[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));
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    */
\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 *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");
\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 *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");
\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 *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");
\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 *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");
\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 *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");
\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 *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");
\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 *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");
\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 *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.
 */
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 WD	18	extern char console_buffer[];
47d1a6e1 WD	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 */
47d1a6e1	23	\f
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 */
	37	\f
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;
	68	} /* bedbug_init */
	69	\f
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	* ====================================================================== */
d87080b7	76	int do_bedbug_dis (cmd_tbl_t * cmdtp, int flag, int argc, char *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
	87	if (argc < 2) {
62c3ae7c	88	cmd_usage(cmdtp);
d87080b7 WD	89	return 1;
	90	}
	91
	92	if ((flag & CMD_FLAG_REPEAT) == 0) {
	93	/* New command */
	94	addr = simple_strtoul (argv[1], NULL, 16);
	95
	96	/* If an extra param is given then it is the length */
	97	if (argc > 2)
	98	len = simple_strtoul (argv[2], NULL, 16);
	99	}
	100
	101	/* Run the disassembler */
	102	disppc ((unsigned char *) addr, 0, len, bedbug_puts, F_RADHEX);
	103
	104	dis_last_addr = addr + (len * 4);
	105	dis_last_len = len;
	106	return 0;
	107	} /* do_bedbug_dis */
	108
	109	U_BOOT_CMD (ds, 3, 1, do_bedbug_dis,
2fb2604d	110	"disassemble memory",
d87080b7	111	"ds <address> [# instructions]\n");
47d1a6e1 WD	112	\f
	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	* ====================================================================== */
d87080b7	118	int do_bedbug_asm (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	119	{
d87080b7 WD	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 */
	124
	125	/* -------------------------------------------------- */
	126	int rcode = 0;
	127
	128	if (argc < 2) {
62c3ae7c	129	cmd_usage(cmdtp);
d87080b7 WD	130	return 1;
	131	}
	132
	133	printf ("\nEnter '.' when done\n");
	134	mem_addr = simple_strtoul (argv[1], NULL, 16);
	135
	136	while (1) {
	137	putc ('\n');
	138	disppc ((unsigned char *) mem_addr, 0, 1, bedbug_puts,
	139	F_RADHEX);
	140
	141	sprintf (prompt, "%08lx: ", mem_addr);
	142	readline (prompt);
	143
	144	if (console_buffer[0] && strcmp (console_buffer, ".")) {
	145	if ((instr =
	146	asmppc (mem_addr, console_buffer,
	147	&asm_err)) != 0) {
	148	(unsigned long ) mem_addr = instr;
	149	mem_addr += 4;
	150	} else {
	151	printf ("* Error: %s *\n",
	152	asm_error_str (asm_err));
	153	rcode = 1;
	154	}
	155	} else {
	156	break;
	157	}
	158	}
	159	return rcode;
	160	} /* do_bedbug_asm */
	161
	162	U_BOOT_CMD (as, 2, 0, do_bedbug_asm,
2fb2604d	163	"assemble memory", "as <address>\n");
47d1a6e1 WD	164	\f
	165	/* ======================================================================
	166	* Used to set a break point from the interpreter. Simply calls into the
	167	* CPU-specific break point set routine.
	168	* ====================================================================== */
	169
d87080b7	170	int do_bedbug_break (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	171	{
d87080b7 WD	172	/* -------------------------------------------------- */
	173	if (bug_ctx.do_break)
	174	(*bug_ctx.do_break) (cmdtp, flag, argc, argv);
	175	return 0;
	176
	177	} /* do_bedbug_break */
	178
	179	U_BOOT_CMD (break, 3, 0, do_bedbug_break,
2fb2604d	180	"set or clear a breakpoint",
d87080b7 WD	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.\n");
47d1a6e1 WD	185	\f
	186	/* ======================================================================
	187	* Called from the debug interrupt routine. Simply calls the CPU-specific
	188	* breakpoint handling routine.
	189	* ====================================================================== */
	190
	191	void do_bedbug_breakpoint (struct pt_regs *regs)
	192	{
d87080b7	193	/* -------------------------------------------------- */
47d1a6e1	194
d87080b7 WD	195	if (bug_ctx.break_isr)
d87080b7 WD	196	(*bug_ctx.break_isr) (regs);
47d1a6e1	197
d87080b7 WD	198	return;
	199	} /* do_bedbug_breakpoint */
	200	\f
47d1a6e1 WD	201
47d1a6e1 WD	202
47d1a6e1 WD	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
	206	* context.
	207	*
	208	* This handles the parts of the debugger that are common to all CPU's.
	209	* ====================================================================== */
	210
d87080b7	211	void bedbug_main_loop (unsigned long addr, struct pt_regs *regs)
47d1a6e1	212	{
d87080b7 WD	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 */
6d0f6bcf	217	static char lastcommand[CONFIG_SYS_CBSIZE] = { 0 }; /* previous command */
d87080b7	218	/* -------------------------------------------------- */
47d1a6e1	219
d87080b7 WD	220	if (bug_ctx.clear)
d87080b7 WD	221	(*bug_ctx.clear) (bug_ctx.current_bp);
47d1a6e1	222
d87080b7 WD	223	printf ("Breakpoint %d: ", bug_ctx.current_bp);
d87080b7 WD	224	disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);
47d1a6e1	225
d87080b7 WD	226	bug_ctx.stopped = 1;
d87080b7 WD	227	bug_ctx.regs = regs;
47d1a6e1	228
d87080b7	229	sprintf (prompt_str, "BEDBUG.%d =>", bug_ctx.current_bp);
47d1a6e1	230
d87080b7 WD	231	/* A miniature main loop */
	232	while (bug_ctx.stopped) {
	233	len = readline (prompt_str);
47d1a6e1	234
d87080b7	235	flag = 0; /* assume no special flags for now */
47d1a6e1	236
d87080b7 WD	237	if (len > 0)
	238	strcpy (lastcommand, console_buffer);
	239	else if (len == 0)
	240	flag \|= CMD_FLAG_REPEAT;
47d1a6e1	241
d87080b7 WD	242	if (len == -1)
	243	printf ("<INTERRUPT>\n");
	244	else
	245	rc = run_command (lastcommand, flag);
47d1a6e1	246
d87080b7 WD	247	if (rc <= 0) {
	248	/* invalid command or not repeatable, forget it */
	249	lastcommand[0] = 0;
	250	}
	251	}
47d1a6e1	252
d87080b7 WD	253	bug_ctx.regs = NULL;
d87080b7 WD	254	bug_ctx.current_bp = 0;
47d1a6e1	255
d87080b7 WD	256	return;
	257	} /* bedbug_main_loop */
	258	\f
47d1a6e1 WD	259
47d1a6e1 WD	260
47d1a6e1 WD	261	/* ======================================================================
	262	* Interpreter command to continue from a breakpoint. Just clears the
	263	* stopped flag in the context so that the breakpoint routine will
	264	* return.
	265	* ====================================================================== */
d87080b7	266	int do_bedbug_continue (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	267	{
d87080b7 WD	268	/* -------------------------------------------------- */
	269
	270	if (!bug_ctx.stopped) {
	271	printf ("Not at a breakpoint\n");
	272	return 1;
	273	}
	274
	275	bug_ctx.stopped = 0;
	276	return 0;
	277	} /* do_bedbug_continue */
	278
	279	U_BOOT_CMD (continue, 1, 0, do_bedbug_continue,
2fb2604d	280	"continue from a breakpoint",
d87080b7	281	" - continue from a breakpoint.\n");
47d1a6e1 WD	282	\f
	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	* ====================================================================== */
d87080b7	289	int do_bedbug_step (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	290	{
d87080b7 WD	291	unsigned long addr; /* Address to stop at */
	292
	293	/* -------------------------------------------------- */
	294
	295	if (!bug_ctx.stopped) {
	296	printf ("Not at a breakpoint\n");
	297	return 1;
	298	}
	299
	300	if (!find_next_address ((unsigned char *) &addr, FALSE, bug_ctx.regs))
	301	return 1;
	302
	303	if (bug_ctx.set)
	304	(*bug_ctx.set) (bug_ctx.current_bp, addr);
	305
	306	bug_ctx.stopped = 0;
	307	return 0;
	308	} /* do_bedbug_step */
	309
	310	U_BOOT_CMD (step, 1, 1, do_bedbug_step,
2fb2604d	311	"single step execution.",
d87080b7	312	" - single step execution.\n");
47d1a6e1 WD	313	\f
	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	* ====================================================================== */
d87080b7	320	int do_bedbug_next (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	321	{
d87080b7 WD	322	unsigned long addr; /* Address to stop at */
	323
	324	/* -------------------------------------------------- */
	325
	326	if (!bug_ctx.stopped) {
	327	printf ("Not at a breakpoint\n");
	328	return 1;
	329	}
	330
	331	if (!find_next_address ((unsigned char *) &addr, TRUE, bug_ctx.regs))
	332	return 1;
	333
	334	if (bug_ctx.set)
	335	(*bug_ctx.set) (bug_ctx.current_bp, addr);
	336
	337	bug_ctx.stopped = 0;
	338	return 0;
	339	} /* do_bedbug_next */
	340
	341	U_BOOT_CMD (next, 1, 1, do_bedbug_next,
2fb2604d	342	"single step execution, stepping over subroutines.",
d87080b7	343	" - single step execution, stepping over subroutines.\n");
47d1a6e1 WD	344	\f
	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	* ====================================================================== */
d87080b7	349	int do_bedbug_stack (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	350	{
d87080b7 WD	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 */
	356
	357	/* -------------------------------------------------- */
	358
	359	if (!bug_ctx.stopped) {
	360	printf ("Not at a breakpoint\n");
	361	return 1;
	362	}
	363
	364	top = gd->bd->bi_memstart + gd->bd->bi_memsize;
	365	depth = 0;
	366
	367	printf ("Depth PC\n");
	368	printf ("----- --------\n");
	369	printf ("%5d %08lx\n", depth++, bug_ctx.regs->nip);
	370
	371	sp = bug_ctx.regs->gpr[1];
	372	func = (unsigned long ) (sp + 4);
	373
	374	while ((func < top) && (sp < top)) {
	375	if (!skip)
	376	printf ("%5d %08lx\n", depth++, func);
	377	else
	378	--skip;
	379
	380	sp = (unsigned long ) sp;
	381	func = (unsigned long ) (sp + 4);
	382	}
	383	return 0;
	384	} /* do_bedbug_stack */
	385
	386	U_BOOT_CMD (where, 1, 1, do_bedbug_stack,
2fb2604d	387	"Print the running stack.",
d87080b7	388	" - Print the running stack.\n");
47d1a6e1 WD	389	\f
	390	/* ======================================================================
	391	* Interpreter command to dump the registers. Calls the CPU-specific
	392	* show registers routine.
	393	* ====================================================================== */
d87080b7	394	int do_bedbug_rdump (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	395	{
d87080b7 WD	396	/* -------------------------------------------------- */
	397
	398	if (!bug_ctx.stopped) {
	399	printf ("Not at a breakpoint\n");
	400	return 1;
	401	}
	402
	403	show_regs (bug_ctx.regs);
	404	return 0;
	405	} /* do_bedbug_rdump */
	406
	407	U_BOOT_CMD (rdump, 1, 1, do_bedbug_rdump,
2fb2604d	408	"Show registers.", " - Show registers.\n");
47d1a6e1	409	/* ====================================================================== */
47d1a6e1 WD	410
	411
	412	/*
	413	* Copyright (c) 2001 William L. Pitts
	414	* All rights reserved.
	415	*
	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
	419	* such forms.
	420	*
	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
	424	* purpose.
	425	*/