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annotate gdb_remote.c @ 495:39cad98d2789

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Allow OpenGL support to be disabled at compile time. Move generic utility functions out of config.c
author Mike Pavone <pavone@retrodev.com>
date Mon, 28 Oct 2013 19:37:30 -0700
parents 140af5509ce7
children b7b7a1cab44a
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140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
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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 "blastem.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
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13 #define INITIAL_BUFFER_SIZE 4096
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14
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15 char * buf = NULL;
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16 char * curbuf = NULL;
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17 size_t bufsize;
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18 int cont = 0;
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19 int expect_break_response=0;
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20 uint32_t resume_pc;
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21
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22 void gdb_debug_enter(genesis_context * gen, uint32_t pc)
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23 {
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24 resume_pc = pc;
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25 while(!cont)
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26 {
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27 }
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28 cont = 0;
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29 }
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30
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31 void gdb_run_command(genesis_context * gen, char * command)
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32 {
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33 switch(*command)
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34 {
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35 case 'c':
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36 if (*(command+1) != 0) {
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37 resume_pc =
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38 }
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39 cont = 1;
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40 expect_break_response = 1;
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41 break;
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42 case 's':
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43
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44 }
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45 }
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46
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47 void gdb_run_commands(genesis_context * gen)
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48 {
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49 int enter_debugger = 0;
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50 char * cur = buf;
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51 while(cur < curbuf);
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52 {
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53 if(*cur == '$') {
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54 cur++
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55 char * start = cur;
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56 while (cur < curbuf && *cur != '#') {
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57 cur++;
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58 }
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59 if (*cur == '#') {
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60 //check to make sure we've received the checksum bytes
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61 if (curbuf-cur >= 2) {
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62 //TODO: verify checksum
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63 //Null terminate payload
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64 //send acknowledgement
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65 write(FILENO_STDOUT, "+", 1);
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66 gdb_run_command(genesis_context * gen, start);
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67 cur += 2;
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68 } else {
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69 cur = start - 1;
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70 break;
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71 }
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72 } else {
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73 cur = start - 1;
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74 break;
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75 }
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76 } else {
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77 if (*cur == 0x03) {
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78 enter_debugger = 1;
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79 }
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80 cur++;
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81 }
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82 }
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83
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84 //FIXME
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85 if (consumed == curbuf-buf) {
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86 curbuf = buf;
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87 } else if (consumed > 0) {
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88 memmove(buf, buf + consumed, curbuf - buf - consumed);
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89 curbuf -= consumed;
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90 }
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91 }
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92
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93 void gdb_command_poll(genesis_context * gen)
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94 {
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95 for(;;)
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96 {
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97 if (curbuf == buf + bufsize) {
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98 //buffer is full, expand it
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99 bufsize *= 2;
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100 buf = realloc(buf, bufsize);
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101 if (!buf) {
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102 fprintf(stderr, "Failed to grow GDB command buffer to %d bytes\n", (int)bufsize);
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103 exit(1);
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104 }
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105 curbuf = buf + bufsize/2;
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106 }
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107 int numread = read(STDIN_FILENO, buf, bufsize - (curbuf-buf));
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108 if (numread < 0) {
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109 if (errno == EAGAIN || errno == EWOULDBLOCK) {
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110 return;
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111 } else {
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112 fprintf(stderr, "Error %d while reading GDB commands from stdin", errno);
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113 exit(1);
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114 }
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115 } else if (numread == 0) {
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116 exit(0);
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117 }
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118 gdb_run_commands(genesis_context * gen);
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119 }
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120 }
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121
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122 void gdb_remote_init()
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123 {
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124 fcntl(STDIN_FILENO, FD_SETFL, O_NONBLOCK);
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125 buf = malloc(INITIAL_BUFFER_SIZE);
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126 curbuf = buf;
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127 bufzie = INITIAL_BUFFER_SIZE;
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128 }