6 #include "pthread_impl.h"
11 int __init_tp(void *p)
15 int r = __set_thread_area(TP_ADJ(p));
17 if (!r) libc.can_do_threads = 1;
18 td->tid = __syscall(SYS_set_tid_address, &td->tid);
19 td->locale = &libc.global_locale;
20 td->robust_list.head = &td->robust_list.head;
24 static struct builtin_tls {
29 #define MIN_TLS_ALIGN offsetof(struct builtin_tls, pt)
31 static struct tls_module main_tls;
33 void *__copy_tls(unsigned char *mem)
41 dtv = (void **)(mem + libc.tls_size) - (libc.tls_cnt + 1);
43 mem += -((uintptr_t)mem + sizeof(struct pthread)) & (libc.tls_align-1);
45 mem += sizeof(struct pthread);
47 for (i=1, p=libc.tls_head; p; i++, p=p->next) {
48 dtv[i] = mem + p->offset;
49 memcpy(dtv[i], p->image, p->len);
54 mem += libc.tls_size - sizeof(struct pthread);
55 mem -= (uintptr_t)mem & (libc.tls_align-1);
58 for (i=1, p=libc.tls_head; p; i++, p=p->next) {
59 dtv[i] = mem - p->offset;
60 memcpy(dtv[i], p->image, p->len);
63 dtv[0] = (void *)libc.tls_cnt;
64 td->dtv = td->dtv_copy = dtv;
68 #if ULONG_MAX == 0xffffffff
69 typedef Elf32_Phdr Phdr;
71 typedef Elf64_Phdr Phdr;
74 __attribute__((__weak__, __visibility__("hidden")))
75 extern const size_t _DYNAMIC[];
77 static void static_init_tls(size_t *aux)
81 Phdr *phdr, *tls_phdr=0;
85 for (p=(void *)aux[AT_PHDR],n=aux[AT_PHNUM]; n; n--,p+=aux[AT_PHENT]) {
87 if (phdr->p_type == PT_PHDR)
88 base = aux[AT_PHDR] - phdr->p_vaddr;
89 if (phdr->p_type == PT_DYNAMIC && _DYNAMIC)
90 base = (size_t)_DYNAMIC - phdr->p_vaddr;
91 if (phdr->p_type == PT_TLS)
96 main_tls.image = (void *)(base + tls_phdr->p_vaddr);
97 main_tls.len = tls_phdr->p_filesz;
98 main_tls.size = tls_phdr->p_memsz;
99 main_tls.align = tls_phdr->p_align;
101 libc.tls_head = &main_tls;
104 main_tls.size += (-main_tls.size - (uintptr_t)main_tls.image)
105 & (main_tls.align-1);
106 if (main_tls.align < MIN_TLS_ALIGN) main_tls.align = MIN_TLS_ALIGN;
108 main_tls.offset = main_tls.size;
111 libc.tls_align = main_tls.align;
112 libc.tls_size = 2*sizeof(void *) + sizeof(struct pthread)
113 + main_tls.size + main_tls.align
114 + MIN_TLS_ALIGN-1 & -MIN_TLS_ALIGN;
116 if (libc.tls_size > sizeof builtin_tls) {
118 #define SYS_mmap2 SYS_mmap
120 mem = (void *)__syscall(
122 0, libc.tls_size, PROT_READ|PROT_WRITE,
123 MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
124 /* -4095...-1 cast to void * will crash on dereference anyway,
125 * so don't bloat the init code checking for error codes and
126 * explicitly calling a_crash(). */
131 /* Failure to initialize thread pointer is always fatal. */
132 if (__init_tp(__copy_tls(mem)) < 0)
136 weak_alias(static_init_tls, __init_tls);