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qemu/tests/tcg/multiarch/test-mmap.c
Alex Bennée e2bcd3ad09 tests/tcg: make test-mmap a little less aggressive 
The check_aligned_anonymous_unfixed_mmaps and
check_aligned_anonymous_unfixed_colliding_mmaps do a lot of mmap's and
copying of data. This is especially unfriendly to targets like hexagon
which have quite large pages and need to do sanity checks on each
memory access.

While we are at it clean-up the white space and style issues from the
legacy code. As we no longer do quite so much needless memory access
we can also remove the hexagon timeout hack.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <20210709143005.1554-27-alex.bennee@linaro.org>
2021-07-14 14:33:53 +01:00

505 lines
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/*
* Small test program to verify simulated mmap behaviour.
*
* When running qemu-linux-user with the -p flag, you may need to tell
* this test program about the pagesize because getpagesize() will not reflect
* the -p choice. Simply pass one argument being the pagesize.
*
* Copyright (c) 2007 AXIS Communications AB
* Written by Edgar E. Iglesias.
*
* 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 2 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 <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/mman.h>
#define D(x)
#define fail_unless(x) \
do \
{ \
if (!(x)) { \
fprintf(stderr, "FAILED at %s:%d\n", __FILE__, __LINE__); \
exit (EXIT_FAILURE); \
} \
} while (0)
unsigned char *dummybuf;
static unsigned int pagesize;
static unsigned int pagemask;
int test_fd;
size_t test_fsize;
void check_aligned_anonymous_unfixed_mmaps(void)
{
void *p1;
void *p2;
void *p3;
void *p4;
void *p5;
uintptr_t p;
int i;
fprintf(stdout, "%s", __func__);
for (i = 0; i < 8; i++) {
size_t len;
len = pagesize + (pagesize * i);
p1 = mmap(NULL, len, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
p2 = mmap(NULL, len, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
p3 = mmap(NULL, len, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
p4 = mmap(NULL, len, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
p5 = mmap(NULL, len, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
/*
* Make sure we get pages aligned with the pagesize. The
* target expects this.
*/
fail_unless(p1 != MAP_FAILED);
fail_unless(p2 != MAP_FAILED);
fail_unless(p3 != MAP_FAILED);
fail_unless(p4 != MAP_FAILED);
fail_unless(p5 != MAP_FAILED);
p = (uintptr_t) p1;
D(printf("p=%x\n", p));
fail_unless((p & pagemask) == 0);
p = (uintptr_t) p2;
fail_unless((p & pagemask) == 0);
p = (uintptr_t) p3;
fail_unless((p & pagemask) == 0);
p = (uintptr_t) p4;
fail_unless((p & pagemask) == 0);
p = (uintptr_t) p5;
fail_unless((p & pagemask) == 0);
/* Make sure we can read from the entire area. */
memcpy(dummybuf, p1, pagesize);
memcpy(dummybuf, p2, pagesize);
memcpy(dummybuf, p3, pagesize);
memcpy(dummybuf, p4, pagesize);
memcpy(dummybuf, p5, pagesize);
munmap(p1, len);
munmap(p2, len);
munmap(p3, len);
munmap(p4, len);
munmap(p5, len);
}
fprintf(stdout, " passed\n");
}
void check_large_anonymous_unfixed_mmap(void)
{
void *p1;
uintptr_t p;
size_t len;
fprintf(stdout, "%s", __func__);
len = 0x02000000;
p1 = mmap(NULL, len, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
/* Make sure we get pages aligned with the pagesize. The
target expects this. */
fail_unless (p1 != MAP_FAILED);
p = (uintptr_t) p1;
fail_unless ((p & pagemask) == 0);
/* Make sure we can read from the entire area. */
memcpy (dummybuf, p1, pagesize);
munmap (p1, len);
fprintf(stdout, " passed\n");
}
void check_aligned_anonymous_unfixed_colliding_mmaps(void)
{
char *p1;
char *p2;
char *p3;
uintptr_t p;
int i;
fprintf(stdout, "%s", __func__);
for (i = 0; i < 2; i++) {
int nlen;
p1 = mmap(NULL, pagesize, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
fail_unless(p1 != MAP_FAILED);
p = (uintptr_t) p1;
fail_unless((p & pagemask) == 0);
memcpy(dummybuf, p1, pagesize);
p2 = mmap(NULL, pagesize, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
fail_unless(p2 != MAP_FAILED);
p = (uintptr_t) p2;
fail_unless((p & pagemask) == 0);
memcpy(dummybuf, p2, pagesize);
munmap(p1, pagesize);
nlen = pagesize * 8;
p3 = mmap(NULL, nlen, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
fail_unless(p3 != MAP_FAILED);
/* Check if the mmaped areas collide. */
if (p3 < p2
&& (p3 + nlen) > p2) {
fail_unless(0);
}
memcpy(dummybuf, p3, pagesize);
/*
* Make sure we get pages aligned with the pagesize. The
* target expects this.
*/
p = (uintptr_t) p3;
fail_unless((p & pagemask) == 0);
munmap(p2, pagesize);
munmap(p3, nlen);
}
fprintf(stdout, " passed\n");
}
void check_aligned_anonymous_fixed_mmaps(void)
{
char *addr;
void *p1;
uintptr_t p;
int i;
/* Find a suitable address to start with. */
addr = mmap(NULL, pagesize * 40, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS,
-1, 0);
fprintf(stdout, "%s addr=%p", __func__, addr);
fail_unless (addr != MAP_FAILED);
for (i = 0; i < 40; i++)
{
/* Create submaps within our unfixed map. */
p1 = mmap(addr, pagesize, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
-1, 0);
/* Make sure we get pages aligned with the pagesize.
The target expects this. */
p = (uintptr_t) p1;
fail_unless (p1 == addr);
fail_unless ((p & pagemask) == 0);
memcpy (dummybuf, p1, pagesize);
munmap (p1, pagesize);
addr += pagesize;
}
fprintf(stdout, " passed\n");
}
void check_aligned_anonymous_fixed_mmaps_collide_with_host(void)
{
char *addr;
void *p1;
uintptr_t p;
int i;
/* Find a suitable address to start with. Right were the x86 hosts
stack is. */
addr = ((void *)0x80000000);
fprintf(stdout, "%s addr=%p", __func__, addr);
fprintf(stdout, "FIXME: QEMU fails to track pages used by the host.");
for (i = 0; i < 20; i++)
{
/* Create submaps within our unfixed map. */
p1 = mmap(addr, pagesize, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
-1, 0);
/* Make sure we get pages aligned with the pagesize.
The target expects this. */
p = (uintptr_t) p1;
fail_unless (p1 == addr);
fail_unless ((p & pagemask) == 0);
memcpy (p1, dummybuf, pagesize);
munmap (p1, pagesize);
addr += pagesize;
}
fprintf(stdout, " passed\n");
}
void check_file_unfixed_mmaps(void)
{
unsigned int *p1, *p2, *p3;
uintptr_t p;
int i;
fprintf(stdout, "%s", __func__);
for (i = 0; i < 0x10; i++)
{
size_t len;
len = pagesize;
p1 = mmap(NULL, len, PROT_READ,
MAP_PRIVATE,
test_fd, 0);
p2 = mmap(NULL, len, PROT_READ,
MAP_PRIVATE,
test_fd, pagesize);
p3 = mmap(NULL, len, PROT_READ,
MAP_PRIVATE,
test_fd, pagesize * 2);
fail_unless (p1 != MAP_FAILED);
fail_unless (p2 != MAP_FAILED);
fail_unless (p3 != MAP_FAILED);
/* Make sure we get pages aligned with the pagesize. The
target expects this. */
p = (uintptr_t) p1;
fail_unless ((p & pagemask) == 0);
p = (uintptr_t) p2;
fail_unless ((p & pagemask) == 0);
p = (uintptr_t) p3;
fail_unless ((p & pagemask) == 0);
/* Verify that the file maps was made correctly. */
D(printf ("p1=%d p2=%d p3=%d\n", *p1, *p2, *p3));
fail_unless (*p1 == 0);
fail_unless (*p2 == (pagesize / sizeof *p2));
fail_unless (*p3 == ((pagesize * 2) / sizeof *p3));
memcpy (dummybuf, p1, pagesize);
memcpy (dummybuf, p2, pagesize);
memcpy (dummybuf, p3, pagesize);
munmap (p1, len);
munmap (p2, len);
munmap (p3, len);
}
fprintf(stdout, " passed\n");
}
void check_file_unfixed_eof_mmaps(void)
{
char *cp;
unsigned int *p1;
uintptr_t p;
int i;
fprintf(stdout, "%s", __func__);
for (i = 0; i < 0x10; i++)
{
p1 = mmap(NULL, pagesize, PROT_READ,
MAP_PRIVATE,
test_fd,
(test_fsize - sizeof *p1) & ~pagemask);
fail_unless (p1 != MAP_FAILED);
/* Make sure we get pages aligned with the pagesize. The
target expects this. */
p = (uintptr_t) p1;
fail_unless ((p & pagemask) == 0);
/* Verify that the file maps was made correctly. */
fail_unless (p1[(test_fsize & pagemask) / sizeof *p1 - 1]
== ((test_fsize - sizeof *p1) / sizeof *p1));
/* Verify that the end of page is accessible and zeroed. */
cp = (void *) p1;
fail_unless (cp[pagesize - 4] == 0);
munmap (p1, pagesize);
}
fprintf(stdout, " passed\n");
}
void check_file_fixed_eof_mmaps(void)
{
char *addr;
char *cp;
unsigned int *p1;
uintptr_t p;
int i;
/* Find a suitable address to start with. */
addr = mmap(NULL, pagesize * 44, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS,
-1, 0);
fprintf(stdout, "%s addr=%p", __func__, (void *)addr);
fail_unless (addr != MAP_FAILED);
for (i = 0; i < 0x10; i++)
{
/* Create submaps within our unfixed map. */
p1 = mmap(addr, pagesize, PROT_READ,
MAP_PRIVATE | MAP_FIXED,
test_fd,
(test_fsize - sizeof *p1) & ~pagemask);
fail_unless (p1 != MAP_FAILED);
/* Make sure we get pages aligned with the pagesize. The
target expects this. */
p = (uintptr_t) p1;
fail_unless ((p & pagemask) == 0);
/* Verify that the file maps was made correctly. */
fail_unless (p1[(test_fsize & pagemask) / sizeof *p1 - 1]
== ((test_fsize - sizeof *p1) / sizeof *p1));
/* Verify that the end of page is accessible and zeroed. */
cp = (void *)p1;
fail_unless (cp[pagesize - 4] == 0);
munmap (p1, pagesize);
addr += pagesize;
}
fprintf(stdout, " passed\n");
}
void check_file_fixed_mmaps(void)
{
unsigned char *addr;
unsigned int *p1, *p2, *p3, *p4;
int i;
/* Find a suitable address to start with. */
addr = mmap(NULL, pagesize * 40 * 4, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS,
-1, 0);
fprintf(stdout, "%s addr=%p", __func__, (void *)addr);
fail_unless (addr != MAP_FAILED);
for (i = 0; i < 40; i++)
{
p1 = mmap(addr, pagesize, PROT_READ,
MAP_PRIVATE | MAP_FIXED,
test_fd, 0);
p2 = mmap(addr + pagesize, pagesize, PROT_READ,
MAP_PRIVATE | MAP_FIXED,
test_fd, pagesize);
p3 = mmap(addr + pagesize * 2, pagesize, PROT_READ,
MAP_PRIVATE | MAP_FIXED,
test_fd, pagesize * 2);
p4 = mmap(addr + pagesize * 3, pagesize, PROT_READ,
MAP_PRIVATE | MAP_FIXED,
test_fd, pagesize * 3);
/* Make sure we get pages aligned with the pagesize.
The target expects this. */
fail_unless (p1 == (void *)addr);
fail_unless (p2 == (void *)addr + pagesize);
fail_unless (p3 == (void *)addr + pagesize * 2);
fail_unless (p4 == (void *)addr + pagesize * 3);
/* Verify that the file maps was made correctly. */
fail_unless (*p1 == 0);
fail_unless (*p2 == (pagesize / sizeof *p2));
fail_unless (*p3 == ((pagesize * 2) / sizeof *p3));
fail_unless (*p4 == ((pagesize * 3) / sizeof *p4));
memcpy (dummybuf, p1, pagesize);
memcpy (dummybuf, p2, pagesize);
memcpy (dummybuf, p3, pagesize);
memcpy (dummybuf, p4, pagesize);
munmap (p1, pagesize);
munmap (p2, pagesize);
munmap (p3, pagesize);
munmap (p4, pagesize);
addr += pagesize * 4;
}
fprintf(stdout, " passed\n");
}
void checked_write(int fd, const void *buf, size_t count)
{
ssize_t rc = write(fd, buf, count);
fail_unless(rc == count);
}
void check_invalid_mmaps(void)
{
unsigned char *addr;
/* Attempt to map a zero length page. */
addr = mmap(NULL, 0, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
fprintf(stdout, "%s addr=%p", __func__, (void *)addr);
fail_unless(addr == MAP_FAILED);
fail_unless(errno == EINVAL);
/* Attempt to map a over length page. */
addr = mmap(NULL, -4, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
fprintf(stdout, "%s addr=%p", __func__, (void *)addr);
fail_unless(addr == MAP_FAILED);
fail_unless(errno == ENOMEM);
fprintf(stdout, " passed\n");
}
int main(int argc, char **argv)
{
char tempname[] = "/tmp/.cmmapXXXXXX";
unsigned int i;
/* Trust the first argument, otherwise probe the system for our
pagesize. */
if (argc > 1)
pagesize = strtoul(argv[1], NULL, 0);
else
pagesize = sysconf(_SC_PAGESIZE);
/* Assume pagesize is a power of two. */
pagemask = pagesize - 1;
dummybuf = malloc (pagesize);
printf ("pagesize=%u pagemask=%x\n", pagesize, pagemask);
test_fd = mkstemp(tempname);
unlink(tempname);
/* Fill the file with int's counting from zero and up. */
for (i = 0; i < (pagesize * 4) / sizeof i; i++) {
checked_write(test_fd, &i, sizeof i);
}
/* Append a few extra writes to make the file end at non
page boundary. */
checked_write(test_fd, &i, sizeof i); i++;
checked_write(test_fd, &i, sizeof i); i++;
checked_write(test_fd, &i, sizeof i); i++;
test_fsize = lseek(test_fd, 0, SEEK_CUR);
/* Run the tests. */
check_aligned_anonymous_unfixed_mmaps();
check_aligned_anonymous_unfixed_colliding_mmaps();
check_aligned_anonymous_fixed_mmaps();
check_file_unfixed_mmaps();
check_file_fixed_mmaps();
check_file_fixed_eof_mmaps();
check_file_unfixed_eof_mmaps();
check_invalid_mmaps();
/* Fails at the moment. */
/* check_aligned_anonymous_fixed_mmaps_collide_with_host(); */
return EXIT_SUCCESS;
}
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