343 lines
6.6 KiB
C++
343 lines
6.6 KiB
C++
/*====================================================================
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filename: gdsp_interpreter.cpp
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project: GCemu
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created: 2004-6-18
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mail: duddie@walla.com
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Copyright (c) 2005 Duddie & Tratax
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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====================================================================*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "gdsp_interface.h"
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#include "gdsp_opcodes_helper.h"
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#include "Tools.h"
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//-------------------------------------------------------------------------------
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SDSP g_dsp;
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uint16 SDSP::r[32];
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uint16 SDSP::pc = 0;
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uint16 SDSP::err_pc = 0;
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uint16* SDSP::iram = 0;
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uint16* SDSP::dram = 0;
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uint16* SDSP::irom = 0;
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uint16* SDSP::drom = 0;
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uint16* SDSP::coef = 0;
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uint8* SDSP::cpu_ram = 0;
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uint16 SDSP::cr = 0;
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uint8 SDSP::reg_stack_ptr[4];
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// lets make stack depth to 32 for now
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uint16 SDSP::reg_stack[4][DSP_STACK_DEPTH];
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void (*SDSP::irq_request)() = NULL;
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bool SDSP::exception_in_progress_hack = false;
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// for debugger only
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uint32 SDSP::iram_crc = 0;
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uint64 SDSP::step_counter = 0;
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//-------------------------------------------------------------------------------
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static bool CR_HALT = true;
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static bool CR_EXTERNAL_INT = false;
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void UpdateCachedCR()
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{
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CR_HALT = (g_dsp.cr & 0x4) != 0;
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CR_EXTERNAL_INT = (g_dsp.cr & 0x02) != 0;
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}
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//-------------------------------------------------------------------------------
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void (*dsp_op[])(uint16 opc) =
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{
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dsp_op0, dsp_op1, dsp_op2, dsp_op3,
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dsp_op4, dsp_op5, dsp_op6, dsp_op7,
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dsp_op8, dsp_op9, dsp_opab, dsp_opab,
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dsp_opcd, dsp_opcd, dsp_ope, dsp_opf,
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};
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void dbg_error(char* err_msg)
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{
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return;
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}
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void gdsp_init()
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{
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g_dsp.irom = (uint16*)malloc(DSP_IROM_SIZE * sizeof(uint16));
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g_dsp.iram = (uint16*)malloc(DSP_IRAM_SIZE * sizeof(uint16));
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g_dsp.drom = (uint16*)malloc(DSP_DROM_SIZE * sizeof(uint16));
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g_dsp.dram = (uint16*)malloc(DSP_DRAM_SIZE * sizeof(uint16));
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g_dsp.coef = (uint16*)malloc(DSP_COEF_SIZE * sizeof(uint16));
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for (int i = 0; i < DSP_IRAM_SIZE; i++)
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{
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g_dsp.iram[i] = 0x0021; // HALT opcode
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}
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for (int i = 0; i < DSP_DRAM_SIZE; i++)
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{
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g_dsp.dram[i] = 0x0021; // HALT opcode
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}
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for (int i = 0; i < 32; i++)
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{
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g_dsp.r[i] = 0;
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}
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for (int i = 0; i < 4; i++)
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{
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g_dsp.reg_stack_ptr[i] = 0;
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for (int j = 0; j < DSP_STACK_DEPTH; j++)
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{
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g_dsp.reg_stack[i][j] = 0;
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}
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}
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// copied from a real console after the custom UCode has been loaded
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g_dsp.r[0x08] = 0xffff;
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g_dsp.r[0x09] = 0xffff;
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g_dsp.r[0x0a] = 0xffff;
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g_dsp.r[0x0b] = 0xffff;
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g_dsp.cr = 0x804;
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gdsp_ifx_init();
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UpdateCachedCR();
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}
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void gdsp_reset()
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{
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// _dbg_assert_msg_(0, "gdsp_reset()");
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_dbg_assert_msg_(!g_dsp.exception_in_progress_hack, "assert while exception");
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g_dsp.pc = DSP_RESET_VECTOR;
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g_dsp.exception_in_progress_hack = false;
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}
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void gdsp_generate_exception(uint8 level)
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{
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_dbg_assert_msg_(!g_dsp.exception_in_progress_hack, "assert while exception");
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dsp_reg_store_stack(DSP_STACK_C, g_dsp.pc);
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dsp_reg_store_stack(DSP_STACK_D, g_dsp.r[R_SR]);
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g_dsp.pc = level * 2;
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g_dsp.exception_in_progress_hack = true;
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}
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uint32 gdsp_exception_ready = 0;
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void gdsp_exception(uint8 level)
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{
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switch (level & 0x7)
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{
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case 0x5: // ACCA > ACCH exception
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if (g_dsp.r[R_SR] & 0x200)
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{
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gdsp_exception_ready = level;
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}
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break;
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default:
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break;
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}
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}
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bool gdsp_load_rom(char* fname)
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{
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FILE* pFile = fopen(fname, "rb");
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if (pFile)
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{
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fread(g_dsp.irom, 1, DSP_IRAM_SIZE, pFile);
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fclose(pFile);
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return(true);
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}
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return(false);
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}
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bool gdsp_load_coef(char* fname)
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{
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FILE* pFile = fopen(fname, "rb");
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if (pFile)
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{
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fread(g_dsp.coef, 1, DSP_COEF_SIZE, pFile);
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fclose(pFile);
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return(true);
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}
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return(false);
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}
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void gdsp_write_cr(uint16 val)
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{
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// reset
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if (val & 0x0001)
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{
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gdsp_reset();
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}
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val &= ~0x0001;
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// update cr
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g_dsp.cr = val;
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UpdateCachedCR();
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}
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uint16 gdsp_read_cr()
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{
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if (g_dsp.pc & 0x8000)
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{
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g_dsp.cr |= 0x800;
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}
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else
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{
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g_dsp.cr &= ~0x800;
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}
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UpdateCachedCR();
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return(g_dsp.cr);
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}
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// special loop step.. because exception in loop or loopi fails
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// dunno how we have to fix it
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// atm we execute this instructions directly inside the loop command
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// so it cant be interrupted by an exception
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void gdsp_loop_step()
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{
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g_dsp.err_pc = g_dsp.pc;
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uint16 opc = dsp_fetch_code();
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dsp_op[opc >> 12](opc);
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}
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void gdsp_step()
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{
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g_dsp.step_counter++;
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g_dsp.err_pc = g_dsp.pc;
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uint16 opc = dsp_fetch_code();
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dsp_op[opc >> 12](opc);
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uint16& rLoopCounter = g_dsp.r[DSP_REG_ST0 + 3];
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if (rLoopCounter > 0)
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{
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const uint16& rCallAddress = g_dsp.r[DSP_REG_ST0 + 0];
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const uint16& rLoopAddress = g_dsp.r[DSP_REG_ST0 + 2];
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if (g_dsp.pc == (rLoopAddress + 1))
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{
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rLoopCounter--;
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if (rLoopCounter > 0)
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{
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g_dsp.pc = rCallAddress;
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}
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else
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{
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// end of loop
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dsp_reg_load_stack(0);
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dsp_reg_load_stack(2);
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dsp_reg_load_stack(3);
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}
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}
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}
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// check if there is an external interrupt
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if (CR_EXTERNAL_INT)
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{
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if (dsp_SR_is_flag_set(FLAG_ENABLE_INTERUPT) && (g_dsp.exception_in_progress_hack == false))
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{
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gdsp_generate_exception(7);
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g_dsp.cr &= ~0x0002;
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UpdateCachedCR();
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}
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// level 7 is the interrupt exception
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gdsp_exception_ready = 7;
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}
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}
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bool gdsp_running;
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extern volatile uint32 dsp_running;
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bool gdsp_run()
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{
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gdsp_running = true;
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while (!CR_HALT)
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{
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gdsp_step();
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}
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gdsp_running = false;
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return(true);
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}
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bool gdsp_runx(uint16 cnt)
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{
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gdsp_running = true;
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while (!(g_dsp.cr & 0x4) && gdsp_running)
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{
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gdsp_step();
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cnt--;
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if (cnt == 0)
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{
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break;
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}
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}
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gdsp_running = false;
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return(true);
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}
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void gdsp_stop()
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{
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gdsp_running = false;
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}
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