/*
 * BedBug Functions
 */

#include <common.h>
#include <cli.h>
#include <command.h>
#include <console.h>
#include <linux/ctype.h>
#include <net.h>
#include <bedbug/type.h>
#include <bedbug/bedbug.h>
#include <bedbug/regs.h>
#include <bedbug/ppc.h>

DECLARE_GLOBAL_DATA_PTR;

extern void show_regs __P ((struct pt_regs *));
extern int run_command __P ((const char *, int));

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)
{
        /* -------------------------------------------------- */
        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 * const 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)
                return CMD_RET_USAGE;

        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,
            "disassemble memory",
            "ds <address> [# instructions]");

/* ======================================================================
 * 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 * const 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)
                return CMD_RET_USAGE;

        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);
                cli_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 */

U_BOOT_CMD (as, 2, 0, do_bedbug_asm,
            "assemble memory", "as <address>");

/* ======================================================================
 * 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 * const argv[])
{
        /* -------------------------------------------------- */
        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,
            "set or clear a breakpoint",
            " - Set or clear a breakpoint\n"
            "break <address> - Break at an address\n"
            "break off <bp#> - Disable breakpoint.\n"
            "break show      - List breakpoints.");

/* ======================================================================
 * 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[CONFIG_SYS_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 = cli_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_repeatable(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 * const argv[])
{
        /* -------------------------------------------------- */

        if (!bug_ctx.stopped) {
                printf ("Not at a breakpoint\n");
                return 1;
        }

        bug_ctx.stopped = 0;
        return 0;
}                               /* do_bedbug_continue */

U_BOOT_CMD (continue, 1, 0, do_bedbug_continue,
            "continue from a breakpoint",
            "");

/* ======================================================================
 * 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 * const 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 */

U_BOOT_CMD (step, 1, 1, do_bedbug_step,
            "single step execution.",
            "");

/* ======================================================================
 * 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 * const 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 */

U_BOOT_CMD (next, 1, 1, do_bedbug_next,
            "single step execution, stepping over subroutines.",
            "");

/* ======================================================================
 * 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 * const argv[])
{
        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 */

U_BOOT_CMD (where, 1, 1, do_bedbug_stack,
            "Print the running 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 * const argv[])
{
        /* -------------------------------------------------- */

        if (!bug_ctx.stopped) {
                printf ("Not at a breakpoint\n");
                return 1;
        }

        show_regs (bug_ctx.regs);
        return 0;
}                               /* do_bedbug_rdump */

U_BOOT_CMD (rdump, 1, 1, do_bedbug_rdump,
            "Show registers.", "");
/* ====================================================================== */


/*
 * 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.
 */