1 | /* |
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2 | * BedBug Functions |
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3 | */ |
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4 | |
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5 | #include <common.h> |
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6 | #include <command.h> |
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7 | #include <linux/ctype.h> |
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8 | #include <net.h> |
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9 | #include <bedbug/type.h> |
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10 | #include <bedbug/bedbug.h> |
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11 | #include <bedbug/regs.h> |
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12 | #include <bedbug/ppc.h> |
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13 | |
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14 | DECLARE_GLOBAL_DATA_PTR; |
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15 | |
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16 | #ifndef MAX |
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17 | #define MAX(a,b) ((a) > (b) ? (a) : (b)) |
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18 | #endif |
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19 | |
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20 | extern void show_regs __P ((struct pt_regs *)); |
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21 | extern int run_command __P ((const char *, int)); |
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22 | extern char console_buffer[]; |
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23 | |
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24 | ulong dis_last_addr = 0; /* Last address disassembled */ |
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25 | ulong dis_last_len = 20; /* Default disassembler length */ |
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26 | CPU_DEBUG_CTX bug_ctx; /* Bedbug context structure */ |
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27 | |
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28 | |
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29 | /* ====================================================================== |
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30 | * U-Boot's puts function does not append a newline, so the bedbug stuff |
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31 | * will use this for the output of the dis/assembler. |
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32 | * ====================================================================== */ |
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33 | |
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34 | int bedbug_puts (const char *str) |
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35 | { |
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36 | /* -------------------------------------------------- */ |
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37 | |
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38 | printf ("%s\r\n", str); |
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39 | return 0; |
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40 | } /* bedbug_puts */ |
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41 | |
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42 | |
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43 | |
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44 | /* ====================================================================== |
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45 | * Initialize the bug_ctx structure used by the bedbug debugger. This is |
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46 | * specific to the CPU since each has different debug registers and |
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47 | * settings. |
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48 | * ====================================================================== */ |
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49 | |
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50 | void bedbug_init (void) |
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51 | { |
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52 | /* -------------------------------------------------- */ |
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53 | |
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54 | #if defined(CONFIG_4xx) |
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55 | void bedbug405_init (void); |
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56 | |
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57 | bedbug405_init (); |
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58 | #elif defined(CONFIG_8xx) |
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59 | void bedbug860_init (void); |
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60 | |
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61 | bedbug860_init (); |
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62 | #endif |
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63 | |
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64 | #if defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260) |
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65 | /* Processors that are 603e core based */ |
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66 | void bedbug603e_init (void); |
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67 | |
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68 | bedbug603e_init (); |
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69 | #endif |
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70 | |
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71 | return; |
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72 | } /* bedbug_init */ |
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73 | |
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74 | |
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75 | |
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76 | /* ====================================================================== |
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77 | * Entry point from the interpreter to the disassembler. Repeated calls |
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78 | * will resume from the last disassembled address. |
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79 | * ====================================================================== */ |
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80 | int do_bedbug_dis (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) |
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81 | { |
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82 | ulong addr; /* Address to start disassembly from */ |
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83 | ulong len; /* # of instructions to disassemble */ |
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84 | |
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85 | /* -------------------------------------------------- */ |
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86 | |
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87 | /* Setup to go from the last address if none is given */ |
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88 | addr = dis_last_addr; |
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89 | len = dis_last_len; |
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90 | |
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91 | if (argc < 2) { |
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92 | printf ("Usage:\n%s\n", cmdtp->usage); |
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93 | return 1; |
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94 | } |
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95 | |
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96 | if ((flag & CMD_FLAG_REPEAT) == 0) { |
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97 | /* New command */ |
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98 | addr = simple_strtoul (argv[1], NULL, 16); |
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99 | |
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100 | /* If an extra param is given then it is the length */ |
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101 | if (argc > 2) |
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102 | len = simple_strtoul (argv[2], NULL, 16); |
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103 | } |
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104 | |
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105 | /* Run the disassembler */ |
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106 | disppc ((unsigned char *) addr, 0, len, bedbug_puts, F_RADHEX); |
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107 | |
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108 | dis_last_addr = addr + (len * 4); |
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109 | dis_last_len = len; |
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110 | return 0; |
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111 | } /* do_bedbug_dis */ |
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112 | |
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113 | U_BOOT_CMD (ds, 3, 1, do_bedbug_dis, |
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114 | "ds - disassemble memory\n", |
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115 | "ds <address> [# instructions]\n"); |
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116 | |
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117 | /* ====================================================================== |
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118 | * Entry point from the interpreter to the assembler. Assembles |
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119 | * instructions in consecutive memory locations until a '.' (period) is |
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120 | * entered on a line by itself. |
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121 | * ====================================================================== */ |
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122 | int do_bedbug_asm (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) |
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123 | { |
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124 | long mem_addr; /* Address to assemble into */ |
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125 | unsigned long instr; /* Machine code for text */ |
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126 | char prompt[15]; /* Prompt string for user input */ |
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127 | int asm_err; /* Error code from the assembler */ |
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128 | |
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129 | /* -------------------------------------------------- */ |
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130 | int rcode = 0; |
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131 | |
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132 | if (argc < 2) { |
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133 | printf ("Usage:\n%s\n", cmdtp->usage); |
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134 | return 1; |
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135 | } |
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136 | |
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137 | printf ("\nEnter '.' when done\n"); |
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138 | mem_addr = simple_strtoul (argv[1], NULL, 16); |
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139 | |
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140 | while (1) { |
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141 | putc ('\n'); |
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142 | disppc ((unsigned char *) mem_addr, 0, 1, bedbug_puts, |
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143 | F_RADHEX); |
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144 | |
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145 | sprintf (prompt, "%08lx: ", mem_addr); |
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146 | readline (prompt); |
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147 | |
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148 | if (console_buffer[0] && strcmp (console_buffer, ".")) { |
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149 | if ((instr = |
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150 | asmppc (mem_addr, console_buffer, |
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151 | &asm_err)) != 0) { |
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152 | *(unsigned long *) mem_addr = instr; |
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153 | mem_addr += 4; |
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154 | } else { |
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155 | printf ("*** Error: %s ***\n", |
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156 | asm_error_str (asm_err)); |
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157 | rcode = 1; |
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158 | } |
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159 | } else { |
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160 | break; |
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161 | } |
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162 | } |
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163 | return rcode; |
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164 | } /* do_bedbug_asm */ |
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165 | |
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166 | U_BOOT_CMD (as, 2, 0, do_bedbug_asm, |
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167 | "as - assemble memory\n", "as <address>\n"); |
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168 | |
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169 | /* ====================================================================== |
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170 | * Used to set a break point from the interpreter. Simply calls into the |
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171 | * CPU-specific break point set routine. |
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172 | * ====================================================================== */ |
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173 | |
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174 | int do_bedbug_break (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) |
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175 | { |
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176 | /* -------------------------------------------------- */ |
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177 | if (bug_ctx.do_break) |
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178 | (*bug_ctx.do_break) (cmdtp, flag, argc, argv); |
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179 | return 0; |
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180 | |
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181 | } /* do_bedbug_break */ |
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182 | |
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183 | U_BOOT_CMD (break, 3, 0, do_bedbug_break, |
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184 | "break - set or clear a breakpoint\n", |
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185 | " - Set or clear a breakpoint\n" |
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186 | "break <address> - Break at an address\n" |
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187 | "break off <bp#> - Disable breakpoint.\n" |
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188 | "break show - List breakpoints.\n"); |
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189 | |
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190 | /* ====================================================================== |
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191 | * Called from the debug interrupt routine. Simply calls the CPU-specific |
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192 | * breakpoint handling routine. |
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193 | * ====================================================================== */ |
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194 | |
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195 | void do_bedbug_breakpoint (struct pt_regs *regs) |
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196 | { |
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197 | /* -------------------------------------------------- */ |
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198 | |
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199 | if (bug_ctx.break_isr) |
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200 | (*bug_ctx.break_isr) (regs); |
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201 | |
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202 | return; |
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203 | } /* do_bedbug_breakpoint */ |
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204 | |
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205 | |
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206 | |
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207 | /* ====================================================================== |
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208 | * Called from the CPU-specific breakpoint handling routine. Enter a |
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209 | * mini main loop until the stopped flag is cleared from the breakpoint |
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210 | * context. |
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211 | * |
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212 | * This handles the parts of the debugger that are common to all CPU's. |
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213 | * ====================================================================== */ |
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214 | |
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215 | void bedbug_main_loop (unsigned long addr, struct pt_regs *regs) |
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216 | { |
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217 | int len; /* Length of command line */ |
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218 | int flag; /* Command flags */ |
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219 | int rc = 0; /* Result from run_command */ |
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220 | char prompt_str[20]; /* Prompt string */ |
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221 | static char lastcommand[CFG_CBSIZE] = { 0 }; /* previous command */ |
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222 | /* -------------------------------------------------- */ |
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223 | |
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224 | if (bug_ctx.clear) |
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225 | (*bug_ctx.clear) (bug_ctx.current_bp); |
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226 | |
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227 | printf ("Breakpoint %d: ", bug_ctx.current_bp); |
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228 | disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX); |
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229 | |
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230 | bug_ctx.stopped = 1; |
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231 | bug_ctx.regs = regs; |
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232 | |
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233 | sprintf (prompt_str, "BEDBUG.%d =>", bug_ctx.current_bp); |
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234 | |
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235 | /* A miniature main loop */ |
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236 | while (bug_ctx.stopped) { |
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237 | len = readline (prompt_str); |
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238 | |
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239 | flag = 0; /* assume no special flags for now */ |
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240 | |
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241 | if (len > 0) |
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242 | strcpy (lastcommand, console_buffer); |
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243 | else if (len == 0) |
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244 | flag |= CMD_FLAG_REPEAT; |
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245 | |
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246 | if (len == -1) |
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247 | printf ("<INTERRUPT>\n"); |
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248 | else |
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249 | rc = run_command (lastcommand, flag); |
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250 | |
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251 | if (rc <= 0) { |
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252 | /* invalid command or not repeatable, forget it */ |
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253 | lastcommand[0] = 0; |
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254 | } |
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255 | } |
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256 | |
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257 | bug_ctx.regs = NULL; |
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258 | bug_ctx.current_bp = 0; |
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259 | |
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260 | return; |
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261 | } /* bedbug_main_loop */ |
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262 | |
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263 | |
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264 | |
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265 | /* ====================================================================== |
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266 | * Interpreter command to continue from a breakpoint. Just clears the |
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267 | * stopped flag in the context so that the breakpoint routine will |
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268 | * return. |
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269 | * ====================================================================== */ |
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270 | int do_bedbug_continue (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) |
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271 | { |
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272 | /* -------------------------------------------------- */ |
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273 | |
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274 | if (!bug_ctx.stopped) { |
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275 | printf ("Not at a breakpoint\n"); |
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276 | return 1; |
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277 | } |
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278 | |
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279 | bug_ctx.stopped = 0; |
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280 | return 0; |
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281 | } /* do_bedbug_continue */ |
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282 | |
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283 | U_BOOT_CMD (continue, 1, 0, do_bedbug_continue, |
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284 | "continue- continue from a breakpoint\n", |
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285 | " - continue from a breakpoint.\n"); |
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286 | |
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287 | /* ====================================================================== |
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288 | * Interpreter command to continue to the next instruction, stepping into |
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289 | * subroutines. Works by calling the find_next_addr() routine to compute |
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290 | * the address passes control to the CPU-specific set breakpoint routine |
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291 | * for the current breakpoint number. |
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292 | * ====================================================================== */ |
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293 | int do_bedbug_step (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) |
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294 | { |
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295 | unsigned long addr; /* Address to stop at */ |
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296 | |
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297 | /* -------------------------------------------------- */ |
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298 | |
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299 | if (!bug_ctx.stopped) { |
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300 | printf ("Not at a breakpoint\n"); |
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301 | return 1; |
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302 | } |
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303 | |
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304 | if (!find_next_address ((unsigned char *) &addr, FALSE, bug_ctx.regs)) |
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305 | return 1; |
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306 | |
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307 | if (bug_ctx.set) |
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308 | (*bug_ctx.set) (bug_ctx.current_bp, addr); |
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309 | |
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310 | bug_ctx.stopped = 0; |
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311 | return 0; |
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312 | } /* do_bedbug_step */ |
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313 | |
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314 | U_BOOT_CMD (step, 1, 1, do_bedbug_step, |
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315 | "step - single step execution.\n", |
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316 | " - single step execution.\n"); |
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317 | |
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318 | /* ====================================================================== |
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319 | * Interpreter command to continue to the next instruction, stepping over |
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320 | * subroutines. Works by calling the find_next_addr() routine to compute |
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321 | * the address passes control to the CPU-specific set breakpoint routine |
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322 | * for the current breakpoint number. |
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323 | * ====================================================================== */ |
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324 | int do_bedbug_next (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) |
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325 | { |
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326 | unsigned long addr; /* Address to stop at */ |
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327 | |
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328 | /* -------------------------------------------------- */ |
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329 | |
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330 | if (!bug_ctx.stopped) { |
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331 | printf ("Not at a breakpoint\n"); |
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332 | return 1; |
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333 | } |
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334 | |
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335 | if (!find_next_address ((unsigned char *) &addr, TRUE, bug_ctx.regs)) |
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336 | return 1; |
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337 | |
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338 | if (bug_ctx.set) |
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339 | (*bug_ctx.set) (bug_ctx.current_bp, addr); |
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340 | |
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341 | bug_ctx.stopped = 0; |
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342 | return 0; |
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343 | } /* do_bedbug_next */ |
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344 | |
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345 | U_BOOT_CMD (next, 1, 1, do_bedbug_next, |
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346 | "next - single step execution, stepping over subroutines.\n", |
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347 | " - single step execution, stepping over subroutines.\n"); |
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348 | |
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349 | /* ====================================================================== |
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350 | * Interpreter command to print the current stack. This assumes an EABI |
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351 | * architecture, so it starts with GPR R1 and works back up the stack. |
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352 | * ====================================================================== */ |
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353 | int do_bedbug_stack (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) |
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354 | { |
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355 | unsigned long sp; /* Stack pointer */ |
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356 | unsigned long func; /* LR from stack */ |
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357 | int depth; /* Stack iteration level */ |
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358 | int skip = 1; /* Flag to skip the first entry */ |
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359 | unsigned long top; /* Top of memory address */ |
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360 | |
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361 | /* -------------------------------------------------- */ |
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362 | |
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363 | if (!bug_ctx.stopped) { |
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364 | printf ("Not at a breakpoint\n"); |
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365 | return 1; |
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366 | } |
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367 | |
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368 | top = gd->bd->bi_memstart + gd->bd->bi_memsize; |
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369 | depth = 0; |
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370 | |
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371 | printf ("Depth PC\n"); |
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372 | printf ("----- --------\n"); |
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373 | printf ("%5d %08lx\n", depth++, bug_ctx.regs->nip); |
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374 | |
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375 | sp = bug_ctx.regs->gpr[1]; |
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376 | func = *(unsigned long *) (sp + 4); |
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377 | |
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378 | while ((func < top) && (sp < top)) { |
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379 | if (!skip) |
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380 | printf ("%5d %08lx\n", depth++, func); |
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381 | else |
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382 | --skip; |
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383 | |
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384 | sp = *(unsigned long *) sp; |
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385 | func = *(unsigned long *) (sp + 4); |
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386 | } |
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387 | return 0; |
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388 | } /* do_bedbug_stack */ |
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389 | |
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390 | U_BOOT_CMD (where, 1, 1, do_bedbug_stack, |
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391 | "where - Print the running stack.\n", |
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392 | " - Print the running stack.\n"); |
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393 | |
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394 | /* ====================================================================== |
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395 | * Interpreter command to dump the registers. Calls the CPU-specific |
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396 | * show registers routine. |
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397 | * ====================================================================== */ |
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398 | int do_bedbug_rdump (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) |
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399 | { |
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400 | /* -------------------------------------------------- */ |
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401 | |
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402 | if (!bug_ctx.stopped) { |
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403 | printf ("Not at a breakpoint\n"); |
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404 | return 1; |
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405 | } |
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406 | |
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407 | show_regs (bug_ctx.regs); |
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408 | return 0; |
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409 | } /* do_bedbug_rdump */ |
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410 | |
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411 | U_BOOT_CMD (rdump, 1, 1, do_bedbug_rdump, |
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412 | "rdump - Show registers.\n", " - Show registers.\n"); |
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413 | /* ====================================================================== */ |
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414 | |
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415 | |
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416 | /* |
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417 | * Copyright (c) 2001 William L. Pitts |
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418 | * All rights reserved. |
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419 | * |
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420 | * Redistribution and use in source and binary forms are freely |
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421 | * permitted provided that the above copyright notice and this |
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422 | * paragraph and the following disclaimer are duplicated in all |
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423 | * such forms. |
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424 | * |
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425 | * This software is provided "AS IS" and without any express or |
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426 | * implied warranties, including, without limitation, the implied |
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427 | * warranties of merchantability and fitness for a particular |
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428 | * purpose. |
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429 | */ |
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