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git.ipfire.org Git - people/ms/u-boot.git/blob - cmd/bedbug.c
9 #include <linux/ctype.h>
11 #include <bedbug/type.h>
12 #include <bedbug/bedbug.h>
13 #include <bedbug/regs.h>
14 #include <bedbug/ppc.h>
16 DECLARE_GLOBAL_DATA_PTR
;
18 extern void show_regs
__P ((struct pt_regs
*));
19 extern int run_command
__P ((const char *, int));
21 ulong dis_last_addr
= 0; /* Last address disassembled */
22 ulong dis_last_len
= 20; /* Default disassembler length */
23 CPU_DEBUG_CTX bug_ctx
; /* Bedbug context structure */
26 /* ======================================================================
27 * U-Boot's puts function does not append a newline, so the bedbug stuff
28 * will use this for the output of the dis/assembler.
29 * ====================================================================== */
31 int bedbug_puts (const char *str
)
33 /* -------------------------------------------------- */
35 printf ("%s\r\n", str
);
41 /* ======================================================================
42 * Initialize the bug_ctx structure used by the bedbug debugger. This is
43 * specific to the CPU since each has different debug registers and
45 * ====================================================================== */
47 void bedbug_init (void)
49 /* -------------------------------------------------- */
51 #if defined(CONFIG_4xx)
52 void bedbug405_init (void);
55 #elif defined(CONFIG_8xx)
56 void bedbug860_init (void);
61 #if defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260)
62 /* Processors that are 603e core based */
63 void bedbug603e_init (void);
73 /* ======================================================================
74 * Entry point from the interpreter to the disassembler. Repeated calls
75 * will resume from the last disassembled address.
76 * ====================================================================== */
77 int do_bedbug_dis (cmd_tbl_t
* cmdtp
, int flag
, int argc
, char * const argv
[])
79 ulong addr
; /* Address to start disassembly from */
80 ulong len
; /* # of instructions to disassemble */
82 /* -------------------------------------------------- */
84 /* Setup to go from the last address if none is given */
91 if ((flag
& CMD_FLAG_REPEAT
) == 0) {
93 addr
= simple_strtoul (argv
[1], NULL
, 16);
95 /* If an extra param is given then it is the length */
97 len
= simple_strtoul (argv
[2], NULL
, 16);
100 /* Run the disassembler */
101 disppc ((unsigned char *) addr
, 0, len
, bedbug_puts
, F_RADHEX
);
103 dis_last_addr
= addr
+ (len
* 4);
106 } /* do_bedbug_dis */
108 U_BOOT_CMD (ds
, 3, 1, do_bedbug_dis
,
109 "disassemble memory",
110 "ds <address> [# instructions]");
112 /* ======================================================================
113 * Entry point from the interpreter to the assembler. Assembles
114 * instructions in consecutive memory locations until a '.' (period) is
115 * entered on a line by itself.
116 * ====================================================================== */
117 int do_bedbug_asm (cmd_tbl_t
* cmdtp
, int flag
, int argc
, char * const argv
[])
119 long mem_addr
; /* Address to assemble into */
120 unsigned long instr
; /* Machine code for text */
121 char prompt
[15]; /* Prompt string for user input */
122 int asm_err
; /* Error code from the assembler */
124 /* -------------------------------------------------- */
128 return CMD_RET_USAGE
;
130 printf ("\nEnter '.' when done\n");
131 mem_addr
= simple_strtoul (argv
[1], NULL
, 16);
135 disppc ((unsigned char *) mem_addr
, 0, 1, bedbug_puts
,
138 sprintf (prompt
, "%08lx: ", mem_addr
);
139 cli_readline(prompt
);
141 if (console_buffer
[0] && strcmp (console_buffer
, ".")) {
143 asmppc (mem_addr
, console_buffer
,
145 *(unsigned long *) mem_addr
= instr
;
148 printf ("*** Error: %s ***\n",
149 asm_error_str (asm_err
));
157 } /* do_bedbug_asm */
159 U_BOOT_CMD (as
, 2, 0, do_bedbug_asm
,
160 "assemble memory", "as <address>");
162 /* ======================================================================
163 * Used to set a break point from the interpreter. Simply calls into the
164 * CPU-specific break point set routine.
165 * ====================================================================== */
167 int do_bedbug_break (cmd_tbl_t
* cmdtp
, int flag
, int argc
, char * const argv
[])
169 /* -------------------------------------------------- */
170 if (bug_ctx
.do_break
)
171 (*bug_ctx
.do_break
) (cmdtp
, flag
, argc
, argv
);
174 } /* do_bedbug_break */
176 U_BOOT_CMD (break, 3, 0, do_bedbug_break
,
177 "set or clear a breakpoint",
178 " - Set or clear a breakpoint\n"
179 "break <address> - Break at an address\n"
180 "break off <bp#> - Disable breakpoint.\n"
181 "break show - List breakpoints.");
183 /* ======================================================================
184 * Called from the debug interrupt routine. Simply calls the CPU-specific
185 * breakpoint handling routine.
186 * ====================================================================== */
188 void do_bedbug_breakpoint (struct pt_regs
*regs
)
190 /* -------------------------------------------------- */
192 if (bug_ctx
.break_isr
)
193 (*bug_ctx
.break_isr
) (regs
);
196 } /* do_bedbug_breakpoint */
200 /* ======================================================================
201 * Called from the CPU-specific breakpoint handling routine. Enter a
202 * mini main loop until the stopped flag is cleared from the breakpoint
205 * This handles the parts of the debugger that are common to all CPU's.
206 * ====================================================================== */
208 void bedbug_main_loop (unsigned long addr
, struct pt_regs
*regs
)
210 int len
; /* Length of command line */
211 int flag
; /* Command flags */
212 int rc
= 0; /* Result from run_command */
213 char prompt_str
[20]; /* Prompt string */
214 static char lastcommand
[CONFIG_SYS_CBSIZE
] = { 0 }; /* previous command */
215 /* -------------------------------------------------- */
218 (*bug_ctx
.clear
) (bug_ctx
.current_bp
);
220 printf ("Breakpoint %d: ", bug_ctx
.current_bp
);
221 disppc ((unsigned char *) addr
, 0, 1, bedbug_puts
, F_RADHEX
);
226 sprintf (prompt_str
, "BEDBUG.%d =>", bug_ctx
.current_bp
);
228 /* A miniature main loop */
229 while (bug_ctx
.stopped
) {
230 len
= cli_readline(prompt_str
);
232 flag
= 0; /* assume no special flags for now */
235 strcpy (lastcommand
, console_buffer
);
237 flag
|= CMD_FLAG_REPEAT
;
240 printf ("<INTERRUPT>\n");
242 rc
= run_command_repeatable(lastcommand
, flag
);
245 /* invalid command or not repeatable, forget it */
251 bug_ctx
.current_bp
= 0;
254 } /* bedbug_main_loop */
258 /* ======================================================================
259 * Interpreter command to continue from a breakpoint. Just clears the
260 * stopped flag in the context so that the breakpoint routine will
262 * ====================================================================== */
263 int do_bedbug_continue (cmd_tbl_t
* cmdtp
, int flag
, int argc
, char * const argv
[])
265 /* -------------------------------------------------- */
267 if (!bug_ctx
.stopped
) {
268 printf ("Not at a breakpoint\n");
274 } /* do_bedbug_continue */
276 U_BOOT_CMD (continue, 1, 0, do_bedbug_continue
,
277 "continue from a breakpoint",
280 /* ======================================================================
281 * Interpreter command to continue to the next instruction, stepping into
282 * subroutines. Works by calling the find_next_addr() routine to compute
283 * the address passes control to the CPU-specific set breakpoint routine
284 * for the current breakpoint number.
285 * ====================================================================== */
286 int do_bedbug_step (cmd_tbl_t
* cmdtp
, int flag
, int argc
, char * const argv
[])
288 unsigned long addr
; /* Address to stop at */
290 /* -------------------------------------------------- */
292 if (!bug_ctx
.stopped
) {
293 printf ("Not at a breakpoint\n");
297 if (!find_next_address((unsigned char *) &addr
, false, bug_ctx
.regs
))
301 (*bug_ctx
.set
) (bug_ctx
.current_bp
, addr
);
305 } /* do_bedbug_step */
307 U_BOOT_CMD (step
, 1, 1, do_bedbug_step
,
308 "single step execution.",
311 /* ======================================================================
312 * Interpreter command to continue to the next instruction, stepping over
313 * subroutines. Works by calling the find_next_addr() routine to compute
314 * the address passes control to the CPU-specific set breakpoint routine
315 * for the current breakpoint number.
316 * ====================================================================== */
317 int do_bedbug_next (cmd_tbl_t
* cmdtp
, int flag
, int argc
, char * const argv
[])
319 unsigned long addr
; /* Address to stop at */
321 /* -------------------------------------------------- */
323 if (!bug_ctx
.stopped
) {
324 printf ("Not at a breakpoint\n");
328 if (!find_next_address((unsigned char *) &addr
, true, bug_ctx
.regs
))
332 (*bug_ctx
.set
) (bug_ctx
.current_bp
, addr
);
336 } /* do_bedbug_next */
338 U_BOOT_CMD (next
, 1, 1, do_bedbug_next
,
339 "single step execution, stepping over subroutines.",
342 /* ======================================================================
343 * Interpreter command to print the current stack. This assumes an EABI
344 * architecture, so it starts with GPR R1 and works back up the stack.
345 * ====================================================================== */
346 int do_bedbug_stack (cmd_tbl_t
* cmdtp
, int flag
, int argc
, char * const argv
[])
348 unsigned long sp
; /* Stack pointer */
349 unsigned long func
; /* LR from stack */
350 int depth
; /* Stack iteration level */
351 int skip
= 1; /* Flag to skip the first entry */
352 unsigned long top
; /* Top of memory address */
354 /* -------------------------------------------------- */
356 if (!bug_ctx
.stopped
) {
357 printf ("Not at a breakpoint\n");
361 top
= gd
->bd
->bi_memstart
+ gd
->bd
->bi_memsize
;
364 printf ("Depth PC\n");
365 printf ("----- --------\n");
366 printf ("%5d %08lx\n", depth
++, bug_ctx
.regs
->nip
);
368 sp
= bug_ctx
.regs
->gpr
[1];
369 func
= *(unsigned long *) (sp
+ 4);
371 while ((func
< top
) && (sp
< top
)) {
373 printf ("%5d %08lx\n", depth
++, func
);
377 sp
= *(unsigned long *) sp
;
378 func
= *(unsigned long *) (sp
+ 4);
381 } /* do_bedbug_stack */
383 U_BOOT_CMD (where
, 1, 1, do_bedbug_stack
,
384 "Print the running stack.",
387 /* ======================================================================
388 * Interpreter command to dump the registers. Calls the CPU-specific
389 * show registers routine.
390 * ====================================================================== */
391 int do_bedbug_rdump (cmd_tbl_t
* cmdtp
, int flag
, int argc
, char * const argv
[])
393 /* -------------------------------------------------- */
395 if (!bug_ctx
.stopped
) {
396 printf ("Not at a breakpoint\n");
400 show_regs (bug_ctx
.regs
);
402 } /* do_bedbug_rdump */
404 U_BOOT_CMD (rdump
, 1, 1, do_bedbug_rdump
,
405 "Show registers.", "");
406 /* ====================================================================== */
410 * Copyright (c) 2001 William L. Pitts
411 * All rights reserved.
413 * Redistribution and use in source and binary forms are freely
414 * permitted provided that the above copyright notice and this
415 * paragraph and the following disclaimer are duplicated in all
418 * This software is provided "AS IS" and without any express or
419 * implied warranties, including, without limitation, the implied
420 * warranties of merchantability and fitness for a particular