7 #include <linux/ctype.h>
9 #include <bedbug/type.h>
10 #include <bedbug/bedbug.h>
11 #include <bedbug/regs.h>
12 #include <bedbug/ppc.h>
14 DECLARE_GLOBAL_DATA_PTR;
17 #define MAX(a,b) ((a) > (b) ? (a) : (b))
20 extern void show_regs __P ((struct pt_regs *));
21 extern int run_command __P ((const char *, int));
22 extern char console_buffer[];
24 ulong dis_last_addr = 0; /* Last address disassembled */
25 ulong dis_last_len = 20; /* Default disassembler length */
26 CPU_DEBUG_CTX bug_ctx; /* Bedbug context structure */
29 /* ======================================================================
30 * U-Boot's puts function does not append a newline, so the bedbug stuff
31 * will use this for the output of the dis/assembler.
32 * ====================================================================== */
34 int bedbug_puts (const char *str)
36 /* -------------------------------------------------- */
38 printf ("%s\r\n", str);
44 /* ======================================================================
45 * Initialize the bug_ctx structure used by the bedbug debugger. This is
46 * specific to the CPU since each has different debug registers and
48 * ====================================================================== */
50 void bedbug_init (void)
52 /* -------------------------------------------------- */
54 #if defined(CONFIG_4xx)
55 void bedbug405_init (void);
58 #elif defined(CONFIG_8xx)
59 void bedbug860_init (void);
64 #if defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260)
65 /* Processors that are 603e core based */
66 void bedbug603e_init (void);
76 /* ======================================================================
77 * Entry point from the interpreter to the disassembler. Repeated calls
78 * will resume from the last disassembled address.
79 * ====================================================================== */
80 int do_bedbug_dis (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
82 ulong addr; /* Address to start disassembly from */
83 ulong len; /* # of instructions to disassemble */
85 /* -------------------------------------------------- */
87 /* Setup to go from the last address if none is given */
92 printf ("Usage:\n%s\n", cmdtp->usage);
96 if ((flag & CMD_FLAG_REPEAT) == 0) {
98 addr = simple_strtoul (argv[1], NULL, 16);
100 /* If an extra param is given then it is the length */
102 len = simple_strtoul (argv[2], NULL, 16);
105 /* Run the disassembler */
106 disppc ((unsigned char *) addr, 0, len, bedbug_puts, F_RADHEX);
108 dis_last_addr = addr + (len * 4);
111 } /* do_bedbug_dis */
113 U_BOOT_CMD (ds, 3, 1, do_bedbug_dis,
114 "ds - disassemble memory\n",
115 "ds <address> [# instructions]\n");
117 /* ======================================================================
118 * Entry point from the interpreter to the assembler. Assembles
119 * instructions in consecutive memory locations until a '.' (period) is
120 * entered on a line by itself.
121 * ====================================================================== */
122 int do_bedbug_asm (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
124 long mem_addr; /* Address to assemble into */
125 unsigned long instr; /* Machine code for text */
126 char prompt[15]; /* Prompt string for user input */
127 int asm_err; /* Error code from the assembler */
129 /* -------------------------------------------------- */
133 printf ("Usage:\n%s\n", cmdtp->usage);
137 printf ("\nEnter '.' when done\n");
138 mem_addr = simple_strtoul (argv[1], NULL, 16);
142 disppc ((unsigned char *) mem_addr, 0, 1, bedbug_puts,
145 sprintf (prompt, "%08lx: ", mem_addr);
148 if (console_buffer[0] && strcmp (console_buffer, ".")) {
150 asmppc (mem_addr, console_buffer,
152 *(unsigned long *) mem_addr = instr;
155 printf ("*** Error: %s ***\n",
156 asm_error_str (asm_err));
164 } /* do_bedbug_asm */
166 U_BOOT_CMD (as, 2, 0, do_bedbug_asm,
167 "as - assemble memory\n", "as <address>\n");
169 /* ======================================================================
170 * Used to set a break point from the interpreter. Simply calls into the
171 * CPU-specific break point set routine.
172 * ====================================================================== */
174 int do_bedbug_break (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
176 /* -------------------------------------------------- */
177 if (bug_ctx.do_break)
178 (*bug_ctx.do_break) (cmdtp, flag, argc, argv);
181 } /* do_bedbug_break */
183 U_BOOT_CMD (break, 3, 0, do_bedbug_break,
184 "break - set or clear a breakpoint\n",
185 " - Set or clear a breakpoint\n"
186 "break <address> - Break at an address\n"
187 "break off <bp#> - Disable breakpoint.\n"
188 "break show - List breakpoints.\n");
190 /* ======================================================================
191 * Called from the debug interrupt routine. Simply calls the CPU-specific
192 * breakpoint handling routine.
193 * ====================================================================== */
195 void do_bedbug_breakpoint (struct pt_regs *regs)
197 /* -------------------------------------------------- */
199 if (bug_ctx.break_isr)
200 (*bug_ctx.break_isr) (regs);
203 } /* do_bedbug_breakpoint */
207 /* ======================================================================
208 * Called from the CPU-specific breakpoint handling routine. Enter a
209 * mini main loop until the stopped flag is cleared from the breakpoint
212 * This handles the parts of the debugger that are common to all CPU's.
213 * ====================================================================== */
215 void bedbug_main_loop (unsigned long addr, struct pt_regs *regs)
217 int len; /* Length of command line */
218 int flag; /* Command flags */
219 int rc = 0; /* Result from run_command */
220 char prompt_str[20]; /* Prompt string */
221 static char lastcommand[CFG_CBSIZE] = { 0 }; /* previous command */
222 /* -------------------------------------------------- */
225 (*bug_ctx.clear) (bug_ctx.current_bp);
227 printf ("Breakpoint %d: ", bug_ctx.current_bp);
228 disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);
233 sprintf (prompt_str, "BEDBUG.%d =>", bug_ctx.current_bp);
235 /* A miniature main loop */
236 while (bug_ctx.stopped) {
237 len = readline (prompt_str);
239 flag = 0; /* assume no special flags for now */
242 strcpy (lastcommand, console_buffer);
244 flag |= CMD_FLAG_REPEAT;
247 printf ("<INTERRUPT>\n");
249 rc = run_command (lastcommand, flag);
252 /* invalid command or not repeatable, forget it */
258 bug_ctx.current_bp = 0;
261 } /* bedbug_main_loop */
265 /* ======================================================================
266 * Interpreter command to continue from a breakpoint. Just clears the
267 * stopped flag in the context so that the breakpoint routine will
269 * ====================================================================== */
270 int do_bedbug_continue (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
272 /* -------------------------------------------------- */
274 if (!bug_ctx.stopped) {
275 printf ("Not at a breakpoint\n");
281 } /* do_bedbug_continue */
283 U_BOOT_CMD (continue, 1, 0, do_bedbug_continue,
284 "continue- continue from a breakpoint\n",
285 " - continue from a breakpoint.\n");
287 /* ======================================================================
288 * Interpreter command to continue to the next instruction, stepping into
289 * subroutines. Works by calling the find_next_addr() routine to compute
290 * the address passes control to the CPU-specific set breakpoint routine
291 * for the current breakpoint number.
292 * ====================================================================== */
293 int do_bedbug_step (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
295 unsigned long addr; /* Address to stop at */
297 /* -------------------------------------------------- */
299 if (!bug_ctx.stopped) {
300 printf ("Not at a breakpoint\n");
304 if (!find_next_address ((unsigned char *) &addr, FALSE, bug_ctx.regs))
308 (*bug_ctx.set) (bug_ctx.current_bp, addr);
312 } /* do_bedbug_step */
314 U_BOOT_CMD (step, 1, 1, do_bedbug_step,
315 "step - single step execution.\n",
316 " - single step execution.\n");
318 /* ======================================================================
319 * Interpreter command to continue to the next instruction, stepping over
320 * subroutines. Works by calling the find_next_addr() routine to compute
321 * the address passes control to the CPU-specific set breakpoint routine
322 * for the current breakpoint number.
323 * ====================================================================== */
324 int do_bedbug_next (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
326 unsigned long addr; /* Address to stop at */
328 /* -------------------------------------------------- */
330 if (!bug_ctx.stopped) {
331 printf ("Not at a breakpoint\n");
335 if (!find_next_address ((unsigned char *) &addr, TRUE, bug_ctx.regs))
339 (*bug_ctx.set) (bug_ctx.current_bp, addr);
343 } /* do_bedbug_next */
345 U_BOOT_CMD (next, 1, 1, do_bedbug_next,
346 "next - single step execution, stepping over subroutines.\n",
347 " - single step execution, stepping over subroutines.\n");
349 /* ======================================================================
350 * Interpreter command to print the current stack. This assumes an EABI
351 * architecture, so it starts with GPR R1 and works back up the stack.
352 * ====================================================================== */
353 int do_bedbug_stack (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
355 unsigned long sp; /* Stack pointer */
356 unsigned long func; /* LR from stack */
357 int depth; /* Stack iteration level */
358 int skip = 1; /* Flag to skip the first entry */
359 unsigned long top; /* Top of memory address */
361 /* -------------------------------------------------- */
363 if (!bug_ctx.stopped) {
364 printf ("Not at a breakpoint\n");
368 top = gd->bd->bi_memstart + gd->bd->bi_memsize;
371 printf ("Depth PC\n");
372 printf ("----- --------\n");
373 printf ("%5d %08lx\n", depth++, bug_ctx.regs->nip);
375 sp = bug_ctx.regs->gpr[1];
376 func = *(unsigned long *) (sp + 4);
378 while ((func < top) && (sp < top)) {
380 printf ("%5d %08lx\n", depth++, func);
384 sp = *(unsigned long *) sp;
385 func = *(unsigned long *) (sp + 4);
388 } /* do_bedbug_stack */
390 U_BOOT_CMD (where, 1, 1, do_bedbug_stack,
391 "where - Print the running stack.\n",
392 " - Print the running stack.\n");
394 /* ======================================================================
395 * Interpreter command to dump the registers. Calls the CPU-specific
396 * show registers routine.
397 * ====================================================================== */
398 int do_bedbug_rdump (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
400 /* -------------------------------------------------- */
402 if (!bug_ctx.stopped) {
403 printf ("Not at a breakpoint\n");
407 show_regs (bug_ctx.regs);
409 } /* do_bedbug_rdump */
411 U_BOOT_CMD (rdump, 1, 1, do_bedbug_rdump,
412 "rdump - Show registers.\n", " - Show registers.\n");
413 /* ====================================================================== */
417 * Copyright (c) 2001 William L. Pitts
418 * All rights reserved.
420 * Redistribution and use in source and binary forms are freely
421 * permitted provided that the above copyright notice and this
422 * paragraph and the following disclaimer are duplicated in all
425 * This software is provided "AS IS" and without any express or
426 * implied warranties, including, without limitation, the implied
427 * warranties of merchantability and fitness for a particular