450 lines
13 KiB
C
450 lines
13 KiB
C
/*
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* BedBug Functions
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*/
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#include <common.h>
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#include <command.h>
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#include <linux/ctype.h>
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#include <net.h>
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#include <bedbug/type.h>
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#include <bedbug/bedbug.h>
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#include <bedbug/regs.h>
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#include <bedbug/ppc.h>
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#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
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#ifndef MAX
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#define MAX(a,b) ((a) > (b) ? (a) : (b))
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#endif
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extern void show_regs __P((struct pt_regs*));
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extern int run_command __P((const char*, int));
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extern char console_buffer[];
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ulong dis_last_addr = 0; /* Last address disassembled */
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ulong dis_last_len = 20; /* Default disassembler length */
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CPU_DEBUG_CTX bug_ctx; /* Bedbug context structure */
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/* ======================================================================
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* U-Boot's puts function does not append a newline, so the bedbug stuff
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* will use this for the output of the dis/assembler.
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* ====================================================================== */
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int bedbug_puts(const char *str)
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{
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/* -------------------------------------------------- */
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printf( "%s\r\n", str );
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return 0;
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} /* bedbug_puts */
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/* ======================================================================
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* Initialize the bug_ctx structure used by the bedbug debugger. This is
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* specific to the CPU since each has different debug registers and
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* settings.
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* ====================================================================== */
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void bedbug_init( void )
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{
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/* -------------------------------------------------- */
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#if defined(CONFIG_4xx)
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void bedbug405_init( void );
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bedbug405_init();
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#elif defined(CONFIG_8xx)
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void bedbug860_init( void );
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bedbug860_init();
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#endif
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#if defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260)
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/* Processors that are 603e core based */
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void bedbug603e_init( void );
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bedbug603e_init();
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#endif
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return;
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} /* bedbug_init */
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/* ======================================================================
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* Entry point from the interpreter to the disassembler. Repeated calls
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* will resume from the last disassembled address.
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* ====================================================================== */
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int do_bedbug_dis (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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ulong addr; /* Address to start disassembly from */
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ulong len; /* # of instructions to disassemble */
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/* -------------------------------------------------- */
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/* Setup to go from the last address if none is given */
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addr = dis_last_addr;
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len = dis_last_len;
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if (argc < 2)
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{
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printf ("Usage:\n%s\n", cmdtp->usage);
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return 1;
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}
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if(( flag & CMD_FLAG_REPEAT ) == 0 )
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{
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/* New command */
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addr = simple_strtoul( argv[1], NULL, 16 );
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/* If an extra param is given then it is the length */
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if( argc > 2 )
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len = simple_strtoul( argv[2], NULL, 16 );
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}
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/* Run the disassembler */
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disppc( (unsigned char *)addr, 0, len, bedbug_puts, F_RADHEX );
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dis_last_addr = addr + (len * 4);
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dis_last_len = len;
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return 0;
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} /* do_bedbug_dis */
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U_BOOT_CMD(
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ds, 3, 1, do_bedbug_dis,
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"ds - disassemble memory\n",
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"ds <address> [# instructions]\n"
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);
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/* ======================================================================
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* Entry point from the interpreter to the assembler. Assembles
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* instructions in consecutive memory locations until a '.' (period) is
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* entered on a line by itself.
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* ====================================================================== */
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int do_bedbug_asm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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long mem_addr; /* Address to assemble into */
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unsigned long instr; /* Machine code for text */
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char prompt[ 15 ]; /* Prompt string for user input */
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int asm_err; /* Error code from the assembler*/
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/* -------------------------------------------------- */
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int rcode = 0;
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if (argc < 2)
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{
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printf ("Usage:\n%s\n", cmdtp->usage);
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return 1;
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}
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printf( "\nEnter '.' when done\n" );
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mem_addr = simple_strtoul( argv[ 1 ], NULL, 16 );
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while( 1 )
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{
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putc( '\n' );
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disppc( (unsigned char *)mem_addr, 0, 1, bedbug_puts, F_RADHEX );
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sprintf( prompt, "%08lx: ", mem_addr );
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readline( prompt );
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if( console_buffer[ 0 ] && strcmp( console_buffer, "." ))
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{
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if(( instr = asmppc( mem_addr, console_buffer, &asm_err )) != 0 )
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{
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*(unsigned long *)mem_addr = instr;
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mem_addr += 4;
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}
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else
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{
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printf( "*** Error: %s ***\n", asm_error_str( asm_err ));
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rcode = 1;
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}
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}
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else
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{
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break;
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}
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}
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return rcode;
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} /* do_bedbug_asm */
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U_BOOT_CMD(
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as, 2, 0, do_bedbug_asm,
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"as - assemble memory\n",
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"as <address>\n"
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);
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/* ======================================================================
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* Used to set a break point from the interpreter. Simply calls into the
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* CPU-specific break point set routine.
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* ====================================================================== */
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int do_bedbug_break (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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/* -------------------------------------------------- */
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if( bug_ctx.do_break )
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(*bug_ctx.do_break)( cmdtp, flag, argc, argv );
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return 0;
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} /* do_bedbug_break */
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U_BOOT_CMD(
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break, 3, 0, do_bedbug_break,
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"break - set or clear a breakpoint\n",
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" - Set or clear a breakpoint\n"
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"break <address> - Break at an address\n"
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"break off <bp#> - Disable breakpoint.\n"
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"break show - List breakpoints.\n"
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);
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/* ======================================================================
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* Called from the debug interrupt routine. Simply calls the CPU-specific
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* breakpoint handling routine.
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* ====================================================================== */
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void do_bedbug_breakpoint (struct pt_regs *regs)
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{
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/* -------------------------------------------------- */
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if( bug_ctx.break_isr )
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(*bug_ctx.break_isr)( regs );
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return;
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} /* do_bedbug_breakpoint */
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/* ======================================================================
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* Called from the CPU-specific breakpoint handling routine. Enter a
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* mini main loop until the stopped flag is cleared from the breakpoint
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* context.
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*
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* This handles the parts of the debugger that are common to all CPU's.
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* ====================================================================== */
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void bedbug_main_loop( unsigned long addr, struct pt_regs *regs )
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{
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int len; /* Length of command line */
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int flag; /* Command flags */
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int rc = 0; /* Result from run_command*/
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char prompt_str[ 20 ]; /* Prompt string */
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static char lastcommand[ CFG_CBSIZE ] = {0}; /* previous command */
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/* -------------------------------------------------- */
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if( bug_ctx.clear )
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(*bug_ctx.clear)( bug_ctx.current_bp );
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printf( "Breakpoint %d: ", bug_ctx.current_bp );
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disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX );
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bug_ctx.stopped = 1;
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bug_ctx.regs = regs;
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sprintf( prompt_str, "BEDBUG.%d =>", bug_ctx.current_bp );
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/* A miniature main loop */
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while( bug_ctx.stopped )
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{
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len = readline( prompt_str );
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flag = 0; /* assume no special flags for now */
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if (len > 0)
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strcpy( lastcommand, console_buffer );
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else if( len == 0 )
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flag |= CMD_FLAG_REPEAT;
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if (len == -1)
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printf ("<INTERRUPT>\n");
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else
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rc = run_command( lastcommand, flag );
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if (rc <= 0) {
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/* invalid command or not repeatable, forget it */
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lastcommand[0] = 0;
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}
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}
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bug_ctx.regs = NULL;
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bug_ctx.current_bp = 0;
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return;
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} /* bedbug_main_loop */
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/* ======================================================================
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* Interpreter command to continue from a breakpoint. Just clears the
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* stopped flag in the context so that the breakpoint routine will
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* return.
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* ====================================================================== */
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int do_bedbug_continue (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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/* -------------------------------------------------- */
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if( ! bug_ctx.stopped )
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{
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printf( "Not at a breakpoint\n" );
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return 1;
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}
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bug_ctx.stopped = 0;
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return 0;
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} /* do_bedbug_continue */
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U_BOOT_CMD(
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continue, 1, 0, do_bedbug_continue,
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"continue- continue from a breakpoint\n",
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" - continue from a breakpoint.\n"
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);
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/* ======================================================================
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* Interpreter command to continue to the next instruction, stepping into
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* subroutines. Works by calling the find_next_addr() routine to compute
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* the address passes control to the CPU-specific set breakpoint routine
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* for the current breakpoint number.
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* ====================================================================== */
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int do_bedbug_step (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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unsigned long addr; /* Address to stop at */
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/* -------------------------------------------------- */
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if( ! bug_ctx.stopped )
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{
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printf( "Not at a breakpoint\n" );
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return 1;
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}
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if( !find_next_address( (unsigned char *)&addr, FALSE, bug_ctx.regs ))
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return 1;
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if( bug_ctx.set )
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(*bug_ctx.set)( bug_ctx.current_bp, addr );
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bug_ctx.stopped = 0;
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return 0;
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} /* do_bedbug_step */
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U_BOOT_CMD(
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step, 1, 1, do_bedbug_step,
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"step - single step execution.\n",
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" - single step execution.\n"
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);
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/* ======================================================================
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* Interpreter command to continue to the next instruction, stepping over
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* subroutines. Works by calling the find_next_addr() routine to compute
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* the address passes control to the CPU-specific set breakpoint routine
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* for the current breakpoint number.
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* ====================================================================== */
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int do_bedbug_next (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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unsigned long addr; /* Address to stop at */
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/* -------------------------------------------------- */
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if( ! bug_ctx.stopped )
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{
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printf( "Not at a breakpoint\n" );
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return 1;
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}
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if( !find_next_address( (unsigned char *)&addr, TRUE, bug_ctx.regs ))
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return 1;
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if( bug_ctx.set )
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(*bug_ctx.set)( bug_ctx.current_bp, addr );
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bug_ctx.stopped = 0;
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return 0;
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} /* do_bedbug_next */
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U_BOOT_CMD(
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next, 1, 1, do_bedbug_next,
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"next - single step execution, stepping over subroutines.\n",
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" - single step execution, stepping over subroutines.\n"
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);
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/* ======================================================================
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* Interpreter command to print the current stack. This assumes an EABI
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* architecture, so it starts with GPR R1 and works back up the stack.
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* ====================================================================== */
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int do_bedbug_stack (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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DECLARE_GLOBAL_DATA_PTR;
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unsigned long sp; /* Stack pointer */
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unsigned long func; /* LR from stack */
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int depth; /* Stack iteration level */
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int skip = 1; /* Flag to skip the first entry */
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unsigned long top; /* Top of memory address */
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/* -------------------------------------------------- */
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if( ! bug_ctx.stopped )
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{
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printf( "Not at a breakpoint\n" );
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return 1;
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}
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top = gd->bd->bi_memstart + gd->bd->bi_memsize;
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depth = 0;
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printf( "Depth PC\n" );
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printf( "----- --------\n" );
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printf( "%5d %08lx\n", depth++, bug_ctx.regs->nip );
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sp = bug_ctx.regs->gpr[ 1 ];
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func = *(unsigned long *)(sp+4);
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while(( func < top ) && ( sp < top ))
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{
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if( !skip )
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printf( "%5d %08lx\n", depth++, func );
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else
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--skip;
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sp = *(unsigned long *)sp;
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func = *(unsigned long *)(sp+4);
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}
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return 0;
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} /* do_bedbug_stack */
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U_BOOT_CMD(
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where, 1, 1, do_bedbug_stack,
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"where - Print the running stack.\n",
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" - Print the running stack.\n"
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);
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/* ======================================================================
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* Interpreter command to dump the registers. Calls the CPU-specific
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* show registers routine.
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* ====================================================================== */
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int do_bedbug_rdump (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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/* -------------------------------------------------- */
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if( ! bug_ctx.stopped )
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{
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printf( "Not at a breakpoint\n" );
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return 1;
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}
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show_regs( bug_ctx.regs );
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return 0;
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} /* do_bedbug_rdump */
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U_BOOT_CMD(
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rdump, 1, 1, do_bedbug_rdump,
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"rdump - Show registers.\n",
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" - Show registers.\n"
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);
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/* ====================================================================== */
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#endif /* CFG_CMD_BEDBUG */
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/*
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* Copyright (c) 2001 William L. Pitts
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are freely
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* permitted provided that the above copyright notice and this
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* paragraph and the following disclaimer are duplicated in all
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* such forms.
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*
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* This software is provided "AS IS" and without any express or
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* implied warranties, including, without limitation, the implied
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* warranties of merchantability and fitness for a particular
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* purpose.
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*/
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