mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
449 lines
12 KiB
C
449 lines
12 KiB
C
/*
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* PicoDrive
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* (c) Copyright Dave, 2004
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* (C) notaz, 2006-2009
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*
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* This work is licensed under the terms of MAME license.
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* See COPYING file in the top-level directory.
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*/
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#include "pico_int.h"
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#include "memory.h"
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int SekCycleCnt=0; // cycles done in this frame
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int SekCycleAim=0; // cycle aim
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unsigned int SekCycleCntT=0;
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/* context */
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// Cyclone 68000
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#ifdef EMU_C68K
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struct Cyclone PicoCpuCM68k;
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#endif
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// MUSASHI 68000
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#ifdef EMU_M68K
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m68ki_cpu_core PicoCpuMM68k;
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#endif
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// FAME 68000
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#ifdef EMU_F68K
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M68K_CONTEXT PicoCpuFM68k;
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#endif
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/* callbacks */
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#ifdef EMU_C68K
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// interrupt acknowledgment
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static int SekIntAck(int level)
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{
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// try to emulate VDP's reaction to 68000 int ack
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if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%i]", SekPc, SekCycleCnt); }
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else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%i]", SekPc, SekCycleCnt); }
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PicoCpuCM68k.irq = 0;
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return CYCLONE_INT_ACK_AUTOVECTOR;
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}
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static void SekResetAck(void)
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{
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elprintf(EL_ANOMALY, "Reset encountered @ %06x", SekPc);
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}
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static int SekUnrecognizedOpcode()
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{
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unsigned int pc;
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pc = SekPc;
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elprintf(EL_ANOMALY, "Unrecognized Opcode @ %06x", pc);
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// see if we are still in a mapped region
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pc &= 0x00ffffff;
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if (map_flag_set(m68k_read16_map[pc >> M68K_MEM_SHIFT])) {
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elprintf(EL_STATUS|EL_ANOMALY, "m68k crash @%06x", pc);
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PicoCpuCM68k.cycles = 0;
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PicoCpuCM68k.state_flags |= 1;
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return 1;
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}
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#ifdef EMU_M68K // debugging cyclone
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{
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extern int have_illegal;
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have_illegal = 1;
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}
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#endif
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return 0;
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}
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#endif
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#ifdef EMU_M68K
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static int SekIntAckM68K(int level)
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{
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if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%i]", SekPc, SekCycleCnt); }
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else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%i]", SekPc, SekCycleCnt); }
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CPU_INT_LEVEL = 0;
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return M68K_INT_ACK_AUTOVECTOR;
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}
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static int SekTasCallback(void)
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{
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return 0; // no writeback
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}
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#endif
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#ifdef EMU_F68K
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static void SekIntAckF68K(unsigned level)
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{
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if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%i]", SekPc, SekCycleCnt); }
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else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%i]", SekPc, SekCycleCnt); }
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PicoCpuFM68k.interrupts[0] = 0;
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}
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#endif
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PICO_INTERNAL void SekInit(void)
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{
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#ifdef EMU_C68K
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CycloneInit();
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memset(&PicoCpuCM68k,0,sizeof(PicoCpuCM68k));
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PicoCpuCM68k.IrqCallback=SekIntAck;
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PicoCpuCM68k.ResetCallback=SekResetAck;
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PicoCpuCM68k.UnrecognizedCallback=SekUnrecognizedOpcode;
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PicoCpuCM68k.flags=4; // Z set
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#endif
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#ifdef EMU_M68K
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{
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void *oldcontext = m68ki_cpu_p;
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m68k_set_context(&PicoCpuMM68k);
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m68k_set_cpu_type(M68K_CPU_TYPE_68000);
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m68k_init();
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m68k_set_int_ack_callback(SekIntAckM68K);
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m68k_set_tas_instr_callback(SekTasCallback);
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//m68k_pulse_reset();
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m68k_set_context(oldcontext);
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}
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#endif
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#ifdef EMU_F68K
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{
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void *oldcontext = g_m68kcontext;
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g_m68kcontext = &PicoCpuFM68k;
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memset(&PicoCpuFM68k, 0, sizeof(PicoCpuFM68k));
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fm68k_init();
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PicoCpuFM68k.iack_handler = SekIntAckF68K;
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PicoCpuFM68k.sr = 0x2704; // Z flag
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g_m68kcontext = oldcontext;
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}
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#endif
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}
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// Reset the 68000:
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PICO_INTERNAL int SekReset(void)
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{
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if (Pico.rom==NULL) return 1;
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#ifdef EMU_C68K
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CycloneReset(&PicoCpuCM68k);
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#endif
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#ifdef EMU_M68K
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m68k_set_context(&PicoCpuMM68k); // if we ever reset m68k, we always need it's context to be set
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m68ki_cpu.sp[0]=0;
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m68k_set_irq(0);
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m68k_pulse_reset();
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REG_USP = 0; // ?
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#endif
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#ifdef EMU_F68K
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{
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g_m68kcontext = &PicoCpuFM68k;
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fm68k_reset();
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}
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#endif
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return 0;
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}
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void SekStepM68k(void)
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{
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SekCycleAim=SekCycleCnt+1;
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#if defined(EMU_CORE_DEBUG)
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SekCycleCnt+=CM_compareRun(1, 0);
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#elif defined(EMU_C68K)
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PicoCpuCM68k.cycles=1;
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CycloneRun(&PicoCpuCM68k);
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SekCycleCnt+=1-PicoCpuCM68k.cycles;
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#elif defined(EMU_M68K)
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SekCycleCnt+=m68k_execute(1);
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#elif defined(EMU_F68K)
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SekCycleCnt+=fm68k_emulate(1, 0, 0);
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#endif
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}
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PICO_INTERNAL void SekSetRealTAS(int use_real)
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{
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#ifdef EMU_C68K
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CycloneSetRealTAS(use_real);
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#endif
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#ifdef EMU_F68K
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// TODO
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#endif
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}
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// Pack the cpu into a common format:
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// XXX: rename
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PICO_INTERNAL void SekPackCpu(unsigned char *cpu, int is_sub)
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{
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unsigned int pc=0;
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#if defined(EMU_C68K)
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struct Cyclone *context = is_sub ? &PicoCpuCS68k : &PicoCpuCM68k;
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memcpy(cpu,context->d,0x40);
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pc=context->pc-context->membase;
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*(unsigned int *)(cpu+0x44)=CycloneGetSr(context);
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*(unsigned int *)(cpu+0x48)=context->osp;
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cpu[0x4c] = context->irq;
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cpu[0x4d] = context->state_flags & 1;
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#elif defined(EMU_M68K)
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void *oldcontext = m68ki_cpu_p;
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m68k_set_context(is_sub ? &PicoCpuMS68k : &PicoCpuMM68k);
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memcpy(cpu,m68ki_cpu_p->dar,0x40);
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pc=m68ki_cpu_p->pc;
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*(unsigned int *)(cpu+0x44)=m68k_get_reg(NULL, M68K_REG_SR);
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*(unsigned int *)(cpu+0x48)=m68ki_cpu_p->sp[m68ki_cpu_p->s_flag^SFLAG_SET];
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cpu[0x4c] = CPU_INT_LEVEL>>8;
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cpu[0x4d] = CPU_STOPPED;
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m68k_set_context(oldcontext);
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#elif defined(EMU_F68K)
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M68K_CONTEXT *context = is_sub ? &PicoCpuFS68k : &PicoCpuFM68k;
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memcpy(cpu,context->dreg,0x40);
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pc=context->pc;
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*(unsigned int *)(cpu+0x44)=context->sr;
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*(unsigned int *)(cpu+0x48)=context->asp;
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cpu[0x4c] = context->interrupts[0];
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cpu[0x4d] = (context->execinfo & FM68K_HALTED) ? 1 : 0;
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#endif
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*(unsigned int *)(cpu+0x40) = pc;
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*(unsigned int *)(cpu+0x50) = SekCycleCntT;
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}
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PICO_INTERNAL void SekUnpackCpu(const unsigned char *cpu, int is_sub)
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{
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#if defined(EMU_C68K)
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struct Cyclone *context = is_sub ? &PicoCpuCS68k : &PicoCpuCM68k;
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CycloneSetSr(context, *(unsigned int *)(cpu+0x44));
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context->osp=*(unsigned int *)(cpu+0x48);
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memcpy(context->d,cpu,0x40);
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context->membase = 0;
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context->pc = *(unsigned int *)(cpu+0x40);
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CycloneUnpack(context, NULL); // rebase PC
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context->irq = cpu[0x4c];
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context->state_flags = 0;
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if (cpu[0x4d])
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context->state_flags |= 1;
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#elif defined(EMU_M68K)
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void *oldcontext = m68ki_cpu_p;
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m68k_set_context(is_sub ? &PicoCpuMS68k : &PicoCpuMM68k);
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m68k_set_reg(M68K_REG_SR, *(unsigned int *)(cpu+0x44));
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memcpy(m68ki_cpu_p->dar,cpu,0x40);
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m68ki_cpu_p->pc=*(unsigned int *)(cpu+0x40);
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m68ki_cpu_p->sp[m68ki_cpu_p->s_flag^SFLAG_SET]=*(unsigned int *)(cpu+0x48);
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CPU_INT_LEVEL = cpu[0x4c] << 8;
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CPU_STOPPED = cpu[0x4d];
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m68k_set_context(oldcontext);
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#elif defined(EMU_F68K)
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M68K_CONTEXT *context = is_sub ? &PicoCpuFS68k : &PicoCpuFM68k;
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memcpy(context->dreg,cpu,0x40);
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context->pc =*(unsigned int *)(cpu+0x40);
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context->sr =*(unsigned int *)(cpu+0x44);
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context->asp=*(unsigned int *)(cpu+0x48);
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context->interrupts[0] = cpu[0x4c];
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context->execinfo &= ~FM68K_HALTED;
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if (cpu[0x4d]&1) context->execinfo |= FM68K_HALTED;
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#endif
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SekCycleCntT = *(unsigned int *)(cpu+0x50);
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}
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/* idle loop detection, not to be used in CD mode */
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#ifdef EMU_C68K
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#include "cpu/cyclone/tools/idle.h"
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#endif
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static unsigned short **idledet_ptrs = NULL;
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static int idledet_count = 0, idledet_bads = 0;
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int idledet_start_frame = 0;
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#if 0
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#define IDLE_STATS 1
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unsigned int idlehit_addrs[128], idlehit_counts[128];
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void SekRegisterIdleHit(unsigned int pc)
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{
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int i;
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for (i = 0; i < 127 && idlehit_addrs[i]; i++) {
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if (idlehit_addrs[i] == pc) {
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idlehit_counts[i]++;
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return;
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}
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}
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idlehit_addrs[i] = pc;
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idlehit_counts[i] = 1;
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idlehit_addrs[i+1] = 0;
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}
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#endif
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void SekInitIdleDet(void)
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{
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unsigned short **tmp = realloc(idledet_ptrs, 0x200*4);
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if (tmp == NULL) {
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free(idledet_ptrs);
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idledet_ptrs = NULL;
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}
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else
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idledet_ptrs = tmp;
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idledet_count = idledet_bads = 0;
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idledet_start_frame = Pico.m.frame_count + 360;
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#ifdef IDLE_STATS
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idlehit_addrs[0] = 0;
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#endif
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#ifdef EMU_C68K
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CycloneInitIdle();
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#endif
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#ifdef EMU_F68K
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fm68k_emulate(0, 0, 1);
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#endif
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}
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int SekIsIdleCode(unsigned short *dst, int bytes)
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{
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// printf("SekIsIdleCode %04x %i\n", *dst, bytes);
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switch (bytes)
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{
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case 2:
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if ((*dst & 0xf000) != 0x6000) // not another branch
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return 1;
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break;
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case 4:
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if ( (*dst & 0xfff8) == 0x4a10 || // tst.b ($aX) // there should be no need to wait
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(*dst & 0xfff8) == 0x4a28 || // tst.b ($xxxx,a0) // for byte change anywhere
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(*dst & 0xff3f) == 0x4a38 || // tst.x ($xxxx.w); tas ($xxxx.w)
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(*dst & 0xc1ff) == 0x0038 || // move.x ($xxxx.w), dX
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(*dst & 0xf13f) == 0xb038) // cmp.x ($xxxx.w), dX
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return 1;
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break;
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case 6:
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if ( ((dst[1] & 0xe0) == 0xe0 && ( // RAM and
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*dst == 0x4a39 || // tst.b ($xxxxxxxx)
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*dst == 0x4a79 || // tst.w ($xxxxxxxx)
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*dst == 0x4ab9 || // tst.l ($xxxxxxxx)
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(*dst & 0xc1ff) == 0x0039 || // move.x ($xxxxxxxx), dX
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(*dst & 0xf13f) == 0xb039))||// cmp.x ($xxxxxxxx), dX
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*dst == 0x0838 || // btst $X, ($xxxx.w) [6 byte op]
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(*dst & 0xffbf) == 0x0c38) // cmpi.{b,w} $X, ($xxxx.w)
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return 1;
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break;
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case 8:
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if ( ((dst[2] & 0xe0) == 0xe0 && ( // RAM and
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*dst == 0x0839 || // btst $X, ($xxxxxxxx.w) [8 byte op]
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(*dst & 0xffbf) == 0x0c39))||// cmpi.{b,w} $X, ($xxxxxxxx)
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*dst == 0x0cb8) // cmpi.l $X, ($xxxx.w)
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return 1;
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break;
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case 12:
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if ((*dst & 0xf1f8) == 0x3010 && // move.w (aX), dX
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(dst[1]&0xf100) == 0x0000 && // arithmetic
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(dst[3]&0xf100) == 0x0000) // arithmetic
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return 1;
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break;
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}
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return 0;
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}
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int SekRegisterIdlePatch(unsigned int pc, int oldop, int newop, void *ctx)
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{
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int is_main68k = 1;
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u16 *target;
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uptr v;
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#if defined(EMU_C68K)
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struct Cyclone *cyc = ctx;
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is_main68k = cyc == &PicoCpuCM68k;
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pc -= cyc->membase;
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#elif defined(EMU_F68K)
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is_main68k = ctx == &PicoCpuFM68k;
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#endif
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pc &= ~0xff000000;
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elprintf(EL_IDLE, "idle: patch %06x %04x %04x %c %c #%i", pc, oldop, newop,
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(newop&0x200)?'n':'y', is_main68k?'m':'s', idledet_count);
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// XXX: probably shouldn't patch RAM too
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v = m68k_read16_map[pc >> M68K_MEM_SHIFT];
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if (!(v & 0x80000000))
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target = (u16 *)((v << 1) + pc);
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else {
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if (++idledet_bads > 128)
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return 2; // remove detector
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return 1; // don't patch
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}
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if (idledet_count >= 0x200 && (idledet_count & 0x1ff) == 0) {
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unsigned short **tmp = realloc(idledet_ptrs, (idledet_count+0x200)*4);
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if (tmp == NULL)
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return 1;
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idledet_ptrs = tmp;
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}
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idledet_ptrs[idledet_count++] = target;
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return 0;
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}
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void SekFinishIdleDet(void)
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{
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#ifdef EMU_C68K
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CycloneFinishIdle();
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#endif
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#ifdef EMU_F68K
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fm68k_emulate(0, 0, 2);
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#endif
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while (idledet_count > 0)
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{
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unsigned short *op = idledet_ptrs[--idledet_count];
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if ((*op & 0xfd00) == 0x7100)
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*op &= 0xff, *op |= 0x6600;
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else if ((*op & 0xfd00) == 0x7500)
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*op &= 0xff, *op |= 0x6700;
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else if ((*op & 0xfd00) == 0x7d00)
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*op &= 0xff, *op |= 0x6000;
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else
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elprintf(EL_STATUS|EL_IDLE, "idle: don't know how to restore %04x", *op);
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}
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}
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#if defined(EMU_M68K) && M68K_INSTRUCTION_HOOK == OPT_SPECIFY_HANDLER
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static unsigned char op_flags[0x400000/2] = { 0, };
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static int atexit_set = 0;
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static void make_idc(void)
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{
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FILE *f = fopen("idc.idc", "w");
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int i;
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if (!f) return;
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fprintf(f, "#include <idc.idc>\nstatic main() {\n");
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for (i = 0; i < 0x400000/2; i++)
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if (op_flags[i] != 0)
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fprintf(f, " MakeCode(0x%06x);\n", i*2);
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fprintf(f, "}\n");
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fclose(f);
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}
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void instruction_hook(void)
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{
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if (!atexit_set) {
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atexit(make_idc);
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atexit_set = 1;
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}
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if (REG_PC < 0x400000)
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op_flags[REG_PC/2] = 1;
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}
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#endif
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