76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
/* Cydia Substrate - Powerful Code Insertion Platform
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* Copyright (C) 2008-2011 Jay Freeman (saurik)
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*/
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/* GNU Lesser General Public License, Version 3 {{{ */
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/*
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* Substrate is free software: you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* Substrate is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Substrate. If not, see <http://www.gnu.org/licenses/>.
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**/
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/* }}} */
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#define SubstrateInternal
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#include "CydiaSubstrate.h"
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#include "SubstrateLog.hpp"
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#include <sys/mman.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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extern "C" void __clear_cache (void *beg, void *end);
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struct __SubstrateMemory {
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void *address_;
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size_t width_;
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__SubstrateMemory(void *address, size_t width) :
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address_(address),
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width_(width)
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{
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}
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};
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extern "C" SubstrateMemoryRef SubstrateMemoryCreate(SubstrateAllocatorRef allocator, SubstrateProcessRef process, void *data, size_t size) {
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if (allocator != NULL) {
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MSLog(MSLogLevelError, "MS:Error:allocator != %d", 0);
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return NULL;
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}
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if (size == 0)
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return NULL;
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long page(sysconf(_SC_PAGESIZE)); // Portable applications should employ sysconf(_SC_PAGESIZE) instead of getpagesize
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uintptr_t base(reinterpret_cast<uintptr_t>(data) / page * page);
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size_t width(((reinterpret_cast<uintptr_t>(data) + size - 1) / page + 1) * page - base);
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void *address(reinterpret_cast<void *>(base));
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if (mprotect(address, width, PROT_READ | PROT_WRITE | PROT_EXEC) == -1) {
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MSLog(MSLogLevelError, "MS:Error:mprotect() = %d", errno);
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return NULL;
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}
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return new __SubstrateMemory(address, width);
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}
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extern "C" void SubstrateMemoryRelease(SubstrateMemoryRef memory) {
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if (mprotect(memory->address_, memory->width_, PROT_READ | PROT_WRITE | PROT_EXEC) == -1)
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MSLog(MSLogLevelError, "MS:Error:mprotect() = %d", errno);
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__clear_cache(reinterpret_cast<char *>(memory->address_), reinterpret_cast<char *>(memory->address_) + memory->width_);
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delete memory;
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}
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