| // Copyright 2017 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 <asm.h> |
| |
| // These could be in C if we compiled the one file without |
| // -fsanitize-coverage. But they are trivial enough in assembly. |
| |
| .macro trap |
| #ifdef __x86_64__ |
| ud2 |
| #elif defined(__aarch64__) |
| brk #1000 |
| #else |
| # error unsupported architecture |
| #endif |
| .endm |
| |
| // This should never be called, because the runtime should have been |
| // loaded before any module initializers get called. |
| ENTRY(__sanitizer_cov_trace_pc_guard_init) |
| trap |
| END(__sanitizer_cov_trace_pc_guard_init) |
| .weak __sanitizer_cov_trace_pc_guard_init |
| |
| // 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. |
| ENTRY(__sanitizer_cov_trace_pc_guard) |
| #ifdef __x86_64__ |
| cmpl $0, (%rdi) |
| jne 0f |
| ret |
| #elif defined(__aarch64__) |
| ldr w16, [x0] |
| cbnz w16, 0f |
| ret |
| #else |
| # error unsupported architecture |
| #endif |
| 0: trap |
| END(__sanitizer_cov_trace_pc_guard) |
| .weak __sanitizer_cov_trace_pc_guard |
