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1 /* |
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2 * Commpage syscalls |
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3 * |
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4 * Copyright (c) 2006 Pierre d'Herbemont |
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5 * |
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6 * This program is free software; you can redistribute it and/or modify |
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7 * it under the terms of the GNU General Public License as published by |
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8 * the Free Software Foundation; either version 2 of the License, or |
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9 * (at your option) any later version. |
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10 * |
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11 * This program is distributed in the hope that it will be useful, |
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 * GNU General Public License for more details. |
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15 * |
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16 * You should have received a copy of the GNU General Public License |
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17 * along with this program; if not, write to the Free Software |
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18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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19 */ |
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20 #include <fcntl.h> |
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21 #include <stdio.h> |
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22 #include <stdlib.h> |
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23 #include <errno.h> |
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24 |
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25 #include <mach/message.h> |
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26 #include <mach/mach.h> |
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27 #include <mach/mach_time.h> |
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28 #include <sys/time.h> |
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29 #include <sys/mman.h> |
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30 #include <libkern/OSAtomic.h> |
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31 |
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32 #include "qemu.h" |
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33 |
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34 //#define DEBUG_COMMPAGE |
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35 |
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36 #ifdef DEBUG_COMMPAGE |
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37 # define DPRINTF(...) do { if(loglevel) fprintf(logfile, __VA_ARGS__); printf(__VA_ARGS__); } while(0) |
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38 #else |
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39 # define DPRINTF(...) do { if(loglevel) fprintf(logfile, __VA_ARGS__); } while(0) |
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40 #endif |
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41 |
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42 /******************************************************************** |
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43 * Commpage definitions |
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44 */ |
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45 #ifdef TARGET_I386 |
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46 /* Reserve space for the commpage see xnu/osfmk/i386/cpu_capabilities.h */ |
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47 # define COMMPAGE_START (-16 * 4096) /* base address is -20 * 4096 */ |
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48 # define COMMPAGE_SIZE (0x1240) /* _COMM_PAGE_AREA_LENGTH is 19 * 4096 */ |
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49 #elif defined(TARGET_PPC) |
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50 /* Reserve space for the commpage see xnu/osfmk/ppc/cpu_capabilities.h */ |
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51 # define COMMPAGE_START (-8*4096) |
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52 # define COMMPAGE_SIZE (2*4096) /* its _COMM_PAGE_AREA_USED but _COMM_PAGE_AREA_LENGTH is 7*4096 */ |
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53 #endif |
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54 |
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55 void do_compare_and_swap32(void *cpu_env, int num); |
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56 void do_compare_and_swap64(void *cpu_env, int num); |
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57 void do_add_atomic_word32(void *cpu_env, int num); |
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58 void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1); |
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59 void do_nanotime(void *cpu_env, int num); |
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60 |
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61 void unimpl_commpage(void *cpu_env, int num); |
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62 |
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63 typedef void (*commpage_8args_function_t)(uint32_t arg1, uint32_t arg2, uint32_t arg3, |
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64 uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7, |
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65 uint32_t arg8); |
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66 typedef void (*commpage_indirect_function_t)(void *cpu_env, int num, uint32_t arg1, |
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67 uint32_t arg2, uint32_t arg3, uint32_t arg4, uint32_t arg5, |
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68 uint32_t arg6, uint32_t arg7, uint32_t arg8); |
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69 |
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70 #define HAS_PTR 0x10 |
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71 #define NO_PTR 0x20 |
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72 #define CALL_DIRECT 0x1 |
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73 #define CALL_INDIRECT 0x2 |
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74 |
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75 #define COMMPAGE_ENTRY(name, nargs, offset, func, options) \ |
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76 { #name, offset, nargs, options, (commpage_8args_function_t)func } |
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77 |
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78 struct commpage_entry { |
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79 char * name; |
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80 int offset; |
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81 int nargs; |
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82 char options; |
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83 commpage_8args_function_t function; |
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84 }; |
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85 |
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86 static inline int commpage_code_num(struct commpage_entry *entry) |
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87 { |
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88 if((entry->options & HAS_PTR)) |
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89 return entry->offset + 4; |
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90 else |
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91 return entry->offset; |
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92 } |
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93 |
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94 static inline int commpage_is_indirect(struct commpage_entry *entry) |
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95 { |
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96 return !(entry->options & CALL_DIRECT); |
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97 } |
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98 |
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99 /******************************************************************** |
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100 * Commpage entry |
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101 */ |
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102 static struct commpage_entry commpage_entries[] = |
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103 { |
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104 COMMPAGE_ENTRY(compare_and_swap32, 0, 0x080, do_compare_and_swap32, CALL_INDIRECT | HAS_PTR), |
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105 COMMPAGE_ENTRY(compare_and_swap64, 0, 0x0c0, do_compare_and_swap64, CALL_INDIRECT | HAS_PTR), |
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106 COMMPAGE_ENTRY(enqueue, 0, 0x100, unimpl_commpage, CALL_INDIRECT), |
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107 COMMPAGE_ENTRY(dequeue, 0, 0x140, unimpl_commpage, CALL_INDIRECT), |
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108 COMMPAGE_ENTRY(memory_barrier, 0, 0x180, unimpl_commpage, CALL_INDIRECT), |
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109 COMMPAGE_ENTRY(add_atomic_word32, 0, 0x1a0, do_add_atomic_word32, CALL_INDIRECT | HAS_PTR), |
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110 COMMPAGE_ENTRY(add_atomic_word64, 0, 0x1c0, unimpl_commpage, CALL_INDIRECT | HAS_PTR), |
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111 |
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112 COMMPAGE_ENTRY(mach_absolute_time, 0, 0x200, unimpl_commpage, CALL_INDIRECT), |
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113 COMMPAGE_ENTRY(spinlock_try, 1, 0x220, unimpl_commpage, CALL_INDIRECT), |
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114 COMMPAGE_ENTRY(spinlock_lock, 1, 0x260, OSSpinLockLock, CALL_DIRECT), |
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115 COMMPAGE_ENTRY(spinlock_unlock, 1, 0x2a0, OSSpinLockUnlock, CALL_DIRECT), |
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116 COMMPAGE_ENTRY(pthread_getspecific, 0, 0x2c0, unimpl_commpage, CALL_INDIRECT), |
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117 COMMPAGE_ENTRY(gettimeofday, 1, 0x2e0, do_cgettimeofday, CALL_INDIRECT), |
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118 COMMPAGE_ENTRY(sys_dcache_flush, 0, 0x4e0, unimpl_commpage, CALL_INDIRECT), |
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119 COMMPAGE_ENTRY(sys_icache_invalidate, 0, 0x520, unimpl_commpage, CALL_INDIRECT), |
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120 COMMPAGE_ENTRY(pthread_self, 0, 0x580, unimpl_commpage, CALL_INDIRECT), |
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121 |
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122 COMMPAGE_ENTRY(relinquish, 0, 0x5c0, unimpl_commpage, CALL_INDIRECT), |
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123 |
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124 #ifdef TARGET_I386 |
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125 COMMPAGE_ENTRY(bts, 0, 0x5e0, unimpl_commpage, CALL_INDIRECT), |
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126 COMMPAGE_ENTRY(btc, 0, 0x5f0, unimpl_commpage, CALL_INDIRECT), |
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127 #endif |
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128 |
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129 COMMPAGE_ENTRY(bzero, 2, 0x600, bzero, CALL_DIRECT), |
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130 COMMPAGE_ENTRY(bcopy, 3, 0x780, bcopy, CALL_DIRECT), |
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131 COMMPAGE_ENTRY(memcpy, 3, 0x7a0, memcpy, CALL_DIRECT), |
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132 |
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133 #ifdef TARGET_I386 |
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134 COMMPAGE_ENTRY(old_nanotime, 0, 0xf80, do_nanotime, CALL_INDIRECT), |
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135 COMMPAGE_ENTRY(memset_pattern, 0, 0xf80, unimpl_commpage, CALL_INDIRECT), |
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136 COMMPAGE_ENTRY(long_copy, 0, 0x1200, unimpl_commpage, CALL_INDIRECT), |
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137 |
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138 COMMPAGE_ENTRY(sysintegrity, 0, 0x1600, unimpl_commpage, CALL_INDIRECT), |
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139 |
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140 COMMPAGE_ENTRY(nanotime, 0, 0x1700, do_nanotime, CALL_INDIRECT), |
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141 #elif TARGET_PPC |
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142 COMMPAGE_ENTRY(compare_and_swap32b, 0, 0xf80, unimpl_commpage, CALL_INDIRECT), |
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143 COMMPAGE_ENTRY(compare_and_swap64b, 0, 0xfc0, unimpl_commpage, CALL_INDIRECT), |
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144 COMMPAGE_ENTRY(memset_pattern, 0, 0x1000, unimpl_commpage, CALL_INDIRECT), |
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145 COMMPAGE_ENTRY(bigcopy, 0, 0x1140, unimpl_commpage, CALL_INDIRECT), |
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146 #endif |
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147 }; |
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148 |
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149 |
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150 /******************************************************************** |
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151 * Commpage backdoor |
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152 */ |
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153 static inline void print_commpage_entry(struct commpage_entry entry) |
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154 { |
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155 printf("@0x%x %s\n", entry.offset, entry.name); |
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156 } |
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157 |
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158 static inline void install_commpage_backdoor_for_entry(struct commpage_entry entry) |
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159 { |
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160 #ifdef TARGET_I386 |
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161 char * commpage = (char*)(COMMPAGE_START+entry.offset); |
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162 int c = 0; |
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163 if(entry.options & HAS_PTR) |
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164 { |
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165 commpage[c++] = (COMMPAGE_START+entry.offset+4) & 0xff; |
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166 commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 8) & 0xff; |
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167 commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 16) & 0xff; |
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168 commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 24) & 0xff; |
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169 } |
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170 commpage[c++] = 0xcd; |
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171 commpage[c++] = 0x79; /* int 0x79 */ |
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172 commpage[c++] = 0xc3; /* ret */ |
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173 #else |
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174 qerror("can't install the commpage on this arch\n"); |
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175 #endif |
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176 } |
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177 |
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178 /******************************************************************** |
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179 * Commpage initialization |
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180 */ |
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181 void commpage_init(void) |
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182 { |
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183 #if (defined(__i386__) ^ defined(TARGET_I386)) || (defined(__powerpc__) ^ defined(TARGET_PPC)) |
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184 int i; |
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185 void * commpage = (void *)target_mmap( COMMPAGE_START, COMMPAGE_SIZE, |
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186 PROT_WRITE | PROT_READ, MAP_ANONYMOUS | MAP_FIXED, -1, 0); |
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187 if((int)commpage != COMMPAGE_START) |
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188 qerror("can't allocate the commpage\n"); |
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189 |
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190 bzero(commpage, COMMPAGE_SIZE); |
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191 |
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192 /* XXX: commpage data not handled */ |
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193 |
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194 for(i = 0; i < ARRAY_SIZE(commpage_entries); i++) |
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195 install_commpage_backdoor_for_entry(commpage_entries[i]); |
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196 #else |
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197 /* simply map our pages so they can be executed |
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198 XXX: we don't really want to do that since in the ppc on ppc situation we may |
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199 not able to run commpages host optimized instructions (like G5's on a G5), |
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200 hence this is sometimes a broken fix. */ |
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201 page_set_flags(COMMPAGE_START, COMMPAGE_START+COMMPAGE_SIZE, PROT_EXEC | PROT_READ | PAGE_VALID); |
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202 #endif |
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203 } |
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204 |
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205 /******************************************************************** |
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206 * Commpage implementation |
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207 */ |
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208 void do_compare_and_swap32(void *cpu_env, int num) |
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209 { |
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210 #ifdef TARGET_I386 |
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211 uint32_t old = ((CPUX86State*)cpu_env)->regs[R_EAX]; |
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212 uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_ECX]; |
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213 DPRINTF("commpage: compare_and_swap32(%x,new,%p)\n", old, value); |
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214 |
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215 if(value && old == tswap32(*value)) |
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216 { |
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217 uint32_t new = ((CPUX86State*)cpu_env)->regs[R_EDX]; |
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218 *value = tswap32(new); |
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219 /* set zf flag */ |
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220 ((CPUX86State*)cpu_env)->eflags |= 0x40; |
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221 } |
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222 else |
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223 { |
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224 ((CPUX86State*)cpu_env)->regs[R_EAX] = tswap32(*value); |
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225 /* unset zf flag */ |
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226 ((CPUX86State*)cpu_env)->eflags &= ~0x40; |
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227 } |
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228 #else |
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229 qerror("do_compare_and_swap32 unimplemented"); |
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230 #endif |
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231 } |
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232 |
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233 void do_compare_and_swap64(void *cpu_env, int num) |
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234 { |
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235 #ifdef TARGET_I386 |
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236 /* OSAtomicCompareAndSwap64 is not available on non 64 bits ppc, here is a raw implementation */ |
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237 uint64_t old, new, swapped_val; |
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238 uint64_t *value = (uint64_t*)((CPUX86State*)cpu_env)->regs[R_ESI]; |
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239 old = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_EDX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EAX]; |
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240 |
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241 DPRINTF("commpage: compare_and_swap64(%llx,new,%p)\n", old, value); |
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242 swapped_val = tswap64(*value); |
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243 |
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244 if(old == swapped_val) |
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245 { |
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246 new = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_ECX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EBX]; |
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247 *value = tswap64(new); |
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248 /* set zf flag */ |
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249 ((CPUX86State*)cpu_env)->eflags |= 0x40; |
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250 } |
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251 else |
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252 { |
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253 ((CPUX86State*)cpu_env)->regs[R_EAX] = (uint32_t)(swapped_val); |
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254 ((CPUX86State*)cpu_env)->regs[R_EDX] = (uint32_t)(swapped_val >> 32); |
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255 /* unset zf flag */ |
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256 ((CPUX86State*)cpu_env)->eflags &= ~0x40; |
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257 } |
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258 #else |
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259 qerror("do_compare_and_swap64 unimplemented"); |
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260 #endif |
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261 } |
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262 |
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263 void do_add_atomic_word32(void *cpu_env, int num) |
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264 { |
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265 #ifdef TARGET_I386 |
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266 uint32_t amt = ((CPUX86State*)cpu_env)->regs[R_EAX]; |
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267 uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_EDX]; |
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268 uint32_t swapped_value = tswap32(*value); |
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269 |
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270 DPRINTF("commpage: add_atomic_word32(%x,%p)\n", amt, value); |
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271 |
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272 /* old value in EAX */ |
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273 ((CPUX86State*)cpu_env)->regs[R_EAX] = swapped_value; |
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274 *value = tswap32(swapped_value + amt); |
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275 #else |
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276 qerror("do_add_atomic_word32 unimplemented"); |
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277 #endif |
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278 } |
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279 |
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280 void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1) |
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281 { |
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282 #ifdef TARGET_I386 |
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283 extern int __commpage_gettimeofday(struct timeval *); |
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284 DPRINTF("commpage: gettimeofday(0x%x)\n", arg1); |
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285 struct timeval *time = (struct timeval *)arg1; |
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286 int ret = __commpage_gettimeofday(time); |
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287 tswap32s((uint32_t*)&time->tv_sec); |
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288 tswap32s((uint32_t*)&time->tv_usec); |
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289 ((CPUX86State*)cpu_env)->regs[R_EAX] = ret; /* Success */ |
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290 #else |
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291 qerror("do_gettimeofday unimplemented"); |
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292 #endif |
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293 } |
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294 |
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295 void do_nanotime(void *cpu_env, int num) |
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296 { |
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297 #ifdef TARGET_I386 |
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298 uint64_t t = mach_absolute_time(); |
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299 ((CPUX86State*)cpu_env)->regs[R_EAX] = (int)(t & 0xffffffff); |
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300 ((CPUX86State*)cpu_env)->regs[R_EDX] = (int)((t >> 32) & 0xffffffff); |
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301 #else |
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302 qerror("do_nanotime unimplemented"); |
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303 #endif |
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304 } |
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305 |
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306 void unimpl_commpage(void *cpu_env, int num) |
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307 { |
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308 qerror("qemu: commpage function 0x%x not implemented\n", num); |
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309 } |
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310 |
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311 /******************************************************************** |
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312 * do_commpage - called by the main cpu loop |
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313 */ |
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314 void |
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315 do_commpage(void *cpu_env, int num, uint32_t arg1, uint32_t arg2, uint32_t arg3, |
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316 uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7, |
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317 uint32_t arg8) |
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318 { |
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319 int i, found = 0; |
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320 |
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321 arg1 = tswap32(arg1); |
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322 arg2 = tswap32(arg2); |
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323 arg3 = tswap32(arg3); |
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324 arg4 = tswap32(arg4); |
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325 arg5 = tswap32(arg5); |
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326 arg6 = tswap32(arg6); |
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327 arg7 = tswap32(arg7); |
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328 arg8 = tswap32(arg8); |
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329 |
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330 num = num-COMMPAGE_START-2; |
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331 |
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332 for(i = 0; i < ARRAY_SIZE(commpage_entries); i++) { |
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333 if( num == commpage_code_num(&commpage_entries[i]) ) |
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334 { |
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335 DPRINTF("commpage: %s %s\n", commpage_entries[i].name, commpage_is_indirect(&commpage_entries[i]) ? "[indirect]" : "[direct]"); |
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336 found = 1; |
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337 if(commpage_is_indirect(&commpage_entries[i])) |
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338 { |
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339 commpage_indirect_function_t function = (commpage_indirect_function_t)commpage_entries[i].function; |
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340 function(cpu_env, num, arg1, arg2, arg3, |
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341 arg4, arg5, arg6, arg7, arg8); |
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342 } |
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343 else |
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344 { |
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345 commpage_entries[i].function(arg1, arg2, arg3, |
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346 arg4, arg5, arg6, arg7, arg8); |
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347 } |
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348 break; |
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349 } |
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350 } |
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351 |
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352 if(!found) |
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353 { |
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354 gemu_log("qemu: commpage function 0x%x not defined\n", num); |
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355 gdb_handlesig (cpu_env, SIGTRAP); |
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356 exit(-1); |
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357 } |
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358 } |