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;
16 extern void show_regs __P ((struct pt_regs *));
17 extern int run_command __P ((const char *, int));
18 extern char console_buffer[];
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 */
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 * ====================================================================== */
30 int bedbug_puts (const char *str)
32 /* -------------------------------------------------- */
34 printf ("%s\r\n", str);
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
44 * ====================================================================== */
46 void bedbug_init (void)
48 /* -------------------------------------------------- */
50 #if defined(CONFIG_4xx)
51 void bedbug405_init (void);
54 #elif defined(CONFIG_8xx)
55 void bedbug860_init (void);
60 #if defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260)
61 /* Processors that are 603e core based */
62 void bedbug603e_init (void);
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 * const argv[])
78 ulong addr; /* Address to start disassembly from */
79 ulong len; /* # of instructions to disassemble */
81 /* -------------------------------------------------- */
83 /* Setup to go from the last address if none is given */
92 if ((flag & CMD_FLAG_REPEAT) == 0) {
94 addr = simple_strtoul (argv[1], NULL, 16);
96 /* If an extra param is given then it is the length */
98 len = simple_strtoul (argv[2], NULL, 16);
101 /* Run the disassembler */
102 disppc ((unsigned char *) addr, 0, len, bedbug_puts, F_RADHEX);
104 dis_last_addr = addr + (len * 4);
107 } /* do_bedbug_dis */
109 U_BOOT_CMD (ds, 3, 1, do_bedbug_dis,
110 "disassemble memory",
111 "ds <address> [# instructions]");
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 * const argv[])
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 */
125 /* -------------------------------------------------- */
133 printf ("\nEnter '.' when done\n");
134 mem_addr = simple_strtoul (argv[1], NULL, 16);
138 disppc ((unsigned char *) mem_addr, 0, 1, bedbug_puts,
141 sprintf (prompt, "%08lx: ", mem_addr);
144 if (console_buffer[0] && strcmp (console_buffer, ".")) {
146 asmppc (mem_addr, console_buffer,
148 *(unsigned long *) mem_addr = instr;
151 printf ("*** Error: %s ***\n",
152 asm_error_str (asm_err));
160 } /* do_bedbug_asm */
162 U_BOOT_CMD (as, 2, 0, do_bedbug_asm,
163 "assemble memory", "as <address>");
165 /* ======================================================================
166 * Used to set a break point from the interpreter. Simply calls into the
167 * CPU-specific break point set routine.
168 * ====================================================================== */
170 int do_bedbug_break (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
172 /* -------------------------------------------------- */
173 if (bug_ctx.do_break)
174 (*bug_ctx.do_break) (cmdtp, flag, argc, argv);
177 } /* do_bedbug_break */
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.");
186 /* ======================================================================
187 * Called from the debug interrupt routine. Simply calls the CPU-specific
188 * breakpoint handling routine.
189 * ====================================================================== */
191 void do_bedbug_breakpoint (struct pt_regs *regs)
193 /* -------------------------------------------------- */
195 if (bug_ctx.break_isr)
196 (*bug_ctx.break_isr) (regs);
199 } /* do_bedbug_breakpoint */
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
208 * This handles the parts of the debugger that are common to all CPU's.
209 * ====================================================================== */
211 void bedbug_main_loop (unsigned long addr, struct pt_regs *regs)
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 /* -------------------------------------------------- */
221 (*bug_ctx.clear) (bug_ctx.current_bp);
223 printf ("Breakpoint %d: ", bug_ctx.current_bp);
224 disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);
229 sprintf (prompt_str, "BEDBUG.%d =>", bug_ctx.current_bp);
231 /* A miniature main loop */
232 while (bug_ctx.stopped) {
233 len = readline (prompt_str);
235 flag = 0; /* assume no special flags for now */
238 strcpy (lastcommand, console_buffer);
240 flag |= CMD_FLAG_REPEAT;
243 printf ("<INTERRUPT>\n");
245 rc = run_command (lastcommand, flag);
248 /* invalid command or not repeatable, forget it */
254 bug_ctx.current_bp = 0;
257 } /* bedbug_main_loop */
261 /* ======================================================================
262 * Interpreter command to continue from a breakpoint. Just clears the
263 * stopped flag in the context so that the breakpoint routine will
265 * ====================================================================== */
266 int do_bedbug_continue (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
268 /* -------------------------------------------------- */
270 if (!bug_ctx.stopped) {
271 printf ("Not at a breakpoint\n");
277 } /* do_bedbug_continue */
279 U_BOOT_CMD (continue, 1, 0, do_bedbug_continue,
280 "continue from a breakpoint",
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 * const argv[])
291 unsigned long addr; /* Address to stop at */
293 /* -------------------------------------------------- */
295 if (!bug_ctx.stopped) {
296 printf ("Not at a breakpoint\n");
300 if (!find_next_address ((unsigned char *) &addr, FALSE, bug_ctx.regs))
304 (*bug_ctx.set) (bug_ctx.current_bp, addr);
308 } /* do_bedbug_step */
310 U_BOOT_CMD (step, 1, 1, do_bedbug_step,
311 "single step execution.",
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 * const argv[])
322 unsigned long addr; /* Address to stop at */
324 /* -------------------------------------------------- */
326 if (!bug_ctx.stopped) {
327 printf ("Not at a breakpoint\n");
331 if (!find_next_address ((unsigned char *) &addr, TRUE, bug_ctx.regs))
335 (*bug_ctx.set) (bug_ctx.current_bp, addr);
339 } /* do_bedbug_next */
341 U_BOOT_CMD (next, 1, 1, do_bedbug_next,
342 "single step execution, stepping over subroutines.",
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 * const argv[])
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 */
357 /* -------------------------------------------------- */
359 if (!bug_ctx.stopped) {
360 printf ("Not at a breakpoint\n");
364 top = gd->bd->bi_memstart + gd->bd->bi_memsize;
367 printf ("Depth PC\n");
368 printf ("----- --------\n");
369 printf ("%5d %08lx\n", depth++, bug_ctx.regs->nip);
371 sp = bug_ctx.regs->gpr[1];
372 func = *(unsigned long *) (sp + 4);
374 while ((func < top) && (sp < top)) {
376 printf ("%5d %08lx\n", depth++, func);
380 sp = *(unsigned long *) sp;
381 func = *(unsigned long *) (sp + 4);
384 } /* do_bedbug_stack */
386 U_BOOT_CMD (where, 1, 1, do_bedbug_stack,
387 "Print the running stack.",
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 * const argv[])
396 /* -------------------------------------------------- */
398 if (!bug_ctx.stopped) {
399 printf ("Not at a breakpoint\n");
403 show_regs (bug_ctx.regs);
405 } /* do_bedbug_rdump */
407 U_BOOT_CMD (rdump, 1, 1, do_bedbug_rdump,
408 "Show registers.", "");
409 /* ====================================================================== */
413 * Copyright (c) 2001 William L. Pitts
414 * All rights reserved.
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
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