SgAsmx86Instruction* SageBuilderAsm::buildx86Instruction( X86InstructionKind kind )
{
// These are the default values used for the construction of new instructions.
rose_addr_t address = 0;
string mnemonic = "";
X86InstructionSize baseSize = x86_insnsize_none;
X86InstructionSize operandSize = x86_insnsize_none;
X86InstructionSize addressSize = x86_insnsize_none;
SgAsmx86Instruction* instruction = new SgAsmx86Instruction(address,mnemonic,kind,baseSize,operandSize,addressSize);
// This should not have been set yet.
ROSE_ASSERT(instruction->get_operandList() == NULL);
// All instructions are required to have a valid SgAsmOperandList pointer.
instruction->set_operandList(new SgAsmOperandList ());
// Set the parent in the SgAsmOperandList
instruction->get_operandList()->set_parent(instruction);
return instruction;
}
SgAsmInstruction*
SageBuilderAsm::buildMultibyteNopInstruction(int n)
{
// DQ (5/1/2010): Support for building multi-byte NOP instructions.
// this is x86 specific which is OK for now.
// SgAsmInstruction* instruction = NULL;
ROSE_ASSERT(n > 0);
ROSE_ASSERT(n <= 9);
uint64_t ip = 0; /* Virtual address for start of instruction */
std::string mnemonic = "nop";
X86InstructionKind kind = x86_nop;
X86InstructionSize insnSize = x86_insnsize_32; /* Default size of instructions, based on architecture; see init() */
X86InstructionSize effectiveOperandSize = x86_insnsize_32;
X86InstructionSize effectiveAddressSize = x86_insnsize_32;
bool lock = false;
X86RepeatPrefix repeatPrefix = x86_repeat_none;
bool branchPredictionEnabled = false;
X86BranchPrediction branchPrediction = x86_branch_prediction_none;
// SgUnsignedCharList insnbuf(0x90);
SgUnsignedCharList insnbuf;
size_t insnbufat = size_t(n); /* Index of next byte to be read from or write to insnbuf */
SgAsmx86Instruction *instruction = NULL;
instruction = new SgAsmx86Instruction(ip, mnemonic, kind, insnSize, effectiveOperandSize, effectiveAddressSize);
ROSE_ASSERT(instruction != NULL);
// Here we are building a simpler version of multi-byte nop using repeated prefixes.
for (int i = 1; i < n; i++)
{
insnbuf.push_back(0x66);
}
insnbuf.push_back(0x90);
#if 0
// This switch will implement proper multi-byte NOPs (not implemented yet).
switch(n)
{
case 1:
{
// instruction->set_raw_bytes(SgUnsignedCharList(&(insnbuf[0]), &(insnbuf[0])+insnbufat));
insnbuf.push_front(0x66);
break;
}
// case 2: instruction = makeInstruction(x86_nop, "nop", modrm); break;
default:
{
printf ("Error: SageBuilderAsm::buildMultibyteNopInstruction(n=%d) not supported \n",n);
ROSE_ASSERT(false);
}
}
#endif
instruction->set_raw_bytes(SgUnsignedCharList(&(insnbuf[0]), &(insnbuf[0])+insnbufat));
ROSE_ASSERT(instruction != NULL);
instruction->set_lockPrefix(lock);
instruction->set_repeatPrefix(repeatPrefix);
if (branchPredictionEnabled)
instruction->set_branchPrediction(branchPrediction);
SgAsmOperandList *operands = new SgAsmOperandList();
instruction->set_operandList(operands);
operands->set_parent(instruction);
return instruction;
}