1 //===-- memprof_linux.cpp ------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is a part of MemProfiler, a memory profiler. 10 // 11 // Linux-specific details. 12 //===----------------------------------------------------------------------===// 13 14 #include "sanitizer_common/sanitizer_platform.h" 15 #if !SANITIZER_LINUX 16 #error Unsupported OS 17 #endif 18 19 #include "memprof_interceptors.h" 20 #include "memprof_internal.h" 21 #include "memprof_thread.h" 22 #include "sanitizer_common/sanitizer_flags.h" 23 #include "sanitizer_common/sanitizer_freebsd.h" 24 #include "sanitizer_common/sanitizer_libc.h" 25 #include "sanitizer_common/sanitizer_procmaps.h" 26 27 #include <dlfcn.h> 28 #include <fcntl.h> 29 #include <limits.h> 30 #include <link.h> 31 #include <pthread.h> 32 #include <stdio.h> 33 #include <sys/mman.h> 34 #include <sys/resource.h> 35 #include <sys/syscall.h> 36 #include <sys/time.h> 37 #include <sys/types.h> 38 #include <sys/ucontext.h> 39 #include <unistd.h> 40 #include <unwind.h> 41 42 extern ElfW(Dyn) _DYNAMIC[]; 43 44 typedef enum { 45 MEMPROF_RT_VERSION_UNDEFINED = 0, 46 MEMPROF_RT_VERSION_DYNAMIC, 47 MEMPROF_RT_VERSION_STATIC, 48 } memprof_rt_version_t; 49 50 // FIXME: perhaps also store abi version here? 51 extern "C" { 52 SANITIZER_INTERFACE_ATTRIBUTE 53 memprof_rt_version_t __memprof_rt_version; 54 } 55 56 namespace __memprof { 57 58 void InitializePlatformInterceptors() {} 59 void InitializePlatformExceptionHandlers() {} 60 61 void *MemprofDoesNotSupportStaticLinkage() { 62 // This will fail to link with -static. 63 return &_DYNAMIC; 64 } 65 66 uptr FindDynamicShadowStart() { 67 uptr shadow_size_bytes = MemToShadowSize(kHighMemEnd); 68 return MapDynamicShadow(shadow_size_bytes, SHADOW_SCALE, 69 /*min_shadow_base_alignment*/ 0, kHighMemEnd); 70 } 71 72 void ReadContextStack(void *context, uptr *stack, uptr *ssize) { 73 ucontext_t *ucp = (ucontext_t *)context; 74 *stack = (uptr)ucp->uc_stack.ss_sp; 75 *ssize = ucp->uc_stack.ss_size; 76 } 77 78 void *MemprofDlSymNext(const char *sym) { return dlsym(RTLD_NEXT, sym); } 79 80 } // namespace __memprof 81