void read_chunk_tls(void *fptr, int action)
{
struct user_desc u;
int ret;
read_bit(fptr, &u, sizeof(struct user_desc));
if (!u.base_addr)
return;
if (action & ACTION_PRINT)
fprintf(stderr, "TLS entry (%d): base_addr = 0x%lx",
u.entry_number, u.base_addr);
if (!(action & ACTION_LOAD))
return;
if (!emulate_tls) {
ret = set_thread_area(NULL);
if (ret == -1) /* some libcs return the actual errno instead of -1 */
ret = -errno;
if (ret == -ENOSYS) {
/* We are not a TLS capable system. Turn on TLS emulation voodoo. */
emulate_tls = 1;
/* We'll need write access to the code segments to do this. */
extra_prot_flags |= PROT_WRITE;
}
}
if (emulate_tls)
tls_base_address = u.base_addr;
else
syscall_check(set_thread_area(&u), 0, "set_thread_area");
}
int prog(void)
{
unsigned long fs;
struct user_desc ta;
fs = get_fs();
printf("FS: %lu\n", fs);
ta.entry_number = 0;
get_thread_area(&ta);
printf("TA: entry=%d, base=%lu, length=%d\n", ta.entry_number, ta.base_addr, ta.limit);
ta.entry_number = 1;
get_thread_area(&ta);
printf("TA: entry=%d, base=%lu, length=%d\n", ta.entry_number, ta.base_addr, ta.limit);
ta.entry_number = 2;
get_thread_area(&ta);
printf("TA: entry=%d, base=%lu, length=%d\n", ta.entry_number, ta.base_addr, ta.limit);
ta.entry_number = 3;
get_thread_area(&ta);
printf("TA: entry=%d, base=%lu, length=%d\n", ta.entry_number, ta.base_addr, ta.limit);
ta.entry_number = 3;
ta.base_addr = 0x10000;
ta.limit = 100;
set_thread_area(&ta);
memset(&ta, 0, sizeof(struct user_desc));
ta.entry_number = 3;
get_thread_area(&ta);
printf("TA: entry=%d, base=%lu, length=%d\n", ta.entry_number, ta.base_addr, ta.limit);
ta.entry_number = 2;
get_thread_area(&ta);
printf("TA: entry=%d, base=%lu, length=%d\n", ta.entry_number, ta.base_addr, ta.limit);
usleep(500000);
}