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root/cebix/SheepShaver/src/kpx_cpu/sheepshaver_glue.cpp

Comparing SheepShaver/src/kpx_cpu/sheepshaver_glue.cpp (file contents):
Revision 1.14 by gbeauche, 2003-11-03T21:28:29Z vs.
Revision 1.25 by cebix, 2004-01-12T15:37:24Z

#	Line 1 | Line 1
1		/*
2		*  sheepshaver_glue.cpp - Glue Kheperix CPU to SheepShaver CPU engine interface
3		*
4	<	*  SheepShaver (C) 1997-2002 Christian Bauer and Marc Hellwig
4	>	*  SheepShaver (C) 1997-2004 Christian Bauer and Marc Hellwig
5		*
6		*  This program is free software; you can redistribute it and/or modify
7		*  it under the terms of the GNU General Public License as published by
#	Line 30 | Line 30
30		#include "sigsegv.h"
31		#include "cpu/ppc/ppc-cpu.hpp"
32		#include "cpu/ppc/ppc-operations.hpp"
33	+	#include "cpu/ppc/ppc-instructions.hpp"
34	+	#include "thunks.h"
35
36		// Used for NativeOp trampolines
37		#include "video.h"
38		#include "name_registry.h"
39		#include "serial.h"
40	+	#include "ether.h"
41
42		#include <stdio.h>
43
#	Line 46 | Line 49
49		#define DEBUG 0
50		#include "debug.h"
51
52	+	// Emulation time statistics
53	+	#define EMUL_TIME_STATS 1
54	+
55	+	#if EMUL_TIME_STATS
56	+	static clock_t emul_start_time;
57	+	static uint32 interrupt_count = 0;
58	+	static clock_t interrupt_time = 0;
59	+	static uint32 exec68k_count = 0;
60	+	static clock_t exec68k_time = 0;
61	+	static uint32 native_exec_count = 0;
62	+	static clock_t native_exec_time = 0;
63	+	static uint32 macos_exec_count = 0;
64	+	static clock_t macos_exec_time = 0;
65	+	#endif
66	+
67		static void enter_mon(void)
68		{
69		// Start up mon in real-mode
#	Line 55 | Line 73 | static void enter_mon(void)
73		#endif
74		}
75
76	+	// From main_*.cpp
77	+	extern uintptr SignalStackBase();
78	+
79	+	// PowerPC EmulOp to exit from emulation looop
80	+	const uint32 POWERPC_EXEC_RETURN = POWERPC_EMUL_OP | 1;
81	+
82		// Enable multicore (main/interrupts) cpu emulation?
83		#define MULTICORE_CPU (ASYNC_IRQ ? 1 : 0)
84
#	Line 73 | Line 97 | static void enter_mon(void)
97		// Pointer to Kernel Data
98		static KernelData * const kernel_data = (KernelData *)KERNEL_DATA_BASE;
99
100	+	// SIGSEGV handler
101	+	static sigsegv_return_t sigsegv_handler(sigsegv_address_t, sigsegv_address_t);
102	+
103	+	// JIT Compiler enabled?
104	+	static inline bool enable_jit_p()
105	+	{
106	+	return PrefsFindBool("jit");
107	+	}
108	+
109
110		/**
111		*              PowerPC emulator glue with special 'sheep' opcodes
112		**/
113
114	+	enum {
115	+	PPC_I(SHEEP) = PPC_I(MAX),
116	+	PPC_I(SHEEP_MAX)
117	+	};
118	+
119		class sheepshaver_cpu
120		: public powerpc_cpu
121		{
#	Line 89 | Line 127 | public:
127		// Constructor
128		sheepshaver_cpu();
129
130	<	// Condition Register accessors
130	>	// CR & XER accessors
131		uint32 get_cr() const           { return cr().get(); }
132		void set_cr(uint32 v)           { cr().set(v); }
133	<
134	<	// Execution loop
97	<	void execute(uint32 entry, bool enable_cache = false);
133	>	uint32 get_xer() const          { return xer().get(); }
134	>	void set_xer(uint32 v)          { xer().set(v); }
135
136		// Execute 68k routine
137		void execute_68k(uint32 entry, M68kRegisters *r);
#	Line 120 | Line 157 | public:
157		// FIXME: really make surre array allocation fail at link time?
158		void *operator new[](size_t);
159		void operator delete[](void *p);
160	+
161	+	// Make sure the SIGSEGV handler can access CPU registers
162	+	friend sigsegv_return_t sigsegv_handler(sigsegv_address_t, sigsegv_address_t);
163		};
164
165		lazy_allocator< sheepshaver_cpu > allocator_helper< sheepshaver_cpu, lazy_allocator >::allocator;
166
167		sheepshaver_cpu::sheepshaver_cpu()
168	<	: powerpc_cpu()
168	>	: powerpc_cpu(enable_jit_p())
169		{
170		init_decoder();
171		}
#	Line 143 | Line 183 | void sheepshaver_cpu::init_decoder()
183		{ "sheep",
184		(execute_pmf)&sheepshaver_cpu::execute_sheep,
185		NULL,
186	+	PPC_I(SHEEP),
187		D_form, 6, 0, CFLOW_JUMP | CFLOW_TRAP
188		}
189		};
#	Line 202 | Line 243 | void sheepshaver_cpu::execute_sheep(uint
243		for (int i = 0; i < 7; i++)
244		r68.a[i] = gpr(16 + i);
245		r68.a[7] = gpr(1);
246	+	uint32 saved_cr = get_cr() & CR_field<2>::mask();
247	+	uint32 saved_xer = get_xer();
248		EmulOp(&r68, gpr(24), EMUL_OP_field::extract(opcode) - 3);
249	+	set_cr(saved_cr);
250	+	set_xer(saved_xer);
251		for (int i = 0; i < 8; i++)
252		gpr(8 + i) = r68.d[i];
253		for (int i = 0; i < 7; i++)
#	Line 215 | Line 260 | void sheepshaver_cpu::execute_sheep(uint
260		}
261		}
262
218	–	// Execution loop
219	–	void sheepshaver_cpu::execute(uint32 entry, bool enable_cache)
220	–	{
221	–	powerpc_cpu::execute(entry, enable_cache);
222	–	}
223	–
263		// Handle MacOS interrupt
264		void sheepshaver_cpu::interrupt(uint32 entry)
265		{
266	+	#if EMUL_TIME_STATS
267	+	interrupt_count++;
268	+	const clock_t interrupt_start = clock();
269	+	#endif
270	+
271		#if !MULTICORE_CPU
272		// Save program counters and branch registers
273		uint32 saved_pc = pc();
#	Line 233 | Line 277 | void sheepshaver_cpu::interrupt(uint32 e
277		#endif
278
279		// Initialize stack pointer to SheepShaver alternate stack base
280	<	gpr(1) = SheepStack1Base - 64;
280	>	gpr(1) = SignalStackBase() - 64;
281
282		// Build trampoline to return from interrupt
283	<	uint32 trampoline[] = { htonl(POWERPC_EMUL_OP | 1) };
283	>	SheepVar32 trampoline = POWERPC_EXEC_RETURN;
284
285		// Prepare registers for nanokernel interrupt routine
286		kernel_data->v[0x004 >> 2] = htonl(gpr(1));
#	Line 255 | Line 299 | void sheepshaver_cpu::interrupt(uint32 e
299		gpr(1)  = KernelDataAddr;
300		gpr(7)  = ntohl(kernel_data->v[0x660 >> 2]);
301		gpr(8)  = 0;
302	<	gpr(10) = (uint32)trampoline;
303	<	gpr(12) = (uint32)trampoline;
302	>	gpr(10) = trampoline.addr();
303	>	gpr(12) = trampoline.addr();
304		gpr(13) = get_cr();
305
306		// rlwimi. r7,r7,8,0,0
#	Line 277 | Line 321 | void sheepshaver_cpu::interrupt(uint32 e
321		ctr()= saved_ctr;
322		gpr(1) = saved_sp;
323		#endif
324	+
325	+	#if EMUL_TIME_STATS
326	+	interrupt_time += (clock() - interrupt_start);
327	+	#endif
328		}
329
330		// Execute 68k routine
331		void sheepshaver_cpu::execute_68k(uint32 entry, M68kRegisters *r)
332		{
333	+	#if EMUL_TIME_STATS
334	+	exec68k_count++;
335	+	const clock_t exec68k_start = clock();
336	+	#endif
337	+
338		#if SAFE_EXEC_68K
339		if (ReadMacInt32(XLM_RUN_MODE) != MODE_EMUL_OP)
340		printf("FATAL: Execute68k() not called from EMUL_OP mode\n");
#	Line 364 | Line 417 | void sheepshaver_cpu::execute_68k(uint32
417		lr() = saved_lr;
418		ctr()= saved_ctr;
419		set_cr(saved_cr);
420	+
421	+	#if EMUL_TIME_STATS
422	+	exec68k_time += (clock() - exec68k_start);
423	+	#endif
424		}
425
426		// Call MacOS PPC code
427		uint32 sheepshaver_cpu::execute_macos_code(uint32 tvect, int nargs, uint32 const *args)
428		{
429	+	#if EMUL_TIME_STATS
430	+	macos_exec_count++;
431	+	const clock_t macos_exec_start = clock();
432	+	#endif
433	+
434		// Save program counters and branch registers
435		uint32 saved_pc = pc();
436		uint32 saved_lr = lr();
437		uint32 saved_ctr= ctr();
438
439		// Build trampoline with EXEC_RETURN
440	<	uint32 trampoline[] = { htonl(POWERPC_EMUL_OP | 1) };
441	<	lr() = (uint32)trampoline;
440	>	SheepVar32 trampoline = POWERPC_EXEC_RETURN;
441	>	lr() = trampoline.addr();
442
443		gpr(1) -= 64;                                                           // Create stack frame
444		uint32 proc = ReadMacInt32(tvect);                      // Get routine address
#	Line 407 | Line 469 | uint32 sheepshaver_cpu::execute_macos_co
469		lr() = saved_lr;
470		ctr()= saved_ctr;
471
472	+	#if EMUL_TIME_STATS
473	+	macos_exec_time += (clock() - macos_exec_start);
474	+	#endif
475	+
476		return retval;
477		}
478
#	Line 416 | Line 482 | inline void sheepshaver_cpu::execute_ppc
482		// Save branch registers
483		uint32 saved_lr = lr();
484
485	<	const uint32 trampoline[] = { htonl(POWERPC_EMUL_OP | 1) };
486	<	lr() = (uint32)trampoline;
485	>	SheepVar32 trampoline = POWERPC_EXEC_RETURN;
486	>	WriteMacInt32(trampoline.addr(), POWERPC_EXEC_RETURN);
487	>	lr() = trampoline.addr();
488
489		execute(entry);
490
#	Line 511 | Line 578 | static sigsegv_return_t sigsegv_handler(
578		if ((addr - ROM_BASE) < ROM_SIZE)
579		return SIGSEGV_RETURN_SKIP_INSTRUCTION;
580
581	<	// Ignore all other faults, if requested
582	<	if (PrefsFindBool("ignoresegv"))
583	<	return SIGSEGV_RETURN_FAILURE;
581	>	// Get program counter of target CPU
582	>	sheepshaver_cpu * const cpu = current_cpu;
583	>	const uint32 pc = cpu->pc();
584	>
585	>	// Fault in Mac ROM or RAM?
586	>	bool mac_fault = (pc >= ROM_BASE) && (pc < (ROM_BASE + ROM_AREA_SIZE)) || (pc >= RAMBase) && (pc < (RAMBase + RAMSize));
587	>	if (mac_fault) {
588	>
589	>	// "VM settings" during MacOS 8 installation
590	>	if (pc == ROM_BASE + 0x488160 && cpu->gpr(20) == 0xf8000000)
591	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
592	>
593	>	// MacOS 8.5 installation
594	>	else if (pc == ROM_BASE + 0x488140 && cpu->gpr(16) == 0xf8000000)
595	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
596	>
597	>	// MacOS 8 serial drivers on startup
598	>	else if (pc == ROM_BASE + 0x48e080 && (cpu->gpr(8) == 0xf3012002 || cpu->gpr(8) == 0xf3012000))
599	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
600	>
601	>	// MacOS 8.1 serial drivers on startup
602	>	else if (pc == ROM_BASE + 0x48c5e0 && (cpu->gpr(20) == 0xf3012002 || cpu->gpr(20) == 0xf3012000))
603	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
604	>	else if (pc == ROM_BASE + 0x4a10a0 && (cpu->gpr(20) == 0xf3012002 || cpu->gpr(20) == 0xf3012000))
605	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
606	>
607	>	// Ignore all other faults, if requested
608	>	if (PrefsFindBool("ignoresegv"))
609	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
610	>	}
611		#else
612		#error "FIXME: You don't have the capability to skip instruction within signal handlers"
613		#endif
#	Line 535 | Line 629 | void init_emul_ppc(void)
629		// Initialize main CPU emulator
630		main_cpu = new sheepshaver_cpu();
631		main_cpu->set_register(powerpc_registers::GPR(3), any_register((uint32)ROM_BASE + 0x30d000));
632	+	main_cpu->set_register(powerpc_registers::GPR(4), any_register(KernelDataAddr + 0x1000));
633		WriteMacInt32(XLM_RUN_MODE, MODE_68K);
634
635		#if MULTICORE_CPU
#	Line 550 | Line 645 | void init_emul_ppc(void)
645		mon_add_command("regs", dump_registers, "regs                     Dump PowerPC registers\n");
646		mon_add_command("log", dump_log, "log                      Dump PowerPC emulation log\n");
647		#endif
648	+
649	+	#if EMUL_TIME_STATS
650	+	emul_start_time = clock();
651	+	#endif
652		}
653
654		/*
#	Line 558 | Line 657 | void init_emul_ppc(void)
657
658		void exit_emul_ppc(void)
659		{
660	+	#if EMUL_TIME_STATS
661	+	clock_t emul_end_time = clock();
662	+
663	+	printf("### Statistics for SheepShaver emulation parts\n");
664	+	const clock_t emul_time = emul_end_time - emul_start_time;
665	+	printf("Total emulation time : %.1f sec\n", double(emul_time) / double(CLOCKS_PER_SEC));
666	+	printf("Total interrupt count: %d (%2.1f Hz)\n", interrupt_count,
667	+	(double(interrupt_count) * CLOCKS_PER_SEC) / double(emul_time));
668	+
669	+	#define PRINT_STATS(LABEL, VAR_PREFIX) do {                                                             \
670	+	printf("Total " LABEL " count : %d\n", VAR_PREFIX##_count);             \
671	+	printf("Total " LABEL " time  : %.1f sec (%.1f%%)\n",                   \
672	+	double(VAR_PREFIX##_time) / double(CLOCKS_PER_SEC),          \
673	+	100.0 * double(VAR_PREFIX##_time) / double(emul_time));      \
674	+	} while (0)
675	+
676	+	PRINT_STATS("Execute68k[Trap] execution", exec68k);
677	+	PRINT_STATS("NativeOp execution", native_exec);
678	+	PRINT_STATS("MacOS routine execution", macos_exec);
679	+
680	+	#undef PRINT_STATS
681	+	printf("\n");
682	+	#endif
683	+
684		delete main_cpu;
685		#if MULTICORE_CPU
686		delete interrupt_cpu;
#	Line 571 | Line 694 | void exit_emul_ppc(void)
694		void emul_ppc(uint32 entry)
695		{
696		current_cpu = main_cpu;
697	<	#if DEBUG
697	>	#if 0
698		current_cpu->start_log();
699		#endif
700		// start emulation loop and enable code translation or caching
701	<	current_cpu->execute(entry, true);
701	>	current_cpu->execute(entry);
702		}
703
704		/*
#	Line 603 | Line 726 | void TriggerInterrupt(void)
726		void sheepshaver_cpu::handle_interrupt(void)
727		{
728		// Do nothing if interrupts are disabled
729	<	if (int32(ReadMacInt32(XLM_IRQ_NEST)) > 0)
729	>	if (*(int32 *)XLM_IRQ_NEST > 0)
730		return;
731
732		// Do nothing if there is no interrupt pending
#	Line 670 | Line 793 | void sheepshaver_cpu::handle_interrupt(v
793		if (InterruptFlags & INTFLAG_VIA) {
794		ClearInterruptFlag(INTFLAG_VIA);
795		ADBInterrupt();
796	<	ExecutePPC(VideoVBL);
796	>	ExecuteNative(NATIVE_VIDEO_VBL);
797		}
798		}
799		#endif
#	Line 680 | Line 803 | void sheepshaver_cpu::handle_interrupt(v
803		}
804		}
805
683	–	/*
684	–	*  Execute NATIVE_OP opcode (called by PowerPC emulator)
685	–	*/
686	–
687	–	#define POWERPC_NATIVE_OP_INIT(LR, OP) \
688	–	tswap32(POWERPC_EMUL_OP | ((LR) << 11) | (((uint32)OP) << 6) | 2)
689	–
690	–	// FIXME: Make sure 32-bit relocations are used
691	–	const uint32 NativeOpTable[NATIVE_OP_MAX] = {
692	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_PATCH_NAME_REGISTRY),
693	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_VIDEO_INSTALL_ACCEL),
694	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_VIDEO_VBL),
695	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_VIDEO_DO_DRIVER_IO),
696	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_IRQ),
697	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_INIT),
698	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_TERM),
699	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_OPEN),
700	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_CLOSE),
701	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_WPUT),
702	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_RSRV),
703	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_NOTHING),
704	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_OPEN),
705	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_PRIME_IN),
706	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_PRIME_OUT),
707	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_CONTROL),
708	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_STATUS),
709	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_CLOSE),
710	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_GET_RESOURCE),
711	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_GET_1_RESOURCE),
712	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_GET_IND_RESOURCE),
713	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_GET_1_IND_RESOURCE),
714	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_R_GET_RESOURCE),
715	–	POWERPC_NATIVE_OP_INIT(0, NATIVE_DISABLE_INTERRUPT),
716	–	POWERPC_NATIVE_OP_INIT(0, NATIVE_ENABLE_INTERRUPT),
717	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_MAKE_EXECUTABLE),
718	–	};
719	–
806		static void get_resource(void);
807		static void get_1_resource(void);
808		static void get_ind_resource(void);
#	Line 727 | Line 813 | static void r_get_resource(void);
813
814		static void NativeOp(int selector)
815		{
816	+	#if EMUL_TIME_STATS
817	+	native_exec_count++;
818	+	const clock_t native_exec_start = clock();
819	+	#endif
820	+
821		switch (selector) {
822		case NATIVE_PATCH_NAME_REGISTRY:
823		DoPatchNameRegistry();
#	Line 741 | Line 832 | static void NativeOp(int selector)
832		GPR(3) = (int32)(int16)VideoDoDriverIO((void *)GPR(3), (void *)GPR(4),
833		(void *)GPR(5), GPR(6), GPR(7));
834		break;
835	<	case NATIVE_GET_RESOURCE:
836	<	get_resource();
835	>	#ifdef WORDS_BIGENDIAN
836	>	case NATIVE_ETHER_IRQ:
837	>	EtherIRQ();
838		break;
839	<	case NATIVE_GET_1_RESOURCE:
840	<	get_1_resource();
839	>	case NATIVE_ETHER_INIT:
840	>	GPR(3) = InitStreamModule((void *)GPR(3));
841		break;
842	<	case NATIVE_GET_IND_RESOURCE:
843	<	get_ind_resource();
842	>	case NATIVE_ETHER_TERM:
843	>	TerminateStreamModule();
844		break;
845	<	case NATIVE_GET_1_IND_RESOURCE:
846	<	get_1_ind_resource();
845	>	case NATIVE_ETHER_OPEN:
846	>	GPR(3) = ether_open((queue_t *)GPR(3), (void *)GPR(4), GPR(5), GPR(6), (void*)GPR(7));
847	>	break;
848	>	case NATIVE_ETHER_CLOSE:
849	>	GPR(3) = ether_close((queue_t *)GPR(3), GPR(4), (void *)GPR(5));
850		break;
851	<	case NATIVE_R_GET_RESOURCE:
852	<	r_get_resource();
851	>	case NATIVE_ETHER_WPUT:
852	>	GPR(3) = ether_wput((queue_t *)GPR(3), (mblk_t *)GPR(4));
853		break;
854	+	case NATIVE_ETHER_RSRV:
855	+	GPR(3) = ether_rsrv((queue_t *)GPR(3));
856	+	break;
857	+	#else
858	+	case NATIVE_ETHER_INIT:
859	+	// FIXME: needs more complicated thunks
860	+	GPR(3) = false;
861	+	break;
862	+	#endif
863		case NATIVE_SERIAL_NOTHING:
864		case NATIVE_SERIAL_OPEN:
865		case NATIVE_SERIAL_PRIME_IN:
#	Line 776 | Line 880 | static void NativeOp(int selector)
880		GPR(3) = serial_callbacks[selector - NATIVE_SERIAL_NOTHING](GPR(3), GPR(4));
881		break;
882		}
883	+	case NATIVE_GET_RESOURCE:
884	+	case NATIVE_GET_1_RESOURCE:
885	+	case NATIVE_GET_IND_RESOURCE:
886	+	case NATIVE_GET_1_IND_RESOURCE:
887	+	case NATIVE_R_GET_RESOURCE: {
888	+	typedef void (*GetResourceCallback)(void);
889	+	static const GetResourceCallback get_resource_callbacks[] = {
890	+	get_resource,
891	+	get_1_resource,
892	+	get_ind_resource,
893	+	get_1_ind_resource,
894	+	r_get_resource
895	+	};
896	+	get_resource_callbacks[selector - NATIVE_GET_RESOURCE]();
897	+	break;
898	+	}
899		case NATIVE_DISABLE_INTERRUPT:
900		DisableInterrupt();
901		break;
#	Line 790 | Line 910 | static void NativeOp(int selector)
910		QuitEmulator();
911		break;
912		}
793	–	}
794	–
795	–	/*
796	–	*  Execute native subroutine (LR must contain return address)
797	–	*/
913
914	<	void ExecuteNative(int selector)
915	<	{
916	<	uint32 tvect[2];
802	<	tvect[0] = tswap32(POWERPC_NATIVE_OP_FUNC(selector));
803	<	tvect[1] = 0; // Fake TVECT
804	<	RoutineDescriptor desc = BUILD_PPC_ROUTINE_DESCRIPTOR(0, tvect);
805	<	M68kRegisters r;
806	<	Execute68k((uint32)&desc, &r);
914	>	#if EMUL_TIME_STATS
915	>	native_exec_time += (clock() - native_exec_start);
916	>	#endif
917		}
918
919		/*
#	Line 824 | Line 934 | void Execute68k(uint32 pc, M68kRegisters
934
935		void Execute68kTrap(uint16 trap, M68kRegisters *r)
936		{
937	<	uint16 proc[2];
938	<	proc[0] = htons(trap);
939	<	proc[1] = htons(M68K_RTS);
940	<	Execute68k((uint32)proc, r);
937	>	SheepVar proc_var(4);
938	>	uint32 proc = proc_var.addr();
939	>	WriteMacInt16(proc, trap);
940	>	WriteMacInt16(proc + 2, M68K_RTS);
941	>	Execute68k(proc, r);
942		}
943
944		/*

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