3 #include "pthread_impl.h"
10 static size_t len, size, align;
12 void *__copy_tls(unsigned char *mem)
15 if (!image) return mem;
16 void **dtv = (void *)mem;
18 mem += __libc.tls_size - sizeof(struct pthread);
19 mem -= (uintptr_t)mem & (align-1);
24 memcpy(mem, image, len);
28 void *__tls_get_addr(size_t *v)
30 return (char *)__pthread_self()->dtv[1]+v[1];
33 static void *simple(void *p)
36 return __set_thread_area(p) ? 0 : p;
39 weak_alias(simple, __install_initial_tls);
41 void *__mmap(void *, size_t, int, int, int, off_t);
43 #if ULONG_MAX == 0xffffffff
44 typedef Elf32_Phdr Phdr;
46 typedef Elf64_Phdr Phdr;
51 void __init_tls(size_t *auxv)
53 size_t i, aux[AUX_CNT] = { 0 };
54 unsigned char *p, *mem;
56 Phdr *phdr, *tls_phdr=0;
59 for (; auxv[0]; auxv+=2) if (auxv[0]<AUX_CNT) aux[auxv[0]] = auxv[1];
60 p = (void *)aux[AT_PHDR];
61 for (p=(void *)aux[AT_PHDR]; aux[AT_PHNUM]--; p+=aux[AT_PHENT]) {
63 if (phdr->p_type == PT_PHDR)
64 base = aux[AT_PHDR] - phdr->p_vaddr;
65 if (phdr->p_type == PT_TLS)
68 if (!tls_phdr) return;
70 image = (void *)(base + tls_phdr->p_vaddr);
71 len = tls_phdr->p_filesz;
72 size = tls_phdr->p_memsz;
73 align = tls_phdr->p_align;
75 size += (-size - (uintptr_t)image) & (align-1);
76 if (align < 4*sizeof(size_t)) align = 4*sizeof(size_t);
78 libc.tls_size = 2*sizeof(void *)+size+align+sizeof(struct pthread);
80 mem = __mmap(0, libc.tls_size, PROT_READ|PROT_WRITE,
81 MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
82 if (mem == MAP_FAILED) a_crash();
84 if (!__install_initial_tls(__copy_tls(mem))) a_crash();
87 void __init_tls(size_t *auxv) { }