File: [local] / sys / ddb / db_examine.c (download)
Revision 1.1, Tue Mar 4 16:09:33 2008 UTC (16 years, 6 months ago) by nbrk
Branch point for: MAIN
Initial revision
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/* $OpenBSD: db_examine.c,v 1.13 2007/03/15 17:10:22 miod Exp $ */
/* $NetBSD: db_examine.c,v 1.11 1996/03/30 22:30:07 christos Exp $ */
/*
* Mach Operating System
* Copyright (c) 1993,1992,1991,1990 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 Mellon
* the rights to redistribute these changes.
*
* Author: David B. Golub, Carnegie Mellon University
* Date: 7/90
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <uvm/uvm_extern.h>
#include <machine/db_machdep.h> /* type definitions */
#include <ddb/db_lex.h>
#include <ddb/db_output.h>
#include <ddb/db_command.h>
#include <ddb/db_sym.h>
#include <ddb/db_access.h>
#include <ddb/db_extern.h>
#include <ddb/db_interface.h>
char db_examine_format[TOK_STRING_SIZE] = "x";
/*
* Examine (print) data. Syntax is:
* x/[bhlq][cdiorsuxz]*
* For example, the command:
* x/bxxxx
* should print:
* address: 01 23 45 67
*/
/*ARGSUSED*/
void
db_examine_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
if (modif[0] != '\0')
db_strlcpy(db_examine_format, modif, sizeof(db_examine_format));
if (count == -1)
count = 1;
db_examine((db_addr_t)addr, db_examine_format, count);
}
void
db_examine(db_addr_t addr, char *fmt, int count)
{
int c;
db_expr_t value;
int size;
int width;
char * fp;
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;
#ifdef __LP64__
case 'q': /* quad-word */
size = 8;
width = 20;
break;
#endif
case 'a': /* address */
db_printf("= 0x%lx\n", (long)addr);
break;
case 'r': /* signed, current radix */
value = db_get_value(addr, size, TRUE);
addr += size;
db_printf("%-*lr", width, (long)value);
break;
case 'x': /* unsigned hex */
value = db_get_value(addr, size, FALSE);
addr += size;
db_printf("%-*lx", width, (long)value);
break;
case 'z': /* signed hex */
value = db_get_value(addr, size, TRUE);
addr += size;
db_printf("%-*lz", width, (long)value);
break;
case 'd': /* signed decimal */
value = db_get_value(addr, size, TRUE);
addr += size;
db_printf("%-*ld", width, (long)value);
break;
case 'u': /* unsigned decimal */
value = db_get_value(addr, size, FALSE);
addr += size;
db_printf("%-*lu", width, (long)value);
break;
case 'o': /* unsigned octal */
value = db_get_value(addr, size, FALSE);
addr += size;
db_printf("%-*lo", width, value);
break;
case 'c': /* character */
value = db_get_value(addr, 1, FALSE);
addr += 1;
if (value >= ' ' && value <= '~')
db_printf("%c", value);
else
db_printf("\\%03o", 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", value);
else
db_printf("\\%03o", 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(width);
}
}
db_next = addr;
}
/*
* Print value.
*/
char db_print_format = 'x';
/*ARGSUSED*/
void
db_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, 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':
db_printf("%*r", sizeof(db_expr_t) * 2 * 6 / 5, addr);
break;
case 'x':
db_printf("%*x", sizeof(db_expr_t) * 2, addr);
break;
case 'z':
db_printf("%*z", sizeof(db_expr_t) * 2, addr);
break;
case 'd':
db_printf("%*d", sizeof(db_expr_t) * 2 * 6 / 5, addr);
break;
case 'u':
db_printf("%*u", sizeof(db_expr_t) * 2 * 6 / 5, addr);
break;
case 'o':
db_printf("%*o", sizeof(db_expr_t) * 2 * 4 / 3, addr);
break;
case 'c':
value = addr & 0xFF;
if (value >= ' ' && value <= '~')
db_printf("%c", value);
else
db_printf("\\%03o", 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);
}
/* local copy is needed here so that we can trace strlcpy() in libkern */
size_t
db_strlcpy(char *dst, const char *src, size_t siz)
{
char *d = dst;
const char *s = src;
size_t n = siz;
/* Copy as many bytes as will fit */
if (n != 0 && --n != 0) {
do {
if ((*d++ = *s++) == 0)
break;
} while (--n != 0);
}
/* Not enough room in dst, add NUL and traverse rest of src */
if (n == 0) {
if (siz != 0)
*d = '\0'; /* NUL-terminate dst */
while (*s++)
;
}
return(s - src - 1); /* count does not include NUL */
}
/*
* Search for a value in memory.
* Syntax: search [/bhl] addr value [mask] [,count]
*/
/*ARGSUSED*/
void
db_search_cmd(db_expr_t daddr, int have_addr, db_expr_t dcount, 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; /* forever */
}
db_skip_to_eol();
db_search(addr, size, value, mask, count);
}
void
db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask,
db_expr_t count)
{
/* Negative counts means forever. */
while (count < 0 || count-- != 0) {
db_prev = addr;
if ((db_get_value(addr, size, FALSE) & mask) == value)
break;
addr += size;
}
db_next = addr;
}