| // Copyright 2023 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <lib/ld/abi.h> |
| #include <lib/ld/tls.h> |
| #include <zircon/compiler.h> |
| |
| namespace ld::abi { |
| |
| __EXPORT void* __tls_get_addr(const elfldltl::Elf<>::TlsGetAddrGot& got) { |
| if (got.tls_modid == 0) [[unlikely]] { |
| // Note that glibc doesn't handle this case properly at all, and is liable |
| // to crash if it gets called. It's clearly only intended for undefined |
| // weak TLS symbols to be allowed if they aren't actually referenced in |
| // live code paths at runtime. |
| return nullptr; |
| } |
| // TODO(mcgrathr): the libc version would also need a hook for libdl here, |
| // when modid >= _ld_abi.static_tls_offsets.size(). But it might just want to |
| // be replaced with a version that always uses the DTV. This startup-only |
| // implementation has the advantage of not needing a DTV. |
| return TpRelative(TlsInitialExecOffset(_ld_abi, got.tls_modid) + |
| static_cast<ptrdiff_t>(got.offset)); |
| } |
| |
| } // namespace ld::abi |
