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

Comparing SheepShaver/src/kpx_cpu/sheepshaver_glue.cpp (file contents):
Revision 1.10 by gbeauche, 2003-10-26T13:59:03Z vs.
Revision 1.23 by gbeauche, 2003-12-05T13:37:56Z

#	Line 28 | Line 28
28		#include "macos_util.h"
29		#include "block-alloc.hpp"
30		#include "sigsegv.h"
31	–	#include "spcflags.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 47 | 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 56 | 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 74 | 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	<	struct sheepshaver_exec_return { };
114	>	enum {
115	>	PPC_I(SHEEP) = PPC_I(MAX),
116	>	PPC_I(SHEEP_MAX)
117	>	};
118
119		class sheepshaver_cpu
120		: public powerpc_cpu
#	Line 96 | Line 131 | public:
131		uint32 get_cr() const           { return cr().get(); }
132		void set_cr(uint32 v)           { cr().set(v); }
133
99	–	// Execution loop
100	–	void execute(uint32 entry, bool enable_cache = false);
101	–
134		// Execute 68k routine
135		void execute_68k(uint32 entry, M68kRegisters *r);
136
#	Line 115 | Line 147 | public:
147		void interrupt(uint32 entry);
148		void handle_interrupt();
149
118	–	// spcflags for interrupts handling
119	–	static uint32 spcflags;
120	–
150		// Lazy memory allocator (one item at a time)
151		void *operator new(size_t size)
152		{ return allocator_helper< sheepshaver_cpu, lazy_allocator >::allocate(); }
#	Line 126 | Line 155 | public:
155		// FIXME: really make surre array allocation fail at link time?
156		void *operator new[](size_t);
157		void operator delete[](void *p);
158	+
159	+	// Make sure the SIGSEGV handler can access CPU registers
160	+	friend sigsegv_return_t sigsegv_handler(sigsegv_address_t, sigsegv_address_t);
161		};
162
131	–	uint32 sheepshaver_cpu::spcflags = 0;
163		lazy_allocator< sheepshaver_cpu > allocator_helper< sheepshaver_cpu, lazy_allocator >::allocator;
164
165		sheepshaver_cpu::sheepshaver_cpu()
166	<	: powerpc_cpu()
166	>	: powerpc_cpu(enable_jit_p())
167		{
168		init_decoder();
169		}
#	Line 148 | Line 179 | void sheepshaver_cpu::init_decoder()
179
180		static const instr_info_t sheep_ii_table[] = {
181		{ "sheep",
182	<	(execute_fn)&sheepshaver_cpu::execute_sheep,
182	>	(execute_pmf)&sheepshaver_cpu::execute_sheep,
183		NULL,
184	+	PPC_I(SHEEP),
185		D_form, 6, 0, CFLOW_JUMP | CFLOW_TRAP
186		}
187		};
#	Line 189 | Line 221 | void sheepshaver_cpu::execute_sheep(uint
221		break;
222
223		case 1:         // EXEC_RETURN
224	<	throw sheepshaver_exec_return();
224	>	spcflags().set(SPCFLAG_CPU_EXEC_RETURN);
225		break;
226
227		case 2:         // EXEC_NATIVE
#	Line 222 | Line 254 | void sheepshaver_cpu::execute_sheep(uint
254		}
255		}
256
225	–	// Execution loop
226	–	void sheepshaver_cpu::execute(uint32 entry, bool enable_cache)
227	–	{
228	–	try {
229	–	powerpc_cpu::execute(entry, enable_cache);
230	–	}
231	–	catch (sheepshaver_exec_return const &) {
232	–	// Nothing, simply return
233	–	}
234	–	catch (...) {
235	–	printf("ERROR: execute() received an unknown exception!\n");
236	–	QuitEmulator();
237	–	}
238	–	}
239	–
257		// Handle MacOS interrupt
258		void sheepshaver_cpu::interrupt(uint32 entry)
259		{
260	+	#if EMUL_TIME_STATS
261	+	interrupt_count++;
262	+	const clock_t interrupt_start = clock();
263	+	#endif
264	+
265		#if !MULTICORE_CPU
266		// Save program counters and branch registers
267		uint32 saved_pc = pc();
#	Line 249 | Line 271 | void sheepshaver_cpu::interrupt(uint32 e
271		#endif
272
273		// Initialize stack pointer to SheepShaver alternate stack base
274	<	gpr(1) = SheepStack1Base - 64;
274	>	gpr(1) = SignalStackBase() - 64;
275
276		// Build trampoline to return from interrupt
277	<	uint32 trampoline[] = { htonl(POWERPC_EMUL_OP | 1) };
277	>	SheepVar32 trampoline = POWERPC_EXEC_RETURN;
278
279		// Prepare registers for nanokernel interrupt routine
280		kernel_data->v[0x004 >> 2] = htonl(gpr(1));
#	Line 271 | Line 293 | void sheepshaver_cpu::interrupt(uint32 e
293		gpr(1)  = KernelDataAddr;
294		gpr(7)  = ntohl(kernel_data->v[0x660 >> 2]);
295		gpr(8)  = 0;
296	<	gpr(10) = (uint32)trampoline;
297	<	gpr(12) = (uint32)trampoline;
296	>	gpr(10) = trampoline.addr();
297	>	gpr(12) = trampoline.addr();
298		gpr(13) = get_cr();
299
300		// rlwimi. r7,r7,8,0,0
#	Line 293 | Line 315 | void sheepshaver_cpu::interrupt(uint32 e
315		ctr()= saved_ctr;
316		gpr(1) = saved_sp;
317		#endif
318	+
319	+	#if EMUL_TIME_STATS
320	+	interrupt_time += (clock() - interrupt_start);
321	+	#endif
322		}
323
324		// Execute 68k routine
325		void sheepshaver_cpu::execute_68k(uint32 entry, M68kRegisters *r)
326		{
327	+	#if EMUL_TIME_STATS
328	+	exec68k_count++;
329	+	const clock_t exec68k_start = clock();
330	+	#endif
331	+
332		#if SAFE_EXEC_68K
333		if (ReadMacInt32(XLM_RUN_MODE) != MODE_EMUL_OP)
334		printf("FATAL: Execute68k() not called from EMUL_OP mode\n");
#	Line 380 | Line 411 | void sheepshaver_cpu::execute_68k(uint32
411		lr() = saved_lr;
412		ctr()= saved_ctr;
413		set_cr(saved_cr);
414	+
415	+	#if EMUL_TIME_STATS
416	+	exec68k_time += (clock() - exec68k_start);
417	+	#endif
418		}
419
420		// Call MacOS PPC code
421		uint32 sheepshaver_cpu::execute_macos_code(uint32 tvect, int nargs, uint32 const *args)
422		{
423	+	#if EMUL_TIME_STATS
424	+	macos_exec_count++;
425	+	const clock_t macos_exec_start = clock();
426	+	#endif
427	+
428		// Save program counters and branch registers
429		uint32 saved_pc = pc();
430		uint32 saved_lr = lr();
431		uint32 saved_ctr= ctr();
432
433		// Build trampoline with EXEC_RETURN
434	<	uint32 trampoline[] = { htonl(POWERPC_EMUL_OP | 1) };
435	<	lr() = (uint32)trampoline;
434	>	SheepVar32 trampoline = POWERPC_EXEC_RETURN;
435	>	lr() = trampoline.addr();
436
437		gpr(1) -= 64;                                                           // Create stack frame
438		uint32 proc = ReadMacInt32(tvect);                      // Get routine address
#	Line 423 | Line 463 | uint32 sheepshaver_cpu::execute_macos_co
463		lr() = saved_lr;
464		ctr()= saved_ctr;
465
466	+	#if EMUL_TIME_STATS
467	+	macos_exec_time += (clock() - macos_exec_start);
468	+	#endif
469	+
470		return retval;
471		}
472
#	Line 432 | Line 476 | inline void sheepshaver_cpu::execute_ppc
476		// Save branch registers
477		uint32 saved_lr = lr();
478
479	<	const uint32 trampoline[] = { htonl(POWERPC_EMUL_OP | 1) };
480	<	lr() = (uint32)trampoline;
479	>	SheepVar32 trampoline = POWERPC_EXEC_RETURN;
480	>	WriteMacInt32(trampoline.addr(), POWERPC_EXEC_RETURN);
481	>	lr() = trampoline.addr();
482
483		execute(entry);
484
#	Line 527 | Line 572 | static sigsegv_return_t sigsegv_handler(
572		if ((addr - ROM_BASE) < ROM_SIZE)
573		return SIGSEGV_RETURN_SKIP_INSTRUCTION;
574
575	<	// Ignore all other faults, if requested
576	<	if (PrefsFindBool("ignoresegv"))
577	<	return SIGSEGV_RETURN_FAILURE;
575	>	// Get program counter of target CPU
576	>	sheepshaver_cpu * const cpu = current_cpu;
577	>	const uint32 pc = cpu->pc();
578	>
579	>	// Fault in Mac ROM or RAM?
580	>	bool mac_fault = (pc >= ROM_BASE) && (pc < (ROM_BASE + ROM_AREA_SIZE)) || (pc >= RAMBase) && (pc < (RAMBase + RAMSize));
581	>	if (mac_fault) {
582	>
583	>	// "VM settings" during MacOS 8 installation
584	>	if (pc == ROM_BASE + 0x488160 && cpu->gpr(20) == 0xf8000000)
585	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
586	>
587	>	// MacOS 8.5 installation
588	>	else if (pc == ROM_BASE + 0x488140 && cpu->gpr(16) == 0xf8000000)
589	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
590	>
591	>	// MacOS 8 serial drivers on startup
592	>	else if (pc == ROM_BASE + 0x48e080 && (cpu->gpr(8) == 0xf3012002 || cpu->gpr(8) == 0xf3012000))
593	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
594	>
595	>	// MacOS 8.1 serial drivers on startup
596	>	else if (pc == ROM_BASE + 0x48c5e0 && (cpu->gpr(20) == 0xf3012002 || cpu->gpr(20) == 0xf3012000))
597	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
598	>	else if (pc == ROM_BASE + 0x4a10a0 && (cpu->gpr(20) == 0xf3012002 || cpu->gpr(20) == 0xf3012000))
599	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
600	>
601	>	// Ignore all other faults, if requested
602	>	if (PrefsFindBool("ignoresegv"))
603	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
604	>	}
605		#else
606		#error "FIXME: You don't have the capability to skip instruction within signal handlers"
607		#endif
#	Line 566 | Line 638 | void init_emul_ppc(void)
638		mon_add_command("regs", dump_registers, "regs                     Dump PowerPC registers\n");
639		mon_add_command("log", dump_log, "log                      Dump PowerPC emulation log\n");
640		#endif
641	+
642	+	#if EMUL_TIME_STATS
643	+	emul_start_time = clock();
644	+	#endif
645	+	}
646	+
647	+	/*
648	+	*  Deinitialize emulation
649	+	*/
650	+
651	+	void exit_emul_ppc(void)
652	+	{
653	+	#if EMUL_TIME_STATS
654	+	clock_t emul_end_time = clock();
655	+
656	+	printf("### Statistics for SheepShaver emulation parts\n");
657	+	const clock_t emul_time = emul_end_time - emul_start_time;
658	+	printf("Total emulation time : %.1f sec\n", double(emul_time) / double(CLOCKS_PER_SEC));
659	+	printf("Total interrupt count: %d (%2.1f Hz)\n", interrupt_count,
660	+	(double(interrupt_count) * CLOCKS_PER_SEC) / double(emul_time));
661	+
662	+	#define PRINT_STATS(LABEL, VAR_PREFIX) do {                                                             \
663	+	printf("Total " LABEL " count : %d\n", VAR_PREFIX##_count);             \
664	+	printf("Total " LABEL " time  : %.1f sec (%.1f%%)\n",                   \
665	+	double(VAR_PREFIX##_time) / double(CLOCKS_PER_SEC),          \
666	+	100.0 * double(VAR_PREFIX##_time) / double(emul_time));      \
667	+	} while (0)
668	+
669	+	PRINT_STATS("Execute68k[Trap] execution", exec68k);
670	+	PRINT_STATS("NativeOp execution", native_exec);
671	+	PRINT_STATS("MacOS routine execution", macos_exec);
672	+
673	+	#undef PRINT_STATS
674	+	printf("\n");
675	+	#endif
676	+
677	+	delete main_cpu;
678	+	#if MULTICORE_CPU
679	+	delete interrupt_cpu;
680	+	#endif
681		}
682
683		/*
#	Line 579 | Line 691 | void emul_ppc(uint32 entry)
691		current_cpu->start_log();
692		#endif
693		// start emulation loop and enable code translation or caching
694	<	current_cpu->execute(entry, true);
694	>	current_cpu->execute(entry);
695		}
696
697		/*
698		*  Handle PowerPC interrupt
699		*/
700
701	<	#if !ASYNC_IRQ
701	>	#if ASYNC_IRQ
702	>	void HandleInterrupt(void)
703	>	{
704	>	main_cpu->handle_interrupt();
705	>	}
706	>	#else
707		void TriggerInterrupt(void)
708		{
709		#if 0
#	Line 602 | Line 719 | void TriggerInterrupt(void)
719		void sheepshaver_cpu::handle_interrupt(void)
720		{
721		// Do nothing if interrupts are disabled
722	<	if (int32(ReadMacInt32(XLM_IRQ_NEST)) > 0)
722	>	if (*(int32 *)XLM_IRQ_NEST > 0)
723		return;
724
725		// Do nothing if there is no interrupt pending
#	Line 669 | Line 786 | void sheepshaver_cpu::handle_interrupt(v
786		if (InterruptFlags & INTFLAG_VIA) {
787		ClearInterruptFlag(INTFLAG_VIA);
788		ADBInterrupt();
789	<	ExecutePPC(VideoVBL);
789	>	ExecuteNative(NATIVE_VIDEO_VBL);
790		}
791		}
792		#endif
#	Line 679 | Line 796 | void sheepshaver_cpu::handle_interrupt(v
796		}
797		}
798
682	–	/*
683	–	*  Execute NATIVE_OP opcode (called by PowerPC emulator)
684	–	*/
685	–
686	–	#define POWERPC_NATIVE_OP_INIT(LR, OP) \
687	–	tswap32(POWERPC_EMUL_OP | ((LR) << 11) | (((uint32)OP) << 6) | 2)
688	–
689	–	// FIXME: Make sure 32-bit relocations are used
690	–	const uint32 NativeOpTable[NATIVE_OP_MAX] = {
691	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_PATCH_NAME_REGISTRY),
692	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_VIDEO_INSTALL_ACCEL),
693	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_VIDEO_VBL),
694	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_VIDEO_DO_DRIVER_IO),
695	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_IRQ),
696	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_INIT),
697	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_TERM),
698	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_OPEN),
699	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_CLOSE),
700	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_WPUT),
701	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_ETHER_RSRV),
702	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_NOTHING),
703	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_OPEN),
704	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_PRIME_IN),
705	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_PRIME_OUT),
706	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_CONTROL),
707	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_STATUS),
708	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_SERIAL_CLOSE),
709	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_GET_RESOURCE),
710	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_GET_1_RESOURCE),
711	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_GET_IND_RESOURCE),
712	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_GET_1_IND_RESOURCE),
713	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_R_GET_RESOURCE),
714	–	POWERPC_NATIVE_OP_INIT(0, NATIVE_DISABLE_INTERRUPT),
715	–	POWERPC_NATIVE_OP_INIT(0, NATIVE_ENABLE_INTERRUPT),
716	–	POWERPC_NATIVE_OP_INIT(1, NATIVE_MAKE_EXECUTABLE),
717	–	};
718	–
799		static void get_resource(void);
800		static void get_1_resource(void);
801		static void get_ind_resource(void);
#	Line 726 | Line 806 | static void r_get_resource(void);
806
807		static void NativeOp(int selector)
808		{
809	+	#if EMUL_TIME_STATS
810	+	native_exec_count++;
811	+	const clock_t native_exec_start = clock();
812	+	#endif
813	+
814		switch (selector) {
815		case NATIVE_PATCH_NAME_REGISTRY:
816		DoPatchNameRegistry();
#	Line 740 | Line 825 | static void NativeOp(int selector)
825		GPR(3) = (int32)(int16)VideoDoDriverIO((void *)GPR(3), (void *)GPR(4),
826		(void *)GPR(5), GPR(6), GPR(7));
827		break;
828	<	case NATIVE_GET_RESOURCE:
829	<	get_resource();
828	>	#ifdef WORDS_BIGENDIAN
829	>	case NATIVE_ETHER_IRQ:
830	>	EtherIRQ();
831		break;
832	<	case NATIVE_GET_1_RESOURCE:
833	<	get_1_resource();
832	>	case NATIVE_ETHER_INIT:
833	>	GPR(3) = InitStreamModule((void *)GPR(3));
834		break;
835	<	case NATIVE_GET_IND_RESOURCE:
836	<	get_ind_resource();
835	>	case NATIVE_ETHER_TERM:
836	>	TerminateStreamModule();
837		break;
838	<	case NATIVE_GET_1_IND_RESOURCE:
839	<	get_1_ind_resource();
838	>	case NATIVE_ETHER_OPEN:
839	>	GPR(3) = ether_open((queue_t *)GPR(3), (void *)GPR(4), GPR(5), GPR(6), (void*)GPR(7));
840		break;
841	<	case NATIVE_R_GET_RESOURCE:
842	<	r_get_resource();
841	>	case NATIVE_ETHER_CLOSE:
842	>	GPR(3) = ether_close((queue_t *)GPR(3), GPR(4), (void *)GPR(5));
843		break;
844	+	case NATIVE_ETHER_WPUT:
845	+	GPR(3) = ether_wput((queue_t *)GPR(3), (mblk_t *)GPR(4));
846	+	break;
847	+	case NATIVE_ETHER_RSRV:
848	+	GPR(3) = ether_rsrv((queue_t *)GPR(3));
849	+	break;
850	+	#else
851	+	case NATIVE_ETHER_INIT:
852	+	// FIXME: needs more complicated thunks
853	+	GPR(3) = false;
854	+	break;
855	+	#endif
856		case NATIVE_SERIAL_NOTHING:
857		case NATIVE_SERIAL_OPEN:
858		case NATIVE_SERIAL_PRIME_IN:
#	Line 775 | Line 873 | static void NativeOp(int selector)
873		GPR(3) = serial_callbacks[selector - NATIVE_SERIAL_NOTHING](GPR(3), GPR(4));
874		break;
875		}
876	+	case NATIVE_GET_RESOURCE:
877	+	case NATIVE_GET_1_RESOURCE:
878	+	case NATIVE_GET_IND_RESOURCE:
879	+	case NATIVE_GET_1_IND_RESOURCE:
880	+	case NATIVE_R_GET_RESOURCE: {
881	+	typedef void (*GetResourceCallback)(void);
882	+	static const GetResourceCallback get_resource_callbacks[] = {
883	+	get_resource,
884	+	get_1_resource,
885	+	get_ind_resource,
886	+	get_1_ind_resource,
887	+	r_get_resource
888	+	};
889	+	get_resource_callbacks[selector - NATIVE_GET_RESOURCE]();
890	+	break;
891	+	}
892		case NATIVE_DISABLE_INTERRUPT:
893		DisableInterrupt();
894		break;
#	Line 789 | Line 903 | static void NativeOp(int selector)
903		QuitEmulator();
904		break;
905		}
792	–	}
906
907	<	/*
908	<	*  Execute native subroutine (LR must contain return address)
909	<	*/
797	<
798	<	void ExecuteNative(int selector)
799	<	{
800	<	uint32 tvect[2];
801	<	tvect[0] = tswap32(POWERPC_NATIVE_OP_FUNC(selector));
802	<	tvect[1] = 0; // Fake TVECT
803	<	RoutineDescriptor desc = BUILD_PPC_ROUTINE_DESCRIPTOR(0, tvect);
804	<	M68kRegisters r;
805	<	Execute68k((uint32)&desc, &r);
907	>	#if EMUL_TIME_STATS
908	>	native_exec_time += (clock() - native_exec_start);
909	>	#endif
910		}
911
912		/*
#	Line 823 | Line 927 | void Execute68k(uint32 pc, M68kRegisters
927
928		void Execute68kTrap(uint16 trap, M68kRegisters *r)
929		{
930	<	uint16 proc[2];
931	<	proc[0] = htons(trap);
932	<	proc[1] = htons(M68K_RTS);
933	<	Execute68k((uint32)proc, r);
930	>	SheepVar proc_var(4);
931	>	uint32 proc = proc_var.addr();
932	>	WriteMacInt16(proc, trap);
933	>	WriteMacInt16(proc + 2, M68K_RTS);
934	>	Execute68k(proc, r);
935		}
936
937		/*

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