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https://github.com/brain-hackers/u-boot-brain
synced 2024-08-22 01:48:52 +09:00
![Heiko Schocher](/assets/img/avatar_default.png)
There was for long time no activity in the 4xx area. We need to go further and convert to Kconfig, but it turned out, nobody is interested anymore in 4xx, so remove it. Signed-off-by: Heiko Schocher <hs@denx.de>
405 lines
12 KiB
C
405 lines
12 KiB
C
/*
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* BedBug Functions
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*/
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#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>
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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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DECLARE_GLOBAL_DATA_PTR;
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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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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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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 * const 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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return CMD_RET_USAGE;
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if ((flag & CMD_FLAG_REPEAT) == 0) {
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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 (ds, 3, 1, do_bedbug_dis,
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"disassemble memory",
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"ds <address> [# instructions]");
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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 * const 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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return CMD_RET_USAGE;
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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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putc ('\n');
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disppc ((unsigned char *) mem_addr, 0, 1, bedbug_puts,
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F_RADHEX);
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sprintf (prompt, "%08lx: ", mem_addr);
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cli_readline(prompt);
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if (console_buffer[0] && strcmp (console_buffer, ".")) {
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if ((instr =
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asmppc (mem_addr, console_buffer,
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&asm_err)) != 0) {
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*(unsigned long *) mem_addr = instr;
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mem_addr += 4;
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} else {
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printf ("*** Error: %s ***\n",
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asm_error_str (asm_err));
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rcode = 1;
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}
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} else {
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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 (as, 2, 0, do_bedbug_asm,
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"assemble memory", "as <address>");
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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 * const 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 (break, 3, 0, do_bedbug_break,
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"set or clear a breakpoint",
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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.");
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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[CONFIG_SYS_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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len = cli_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_repeatable(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 * const argv[])
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{
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/* -------------------------------------------------- */
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if (!bug_ctx.stopped) {
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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 (continue, 1, 0, do_bedbug_continue,
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"continue from a breakpoint",
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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 * const 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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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 (step, 1, 1, do_bedbug_step,
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"single step execution.",
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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 * const 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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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 (next, 1, 1, do_bedbug_next,
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"single step execution, stepping over subroutines.",
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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 * const argv[])
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{
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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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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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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 (where, 1, 1, do_bedbug_stack,
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"Print the running stack.",
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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 * const argv[])
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{
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/* -------------------------------------------------- */
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if (!bug_ctx.stopped) {
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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 (rdump, 1, 1, do_bedbug_rdump,
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"Show registers.", "");
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/* ====================================================================== */
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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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