analy_ppc.cc

功能较全面的反汇编器：反汇编器ht-2.0.15.tar.gz

/* 
 *	HT Editor
 *	analy_ppc.cc
 *
 *	Copyright (C) 1999-2002 Sebastian Biallas ([e-mail])
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License version 2 as
 *	published by the Free Software Foundation.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <string.h>

#include "analy_ppc.h"
#include "analy_register.h"
#include "ppcdis.h"
#include "htiobox.h"
#include "snprintf.h"

void AnalyPPCDisassembler::init(Analyser *A, int aMode)
{
	mode = aMode;
	disasm = new PPCDisassembler((aMode == ANALY_PPC_32) ? PPC_MODE_32 : PPC_MODE_64);
	AnalyDisassembler::init(A);
}

void AnalyPPCDisassembler::load(ObjectStream &f)
{
	GET_INT32X(f, mode);
	AnalyDisassembler::load(f);
}

/*
 *
 */
void AnalyPPCDisassembler::done()
{
	AnalyDisassembler::done();
}

ObjectID AnalyPPCDisassembler::getObjectID() const
{
	return ATOM_ANALY_PPC;
}

/*
 *
 */
Address *AnalyPPCDisassembler::branchAddr(OPCODE *opcode, branch_enum_t branchtype, bool examine)
{
	Address *a;
	a = createAddress(((ppcdis_insn *)opcode)->op[((ppcdis_insn *)opcode)->ops-1].rel.mem);
	if (/*examine &&*/ analy->validAddress(a, scvalid)) {
		return a;
	}
	delete a;
	return new InvalidAddress();
}

Address *AnalyPPCDisassembler::createAddress(uint64 offset)
{
	if (mode == ANALY_PPC_32) {
		return new AddressFlat32(offset);
	} else {
		return new AddressFlat64(offset);
	}
}

/*
 *
 */
void AnalyPPCDisassembler::examineOpcode(OPCODE *opcode)
{
}

/*
 *
 */
branch_enum_t AnalyPPCDisassembler::isBranch(OPCODE *opcode)
{
	// FIXME: needs work!!
	ppcdis_insn *ppc_insn = (ppcdis_insn *) opcode;
	if (ppc_insn->name[0]=='b') {
		if (ppc_insn->name[1]=='l') {
			if (ppc_insn->name[2]==0) {
				return br_call;
			}
			if (ppc_insn->name[2]=='r') {
				if (ppc_insn->name[3]=='l') {
					return br_call;
				} else {
					return br_return;
				}
			}
			return br_jXX;
		}
		if (ppc_insn->name[strlen(ppc_insn->name)] == 'l') {
				return br_call;
		}
		if (ppc_insn->name[1] == 0 || strcmp(ppc_insn->name, "bctr") == 0) {
				return br_jump;
		}
		return br_jXX;
	}
	return br_nobranch;
}

void AnalyPPCDisassembler::store(ObjectStream &f) const
{
	PUT_INT32X(f, mode);
	AnalyDisassembler::store(f);
}