341 lines
9.0 KiB
C
341 lines
9.0 KiB
C
/* The find command.
|
|
|
|
Copyright (C) 2008-2014 Free Software Foundation, Inc.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "defs.h"
|
|
#include "arch-utils.h"
|
|
#include <ctype.h>
|
|
#include <string.h>
|
|
#include "gdbcmd.h"
|
|
#include "value.h"
|
|
#include "target.h"
|
|
#include "cli/cli-utils.h"
|
|
|
|
/* Copied from bfd_put_bits. */
|
|
|
|
static void
|
|
put_bits (bfd_uint64_t data, gdb_byte *buf, int bits, bfd_boolean big_p)
|
|
{
|
|
int i;
|
|
int bytes;
|
|
|
|
gdb_assert (bits % 8 == 0);
|
|
|
|
bytes = bits / 8;
|
|
for (i = 0; i < bytes; i++)
|
|
{
|
|
int index = big_p ? bytes - i - 1 : i;
|
|
|
|
buf[index] = data & 0xff;
|
|
data >>= 8;
|
|
}
|
|
}
|
|
|
|
/* Subroutine of find_command to simplify it.
|
|
Parse the arguments of the "find" command. */
|
|
|
|
static void
|
|
parse_find_args (char *args, ULONGEST *max_countp,
|
|
gdb_byte **pattern_bufp, ULONGEST *pattern_lenp,
|
|
CORE_ADDR *start_addrp, ULONGEST *search_space_lenp,
|
|
bfd_boolean big_p)
|
|
{
|
|
/* Default to using the specified type. */
|
|
char size = '\0';
|
|
ULONGEST max_count = ~(ULONGEST) 0;
|
|
/* Buffer to hold the search pattern. */
|
|
gdb_byte *pattern_buf;
|
|
/* Current size of search pattern buffer.
|
|
We realloc space as needed. */
|
|
#define INITIAL_PATTERN_BUF_SIZE 100
|
|
ULONGEST pattern_buf_size = INITIAL_PATTERN_BUF_SIZE;
|
|
/* Pointer to one past the last in-use part of pattern_buf. */
|
|
gdb_byte *pattern_buf_end;
|
|
ULONGEST pattern_len;
|
|
CORE_ADDR start_addr;
|
|
ULONGEST search_space_len;
|
|
const char *s = args;
|
|
struct cleanup *old_cleanups;
|
|
struct value *v;
|
|
|
|
if (args == NULL)
|
|
error (_("Missing search parameters."));
|
|
|
|
pattern_buf = xmalloc (pattern_buf_size);
|
|
pattern_buf_end = pattern_buf;
|
|
old_cleanups = make_cleanup (free_current_contents, &pattern_buf);
|
|
|
|
/* Get search granularity and/or max count if specified.
|
|
They may be specified in either order, together or separately. */
|
|
|
|
while (*s == '/')
|
|
{
|
|
++s;
|
|
|
|
while (*s != '\0' && *s != '/' && !isspace (*s))
|
|
{
|
|
if (isdigit (*s))
|
|
{
|
|
max_count = atoi (s);
|
|
while (isdigit (*s))
|
|
++s;
|
|
continue;
|
|
}
|
|
|
|
switch (*s)
|
|
{
|
|
case 'b':
|
|
case 'h':
|
|
case 'w':
|
|
case 'g':
|
|
size = *s++;
|
|
break;
|
|
default:
|
|
error (_("Invalid size granularity."));
|
|
}
|
|
}
|
|
|
|
s = skip_spaces_const (s);
|
|
}
|
|
|
|
/* Get the search range. */
|
|
|
|
v = parse_to_comma_and_eval (&s);
|
|
start_addr = value_as_address (v);
|
|
|
|
if (*s == ',')
|
|
++s;
|
|
s = skip_spaces_const (s);
|
|
|
|
if (*s == '+')
|
|
{
|
|
LONGEST len;
|
|
|
|
++s;
|
|
v = parse_to_comma_and_eval (&s);
|
|
len = value_as_long (v);
|
|
if (len == 0)
|
|
{
|
|
do_cleanups (old_cleanups);
|
|
printf_filtered (_("Empty search range.\n"));
|
|
return;
|
|
}
|
|
if (len < 0)
|
|
error (_("Invalid length."));
|
|
/* Watch for overflows. */
|
|
if (len > CORE_ADDR_MAX
|
|
|| (start_addr + len - 1) < start_addr)
|
|
error (_("Search space too large."));
|
|
search_space_len = len;
|
|
}
|
|
else
|
|
{
|
|
CORE_ADDR end_addr;
|
|
|
|
v = parse_to_comma_and_eval (&s);
|
|
end_addr = value_as_address (v);
|
|
if (start_addr > end_addr)
|
|
error (_("Invalid search space, end precedes start."));
|
|
search_space_len = end_addr - start_addr + 1;
|
|
/* We don't support searching all of memory
|
|
(i.e. start=0, end = 0xff..ff).
|
|
Bail to avoid overflows later on. */
|
|
if (search_space_len == 0)
|
|
error (_("Overflow in address range "
|
|
"computation, choose smaller range."));
|
|
}
|
|
|
|
if (*s == ',')
|
|
++s;
|
|
|
|
/* Fetch the search string. */
|
|
|
|
while (*s != '\0')
|
|
{
|
|
LONGEST x;
|
|
struct type *t;
|
|
ULONGEST pattern_buf_size_need;
|
|
|
|
s = skip_spaces_const (s);
|
|
|
|
v = parse_to_comma_and_eval (&s);
|
|
t = value_type (v);
|
|
|
|
/* Keep it simple and assume size == 'g' when watching for when we
|
|
need to grow the pattern buf. */
|
|
pattern_buf_size_need = (pattern_buf_end - pattern_buf
|
|
+ max (TYPE_LENGTH (t), sizeof (int64_t)));
|
|
if (pattern_buf_size_need > pattern_buf_size)
|
|
{
|
|
size_t current_offset = pattern_buf_end - pattern_buf;
|
|
|
|
pattern_buf_size = pattern_buf_size_need * 2;
|
|
pattern_buf = xrealloc (pattern_buf, pattern_buf_size);
|
|
pattern_buf_end = pattern_buf + current_offset;
|
|
}
|
|
|
|
if (size != '\0')
|
|
{
|
|
x = value_as_long (v);
|
|
switch (size)
|
|
{
|
|
case 'b':
|
|
*pattern_buf_end++ = x;
|
|
break;
|
|
case 'h':
|
|
put_bits (x, pattern_buf_end, 16, big_p);
|
|
pattern_buf_end += sizeof (int16_t);
|
|
break;
|
|
case 'w':
|
|
put_bits (x, pattern_buf_end, 32, big_p);
|
|
pattern_buf_end += sizeof (int32_t);
|
|
break;
|
|
case 'g':
|
|
put_bits (x, pattern_buf_end, 64, big_p);
|
|
pattern_buf_end += sizeof (int64_t);
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
memcpy (pattern_buf_end, value_contents (v), TYPE_LENGTH (t));
|
|
pattern_buf_end += TYPE_LENGTH (t);
|
|
}
|
|
|
|
if (*s == ',')
|
|
++s;
|
|
s = skip_spaces_const (s);
|
|
}
|
|
|
|
if (pattern_buf_end == pattern_buf)
|
|
error (_("Missing search pattern."));
|
|
|
|
pattern_len = pattern_buf_end - pattern_buf;
|
|
|
|
if (search_space_len < pattern_len)
|
|
error (_("Search space too small to contain pattern."));
|
|
|
|
*max_countp = max_count;
|
|
*pattern_bufp = pattern_buf;
|
|
*pattern_lenp = pattern_len;
|
|
*start_addrp = start_addr;
|
|
*search_space_lenp = search_space_len;
|
|
|
|
/* We successfully parsed the arguments, leave the freeing of PATTERN_BUF
|
|
to the caller now. */
|
|
discard_cleanups (old_cleanups);
|
|
}
|
|
|
|
static void
|
|
find_command (char *args, int from_tty)
|
|
{
|
|
struct gdbarch *gdbarch = get_current_arch ();
|
|
bfd_boolean big_p = gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG;
|
|
/* Command line parameters.
|
|
These are initialized to avoid uninitialized warnings from -Wall. */
|
|
ULONGEST max_count = 0;
|
|
gdb_byte *pattern_buf = 0;
|
|
ULONGEST pattern_len = 0;
|
|
CORE_ADDR start_addr = 0;
|
|
ULONGEST search_space_len = 0;
|
|
/* End of command line parameters. */
|
|
unsigned int found_count;
|
|
CORE_ADDR last_found_addr;
|
|
struct cleanup *old_cleanups;
|
|
|
|
parse_find_args (args, &max_count, &pattern_buf, &pattern_len,
|
|
&start_addr, &search_space_len, big_p);
|
|
|
|
old_cleanups = make_cleanup (free_current_contents, &pattern_buf);
|
|
|
|
/* Perform the search. */
|
|
|
|
found_count = 0;
|
|
last_found_addr = 0;
|
|
|
|
while (search_space_len >= pattern_len
|
|
&& found_count < max_count)
|
|
{
|
|
/* Offset from start of this iteration to the next iteration. */
|
|
ULONGEST next_iter_incr;
|
|
CORE_ADDR found_addr;
|
|
int found = target_search_memory (start_addr, search_space_len,
|
|
pattern_buf, pattern_len, &found_addr);
|
|
|
|
if (found <= 0)
|
|
break;
|
|
|
|
print_address (gdbarch, found_addr, gdb_stdout);
|
|
printf_filtered ("\n");
|
|
++found_count;
|
|
last_found_addr = found_addr;
|
|
|
|
/* Begin next iteration at one byte past this match. */
|
|
next_iter_incr = (found_addr - start_addr) + 1;
|
|
|
|
/* For robustness, we don't let search_space_len go -ve here. */
|
|
if (search_space_len >= next_iter_incr)
|
|
search_space_len -= next_iter_incr;
|
|
else
|
|
search_space_len = 0;
|
|
start_addr += next_iter_incr;
|
|
}
|
|
|
|
/* Record and print the results. */
|
|
|
|
set_internalvar_integer (lookup_internalvar ("numfound"), found_count);
|
|
if (found_count > 0)
|
|
{
|
|
struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
|
|
|
|
set_internalvar (lookup_internalvar ("_"),
|
|
value_from_pointer (ptr_type, last_found_addr));
|
|
}
|
|
|
|
if (found_count == 0)
|
|
printf_filtered ("Pattern not found.\n");
|
|
else
|
|
printf_filtered ("%d pattern%s found.\n", found_count,
|
|
found_count > 1 ? "s" : "");
|
|
|
|
do_cleanups (old_cleanups);
|
|
}
|
|
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
|
extern initialize_file_ftype _initialize_mem_search;
|
|
|
|
void
|
|
_initialize_mem_search (void)
|
|
{
|
|
add_cmd ("find", class_vars, find_command, _("\
|
|
Search memory for a sequence of bytes.\n\
|
|
Usage:\nfind \
|
|
[/size-char] [/max-count] start-address, end-address, expr1 [, expr2 ...]\n\
|
|
find [/size-char] [/max-count] start-address, +length, expr1 [, expr2 ...]\n\
|
|
size-char is one of b,h,w,g for 8,16,32,64 bit values respectively,\n\
|
|
and if not specified the size is taken from the type of the expression\n\
|
|
in the current language.\n\
|
|
Note that this means for example that in the case of C-like languages\n\
|
|
a search for an untyped 0x42 will search for \"(int) 0x42\"\n\
|
|
which is typically four bytes.\n\
|
|
\n\
|
|
The address of the last match is stored as the value of \"$_\".\n\
|
|
Convenience variable \"$numfound\" is set to the number of matches."),
|
|
&cmdlist);
|
|
}
|