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->detach_state = DT_JOINABLE;
19 td->tid = __syscall(SYS_set_tid_address, &td->detach_state);
20 td->locale = &libc.global_locale;
21 td->robust_list.head = &td->robust_list.head;
25 static struct builtin_tls {
30 #define MIN_TLS_ALIGN offsetof(struct builtin_tls, pt)
32 static struct tls_module main_tls;
34 void *__copy_tls(unsigned char *mem)
42 dtv = (void **)(mem + libc.tls_size) - (libc.tls_cnt + 1);
44 mem += -((uintptr_t)mem + sizeof(struct pthread)) & (libc.tls_align-1);
46 mem += sizeof(struct pthread);
48 for (i=1, p=libc.tls_head; p; i++, p=p->next) {
49 dtv[i] = mem + p->offset;
50 memcpy(dtv[i], p->image, p->len);
55 mem += libc.tls_size - sizeof(struct pthread);
56 mem -= (uintptr_t)mem & (libc.tls_align-1);
59 for (i=1, p=libc.tls_head; p; i++, p=p->next) {
60 dtv[i] = mem - p->offset;
61 memcpy(dtv[i], p->image, p->len);
64 dtv[0] = (void *)libc.tls_cnt;
65 td->dtv = td->dtv_copy = dtv;
69 #if ULONG_MAX == 0xffffffff
70 typedef Elf32_Phdr Phdr;
72 typedef Elf64_Phdr Phdr;
75 __attribute__((__weak__, __visibility__("hidden")))
76 extern const size_t _DYNAMIC[];
78 static void static_init_tls(size_t *aux)
82 Phdr *phdr, *tls_phdr=0;
86 for (p=(void *)aux[AT_PHDR],n=aux[AT_PHNUM]; n; n--,p+=aux[AT_PHENT]) {
88 if (phdr->p_type == PT_PHDR)
89 base = aux[AT_PHDR] - phdr->p_vaddr;
90 if (phdr->p_type == PT_DYNAMIC && _DYNAMIC)
91 base = (size_t)_DYNAMIC - phdr->p_vaddr;
92 if (phdr->p_type == PT_TLS)
97 main_tls.image = (void *)(base + tls_phdr->p_vaddr);
98 main_tls.len = tls_phdr->p_filesz;
99 main_tls.size = tls_phdr->p_memsz;
100 main_tls.align = tls_phdr->p_align;
102 libc.tls_head = &main_tls;
105 main_tls.size += (-main_tls.size - (uintptr_t)main_tls.image)
106 & (main_tls.align-1);
108 main_tls.offset = GAP_ABOVE_TP;
109 main_tls.offset += -GAP_ABOVE_TP & (main_tls.align-1);
111 main_tls.offset = main_tls.size;
113 if (main_tls.align < MIN_TLS_ALIGN) main_tls.align = MIN_TLS_ALIGN;
115 libc.tls_align = main_tls.align;
116 libc.tls_size = 2*sizeof(void *) + sizeof(struct pthread)
120 + main_tls.size + main_tls.align
121 + MIN_TLS_ALIGN-1 & -MIN_TLS_ALIGN;
123 if (libc.tls_size > sizeof builtin_tls) {
125 #define SYS_mmap2 SYS_mmap
127 mem = (void *)__syscall(
129 0, libc.tls_size, PROT_READ|PROT_WRITE,
130 MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
131 /* -4095...-1 cast to void * will crash on dereference anyway,
132 * so don't bloat the init code checking for error codes and
133 * explicitly calling a_crash(). */
138 /* Failure to initialize thread pointer is always fatal. */
139 if (__init_tp(__copy_tls(mem)) < 0)
143 weak_alias(static_init_tls, __init_tls);