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/* |
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* emul_op.cpp - 68k opcodes for ROM patches |
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* |
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* SheepShaver (C) 1997-2002 Christian Bauer and Marc Hellwig |
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* SheepShaver (C) 1997-2004 Christian Bauer and Marc Hellwig |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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#include "name_registry.h" |
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#include "user_strings.h" |
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#include "emul_op.h" |
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#include "thunks.h" |
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#define DEBUG 0 |
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#include "debug.h" |
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void EmulOp(M68kRegisters *r, uint32 pc, int selector) |
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{ |
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D(bug("EmulOp %04x at %08x\n", selector, pc)); |
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switch (selector) { |
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case OP_BREAK: // Breakpoint |
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// Install drivers |
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InstallDrivers(); |
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#if !EMULATED_PPC |
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// Patch MakeExecutable() |
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MakeExecutableTvec = (uint32 *)FindLibSymbol("\023PrivateInterfaceLib", "\016MakeExecutable"); |
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D(bug("MakeExecutable TVECT at %p\n", MakeExecutableTvec)); |
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#ifdef __BEOS__ |
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MakeExecutableTvec[0] = ((uint32 *)MakeExecutable)[0]; |
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#else |
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MakeExecutableTvec[0] = (uint32)MakeExecutable; |
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#endif |
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MakeExecutableTvec[0] = htonl(NativeFunction(NATIVE_MAKE_EXECUTABLE)); |
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#if !EMULATED_PPC |
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MakeExecutableTvec[1] = (uint32)TOC; |
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#endif |
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// Patch DebugStr() |
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static const uint16 proc[] = { |
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M68K_EMUL_OP_DEBUG_STR, |
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0x4e74, // rtd #4 |
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0x0004 |
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PW(M68K_EMUL_OP_DEBUG_STR), |
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PW(0x4e74), // rtd #4 |
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PW(0x0004) |
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}; |
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WriteMacInt32(0x1dfc, (uint32)proc); |
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break; |
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MacOSUtilReset(); |
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AudioReset(); |
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#if 0 |
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printf("DR activated\n"); |
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// Enable DR emulator |
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D(bug("DR activated\n")); |
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WriteMacInt32(KernelDataAddr + 0x17a0, 3); // Prepare for DR emulator activation |
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WriteMacInt32(KernelDataAddr + 0x17c0, DR_CACHE_BASE); |
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WriteMacInt32(KernelDataAddr + 0x17c4, DR_CACHE_SIZE); |
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WriteMacInt32(KernelDataAddr + 0x1b00, DR_CACHE_BASE + 0x10000); |
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memcpy((void *)(DR_CACHE_BASE + 0x10000), (void *)(ROM_BASE + 0x370000), 0x10000); |
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clear_caches((void *)(DR_CACHE_BASE + 0x10000), 0x10000, B_INVALIDATE_ICACHE | B_FLUSH_DCACHE); |
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WriteMacInt32(KernelDataAddr + 0x1b04, DR_CACHE_BASE); |
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WriteMacInt32(KernelDataAddr + 0x1b00, DR_EMULATOR_BASE); |
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memcpy((void *)DR_EMULATOR_BASE, (void *)(ROM_BASE + 0x370000), DR_EMULATOR_SIZE); |
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MakeExecutable(0, (void *)DR_EMULATOR_BASE, DR_EMULATOR_SIZE); |
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#endif |
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break; |
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#if !PRECISE_TIMING |
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TimerInterrupt(); |
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#endif |
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ExecutePPC(VideoVBL); |
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ExecuteNative(NATIVE_VIDEO_VBL); |
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static int tick_counter = 0; |
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if (++tick_counter >= 60) { |
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} |
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if (InterruptFlags & INTFLAG_ETHER) { |
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ClearInterruptFlag(INTFLAG_ETHER); |
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ExecutePPC(EtherIRQ); |
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ExecuteNative(NATIVE_ETHER_IRQ); |
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} |
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if (InterruptFlags & INTFLAG_TIMER) { |
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ClearInterruptFlag(INTFLAG_TIMER); |
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break; |
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case OP_IDLE_TIME: |
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#if __BEOS__ |
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// Sleep if no events pending |
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if (ReadMacInt32(0x14c) == 0) { |
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sleep(16667); |
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} |
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#endif |
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if (ReadMacInt32(0x14c) == 0) |
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Delay_usec(16667); |
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r->a[0] = ReadMacInt32(0x2b6); |
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break; |
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case OP_IDLE_TIME_2: |
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// Sleep if no events pending |
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if (ReadMacInt32(0x14c) == 0) |
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Delay_usec(16667); |
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r->d[0] = (uint32)-2; |
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break; |
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default: |
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printf("FATAL: EMUL_OP called with bogus selector %08x\n", selector); |
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QuitEmulator(); |
