dolphin/Source/Core/DSPCore/Src/disassemble.cpp

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/*====================================================================
filename: disassemble.cpp
project: GameCube DSP Tool (gcdsp)
created: 2005.03.04
mail: duddie@walla.com
Copyright (c) 2005 Duddie
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
====================================================================*/
#include <stdio.h>
#include <stdlib.h>
#include "FileUtil.h"
#include "disassemble.h"
#include "DSPTables.h"
#ifdef _MSC_VER
#pragma warning(disable:4996)
#endif
extern void nop(const UDSPInstruction& opc);
DSPDisassembler::DSPDisassembler(const AssemblerSettings &settings)
: settings_(settings)
{
}
DSPDisassembler::~DSPDisassembler()
{
// Some old code for logging unknown ops.
char filename[MAX_PATH];
sprintf(filename, "%sUnkOps.txt", FULL_DSP_DUMP_DIR);
FILE *uo = fopen(filename, "w");
if (!uo)
return;
int count = 0;
for (std::map<u16, int>::const_iterator iter = unk_opcodes.begin();
iter != unk_opcodes.end(); ++iter)
{
if (iter->second > 0)
{
count++;
fprintf(uo, "OP%04x\t%d", iter->first, iter->second);
for (int j = 15; j >= 0; j--) // print op bits
{
if ((j & 0x3) == 3)
fprintf(uo, "\tb");
fprintf(uo, "%d", (iter->first >> j) & 0x1);
}
fprintf(uo, "\n");
}
}
fprintf(uo, "Unknown opcodes count: %d\n", count);
fclose(uo);
}
bool DSPDisassembler::Disassemble(int start_pc, const std::vector<u16> &code, int base_addr, std::string &text)
{
const char *tmp1 = "tmp1.bin";
const char *tmp2 = "tmp.txt";
// First we have to dump the code to a bin file.
FILE *f = fopen(tmp1, "wb");
fwrite(&code[0], 1, code.size() * 2, f);
fclose(f);
// Run the two passes.
return DisFile(tmp1, 1, text) && DisFile(tmp1, 2, text);
}
char *DSPDisassembler::DisParams(const DSPOPCTemplate& opc, u16 op1, u16 op2, char *strbuf)
{
char *buf = strbuf;
for (int j = 0; j < opc.param_count; j++)
{
if (j > 0)
buf += sprintf(buf, ", ");
u32 val = (opc.params[j].loc >= 1) ? val = op2 : val = op1;
val &= opc.params[j].mask;
if (opc.params[j].lshift < 0)
val = val << (-opc.params[j].lshift);
else
val = val >> opc.params[j].lshift;
u32 type = opc.params[j].type;
if ((type & 0xff) == 0x10)
type &= 0xff00;
if (type & P_REG)
{
// Check for _D parameter - if so flip.
if (type == P_ACC_D) // Used to be P_ACCM_D TODO verify
val = (~val & 0x1) | ((type & P_REGS_MASK) >> 8);
else
val |= (type & P_REGS_MASK) >> 8;
type &= ~P_REGS_MASK;
}
switch (type)
{
case P_REG:
if (settings_.decode_registers)
sprintf(buf, "$%s", pdregname(val));
else
sprintf(buf, "$%d", val);
break;
case P_PRG:
if (settings_.decode_registers)
sprintf(buf, "@$%s", pdregname(val));
else
sprintf(buf, "@$%d", val);
break;
case P_VAL:
case P_ADDR_I:
case P_ADDR_D:
if (settings_.decode_names)
{
sprintf(buf, "%s", pdname(val));
}
else
sprintf(buf, "0x%04x", val);
break;
case P_IMM:
if (opc.params[j].size != 2)
{
if (opc.params[j].mask == 0x003f) // LSL, LSR, ASL, ASR
sprintf(buf, "#%d", (val & 0x20) ? (val | 0xFFFFFFC0) : val); // 6-bit sign extension
else
sprintf(buf, "#0x%02x", val);
}
else
{
sprintf(buf, "#0x%04x", val);
}
break;
case P_MEM:
if (opc.params[j].size != 2)
val = (u16)(s16)(s8)val;
if (settings_.decode_names)
sprintf(buf, "@%s", pdname(val));
else
sprintf(buf, "@0x%04x", val);
break;
default:
ERROR_LOG(DSPLLE, "Unknown parameter type: %x", opc.params[j].type);
break;
}
buf += strlen(buf);
}
return strbuf;
}
static void MakeLowerCase(char *ptr)
{
int i = 0;
while (ptr[i])
{
ptr[i] = tolower(ptr[i]);
i++;
}
}
void DSPDisassembler::DisOpcode(const u16 *binbuf, int base_addr, int pass, u16 *pc, std::string &dest)
{
char buffer[256];
char *buf = buffer;
// Start with 8 spaces, if there's no label.
buf[0] = ' ';
buf[1] = '\0';
buf++;
if ((*pc & 0x7fff) >= 0x1000)
{
*pc++;
dest.append("; outside memory");
return;
}
*pc &= 0x0fff;
const u32 op1 = binbuf[*pc];
const DSPOPCTemplate *opc = NULL;
const DSPOPCTemplate *opc_ext = NULL;
// find opcode
for (int j = 0; j < opcodes_size; j++)
{
u16 mask;
if (opcodes[j].size & P_EXT)
mask = opcodes[j].opcode_mask & 0xff00;
else
mask = opcodes[j].opcode_mask;
if ((op1 & mask) == opcodes[j].opcode)
{
opc = &opcodes[j];
break;
}
}
const DSPOPCTemplate fake_op = {"CW", 0x0000, 0x0000, nop, nop, 1, 1, {{P_VAL, 2, 0, 0, 0xffff}}, NULL, NULL,};
if (!opc)
opc = &fake_op;
bool extended;
if ((opc->size & P_EXT) && (op1 & 0x00ff))
extended = true;
else
extended = false;
if (extended)
{
// opcode has an extension
// find opcode
for (int j = 0; j < opcodes_ext_size; j++)
{
if ((op1 & opcodes_ext[j].opcode_mask) == opcodes_ext[j].opcode)
{
opc_ext = &opcodes_ext[j];
break;
}
}
}
// printing
if (settings_.show_pc)
buf += sprintf(buf, "%04x ", *pc);
u32 op2;
// Size 2 - the op has a large immediate.
if ((opc->size & ~P_EXT) == 2)
{
op2 = binbuf[*pc + 1];
if (settings_.show_hex)
buf += sprintf(buf, "%04x %04x ", op1, op2);
}
else
{
op2 = 0;
if (settings_.show_hex)
buf += sprintf(buf, "%04x ", op1);
}
char opname[20];
strcpy(opname, opc->name);
if (settings_.lower_case_ops)
MakeLowerCase(opname);
char ext_buf[20];
if (extended)
sprintf(ext_buf, "%s%c%s", opname, settings_.ext_separator, opc_ext->name);
else
sprintf(ext_buf, "%s", opname);
if (settings_.lower_case_ops)
MakeLowerCase(ext_buf);
if (settings_.print_tabs)
buf += sprintf(buf, "%s\t", ext_buf);
else
buf += sprintf(buf, "%-12s", ext_buf);
if (opc->param_count > 0)
DisParams(*opc, op1, op2, buf);
buf += strlen(buf);
// Handle opcode extension.
if (extended)
{
if (opc->param_count > 0)
buf += sprintf(buf, " ");
buf += sprintf(buf, ": ");
if (opc_ext->param_count > 0)
DisParams(*opc_ext, op1, op2, buf);
buf += strlen(buf);
}
if (opc->opcode_mask == 0)
{
// unknown opcode
unk_opcodes[op1]++;
sprintf(buf, "\t\t; *** UNKNOWN OPCODE ***");
}
if (extended)
*pc += opc_ext->size;
else
*pc += opc->size & ~P_EXT;
if (pass == 2)
dest.append(buffer);
}
bool DSPDisassembler::DisFile(const char* name, int pass, std::string &output)
{
FILE* in = fopen(name, "rb");
if (in == NULL)
{
printf("gd_dis_file: No input\n");
return false;
}
fseek(in, 0, SEEK_END);
int size = (int)ftell(in) & ~1;
fseek(in, 0, SEEK_SET);
u16 *binbuf = new u16[size / 2];
fread(binbuf, 1, size, in);
fclose(in);
// Actually do the disassembly.
for (u16 pc = 0; pc < (size / 2);)
{
DisOpcode(binbuf, 0x0000, pass, &pc, output);
if (pass == 2)
output.append("\n");
}
delete [] binbuf;
return true;
}