119 lines · cpp
1//===-- trusty.cpp ---------------------------------------------*- C++ -*-===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "platform.h"10 11#if SCUDO_TRUSTY12 13#include "common.h"14#include "mutex.h"15#include "report_linux.h"16#include "trusty.h"17 18#include <errno.h> // for errno19#include <lk/err_ptr.h> // for PTR_ERR and IS_ERR20#include <stdio.h> // for printf()21#include <stdlib.h> // for getenv()22#include <sys/auxv.h> // for getauxval()23#include <time.h> // for clock_gettime()24#include <trusty_err.h> // for lk_err_to_errno()25#include <trusty_syscalls.h> // for _trusty_brk()26#include <uapi/mm.h> // for MMAP flags27 28namespace scudo {29 30uptr getPageSize() { return getauxval(AT_PAGESZ); }31 32void NORETURN die() { abort(); }33 34void *map(void *Addr, uptr Size, const char *Name, uptr Flags,35 UNUSED MapPlatformData *Data) {36 uint32_t MmapFlags =37 MMAP_FLAG_ANONYMOUS | MMAP_FLAG_PROT_READ | MMAP_FLAG_PROT_WRITE;38 39 // If the MAP_NOACCESS flag is set, Scudo tries to reserve40 // a memory region without mapping physical pages. This corresponds41 // to MMAP_FLAG_NO_PHYSICAL in Trusty.42 if (Flags & MAP_NOACCESS)43 MmapFlags |= MMAP_FLAG_NO_PHYSICAL;44 if (Addr)45 MmapFlags |= MMAP_FLAG_FIXED_NOREPLACE;46 47 if (Flags & MAP_MEMTAG)48 MmapFlags |= MMAP_FLAG_PROT_MTE;49 50 void *P = (void *)_trusty_mmap(Addr, Size, MmapFlags, 0);51 52 if (IS_ERR(P)) {53 errno = lk_err_to_errno(PTR_ERR(P));54 if (!(Flags & MAP_ALLOWNOMEM) || errno != ENOMEM)55 reportMapError(Size);56 return nullptr;57 }58 59 return P;60}61 62void unmap(UNUSED void *Addr, UNUSED uptr Size, UNUSED uptr Flags,63 UNUSED MapPlatformData *Data) {64 if (_trusty_munmap(Addr, Size) != 0)65 reportUnmapError(reinterpret_cast<uptr>(Addr), Size);66}67 68void setMemoryPermission(UNUSED uptr Addr, UNUSED uptr Size, UNUSED uptr Flags,69 UNUSED MapPlatformData *Data) {}70 71void releasePagesToOS(UNUSED uptr BaseAddress, UNUSED uptr Offset,72 UNUSED uptr Size, UNUSED MapPlatformData *Data) {}73 74const char *getEnv(const char *Name) { return getenv(Name); }75 76// All mutex operations are a no-op since Trusty doesn't currently support77// threads.78bool HybridMutex::tryLock() { return true; }79 80void HybridMutex::lockSlow() {}81 82void HybridMutex::unlock() {}83 84void HybridMutex::assertHeldImpl() {}85 86u64 getMonotonicTime() {87 timespec TS;88 clock_gettime(CLOCK_MONOTONIC, &TS);89 return static_cast<u64>(TS.tv_sec) * (1000ULL * 1000 * 1000) +90 static_cast<u64>(TS.tv_nsec);91}92 93u64 getMonotonicTimeFast() {94#if defined(CLOCK_MONOTONIC_COARSE)95 timespec TS;96 clock_gettime(CLOCK_MONOTONIC_COARSE, &TS);97 return static_cast<u64>(TS.tv_sec) * (1000ULL * 1000 * 1000) +98 static_cast<u64>(TS.tv_nsec);99#else100 return getMonotonicTime();101#endif102}103 104u32 getNumberOfCPUs() { return 0; }105 106u32 getThreadID() { return 0; }107 108bool getRandom(UNUSED void *Buffer, UNUSED uptr Length, UNUSED bool Blocking) {109 return false;110}111 112void outputRaw(const char *Buffer) { printf("%s", Buffer); }113 114void setAbortMessage(UNUSED const char *Message) {}115 116} // namespace scudo117 118#endif // SCUDO_TRUSTY119