Loading...
--- /dev/null
+++ dyld/dyld-1160.6/libdyld/utils.cpp
@@ -0,0 +1,252 @@
+/*
+ * Copyright (c) 2021 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include <TargetConditionals.h>
+
+#if !TARGET_OS_EXCLAVEKIT
+
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <mach-o/utils.h>
+#include <mach-o/utils_priv.h>
+#include <mach-o/dyld_priv.h>
+
+#include "MachOFile.h"
+#include "FileUtils.h"
+#include "DyldDelegates.h"
+
+using dyld3::MachOFile;
+using dyld3::FatFile;
+using dyld3::GradedArchs;
+using dyld3::Platform;
+
+
+// used by unit tests
+__attribute__((visibility("hidden")))
+int macho_best_slice_fd_internal(int fd, Platform platform, const GradedArchs& launchArchs, const GradedArchs& dylibArchs, bool isOSBinary,
+ void (^bestSlice)(const struct mach_header* slice, uint64_t sliceOffset, size_t sliceSize));
+
+
+///
+/// arch-name <--> cpu-type
+///
+
+bool macho_cpu_type_for_arch_name(const char* archName, cpu_type_t* type, cpu_subtype_t* subtype)
+{
+ return MachOFile::cpuTypeFromArchName(archName, type, subtype);
+}
+
+const char* macho_arch_name_for_cpu_type(cpu_type_t type, cpu_subtype_t subtype)
+{
+ const char* result = MachOFile::archName(type, subtype);
+ if ( strcmp(result, "unknown") == 0 )
+ return nullptr;
+ return result;
+}
+
+const char* macho_arch_name_for_mach_header(const mach_header* mh)
+{
+ if ( mh == nullptr )
+ mh = _dyld_get_prog_image_header();
+ return macho_arch_name_for_cpu_type(mh->cputype, mh->cpusubtype);
+}
+
+
+
+///
+/// fat file utilities
+///
+
+int macho_for_each_slice(const char* path, void (^callback)(const struct mach_header* slice, uint64_t fileOffset, size_t size, bool* stop)__MACHO_NOESCAPE)
+{
+ int fd = ::open(path, O_RDONLY, 0);
+ if ( fd == -1 )
+ return errno;
+
+ int result = macho_for_each_slice_in_fd(fd, callback);
+ ::close(fd);
+ return result;
+}
+
+int macho_for_each_slice_in_fd(int fd, void (^callback)(const struct mach_header* slice, uint64_t fileOffset, size_t size, bool* stop)__MACHO_NOESCAPE)
+{
+ struct stat statbuf;
+ if ( ::fstat(fd, &statbuf) == -1 )
+ return errno;
+
+ const void* mappedFile = ::mmap(nullptr, (size_t)statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ if ( mappedFile == MAP_FAILED )
+ return errno;
+
+ int result = 0;
+ Diagnostics diag;
+ if ( const FatFile* ff = FatFile::isFatFile(mappedFile) ) {
+ ff->forEachSlice(diag, statbuf.st_size, ^(uint32_t sliceCpuType, uint32_t sliceCpuSubType, const void* sliceStart, uint64_t sliceSize, bool& stop) {
+ size_t sliceOffset = (uint8_t*)sliceStart - (uint8_t*)mappedFile;
+ if ( callback )
+ callback((mach_header*)sliceStart, sliceOffset, (size_t)sliceSize, &stop);
+ });
+ if ( diag.hasError() )
+ result = EBADMACHO;
+ }
+ else if ( ((MachOFile*)mappedFile)->isMachO(diag, statbuf.st_size) ) {
+ bool stop;
+ if ( callback )
+ callback((mach_header*)mappedFile, 0, (size_t)statbuf.st_size, &stop);
+ }
+ else {
+ // not a fat file nor a mach-o file
+ result = EFTYPE;
+ }
+
+ ::munmap((void*)mappedFile, (size_t)statbuf.st_size);
+ return result;
+}
+
+
+int macho_best_slice(const char* path, void (^bestSlice)(const struct mach_header* slice, uint64_t sliceFileOffset, size_t sliceSize)__MACHO_NOESCAPE)
+{
+ int fd = ::open(path, O_RDONLY, 0);
+ if ( fd == -1 )
+ return errno;
+
+ int result = macho_best_slice_in_fd(fd, bestSlice);
+ ::close(fd);
+
+ return result;
+}
+
+static bool launchableOnCurrentPlatform(const MachOFile* mf)
+{
+#if TARGET_OS_OSX
+ // macOS is special and can launch macOS, catalyst, and iOS apps
+ return ( mf->builtForPlatform(Platform::macOS) || mf->builtForPlatform(Platform::iOSMac) || mf->builtForPlatform(Platform::iOS) );
+#else
+ return mf->builtForPlatform(MachOFile::currentPlatform());
+#endif
+}
+
+// use directly by unit tests
+int macho_best_slice_fd_internal(int fd, Platform platform, const GradedArchs& launchArchs, const GradedArchs& dylibArchs, bool isOSBinary,
+ void (^ _Nullable bestSlice)(const struct mach_header* slice, uint64_t fileOffset, size_t sliceSize))
+{
+ struct stat statbuf;
+ if ( ::fstat(fd, &statbuf) == -1 )
+ return errno;
+
+ // FIXME: possible that mmap() of the whole file will fail on memory constrainted devices (e.g. watch), so may need to read() instead
+ const void* mappedFile = ::mmap(nullptr, (size_t)statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ if ( mappedFile == MAP_FAILED )
+ return errno;
+
+ Diagnostics diag;
+ int result = 0;
+ if ( const FatFile* ff = FatFile::isFatFile(mappedFile) ) {
+ __block int bestGrade = 0;
+ __block uint64_t sliceOffset = 0;
+ __block uint64_t sliceLen = 0;
+ ff->forEachSlice(diag, statbuf.st_size, ^(uint32_t sliceCpuType, uint32_t sliceCpuSubType, const void* sliceStart, uint64_t sliceSize, bool& stop) {
+ if ( const MachOFile* mf = MachOFile::isMachO(sliceStart) ) {
+ if ( mf->filetype == MH_EXECUTE ) {
+ int sliceGrade = launchArchs.grade(mf->cputype, mf->cpusubtype, isOSBinary);
+ if ( (sliceGrade > bestGrade) && launchableOnCurrentPlatform(mf) ) {
+ sliceOffset = (char*)sliceStart - (char*)mappedFile;
+ sliceLen = sliceSize;
+ bestGrade = sliceGrade;
+ }
+ }
+ else {
+ int sliceGrade = dylibArchs.grade(mf->cputype, mf->cpusubtype, isOSBinary);
+ if ( (sliceGrade > bestGrade) && mf->loadableIntoProcess(platform, "") ) {
+ sliceOffset = (char*)sliceStart - (char*)mappedFile;
+ sliceLen = sliceSize;
+ bestGrade = sliceGrade;
+ }
+ }
+ }
+ });
+ if ( diag.hasError() )
+ return EBADMACHO;
+
+ if ( bestGrade != 0 ) {
+ if ( bestSlice )
+ bestSlice((MachOFile*)((char*)mappedFile + sliceOffset), (size_t)sliceOffset, (size_t)sliceLen);
+ }
+ else
+ result = EBADARCH;
+ }
+ else if ( const MachOFile* mf = MachOFile::isMachO(mappedFile) ) {
+ if ( (mf->filetype == MH_EXECUTE) && (launchArchs.grade(mf->cputype, mf->cpusubtype, isOSBinary) != 0) && launchableOnCurrentPlatform(mf) ) {
+ // the "best" of a main executable must pass grading and be a launchable
+ if ( bestSlice )
+ bestSlice(mf, 0, (size_t)statbuf.st_size);
+ }
+ else if ( (dylibArchs.grade(mf->cputype, mf->cpusubtype, isOSBinary) != 0) && mf->loadableIntoProcess(platform, "") ) {
+ // the "best" of a dylib/bundle must pass grading and match the platform of the current process
+ if ( bestSlice )
+ bestSlice(mf, 0, (size_t)statbuf.st_size);
+ }
+ else {
+ result = EBADARCH;
+ }
+ }
+ else {
+ // not a fat file nor a mach-o file
+ result = EFTYPE;
+ }
+
+ ::munmap((void*)mappedFile, (size_t)statbuf.st_size);
+ return result;
+}
+
+
+int macho_best_slice_in_fd(int fd, void (^bestSlice)(const struct mach_header* slice, uint64_t sliceFileOffset, size_t sliceSize)__MACHO_NOESCAPE)
+{
+ const Platform platform = MachOFile::currentPlatform();
+ const GradedArchs* launchArchs = &GradedArchs::forCurrentOS(false, false);
+ const GradedArchs* dylibArchs = &GradedArchs::forCurrentOS(false, false);
+#if TARGET_OS_SIMULATOR
+ const char* simArchNames = getenv("SIMULATOR_ARCHS");
+ if ( simArchNames == nullptr )
+ simArchNames = "x86_64";
+ launchArchs = &GradedArchs::launchCurrentOS(simArchNames);
+#endif
+ return macho_best_slice_fd_internal(fd, platform, *launchArchs, *dylibArchs, false, bestSlice);
+}
+
+
+///
+/// utils_priv.h
+///
+///
+const char* _Nullable macho_dylib_install_name(const struct mach_header* _Nonnull mh) DYLD_EXCLAVEKIT_UNAVAILABLE
+{
+ if ( const MachOFile* mf = MachOFile::isMachO(mh) )
+ return mf->installName();
+
+ return nullptr;
+}
+
+#endif // !TARGET_OS_EXCLAVEKIT