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annotate packages/hal/m68k/arch/current/src/m68k_stub.c @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents c8ac62402c90
children
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1 //==========================================================================
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2 //
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3 // m68k_stub.c
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4 //
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5 // M68K gdb support
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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) 2003, 2008 Free Software Foundation, 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
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
211
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //###DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): bartv
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43 // Date: 2003-06-04
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44 //
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45 //###DESCRIPTIONEND####
211
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46 //========================================================================
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47
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48 #include <pkgconf/hal.h>
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49 #include <pkgconf/hal_m68k.h>
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50
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51 #include <cyg/infra/cyg_type.h>
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52 #include <cyg/infra/cyg_ass.h>
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53 #include <cyg/infra/diag.h>
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54 #include <cyg/hal/hal_arch.h>
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55 #include <cyg/hal/hal_intr.h>
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56 #include <cyg/hal/hal_if.h>
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57 #include <cyg/hal/hal_stub.h>
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58
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59 // Translate between the eCos save state and what is expected by the gdb
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60 // stubs. d0-d7/a0-a6 are in the right place already. SR/PS and the program
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61 // counter need to come from variant-specific macros. The stack pointer
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62 // can be determined from the saved context.
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63 externC void
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64 hal_get_gdb_registers(CYG_ADDRWORD* gdb_regs, HAL_SavedRegisters* ecos_regs)
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65 {
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66 int sr;
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67 int pc;
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68 int i;
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69 for (i = 0; i < 15; i++) {
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70 gdb_regs[i] = ecos_regs->da[i];
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71 }
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72 gdb_regs[15] = (CYG_ADDRWORD) &(ecos_regs[1]);
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73 HAL_CONTEXT_PCSR_GET_SR(ecos_regs, sr);
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74 HAL_CONTEXT_PCSR_GET_PC(ecos_regs, pc);
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75 gdb_regs[16] = sr;
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76 gdb_regs[17] = pc;
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77 }
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78
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79 externC void
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80 hal_set_gdb_registers(HAL_SavedRegisters* ecos_regs, CYG_ADDRWORD* gdb_regs)
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81 {
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82 int i;
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83 for (i = 0; i < 15; i++) {
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84 ecos_regs->da[i] = gdb_regs[i];
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85 }
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86 if (gdb_regs[15] != (CYG_ADDRWORD) &(ecos_regs[1])) {
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87 CYG_FAIL("gdb has requested a thread context switch - not supported,");
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88 }
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89 HAL_CONTEXT_PCSR_SET_SR(ecos_regs, gdb_regs[16]);
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90 HAL_CONTEXT_PCSR_SET_PC(ecos_regs, gdb_regs[17]);
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91 }
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92
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93 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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94
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95 externC int
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96 __computeSignal(unsigned int trap_number)
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97 {
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98 switch(trap_number) {
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99 case CYGNUM_HAL_EXCEPTION_DATA_ACCESS:
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100 return SIGBUS;
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101 case CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_ACCESS:
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102 case CYGNUM_HAL_EXCEPTION_SYSTEM_ERROR:
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103 return SIGSEGV;
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104 case CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION:
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105 return SIGILL;
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106 case CYGNUM_HAL_EXCEPTION_DIV_BY_ZERO:
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107 return SIGFPE;
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108 case CYGNUM_HAL_EXCEPTION_TRACE:
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109 case CYGNUM_HAL_VECTOR_TRAP0 ... CYGNUM_HAL_VECTOR_TRAP15:
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110 default:
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111 return SIGTRAP;
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112 }
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113 }
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114
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115 externC int
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116 __get_trap_number(void)
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117 {
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118 int result = CYGNUM_HAL_EXCEPTION_SYSTEM_ERROR;
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119 if ((HAL_SavedRegisters*)0 != _hal_registers) {
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120 HAL_CONTEXT_PCSR_GET_EXCEPTION(_hal_registers, result);
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121 }
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122 return result;
211
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123 }
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124
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125 externC void
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126 set_pc(target_register_t pc)
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127 {
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128 _registers[PC] = pc;
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129 }
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130
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131 // Single-stepping just involves setting the trace bit in the status register
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132 externC void
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133 __single_step(void)
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134 {
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135 _registers[PS] |= HAL_M68K_SR_T;
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136 }
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137
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138 externC void
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139 __clear_single_step(void)
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140 {
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141 _registers[PS] &= ~HAL_M68K_SR_T;
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142 }
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143
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144 // This breakpoint support is (probably) not needed because
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145 // single-stepping is supported instead.
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146 externC void
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147 __install_breakpoints(void)
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148 {
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149 }
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150
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151 externC void
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152 __clear_breakpoints(void)
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153 {
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154 }
211
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155
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156 externC int
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157 __is_breakpoint_function(void)
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158 {
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159 return _registers[PC] == (target_register_t)&_breakinst;
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160 }
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161
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162 // The 68K has variable length instructions so skipping an instruction
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163 // is messy. However __skipinst() is only used for a breakpoint
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164 // instruction or for a trap, and these are always 2 bytes.
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165 externC void
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166 __skipinst(void)
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167 {
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168 _registers[PC] += 2;
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169 }
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170
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171 #endif