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Diffstat (limited to 'standalone/trusty.cpp')
-rw-r--r-- | standalone/trusty.cpp | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/standalone/trusty.cpp b/standalone/trusty.cpp new file mode 100644 index 00000000000..81d6bc585f0 --- /dev/null +++ b/standalone/trusty.cpp @@ -0,0 +1,100 @@ +//===-- trusty.cpp ---------------------------------------------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "platform.h" + +#if SCUDO_TRUSTY + +#include "common.h" +#include "mutex.h" +#include "string_utils.h" +#include "trusty.h" + +#include <errno.h> // for errno +#include <stdio.h> // for printf() +#include <stdlib.h> // for getenv() +#include <sys/auxv.h> // for getauxval() +#include <time.h> // for clock_gettime() +#include <trusty_syscalls.h> // for _trusty_brk() + +#define SBRK_ALIGN 32 + +namespace scudo { + +uptr getPageSize() { return getauxval(AT_PAGESZ); } + +void NORETURN die() { abort(); } + +void *map(UNUSED void *Addr, uptr Size, UNUSED const char *Name, uptr Flags, + UNUSED MapPlatformData *Data) { + // Calling _trusty_brk(0) returns the current program break. + uptr ProgramBreak = reinterpret_cast<uptr>(_trusty_brk(0)); + uptr Start; + uptr End; + + Start = roundUpTo(ProgramBreak, SBRK_ALIGN); + // Don't actually extend the heap if MAP_NOACCESS flag is set since this is + // the case where Scudo tries to reserve a memory region without mapping + // physical pages. + if (Flags & MAP_NOACCESS) + return reinterpret_cast<void *>(Start); + + // Attempt to extend the heap by Size bytes using _trusty_brk. + End = roundUpTo(Start + Size, SBRK_ALIGN); + ProgramBreak = + reinterpret_cast<uptr>(_trusty_brk(reinterpret_cast<void *>(End))); + if (ProgramBreak < End) { + errno = ENOMEM; + dieOnMapUnmapError(Size); + return nullptr; + } + return reinterpret_cast<void *>(Start); // Base of new reserved region. +} + +// Unmap is a no-op since Trusty uses sbrk instead of memory mapping. +void unmap(UNUSED void *Addr, UNUSED uptr Size, UNUSED uptr Flags, + UNUSED MapPlatformData *Data) {} + +void setMemoryPermission(UNUSED uptr Addr, UNUSED uptr Size, UNUSED uptr Flags, + UNUSED MapPlatformData *Data) {} + +void releasePagesToOS(UNUSED uptr BaseAddress, UNUSED uptr Offset, + UNUSED uptr Size, UNUSED MapPlatformData *Data) {} + +const char *getEnv(const char *Name) { return getenv(Name); } + +// All mutex operations are a no-op since Trusty doesn't currently support +// threads. +bool HybridMutex::tryLock() { return true; } + +void HybridMutex::lockSlow() {} + +void HybridMutex::unlock() {} + +u64 getMonotonicTime() { + timespec TS; + clock_gettime(CLOCK_MONOTONIC, &TS); + return static_cast<u64>(TS.tv_sec) * (1000ULL * 1000 * 1000) + + static_cast<u64>(TS.tv_nsec); +} + +u32 getNumberOfCPUs() { return 0; } + +u32 getThreadID() { return 0; } + +bool getRandom(UNUSED void *Buffer, UNUSED uptr Length, UNUSED bool Blocking) { + return false; +} + +void outputRaw(const char *Buffer) { printf("%s", Buffer); } + +void setAbortMessage(UNUSED const char *Message) {} + +} // namespace scudo + +#endif // SCUDO_TRUSTY |