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#include <elf.h>
#include <limits.h>
#include <sys/mman.h>
#include <string.h>
#include "pthread_impl.h"
#include "libc.h"
#include "atomic.h"
#ifndef SHARED
static void *image;
static size_t len, size, align;
void *__copy_tls(unsigned char *mem)
{
pthread_t td;
if (!image) return mem;
void **dtv = (void *)mem;
dtv[0] = (void *)1;
#ifdef TLS_ABOVE_TP
mem += sizeof(void *) * 2;
mem += -((uintptr_t)mem + sizeof(struct pthread)) & (align-1);
td = (pthread_t)mem;
mem += sizeof(struct pthread);
#else
mem += libc.tls_size - sizeof(struct pthread);
mem -= (uintptr_t)mem & (align-1);
td = (pthread_t)mem;
mem -= size;
#endif
td->dtv = dtv;
dtv[1] = mem;
memcpy(mem, image, len);
return td;
}
void *__tls_get_addr(size_t *v)
{
return (char *)__pthread_self()->dtv[1]+v[1];
}
static void *simple(void *p)
{
*(void **)p = p;
return __set_thread_area(TP_ADJ(p)) ? 0 : p;
}
weak_alias(simple, __install_initial_tls);
void *__mmap(void *, size_t, int, int, int, off_t);
#if ULONG_MAX == 0xffffffff
typedef Elf32_Phdr Phdr;
#else
typedef Elf64_Phdr Phdr;
#endif
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();
}
#else
void __init_tls(size_t *auxv) { }
#endif
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