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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 1.22 by gbeauche, 2003-12-04T23:37:38Z

#	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	+	// PowerPC EmulOp to exit from emulation looop
77	+	const uint32 POWERPC_EXEC_RETURN = POWERPC_EMUL_OP | 1;
78	+
79		// Enable multicore (main/interrupts) cpu emulation?
80		#define MULTICORE_CPU (ASYNC_IRQ ? 1 : 0)
81
#	Line 74 | Line 94 | static void enter_mon(void)
94		// Pointer to Kernel Data
95		static KernelData * const kernel_data = (KernelData *)KERNEL_DATA_BASE;
96
97	+	// SIGSEGV handler
98	+	static sigsegv_return_t sigsegv_handler(sigsegv_address_t, sigsegv_address_t);
99	+
100	+	// JIT Compiler enabled?
101	+	static inline bool enable_jit_p()
102	+	{
103	+	return PrefsFindBool("jit");
104	+	}
105	+
106
107		/**
108		*              PowerPC emulator glue with special 'sheep' opcodes
109		**/
110
111	<	struct sheepshaver_exec_return { };
111	>	enum {
112	>	PPC_I(SHEEP) = PPC_I(MAX),
113	>	PPC_I(SHEEP_MAX)
114	>	};
115
116		class sheepshaver_cpu
117		: public powerpc_cpu
#	Line 96 | Line 128 | public:
128		uint32 get_cr() const           { return cr().get(); }
129		void set_cr(uint32 v)           { cr().set(v); }
130
99	–	// Execution loop
100	–	void execute(uint32 entry, bool enable_cache = false);
101	–
131		// Execute 68k routine
132		void execute_68k(uint32 entry, M68kRegisters *r);
133
#	Line 115 | Line 144 | public:
144		void interrupt(uint32 entry);
145		void handle_interrupt();
146
118	–	// spcflags for interrupts handling
119	–	static uint32 spcflags;
120	–
147		// Lazy memory allocator (one item at a time)
148		void *operator new(size_t size)
149		{ return allocator_helper< sheepshaver_cpu, lazy_allocator >::allocate(); }
#	Line 126 | Line 152 | public:
152		// FIXME: really make surre array allocation fail at link time?
153		void *operator new[](size_t);
154		void operator delete[](void *p);
155	+
156	+	// Make sure the SIGSEGV handler can access CPU registers
157	+	friend sigsegv_return_t sigsegv_handler(sigsegv_address_t, sigsegv_address_t);
158		};
159
131	–	uint32 sheepshaver_cpu::spcflags = 0;
160		lazy_allocator< sheepshaver_cpu > allocator_helper< sheepshaver_cpu, lazy_allocator >::allocator;
161
162		sheepshaver_cpu::sheepshaver_cpu()
163	<	: powerpc_cpu()
163	>	: powerpc_cpu(enable_jit_p())
164		{
165		init_decoder();
166		}
#	Line 148 | Line 176 | void sheepshaver_cpu::init_decoder()
176
177		static const instr_info_t sheep_ii_table[] = {
178		{ "sheep",
179	<	(execute_fn)&sheepshaver_cpu::execute_sheep,
179	>	(execute_pmf)&sheepshaver_cpu::execute_sheep,
180		NULL,
181	+	PPC_I(SHEEP),
182		D_form, 6, 0, CFLOW_JUMP | CFLOW_TRAP
183		}
184		};
#	Line 189 | Line 218 | void sheepshaver_cpu::execute_sheep(uint
218		break;
219
220		case 1:         // EXEC_RETURN
221	<	throw sheepshaver_exec_return();
221	>	spcflags().set(SPCFLAG_CPU_EXEC_RETURN);
222		break;
223
224		case 2:         // EXEC_NATIVE
#	Line 222 | Line 251 | void sheepshaver_cpu::execute_sheep(uint
251		}
252		}
253
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	–
254		// Handle MacOS interrupt
255		void sheepshaver_cpu::interrupt(uint32 entry)
256		{
257	+	#if EMUL_TIME_STATS
258	+	interrupt_count++;
259	+	const clock_t interrupt_start = clock();
260	+	#endif
261	+
262		#if !MULTICORE_CPU
263		// Save program counters and branch registers
264		uint32 saved_pc = pc();
#	Line 249 | Line 268 | void sheepshaver_cpu::interrupt(uint32 e
268		#endif
269
270		// Initialize stack pointer to SheepShaver alternate stack base
271	<	gpr(1) = SheepStack1Base - 64;
271	>	SheepArray<64> stack_area;
272	>	gpr(1) = stack_area.addr();
273
274		// Build trampoline to return from interrupt
275	<	uint32 trampoline[] = { htonl(POWERPC_EMUL_OP | 1) };
275	>	SheepVar32 trampoline = POWERPC_EXEC_RETURN;
276
277		// Prepare registers for nanokernel interrupt routine
278		kernel_data->v[0x004 >> 2] = htonl(gpr(1));
#	Line 271 | Line 291 | void sheepshaver_cpu::interrupt(uint32 e
291		gpr(1)  = KernelDataAddr;
292		gpr(7)  = ntohl(kernel_data->v[0x660 >> 2]);
293		gpr(8)  = 0;
294	<	gpr(10) = (uint32)trampoline;
295	<	gpr(12) = (uint32)trampoline;
294	>	gpr(10) = trampoline.addr();
295	>	gpr(12) = trampoline.addr();
296		gpr(13) = get_cr();
297
298		// rlwimi. r7,r7,8,0,0
#	Line 293 | Line 313 | void sheepshaver_cpu::interrupt(uint32 e
313		ctr()= saved_ctr;
314		gpr(1) = saved_sp;
315		#endif
316	+
317	+	#if EMUL_TIME_STATS
318	+	interrupt_time += (clock() - interrupt_start);
319	+	#endif
320		}
321
322		// Execute 68k routine
323		void sheepshaver_cpu::execute_68k(uint32 entry, M68kRegisters *r)
324		{
325	+	#if EMUL_TIME_STATS
326	+	exec68k_count++;
327	+	const clock_t exec68k_start = clock();
328	+	#endif
329	+
330		#if SAFE_EXEC_68K
331		if (ReadMacInt32(XLM_RUN_MODE) != MODE_EMUL_OP)
332		printf("FATAL: Execute68k() not called from EMUL_OP mode\n");
#	Line 380 | Line 409 | void sheepshaver_cpu::execute_68k(uint32
409		lr() = saved_lr;
410		ctr()= saved_ctr;
411		set_cr(saved_cr);
412	+
413	+	#if EMUL_TIME_STATS
414	+	exec68k_time += (clock() - exec68k_start);
415	+	#endif
416		}
417
418		// Call MacOS PPC code
419		uint32 sheepshaver_cpu::execute_macos_code(uint32 tvect, int nargs, uint32 const *args)
420		{
421	+	#if EMUL_TIME_STATS
422	+	macos_exec_count++;
423	+	const clock_t macos_exec_start = clock();
424	+	#endif
425	+
426		// Save program counters and branch registers
427		uint32 saved_pc = pc();
428		uint32 saved_lr = lr();
429		uint32 saved_ctr= ctr();
430
431		// Build trampoline with EXEC_RETURN
432	<	uint32 trampoline[] = { htonl(POWERPC_EMUL_OP | 1) };
433	<	lr() = (uint32)trampoline;
432	>	SheepVar32 trampoline = POWERPC_EXEC_RETURN;
433	>	lr() = trampoline.addr();
434
435		gpr(1) -= 64;                                                           // Create stack frame
436		uint32 proc = ReadMacInt32(tvect);                      // Get routine address
#	Line 423 | Line 461 | uint32 sheepshaver_cpu::execute_macos_co
461		lr() = saved_lr;
462		ctr()= saved_ctr;
463
464	+	#if EMUL_TIME_STATS
465	+	macos_exec_time += (clock() - macos_exec_start);
466	+	#endif
467	+
468		return retval;
469		}
470
#	Line 432 | Line 474 | inline void sheepshaver_cpu::execute_ppc
474		// Save branch registers
475		uint32 saved_lr = lr();
476
477	<	const uint32 trampoline[] = { htonl(POWERPC_EMUL_OP | 1) };
478	<	lr() = (uint32)trampoline;
477	>	SheepVar32 trampoline = POWERPC_EXEC_RETURN;
478	>	WriteMacInt32(trampoline.addr(), POWERPC_EXEC_RETURN);
479	>	lr() = trampoline.addr();
480
481		execute(entry);
482
#	Line 527 | Line 570 | static sigsegv_return_t sigsegv_handler(
570		if ((addr - ROM_BASE) < ROM_SIZE)
571		return SIGSEGV_RETURN_SKIP_INSTRUCTION;
572
573	<	// Ignore all other faults, if requested
574	<	if (PrefsFindBool("ignoresegv"))
575	<	return SIGSEGV_RETURN_FAILURE;
573	>	// Get program counter of target CPU
574	>	sheepshaver_cpu * const cpu = current_cpu;
575	>	const uint32 pc = cpu->pc();
576	>
577	>	// Fault in Mac ROM or RAM?
578	>	bool mac_fault = (pc >= ROM_BASE) && (pc < (ROM_BASE + ROM_AREA_SIZE)) || (pc >= RAMBase) && (pc < (RAMBase + RAMSize));
579	>	if (mac_fault) {
580	>
581	>	// "VM settings" during MacOS 8 installation
582	>	if (pc == ROM_BASE + 0x488160 && cpu->gpr(20) == 0xf8000000)
583	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
584	>
585	>	// MacOS 8.5 installation
586	>	else if (pc == ROM_BASE + 0x488140 && cpu->gpr(16) == 0xf8000000)
587	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
588	>
589	>	// MacOS 8 serial drivers on startup
590	>	else if (pc == ROM_BASE + 0x48e080 && (cpu->gpr(8) == 0xf3012002 || cpu->gpr(8) == 0xf3012000))
591	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
592	>
593	>	// MacOS 8.1 serial drivers on startup
594	>	else if (pc == ROM_BASE + 0x48c5e0 && (cpu->gpr(20) == 0xf3012002 || cpu->gpr(20) == 0xf3012000))
595	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
596	>	else if (pc == ROM_BASE + 0x4a10a0 && (cpu->gpr(20) == 0xf3012002 || cpu->gpr(20) == 0xf3012000))
597	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
598	>
599	>	// Ignore all other faults, if requested
600	>	if (PrefsFindBool("ignoresegv"))
601	>	return SIGSEGV_RETURN_SKIP_INSTRUCTION;
602	>	}
603		#else
604		#error "FIXME: You don't have the capability to skip instruction within signal handlers"
605		#endif
#	Line 566 | Line 636 | void init_emul_ppc(void)
636		mon_add_command("regs", dump_registers, "regs                     Dump PowerPC registers\n");
637		mon_add_command("log", dump_log, "log                      Dump PowerPC emulation log\n");
638		#endif
639	+
640	+	#if EMUL_TIME_STATS
641	+	emul_start_time = clock();
642	+	#endif
643	+	}
644	+
645	+	/*
646	+	*  Deinitialize emulation
647	+	*/
648	+
649	+	void exit_emul_ppc(void)
650	+	{
651	+	#if EMUL_TIME_STATS
652	+	clock_t emul_end_time = clock();
653	+
654	+	printf("### Statistics for SheepShaver emulation parts\n");
655	+	const clock_t emul_time = emul_end_time - emul_start_time;
656	+	printf("Total emulation time : %.1f sec\n", double(emul_time) / double(CLOCKS_PER_SEC));
657	+	printf("Total interrupt count: %d (%2.1f Hz)\n", interrupt_count,
658	+	(double(interrupt_count) * CLOCKS_PER_SEC) / double(emul_time));
659	+
660	+	#define PRINT_STATS(LABEL, VAR_PREFIX) do {                                                             \
661	+	printf("Total " LABEL " count : %d\n", VAR_PREFIX##_count);             \
662	+	printf("Total " LABEL " time  : %.1f sec (%.1f%%)\n",                   \
663	+	double(VAR_PREFIX##_time) / double(CLOCKS_PER_SEC),          \
664	+	100.0 * double(VAR_PREFIX##_time) / double(emul_time));      \
665	+	} while (0)
666	+
667	+	PRINT_STATS("Execute68k[Trap] execution", exec68k);
668	+	PRINT_STATS("NativeOp execution", native_exec);
669	+	PRINT_STATS("MacOS routine execution", macos_exec);
670	+
671	+	#undef PRINT_STATS
672	+	printf("\n");
673	+	#endif
674	+
675	+	delete main_cpu;
676	+	#if MULTICORE_CPU
677	+	delete interrupt_cpu;
678	+	#endif
679		}
680
681		/*
#	Line 579 | Line 689 | void emul_ppc(uint32 entry)
689		current_cpu->start_log();
690		#endif
691		// start emulation loop and enable code translation or caching
692	<	current_cpu->execute(entry, true);
692	>	current_cpu->execute(entry);
693		}
694
695		/*
696		*  Handle PowerPC interrupt
697		*/
698
699	<	#if !ASYNC_IRQ
699	>	#if ASYNC_IRQ
700	>	void HandleInterrupt(void)
701	>	{
702	>	main_cpu->handle_interrupt();
703	>	}
704	>	#else
705		void TriggerInterrupt(void)
706		{
707		#if 0
#	Line 602 | Line 717 | void TriggerInterrupt(void)
717		void sheepshaver_cpu::handle_interrupt(void)
718		{
719		// Do nothing if interrupts are disabled
720	<	if (int32(ReadMacInt32(XLM_IRQ_NEST)) > 0)
720	>	if (*(int32 *)XLM_IRQ_NEST > 0)
721		return;
722
723		// Do nothing if there is no interrupt pending
#	Line 669 | Line 784 | void sheepshaver_cpu::handle_interrupt(v
784		if (InterruptFlags & INTFLAG_VIA) {
785		ClearInterruptFlag(INTFLAG_VIA);
786		ADBInterrupt();
787	<	ExecutePPC(VideoVBL);
787	>	ExecuteNative(NATIVE_VIDEO_VBL);
788		}
789		}
790		#endif
#	Line 679 | Line 794 | void sheepshaver_cpu::handle_interrupt(v
794		}
795		}
796
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	–
797		static void get_resource(void);
798		static void get_1_resource(void);
799		static void get_ind_resource(void);
#	Line 726 | Line 804 | static void r_get_resource(void);
804
805		static void NativeOp(int selector)
806		{
807	+	#if EMUL_TIME_STATS
808	+	native_exec_count++;
809	+	const clock_t native_exec_start = clock();
810	+	#endif
811	+
812		switch (selector) {
813		case NATIVE_PATCH_NAME_REGISTRY:
814		DoPatchNameRegistry();
#	Line 740 | Line 823 | static void NativeOp(int selector)
823		GPR(3) = (int32)(int16)VideoDoDriverIO((void *)GPR(3), (void *)GPR(4),
824		(void *)GPR(5), GPR(6), GPR(7));
825		break;
826	<	case NATIVE_GET_RESOURCE:
827	<	get_resource();
826	>	#ifdef WORDS_BIGENDIAN
827	>	case NATIVE_ETHER_IRQ:
828	>	EtherIRQ();
829		break;
830	<	case NATIVE_GET_1_RESOURCE:
831	<	get_1_resource();
830	>	case NATIVE_ETHER_INIT:
831	>	GPR(3) = InitStreamModule((void *)GPR(3));
832		break;
833	<	case NATIVE_GET_IND_RESOURCE:
834	<	get_ind_resource();
833	>	case NATIVE_ETHER_TERM:
834	>	TerminateStreamModule();
835		break;
836	<	case NATIVE_GET_1_IND_RESOURCE:
837	<	get_1_ind_resource();
836	>	case NATIVE_ETHER_OPEN:
837	>	GPR(3) = ether_open((queue_t *)GPR(3), (void *)GPR(4), GPR(5), GPR(6), (void*)GPR(7));
838		break;
839	<	case NATIVE_R_GET_RESOURCE:
840	<	r_get_resource();
839	>	case NATIVE_ETHER_CLOSE:
840	>	GPR(3) = ether_close((queue_t *)GPR(3), GPR(4), (void *)GPR(5));
841		break;
842	+	case NATIVE_ETHER_WPUT:
843	+	GPR(3) = ether_wput((queue_t *)GPR(3), (mblk_t *)GPR(4));
844	+	break;
845	+	case NATIVE_ETHER_RSRV:
846	+	GPR(3) = ether_rsrv((queue_t *)GPR(3));
847	+	break;
848	+	#else
849	+	case NATIVE_ETHER_INIT:
850	+	// FIXME: needs more complicated thunks
851	+	GPR(3) = false;
852	+	break;
853	+	#endif
854		case NATIVE_SERIAL_NOTHING:
855		case NATIVE_SERIAL_OPEN:
856		case NATIVE_SERIAL_PRIME_IN:
#	Line 775 | Line 871 | static void NativeOp(int selector)
871		GPR(3) = serial_callbacks[selector - NATIVE_SERIAL_NOTHING](GPR(3), GPR(4));
872		break;
873		}
874	+	case NATIVE_GET_RESOURCE:
875	+	case NATIVE_GET_1_RESOURCE:
876	+	case NATIVE_GET_IND_RESOURCE:
877	+	case NATIVE_GET_1_IND_RESOURCE:
878	+	case NATIVE_R_GET_RESOURCE: {
879	+	typedef void (*GetResourceCallback)(void);
880	+	static const GetResourceCallback get_resource_callbacks[] = {
881	+	get_resource,
882	+	get_1_resource,
883	+	get_ind_resource,
884	+	get_1_ind_resource,
885	+	r_get_resource
886	+	};
887	+	get_resource_callbacks[selector - NATIVE_GET_RESOURCE]();
888	+	break;
889	+	}
890		case NATIVE_DISABLE_INTERRUPT:
891		DisableInterrupt();
892		break;
#	Line 789 | Line 901 | static void NativeOp(int selector)
901		QuitEmulator();
902		break;
903		}
792	–	}
904
905	<	/*
906	<	*  Execute native subroutine (LR must contain return address)
907	<	*/
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);
905	>	#if EMUL_TIME_STATS
906	>	native_exec_time += (clock() - native_exec_start);
907	>	#endif
908		}
909
910		/*
#	Line 823 | Line 925 | void Execute68k(uint32 pc, M68kRegisters
925
926		void Execute68kTrap(uint16 trap, M68kRegisters *r)
927		{
928	<	uint16 proc[2];
929	<	proc[0] = htons(trap);
930	<	proc[1] = htons(M68K_RTS);
931	<	Execute68k((uint32)proc, r);
928	>	SheepVar proc_var(4);
929	>	uint32 proc = proc_var.addr();
930	>	WriteMacInt16(proc, trap);
931	>	WriteMacInt16(proc + 2, M68K_RTS);
932	>	Execute68k(proc, r);
933		}
934
935		/*

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