[people/ms/u-boot.git] / common / cmd_bedbug.c

/*
 * BedBug Functions
 */

#include <common.h>
#include <cli.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));

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 * const 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)
		return CMD_RET_USAGE;

	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]");

/* ======================================================================
 * 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 * const 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)
		return CMD_RET_USAGE;

	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);
		cli_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>");

/* ======================================================================
 * 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 * const 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.");

/* ======================================================================
 * 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 = cli_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_repeatable(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 * const 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",
	    "");

/* ======================================================================
 * 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 * const 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.",
	    "");

/* ======================================================================
 * 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 * const 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.",
	    "");

/* ======================================================================
 * 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 * const 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.",
	    "");

/* ======================================================================
 * 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 * const 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.", "");
/* ====================================================================== */


/*
 * 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.
 */
Commit	Line	Data
47d1a6e1 WD	1	/*
	2	* BedBug Functions
	3	*/
	4
	5	#include <common.h>
18d66533	6	#include <cli.h>
47d1a6e1 WD	7	#include <command.h>
	8	#include <linux/ctype.h>
	9	#include <net.h>
8bde7f77	10	#include <bedbug/type.h>
47d1a6e1 WD	11	#include <bedbug/bedbug.h>
	12	#include <bedbug/regs.h>
	13	#include <bedbug/ppc.h>
47d1a6e1	14
d87080b7 WD	15	DECLARE_GLOBAL_DATA_PTR;
d87080b7 WD	16
d87080b7 WD	17	extern void show_regs __P ((struct pt_regs *));
d87080b7 WD	18	extern int run_command __P ((const char *, int));
47d1a6e1	19
d87080b7 WD	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 */
e1bf824d	23
d87080b7	24
47d1a6e1 WD	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
d87080b7	30	int bedbug_puts (const char *str)
47d1a6e1	31	{
d87080b7	32	/* -------------------------------------------------- */
47d1a6e1	33
d87080b7 WD	34	printf ("%s\r\n", str);
	35	return 0;
	36	} /* bedbug_puts */
e1bf824d	37
47d1a6e1 WD	38
47d1a6e1 WD	39
47d1a6e1 WD	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
d87080b7	46	void bedbug_init (void)
47d1a6e1	47	{
d87080b7	48	/* -------------------------------------------------- */
47d1a6e1 WD	49
47d1a6e1 WD	50	#if defined(CONFIG_4xx)
d87080b7 WD	51	void bedbug405_init (void);
	52
	53	bedbug405_init ();
d126bfbd	54	#elif defined(CONFIG_8xx)
d87080b7 WD	55	void bedbug860_init (void);
	56
	57	bedbug860_init ();
47d1a6e1 WD	58	#endif
	59
	60	#if defined(CONFIG_MPC824X) \|\| defined(CONFIG_MPC8260)
d87080b7 WD	61	/* Processors that are 603e core based */
d87080b7 WD	62	void bedbug603e_init (void);
47d1a6e1	63
d87080b7	64	bedbug603e_init ();
47d1a6e1 WD	65	#endif
47d1a6e1 WD	66
d87080b7 WD	67	return;
d87080b7 WD	68	} /* bedbug_init */
e1bf824d	69
47d1a6e1 WD	70
47d1a6e1 WD	71
47d1a6e1 WD	72	/* ======================================================================
	73	* Entry point from the interpreter to the disassembler. Repeated calls
	74	* will resume from the last disassembled address.
	75	* ====================================================================== */
54841ab5	76	int do_bedbug_dis (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	77	{
d87080b7 WD	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
47e26b1b	87	if (argc < 2)
4c12eeb8	88	return CMD_RET_USAGE;
d87080b7 WD	89
	90	if ((flag & CMD_FLAG_REPEAT) == 0) {
	91	/* New command */
	92	addr = simple_strtoul (argv[1], NULL, 16);
	93
	94	/* If an extra param is given then it is the length */
	95	if (argc > 2)
	96	len = simple_strtoul (argv[2], NULL, 16);
	97	}
	98
	99	/* Run the disassembler */
	100	disppc ((unsigned char *) addr, 0, len, bedbug_puts, F_RADHEX);
	101
	102	dis_last_addr = addr + (len * 4);
	103	dis_last_len = len;
	104	return 0;
	105	} /* do_bedbug_dis */
	106
	107	U_BOOT_CMD (ds, 3, 1, do_bedbug_dis,
2fb2604d	108	"disassemble memory",
a89c33db	109	"ds <address> [# instructions]");
e1bf824d	110
47d1a6e1 WD	111	/* ======================================================================
	112	* Entry point from the interpreter to the assembler. Assembles
	113	* instructions in consecutive memory locations until a '.' (period) is
	114	* entered on a line by itself.
	115	* ====================================================================== */
54841ab5	116	int do_bedbug_asm (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	117	{
d87080b7 WD	118	long mem_addr; /* Address to assemble into */
	119	unsigned long instr; /* Machine code for text */
	120	char prompt[15]; /* Prompt string for user input */
	121	int asm_err; /* Error code from the assembler */
	122
	123	/* -------------------------------------------------- */
	124	int rcode = 0;
	125
47e26b1b	126	if (argc < 2)
4c12eeb8	127	return CMD_RET_USAGE;
d87080b7 WD	128
	129	printf ("\nEnter '.' when done\n");
	130	mem_addr = simple_strtoul (argv[1], NULL, 16);
	131
	132	while (1) {
	133	putc ('\n');
	134	disppc ((unsigned char *) mem_addr, 0, 1, bedbug_puts,
	135	F_RADHEX);
	136
	137	sprintf (prompt, "%08lx: ", mem_addr);
e1bf824d	138	cli_readline(prompt);
d87080b7 WD	139
	140	if (console_buffer[0] && strcmp (console_buffer, ".")) {
	141	if ((instr =
	142	asmppc (mem_addr, console_buffer,
	143	&asm_err)) != 0) {
	144	(unsigned long ) mem_addr = instr;
	145	mem_addr += 4;
	146	} else {
	147	printf ("* Error: %s *\n",
	148	asm_error_str (asm_err));
	149	rcode = 1;
	150	}
	151	} else {
	152	break;
	153	}
	154	}
	155	return rcode;
	156	} /* do_bedbug_asm */
	157
	158	U_BOOT_CMD (as, 2, 0, do_bedbug_asm,
a89c33db	159	"assemble memory", "as <address>");
e1bf824d	160
47d1a6e1 WD	161	/* ======================================================================
	162	* Used to set a break point from the interpreter. Simply calls into the
	163	* CPU-specific break point set routine.
	164	* ====================================================================== */
	165
54841ab5	166	int do_bedbug_break (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	167	{
d87080b7 WD	168	/* -------------------------------------------------- */
	169	if (bug_ctx.do_break)
	170	(*bug_ctx.do_break) (cmdtp, flag, argc, argv);
	171	return 0;
	172
	173	} /* do_bedbug_break */
	174
	175	U_BOOT_CMD (break, 3, 0, do_bedbug_break,
2fb2604d	176	"set or clear a breakpoint",
d87080b7 WD	177	" - Set or clear a breakpoint\n"
	178	"break <address> - Break at an address\n"
	179	"break off <bp#> - Disable breakpoint.\n"
a89c33db	180	"break show - List breakpoints.");
e1bf824d	181
47d1a6e1 WD	182	/* ======================================================================
	183	* Called from the debug interrupt routine. Simply calls the CPU-specific
	184	* breakpoint handling routine.
	185	* ====================================================================== */
	186
	187	void do_bedbug_breakpoint (struct pt_regs *regs)
	188	{
d87080b7	189	/* -------------------------------------------------- */
47d1a6e1	190
d87080b7 WD	191	if (bug_ctx.break_isr)
d87080b7 WD	192	(*bug_ctx.break_isr) (regs);
47d1a6e1	193
d87080b7 WD	194	return;
d87080b7 WD	195	} /* do_bedbug_breakpoint */
e1bf824d	196
47d1a6e1 WD	197
47d1a6e1 WD	198
47d1a6e1 WD	199	/* ======================================================================
	200	* Called from the CPU-specific breakpoint handling routine. Enter a
	201	* mini main loop until the stopped flag is cleared from the breakpoint
	202	* context.
	203	*
	204	* This handles the parts of the debugger that are common to all CPU's.
	205	* ====================================================================== */
	206
d87080b7	207	void bedbug_main_loop (unsigned long addr, struct pt_regs *regs)
47d1a6e1	208	{
d87080b7 WD	209	int len; /* Length of command line */
	210	int flag; /* Command flags */
	211	int rc = 0; /* Result from run_command */
	212	char prompt_str[20]; /* Prompt string */
6d0f6bcf	213	static char lastcommand[CONFIG_SYS_CBSIZE] = { 0 }; /* previous command */
d87080b7	214	/* -------------------------------------------------- */
47d1a6e1	215
d87080b7 WD	216	if (bug_ctx.clear)
d87080b7 WD	217	(*bug_ctx.clear) (bug_ctx.current_bp);
47d1a6e1	218
d87080b7 WD	219	printf ("Breakpoint %d: ", bug_ctx.current_bp);
d87080b7 WD	220	disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);
47d1a6e1	221
d87080b7 WD	222	bug_ctx.stopped = 1;
d87080b7 WD	223	bug_ctx.regs = regs;
47d1a6e1	224
d87080b7	225	sprintf (prompt_str, "BEDBUG.%d =>", bug_ctx.current_bp);
47d1a6e1	226
d87080b7 WD	227	/* A miniature main loop */
d87080b7 WD	228	while (bug_ctx.stopped) {
e1bf824d	229	len = cli_readline(prompt_str);
47d1a6e1	230
d87080b7	231	flag = 0; /* assume no special flags for now */
47d1a6e1	232
d87080b7 WD	233	if (len > 0)
	234	strcpy (lastcommand, console_buffer);
	235	else if (len == 0)
	236	flag \|= CMD_FLAG_REPEAT;
47d1a6e1	237
d87080b7 WD	238	if (len == -1)
	239	printf ("<INTERRUPT>\n");
	240	else
52715f89	241	rc = run_command_repeatable(lastcommand, flag);
47d1a6e1	242
d87080b7 WD	243	if (rc <= 0) {
	244	/* invalid command or not repeatable, forget it */
	245	lastcommand[0] = 0;
	246	}
	247	}
47d1a6e1	248
d87080b7 WD	249	bug_ctx.regs = NULL;
d87080b7 WD	250	bug_ctx.current_bp = 0;
47d1a6e1	251
d87080b7 WD	252	return;
d87080b7 WD	253	} /* bedbug_main_loop */
e1bf824d	254
47d1a6e1 WD	255
47d1a6e1 WD	256
47d1a6e1 WD	257	/* ======================================================================
	258	* Interpreter command to continue from a breakpoint. Just clears the
	259	* stopped flag in the context so that the breakpoint routine will
	260	* return.
	261	* ====================================================================== */
54841ab5	262	int do_bedbug_continue (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	263	{
d87080b7 WD	264	/* -------------------------------------------------- */
	265
	266	if (!bug_ctx.stopped) {
	267	printf ("Not at a breakpoint\n");
	268	return 1;
	269	}
	270
	271	bug_ctx.stopped = 0;
	272	return 0;
	273	} /* do_bedbug_continue */
	274
	275	U_BOOT_CMD (continue, 1, 0, do_bedbug_continue,
2fb2604d	276	"continue from a breakpoint",
a89c33db	277	"");
e1bf824d	278
47d1a6e1 WD	279	/* ======================================================================
	280	* Interpreter command to continue to the next instruction, stepping into
	281	* subroutines. Works by calling the find_next_addr() routine to compute
	282	* the address passes control to the CPU-specific set breakpoint routine
	283	* for the current breakpoint number.
	284	* ====================================================================== */
54841ab5	285	int do_bedbug_step (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	286	{
d87080b7 WD	287	unsigned long addr; /* Address to stop at */
	288
	289	/* -------------------------------------------------- */
	290
	291	if (!bug_ctx.stopped) {
	292	printf ("Not at a breakpoint\n");
	293	return 1;
	294	}
	295
472d5460	296	if (!find_next_address((unsigned char *) &addr, false, bug_ctx.regs))
d87080b7 WD	297	return 1;
	298
	299	if (bug_ctx.set)
	300	(*bug_ctx.set) (bug_ctx.current_bp, addr);
	301
	302	bug_ctx.stopped = 0;
	303	return 0;
	304	} /* do_bedbug_step */
	305
	306	U_BOOT_CMD (step, 1, 1, do_bedbug_step,
2fb2604d	307	"single step execution.",
a89c33db	308	"");
e1bf824d	309
47d1a6e1 WD	310	/* ======================================================================
	311	* Interpreter command to continue to the next instruction, stepping over
	312	* subroutines. Works by calling the find_next_addr() routine to compute
	313	* the address passes control to the CPU-specific set breakpoint routine
	314	* for the current breakpoint number.
	315	* ====================================================================== */
54841ab5	316	int do_bedbug_next (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	317	{
d87080b7 WD	318	unsigned long addr; /* Address to stop at */
	319
	320	/* -------------------------------------------------- */
	321
	322	if (!bug_ctx.stopped) {
	323	printf ("Not at a breakpoint\n");
	324	return 1;
	325	}
	326
472d5460	327	if (!find_next_address((unsigned char *) &addr, true, bug_ctx.regs))
d87080b7 WD	328	return 1;
	329
	330	if (bug_ctx.set)
	331	(*bug_ctx.set) (bug_ctx.current_bp, addr);
	332
	333	bug_ctx.stopped = 0;
	334	return 0;
	335	} /* do_bedbug_next */
	336
	337	U_BOOT_CMD (next, 1, 1, do_bedbug_next,
2fb2604d	338	"single step execution, stepping over subroutines.",
a89c33db	339	"");
e1bf824d	340
47d1a6e1 WD	341	/* ======================================================================
	342	* Interpreter command to print the current stack. This assumes an EABI
	343	* architecture, so it starts with GPR R1 and works back up the stack.
	344	* ====================================================================== */
54841ab5	345	int do_bedbug_stack (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	346	{
d87080b7 WD	347	unsigned long sp; /* Stack pointer */
	348	unsigned long func; /* LR from stack */
	349	int depth; /* Stack iteration level */
	350	int skip = 1; /* Flag to skip the first entry */
	351	unsigned long top; /* Top of memory address */
	352
	353	/* -------------------------------------------------- */
	354
	355	if (!bug_ctx.stopped) {
	356	printf ("Not at a breakpoint\n");
	357	return 1;
	358	}
	359
	360	top = gd->bd->bi_memstart + gd->bd->bi_memsize;
	361	depth = 0;
	362
	363	printf ("Depth PC\n");
	364	printf ("----- --------\n");
	365	printf ("%5d %08lx\n", depth++, bug_ctx.regs->nip);
	366
	367	sp = bug_ctx.regs->gpr[1];
	368	func = (unsigned long ) (sp + 4);
	369
	370	while ((func < top) && (sp < top)) {
	371	if (!skip)
	372	printf ("%5d %08lx\n", depth++, func);
	373	else
	374	--skip;
	375
	376	sp = (unsigned long ) sp;
	377	func = (unsigned long ) (sp + 4);
	378	}
	379	return 0;
	380	} /* do_bedbug_stack */
	381
	382	U_BOOT_CMD (where, 1, 1, do_bedbug_stack,
2fb2604d	383	"Print the running stack.",
a89c33db	384	"");
e1bf824d	385
47d1a6e1 WD	386	/* ======================================================================
	387	* Interpreter command to dump the registers. Calls the CPU-specific
	388	* show registers routine.
	389	* ====================================================================== */
54841ab5	390	int do_bedbug_rdump (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	391	{
d87080b7 WD	392	/* -------------------------------------------------- */
	393
	394	if (!bug_ctx.stopped) {
	395	printf ("Not at a breakpoint\n");
	396	return 1;
	397	}
	398
	399	show_regs (bug_ctx.regs);
	400	return 0;
	401	} /* do_bedbug_rdump */
	402
	403	U_BOOT_CMD (rdump, 1, 1, do_bedbug_rdump,
a89c33db	404	"Show registers.", "");
47d1a6e1	405	/* ====================================================================== */
47d1a6e1 WD	406
	407
	408	/*
	409	* Copyright (c) 2001 William L. Pitts
	410	* All rights reserved.
	411	*
	412	* Redistribution and use in source and binary forms are freely
	413	* permitted provided that the above copyright notice and this
	414	* paragraph and the following disclaimer are duplicated in all
	415	* such forms.
	416	*
	417	* This software is provided "AS IS" and without any express or
	418	* implied warranties, including, without limitation, the implied
	419	* warranties of merchantability and fitness for a particular
	420	* purpose.
	421	*/