summaryrefslogtreecommitdiffstats
path: root/common/cmd_bedbug.c
blob: cd9e720fc6279743cbfad4bb3988063e61a9ab40 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
/*
 * BedBug Functions
 */

#include <common.h>
#include <command.h>
#include <linux/ctype.h>
#include <net.h>
#include <bedbug/type.h>
#include <bedbug/bedbug.h>
#include <bedbug/regs.h>
#include <bedbug/ppc.h>

DECLARE_GLOBAL_DATA_PTR;

extern void show_regs __P ((struct pt_regs *));
extern int run_command __P ((const char *, int));
extern char console_buffer[];

ulong dis_last_addr = 0;	/* Last address disassembled   */
ulong dis_last_len = 20;	/* Default disassembler length */
CPU_DEBUG_CTX bug_ctx;		/* Bedbug context structure    */


/* ======================================================================
 * U-Boot's puts function does not append a newline, so the bedbug stuff
 * will use this for the output of the dis/assembler.
 * ====================================================================== */

int bedbug_puts (const char *str)
{
	/* -------------------------------------------------- */

	printf ("%s\r\n", str);
	return 0;
}				/* bedbug_puts */



/* ======================================================================
 * Initialize the bug_ctx structure used by the bedbug debugger.  This is
 * specific to the CPU since each has different debug registers and
 * settings.
 * ====================================================================== */

void bedbug_init (void)
{
	/* -------------------------------------------------- */

#if defined(CONFIG_4xx)
	void bedbug405_init (void);

	bedbug405_init ();
#elif defined(CONFIG_8xx)
	void bedbug860_init (void);

	bedbug860_init ();
#endif

#if defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260)
	/* Processors that are 603e core based */
	void bedbug603e_init (void);

	bedbug603e_init ();
#endif

	return;
}				/* bedbug_init */



/* ======================================================================
 * Entry point from the interpreter to the disassembler.  Repeated calls
 * will resume from the last disassembled address.
 * ====================================================================== */
int do_bedbug_dis (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	ulong addr;		/* Address to start disassembly from    */
	ulong len;		/* # of instructions to disassemble     */

	/* -------------------------------------------------- */

	/* Setup to go from the last address if none is given */
	addr = dis_last_addr;
	len = dis_last_len;

	if (argc < 2) {
		cmd_usage(cmdtp);
		return 1;
	}

	if ((flag & CMD_FLAG_REPEAT) == 0) {
		/* New command */
		addr = simple_strtoul (argv[1], NULL, 16);

		/* If an extra param is given then it is the length */
		if (argc > 2)
			len = simple_strtoul (argv[2], NULL, 16);
	}

	/* Run the disassembler */
	disppc ((unsigned char *) addr, 0, len, bedbug_puts, F_RADHEX);

	dis_last_addr = addr + (len * 4);
	dis_last_len = len;
	return 0;
}				/* do_bedbug_dis */

U_BOOT_CMD (ds, 3, 1, do_bedbug_dis,
	    "disassemble memory",
	    "ds <address> [# instructions]\n");

/* ======================================================================
 * Entry point from the interpreter to the assembler.  Assembles
 * instructions in consecutive memory locations until a '.' (period) is
 * entered on a line by itself.
 * ====================================================================== */
int do_bedbug_asm (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	long mem_addr;		/* Address to assemble into     */
	unsigned long instr;	/* Machine code for text        */
	char prompt[15];	/* Prompt string for user input */
	int asm_err;		/* Error code from the assembler */

	/* -------------------------------------------------- */
	int rcode = 0;

	if (argc < 2) {
		cmd_usage(cmdtp);
		return 1;
	}

	printf ("\nEnter '.' when done\n");
	mem_addr = simple_strtoul (argv[1], NULL, 16);

	while (1) {
		putc ('\n');
		disppc ((unsigned char *) mem_addr, 0, 1, bedbug_puts,
			F_RADHEX);

		sprintf (prompt, "%08lx:    ", mem_addr);
		readline (prompt);

		if (console_buffer[0] && strcmp (console_buffer, ".")) {
			if ((instr =
			     asmppc (mem_addr, console_buffer,
				     &asm_err)) != 0) {
				*(unsigned long *) mem_addr = instr;
				mem_addr += 4;
			} else {
				printf ("*** Error: %s ***\n",
					asm_error_str (asm_err));
				rcode = 1;
			}
		} else {
			break;
		}
	}
	return rcode;
}				/* do_bedbug_asm */

U_BOOT_CMD (as, 2, 0, do_bedbug_asm,
	    "assemble memory", "as <address>\n");

/* ======================================================================
 * Used to set a break point from the interpreter.  Simply calls into the
 * CPU-specific break point set routine.
 * ====================================================================== */

int do_bedbug_break (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	/* -------------------------------------------------- */
	if (bug_ctx.do_break)
		(*bug_ctx.do_break) (cmdtp, flag, argc, argv);
	return 0;

}				/* do_bedbug_break */

U_BOOT_CMD (break, 3, 0, do_bedbug_break,
	    "set or clear a breakpoint",
	    " - Set or clear a breakpoint\n"
	    "break <address> - Break at an address\n"
	    "break off <bp#> - Disable breakpoint.\n"
	    "break show      - List breakpoints.\n");

/* ======================================================================
 * Called from the debug interrupt routine.  Simply calls the CPU-specific
 * breakpoint handling routine.
 * ====================================================================== */

void do_bedbug_breakpoint (struct pt_regs *regs)
{
	/* -------------------------------------------------- */

	if (bug_ctx.break_isr)
		(*bug_ctx.break_isr) (regs);

	return;
}				/* do_bedbug_breakpoint */



/* ======================================================================
 * Called from the CPU-specific breakpoint handling routine.  Enter a
 * mini main loop until the stopped flag is cleared from the breakpoint
 * context.
 *
 * This handles the parts of the debugger that are common to all CPU's.
 * ====================================================================== */

void bedbug_main_loop (unsigned long addr, struct pt_regs *regs)
{
	int len;		/* Length of command line */
	int flag;		/* Command flags          */
	int rc = 0;		/* Result from run_command */
	char prompt_str[20];	/* Prompt string          */
	static char lastcommand[CONFIG_SYS_CBSIZE] = { 0 };	/* previous command */
	/* -------------------------------------------------- */

	if (bug_ctx.clear)
		(*bug_ctx.clear) (bug_ctx.current_bp);

	printf ("Breakpoint %d: ", bug_ctx.current_bp);
	disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);

	bug_ctx.stopped = 1;
	bug_ctx.regs = regs;

	sprintf (prompt_str, "BEDBUG.%d =>", bug_ctx.current_bp);

	/* A miniature main loop */
	while (bug_ctx.stopped) {
		len = readline (prompt_str);

		flag = 0;	/* assume no special flags for now */

		if (len > 0)
			strcpy (lastcommand, console_buffer);
		else if (len == 0)
			flag |= CMD_FLAG_REPEAT;

		if (len == -1)
			printf ("<INTERRUPT>\n");
		else
			rc = run_command (lastcommand, flag);

		if (rc <= 0) {
			/* invalid command or not repeatable, forget it */
			lastcommand[0] = 0;
		}
	}

	bug_ctx.regs = NULL;
	bug_ctx.current_bp = 0;

	return;
}				/* bedbug_main_loop */



/* ======================================================================
 * Interpreter command to continue from a breakpoint.  Just clears the
 * stopped flag in the context so that the breakpoint routine will
 * return.
 * ====================================================================== */
int do_bedbug_continue (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	/* -------------------------------------------------- */

	if (!bug_ctx.stopped) {
		printf ("Not at a breakpoint\n");
		return 1;
	}

	bug_ctx.stopped = 0;
	return 0;
}				/* do_bedbug_continue */

U_BOOT_CMD (continue, 1, 0, do_bedbug_continue,
	    "continue from a breakpoint",
	    " - continue from a breakpoint.\n");

/* ======================================================================
 * Interpreter command to continue to the next instruction, stepping into
 * subroutines.  Works by calling the find_next_addr() routine to compute
 * the address passes control to the CPU-specific set breakpoint routine
 * for the current breakpoint number.
 * ====================================================================== */
int do_bedbug_step (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	unsigned long addr;	/* Address to stop at */

	/* -------------------------------------------------- */

	if (!bug_ctx.stopped) {
		printf ("Not at a breakpoint\n");
		return 1;
	}

	if (!find_next_address ((unsigned char *) &addr, FALSE, bug_ctx.regs))
		return 1;

	if (bug_ctx.set)
		(*bug_ctx.set) (bug_ctx.current_bp, addr);

	bug_ctx.stopped = 0;
	return 0;
}				/* do_bedbug_step */

U_BOOT_CMD (step, 1, 1, do_bedbug_step,
	    "single step execution.",
	    " - single step execution.\n");

/* ======================================================================
 * Interpreter command to continue to the next instruction, stepping over
 * subroutines.  Works by calling the find_next_addr() routine to compute
 * the address passes control to the CPU-specific set breakpoint routine
 * for the current breakpoint number.
 * ====================================================================== */
int do_bedbug_next (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	unsigned long addr;	/* Address to stop at */

	/* -------------------------------------------------- */

	if (!bug_ctx.stopped) {
		printf ("Not at a breakpoint\n");
		return 1;
	}

	if (!find_next_address ((unsigned char *) &addr, TRUE, bug_ctx.regs))
		return 1;

	if (bug_ctx.set)
		(*bug_ctx.set) (bug_ctx.current_bp, addr);

	bug_ctx.stopped = 0;
	return 0;
}				/* do_bedbug_next */

U_BOOT_CMD (next, 1, 1, do_bedbug_next,
	    "single step execution, stepping over subroutines.",
	    " - single step execution, stepping over subroutines.\n");

/* ======================================================================
 * Interpreter command to print the current stack.  This assumes an EABI
 * architecture, so it starts with GPR R1 and works back up the stack.
 * ====================================================================== */
int do_bedbug_stack (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	unsigned long sp;	/* Stack pointer                */
	unsigned long func;	/* LR from stack                */
	int depth;		/* Stack iteration level        */
	int skip = 1;		/* Flag to skip the first entry */
	unsigned long top;	/* Top of memory address        */

	/* -------------------------------------------------- */

	if (!bug_ctx.stopped) {
		printf ("Not at a breakpoint\n");
		return 1;
	}

	top = gd->bd->bi_memstart + gd->bd->bi_memsize;
	depth = 0;

	printf ("Depth     PC\n");
	printf ("-----  --------\n");
	printf ("%5d  %08lx\n", depth++, bug_ctx.regs->nip);

	sp = bug_ctx.regs->gpr[1];
	func = *(unsigned long *) (sp + 4);

	while ((func < top) && (sp < top)) {
		if (!skip)
			printf ("%5d  %08lx\n", depth++, func);
		else
			--skip;

		sp = *(unsigned long *) sp;
		func = *(unsigned long *) (sp + 4);
	}
	return 0;
}				/* do_bedbug_stack */

U_BOOT_CMD (where, 1, 1, do_bedbug_stack,
	    "Print the running stack.",
	    " - Print the running stack.\n");

/* ======================================================================
 * Interpreter command to dump the registers.  Calls the CPU-specific
 * show registers routine.
 * ====================================================================== */
int do_bedbug_rdump (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	/* -------------------------------------------------- */

	if (!bug_ctx.stopped) {
		printf ("Not at a breakpoint\n");
		return 1;
	}

	show_regs (bug_ctx.regs);
	return 0;
}				/* do_bedbug_rdump */

U_BOOT_CMD (rdump, 1, 1, do_bedbug_rdump,
	    "Show registers.", " - Show registers.\n");
/* ====================================================================== */


/*
 * Copyright (c) 2001 William L. Pitts
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are freely
 * permitted provided that the above copyright notice and this
 * paragraph and the following disclaimer are duplicated in all
 * such forms.
 *
 * This software is provided "AS IS" and without any express or
 * implied warranties, including, without limitation, the implied
 * warranties of merchantability and fitness for a particular
 * purpose.
 */