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 * ====================================================================== */
49 /* -------------------------------------------------- */
55 /* ======================================================================
56 * Entry point from the interpreter to the disassembler. Repeated calls
57 * will resume from the last disassembled address.
58 * ====================================================================== */
59 int do_bedbug_dis(struct cmd_tbl *cmdtp, int flag, int argc,
62 ulong addr; /* Address to start disassembly from */
63 ulong len; /* # of instructions to disassemble */
65 /* -------------------------------------------------- */
67 /* Setup to go from the last address if none is given */
74 if ((flag & CMD_FLAG_REPEAT) == 0) {
76 addr = simple_strtoul (argv[1], NULL, 16);
78 /* If an extra param is given then it is the length */
80 len = simple_strtoul (argv[2], NULL, 16);
83 /* Run the disassembler */
84 disppc ((unsigned char *) addr, 0, len, bedbug_puts, F_RADHEX);
86 dis_last_addr = addr + (len * 4);
91 U_BOOT_CMD (ds, 3, 1, do_bedbug_dis,
93 "ds <address> [# instructions]");
95 /* ======================================================================
96 * Entry point from the interpreter to the assembler. Assembles
97 * instructions in consecutive memory locations until a '.' (period) is
98 * entered on a line by itself.
99 * ====================================================================== */
100 int do_bedbug_asm(struct cmd_tbl *cmdtp, int flag, int argc,
103 long mem_addr; /* Address to assemble into */
104 unsigned long instr; /* Machine code for text */
105 char prompt[15]; /* Prompt string for user input */
106 int asm_err; /* Error code from the assembler */
108 /* -------------------------------------------------- */
112 return CMD_RET_USAGE;
114 printf ("\nEnter '.' when done\n");
115 mem_addr = simple_strtoul (argv[1], NULL, 16);
119 disppc ((unsigned char *) mem_addr, 0, 1, bedbug_puts,
122 sprintf (prompt, "%08lx: ", mem_addr);
123 cli_readline(prompt);
125 if (console_buffer[0] && strcmp (console_buffer, ".")) {
127 asmppc (mem_addr, console_buffer,
129 *(unsigned long *) mem_addr = instr;
132 printf ("*** Error: %s ***\n",
133 asm_error_str (asm_err));
141 } /* do_bedbug_asm */
143 U_BOOT_CMD (as, 2, 0, do_bedbug_asm,
144 "assemble memory", "as <address>");
146 /* ======================================================================
147 * Used to set a break point from the interpreter. Simply calls into the
148 * CPU-specific break point set routine.
149 * ====================================================================== */
151 int do_bedbug_break(struct cmd_tbl *cmdtp, int flag, int argc,
154 /* -------------------------------------------------- */
155 if (bug_ctx.do_break)
156 (*bug_ctx.do_break) (cmdtp, flag, argc, argv);
159 } /* do_bedbug_break */
161 U_BOOT_CMD (break, 3, 0, do_bedbug_break,
162 "set or clear a breakpoint",
163 " - Set or clear a breakpoint\n"
164 "break <address> - Break at an address\n"
165 "break off <bp#> - Disable breakpoint.\n"
166 "break show - List breakpoints.");
168 /* ======================================================================
169 * Called from the debug interrupt routine. Simply calls the CPU-specific
170 * breakpoint handling routine.
171 * ====================================================================== */
173 void do_bedbug_breakpoint (struct pt_regs *regs)
175 /* -------------------------------------------------- */
177 if (bug_ctx.break_isr)
178 (*bug_ctx.break_isr) (regs);
181 } /* do_bedbug_breakpoint */
185 /* ======================================================================
186 * Called from the CPU-specific breakpoint handling routine. Enter a
187 * mini main loop until the stopped flag is cleared from the breakpoint
190 * This handles the parts of the debugger that are common to all CPU's.
191 * ====================================================================== */
193 void bedbug_main_loop (unsigned long addr, struct pt_regs *regs)
195 int len; /* Length of command line */
196 int flag; /* Command flags */
197 int rc = 0; /* Result from run_command */
198 char prompt_str[20]; /* Prompt string */
199 static char lastcommand[CONFIG_SYS_CBSIZE] = { 0 }; /* previous command */
200 /* -------------------------------------------------- */
203 (*bug_ctx.clear) (bug_ctx.current_bp);
205 printf ("Breakpoint %d: ", bug_ctx.current_bp);
206 disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);
211 sprintf (prompt_str, "BEDBUG.%d =>", bug_ctx.current_bp);
213 /* A miniature main loop */
214 while (bug_ctx.stopped) {
215 len = cli_readline(prompt_str);
217 flag = 0; /* assume no special flags for now */
220 strcpy (lastcommand, console_buffer);
222 flag |= CMD_FLAG_REPEAT;
225 printf ("<INTERRUPT>\n");
227 rc = run_command_repeatable(lastcommand, flag);
230 /* invalid command or not repeatable, forget it */
236 bug_ctx.current_bp = 0;
239 } /* bedbug_main_loop */
243 /* ======================================================================
244 * Interpreter command to continue from a breakpoint. Just clears the
245 * stopped flag in the context so that the breakpoint routine will
247 * ====================================================================== */
248 int do_bedbug_continue(struct cmd_tbl *cmdtp, int flag, int argc,
251 /* -------------------------------------------------- */
253 if (!bug_ctx.stopped) {
254 printf ("Not at a breakpoint\n");
260 } /* do_bedbug_continue */
262 U_BOOT_CMD (continue, 1, 0, do_bedbug_continue,
263 "continue from a breakpoint",
266 /* ======================================================================
267 * Interpreter command to continue to the next instruction, stepping into
268 * subroutines. Works by calling the find_next_addr() routine to compute
269 * the address passes control to the CPU-specific set breakpoint routine
270 * for the current breakpoint number.
271 * ====================================================================== */
272 int do_bedbug_step(struct cmd_tbl *cmdtp, int flag, int argc,
275 unsigned long addr; /* Address to stop at */
277 /* -------------------------------------------------- */
279 if (!bug_ctx.stopped) {
280 printf ("Not at a breakpoint\n");
284 if (!find_next_address((unsigned char *) &addr, false, bug_ctx.regs))
288 (*bug_ctx.set) (bug_ctx.current_bp, addr);
292 } /* do_bedbug_step */
294 U_BOOT_CMD (step, 1, 1, do_bedbug_step,
295 "single step execution.",
298 /* ======================================================================
299 * Interpreter command to continue to the next instruction, stepping over
300 * subroutines. Works by calling the find_next_addr() routine to compute
301 * the address passes control to the CPU-specific set breakpoint routine
302 * for the current breakpoint number.
303 * ====================================================================== */
304 int do_bedbug_next(struct cmd_tbl *cmdtp, int flag, int argc,
307 unsigned long addr; /* Address to stop at */
309 /* -------------------------------------------------- */
311 if (!bug_ctx.stopped) {
312 printf ("Not at a breakpoint\n");
316 if (!find_next_address((unsigned char *) &addr, true, bug_ctx.regs))
320 (*bug_ctx.set) (bug_ctx.current_bp, addr);
324 } /* do_bedbug_next */
326 U_BOOT_CMD (next, 1, 1, do_bedbug_next,
327 "single step execution, stepping over subroutines.",
330 /* ======================================================================
331 * Interpreter command to print the current stack. This assumes an EABI
332 * architecture, so it starts with GPR R1 and works back up the stack.
333 * ====================================================================== */
334 int do_bedbug_stack(struct cmd_tbl *cmdtp, int flag, int argc,
337 unsigned long sp; /* Stack pointer */
338 unsigned long func; /* LR from stack */
339 int depth; /* Stack iteration level */
340 int skip = 1; /* Flag to skip the first entry */
341 unsigned long top; /* Top of memory address */
343 /* -------------------------------------------------- */
345 if (!bug_ctx.stopped) {
346 printf ("Not at a breakpoint\n");
350 top = gd->bd->bi_memstart + gd->bd->bi_memsize;
353 printf ("Depth PC\n");
354 printf ("----- --------\n");
355 printf ("%5d %08lx\n", depth++, bug_ctx.regs->nip);
357 sp = bug_ctx.regs->gpr[1];
358 func = *(unsigned long *) (sp + 4);
360 while ((func < top) && (sp < top)) {
362 printf ("%5d %08lx\n", depth++, func);
366 sp = *(unsigned long *) sp;
367 func = *(unsigned long *) (sp + 4);
370 } /* do_bedbug_stack */
372 U_BOOT_CMD (where, 1, 1, do_bedbug_stack,
373 "Print the running stack.",
376 /* ======================================================================
377 * Interpreter command to dump the registers. Calls the CPU-specific
378 * show registers routine.
379 * ====================================================================== */
380 int do_bedbug_rdump(struct cmd_tbl *cmdtp, int flag, int argc,
383 /* -------------------------------------------------- */
385 if (!bug_ctx.stopped) {
386 printf ("Not at a breakpoint\n");
390 show_regs (bug_ctx.regs);
392 } /* do_bedbug_rdump */
394 U_BOOT_CMD (rdump, 1, 1, do_bedbug_rdump,
395 "Show registers.", "");
396 /* ====================================================================== */
400 * Copyright (c) 2001 William L. Pitts
401 * All rights reserved.
403 * Redistribution and use in source and binary forms are freely
404 * permitted provided that the above copyright notice and this
405 * paragraph and the following disclaimer are duplicated in all
408 * This software is provided "AS IS" and without any express or
409 * implied warranties, including, without limitation, the implied
410 * warranties of merchantability and fitness for a particular