mirror of
https://github.com/RaySollium99/picodrive.git
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9fd440ab06
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@504 be3aeb3a-fb24-0410-a615-afba39da0efa
341 lines
8.7 KiB
C
341 lines
8.7 KiB
C
// This is part of Pico Library
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// (c) Copyright 2004 Dave, All rights reserved.
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// (c) Copyright 2006 notaz, All rights reserved.
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// Free for non-commercial use.
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// For commercial use, separate licencing terms must be obtained.
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#include "PicoInt.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, op;
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pc = SekPc;
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op = PicoCpuCM68k.read16(pc);
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elprintf(EL_ANOMALY, "Unrecognized Opcode %04x @ %06x", op, pc);
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// see if we are not executing trash
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if (pc < 0x200 || (pc > Pico.romsize+4 && (pc&0xe00000)!=0xe00000)) {
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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 int SekInit()
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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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return 0;
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}
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// Reset the 68000:
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PICO_INTERNAL int SekReset()
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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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PicoCpuCM68k.state_flags=0;
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PicoCpuCM68k.osp=0;
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PicoCpuCM68k.srh =0x27; // Supervisor mode
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PicoCpuCM68k.irq=0;
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PicoCpuCM68k.a[7]=PicoCpuCM68k.read32(0); // Stack Pointer
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PicoCpuCM68k.membase=0;
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PicoCpuCM68k.pc=PicoCpuCM68k.checkpc(PicoCpuCM68k.read32(4)); // Program Counter
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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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// data must be word aligned
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PICO_INTERNAL void SekState(int *data)
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{
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#ifdef EMU_C68K
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memcpy32(data,(int *)PicoCpuCM68k.d,0x44/4);
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data[0x11] = PicoCpuCM68k.flags;
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#elif defined(EMU_M68K)
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memcpy32(data, (int *)PicoCpuMM68k.dar, 0x40/4);
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data[0x10] = PicoCpuMM68k.pc;
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data[0x11] = m68k_get_reg(&PicoCpuMM68k, M68K_REG_SR);
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#elif defined(EMU_F68K)
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memcpy32(data, (int *)PicoCpuFM68k.dreg, 0x40/4);
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data[0x10] = PicoCpuFM68k.pc;
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data[0x11] = PicoCpuFM68k.sr;
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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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/* 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 int *idledet_addrs = 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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static unsigned char *rom_verify = NULL;
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void SekInitIdleDet(void)
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{
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void *tmp = realloc(idledet_addrs, 0x200*4);
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if (tmp == NULL) {
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free(idledet_addrs);
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idledet_addrs = NULL;
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}
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else
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idledet_addrs = 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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rom_verify = realloc(rom_verify, Pico.romsize);
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memcpy(rom_verify, Pico.rom, Pico.romsize);
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#ifdef EMU_C68K
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CycloneInitIdle();
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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 4:
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if ( (*dst & 0xfff8) == 0x4a10 || // tst.b ($aX) // where should be no need to wait
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(*dst & 0xfff8) == 0x4a28 || // tst.b ($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
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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 == 0x0838) // btst $X, ($xxxx.w) [6 byte op]
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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
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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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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)
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{
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#ifdef EMU_C68K
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pc -= PicoCpuCM68k.membase;
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#endif
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pc &= ~0xff000000;
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elprintf(EL_IDLE, "idle: patch %06x %04x %04x #%i", pc, oldop, newop, idledet_count);
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if (pc > Pico.romsize) {
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if (++idledet_bads > 128) 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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void *tmp = realloc(idledet_addrs, (idledet_count+0x200)*4);
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if (tmp == NULL) return 1;
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idledet_addrs = tmp;
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}
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idledet_addrs[idledet_count++] = pc;
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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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int done_something = idledet_count > 0;
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#ifdef EMU_C68K
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CycloneFinishIdle();
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#endif
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while (idledet_count > 0)
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{
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unsigned short *op = (unsigned short *)&Pico.rom[idledet_addrs[--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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if (done_something)
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{
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int i;
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for (i = 0; i < Pico.romsize; i++)
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if (rom_verify[i] != Pico.rom[i])
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printf("ROM corruption @ %06x!\n", i), exit(1);
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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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