void __init_tls(size_t *aux)
{
unsigned char *p, *mem;
size_t n;
Phdr *phdr, *tls_phdr=0;
size_t base = 0;
libc.tls_size = sizeof(struct pthread);
for (p=(void *)aux[AT_PHDR],n=aux[AT_PHNUM]; n; n--,p+=aux[AT_PHENT]) {
phdr = (void *)p;
if (phdr->p_type == PT_PHDR)
base = aux[AT_PHDR] - phdr->p_vaddr;
if (phdr->p_type == PT_TLS)
tls_phdr = phdr;
}
if (!tls_phdr) return;
image = (void *)(base + tls_phdr->p_vaddr);
len = tls_phdr->p_filesz;
size = tls_phdr->p_memsz;
align = tls_phdr->p_align;
size += (-size - (uintptr_t)image) & (align-1);
if (align < 4*sizeof(size_t)) align = 4*sizeof(size_t);
libc.tls_size = 2*sizeof(void *)+size+align+sizeof(struct pthread);
mem = __mmap(0, libc.tls_size, PROT_READ|PROT_WRITE,
MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
if (!__install_initial_tls(__copy_tls(mem))) a_crash();
}
static void static_init_tls(size_t* aux) {
unsigned char* p;
size_t n;
Phdr *phdr, *tls_phdr = 0;
size_t base = 0;
void* mem;
for (p = (void*)aux[AT_PHDR], n = aux[AT_PHNUM]; n; n--, p += aux[AT_PHENT]) {
phdr = (void*)p;
if (phdr->p_type == PT_PHDR)
base = aux[AT_PHDR] - phdr->p_vaddr;
if (phdr->p_type == PT_TLS)
tls_phdr = phdr;
}
if (tls_phdr) {
main_tls.image = (void*)(base + tls_phdr->p_vaddr);
main_tls.len = tls_phdr->p_filesz;
main_tls.size = tls_phdr->p_memsz;
main_tls.align = tls_phdr->p_align;
libc.tls_cnt = 1;
libc.tls_head = &main_tls;
}
main_tls.size +=
(-main_tls.size - (uintptr_t)main_tls.image) & (main_tls.align - 1);
if (main_tls.align < MIN_TLS_ALIGN)
main_tls.align = MIN_TLS_ALIGN;
#ifndef TLS_ABOVE_TP
main_tls.offset = main_tls.size;
#endif
libc.tls_align = main_tls.align;
libc.tls_size = 2 * sizeof(void*) + sizeof(struct pthread) + main_tls.size +
main_tls.align + MIN_TLS_ALIGN - 1 &
-MIN_TLS_ALIGN;
if (libc.tls_size > sizeof builtin_tls) {
#ifndef SYS_mmap2
#define SYS_mmap2 SYS_mmap
#endif
mem = (void*)__syscall(SYS_mmap2, 0, libc.tls_size, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
/* -4095...-1 cast to void * will crash on dereference anyway,
* so don't bloat the init code checking for error codes and
* explicitly calling a_crash(). */
} else {
mem = builtin_tls;
}
/* Failure to initialize thread pointer is always fatal. */
if (__init_tp(__copy_tls(mem)) < 0)
a_crash();
}
void __stack_chk_fail(void)
{
a_crash();
}
