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//===- ARMPLT.cpp -----------------------------------------------------------===//
//
// The MCLinker Project
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ARMGOT.h"
#include "ARMPLT.h"
#include <new>
#include <llvm/Support/Casting.h>
#include <mcld/LD/LDSection.h>
#include <mcld/Support/MsgHandling.h>
using namespace mcld;
ARMPLT0::ARMPLT0(SectionData& pParent)
: PLT::Entry<sizeof(arm_plt0)>(pParent) {}
ARMPLT1::ARMPLT1(SectionData& pParent)
: PLT::Entry<sizeof(arm_plt1)>(pParent) {}
//===----------------------------------------------------------------------===//
// ARMPLT
ARMPLT::ARMPLT(LDSection& pSection, ARMGOT &pGOTPLT)
: PLT(pSection), m_GOT(pGOTPLT) {
new ARMPLT0(*m_pSectionData);
}
ARMPLT::~ARMPLT()
{
}
bool ARMPLT::hasPLT1() const
{
return (m_pSectionData->size() > 1);
}
void ARMPLT::finalizeSectionSize()
{
uint64_t size = (m_pSectionData->size() - 1) * sizeof(arm_plt1) +
sizeof(arm_plt0);
m_Section.setSize(size);
uint32_t offset = 0;
SectionData::iterator frag, fragEnd = m_pSectionData->end();
for (frag = m_pSectionData->begin(); frag != fragEnd; ++frag) {
frag->setOffset(offset);
offset += frag->size();
}
}
ARMPLT1* ARMPLT::create()
{
ARMPLT1* plt1_entry = new (std::nothrow) ARMPLT1(*m_pSectionData);
if (!plt1_entry)
fatal(diag::fail_allocate_memory_plt);
return plt1_entry;
}
void ARMPLT::applyPLT0()
{
uint64_t plt_base = m_Section.addr();
assert(plt_base && ".plt base address is NULL!");
uint64_t got_base = m_GOT.addr();
assert(got_base && ".got base address is NULL!");
uint32_t offset = 0;
if (got_base > plt_base)
offset = got_base - (plt_base + 16);
else
offset = (plt_base + 16) - got_base;
iterator first = m_pSectionData->getFragmentList().begin();
assert(first != m_pSectionData->getFragmentList().end() &&
"FragmentList is empty, applyPLT0 failed!");
ARMPLT0* plt0 = &(llvm::cast<ARMPLT0>(*first));
uint32_t* data = 0;
data = static_cast<uint32_t*>(malloc(ARMPLT0::EntrySize));
if (!data)
fatal(diag::fail_allocate_memory_plt);
memcpy(data, arm_plt0, ARMPLT0::EntrySize);
data[4] = offset;
plt0->setValue(reinterpret_cast<unsigned char*>(data));
}
void ARMPLT::applyPLT1()
{
uint64_t plt_base = m_Section.addr();
assert(plt_base && ".plt base address is NULL!");
uint64_t got_base = m_GOT.addr();
assert(got_base && ".got base address is NULL!");
ARMPLT::iterator it = m_pSectionData->begin();
ARMPLT::iterator ie = m_pSectionData->end();
assert(it != ie && "FragmentList is empty, applyPLT1 failed!");
uint32_t GOTEntrySize = ARMGOTEntry::EntrySize;
uint32_t GOTEntryAddress =
got_base + GOTEntrySize * 3;
uint64_t PLTEntryAddress =
plt_base + ARMPLT0::EntrySize; //Offset of PLT0
++it; //skip PLT0
uint64_t PLT1EntrySize = ARMPLT1::EntrySize;
ARMPLT1* plt1 = NULL;
uint32_t* Out = NULL;
while (it != ie) {
plt1 = &(llvm::cast<ARMPLT1>(*it));
Out = static_cast<uint32_t*>(malloc(ARMPLT1::EntrySize));
if (!Out)
fatal(diag::fail_allocate_memory_plt);
// Offset is the distance between the last PLT entry and the associated
// GOT entry.
int32_t Offset = (GOTEntryAddress - (PLTEntryAddress + 8));
Out[0] = arm_plt1[0] | ((Offset >> 20) & 0xFF);
Out[1] = arm_plt1[1] | ((Offset >> 12) & 0xFF);
Out[2] = arm_plt1[2] | (Offset & 0xFFF);
plt1->setValue(reinterpret_cast<unsigned char*>(Out));
++it;
GOTEntryAddress += GOTEntrySize;
PLTEntryAddress += PLT1EntrySize;
}
m_GOT.applyGOTPLT(plt_base);
}
uint64_t ARMPLT::emit(MemoryRegion& pRegion)
{
uint64_t result = 0x0;
iterator it = begin();
unsigned char* buffer = pRegion.begin();
memcpy(buffer, llvm::cast<ARMPLT0>((*it)).getValue(), ARMPLT0::EntrySize);
result += ARMPLT0::EntrySize;
++it;
ARMPLT1* plt1 = 0;
ARMPLT::iterator ie = end();
while (it != ie) {
plt1 = &(llvm::cast<ARMPLT1>(*it));
memcpy(buffer + result, plt1->getValue(), ARMPLT1::EntrySize);
result += ARMPLT1::EntrySize;
++it;
}
return result;
}
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