr (f, &info) || info.dli_fbase == NULL)
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55 abort ();
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56
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57 mh = (struct mach_header *) info.dli_fbase;
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58 tmct_fixed = GET_DATA_TMCT (mh, tmct_siz);
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59 *tmct_siz /= (sizeof (size_t) * 2);
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60 /* No tm_clone_table or no clones. */
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61 if (tmct_fixed == NULL || *tmct_siz == 0)
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62 return NULL;
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63
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64 img_count = _dyld_image_count();
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65 for (i = 0; i < img_count && tmct == NULL; i++)
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66 {
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67 if (mh == _dyld_get_image_header(i))
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68 tmct = tmct_fixed + (unsigned long)_dyld_get_image_vmaddr_slide(i);
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69 }
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70
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71 return tmct;
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72 }
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73 #endif
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74
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75 #ifdef START
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76
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77 void __doTMRegistrations (void) __attribute__ ((constructor));
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78
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79 void __doTMRegistrations (void)
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80 {
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81 size_t tmct_siz;
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82 void *tmct;
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83
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84 tmct = getTMCloneTable ((const void *)&__doTMRegistrations, &tmct_siz);
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85 if (_ITM_registerTMCloneTable != NULL && tmct != NULL)
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86 _ITM_registerTMCloneTable (tmct, (size_t)tmct_siz);
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87 }
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88
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89 #endif
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90
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91 #ifdef END
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92
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93 void __doTMdeRegistrations (void) __attribute__ ((destructor));
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94
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95 void __doTMdeRegistrations (void)
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96 {
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97 size_t tmct_siz;
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98 void *tmct;
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99
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100 tmct = getTMCloneTable ((const void *)&__doTMdeRegistrations, &tmct_siz);
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101 if (_ITM_deregisterTMCloneTable != NULL && tmct != NULL)
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102 _ITM_deregisterTMCloneTable (tmct);
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103 }
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104
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105 #endif
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