Mercurial > repos > blastem
annotate gdb_remote.c @ 524:fb39534b6604
Move debugging code outside of main source file
author | Mike Pavone <pavone@retrodev.com> |
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date | Tue, 11 Feb 2014 21:53:31 -0800 |
parents | 1495179d6737 |
children | 62860044337d |
rev | line source |
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1 /* |
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2 Copyright 2013 Michael Pavone |
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3 This file is part of BlastEm. |
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. |
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5 */ |
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6 #include "gdb_remote.h" |
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7 #include <unistd.h> |
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8 #include <fcntl.h> |
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9 #include <stddef.h> |
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10 #include <stdlib.h> |
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11 #include <stdio.h> |
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12 #include <string.h> |
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13 |
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14 #define INITIAL_BUFFER_SIZE (16*1024) |
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15 |
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16 char * buf = NULL; |
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17 char * curbuf = NULL; |
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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
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18 char * end = NULL; |
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19 size_t bufsize; |
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20 int cont = 0; |
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21 int expect_break_response=0; |
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22 uint32_t resume_pc; |
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23 |
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24 |
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25 void hex_32(uint32_t num, char * out) |
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26 { |
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27 for (int32_t shift = 28; shift >= 0; shift -= 4) |
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28 { |
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29 uint8_t nibble = num >> shift & 0xF; |
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30 *(out++) = nibble > 9 ? nibble - 0xA + 'A' : nibble + '0'; |
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31 } |
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32 } |
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33 |
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34 void hex_16(uint16_t num, char * out) |
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35 { |
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36 for (int16_t shift = 14; shift >= 0; shift -= 4) |
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37 { |
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38 uint8_t nibble = num >> shift & 0xF; |
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39 *(out++) = nibble > 9 ? nibble - 0xA + 'A' : nibble + '0'; |
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40 } |
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41 } |
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42 |
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43 void hex_8(uint8_t num, char * out) |
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44 { |
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45 uint8_t nibble = num >> 4; |
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46 *(out++) = nibble > 9 ? nibble - 0xA + 'A' : nibble + '0'; |
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47 nibble = num & 0xF; |
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48 *out = nibble > 9 ? nibble - 0xA + 'A' : nibble + '0'; |
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49 } |
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50 |
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51 void gdb_calc_checksum(char * command, char *out) |
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52 { |
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53 uint8_t checksum = 0; |
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54 while (*command) |
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55 { |
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56 checksum += *(command++); |
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57 } |
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58 hex_8(checksum, out); |
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59 } |
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60 |
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61 void write_or_die(int fd, const void *buf, size_t count) |
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62 { |
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63 if (write(fd, buf, count) < count) { |
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64 fputs("Error writing to stdout\n", stderr); |
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65 exit(1); |
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66 } |
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67 } |
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68 |
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69 void gdb_send_command(char * command) |
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70 { |
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71 char end[3]; |
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72 write_or_die(STDOUT_FILENO, "$", 1); |
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73 write_or_die(STDOUT_FILENO, command, strlen(command)); |
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74 end[0] = '#'; |
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75 gdb_calc_checksum(command, end+1); |
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76 write_or_die(STDOUT_FILENO, end, 3); |
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77 fprintf(stderr, "Sent $%s#%c%c\n", command, end[1], end[2]); |
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78 } |
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79 |
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80 uint32_t calc_status(m68k_context * context) |
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81 { |
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82 uint32_t status = context->status << 3; |
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83 for (int i = 0; i < 5; i++) |
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84 { |
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85 status <<= 1; |
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86 status |= context->flags[i]; |
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87 } |
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88 return status; |
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89 } |
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90 |
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91 uint8_t read_byte(m68k_context * context, uint32_t address) |
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92 { |
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93 uint16_t * word; |
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94 //TODO: Use generated read/write functions so that memory map is properly respected |
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95 if (address < 0x400000) { |
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96 word = context->mem_pointers[0] + address/2; |
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97 } else if (address >= 0xE00000) { |
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98 word = context->mem_pointers[1] + (address & 0xFFFF)/2; |
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99 } else { |
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100 return 0; |
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101 } |
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102 if (address & 1) { |
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103 return *word; |
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104 } |
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105 return *word >> 8; |
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106 } |
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107 |
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108 void gdb_run_command(m68k_context * context, uint32_t pc, char * command) |
456
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109 { |
515
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110 char send_buf[512]; |
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111 fprintf(stderr, "Received command %s\n", command); |
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112 switch(*command) |
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113 { |
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114 |
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115 case 'c': |
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116 if (*(command+1) != 0) { |
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117 //TODO: implement resuming at an arbitrary address |
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118 goto not_impl; |
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119 } |
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120 cont = 1; |
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121 expect_break_response = 1; |
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122 break; |
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123 case 'H': |
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124 if (command[1] == 'g' || command[1] == 'c') {; |
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125 //no thread suport, just acknowledge |
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126 gdb_send_command("OK"); |
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127 } else { |
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128 goto not_impl; |
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129 } |
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130 break; |
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131 case 'Z': { |
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132 uint8_t type = command[1]; |
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133 if (type < '2') { |
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134 uint32_t address = strtoul(command+3, NULL, 16); |
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135 insert_breakpoint(context, address, (uint8_t *)gdb_debug_enter); |
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136 gdb_send_command("OK"); |
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137 } else { |
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138 //watchpoints are not currently supported |
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139 gdb_send_command(""); |
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140 } |
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141 break; |
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142 } |
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143 case 'z': { |
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144 uint8_t type = command[1]; |
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145 if (type < '2') { |
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146 uint32_t address = strtoul(command+3, NULL, 16); |
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147 remove_breakpoint(context, address); |
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148 gdb_send_command("OK"); |
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149 } else { |
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150 //watchpoints are not currently supported |
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151 gdb_send_command(""); |
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152 } |
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153 break; |
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154 } |
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155 case 'g': { |
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156 char * cur = send_buf; |
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157 for (int i = 0; i < 8; i++) |
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158 { |
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159 hex_32(context->dregs[i], cur); |
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160 cur += 8; |
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161 } |
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162 for (int i = 0; i < 8; i++) |
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163 { |
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164 hex_32(context->aregs[i], cur); |
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165 cur += 8; |
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166 } |
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167 hex_32(calc_status(context), cur); |
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168 cur += 8; |
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169 hex_32(pc, cur); |
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170 cur += 8; |
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171 *cur = 0; |
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172 gdb_send_command(send_buf); |
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173 break; |
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174 } |
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175 case 'm': { |
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176 char * rest; |
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177 uint32_t address = strtoul(command+1, &rest, 16); |
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178 uint32_t size = strtoul(rest+1, NULL, 16); |
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179 if (size > sizeof(send_buf-1)/2) { |
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180 size = sizeof(send_buf-1)/2; |
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181 } |
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182 char *cur = send_buf; |
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183 while (size) |
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184 { |
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185 hex_8(read_byte(context, address), cur); |
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186 cur += 2; |
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187 address++; |
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188 size--; |
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189 } |
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190 *cur = 0; |
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191 gdb_send_command(send_buf); |
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192 break; |
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193 } |
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194 case 'p': { |
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195 unsigned long reg = strtoul(command+1, NULL, 16); |
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196 |
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197 if (reg < 8) { |
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198 hex_32(context->dregs[reg], send_buf); |
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199 } else if (reg < 16) { |
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200 hex_32(context->aregs[reg-8], send_buf); |
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201 } else if (reg == 16) { |
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202 hex_32(calc_status(context), send_buf); |
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203 } else if (reg == 17) { |
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204 hex_32(pc, send_buf); |
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205 } else { |
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206 send_buf[0] = 0; |
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207 } |
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208 send_buf[8] = 0; |
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209 gdb_send_command(send_buf); |
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210 break; |
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211 } |
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212 case 'q': |
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213 if (!memcmp("Supported", command+1, strlen("Supported"))) { |
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214 sprintf(send_buf, "PacketSize=%X", (int)bufsize); |
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215 gdb_send_command(send_buf); |
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216 } else if (!memcmp("Attached", command+1, strlen("Supported"))) { |
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217 //not really meaningful for us, but saying we spawned a new process |
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218 //is probably closest to the truth |
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219 gdb_send_command("0"); |
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220 } else if (!memcmp("Offsets", command+1, strlen("Offsets"))) { |
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221 //no relocations, so offsets are all 0 |
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222 gdb_send_command("Text=0;Data=0;Bss=0"); |
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223 } else if (!memcmp("Symbol", command+1, strlen("Symbol"))) { |
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224 gdb_send_command(""); |
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225 } else if (!memcmp("TStatus", command+1, strlen("TStatus"))) { |
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226 //TODO: actual tracepoint support |
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227 gdb_send_command("T0;tnotrun:0"); |
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228 } else if (!memcmp("TfV", command+1, strlen("TfV")) || !memcmp("TfP", command+1, strlen("TfP"))) { |
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229 //TODO: actual tracepoint support |
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230 gdb_send_command(""); |
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231 } else if (command[1] == 'C') { |
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232 //we only support a single thread currently, so send 1 |
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233 gdb_send_command("1"); |
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234 } else { |
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235 goto not_impl; |
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236 } |
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237 break; |
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238 case 'v': |
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239 if (!memcmp("Cont?", command+1, strlen("Cont?"))) { |
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240 gdb_send_command("vCont;c;C;s;S"); |
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241 } else if (!memcmp("Cont;", command+1, strlen("Cont;"))) { |
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242 switch (*(command + 1 + strlen("Cont;"))) |
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243 { |
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244 case 'c': |
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245 case 'C': |
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246 //might be interesting to have continue with signal fire a |
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247 //trap exception or something, but for no we'll treat it as |
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248 //a normal continue |
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249 cont = 1; |
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250 expect_break_response = 1; |
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251 break; |
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252 default: |
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253 goto not_impl; |
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254 } |
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255 } else { |
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256 goto not_impl; |
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257 } |
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258 break; |
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259 case '?': |
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260 gdb_send_command("S05"); |
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261 break; |
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262 default: |
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263 goto not_impl; |
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264 |
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265 } |
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266 return; |
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267 not_impl: |
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268 fprintf(stderr, "Command %s is not implemented, exiting...\n", command); |
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269 exit(1); |
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270 } |
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271 |
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272 m68k_context * gdb_debug_enter(m68k_context * context, uint32_t pc) |
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273 { |
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274 fprintf(stderr, "Entered debugger at address %X\n", pc); |
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275 if (expect_break_response) { |
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276 gdb_send_command("S05"); |
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277 expect_break_response = 0; |
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278 } |
456
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279 resume_pc = pc; |
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280 cont = 0; |
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281 uint8_t partial = 0; |
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282 while(!cont) |
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283 { |
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284 if (!curbuf) { |
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285 int numread = read(STDIN_FILENO, buf, bufsize); |
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286 curbuf = buf; |
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287 end = buf + numread; |
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288 } else if (partial) { |
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289 if (curbuf != buf) { |
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290 memmove(curbuf, buf, end-curbuf); |
515
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291 end -= curbuf - buf; |
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292 } |
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293 int numread = read(STDIN_FILENO, end, bufsize - (end-buf)); |
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294 end += numread; |
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295 curbuf = buf; |
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296 } |
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297 for (; curbuf < end; curbuf++) |
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298 { |
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299 if (*curbuf == '$') |
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300 { |
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301 curbuf++; |
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302 char * start = curbuf; |
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303 while (curbuf < end && *curbuf != '#') { |
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304 curbuf++; |
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305 } |
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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
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306 if (*curbuf == '#') { |
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307 //check to make sure we've received the checksum bytes |
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308 if (end-curbuf >= 2) { |
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309 //TODO: verify checksum |
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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
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310 //Null terminate payload |
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311 *curbuf = 0; |
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312 //send acknowledgement |
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313 if (write(STDOUT_FILENO, "+", 1) < 1) { |
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314 fputs("Error writing to stdout\n", stderr); |
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315 exit(1); |
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316 } |
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317 gdb_run_command(context, pc, start); |
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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
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318 curbuf += 2; |
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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
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319 } |
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320 } else { |
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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
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321 curbuf--; |
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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
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322 partial = 1; |
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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
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323 break; |
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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
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324 } |
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325 } else { |
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326 fprintf(stderr, "Ignoring character %c\n", *curbuf); |
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327 } |
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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
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328 } |
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329 if (curbuf == end) { |
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330 curbuf = NULL; |
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331 } |
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332 } |
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333 return context; |
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334 } |
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335 |
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336 void gdb_remote_init(void) |
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337 { |
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338 buf = malloc(INITIAL_BUFFER_SIZE); |
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339 curbuf = NULL; |
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340 bufsize = INITIAL_BUFFER_SIZE; |
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341 } |