/* * BedBug Functions */ #include #include #include #include #include #include #include #include #include #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 ("\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. */