mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-21 01:12:32 +08:00
18d2988e5d
Now that defs.h, server.h and common-defs.h are included via the `-include` option, it is no longer necessary for source files to include them. Remove all the inclusions of these files I could find. Update the generation scripts where relevant. Change-Id: Ia026cff269c1b7ae7386dd3619bc9bb6a5332837 Approved-By: Pedro Alves <pedro@palves.net>
120 lines
3.6 KiB
C++
120 lines
3.6 KiB
C++
/* Target memory searching
|
|
|
|
Copyright (C) 2020-2024 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 "gdbsupport/search.h"
|
|
#include "gdbsupport/byte-vector.h"
|
|
|
|
/* This implements a basic search of memory, reading target memory and
|
|
performing the search here (as opposed to performing the search in on the
|
|
target side with, for example, gdbserver). */
|
|
|
|
int
|
|
simple_search_memory
|
|
(gdb::function_view<target_read_memory_ftype> read_memory,
|
|
CORE_ADDR start_addr, ULONGEST search_space_len,
|
|
const gdb_byte *pattern, ULONGEST pattern_len,
|
|
CORE_ADDR *found_addrp)
|
|
{
|
|
const unsigned chunk_size = SEARCH_CHUNK_SIZE;
|
|
/* Buffer to hold memory contents for searching. */
|
|
unsigned search_buf_size;
|
|
|
|
search_buf_size = chunk_size + pattern_len - 1;
|
|
|
|
/* No point in trying to allocate a buffer larger than the search space. */
|
|
if (search_space_len < search_buf_size)
|
|
search_buf_size = search_space_len;
|
|
|
|
gdb::byte_vector search_buf (search_buf_size);
|
|
|
|
/* Prime the search buffer. */
|
|
|
|
if (!read_memory (start_addr, search_buf.data (), search_buf_size))
|
|
{
|
|
warning (_("Unable to access %s bytes of target "
|
|
"memory at %s, halting search."),
|
|
pulongest (search_buf_size), hex_string (start_addr));
|
|
return -1;
|
|
}
|
|
|
|
/* Perform the search.
|
|
|
|
The loop is kept simple by allocating [N + pattern-length - 1] bytes.
|
|
When we've scanned N bytes we copy the trailing bytes to the start and
|
|
read in another N bytes. */
|
|
|
|
while (search_space_len >= pattern_len)
|
|
{
|
|
gdb_byte *found_ptr;
|
|
unsigned nr_search_bytes
|
|
= std::min (search_space_len, (ULONGEST) search_buf_size);
|
|
|
|
found_ptr = (gdb_byte *) memmem (search_buf.data (), nr_search_bytes,
|
|
pattern, pattern_len);
|
|
|
|
if (found_ptr != NULL)
|
|
{
|
|
CORE_ADDR found_addr = start_addr + (found_ptr - search_buf.data ());
|
|
|
|
*found_addrp = found_addr;
|
|
return 1;
|
|
}
|
|
|
|
/* Not found in this chunk, skip to next chunk. */
|
|
|
|
/* Don't let search_space_len wrap here, it's unsigned. */
|
|
if (search_space_len >= chunk_size)
|
|
search_space_len -= chunk_size;
|
|
else
|
|
search_space_len = 0;
|
|
|
|
if (search_space_len >= pattern_len)
|
|
{
|
|
unsigned keep_len = search_buf_size - chunk_size;
|
|
CORE_ADDR read_addr = start_addr + chunk_size + keep_len;
|
|
int nr_to_read;
|
|
|
|
/* Copy the trailing part of the previous iteration to the front
|
|
of the buffer for the next iteration. */
|
|
gdb_assert (keep_len == pattern_len - 1);
|
|
if (keep_len > 0)
|
|
memcpy (&search_buf[0], &search_buf[chunk_size], keep_len);
|
|
|
|
nr_to_read = std::min (search_space_len - keep_len,
|
|
(ULONGEST) chunk_size);
|
|
|
|
if (!read_memory (read_addr, &search_buf[keep_len], nr_to_read))
|
|
{
|
|
warning (_("Unable to access %s bytes of target "
|
|
"memory at %s, halting search."),
|
|
plongest (nr_to_read),
|
|
hex_string (read_addr));
|
|
return -1;
|
|
}
|
|
|
|
start_addr += chunk_size;
|
|
}
|
|
}
|
|
|
|
/* Not found. */
|
|
|
|
return 0;
|
|
}
|