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350 lines
7.5 KiB
C++
350 lines
7.5 KiB
C++
/*====================================================================
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filename: disassemble.cpp
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project: GameCube DSP Tool (gcdsp)
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created: 2005.03.04
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mail: duddie@walla.com
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Copyright (c) 2005 Duddie
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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====================================================================*/
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#include <algorithm>
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#include <cstdlib>
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#include <fstream>
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#include <string>
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#include "Common/Common.h"
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#include "Common/FileUtil.h"
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#include "Common/StringUtil.h"
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#include "Core/DSP/DSPDisassembler.h"
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#include "Core/DSP/DSPTables.h"
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DSPDisassembler::DSPDisassembler(const AssemblerSettings &settings)
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: settings_(settings)
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{
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}
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DSPDisassembler::~DSPDisassembler()
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{
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// Some old code for logging unknown ops.
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std::string filename = File::GetUserPath(D_DUMPDSP_IDX) + "UnkOps.txt";
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std::ofstream uo(filename);
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if (!uo)
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return;
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int count = 0;
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for (const auto& entry : unk_opcodes)
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{
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if (entry.second > 0)
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{
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count++;
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uo << StringFromFormat("OP%04x\t%d", entry.first, entry.second);
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for (int j = 15; j >= 0; j--) // print op bits
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{
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if ((j & 0x3) == 3)
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uo << "\tb";
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uo << StringFromFormat("%d", (entry.first >> j) & 0x1);
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}
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uo << "\n";
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}
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}
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uo << StringFromFormat("Unknown opcodes count: %d\n", count);
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}
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bool DSPDisassembler::Disassemble(int start_pc, const std::vector<u16> &code, int base_addr, std::string &text)
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{
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const char *tmp1 = "tmp1.bin";
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// First we have to dump the code to a bin file.
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{
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File::IOFile f(tmp1, "wb");
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f.WriteArray(&code[0], code.size());
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}
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// Run the two passes.
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return DisassembleFile(tmp1, base_addr, 1, text) && DisassembleFile(tmp1, base_addr, 2, text);
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}
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std::string DSPDisassembler::DisassembleParameters(const DSPOPCTemplate& opc, u16 op1, u16 op2)
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{
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std::string buf;
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for (int j = 0; j < opc.param_count; j++)
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{
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if (j > 0)
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buf += ", ";
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u32 val = (opc.params[j].loc >= 1) ? op2 : op1;
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val &= opc.params[j].mask;
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if (opc.params[j].lshift < 0)
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val = val << (-opc.params[j].lshift);
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else
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val = val >> opc.params[j].lshift;
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u32 type = opc.params[j].type;
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if ((type & 0xff) == 0x10)
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type &= 0xff00;
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if (type & P_REG)
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{
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// Check for _D parameter - if so flip.
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if ((type == P_ACC_D) || (type == P_ACCM_D)) // Used to be P_ACCM_D TODO verify
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val = (~val & 0x1) | ((type & P_REGS_MASK) >> 8);
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else
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val |= (type & P_REGS_MASK) >> 8;
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type &= ~P_REGS_MASK;
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}
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switch (type)
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{
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case P_REG:
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if (settings_.decode_registers)
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buf += StringFromFormat("$%s", pdregname(val));
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else
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buf += StringFromFormat("$%d", val);
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break;
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case P_PRG:
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if (settings_.decode_registers)
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buf += StringFromFormat("@$%s", pdregname(val));
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else
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buf += StringFromFormat("@$%d", val);
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break;
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case P_VAL:
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case P_ADDR_I:
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case P_ADDR_D:
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if (settings_.decode_names)
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{
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buf += pdname(val);
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}
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else
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{
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buf += StringFromFormat("0x%04x", val);
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}
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break;
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case P_IMM:
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if (opc.params[j].size != 2)
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{
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if (opc.params[j].mask == 0x003f) // LSL, LSR, ASL, ASR
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buf += StringFromFormat("#%d", (val & 0x20) ? (val | 0xFFFFFFC0) : val); // 6-bit sign extension
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else
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buf += StringFromFormat("#0x%02x", val);
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}
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else
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{
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buf += StringFromFormat("#0x%04x", val);
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}
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break;
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case P_MEM:
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if (opc.params[j].size != 2)
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val = (u16)(s16)(s8)val;
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if (settings_.decode_names)
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buf += StringFromFormat("@%s", pdname(val));
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else
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buf += StringFromFormat("@0x%04x", val);
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break;
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default:
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ERROR_LOG(DSPLLE, "Unknown parameter type: %x", opc.params[j].type);
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break;
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}
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}
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return buf;
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}
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static std::string MakeLowerCase(std::string in)
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{
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std::transform(in.begin(), in.end(), in.begin(), ::tolower);
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return in;
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}
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bool DSPDisassembler::DisassembleOpcode(const u16 *binbuf, int base_addr, int pass, u16 *pc, std::string &dest)
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{
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std::string buf(" ");
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if ((*pc & 0x7fff) >= 0x1000)
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{
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++pc;
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dest.append("; outside memory");
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return false;
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}
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const u32 op1 = binbuf[*pc & 0x0fff];
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const DSPOPCTemplate *opc = nullptr;
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const DSPOPCTemplate *opc_ext = nullptr;
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// find opcode
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for (int j = 0; j < opcodes_size; j++)
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{
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u16 mask = opcodes[j].opcode_mask;
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if ((op1 & mask) == opcodes[j].opcode)
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{
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opc = &opcodes[j];
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break;
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}
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}
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const DSPOPCTemplate fake_op = {"CW", 0x0000, 0x0000, nop, nullptr, 1, 1, {{P_VAL, 2, 0, 0, 0xffff}}, false, false, false, false, false};
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if (!opc)
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opc = &fake_op;
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bool extended = false;
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bool only7bitext = false;
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if (((opc->opcode >> 12) == 0x3) && (op1 & 0x007f))
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{
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extended = true;
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only7bitext = true;
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}
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else if (((opc->opcode >> 12) > 0x3) && (op1 & 0x00ff))
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{
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extended = true;
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}
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if (extended)
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{
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// opcode has an extension
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// find opcode
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for (int j = 0; j < opcodes_ext_size; j++)
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{
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if (only7bitext)
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{
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if (((op1 & 0x7f) & opcodes_ext[j].opcode_mask) == opcodes_ext[j].opcode)
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{
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opc_ext = &opcodes_ext[j];
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break;
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}
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}
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else
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{
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if ((op1 & opcodes_ext[j].opcode_mask) == opcodes_ext[j].opcode)
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{
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opc_ext = &opcodes_ext[j];
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break;
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}
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}
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}
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}
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// printing
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if (settings_.show_pc)
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buf += StringFromFormat("%04x ", *pc);
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u32 op2;
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// Size 2 - the op has a large immediate.
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if (opc->size == 2)
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{
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op2 = binbuf[(*pc + 1) & 0x0fff];
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if (settings_.show_hex)
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buf += StringFromFormat("%04x %04x ", op1, op2);
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}
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else
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{
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op2 = 0;
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if (settings_.show_hex)
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buf += StringFromFormat("%04x ", op1);
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}
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std::string opname = opc->name;
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if (settings_.lower_case_ops)
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opname = MakeLowerCase(opname);
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std::string ext_buf;
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if (extended)
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ext_buf = StringFromFormat("%s%c%s", opname.c_str(), settings_.ext_separator, opc_ext->name);
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else
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ext_buf = opname;
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if (settings_.lower_case_ops)
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ext_buf = MakeLowerCase(ext_buf);
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if (settings_.print_tabs)
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buf += StringFromFormat("%s\t", ext_buf.c_str());
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else
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buf += StringFromFormat("%-12s", ext_buf.c_str());
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if (opc->param_count > 0)
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buf += DisassembleParameters(*opc, op1, op2);
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// Handle opcode extension.
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if (extended)
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{
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if (opc->param_count > 0)
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buf += " ";
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buf += ": ";
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if (opc_ext->param_count > 0)
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buf += DisassembleParameters(*opc_ext, op1, op2);
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}
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if (opc->opcode_mask == 0)
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{
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// unknown opcode
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unk_opcodes[op1]++;
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buf += "\t\t; *** UNKNOWN OPCODE ***";
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}
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if (extended)
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*pc += opc_ext->size;
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else
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*pc += opc->size;
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if (pass == 2)
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dest.append(buf);
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return true;
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}
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bool DSPDisassembler::DisassembleFile(const std::string& name, int base_addr, int pass, std::string &output)
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{
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File::IOFile in(name, "rb");
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if (!in)
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{
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printf("gd_dis_file: No input\n");
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return false;
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}
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const int size = ((int)in.GetSize() & ~1) / 2;
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std::vector<u16> binbuf(size);
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in.ReadArray(binbuf.data(), size);
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in.Close();
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// Actually do the disassembly.
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for (u16 pc = 0; pc < size;)
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{
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DisassembleOpcode(binbuf.data(), base_addr, pass, &pc, output);
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if (pass == 2)
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output.append("\n");
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}
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return true;
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}
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