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d6f4a12fdb
Simulate a remote target address space by allocating a seperate chunk of memory for the target and re-mapping section addresses to that prior to execution. Later we'll want to have a truly remote process, but for now this gets us closer to being able to test the remote target functionality outside LLDB. rdar://12157052 llvm-svn: 163216
62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
//===- RemoteTarget.cpp - LLVM Remote process JIT execution --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Implementation of the RemoteTarget class which executes JITed code in a
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// separate address range from where it was built.
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//
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//===----------------------------------------------------------------------===//
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#include "RemoteTarget.h"
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#include <llvm/ADT/StringRef.h>
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#include <llvm/Support/Memory.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string>
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using namespace llvm;
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bool RemoteTarget::allocateSpace(size_t Size, unsigned Alignment,
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uint64_t &Address) {
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sys::MemoryBlock *Prev = Allocations.size() ? &Allocations.back() : NULL;
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sys::MemoryBlock Mem = sys::Memory::AllocateRWX(Size, Prev, &ErrorMsg);
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if (Mem.base() == NULL)
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return true;
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if ((uintptr_t)Mem.base() % Alignment) {
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ErrorMsg = "unable to allocate sufficiently aligned memory";
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return true;
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}
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Address = reinterpret_cast<uint64_t>(Mem.base());
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return false;
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}
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bool RemoteTarget::loadData(uint64_t Address, const void *Data, size_t Size) {
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memcpy ((void*)Address, Data, Size);
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sys::MemoryBlock Mem((void*)Address, Size);
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sys::Memory::setExecutable(Mem, &ErrorMsg);
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return false;
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}
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bool RemoteTarget::loadCode(uint64_t Address, const void *Data, size_t Size) {
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memcpy ((void*)Address, Data, Size);
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return false;
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}
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bool RemoteTarget::executeCode(uint64_t Address, int &RetVal) {
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int (*fn)(void) = (int(*)(void))Address;
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RetVal = fn();
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return false;
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}
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void RemoteTarget::create() {
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}
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void RemoteTarget::stop() {
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for (unsigned i = 0, e = Allocations.size(); i != e; ++i)
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sys::Memory::ReleaseRWX(Allocations[i]);
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}
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