3 #include "pthread_impl.h"
10 static size_t len, bss, align;
12 void *__copy_tls(unsigned char *mem, size_t cnt)
14 mem += ((uintptr_t)image - (uintptr_t)mem) & (align-1);
15 memcpy(mem, image, len);
16 return mem + len + bss;
19 static void *simple(void *p)
22 return __set_thread_area(p) ? 0 : p;
25 weak_alias(simple, __install_initial_tls);
27 void *__mmap(void *, size_t, int, int, int, off_t);
29 #if ULONG_MAX == 0xffffffff
30 typedef Elf32_Phdr Phdr;
32 typedef Elf64_Phdr Phdr;
37 void __init_tls(size_t *auxv)
39 size_t i, aux[AUX_CNT] = { 0 };
40 unsigned char *p, *mem;
42 Phdr *phdr, *tls_phdr=0;
45 for (; auxv[0]; auxv+=2) if (auxv[0]<AUX_CNT) aux[auxv[0]] = auxv[1];
46 p = (void *)aux[AT_PHDR];
47 for (p=(void *)aux[AT_PHDR]; aux[AT_PHNUM]--; p+=aux[AT_PHENT]) {
49 if (phdr->p_type == PT_PHDR)
50 base = aux[AT_PHDR] - phdr->p_vaddr;
51 if (phdr->p_type == PT_TLS)
54 if (!tls_phdr) return;
56 libc.tls_size = len+bss+align+4*sizeof(size_t)+sizeof(struct pthread);
58 image = (void *)(base + tls_phdr->p_vaddr);
59 len = tls_phdr->p_filesz;
60 bss = tls_phdr->p_memsz - len;
61 align = tls_phdr->p_align;
62 if (align < 4*sizeof(size_t)) align = 4*sizeof(size_t);
63 mem = __mmap(0, libc.tls_size, PROT_READ|PROT_WRITE,
64 MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
65 if (mem == MAP_FAILED) a_crash();
67 if (!__install_initial_tls(__copy_tls(mem, 0))) a_crash();
70 void __init_tls(size_t *auxv) { }