9 #include <linux/ctype.h>
11 #include <bedbug/type.h>
12 #include <bedbug/bedbug.h>
13 #include <bedbug/regs.h>
14 #include <bedbug/ppc.h>
16 DECLARE_GLOBAL_DATA_PTR;
18 extern void show_regs __P ((struct pt_regs *));
19 extern int run_command __P ((const char *, int));
21 ulong dis_last_addr = 0; /* Last address disassembled */
22 ulong dis_last_len = 20; /* Default disassembler length */
23 CPU_DEBUG_CTX bug_ctx; /* Bedbug context structure */
26 /* ======================================================================
27 * U-Boot's puts function does not append a newline, so the bedbug stuff
28 * will use this for the output of the dis/assembler.
29 * ====================================================================== */
31 int bedbug_puts (const char *str)
33 /* -------------------------------------------------- */
35 printf ("%s\r\n", str);
41 /* ======================================================================
42 * Initialize the bug_ctx structure used by the bedbug debugger. This is
43 * specific to the CPU since each has different debug registers and
45 * ====================================================================== */
47 void bedbug_init (void)
49 /* -------------------------------------------------- */
51 #if defined(CONFIG_4xx)
52 void bedbug405_init (void);
55 #elif defined(CONFIG_8xx)
56 void bedbug860_init (void);
61 #if defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260)
62 /* Processors that are 603e core based */
63 void bedbug603e_init (void);
73 /* ======================================================================
74 * Entry point from the interpreter to the disassembler. Repeated calls
75 * will resume from the last disassembled address.
76 * ====================================================================== */
77 int do_bedbug_dis (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
79 ulong addr; /* Address to start disassembly from */
80 ulong len; /* # of instructions to disassemble */
82 /* -------------------------------------------------- */
84 /* Setup to go from the last address if none is given */
91 if ((flag & CMD_FLAG_REPEAT) == 0) {
93 addr = simple_strtoul (argv[1], NULL, 16);
95 /* If an extra param is given then it is the length */
97 len = simple_strtoul (argv[2], NULL, 16);
100 /* Run the disassembler */
101 disppc ((unsigned char *) addr, 0, len, bedbug_puts, F_RADHEX);
103 dis_last_addr = addr + (len * 4);
106 } /* do_bedbug_dis */
108 U_BOOT_CMD (ds, 3, 1, do_bedbug_dis,
109 "disassemble memory",
110 "ds <address> [# instructions]");
112 /* ======================================================================
113 * Entry point from the interpreter to the assembler. Assembles
114 * instructions in consecutive memory locations until a '.' (period) is
115 * entered on a line by itself.
116 * ====================================================================== */
117 int do_bedbug_asm (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
119 long mem_addr; /* Address to assemble into */
120 unsigned long instr; /* Machine code for text */
121 char prompt[15]; /* Prompt string for user input */
122 int asm_err; /* Error code from the assembler */
124 /* -------------------------------------------------- */
128 return CMD_RET_USAGE;
130 printf ("\nEnter '.' when done\n");
131 mem_addr = simple_strtoul (argv[1], NULL, 16);
135 disppc ((unsigned char *) mem_addr, 0, 1, bedbug_puts,
138 sprintf (prompt, "%08lx: ", mem_addr);
139 cli_readline(prompt);
141 if (console_buffer[0] && strcmp (console_buffer, ".")) {
143 asmppc (mem_addr, console_buffer,
145 *(unsigned long *) mem_addr = instr;
148 printf ("*** Error: %s ***\n",
149 asm_error_str (asm_err));
157 } /* do_bedbug_asm */
159 U_BOOT_CMD (as, 2, 0, do_bedbug_asm,
160 "assemble memory", "as <address>");
162 /* ======================================================================
163 * Used to set a break point from the interpreter. Simply calls into the
164 * CPU-specific break point set routine.
165 * ====================================================================== */
167 int do_bedbug_break (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
169 /* -------------------------------------------------- */
170 if (bug_ctx.do_break)
171 (*bug_ctx.do_break) (cmdtp, flag, argc, argv);
174 } /* do_bedbug_break */
176 U_BOOT_CMD (break, 3, 0, do_bedbug_break,
177 "set or clear a breakpoint",
178 " - Set or clear a breakpoint\n"
179 "break <address> - Break at an address\n"
180 "break off <bp#> - Disable breakpoint.\n"
181 "break show - List breakpoints.");
183 /* ======================================================================
184 * Called from the debug interrupt routine. Simply calls the CPU-specific
185 * breakpoint handling routine.
186 * ====================================================================== */
188 void do_bedbug_breakpoint (struct pt_regs *regs)
190 /* -------------------------------------------------- */
192 if (bug_ctx.break_isr)
193 (*bug_ctx.break_isr) (regs);
196 } /* do_bedbug_breakpoint */
200 /* ======================================================================
201 * Called from the CPU-specific breakpoint handling routine. Enter a
202 * mini main loop until the stopped flag is cleared from the breakpoint
205 * This handles the parts of the debugger that are common to all CPU's.
206 * ====================================================================== */
208 void bedbug_main_loop (unsigned long addr, struct pt_regs *regs)
210 int len; /* Length of command line */
211 int flag; /* Command flags */
212 int rc = 0; /* Result from run_command */
213 char prompt_str[20]; /* Prompt string */
214 static char lastcommand[CONFIG_SYS_CBSIZE] = { 0 }; /* previous command */
215 /* -------------------------------------------------- */
218 (*bug_ctx.clear) (bug_ctx.current_bp);
220 printf ("Breakpoint %d: ", bug_ctx.current_bp);
221 disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);
226 sprintf (prompt_str, "BEDBUG.%d =>", bug_ctx.current_bp);
228 /* A miniature main loop */
229 while (bug_ctx.stopped) {
230 len = cli_readline(prompt_str);
232 flag = 0; /* assume no special flags for now */
235 strcpy (lastcommand, console_buffer);
237 flag |= CMD_FLAG_REPEAT;
240 printf ("<INTERRUPT>\n");
242 rc = run_command_repeatable(lastcommand, flag);
245 /* invalid command or not repeatable, forget it */
251 bug_ctx.current_bp = 0;
254 } /* bedbug_main_loop */
258 /* ======================================================================
259 * Interpreter command to continue from a breakpoint. Just clears the
260 * stopped flag in the context so that the breakpoint routine will
262 * ====================================================================== */
263 int do_bedbug_continue (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
265 /* -------------------------------------------------- */
267 if (!bug_ctx.stopped) {
268 printf ("Not at a breakpoint\n");
274 } /* do_bedbug_continue */
276 U_BOOT_CMD (continue, 1, 0, do_bedbug_continue,
277 "continue from a breakpoint",
280 /* ======================================================================
281 * Interpreter command to continue to the next instruction, stepping into
282 * subroutines. Works by calling the find_next_addr() routine to compute
283 * the address passes control to the CPU-specific set breakpoint routine
284 * for the current breakpoint number.
285 * ====================================================================== */
286 int do_bedbug_step (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
288 unsigned long addr; /* Address to stop at */
290 /* -------------------------------------------------- */
292 if (!bug_ctx.stopped) {
293 printf ("Not at a breakpoint\n");
297 if (!find_next_address((unsigned char *) &addr, false, bug_ctx.regs))
301 (*bug_ctx.set) (bug_ctx.current_bp, addr);
305 } /* do_bedbug_step */
307 U_BOOT_CMD (step, 1, 1, do_bedbug_step,
308 "single step execution.",
311 /* ======================================================================
312 * Interpreter command to continue to the next instruction, stepping over
313 * subroutines. Works by calling the find_next_addr() routine to compute
314 * the address passes control to the CPU-specific set breakpoint routine
315 * for the current breakpoint number.
316 * ====================================================================== */
317 int do_bedbug_next (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
319 unsigned long addr; /* Address to stop at */
321 /* -------------------------------------------------- */
323 if (!bug_ctx.stopped) {
324 printf ("Not at a breakpoint\n");
328 if (!find_next_address((unsigned char *) &addr, true, bug_ctx.regs))
332 (*bug_ctx.set) (bug_ctx.current_bp, addr);
336 } /* do_bedbug_next */
338 U_BOOT_CMD (next, 1, 1, do_bedbug_next,
339 "single step execution, stepping over subroutines.",
342 /* ======================================================================
343 * Interpreter command to print the current stack. This assumes an EABI
344 * architecture, so it starts with GPR R1 and works back up the stack.
345 * ====================================================================== */
346 int do_bedbug_stack (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
348 unsigned long sp; /* Stack pointer */
349 unsigned long func; /* LR from stack */
350 int depth; /* Stack iteration level */
351 int skip = 1; /* Flag to skip the first entry */
352 unsigned long top; /* Top of memory address */
354 /* -------------------------------------------------- */
356 if (!bug_ctx.stopped) {
357 printf ("Not at a breakpoint\n");
361 top = gd->bd->bi_memstart + gd->bd->bi_memsize;
364 printf ("Depth PC\n");
365 printf ("----- --------\n");
366 printf ("%5d %08lx\n", depth++, bug_ctx.regs->nip);
368 sp = bug_ctx.regs->gpr[1];
369 func = *(unsigned long *) (sp + 4);
371 while ((func < top) && (sp < top)) {
373 printf ("%5d %08lx\n", depth++, func);
377 sp = *(unsigned long *) sp;
378 func = *(unsigned long *) (sp + 4);
381 } /* do_bedbug_stack */
383 U_BOOT_CMD (where, 1, 1, do_bedbug_stack,
384 "Print the running stack.",
387 /* ======================================================================
388 * Interpreter command to dump the registers. Calls the CPU-specific
389 * show registers routine.
390 * ====================================================================== */
391 int do_bedbug_rdump (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
393 /* -------------------------------------------------- */
395 if (!bug_ctx.stopped) {
396 printf ("Not at a breakpoint\n");
400 show_regs (bug_ctx.regs);
402 } /* do_bedbug_rdump */
404 U_BOOT_CMD (rdump, 1, 1, do_bedbug_rdump,
405 "Show registers.", "");
406 /* ====================================================================== */
410 * Copyright (c) 2001 William L. Pitts
411 * All rights reserved.
413 * Redistribution and use in source and binary forms are freely
414 * permitted provided that the above copyright notice and this
415 * paragraph and the following disclaimer are duplicated in all
418 * This software is provided "AS IS" and without any express or
419 * implied warranties, including, without limitation, the implied
420 * warranties of merchantability and fitness for a particular