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u-boot/common/cmd_bedbug.c

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/*
* 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;
#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
#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 */
/* ======================================================================
* 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 */
/* ======================================================================
* 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 */
/* ======================================================================
* 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");
/* ======================================================================
* 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");
/* ======================================================================
* 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");
/* ======================================================================
* 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 */
/* ======================================================================
* 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 */
/* ======================================================================
* 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");
/* ======================================================================
* 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");
/* ======================================================================
* 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");
/* ======================================================================
* 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");
/* ======================================================================
* 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");
/* ====================================================================== */
#endif /* CFG_CMD_BEDBUG */
/*
* 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.
*/
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