/*      $NetBSD: db_examine.c,v 1.40 2019/09/12 09:20:23 ryo Exp $      */

/*
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 *
 *      Author: David B. Golub, Carnegie Mellon University
 *      Date:   7/90
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: db_examine.c,v 1.40 2019/09/12 09:20:23 ryo Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/proc.h>

#include <ddb/ddb.h>

static char     db_examine_format[TOK_STRING_SIZE] = "x";

static void     db_examine(db_addr_t, char *, int);
static void     db_search(db_addr_t, int, db_expr_t, db_expr_t, unsigned int);

/*
 * Examine (print) data.  Syntax is:
 *              x/[bhl][cdiorsuxz]*
 * For example, the command:
 *      x/bxxxx
 * should print:
 *      address:  01  23  45  67
 */
/*ARGSUSED*/
void
db_examine_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
    const char *modif)
{
        if (modif[0] != '\0')
                strlcpy(db_examine_format, modif, sizeof(db_examine_format));

        if (count == -1)
                count = 1;

        db_examine((db_addr_t) addr, db_examine_format, count);
}

static void
db_examine(db_addr_t addr, char *fmt, int count)
{
        int             i, c;
        quad_t          value;
        int             size;
        int             width;
        int             bytes;
        char *          fp;
        char            tbuf[24];

        while (--count >= 0) {
                fp = fmt;
                size = 4;
                width = 12;
                while ((c = *fp++) != 0) {
                        if (db_print_position() == 0) {
                                /* Always print the address. */
                                db_printsym(addr, DB_STGY_ANY, db_printf);
                                db_printf(":\t");
                                db_prev = addr;
                        }
                        switch (c) {
                        case 'b':       /* byte */
                                size = 1;
                                width = 4;
                                break;
                        case 'h':       /* half-word */
                                size = 2;
                                width = 8;
                                break;
                        case 'l':       /* long-word */
                                size = 4;
                                width = 12;
                                break;
                        case 'q':       /* quad-word */
                                size = 8;
                                width = 24;
                                break;
                        case 'L':       /* implementation maximum */
                                size = sizeof value;
                                width = 12 * (sizeof value / 4);
                                break;
                        case 'a':       /* address */
                                db_printf("= 0x%lx\n", (long)addr);
                                break;
                        case 'p':
                                size = sizeof(void *);
                                value = db_get_value(addr, size, false);
                                addr += size;
                                db_printf("= 0x%lx ", (long)value);
                                db_printsym((db_addr_t)value, DB_STGY_ANY, db_printf);
                                db_printf("\n");
                                break;
                        case 'r':       /* signed, current radix */
                                value = db_get_qvalue(addr, size, true);
                                addr += size;
                                db_format_radix(tbuf, 24, value, false);
                                db_printf("%-*s", width, tbuf);
                                break;
                        case 'x':       /* unsigned hex */
                                value = db_get_qvalue(addr, size, false);
                                addr += size;
                                db_printf("%-*" PRIx64, width, value);
                                break;
                        case 'm':       /* hex dump */
                                /*
                                 * Print off in chunks of size. Try to print 16
                                 * bytes at a time into 16/size columns. This
                                 * loops modify's count extra times in order
                                 * to get the nicely formatted lines.
                                 */

                                bytes = 0;
                                do {
                                        for (i = 0; i < size; i++) {
                                                value =
#if BYTE_ORDER == LITTLE_ENDIAN
                                                    db_get_value(addr +
                                                    (bytes & ~(size - 1)) +
                                                    size - i - 1, 1, false);
#else
                                                    db_get_value(addr + bytes,
                                                    1, false);
#endif
                                                db_printf(
                                                    "%02" PRIx64,
                                                    value);
                                                bytes++;
                                                if (!(bytes % size))
                                                        db_printf(" ");
                                        }
                                } while ((bytes != 16) && count--);
                                /* True up the columns before continuing */
                                for (i = 4; i >= (bytes / 4); i--)
                                        db_printf ("\t");
                                /* Print chars,  use . for non-printable's. */
                                while (bytes--) {
                                        value = db_get_value(addr, 1, false);
                                        addr += 1;
                                        if (value >= ' ' && value <= '~')
                                                db_printf("%c", (char)value);
                                        else
                                                db_printf(".");
                                }
                                db_printf("\n");
                                break;
                        case 'z':       /* signed hex */
                                value = db_get_qvalue(addr, size, true);
                                addr += size;
                                db_format_hex(tbuf, 24, value, false);
                                db_printf("%-*s", width, tbuf);
                                break;
                        case 'd':       /* signed decimal */
                                value = db_get_qvalue(addr, size, true);
                                addr += size;
                                db_printf("%-*" PRId64, width, value);
                                break;
                        case 'u':       /* unsigned decimal */
                                value = db_get_qvalue(addr, size, false);
                                addr += size;
                                db_printf("%-*" PRIu64, width, value);
                                break;
                        case 'o':       /* unsigned octal */
                                value = db_get_qvalue(addr, size, false);
                                addr += size;
                                db_printf("%-*" PRIo64, width, value);
                                break;
                        case 'c':       /* character */
                                value = db_get_value(addr, 1, false);
                                addr += 1;
                                if (value >= ' ' && value <= '~')
                                        db_printf("%c", (char)value);
                                else
                                        db_printf("\\%03o", (int)value);
                                break;
                        case 's':       /* null-terminated string */
                                for (;;) {
                                        value = db_get_value(addr, 1, false);
                                        addr += 1;
                                        if (value == 0)
                                                break;
                                        if (value >= ' ' && value <= '~')
                                                db_printf("%c", (char)value);
                                        else
                                                db_printf("\\%03o", (int)value);
                                }
                                break;
                        case 'i':       /* instruction */
                                addr = db_disasm(addr, false);
                                break;
                        case 'I':       /* instruction, alternate form */
                                addr = db_disasm(addr, true);
                                break;
                        default:
                                break;
                        }
                        if (db_print_position() != 0)
                                db_end_line();
                }
        }
        db_next = addr;
}

/*
 * Print value.
 */
static char     db_print_format = 'x';

/*ARGSUSED*/
void
db_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
    const char *modif)
{
        db_expr_t       value;

        if (modif[0] != '\0')
                db_print_format = modif[0];

        switch (db_print_format) {
        case 'a':
                db_printsym((db_addr_t)addr, DB_STGY_ANY, db_printf);
                break;
        case 'r':
                {
                        char tbuf[24];

                        db_format_radix(tbuf, 24, addr, false);
                        db_printf("%11s", tbuf);
                        break;
                }
        case 'x':
                db_printf("%16" DDB_EXPR_FMT "x", addr);
                break;
        case 'z':
                {
                        char tbuf[24];

                        db_format_hex(tbuf, 24, addr, false);
                        db_printf("%8s", tbuf);
                        break;
                }
        case 'd':
                db_printf("%11" DDB_EXPR_FMT "d", addr);
                break;
        case 'u':
                db_printf("%11" DDB_EXPR_FMT "u", addr);
                break;
        case 'o':
                db_printf("%15" DDB_EXPR_FMT "o", addr);
                break;
        case 'c':
                value = addr & 0xFF;
                if (value >= ' ' && value <= '~')
                        db_printf("%c", (char)value);
                else
                        db_printf("\\%03o", (int)value);
                break;
        }
        db_printf("\n");
}

void
db_print_loc_and_inst(db_addr_t loc)
{

        db_printsym(loc, DB_STGY_PROC, db_printf);
        db_printf(":\t");
        (void) db_disasm(loc, false);
}

/*
 * Search for a value in memory.
 * Syntax: search [/bhl] addr value [mask] [,count]
 */
/*ARGSUSED*/
void
db_search_cmd(db_expr_t daddr, bool have_addr,
    db_expr_t dcount, const char *modif)
{
        int             t;
        db_addr_t       addr;
        int             size;
        db_expr_t       value;
        db_expr_t       mask;
        db_expr_t       count;

        t = db_read_token();
        if (t == tSLASH) {
                t = db_read_token();
                if (t != tIDENT) {
                        bad_modifier:
                        db_printf("Bad modifier\n");
                        db_flush_lex();
                        return;
                }

                if (!strcmp(db_tok_string, "b"))
                        size = 1;
                else if (!strcmp(db_tok_string, "h"))
                        size = 2;
                else if (!strcmp(db_tok_string, "l"))
                        size = 4;
                else
                        goto bad_modifier;
        } else {
                db_unread_token(t);
                size = 4;
        }

        if (!db_expression(&value)) {
                db_printf("Address missing\n");
                db_flush_lex();
                return;
        }
        addr = (db_addr_t) value;

        if (!db_expression(&value)) {
                db_printf("Value missing\n");
                db_flush_lex();
                return;
        }

        if (!db_expression(&mask))
                mask = (int) ~0;

        t = db_read_token();
        if (t == tCOMMA) {
                if (!db_expression(&count)) {
                        db_printf("Count missing\n");
                        db_flush_lex();
                        return;
                }
        } else {
                db_unread_token(t);
                count = -1;             /* effectively forever */
        }
        db_skip_to_eol();

        db_search(addr, size, value, mask, count);
}

static void
db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask,
    unsigned int count)
{
        while (count-- != 0) {
                db_prev = addr;
                if ((db_get_value(addr, size, false) & mask) == value)
                        break;
                addr += size;
        }
        db_next = addr;
}