107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2012-2016 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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| |
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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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