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u-boot/common/cmd_bedbug.c

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Initial revision
2002-11-03 08:01:44 +08:00
/*
* BedBug Functions
*/
#include <common.h>
#include <command.h>
#include <linux/ctype.h>
#include <net.h>
#include <cmd_bedbug.h>
#include <bedbug/bedbug.h>
#include <bedbug/regs.h>
#include <bedbug/ppc.h>
#include <elf.h>
#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_MPC860)
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 */
/* ======================================================================
* 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 */
/* ======================================================================
* 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 */
/* ======================================================================
* 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 */
/* ======================================================================
* 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 */
/* ======================================================================
* 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 */
/* ======================================================================
* 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[])
{
DECLARE_GLOBAL_DATA_PTR;
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 */
/* ======================================================================
* 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 */
/* ====================================================================== */
#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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