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1 /* hal-stub.c - helper functions for stub, specific to ECC HAL |
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2 * |
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3 * Copyright (c) 1998 Cygnus Support |
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4 * |
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5 * The authors hereby grant permission to use, copy, modify, distribute, |
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6 * and license this software and its documentation for any purpose, provided |
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7 * that existing copyright notices are retained in all copies and that this |
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8 * notice is included verbatim in any distributions. No written agreement, |
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9 * license, or royalty fee is required for any of the authorized uses. |
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10 * Modifications to this software may be copyrighted by their authors |
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11 * and need not follow the licensing terms described here, provided that |
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12 * the new terms are clearly indicated on the first page of each file where |
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13 * they apply. |
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14 */ |
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15 |
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16 #include <stddef.h> |
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17 |
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18 //#include <signal.h> |
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19 //#include "board.h" |
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20 |
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21 #include <cyg/hal/hal_stub.h> |
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22 |
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23 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS |
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24 |
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25 #include <cyg/hal/hal_arch.h> |
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26 #include <cyg/hal/hal_io.h> |
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27 #include <cyg/hal/hal_diag.h> |
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28 #include <cyg/hal/hal_cache.h> |
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29 |
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30 /*---------------------------------------------------------------------------*/ |
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31 |
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32 #define DIAG_BASE 0xfffff300 |
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33 #define DIAG_SLCR (DIAG_BASE+0x00) |
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34 #define DIAG_SLSR (DIAG_BASE+0x04) |
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35 #define DIAG_SLDICR (DIAG_BASE+0x08) |
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36 #define DIAG_SLDISR (DIAG_BASE+0x0C) |
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37 #define DIAG_SFCR (DIAG_BASE+0x10) |
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38 #define DIAG_SBRG (DIAG_BASE+0x14) |
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39 #define DIAG_TFIFO (DIAG_BASE+0x20) |
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40 #define DIAG_RFIFO (DIAG_BASE+0x30) |
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41 |
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42 #define BRG_T0 0x0000 |
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43 #define BRG_T2 0x0100 |
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44 #define BRG_T4 0x0200 |
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45 #define BRG_T5 0x0300 |
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46 |
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47 /*---------------------------------------------------------------------------*/ |
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48 |
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49 /* External data */ |
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50 |
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51 extern int output_debug; /* dvemon.c */ |
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52 extern int (*read_vector) (int, char *, int); /* read.c */ |
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53 extern int (*write_vector) (int, char *, int); /* write.c */ |
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54 |
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55 /* External functions */ |
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56 |
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57 //int outbyte (unsigned char byte); /* dvemon.c */ |
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58 //unsigned char inbyte (); /* dvemon.c */ |
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59 //void general_exception (void); /* tx39-exc.S */ |
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60 |
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61 |
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62 /* Local data */ |
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63 |
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64 |
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65 /* If ENABLED is non-zero, supply a memory fault handler that traps |
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66 subsequent memory errors and sets _mem_err to 1. Otherwise, memory |
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67 faults are processed as exceptions. */ |
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68 |
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69 void __set_mem_fault_trap (int enable) {} |
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70 |
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71 static int serial_initialized = 0; |
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72 |
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73 static void serial_init() |
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74 { |
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75 //hal_diag_led(0x10); |
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76 HAL_WRITE_UINT16( DIAG_SLCR , 0x0020 ); |
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77 |
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78 HAL_WRITE_UINT16( DIAG_SLDICR , 0x0000 ); |
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79 |
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80 HAL_WRITE_UINT16( DIAG_SFCR , 0x0000 ); |
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81 |
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82 // HAL_WRITE_UINT16( DIAG_SBRG , BRG_T2 | 20 ); |
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83 // HAL_WRITE_UINT16( DIAG_SBRG , BRG_T2 | 10 ); |
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84 HAL_WRITE_UINT16( DIAG_SBRG , BRG_T2 | 5 ); |
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85 |
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86 serial_initialized = 1; |
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87 |
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88 //hal_diag_led(0x10); |
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89 } |
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90 |
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91 /* Write C to the current serial port. */ |
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92 |
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93 void putDebugChar (int c) |
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94 { |
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95 #ifdef CYG_HAL_MIPS_SIM |
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96 |
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97 #else |
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98 CYG_WORD16 disr; |
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99 |
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100 //hal_diag_led(0x20); |
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101 |
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102 if( !serial_initialized ) serial_init(); |
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103 |
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104 for(;;) |
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105 { |
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106 HAL_READ_UINT16( DIAG_SLDISR , disr ); |
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107 |
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108 if( disr & 0x0002 ) break; |
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109 } |
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110 |
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111 disr = disr & ~0x0002; |
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112 |
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113 HAL_WRITE_UINT8( DIAG_TFIFO, c ); |
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114 |
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115 HAL_WRITE_UINT16( DIAG_SLDISR , disr ); |
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116 |
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117 //hal_diag_led(0x20); |
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118 // HAL_DIAG_WRITE_CHAR( c ); |
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119 #endif |
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120 } |
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121 |
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122 /* Read one character from the current serial port. */ |
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123 |
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124 int getDebugChar (void) |
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125 { |
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126 #ifdef CYG_HAL_MIPS_SIM |
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127 static char input[] = "+$s#73"; |
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128 static int i = 0; |
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129 return input[i++]; |
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130 #else |
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131 char c; |
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132 |
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133 CYG_WORD16 disr; |
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134 |
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135 if( !serial_initialized ) serial_init(); |
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136 |
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137 //hal_diag_led(0x40); |
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138 for(;;) |
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139 { |
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140 |
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141 HAL_READ_UINT16( DIAG_SLDISR , disr ); |
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142 |
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143 if( disr & 0x0001 ) break; |
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144 } |
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145 |
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146 disr = disr & ~0x0001; |
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147 |
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148 HAL_READ_UINT8( DIAG_RFIFO, c ); |
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149 |
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150 HAL_WRITE_UINT16( DIAG_SLDISR , disr ); |
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151 |
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152 //hal_diag_led(0x40); |
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153 |
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154 // HAL_DIAG_READ_CHAR(c); |
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155 // diag_printf("<%02x:%c>",c); |
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156 |
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157 return c; |
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158 |
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159 #endif |
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160 } |
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161 |
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162 |
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163 /* Install the standard set of trap handlers for the stub. */ |
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164 |
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165 void __install_traps (void) |
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166 { |
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167 // Nothing to do, the HAL will call handle_exception when one occurs. |
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168 } |
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169 |
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170 /* Flush the instruction cache. */ |
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171 void flush_i_cache (void) { HAL_ICACHE_INVALIDATE_ALL(); } |
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172 |
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173 |
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174 /* Reset the board. */ |
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175 void __reset (void) {} |
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176 |
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177 |
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178 /* Set the baud rate for the current serial port. */ |
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179 void __set_baud_rate (int baud) {} |
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180 |
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181 |
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182 /* Initialize the hardware. */ |
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183 void initHardware (void) {} |
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184 |
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185 #if 0 |
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186 /* Alternate read function for use when stub is running. It |
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187 reads the data for standard input from the remote GDB. */ |
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188 |
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189 int dve_read (int fd, char *buf, int nbytes) |
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190 { |
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191 __get_gdb_input (buf, nbytes, 1); |
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192 } |
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193 |
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194 /* Alternate write function for use when stub is running. It |
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195 writes the data for standard output to the remote GDB. */ |
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196 |
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197 int dve_write (int fd, char *buf, int nbytes) |
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198 { |
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199 __output_gdb_string (buf, nbytes); |
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200 } |
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201 |
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202 #endif |
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203 |
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204 /* Install traps and otherwise initialize stub. */ |
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205 |
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206 void set_debug_traps (void) |
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207 { |
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208 // output_debug = 0; /* disable control-O prefixing on output */ |
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209 initialize_stub (); /* will call __install_traps and initHardware */ |
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210 // read_vector = dve_read; /* alternate read() function for stub */ |
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211 // write_vector = dve_write; /* alternate write() function for stub */ |
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212 } |
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213 |
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214 |
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215 /* This function will generate a breakpoint exception. It is used at the |
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216 beginning of a program to sync up with a debugger and can be used |
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217 otherwise as a quick means to stop program execution and "break" into |
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218 the debugger. */ |
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219 |
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220 void |
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221 breakpoint() |
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222 { |
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223 #ifdef CYG_HAL_MIPS_SIM |
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224 |
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225 // This code causes a fake breakpoint. |
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226 asm volatile ( |
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227 "lui $24,0x0000;" |
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228 "ori $24,0x0024;" |
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229 "mtc0 $24,$13;" |
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230 "lui $25,%%hi(1f);" |
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231 "ori $25,$25,%%lo(1f);" |
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232 "j other_vector;" |
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233 "nop;" |
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234 ".global _breakinst;" |
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235 "_breakinst:" |
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236 "1: nop;" |
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237 : |
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238 : |
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239 : "t8", "t9" |
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240 ); |
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241 |
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242 #else |
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243 |
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244 HAL_BREAKPOINT(_breakinst); |
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245 |
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246 #endif |
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247 |
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248 } |
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249 |
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250 |
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251 /* This function returns the opcode for a 'break 5' instruction. */ |
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252 |
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253 unsigned long __break_opcode () |
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254 { |
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255 return HAL_BREAKINST; |
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256 } |
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257 |
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258 #endif // CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS |
