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cmd/bedbug.c
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/* * BedBug Functions */ #include <common.h> |
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#include <cli.h> |
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#include <command.h> |
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#include <console.h> |
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#include <linux/ctype.h> #include <net.h> |
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#include <bedbug/type.h> |
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#include <bedbug/bedbug.h> #include <bedbug/regs.h> #include <bedbug/ppc.h> |
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DECLARE_GLOBAL_DATA_PTR; |
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extern void show_regs __P ((struct pt_regs *)); extern int run_command __P ((const char *, int)); |
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ulong dis_last_addr = 0; /* Last address disassembled */ ulong dis_last_len = 20; /* Default disassembler length */ CPU_DEBUG_CTX bug_ctx; /* Bedbug context structure */ |
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/* ====================================================================== * U-Boot's puts function does not append a newline, so the bedbug stuff * will use this for the output of the dis/assembler. * ====================================================================== */ |
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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 ", str); return 0; } /* bedbug_puts */ |
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/* ====================================================================== * Initialize the bug_ctx structure used by the bedbug debugger. This is * specific to the CPU since each has different debug registers and * settings. * ====================================================================== */ |
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void bedbug_init (void) |
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{ |
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/* -------------------------------------------------- */ |
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return; } /* bedbug_init */ |
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/* ====================================================================== * Entry point from the interpreter to the disassembler. Repeated calls * will resume from the last disassembled address. * ====================================================================== */ |
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int do_bedbug_dis (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[]) |
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{ |
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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; |
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if (argc < 2) |
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return CMD_RET_USAGE; |
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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, |
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"disassemble memory", |
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"ds <address> [# instructions]"); |
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/* ====================================================================== * Entry point from the interpreter to the assembler. Assembles * instructions in consecutive memory locations until a '.' (period) is * entered on a line by itself. * ====================================================================== */ |
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int do_bedbug_asm (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[]) |
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{ |
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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; |
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if (argc < 2) |
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return CMD_RET_USAGE; |
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printf (" Enter '.' when done "); mem_addr = simple_strtoul (argv[1], NULL, 16); while (1) { putc (' '); disppc ((unsigned char *) mem_addr, 0, 1, bedbug_puts, F_RADHEX); sprintf (prompt, "%08lx: ", mem_addr); |
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cli_readline(prompt); |
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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 *** ", asm_error_str (asm_err)); rcode = 1; } } else { break; } } return rcode; } /* do_bedbug_asm */ U_BOOT_CMD (as, 2, 0, do_bedbug_asm, |
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"assemble memory", "as <address>"); |
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/* ====================================================================== * Used to set a break point from the interpreter. Simply calls into the * CPU-specific break point set routine. * ====================================================================== */ |
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int do_bedbug_break (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[]) |
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{ |
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/* -------------------------------------------------- */ 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, |
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"set or clear a breakpoint", |
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" - Set or clear a breakpoint " "break <address> - Break at an address " "break off <bp#> - Disable breakpoint. " |
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"break show - List breakpoints."); |
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/* ====================================================================== * Called from the debug interrupt routine. Simply calls the CPU-specific * breakpoint handling routine. * ====================================================================== */ void do_bedbug_breakpoint (struct pt_regs *regs) { |
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/* -------------------------------------------------- */ |
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if (bug_ctx.break_isr) (*bug_ctx.break_isr) (regs); |
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return; } /* do_bedbug_breakpoint */ |
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/* ====================================================================== * 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. * ====================================================================== */ |
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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 */ int flag; /* Command flags */ int rc = 0; /* Result from run_command */ char prompt_str[20]; /* Prompt string */ |
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static char lastcommand[CONFIG_SYS_CBSIZE] = { 0 }; /* previous command */ |
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/* -------------------------------------------------- */ |
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if (bug_ctx.clear) (*bug_ctx.clear) (bug_ctx.current_bp); |
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printf ("Breakpoint %d: ", bug_ctx.current_bp); disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX); |
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bug_ctx.stopped = 1; 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 */ while (bug_ctx.stopped) { |
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len = cli_readline(prompt_str); |
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flag = 0; /* assume no special flags for now */ |
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if (len > 0) strcpy (lastcommand, console_buffer); else if (len == 0) flag |= CMD_FLAG_REPEAT; |
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if (len == -1) printf ("<INTERRUPT> "); else |
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rc = run_command_repeatable(lastcommand, flag); |
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if (rc <= 0) { /* invalid command or not repeatable, forget it */ lastcommand[0] = 0; } } |
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bug_ctx.regs = NULL; bug_ctx.current_bp = 0; |
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return; } /* bedbug_main_loop */ |
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/* ====================================================================== * Interpreter command to continue from a breakpoint. Just clears the * stopped flag in the context so that the breakpoint routine will * return. * ====================================================================== */ |
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int do_bedbug_continue (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[]) |
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{ |
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/* -------------------------------------------------- */ if (!bug_ctx.stopped) { printf ("Not at a breakpoint "); return 1; } bug_ctx.stopped = 0; return 0; } /* do_bedbug_continue */ U_BOOT_CMD (continue, 1, 0, do_bedbug_continue, |
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"continue from a breakpoint", |
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""); |
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/* ====================================================================== * 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. * ====================================================================== */ |
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int do_bedbug_step (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[]) |
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{ |
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unsigned long addr; /* Address to stop at */ /* -------------------------------------------------- */ if (!bug_ctx.stopped) { printf ("Not at a breakpoint "); return 1; } |
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if (!find_next_address((unsigned char *) &addr, false, bug_ctx.regs)) |
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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, |
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"single step execution.", |
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""); |
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/* ====================================================================== * 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. * ====================================================================== */ |
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int do_bedbug_next (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[]) |
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{ |
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unsigned long addr; /* Address to stop at */ /* -------------------------------------------------- */ if (!bug_ctx.stopped) { printf ("Not at a breakpoint "); return 1; } |
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if (!find_next_address((unsigned char *) &addr, true, bug_ctx.regs)) |
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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, |
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"single step execution, stepping over subroutines.", |
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""); |
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/* ====================================================================== * Interpreter command to print the current stack. This assumes an EABI * architecture, so it starts with GPR R1 and works back up the stack. * ====================================================================== */ |
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int do_bedbug_stack (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[]) |
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{ |
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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 "); return 1; } top = gd->bd->bi_memstart + gd->bd->bi_memsize; depth = 0; printf ("Depth PC "); printf ("----- -------- "); printf ("%5d %08lx ", 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 ", 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, |
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"Print the running stack.", |
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""); |
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/* ====================================================================== * Interpreter command to dump the registers. Calls the CPU-specific * show registers routine. * ====================================================================== */ |
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int do_bedbug_rdump (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[]) |
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{ |
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/* -------------------------------------------------- */ if (!bug_ctx.stopped) { printf ("Not at a breakpoint "); return 1; } show_regs (bug_ctx.regs); return 0; } /* do_bedbug_rdump */ U_BOOT_CMD (rdump, 1, 1, do_bedbug_rdump, |
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"Show registers.", ""); |
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/* ====================================================================== */ |
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/* * 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. */ |