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