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

/*
 * 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));

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

/* ======================================================================
 * 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 */
\f


/* ======================================================================
 * 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 */
\f


/* ======================================================================
 * 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]");
\f
/* ======================================================================
 * 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);
		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>");
\f
/* ======================================================================
 * 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.");
\f
/* ======================================================================
 * 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 */
\f


/* ======================================================================
 * 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 */
\f


/* ======================================================================
 * 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",
	    "");
\f
/* ======================================================================
 * 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.",
	    "");
\f
/* ======================================================================
 * 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.",
	    "");
\f
/* ======================================================================
 * 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.",
	    "");
\f
/* ======================================================================
 * 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>
	6	#include <command.h>
	7	#include <linux/ctype.h>
	8	#include <net.h>
8bde7f77	9	#include <bedbug/type.h>
47d1a6e1 WD	10	#include <bedbug/bedbug.h>
	11	#include <bedbug/regs.h>
	12	#include <bedbug/ppc.h>
47d1a6e1	13
d87080b7 WD	14	DECLARE_GLOBAL_DATA_PTR;
d87080b7 WD	15
d87080b7 WD	16	extern void show_regs __P ((struct pt_regs *));
d87080b7 WD	17	extern int run_command __P ((const char *, int));
47d1a6e1	18
d87080b7 WD	19	ulong dis_last_addr = 0; /* Last address disassembled */
	20	ulong dis_last_len = 20; /* Default disassembler length */
	21	CPU_DEBUG_CTX bug_ctx; /* Bedbug context structure */
47d1a6e1	22	\f
d87080b7	23
47d1a6e1 WD	24	/* ======================================================================
	25	* U-Boot's puts function does not append a newline, so the bedbug stuff
	26	* will use this for the output of the dis/assembler.
	27	* ====================================================================== */
	28
d87080b7	29	int bedbug_puts (const char *str)
47d1a6e1	30	{
d87080b7	31	/* -------------------------------------------------- */
47d1a6e1	32
d87080b7 WD	33	printf ("%s\r\n", str);
	34	return 0;
	35	} /* bedbug_puts */
	36	\f
47d1a6e1 WD	37
47d1a6e1 WD	38
47d1a6e1 WD	39	/* ======================================================================
	40	* Initialize the bug_ctx structure used by the bedbug debugger. This is
	41	* specific to the CPU since each has different debug registers and
	42	* settings.
	43	* ====================================================================== */
	44
d87080b7	45	void bedbug_init (void)
47d1a6e1	46	{
d87080b7	47	/* -------------------------------------------------- */
47d1a6e1 WD	48
47d1a6e1 WD	49	#if defined(CONFIG_4xx)
d87080b7 WD	50	void bedbug405_init (void);
	51
	52	bedbug405_init ();
d126bfbd	53	#elif defined(CONFIG_8xx)
d87080b7 WD	54	void bedbug860_init (void);
	55
	56	bedbug860_init ();
47d1a6e1 WD	57	#endif
	58
	59	#if defined(CONFIG_MPC824X) \|\| defined(CONFIG_MPC8260)
d87080b7 WD	60	/* Processors that are 603e core based */
d87080b7 WD	61	void bedbug603e_init (void);
47d1a6e1	62
d87080b7	63	bedbug603e_init ();
47d1a6e1 WD	64	#endif
47d1a6e1 WD	65
d87080b7 WD	66	return;
	67	} /* bedbug_init */
	68	\f
47d1a6e1 WD	69
47d1a6e1 WD	70
47d1a6e1 WD	71	/* ======================================================================
	72	* Entry point from the interpreter to the disassembler. Repeated calls
	73	* will resume from the last disassembled address.
	74	* ====================================================================== */
54841ab5	75	int do_bedbug_dis (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	76	{
d87080b7 WD	77	ulong addr; /* Address to start disassembly from */
	78	ulong len; /* # of instructions to disassemble */
	79
	80	/* -------------------------------------------------- */
	81
	82	/* Setup to go from the last address if none is given */
	83	addr = dis_last_addr;
	84	len = dis_last_len;
	85
47e26b1b	86	if (argc < 2)
4c12eeb8	87	return CMD_RET_USAGE;
d87080b7 WD	88
	89	if ((flag & CMD_FLAG_REPEAT) == 0) {
	90	/* New command */
	91	addr = simple_strtoul (argv[1], NULL, 16);
	92
	93	/* If an extra param is given then it is the length */
	94	if (argc > 2)
	95	len = simple_strtoul (argv[2], NULL, 16);
	96	}
	97
	98	/* Run the disassembler */
	99	disppc ((unsigned char *) addr, 0, len, bedbug_puts, F_RADHEX);
	100
	101	dis_last_addr = addr + (len * 4);
	102	dis_last_len = len;
	103	return 0;
	104	} /* do_bedbug_dis */
	105
	106	U_BOOT_CMD (ds, 3, 1, do_bedbug_dis,
2fb2604d	107	"disassemble memory",
a89c33db	108	"ds <address> [# instructions]");
47d1a6e1 WD	109	\f
	110	/* ======================================================================
	111	* Entry point from the interpreter to the assembler. Assembles
	112	* instructions in consecutive memory locations until a '.' (period) is
	113	* entered on a line by itself.
	114	* ====================================================================== */
54841ab5	115	int do_bedbug_asm (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	116	{
d87080b7 WD	117	long mem_addr; /* Address to assemble into */
	118	unsigned long instr; /* Machine code for text */
	119	char prompt[15]; /* Prompt string for user input */
	120	int asm_err; /* Error code from the assembler */
	121
	122	/* -------------------------------------------------- */
	123	int rcode = 0;
	124
47e26b1b	125	if (argc < 2)
4c12eeb8	126	return CMD_RET_USAGE;
d87080b7 WD	127
	128	printf ("\nEnter '.' when done\n");
	129	mem_addr = simple_strtoul (argv[1], NULL, 16);
	130
	131	while (1) {
	132	putc ('\n');
	133	disppc ((unsigned char *) mem_addr, 0, 1, bedbug_puts,
	134	F_RADHEX);
	135
	136	sprintf (prompt, "%08lx: ", mem_addr);
	137	readline (prompt);
	138
	139	if (console_buffer[0] && strcmp (console_buffer, ".")) {
	140	if ((instr =
	141	asmppc (mem_addr, console_buffer,
	142	&asm_err)) != 0) {
	143	(unsigned long ) mem_addr = instr;
	144	mem_addr += 4;
	145	} else {
	146	printf ("* Error: %s *\n",
	147	asm_error_str (asm_err));
	148	rcode = 1;
	149	}
	150	} else {
	151	break;
	152	}
	153	}
	154	return rcode;
	155	} /* do_bedbug_asm */
	156
	157	U_BOOT_CMD (as, 2, 0, do_bedbug_asm,
a89c33db	158	"assemble memory", "as <address>");
47d1a6e1 WD	159	\f
	160	/* ======================================================================
	161	* Used to set a break point from the interpreter. Simply calls into the
	162	* CPU-specific break point set routine.
	163	* ====================================================================== */
	164
54841ab5	165	int do_bedbug_break (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	166	{
d87080b7 WD	167	/* -------------------------------------------------- */
	168	if (bug_ctx.do_break)
	169	(*bug_ctx.do_break) (cmdtp, flag, argc, argv);
	170	return 0;
	171
	172	} /* do_bedbug_break */
	173
	174	U_BOOT_CMD (break, 3, 0, do_bedbug_break,
2fb2604d	175	"set or clear a breakpoint",
d87080b7 WD	176	" - Set or clear a breakpoint\n"
	177	"break <address> - Break at an address\n"
	178	"break off <bp#> - Disable breakpoint.\n"
a89c33db	179	"break show - List breakpoints.");
47d1a6e1 WD	180	\f
	181	/* ======================================================================
	182	* Called from the debug interrupt routine. Simply calls the CPU-specific
	183	* breakpoint handling routine.
	184	* ====================================================================== */
	185
	186	void do_bedbug_breakpoint (struct pt_regs *regs)
	187	{
d87080b7	188	/* -------------------------------------------------- */
47d1a6e1	189
d87080b7 WD	190	if (bug_ctx.break_isr)
d87080b7 WD	191	(*bug_ctx.break_isr) (regs);
47d1a6e1	192
d87080b7 WD	193	return;
	194	} /* do_bedbug_breakpoint */
	195	\f
47d1a6e1 WD	196
47d1a6e1 WD	197
47d1a6e1 WD	198	/* ======================================================================
	199	* Called from the CPU-specific breakpoint handling routine. Enter a
	200	* mini main loop until the stopped flag is cleared from the breakpoint
	201	* context.
	202	*
	203	* This handles the parts of the debugger that are common to all CPU's.
	204	* ====================================================================== */
	205
d87080b7	206	void bedbug_main_loop (unsigned long addr, struct pt_regs *regs)
47d1a6e1	207	{
d87080b7 WD	208	int len; /* Length of command line */
	209	int flag; /* Command flags */
	210	int rc = 0; /* Result from run_command */
	211	char prompt_str[20]; /* Prompt string */
6d0f6bcf	212	static char lastcommand[CONFIG_SYS_CBSIZE] = { 0 }; /* previous command */
d87080b7	213	/* -------------------------------------------------- */
47d1a6e1	214
d87080b7 WD	215	if (bug_ctx.clear)
d87080b7 WD	216	(*bug_ctx.clear) (bug_ctx.current_bp);
47d1a6e1	217
d87080b7 WD	218	printf ("Breakpoint %d: ", bug_ctx.current_bp);
d87080b7 WD	219	disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);
47d1a6e1	220
d87080b7 WD	221	bug_ctx.stopped = 1;
d87080b7 WD	222	bug_ctx.regs = regs;
47d1a6e1	223
d87080b7	224	sprintf (prompt_str, "BEDBUG.%d =>", bug_ctx.current_bp);
47d1a6e1	225
d87080b7 WD	226	/* A miniature main loop */
	227	while (bug_ctx.stopped) {
	228	len = readline (prompt_str);
47d1a6e1	229
d87080b7	230	flag = 0; /* assume no special flags for now */
47d1a6e1	231
d87080b7 WD	232	if (len > 0)
	233	strcpy (lastcommand, console_buffer);
	234	else if (len == 0)
	235	flag \|= CMD_FLAG_REPEAT;
47d1a6e1	236
d87080b7 WD	237	if (len == -1)
	238	printf ("<INTERRUPT>\n");
	239	else
53071532	240	rc = run_command(lastcommand, flag);
47d1a6e1	241
d87080b7 WD	242	if (rc <= 0) {
	243	/* invalid command or not repeatable, forget it */
	244	lastcommand[0] = 0;
	245	}
	246	}
47d1a6e1	247
d87080b7 WD	248	bug_ctx.regs = NULL;
d87080b7 WD	249	bug_ctx.current_bp = 0;
47d1a6e1	250
d87080b7 WD	251	return;
	252	} /* bedbug_main_loop */
	253	\f
47d1a6e1 WD	254
47d1a6e1 WD	255
47d1a6e1 WD	256	/* ======================================================================
	257	* Interpreter command to continue from a breakpoint. Just clears the
	258	* stopped flag in the context so that the breakpoint routine will
	259	* return.
	260	* ====================================================================== */
54841ab5	261	int do_bedbug_continue (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	262	{
d87080b7 WD	263	/* -------------------------------------------------- */
	264
	265	if (!bug_ctx.stopped) {
	266	printf ("Not at a breakpoint\n");
	267	return 1;
	268	}
	269
	270	bug_ctx.stopped = 0;
	271	return 0;
	272	} /* do_bedbug_continue */
	273
	274	U_BOOT_CMD (continue, 1, 0, do_bedbug_continue,
2fb2604d	275	"continue from a breakpoint",
a89c33db	276	"");
47d1a6e1 WD	277	\f
	278	/* ======================================================================
	279	* Interpreter command to continue to the next instruction, stepping into
	280	* subroutines. Works by calling the find_next_addr() routine to compute
	281	* the address passes control to the CPU-specific set breakpoint routine
	282	* for the current breakpoint number.
	283	* ====================================================================== */
54841ab5	284	int do_bedbug_step (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	285	{
d87080b7 WD	286	unsigned long addr; /* Address to stop at */
	287
	288	/* -------------------------------------------------- */
	289
	290	if (!bug_ctx.stopped) {
	291	printf ("Not at a breakpoint\n");
	292	return 1;
	293	}
	294
	295	if (!find_next_address ((unsigned char *) &addr, FALSE, bug_ctx.regs))
	296	return 1;
	297
	298	if (bug_ctx.set)
	299	(*bug_ctx.set) (bug_ctx.current_bp, addr);
	300
	301	bug_ctx.stopped = 0;
	302	return 0;
	303	} /* do_bedbug_step */
	304
	305	U_BOOT_CMD (step, 1, 1, do_bedbug_step,
2fb2604d	306	"single step execution.",
a89c33db	307	"");
47d1a6e1 WD	308	\f
	309	/* ======================================================================
	310	* Interpreter command to continue to the next instruction, stepping over
	311	* subroutines. Works by calling the find_next_addr() routine to compute
	312	* the address passes control to the CPU-specific set breakpoint routine
	313	* for the current breakpoint number.
	314	* ====================================================================== */
54841ab5	315	int do_bedbug_next (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	316	{
d87080b7 WD	317	unsigned long addr; /* Address to stop at */
	318
	319	/* -------------------------------------------------- */
	320
	321	if (!bug_ctx.stopped) {
	322	printf ("Not at a breakpoint\n");
	323	return 1;
	324	}
	325
	326	if (!find_next_address ((unsigned char *) &addr, TRUE, bug_ctx.regs))
	327	return 1;
	328
	329	if (bug_ctx.set)
	330	(*bug_ctx.set) (bug_ctx.current_bp, addr);
	331
	332	bug_ctx.stopped = 0;
	333	return 0;
	334	} /* do_bedbug_next */
	335
	336	U_BOOT_CMD (next, 1, 1, do_bedbug_next,
2fb2604d	337	"single step execution, stepping over subroutines.",
a89c33db	338	"");
47d1a6e1 WD	339	\f
	340	/* ======================================================================
	341	* Interpreter command to print the current stack. This assumes an EABI
	342	* architecture, so it starts with GPR R1 and works back up the stack.
	343	* ====================================================================== */
54841ab5	344	int do_bedbug_stack (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	345	{
d87080b7 WD	346	unsigned long sp; /* Stack pointer */
	347	unsigned long func; /* LR from stack */
	348	int depth; /* Stack iteration level */
	349	int skip = 1; /* Flag to skip the first entry */
	350	unsigned long top; /* Top of memory address */
	351
	352	/* -------------------------------------------------- */
	353
	354	if (!bug_ctx.stopped) {
	355	printf ("Not at a breakpoint\n");
	356	return 1;
	357	}
	358
	359	top = gd->bd->bi_memstart + gd->bd->bi_memsize;
	360	depth = 0;
	361
	362	printf ("Depth PC\n");
	363	printf ("----- --------\n");
	364	printf ("%5d %08lx\n", depth++, bug_ctx.regs->nip);
	365
	366	sp = bug_ctx.regs->gpr[1];
	367	func = (unsigned long ) (sp + 4);
	368
	369	while ((func < top) && (sp < top)) {
	370	if (!skip)
	371	printf ("%5d %08lx\n", depth++, func);
	372	else
	373	--skip;
	374
	375	sp = (unsigned long ) sp;
	376	func = (unsigned long ) (sp + 4);
	377	}
	378	return 0;
	379	} /* do_bedbug_stack */
	380
	381	U_BOOT_CMD (where, 1, 1, do_bedbug_stack,
2fb2604d	382	"Print the running stack.",
a89c33db	383	"");
47d1a6e1 WD	384	\f
	385	/* ======================================================================
	386	* Interpreter command to dump the registers. Calls the CPU-specific
	387	* show registers routine.
	388	* ====================================================================== */
54841ab5	389	int do_bedbug_rdump (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
47d1a6e1	390	{
d87080b7 WD	391	/* -------------------------------------------------- */
	392
	393	if (!bug_ctx.stopped) {
	394	printf ("Not at a breakpoint\n");
	395	return 1;
	396	}
	397
	398	show_regs (bug_ctx.regs);
	399	return 0;
	400	} /* do_bedbug_rdump */
	401
	402	U_BOOT_CMD (rdump, 1, 1, do_bedbug_rdump,
a89c33db	403	"Show registers.", "");
47d1a6e1	404	/* ====================================================================== */
47d1a6e1 WD	405
	406
	407	/*
	408	* Copyright (c) 2001 William L. Pitts
	409	* All rights reserved.
	410	*
	411	* Redistribution and use in source and binary forms are freely
	412	* permitted provided that the above copyright notice and this
	413	* paragraph and the following disclaimer are duplicated in all
	414	* such forms.
	415	*
	416	* This software is provided "AS IS" and without any express or
	417	* implied warranties, including, without limitation, the implied
	418	* warranties of merchantability and fitness for a particular
	419	* purpose.
	420	*/