forked from Imagelibrary/binutils-gdb
1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2012-2024 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <string.h>
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#define CHUNK_SIZE 16000 /* same as findcmd.c's */
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void *global_var_0;
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void *global_var_1;
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void *global_var_2;
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void
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breakpt ()
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{
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/* Nothing. */
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}
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int
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main (void)
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{
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void *p;
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size_t pg_size;
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int pg_count;
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void *unmapped_page, *last_mapped_page, *first_mapped_page;
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/*
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Map enough pages to cover at least CHUNK_SIZE, and one extra page. We
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then unmap the last page.
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From gdb we can then perform find commands into unmapped region, gdb
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should give an error.
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.-- global_var_0 .-- global_var_1
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.----.----.----.----.----.
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| | | | | |
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'----'----'----'----'----'
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|<- CHUNK_SIZE ->|
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If CHUNK_SIZE equals page size then we'll get 3 pages, and if
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CHUNK_SIZE is less than page size we'll get 2 pages. The test will
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still work in these cases.
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(1) We do a find from global_var_0 to global_var_2, this will fail when
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loading the second chunk, as we know at least CHUNK_SIZE bytes are in
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mapped space.
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(2) We do a find from global_var_1 to global_var_2, this will fail when
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loading the first chunk, assuming the CHUNK_SIZE is at least 16 bytes.
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(3) We do a find from global_var_2 to (global_var_2 + 16), this too
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will fail when loading the first chunk regardless of the chunk size.
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*/
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pg_size = getpagesize ();
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/* The +2 ensures the extra page. */
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pg_count = CHUNK_SIZE / pg_size + 2;
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p = mmap (0, pg_count * pg_size, PROT_READ|PROT_WRITE,
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MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
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if (p == MAP_FAILED)
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{
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perror ("mmap");
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return EXIT_FAILURE;
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}
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memset (p, 0, pg_count * pg_size);
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if (munmap (p + (pg_count - 1) * pg_size, pg_size) == -1)
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{
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perror ("munmap");
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return EXIT_FAILURE;
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}
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first_mapped_page = p;
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last_mapped_page = p + (pg_count - 2) * pg_size;
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unmapped_page = last_mapped_page + pg_size;
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/* Setup global variables we reference from gdb. */
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global_var_0 = first_mapped_page;
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global_var_1 = unmapped_page - 16;
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global_var_2 = unmapped_page + 16;
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breakpt ();
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return EXIT_SUCCESS;
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}
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