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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children 74dbf4c3f2e1
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1 /*==========================================================================
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2 //
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3 // hal_misc.c
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4 //
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5 // HAL miscellaneous functions
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6 //
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7 //==========================================================================
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): nickg, gthomas
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44 // Contributors: nickg, gthomas
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45 // Date: 1999-02-20
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46 // Purpose: HAL miscellaneous functions
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47 // Description: This file contains miscellaneous functions provided by the
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48 // HAL.
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //=========================================================================*/
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53
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54 #include <pkgconf/hal.h>
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55 #include <pkgconf/hal_frv.h>
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56 #ifdef CYGPKG_KERNEL
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57 #include <pkgconf/kernel.h>
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58 #endif
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59 #ifdef CYGPKG_CYGMON
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60 #include <pkgconf/cygmon.h>
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61 #endif
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62
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63 #include <cyg/infra/cyg_type.h>
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64 #include <cyg/infra/cyg_trac.h> // tracing macros
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65 #include <cyg/infra/cyg_ass.h> // assertion macros
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66 #include <cyg/infra/diag.h>
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67
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68 #include <cyg/hal/hal_arch.h> // HAL header
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69 #include <cyg/hal/hal_intr.h> // HAL header
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70 #include <cyg/hal/hal_cache.h> // HAL header
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71
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72 /*------------------------------------------------------------------------*/
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73 /* First level C exception handler. */
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74
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75 externC void __handle_exception (void);
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76
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77 externC HAL_SavedRegisters *_hal_registers;
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78 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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79 // Historical - this datum is defined by the GDB stubs if present
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80 externC
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81 #endif
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82 void* volatile __mem_fault_handler;
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83
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84 #if 0
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85 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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86 /* Force exception handling into the GDB stubs. This is done by taking over
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87 the exception vectors while executing in the stubs. This allows for the
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88 debugged program to handle exceptions itself, except while the GDB
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89 processing is underway. The only vector that can't be handled this way
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90 is the illegal instruction vector which is used for breakpoint/single-step
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91 and must be maintained by the stubs at all times.
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92 Note: the interrupt vectors are _not_ preempted as the stubs probably can't
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93 handle them properly.
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94 */
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95
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96 #define ARM_VECTORS 8
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97 extern unsigned long vectors[]; // exception vectors as defined by the stubs
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98
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99 #if !defined(CYGPKG_CYGMON)
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100 static unsigned long *hardware_vectors = (unsigned long *)0x20;
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101 static unsigned long hold_vectors[ARM_VECTORS];
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102 static int exception_level;
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103
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104 static void
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105 __take_over_debug_traps(void)
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106 {
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107 hold_vectors[CYGNUM_HAL_VECTOR_ABORT_PREFETCH] = hardware_vectors[CYGNUM_HAL_VECTOR_ABORT_PREFETCH];
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108 hardware_vectors[CYGNUM_HAL_VECTOR_ABORT_PREFETCH] = vectors[CYGNUM_HAL_VECTOR_ABORT_PREFETCH];
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109 hold_vectors[CYGNUM_HAL_VECTOR_ABORT_DATA] = hardware_vectors[CYGNUM_HAL_VECTOR_ABORT_DATA];
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110 hardware_vectors[CYGNUM_HAL_VECTOR_ABORT_DATA] = vectors[CYGNUM_HAL_VECTOR_ABORT_DATA];
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111 }
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112
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113 static void
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114 __restore_debug_traps(void)
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115 {
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116 hardware_vectors[CYGNUM_HAL_VECTOR_ABORT_PREFETCH] = hold_vectors[CYGNUM_HAL_VECTOR_ABORT_PREFETCH];
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117 hardware_vectors[CYGNUM_HAL_VECTOR_ABORT_DATA] = hold_vectors[CYGNUM_HAL_VECTOR_ABORT_DATA];
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118 }
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119 #endif // !CYGPKG_CYGMON
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120 #endif
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121
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122 #endif // if 0
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123
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124 void
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125 exception_handler(HAL_SavedRegisters *regs)
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126 {
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127 // Special case handler for code which has chosen to take care
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128 // of data exceptions (i.e. code which expects them to happen)
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129 // This is common in discovery code, e.g. checking for a particular
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130 // device which may generate an exception when probing if the
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131 // device is not present
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132 if (__mem_fault_handler &&
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133 regs->vector == CYGNUM_HAL_EXCEPTION_DATA_ACCESS) {
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134 regs->pc = (unsigned long)__mem_fault_handler;
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135 return; // Caught an exception inside stubs
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136 }
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137
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138 #if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS) && !defined(CYGPKG_CYGMON)
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139 //?? if (++exception_level == 1) __take_over_debug_traps();
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140
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141 _hal_registers = regs;
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142 __handle_exception();
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143
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144 //?? if (--exception_level == 0) __restore_debug_traps();
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145
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146 #elif defined(CYGPKG_KERNEL_EXCEPTIONS)
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147
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148 // We should decode the vector and pass a more appropriate
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149 // value as the second argument. For now we simply pass a
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150 // pointer to the saved registers. We should also divert
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151 // breakpoint and other debug vectors into the debug stubs.
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152
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153 cyg_hal_deliver_exception( regs->vector, (CYG_ADDRWORD)regs );
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154
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155 #else
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156
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157 CYG_FAIL("Exception!!!");
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158
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159 #endif
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160
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161 return;
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162 }
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163
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164 void hal_spurious_IRQ(HAL_SavedRegisters *regs) CYGBLD_ATTRIB_WEAK;
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165 void
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166 hal_spurious_IRQ(HAL_SavedRegisters *regs)
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167 {
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168 #if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)
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169 exception_handler(regs);
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170 #else
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171 CYG_FAIL("Spurious interrupt!!");
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172 #endif
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173 }
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174
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175 /*------------------------------------------------------------------------*/
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176 /* C++ support - run initial constructors */
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177
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178 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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179 cyg_bool cyg_hal_stop_constructors;
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180 #endif
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181
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182 typedef void (*pfunc) (void);
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183 extern pfunc __CTOR_LIST__[];
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184 extern pfunc __CTOR_END__[];
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185
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186 void
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187 cyg_hal_invoke_constructors (void)
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188 {
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189 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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190 static pfunc *p = &__CTOR_END__[-1];
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191
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192 cyg_hal_stop_constructors = 0;
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193 for (; p >= __CTOR_LIST__; p--) {
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194 (*p) ();
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195 if (cyg_hal_stop_constructors) {
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196 p--;
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197 break;
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198 }
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199 }
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200 #else
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201 pfunc *p;
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202
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203 for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--) {
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204 (*p) ();
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205 }
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206 #endif
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207 }
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208
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209 /*------------------------------------------------------------------------*/
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210 /* Architecture default ISR */
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211
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212 externC cyg_uint32
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213 hal_arch_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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214 {
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215 CYG_TRACE1(true, "Interrupt: %d", vector);
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216
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217 CYG_FAIL("Spurious Interrupt!!!");
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218 return 0;
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219 }
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220
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221 /*------------------------------------------------------------------------*/
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222 /* Idle thread action */
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223
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224 void
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225 hal_idle_thread_action( cyg_uint32 count )
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226 {
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227 }
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228
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229 /*-------------------------------------------------------------------------*/
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230 /* Misc functions */
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231
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232 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS__
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233 /* This function will generate a breakpoint exception. It is used at the
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234 beginning of a program to sync up with a debugger and can be used
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235 otherwise as a quick means to stop program execution and "break" into
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236 the debugger. */
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237
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238 void
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239 breakpoint(void)
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240 {
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241 HAL_BREAKPOINT(_breakinst);
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242 }
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243
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244
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245 /* This function returns the opcode for a 'trap' instruction. */
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246
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247 unsigned long
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248 __break_opcode (void)
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249 {
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250 return HAL_BREAKINST;
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251 }
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252 #endif
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253
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254 int
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255 hal_lsbindex(int mask)
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256 {
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257 int i;
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258 for (i = 0; i < 32; i++) {
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259 if (mask & (1<<i)) return (i);
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260 }
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261 return (-1);
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262 }
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263
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264 int
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265 hal_msbindex(int mask)
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266 {
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267 int i;
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268 for (i = 31; i >= 0; i--) {
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269 if (mask & (1<<i)) return (i);
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270 }
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271 return (-1);
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272 }
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273
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274 /*------------------------------------------------------------------------*/
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275 // EOF hal_misc.c