Remove wrapper-link-and-translate from PNaCl and pnacl_shared_newlib from SCons.

src/untrusted/nacl/tls_using_ldso.c

-/*
- * Copyright (c) 2012 The Native Client Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-/*
- * Native Client support for thread local storage.
- *
- * This is a highly experimental hack which will work with glibc's ld.so.
- * Note: it probably wont work for ARM as is but we have no way
- * of testing this at this point. As we are lacking a dynamic loader
- * for that platform.
- */
-
-#include <stdint.h>
-
-#include "native_client/src/untrusted/nacl/nacl_thread.h"
-#include "native_client/src/untrusted/nacl/tls.h"
-#include "native_client/src/untrusted/nacl/tls_params.h"
-
-/*
- * These are part of ld.so's API and use a non-standard calling convention
- */
-#define REGPARM(n) __attribute__((regparm(n)))
-
-extern REGPARM(2) void _dl_get_tls_static_info(int *static_tls_size,
-                                               int *static_tls_align);
-extern void *_dl_allocate_tls (void *mem);
-
-/*
- * In case there is some mismatch between the combined areas of
- * glibc's and our pthread/tls code we add some safety margin on both ends
- * of the combined area.
- * This is probably not needed, especially since we believe that
- * the part of the (glibc) tdb which is accessed by ld.so is smaller than
- * our tdb.
- * On the other hand, we have not tried this we a big code bases
- * yet and if there were problems without the safty paddding
- * those would be really hard to track down. So it seems prudent
- * to leave them in for a while.
- *
- * TODO(robertm): set safety paddding to zero after we have tried
- *                this with big apps
- */
-
-#define SAFETY_PADDING 256
-
-static size_t aligned_size(size_t size, size_t alignment) {
-   return (size + alignment - 1) & -alignment;
-}
-
-static char *aligned_addr(void *start, size_t alignment) {
-  return (void *) aligned_size((size_t) start, alignment);
-}
-
-/*
- * this is ugly, but we need a way to communicate these from
- *  _dl_get_tls_static_info() to
- * __nacl_tls_initialize_memory()
- */
-static int tls_size;
-static int tls_align;
-
-size_t __nacl_tls_combined_size(size_t tdb_size) {
-  _dl_get_tls_static_info (&tls_size, &tls_align);
-  /*
-   * Disregarding the SAFETY_PADDING we need enough space
-   * to align the tdb which is sort of in the middle of combined area
-   * hence the extra "tls_size - 1"
-   * TODO(robertm): this may need to be adapted for ARM
-   */
-  return tls_size + tdb_size + (tls_size - 1) + 2 * SAFETY_PADDING;
-}
-
-void *__nacl_tls_initialize_memory(void *combined_area, size_t tdb_size) {
-  if (__nacl_tp_tdb_offset(tdb_size) != 0) {
-    /*
-     * This needs more work for ARM.
-     * For now abort via null pointer dereference.
-     */
-    while (1) *(volatile int *) 0;
-  } else {
-    void *tdb = aligned_addr(((char *) combined_area) + tls_size +
-                             SAFETY_PADDING , tls_align);
-    return _dl_allocate_tls(tdb);
-  }
-}