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Make mmap() work better

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- Mapping file offsets now works on Windows
- Mapping stack memory now works on OpenBSD
This commit is contained in:
Justine Tunney 2021-02-03 00:10:12 -08:00
parent 23a14b537c
commit 27c899af56
10 changed files with 71 additions and 56 deletions
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36
test/libc/runtime/mmap_test.c
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@ -88,6 +88,42 @@ TEST(mmap, testMapFixed_destroysEverythingInItsPath) {
EXPECT_NE(-1, munmap((void *)kFixedmapStart, FRAMESIZE * 3));
}
TEST(mmap, customStackMemory_isAuthorized) {
char *stack;
uintptr_t w, r;
ASSERT_NE(MAP_FAILED,
(stack = mmap(NULL, STACKSIZE, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE | MAP_GROWSDOWN, -1, 0)));
asm("mov\t%%rsp,%0\n\t"
"mov\t%2,%%rsp\n\t"
"push\t%3\n\t"
"pop\t%1\n\t"
"mov\t%0,%%rsp"
: "=&r"(w), "=&r"(r)
: "rm"(stack + STACKSIZE - 8), "i"(123));
ASSERT_EQ(123, r);
}
TEST(mmap, fileOffset) {
int fd;
char *map;
char testdir[PATH_MAX];
sprintf(testdir, "o/tmp/%s.%d", program_invocation_short_name, getpid());
ASSERT_NE(-1, makedirs(testdir, 0755));
ASSERT_NE(-1, chdir(testdir));
ASSERT_NE(-1, (fd = open("foo", O_CREAT | O_RDWR, 0644)));
EXPECT_NE(-1, ftruncate(fd, FRAMESIZE * 2));
EXPECT_NE(-1, pwrite(fd, "hello", 5, FRAMESIZE * 0));
EXPECT_NE(-1, pwrite(fd, "there", 5, FRAMESIZE * 1));
ASSERT_NE(MAP_FAILED, (map = mmap(NULL, FRAMESIZE, PROT_READ, MAP_PRIVATE, fd,
FRAMESIZE)));
EXPECT_EQ(0, memcmp(map, "there", 5), "%#.*s", 5, map);
EXPECT_NE(-1, munmap(map, FRAMESIZE));
EXPECT_NE(-1, close(fd));
ASSERT_NE(-1, chdir("../../.."));
ASSERT_NE(-1, rmrf(testdir));
}
TEST(isheap, nullPtr) {
ASSERT_FALSE(isheap(NULL));
}