#include <elf.h>
#include <limits.h>
+#include <sys/mman.h>
+#include <string.h>
+#include <stddef.h>
#include "pthread_impl.h"
#include "libc.h"
#include "atomic.h"
+#include "syscall.h"
+
+#ifndef SHARED
+static
+#endif
+int __init_tp(void *p)
+{
+ pthread_t td = p;
+ td->self = td;
+ int r = __set_thread_area(TP_ADJ(p));
+ if (r < 0) return -1;
+ if (!r) libc.can_do_threads = 1;
+ td->tid = __syscall(SYS_set_tid_address, &td->tid);
+ td->locale = &libc.global_locale;
+ td->robust_list.head = &td->robust_list.head;
+ return 0;
+}
#ifndef SHARED
-static void *image;
-static size_t len, size, align;
+static struct builtin_tls {
+ char c;
+ struct pthread pt;
+ void *space[16];
+} builtin_tls[1];
+#define MIN_TLS_ALIGN offsetof(struct builtin_tls, pt)
+
+struct tls_image {
+ void *image;
+ size_t len, size, align;
+} __static_tls;
+
+#define T __static_tls
void *__copy_tls(unsigned char *mem)
{
pthread_t td;
- if (!image) return mem;
+ if (!T.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);
+ mem += -((uintptr_t)mem + sizeof(struct pthread)) & (T.align-1);
td = (pthread_t)mem;
mem += sizeof(struct pthread);
#else
- mem += __libc.tls_size - sizeof(struct pthread);
- mem -= (uintptr_t)mem & (align-1);
+ mem += libc.tls_size - sizeof(struct pthread);
+ mem -= (uintptr_t)mem & (T.align-1);
td = (pthread_t)mem;
- td->dtv = dtv;
- mem -= size;
+ mem -= T.size;
#endif
+ td->dtv = td->dtv_copy = dtv;
dtv[1] = mem;
- memcpy(mem, image, len);
+ memcpy(mem, T.image, T.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
void __init_tls(size_t *aux)
{
- unsigned char *p, *mem;
- size_t n, d;
+ unsigned char *p;
+ size_t n;
Phdr *phdr, *tls_phdr=0;
size_t base = 0;
-
- libc.tls_size = sizeof(struct pthread);
+ 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_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;
+ if (tls_phdr) {
+ T.image = (void *)(base + tls_phdr->p_vaddr);
+ T.len = tls_phdr->p_filesz;
+ T.size = tls_phdr->p_memsz;
+ T.align = tls_phdr->p_align;
+ }
+
+ T.size += (-T.size - (uintptr_t)T.image) & (T.align-1);
+ if (T.align < MIN_TLS_ALIGN) T.align = MIN_TLS_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 *)+T.size+T.align+sizeof(struct pthread)
+ + MIN_TLS_ALIGN-1 & -MIN_TLS_ALIGN;
- libc.tls_size = 2*sizeof(void *)+size+align+sizeof(struct pthread);
+ 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;
+ }
- 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();
+ /* Failure to initialize thread pointer is always fatal. */
+ if (__init_tp(__copy_tls(mem)) < 0)
+ a_crash();
}
#else
void __init_tls(size_t *auxv) { }