| // Copyright 2019 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 "sancov-stubs.h" |
| |
| // This file defines all the entry points that -fsanitize-coverage=... |
| // instrumentation calls. Unfortunately, LLVM does not publish any header |
| // file declaring those signatures, though they are all given in |
| // compiler-rt/lib/sanitizer_common/sanitizer_interface_internal.h. |
| // |
| // The definitions here are all weak symbols and they are just sufficient |
| // for any calls that might be made by the dynamic linker startup path |
| // before it has finished loading and relocating the actual coverage |
| // runtime provided in the executable or some shared library. Definitions |
| // for everything that libc itself refers to must be provided here, even if |
| // they will never be reached at runtime. |
| |
| #include <cstdint> |
| |
| // This should never be called, because the runtime should have been |
| // loaded before any module initializers get called. |
| [[gnu::weak]] extern "C" void __sanitizer_cov_trace_pc_guard_init(uint32_t*, |
| uint32_t*) { |
| __builtin_trap(); |
| } |
| |
| // This is called only from __asan_early_init, which is the only thing |
| // called during dynamic linker startup before the runtime has been |
| // loaded that's outside dynlink.c, where _dynlink_sancov_trampoline |
| // short-circuits before calling here. Just sanity-check that we |
| // aren't getting here after module initializers have run. |
| [[gnu::weak]] extern "C" void __sanitizer_cov_trace_pc_guard(uint32_t* guard) { |
| if (*guard != 0) { |
| __builtin_trap(); |
| } |
| } |
| |
| // There are many hooks that are called a lot but can always safely |
| // just do nothing. |
| |
| #define SANCOV_STUB(name) \ |
| [[gnu::weak]] extern "C" void __sanitizer_cov_##name() {} |
| |
| SANCOV_NOOP_STUBS |
| |
| #undef SANCOV_STUB |
