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.
108 lines
2.7 KiB
C
108 lines
2.7 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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size_t pg_size;
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void *first_mapped_page;
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void *last_mapped_page;
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void
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breakpt (void)
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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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int pg_count;
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size_t i;
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/* Map 6 contiguous pages, and then unmap all second first, and
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second last.
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From GDB we will disassemble each of the _mapped_ pages, with a
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code-cache (dcache) line size bigger than the page size (twice
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bigger). This makes GDB try to read one page before the mapped
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page once, and the page after another time. GDB should give no
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error in either case.
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That is, depending on where the kernel aligns the pages, we get
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either:
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.---.---.---.---.---.---.
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| U | M | U | U | M | U |
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'---'---'---'---'---'---.
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| | | | <- line alignment
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^^^^^^^ ^^^^^^^
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+ line1 + line2
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Or:
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.---.---.---.---.---.---.
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| U | M | U | U | M | U |
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'---'---'---'---'---'---.
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| | | <- line alignment
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^^^^^^^ ^^^^^^^
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line1 + + line2
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Note we really want to test that dcache behaves correctly when
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reading a cache line fails. We're just using unmapped memory as
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proxy for any kind of error. */
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pg_size = getpagesize ();
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pg_count = 6;
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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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/* Leave memory zero-initialized. Disassembling 0s should behave on
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all targets. */
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for (i = 0; i < pg_count; i++)
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{
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if (i == 1 || i == 4)
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continue;
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if (munmap (p + (i * 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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}
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first_mapped_page = p + 1 * pg_size;;
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last_mapped_page = p + 4 * pg_size;
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breakpt ();
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return EXIT_SUCCESS;
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}
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