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1 /*========================================================================== |
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2 // |
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3 // dbg-thread-demux.c |
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4 // |
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5 // GDB Stub ROM system calls |
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6 // |
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7 //========================================================================== |
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8 //####COPYRIGHTBEGIN#### |
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9 // |
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10 // ------------------------------------------- |
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11 // The contents of this file are subject to the Cygnus eCos Public License |
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12 // Version 1.0 (the "License"); you may not use this file except in |
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13 // compliance with the License. You may obtain a copy of the License at |
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14 // http://sourceware.cygnus.com/ecos |
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15 // |
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16 // Software distributed under the License is distributed on an "AS IS" |
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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18 // License for the specific language governing rights and limitations under |
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19 // the License. |
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20 // |
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21 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //========================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): nickg |
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33 // Contributors: |
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34 // Date: 1998-09-03 |
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35 // Purpose: GDB Stub ROM system calls |
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36 // Description: |
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37 // |
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38 //####DESCRIPTIONEND#### |
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39 // |
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40 //========================================================================*/ |
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41 |
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42 |
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43 /* This file implements system calls out from the ROM debug stub into |
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44 the operating environment. |
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45 We assume they exist in the same address space. |
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46 This file should be linked into your operating environment, your O.S. |
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47 or whatever is managing multiple saved process contexts. |
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48 Your O.S. needs to implement and provide |
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49 dbg_thread_capabilities |
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50 dbg_currthread |
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51 dbg_threadlist |
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52 dbg_threadinfo |
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53 dbg_getthreadreg |
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54 dbg_setthreadreg |
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55 |
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56 The debug stub will call this function by calling it indirectly |
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57 vis a pre-assigned location possably somthing like a virtual vector table. |
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58 Where this is exactly is platform specific. |
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59 |
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60 The O.S. should call patch_dbg_syscalls() and pass the address of the |
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61 location to be patched with the dbg_thread_syscall_rmt function. |
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62 Nothing really calls this by name. |
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63 |
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64 This scheme would also work if we wanted to use a real trapped system call. |
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65 */ |
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66 |
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67 // ------------------------------------------------------------------------- |
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68 |
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69 #include <pkgconf/kernel.h> |
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70 |
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71 #include "cyg/hal/dbg-threads-api.h" |
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72 #include "dbg-thread-syscall.h" |
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73 |
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74 // ------------------------------------------------------------------------- |
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75 |
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76 static int dbg_thread_syscall_rmt( |
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77 enum dbg_syscall_ids id, |
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78 union dbg_thread_syscall_parms * p |
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79 ) |
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80 { |
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81 switch (id) |
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82 { |
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83 case dbg_null_func : return 1 ; /* test the syscall apparatus */ |
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84 |
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85 #ifdef CYGDBG_KERNEL_DEBUG_GDB_THREAD_SUPPORT |
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86 case dbg_capabilities_func : |
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87 return dbg_thread_capabilities(p->cap_parms.abilities) ; |
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88 break ; |
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89 case dbg_currthread_func : |
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90 return dbg_currthread(p->currthread_parms.ref) ; |
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91 break ; |
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92 case dbg_threadlist_func : |
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93 return dbg_threadlist(p->threadlist_parms.startflag, |
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94 p->threadlist_parms.lastid, |
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95 p->threadlist_parms.nextthreadid) ; |
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96 break ; |
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97 case dbg_threadinfo_func : |
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98 return dbg_threadinfo(p->info_parms.ref, |
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99 p->info_parms.info |
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100 ) ; |
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101 break ; |
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102 case dbg_getthreadreg_func : |
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103 return dbg_getthreadreg(p->reg_parms.thread, |
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104 p->reg_parms.regcount, |
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105 p->reg_parms.registers) ; |
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106 break ; |
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107 case dbg_setthreadreg_func : |
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108 return dbg_setthreadreg(p->reg_parms.thread, |
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109 p->reg_parms.regcount, |
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110 p->reg_parms.registers) ; |
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111 break ; |
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112 #endif /* CYGDBG_KERNEL_DEBUG_GDB_THREAD_SUPPORT */ |
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113 default : |
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114 return 0 ; /* failure tue to non-implementation */ |
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115 } |
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116 } |
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117 |
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118 // ------------------------------------------------------------------------- |
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119 // When Cygmon calls us on the TX39 It has its own value in GP. We need to |
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120 // save that and set our own before proceeding. |
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121 |
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122 #ifdef CYG_HAL_TX39 |
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123 static int dbg_thread_syscall_rmt_1( |
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124 enum dbg_syscall_ids id, |
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125 union dbg_thread_syscall_parms * p |
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126 ) |
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127 { |
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128 |
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129 register long gp_save; |
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130 int r; |
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131 asm ( "move %0,$28;" |
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132 ".extern _gp;" |
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133 "la $gp,_gp;" |
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134 : "=r"(gp_save) |
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135 ); |
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136 |
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137 r = dbg_thread_syscall_rmt( id, p ); |
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138 |
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139 asm ( "move $gp,%0;" :: "r"(gp_save) ); |
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140 |
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141 return r; |
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142 |
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143 } |
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144 #endif |
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145 |
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146 // ------------------------------------------------------------------------- |
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147 |
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148 void patch_dbg_syscalls(void * vector) |
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149 { |
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150 dbg_syscall_func * f ; |
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151 f = vector ; |
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152 #ifdef CYG_HAL_TX39 |
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153 *f = dbg_thread_syscall_rmt_1 ; |
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154 #else |
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155 *f = dbg_thread_syscall_rmt ; |
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156 #endif |
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157 } |
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158 |
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159 // ------------------------------------------------------------------------- |
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160 // End of dbg-thread-demux.c |
