[J-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;

#ifndef MAX
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#endif

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) {
		printf ("Usage:\n%s\n", cmdtp->usage);
		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,
	    "ds      - disassemble memory\n",
	    "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) {
		printf ("Usage:\n%s\n", cmdtp->usage);
		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,
	    "as      - assemble memory\n", "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,
	    "break   - set or clear a breakpoint\n",
	    " - 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[CFG_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- continue from a breakpoint\n",
	    " - 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,
	    "step    - single step execution.\n",
	    " - 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,
	    "next    - single step execution, stepping over subroutines.\n",
	    " - 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,
	    "where   - Print the running stack.\n",
	    " - 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,
	    "rdump   - Show registers.\n", " - 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
47d1a6e1 WD	16	#ifndef MAX
	17	#define MAX(a,b) ((a) > (b) ? (a) : (b))
	18	#endif
	19
d87080b7 WD	20	extern void show_regs __P ((struct pt_regs *));
d87080b7 WD	21	extern int run_command __P ((const char *, int));
47d1a6e1 WD	22	extern char console_buffer[];
47d1a6e1 WD	23
d87080b7 WD	24	ulong dis_last_addr = 0; /* Last address disassembled */
	25	ulong dis_last_len = 20; /* Default disassembler length */
	26	CPU_DEBUG_CTX bug_ctx; /* Bedbug context structure */
47d1a6e1	27	\f
d87080b7	28
47d1a6e1 WD	29	/* ======================================================================
	30	* U-Boot's puts function does not append a newline, so the bedbug stuff
	31	* will use this for the output of the dis/assembler.
	32	* ====================================================================== */
	33
d87080b7	34	int bedbug_puts (const char *str)
47d1a6e1	35	{
d87080b7	36	/* -------------------------------------------------- */
47d1a6e1	37
d87080b7 WD	38	printf ("%s\r\n", str);
	39	return 0;
	40	} /* bedbug_puts */
	41	\f
47d1a6e1 WD	42
47d1a6e1 WD	43
47d1a6e1 WD	44	/* ======================================================================
	45	* Initialize the bug_ctx structure used by the bedbug debugger. This is
	46	* specific to the CPU since each has different debug registers and
	47	* settings.
	48	* ====================================================================== */
	49
d87080b7	50	void bedbug_init (void)
47d1a6e1	51	{
d87080b7	52	/* -------------------------------------------------- */
47d1a6e1 WD	53
47d1a6e1 WD	54	#if defined(CONFIG_4xx)
d87080b7 WD	55	void bedbug405_init (void);
	56
	57	bedbug405_init ();
d126bfbd	58	#elif defined(CONFIG_8xx)
d87080b7 WD	59	void bedbug860_init (void);
	60
	61	bedbug860_init ();
47d1a6e1 WD	62	#endif
	63
	64	#if defined(CONFIG_MPC824X) \|\| defined(CONFIG_MPC8260)
d87080b7 WD	65	/* Processors that are 603e core based */
d87080b7 WD	66	void bedbug603e_init (void);
47d1a6e1	67
d87080b7	68	bedbug603e_init ();
47d1a6e1 WD	69	#endif
47d1a6e1 WD	70
d87080b7 WD	71	return;
	72	} /* bedbug_init */
	73	\f
47d1a6e1 WD	74
47d1a6e1 WD	75
47d1a6e1 WD	76	/* ======================================================================
	77	* Entry point from the interpreter to the disassembler. Repeated calls
	78	* will resume from the last disassembled address.
	79	* ====================================================================== */
d87080b7	80	int do_bedbug_dis (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	81	{
d87080b7 WD	82	ulong addr; /* Address to start disassembly from */
	83	ulong len; /* # of instructions to disassemble */
	84
	85	/* -------------------------------------------------- */
	86
	87	/* Setup to go from the last address if none is given */
	88	addr = dis_last_addr;
	89	len = dis_last_len;
	90
	91	if (argc < 2) {
	92	printf ("Usage:\n%s\n", cmdtp->usage);
	93	return 1;
	94	}
	95
	96	if ((flag & CMD_FLAG_REPEAT) == 0) {
	97	/* New command */
	98	addr = simple_strtoul (argv[1], NULL, 16);
	99
	100	/* If an extra param is given then it is the length */
	101	if (argc > 2)
	102	len = simple_strtoul (argv[2], NULL, 16);
	103	}
	104
	105	/* Run the disassembler */
	106	disppc ((unsigned char *) addr, 0, len, bedbug_puts, F_RADHEX);
	107
	108	dis_last_addr = addr + (len * 4);
	109	dis_last_len = len;
	110	return 0;
	111	} /* do_bedbug_dis */
	112
	113	U_BOOT_CMD (ds, 3, 1, do_bedbug_dis,
	114	"ds - disassemble memory\n",
	115	"ds <address> [# instructions]\n");
47d1a6e1 WD	116	\f
	117	/* ======================================================================
	118	* Entry point from the interpreter to the assembler. Assembles
	119	* instructions in consecutive memory locations until a '.' (period) is
	120	* entered on a line by itself.
	121	* ====================================================================== */
d87080b7	122	int do_bedbug_asm (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	123	{
d87080b7 WD	124	long mem_addr; /* Address to assemble into */
	125	unsigned long instr; /* Machine code for text */
	126	char prompt[15]; /* Prompt string for user input */
	127	int asm_err; /* Error code from the assembler */
	128
	129	/* -------------------------------------------------- */
	130	int rcode = 0;
	131
	132	if (argc < 2) {
	133	printf ("Usage:\n%s\n", cmdtp->usage);
	134	return 1;
	135	}
	136
	137	printf ("\nEnter '.' when done\n");
	138	mem_addr = simple_strtoul (argv[1], NULL, 16);
	139
	140	while (1) {
	141	putc ('\n');
	142	disppc ((unsigned char *) mem_addr, 0, 1, bedbug_puts,
	143	F_RADHEX);
	144
	145	sprintf (prompt, "%08lx: ", mem_addr);
	146	readline (prompt);
	147
	148	if (console_buffer[0] && strcmp (console_buffer, ".")) {
	149	if ((instr =
	150	asmppc (mem_addr, console_buffer,
	151	&asm_err)) != 0) {
	152	(unsigned long ) mem_addr = instr;
	153	mem_addr += 4;
	154	} else {
	155	printf ("* Error: %s *\n",
	156	asm_error_str (asm_err));
	157	rcode = 1;
	158	}
	159	} else {
	160	break;
	161	}
	162	}
	163	return rcode;
	164	} /* do_bedbug_asm */
	165
	166	U_BOOT_CMD (as, 2, 0, do_bedbug_asm,
	167	"as - assemble memory\n", "as <address>\n");
47d1a6e1 WD	168	\f
	169	/* ======================================================================
	170	* Used to set a break point from the interpreter. Simply calls into the
	171	* CPU-specific break point set routine.
	172	* ====================================================================== */
	173
d87080b7	174	int do_bedbug_break (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	175	{
d87080b7 WD	176	/* -------------------------------------------------- */
	177	if (bug_ctx.do_break)
	178	(*bug_ctx.do_break) (cmdtp, flag, argc, argv);
	179	return 0;
	180
	181	} /* do_bedbug_break */
	182
	183	U_BOOT_CMD (break, 3, 0, do_bedbug_break,
	184	"break - set or clear a breakpoint\n",
	185	" - Set or clear a breakpoint\n"
	186	"break <address> - Break at an address\n"
	187	"break off <bp#> - Disable breakpoint.\n"
	188	"break show - List breakpoints.\n");
47d1a6e1 WD	189	\f
	190	/* ======================================================================
	191	* Called from the debug interrupt routine. Simply calls the CPU-specific
	192	* breakpoint handling routine.
	193	* ====================================================================== */
	194
	195	void do_bedbug_breakpoint (struct pt_regs *regs)
	196	{
d87080b7	197	/* -------------------------------------------------- */
47d1a6e1	198
d87080b7 WD	199	if (bug_ctx.break_isr)
d87080b7 WD	200	(*bug_ctx.break_isr) (regs);
47d1a6e1	201
d87080b7 WD	202	return;
	203	} /* do_bedbug_breakpoint */
	204	\f
47d1a6e1 WD	205
47d1a6e1 WD	206
47d1a6e1 WD	207	/* ======================================================================
	208	* Called from the CPU-specific breakpoint handling routine. Enter a
	209	* mini main loop until the stopped flag is cleared from the breakpoint
	210	* context.
	211	*
	212	* This handles the parts of the debugger that are common to all CPU's.
	213	* ====================================================================== */
	214
d87080b7	215	void bedbug_main_loop (unsigned long addr, struct pt_regs *regs)
47d1a6e1	216	{
d87080b7 WD	217	int len; /* Length of command line */
	218	int flag; /* Command flags */
	219	int rc = 0; /* Result from run_command */
	220	char prompt_str[20]; /* Prompt string */
	221	static char lastcommand[CFG_CBSIZE] = { 0 }; /* previous command */
	222	/* -------------------------------------------------- */
47d1a6e1	223
d87080b7 WD	224	if (bug_ctx.clear)
d87080b7 WD	225	(*bug_ctx.clear) (bug_ctx.current_bp);
47d1a6e1	226
d87080b7 WD	227	printf ("Breakpoint %d: ", bug_ctx.current_bp);
d87080b7 WD	228	disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);
47d1a6e1	229
d87080b7 WD	230	bug_ctx.stopped = 1;
d87080b7 WD	231	bug_ctx.regs = regs;
47d1a6e1	232
d87080b7	233	sprintf (prompt_str, "BEDBUG.%d =>", bug_ctx.current_bp);
47d1a6e1	234
d87080b7 WD	235	/* A miniature main loop */
	236	while (bug_ctx.stopped) {
	237	len = readline (prompt_str);
47d1a6e1	238
d87080b7	239	flag = 0; /* assume no special flags for now */
47d1a6e1	240
d87080b7 WD	241	if (len > 0)
	242	strcpy (lastcommand, console_buffer);
	243	else if (len == 0)
	244	flag \|= CMD_FLAG_REPEAT;
47d1a6e1	245
d87080b7 WD	246	if (len == -1)
	247	printf ("<INTERRUPT>\n");
	248	else
	249	rc = run_command (lastcommand, flag);
47d1a6e1	250
d87080b7 WD	251	if (rc <= 0) {
	252	/* invalid command or not repeatable, forget it */
	253	lastcommand[0] = 0;
	254	}
	255	}
47d1a6e1	256
d87080b7 WD	257	bug_ctx.regs = NULL;
d87080b7 WD	258	bug_ctx.current_bp = 0;
47d1a6e1	259
d87080b7 WD	260	return;
	261	} /* bedbug_main_loop */
	262	\f
47d1a6e1 WD	263
47d1a6e1 WD	264
47d1a6e1 WD	265	/* ======================================================================
	266	* Interpreter command to continue from a breakpoint. Just clears the
	267	* stopped flag in the context so that the breakpoint routine will
	268	* return.
	269	* ====================================================================== */
d87080b7	270	int do_bedbug_continue (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	271	{
d87080b7 WD	272	/* -------------------------------------------------- */
	273
	274	if (!bug_ctx.stopped) {
	275	printf ("Not at a breakpoint\n");
	276	return 1;
	277	}
	278
	279	bug_ctx.stopped = 0;
	280	return 0;
	281	} /* do_bedbug_continue */
	282
	283	U_BOOT_CMD (continue, 1, 0, do_bedbug_continue,
	284	"continue- continue from a breakpoint\n",
	285	" - continue from a breakpoint.\n");
47d1a6e1 WD	286	\f
	287	/* ======================================================================
	288	* Interpreter command to continue to the next instruction, stepping into
	289	* subroutines. Works by calling the find_next_addr() routine to compute
	290	* the address passes control to the CPU-specific set breakpoint routine
	291	* for the current breakpoint number.
	292	* ====================================================================== */
d87080b7	293	int do_bedbug_step (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	294	{
d87080b7 WD	295	unsigned long addr; /* Address to stop at */
	296
	297	/* -------------------------------------------------- */
	298
	299	if (!bug_ctx.stopped) {
	300	printf ("Not at a breakpoint\n");
	301	return 1;
	302	}
	303
	304	if (!find_next_address ((unsigned char *) &addr, FALSE, bug_ctx.regs))
	305	return 1;
	306
	307	if (bug_ctx.set)
	308	(*bug_ctx.set) (bug_ctx.current_bp, addr);
	309
	310	bug_ctx.stopped = 0;
	311	return 0;
	312	} /* do_bedbug_step */
	313
	314	U_BOOT_CMD (step, 1, 1, do_bedbug_step,
	315	"step - single step execution.\n",
	316	" - single step execution.\n");
47d1a6e1 WD	317	\f
	318	/* ======================================================================
	319	* Interpreter command to continue to the next instruction, stepping over
	320	* subroutines. Works by calling the find_next_addr() routine to compute
	321	* the address passes control to the CPU-specific set breakpoint routine
	322	* for the current breakpoint number.
	323	* ====================================================================== */
d87080b7	324	int do_bedbug_next (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	325	{
d87080b7 WD	326	unsigned long addr; /* Address to stop at */
	327
	328	/* -------------------------------------------------- */
	329
	330	if (!bug_ctx.stopped) {
	331	printf ("Not at a breakpoint\n");
	332	return 1;
	333	}
	334
	335	if (!find_next_address ((unsigned char *) &addr, TRUE, bug_ctx.regs))
	336	return 1;
	337
	338	if (bug_ctx.set)
	339	(*bug_ctx.set) (bug_ctx.current_bp, addr);
	340
	341	bug_ctx.stopped = 0;
	342	return 0;
	343	} /* do_bedbug_next */
	344
	345	U_BOOT_CMD (next, 1, 1, do_bedbug_next,
	346	"next - single step execution, stepping over subroutines.\n",
	347	" - single step execution, stepping over subroutines.\n");
47d1a6e1 WD	348	\f
	349	/* ======================================================================
	350	* Interpreter command to print the current stack. This assumes an EABI
	351	* architecture, so it starts with GPR R1 and works back up the stack.
	352	* ====================================================================== */
d87080b7	353	int do_bedbug_stack (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	354	{
d87080b7 WD	355	unsigned long sp; /* Stack pointer */
	356	unsigned long func; /* LR from stack */
	357	int depth; /* Stack iteration level */
	358	int skip = 1; /* Flag to skip the first entry */
	359	unsigned long top; /* Top of memory address */
	360
	361	/* -------------------------------------------------- */
	362
	363	if (!bug_ctx.stopped) {
	364	printf ("Not at a breakpoint\n");
	365	return 1;
	366	}
	367
	368	top = gd->bd->bi_memstart + gd->bd->bi_memsize;
	369	depth = 0;
	370
	371	printf ("Depth PC\n");
	372	printf ("----- --------\n");
	373	printf ("%5d %08lx\n", depth++, bug_ctx.regs->nip);
	374
	375	sp = bug_ctx.regs->gpr[1];
	376	func = (unsigned long ) (sp + 4);
	377
	378	while ((func < top) && (sp < top)) {
	379	if (!skip)
	380	printf ("%5d %08lx\n", depth++, func);
	381	else
	382	--skip;
	383
	384	sp = (unsigned long ) sp;
	385	func = (unsigned long ) (sp + 4);
	386	}
	387	return 0;
	388	} /* do_bedbug_stack */
	389
	390	U_BOOT_CMD (where, 1, 1, do_bedbug_stack,
	391	"where - Print the running stack.\n",
	392	" - Print the running stack.\n");
47d1a6e1 WD	393	\f
	394	/* ======================================================================
	395	* Interpreter command to dump the registers. Calls the CPU-specific
	396	* show registers routine.
	397	* ====================================================================== */
d87080b7	398	int do_bedbug_rdump (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
47d1a6e1	399	{
d87080b7 WD	400	/* -------------------------------------------------- */
	401
	402	if (!bug_ctx.stopped) {
	403	printf ("Not at a breakpoint\n");
	404	return 1;
	405	}
	406
	407	show_regs (bug_ctx.regs);
	408	return 0;
	409	} /* do_bedbug_rdump */
	410
	411	U_BOOT_CMD (rdump, 1, 1, do_bedbug_rdump,
	412	"rdump - Show registers.\n", " - Show registers.\n");
47d1a6e1	413	/* ====================================================================== */
47d1a6e1 WD	414
	415
	416	/*
	417	* Copyright (c) 2001 William L. Pitts
	418	* All rights reserved.
	419	*
	420	* Redistribution and use in source and binary forms are freely
	421	* permitted provided that the above copyright notice and this
	422	* paragraph and the following disclaimer are duplicated in all
	423	* such forms.
	424	*
	425	* This software is provided "AS IS" and without any express or
	426	* implied warranties, including, without limitation, the implied
	427	* warranties of merchantability and fitness for a particular
	428	* purpose.
	429	*/