common/cmd_bedbug.c

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