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root/cebix/SheepShaver/src/Unix/main_unix.cpp

Comparing SheepShaver/src/Unix/main_unix.cpp (file contents):
Revision 1.4 by gbeauche, 2003-05-13T16:59:57Z vs.
Revision 1.18 by gbeauche, 2003-12-05T12:36:10Z

#	Line 108 | Line 108
108		#include "rom_patches.h"
109		#include "user_strings.h"
110		#include "vm_alloc.h"
111	+	#include "sigsegv.h"
112	+	#include "thunks.h"
113
114		#define DEBUG 0
115		#include "debug.h"
#	Line 144 | Line 146
146		const char ROM_FILE_NAME[] = "ROM";
147		const char ROM_FILE_NAME2[] = "Mac OS ROM";
148
149	<	const uint32 ROM_AREA_SIZE = 0x500000;          // Size of ROM area
148	<	const uint32 ROM_END = ROM_BASE + ROM_SIZE;     // End of ROM
149	<
150	<	const uint32 KERNEL_DATA_BASE = 0x68ffe000;     // Address of Kernel Data
151	<	const uint32 KERNEL_DATA2_BASE = 0x5fffe000;    // Alternate address of Kernel Data
152	<	const uint32 KERNEL_AREA_SIZE = 0x2000;         // Size of Kernel Data area
153	<
149	>	const uintptr RAM_BASE = 0x20000000;            // Base address of RAM
150		const uint32 SIG_STACK_SIZE = 0x10000;          // Size of signal stack
151
152
157	–	// 68k Emulator Data
158	–	struct EmulatorData {
159	–	uint32  v[0x400];
160	–	};
161	–
162	–
163	–	// Kernel Data
164	–	struct KernelData {
165	–	uint32  v[0x400];
166	–	EmulatorData ed;
167	–	};
168	–
169	–
153		#if !EMULATED_PPC
154		// Structure in which registers are saved in a signal handler;
155		// sigcontext->regs points to it
#	Line 198 | Line 181 | int64 BusClockSpeed;   // Bus clock speed
181
182
183		// Global variables
184	<	static char *x_display_name = NULL;                     // X11 display name
184	>	char *x_display_name = NULL;                            // X11 display name
185		Display *x_display = NULL;                                      // X11 display handle
186
187		static int zero_fd = 0;                                         // FD of /dev/zero
#	Line 206 | Line 189 | static bool lm_area_mapped = false;                    //
189		static int kernel_area = -1;                            // SHM ID of Kernel Data area
190		static bool rom_area_mapped = false;            // Flag: Mac ROM mmap()ped
191		static bool ram_area_mapped = false;            // Flag: Mac RAM mmap()ped
209	–	static void *mmap_RAMBase = NULL;                       // Base address of mmap()ed RAM area
192		static KernelData *kernel_data;                         // Pointer to Kernel Data
193		static EmulatorData *emulator_data;
194
#	Line 221 | Line 203 | static pthread_t emul_thread;                          // MacO
203		static bool ready_for_signals = false;          // Handler installed, signals can be sent
204		static int64 num_segv = 0;                                      // Number of handled SEGV signals
205
224	–	#if !EMULATED_PPC
206		static struct sigaction sigusr2_action;         // Interrupt signal (of emulator thread)
207	+	#if !EMULATED_PPC
208		static struct sigaction sigsegv_action;         // Data access exception signal (of emulator thread)
209		static struct sigaction sigill_action;          // Illegal instruction signal (of emulator thread)
210		static void *sig_stack = NULL;                          // Stack for signal handlers
#	Line 231 | Line 213 | static bool emul_thread_fatal = false;
213		static sigregs sigsegv_regs;                            // Register dump when crashed
214		#endif
215
216	+	uintptr SheepMem::zero_page = 0;                        // Address of ro page filled in with zeros
217	+	uintptr SheepMem::base = 0x60000000;            // Address of SheepShaver data
218	+	uintptr SheepMem::top = 0;                                      // Top of SheepShaver data (stack like storage)
219	+
220
221		// Prototypes
222		static void Quit(void);
223		static void *emul_func(void *arg);
224		static void *nvram_func(void *arg);
225		static void *tick_func(void *arg);
226	<	#if !EMULATED_PPC
226	>	#if EMULATED_PPC
227	>	static void sigusr2_handler(int sig);
228	>	extern void emul_ppc(uint32 start);
229	>	extern void init_emul_ppc(void);
230	>	extern void exit_emul_ppc(void);
231	>	#else
232		static void sigusr2_handler(int sig, sigcontext_struct *sc);
233		static void sigsegv_handler(int sig, sigcontext_struct *sc);
234		static void sigill_handler(int sig, sigcontext_struct *sc);
#	Line 245 | Line 236 | static void sigill_handler(int sig, sigc
236
237
238		// From asm_linux.S
239	<	#if EMULATED_PPC
249	<	extern int atomic_add(int *var, int v);
250	<	extern int atomic_and(int *var, int v);
251	<	extern int atomic_or(int *var, int v);
252	<	#else
239	>	#if !EMULATED_PPC
240		extern "C" void *get_toc(void);
241		extern "C" void *get_sp(void);
242		extern "C" void flush_icache_range(void *start, void *end);
#	Line 264 | Line 251 | extern void paranoia_check(void);
251		#endif
252
253
254	+	#if EMULATED_PPC
255	+	/*
256	+	*  Atomic operations
257	+	*/
258	+
259	+	#if HAVE_SPINLOCKS
260	+	static spinlock_t atomic_ops_lock = SPIN_LOCK_UNLOCKED;
261	+	#else
262	+	#define spin_lock(LOCK)
263	+	#define spin_unlock(LOCK)
264	+	#endif
265	+
266	+	int atomic_add(int *var, int v)
267	+	{
268	+	spin_lock(&atomic_ops_lock);
269	+	int ret = *var;
270	+	*var += v;
271	+	spin_unlock(&atomic_ops_lock);
272	+	return ret;
273	+	}
274	+
275	+	int atomic_and(int *var, int v)
276	+	{
277	+	spin_lock(&atomic_ops_lock);
278	+	int ret = *var;
279	+	*var &= v;
280	+	spin_unlock(&atomic_ops_lock);
281	+	return ret;
282	+	}
283	+
284	+	int atomic_or(int *var, int v)
285	+	{
286	+	spin_lock(&atomic_ops_lock);
287	+	int ret = *var;
288	+	*var |= v;
289	+	spin_unlock(&atomic_ops_lock);
290	+	return ret;
291	+	}
292	+	#endif
293	+
294	+
295		/*
296		*  Main program
297		*/
#	Line 282 | Line 310 | int main(int argc, char **argv)
310		char str[256];
311		uint32 *boot_globs;
312		int16 i16;
285	–	int drive, driver;
313		int rom_fd;
314		FILE *proc_file;
315		const char *rom_path;
#	Line 292 | Line 319 | int main(int argc, char **argv)
319
320		// Initialize variables
321		RAMBase = 0;
295	–	mmap_RAMBase = NULL;
322		tzset();
323
324		// Print some info
#	Line 445 | Line 471 | int main(int argc, char **argv)
471		ErrorAlert(str);
472		goto quit;
473		}
474	<	kernel_data = (KernelData *)0x68ffe000;
474	>	kernel_data = (KernelData *)KERNEL_DATA_BASE;
475		emulator_data = &kernel_data->ed;
476	<	KernelDataAddr = (uint32)kernel_data;
476	>	KernelDataAddr = KERNEL_DATA_BASE;
477		D(bug("Kernel Data at %p, Emulator Data at %p\n", kernel_data, emulator_data));
478
479	+	// Create area for SheepShaver data
480	+	if (!SheepMem::Init()) {
481	+	sprintf(str, GetString(STR_SHEEP_MEM_MMAP_ERR), strerror(errno));
482	+	ErrorAlert(str);
483	+	goto quit;
484	+	}
485	+
486		// Create area for Mac ROM
487		if (vm_acquire_fixed((char *)ROM_BASE, ROM_AREA_SIZE) < 0) {
488		sprintf(str, GetString(STR_ROM_MMAP_ERR), strerror(errno));
489		ErrorAlert(str);
490		goto quit;
491		}
492	<	#if !EMULATED_PPC
492	>	#if !EMULATED_PPC || defined(__powerpc__)
493		if (vm_protect((char *)ROM_BASE, ROM_AREA_SIZE, VM_PAGE_READ | VM_PAGE_WRITE | VM_PAGE_EXECUTE) < 0) {
494		sprintf(str, GetString(STR_ROM_MMAP_ERR), strerror(errno));
495		ErrorAlert(str);
#	Line 473 | Line 506 | int main(int argc, char **argv)
506		RAMSize = 8*1024*1024;
507		}
508
509	<	mmap_RAMBase = (void *)0x20000000;
477	<	if (vm_acquire_fixed(mmap_RAMBase, RAMSize) < 0) {
509	>	if (vm_acquire_fixed((char *)RAM_BASE, RAMSize) < 0) {
510		sprintf(str, GetString(STR_RAM_MMAP_ERR), strerror(errno));
511		ErrorAlert(str);
512		goto quit;
513		}
514		#if !EMULATED_PPC
515	<	if (vm_protect(mmap_RAMBase, RAMSize, VM_PAGE_READ | VM_PAGE_WRITE | VM_PAGE_EXECUTE) < 0) {
515	>	if (vm_protect((char *)RAM_BASE, RAMSize, VM_PAGE_READ | VM_PAGE_WRITE | VM_PAGE_EXECUTE) < 0) {
516		sprintf(str, GetString(STR_RAM_MMAP_ERR), strerror(errno));
517		ErrorAlert(str);
518		goto quit;
519		}
520		#endif
521	<	RAMBase = (uint32)mmap_RAMBase;
521	>	RAMBase = RAM_BASE;
522		ram_area_mapped = true;
523		D(bug("RAM area at %08x\n", RAMBase));
524
#	Line 528 | Line 560 | int main(int argc, char **argv)
560		XPRAMInit();
561
562		// Set boot volume
563	<	drive = PrefsFindInt32("bootdrive");
563	>	i16 = PrefsFindInt32("bootdrive");
564		XPRAM[0x1378] = i16 >> 8;
565		XPRAM[0x1379] = i16 & 0xff;
566	<	driver = PrefsFindInt32("bootdriver");
566	>	i16 = PrefsFindInt32("bootdriver");
567		XPRAM[0x137a] = i16 >> 8;
568		XPRAM[0x137b] = i16 & 0xff;
569
#	Line 544 | Line 576 | int main(int argc, char **argv)
576		boot_globs[1] = htonl(RAMSize);
577		boot_globs[2] = htonl((uint32)-1);                      // End of bank table
578
579	+	// Init thunks
580	+	if (!ThunksInit())
581	+	goto quit;
582	+
583		// Init drivers
584		SonyInit();
585		DiskInit();
#	Line 587 | Line 623 | int main(int argc, char **argv)
623		// Initialize Kernel Data
624		memset(kernel_data, 0, sizeof(KernelData));
625		if (ROMType == ROMTYPE_NEWWORLD) {
626	<	static uint32 of_dev_tree[4] = {0, 0, 0, 0};
627	<	static uint8 vector_lookup_tbl[128];
628	<	static uint8 vector_mask_tbl[64];
626	>	uintptr of_dev_tree = SheepMem::Reserve(4 * sizeof(uint32));
627	>	memset((void *)of_dev_tree, 0, 4 * sizeof(uint32));
628	>	uintptr vector_lookup_tbl = SheepMem::Reserve(128);
629	>	uintptr vector_mask_tbl = SheepMem::Reserve(64);
630		memset((uint8 *)kernel_data + 0xb80, 0x3d, 0x80);
631	<	memset(vector_lookup_tbl, 0, 128);
632	<	memset(vector_mask_tbl, 0, 64);
631	>	memset((void *)vector_lookup_tbl, 0, 128);
632	>	memset((void *)vector_mask_tbl, 0, 64);
633		kernel_data->v[0xb80 >> 2] = htonl(ROM_BASE);
634	<	kernel_data->v[0xb84 >> 2] = htonl((uint32)of_dev_tree);        // OF device tree base
635	<	kernel_data->v[0xb90 >> 2] = htonl((uint32)vector_lookup_tbl);
636	<	kernel_data->v[0xb94 >> 2] = htonl((uint32)vector_mask_tbl);
634	>	kernel_data->v[0xb84 >> 2] = htonl(of_dev_tree);                        // OF device tree base
635	>	kernel_data->v[0xb90 >> 2] = htonl(vector_lookup_tbl);
636	>	kernel_data->v[0xb94 >> 2] = htonl(vector_mask_tbl);
637		kernel_data->v[0xb98 >> 2] = htonl(ROM_BASE);                           // OpenPIC base
638		kernel_data->v[0xbb0 >> 2] = htonl(0);                                          // ADB base
639		kernel_data->v[0xc20 >> 2] = htonl(RAMSize);
#	Line 632 | Line 669 | int main(int argc, char **argv)
669		D(bug("Initializing Low Memory...\n"));
670		memset(NULL, 0, 0x3000);
671		WriteMacInt32(XLM_SIGNATURE, FOURCC('B','a','a','h'));                  // Signature to detect SheepShaver
672	<	WriteMacInt32(XLM_KERNEL_DATA, (uint32)kernel_data);                    // For trap replacement routines
672	>	WriteMacInt32(XLM_KERNEL_DATA, KernelDataAddr);                                 // For trap replacement routines
673		WriteMacInt32(XLM_PVR, PVR);                                                                    // Theoretical PVR
674		WriteMacInt32(XLM_BUS_CLOCK, BusClockSpeed);                                    // For DriverServicesLib patch
675		WriteMacInt16(XLM_EXEC_RETURN_OPCODE, M68K_EXEC_RETURN);                // For Execute68k() (RTS from the executed 68k code will jump here and end 68k mode)
676	+	WriteMacInt32(XLM_ZERO_PAGE, SheepMem::ZeroPage());                             // Pointer to read-only page with all bits set to 0
677		#if !EMULATED_PPC
678	<	WriteMacInt32(XLM_TOC, (uint32)TOC);                                                    // TOC pointer of emulator
641	<	WriteMacInt32(XLM_ETHER_INIT, (uint32)InitStreamModule);                // DLPI ethernet driver functions
642	<	WriteMacInt32(XLM_ETHER_TERM, (uint32)TerminateStreamModule);
643	<	WriteMacInt32(XLM_ETHER_OPEN, (uint32)ether_open);
644	<	WriteMacInt32(XLM_ETHER_CLOSE, (uint32)ether_close);
645	<	WriteMacInt32(XLM_ETHER_WPUT, (uint32)ether_wput);
646	<	WriteMacInt32(XLM_ETHER_RSRV, (uint32)ether_rsrv);
647	<	WriteMacInt32(XLM_VIDEO_DOIO, (uint32)VideoDoDriverIO);
678	>	WriteMacInt32(XLM_TOC, (uint32)TOC);                                                            // TOC pointer of emulator
679		#endif
680	+	WriteMacInt32(XLM_ETHER_INIT, NativeFunction(NATIVE_ETHER_INIT));       // DLPI ethernet driver functions
681	+	WriteMacInt32(XLM_ETHER_TERM, NativeFunction(NATIVE_ETHER_TERM));
682	+	WriteMacInt32(XLM_ETHER_OPEN, NativeFunction(NATIVE_ETHER_OPEN));
683	+	WriteMacInt32(XLM_ETHER_CLOSE, NativeFunction(NATIVE_ETHER_CLOSE));
684	+	WriteMacInt32(XLM_ETHER_WPUT, NativeFunction(NATIVE_ETHER_WPUT));
685	+	WriteMacInt32(XLM_ETHER_RSRV, NativeFunction(NATIVE_ETHER_RSRV));
686	+	WriteMacInt32(XLM_VIDEO_DOIO, NativeFunction(NATIVE_VIDEO_DO_DRIVER_IO));
687		D(bug("Low Memory initialized\n"));
688
689		// Start 60Hz thread
#	Line 706 | Line 744 | int main(int argc, char **argv)
744		ErrorAlert(str);
745		goto quit;
746		}
747	+	#endif
748
749		// Install interrupt signal handler
750		sigemptyset(&sigusr2_action.sa_mask);
751		sigusr2_action.sa_handler = (__sighandler_t)sigusr2_handler;
752	+	sigusr2_action.sa_flags = 0;
753	+	#if !EMULATED_PPC
754		sigusr2_action.sa_flags = SA_ONSTACK | SA_RESTART;
755	+	#endif
756		sigusr2_action.sa_restorer = NULL;
757		if (sigaction(SIGUSR2, &sigusr2_action, NULL) < 0) {
758		sprintf(str, GetString(STR_SIGUSR2_INSTALL_ERR), strerror(errno));
759		ErrorAlert(str);
760		goto quit;
761		}
720	–	#endif
762
763		// Get my thread ID and execute MacOS thread function
764		emul_thread = pthread_self();
#	Line 736 | Line 777 | quit:
777
778		static void Quit(void)
779		{
780	+	#if EMULATED_PPC
781	+	// Exit PowerPC emulation
782	+	exit_emul_ppc();
783	+	#endif
784	+
785		// Stop 60Hz thread
786		if (tick_thread_active) {
787		pthread_cancel(tick_thread);
#	Line 792 | Line 838 | static void Quit(void)
838		DiskExit();
839		SonyExit();
840
841	+	// Delete SheepShaver globals
842	+	SheepMem::Exit();
843	+
844		// Delete RAM area
845		if (ram_area_mapped)
846	<	vm_release(mmap_RAMBase, RAMSize);
846	>	vm_release((char *)RAM_BASE, RAMSize);
847
848		// Delete ROM area
849		if (rom_area_mapped)
#	Line 839 | Line 888 | static void Quit(void)
888		*/
889
890		#if EMULATED_PPC
842	–	extern void emul_ppc(uint32 start);
843	–	extern void init_emul_ppc(void);
891		void jump_to_rom(uint32 entry)
892		{
893		init_emul_ppc();
#	Line 909 | Line 956 | void Execute68kTrap(uint16 trap, M68kReg
956
957
958		/*
912	–	*  Execute PPC code from EMUL_OP routine (real mode switch)
913	–	*/
914	–
915	–	void ExecutePPC(void (*func)())
916	–	{
917	–	uint32 tvect[2] = {(uint32)func, 0};    // Fake TVECT
918	–	RoutineDescriptor desc = BUILD_PPC_ROUTINE_DESCRIPTOR(0, tvect);
919	–	M68kRegisters r;
920	–	Execute68k((uint32)&desc, &r);
921	–	}
922	–
923	–
924	–	/*
959		*  Quit emulator (cause return from jump_to_rom)
960		*/
961
#	Line 980 | Line 1014 | void Dump68kRegs(M68kRegisters *r)
1014
1015		void MakeExecutable(int dummy, void *start, uint32 length)
1016		{
1017	<	#if !EMULATED_PPC
984	<	if (((uint32)start >= ROM_BASE) && ((uint32)start < (ROM_BASE + ROM_SIZE)))
1017	>	if (((uintptr)start >= ROM_BASE) && ((uintptr)start < (ROM_BASE + ROM_SIZE)))
1018		return;
1019	<	flush_icache_range(start, (void *)((uint32)start + length));
1019	>	#if EMULATED_PPC
1020	>	FlushCodeCache((uintptr)start, (uintptr)start + length);
1021	>	#else
1022	>	flush_icache_range(start, (void *)((uintptr)start + length));
1023		#endif
1024		}
1025
#	Line 994 | Line 1030 | void MakeExecutable(int dummy, void *sta
1030
1031		void PatchAfterStartup(void)
1032		{
1033	<	ExecutePPC(VideoInstallAccel);
1033	>	ExecuteNative(NATIVE_VIDEO_INSTALL_ACCEL);
1034		InstallExtFS();
1035		}
1036
#	Line 1097 | Line 1133 | static void *tick_func(void *arg)
1133
1134		void Set_pthread_attr(pthread_attr_t *attr, int priority)
1135		{
1136	<	// nothing to do
1136	>	#ifdef HAVE_PTHREADS
1137	>	pthread_attr_init(attr);
1138	>	#if defined(_POSIX_THREAD_PRIORITY_SCHEDULING)
1139	>	// Some of these only work for superuser
1140	>	if (geteuid() == 0) {
1141	>	pthread_attr_setinheritsched(attr, PTHREAD_EXPLICIT_SCHED);
1142	>	pthread_attr_setschedpolicy(attr, SCHED_FIFO);
1143	>	struct sched_param fifo_param;
1144	>	fifo_param.sched_priority = ((sched_get_priority_min(SCHED_FIFO) +
1145	>	sched_get_priority_max(SCHED_FIFO)) / 2 +
1146	>	priority);
1147	>	pthread_attr_setschedparam(attr, &fifo_param);
1148	>	}
1149	>	if (pthread_attr_setscope(attr, PTHREAD_SCOPE_SYSTEM) != 0) {
1150	>	#ifdef PTHREAD_SCOPE_BOUND_NP
1151	>	// If system scope is not available (eg. we're not running
1152	>	// with CAP_SCHED_MGT capability on an SGI box), try bound
1153	>	// scope.  It exposes pthread scheduling to the kernel,
1154	>	// without setting realtime priority.
1155	>	pthread_attr_setscope(attr, PTHREAD_SCOPE_BOUND_NP);
1156	>	#endif
1157	>	}
1158	>	#endif
1159	>	#endif
1160		}
1161
1162
#	Line 1105 | Line 1164 | void Set_pthread_attr(pthread_attr_t *at
1164		*  Mutexes
1165		*/
1166
1167	+	#ifdef HAVE_PTHREADS
1168	+
1169	+	struct B2_mutex {
1170	+	B2_mutex() {
1171	+	pthread_mutexattr_t attr;
1172	+	pthread_mutexattr_init(&attr);
1173	+	// Initialize the mutex for priority inheritance --
1174	+	// required for accurate timing.
1175	+	#ifdef HAVE_PTHREAD_MUTEXATTR_SETPROTOCOL
1176	+	pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_INHERIT);
1177	+	#endif
1178	+	#if defined(HAVE_PTHREAD_MUTEXATTR_SETTYPE) && defined(PTHREAD_MUTEX_NORMAL)
1179	+	pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL);
1180	+	#endif
1181	+	#ifdef HAVE_PTHREAD_MUTEXATTR_SETPSHARED
1182	+	pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_PRIVATE);
1183	+	#endif
1184	+	pthread_mutex_init(&m, &attr);
1185	+	pthread_mutexattr_destroy(&attr);
1186	+	}
1187	+	~B2_mutex() {
1188	+	pthread_mutex_trylock(&m); // Make sure it's locked before
1189	+	pthread_mutex_unlock(&m);  // unlocking it.
1190	+	pthread_mutex_destroy(&m);
1191	+	}
1192	+	pthread_mutex_t m;
1193	+	};
1194	+
1195	+	B2_mutex *B2_create_mutex(void)
1196	+	{
1197	+	return new B2_mutex;
1198	+	}
1199	+
1200	+	void B2_lock_mutex(B2_mutex *mutex)
1201	+	{
1202	+	pthread_mutex_lock(&mutex->m);
1203	+	}
1204	+
1205	+	void B2_unlock_mutex(B2_mutex *mutex)
1206	+	{
1207	+	pthread_mutex_unlock(&mutex->m);
1208	+	}
1209	+
1210	+	void B2_delete_mutex(B2_mutex *mutex)
1211	+	{
1212	+	delete mutex;
1213	+	}
1214	+
1215	+	#else
1216	+
1217		struct B2_mutex {
1218		int dummy;
1219		};
#	Line 1127 | Line 1236 | void B2_delete_mutex(B2_mutex *mutex)
1236		delete mutex;
1237		}
1238
1239	+	#endif
1240	+
1241
1242		/*
1243		*  Trigger signal USR2 from another thread
1244		*/
1245
1246	+	#if !EMULATED_PPC || ASYNC_IRQ
1247		void TriggerInterrupt(void)
1248		{
1137	–	#if EMULATED_PPC
1138	–	WriteMacInt32(0x16a, ReadMacInt32(0x16a) + 1);
1139	–	#else
1140	–	#if 0
1141	–	WriteMacInt32(0x16a, ReadMacInt32(0x16a) + 1);
1142	–	#else
1249		if (ready_for_signals)
1250		pthread_kill(emul_thread, SIGUSR2);
1145	–	#endif
1146	–	#endif
1251		}
1252	+	#endif
1253
1254
1255		/*
#	Line 1184 | Line 1289 | void EnableInterrupt(void)
1289		}
1290
1291
1187	–	#if !EMULATED_PPC
1292		/*
1293		*  USR2 handler
1294		*/
1295
1296	+	#if EMULATED_PPC
1297	+	static void sigusr2_handler(int sig)
1298	+	{
1299	+	#if ASYNC_IRQ
1300	+	extern void HandleInterrupt(void);
1301	+	HandleInterrupt();
1302	+	#endif
1303	+	}
1304	+	#else
1305		static void sigusr2_handler(int sig, sigcontext_struct *sc)
1306		{
1307		pt_regs *r = sc->regs;
#	Line 1258 | Line 1371 | static void sigusr2_handler(int sig, sig
1371		if (InterruptFlags & INTFLAG_VIA) {
1372		ClearInterruptFlag(INTFLAG_VIA);
1373		ADBInterrupt();
1374	<	ExecutePPC(VideoVBL);
1374	>	ExecuteNative(NATIVE_VIDEO_VBL);
1375		}
1376		}
1377		#endif
#	Line 1270 | Line 1383 | static void sigusr2_handler(int sig, sig
1383		}
1384		break;
1385		#endif
1273	–
1386		}
1387		}
1388	+	#endif
1389
1390
1391		/*
1392		*  SIGSEGV handler
1393		*/
1394
1395	+	#if !EMULATED_PPC
1396		static void sigsegv_handler(int sig, sigcontext_struct *sc)
1397		{
1398		pt_regs *r = sc->regs;
1399	+
1400	+	// Get effective address
1401	+	uint32 addr = r->dar;
1402	+
1403	+	#if ENABLE_VOSF
1404	+	// Handle screen fault.
1405	+	extern bool Screen_fault_handler(sigsegv_address_t fault_address, sigsegv_address_t fault_instruction);
1406	+	if (Screen_fault_handler((sigsegv_address_t)addr, (sigsegv_address_t)r->nip))
1407	+	return;
1408	+	#endif
1409	+
1410		num_segv++;
1411
1412		// Fault in Mac ROM or RAM?
1413		bool mac_fault = (r->nip >= ROM_BASE) && (r->nip < (ROM_BASE + ROM_AREA_SIZE)) || (r->nip >= RAMBase) && (r->nip < (RAMBase + RAMSize));
1414		if (mac_fault) {
1415
1291	–	// Get opcode and divide into fields
1292	–	uint32 opcode = *((uint32 *)r->nip);
1293	–	uint32 primop = opcode >> 26;
1294	–	uint32 exop = (opcode >> 1) & 0x3ff;
1295	–	uint32 ra = (opcode >> 16) & 0x1f;
1296	–	uint32 rb = (opcode >> 11) & 0x1f;
1297	–	uint32 rd = (opcode >> 21) & 0x1f;
1298	–	int32 imm = (int16)(opcode & 0xffff);
1299	–
1416		// "VM settings" during MacOS 8 installation
1417		if (r->nip == ROM_BASE + 0x488160 && r->gpr[20] == 0xf8000000) {
1418		r->nip += 4;
#	Line 1324 | Line 1440 | static void sigsegv_handler(int sig, sig
1440		return;
1441		}
1442
1443	+	// Get opcode and divide into fields
1444	+	uint32 opcode = *((uint32 *)r->nip);
1445	+	uint32 primop = opcode >> 26;
1446	+	uint32 exop = (opcode >> 1) & 0x3ff;
1447	+	uint32 ra = (opcode >> 16) & 0x1f;
1448	+	uint32 rb = (opcode >> 11) & 0x1f;
1449	+	uint32 rd = (opcode >> 21) & 0x1f;
1450	+	int32 imm = (int16)(opcode & 0xffff);
1451	+
1452		// Analyze opcode
1453		enum {
1454		TYPE_UNKNOWN,
#	Line 1407 | Line 1532 | static void sigsegv_handler(int sig, sig
1532		transfer_type = TYPE_STORE; transfer_size = SIZE_HALFWORD; addr_mode = MODE_U; break;
1533		}
1534
1410	–	// Calculate effective address
1411	–	uint32 addr = 0;
1412	–	switch (addr_mode) {
1413	–	case MODE_X:
1414	–	case MODE_UX:
1415	–	if (ra == 0)
1416	–	addr = r->gpr[rb];
1417	–	else
1418	–	addr = r->gpr[ra] + r->gpr[rb];
1419	–	break;
1420	–	case MODE_NORM:
1421	–	case MODE_U:
1422	–	if (ra == 0)
1423	–	addr = (int32)(int16)imm;
1424	–	else
1425	–	addr = r->gpr[ra] + (int32)(int16)imm;
1426	–	break;
1427	–	default:
1428	–	break;
1429	–	}
1430	–
1535		// Ignore ROM writes
1536		if (transfer_type == TYPE_STORE && addr >= ROM_BASE && addr < ROM_BASE + ROM_SIZE) {
1537		//                      D(bug("WARNING: %s write access to ROM at %08lx, pc %08lx\n", transfer_size == SIZE_BYTE ? "Byte" : transfer_size == SIZE_HALFWORD ? "Halfword" : "Word", addr, r->nip));
#	Line 1664 | Line 1768 | rti:;
1768
1769
1770		/*
1771	+	*  Helpers to share 32-bit addressable data with MacOS
1772	+	*/
1773	+
1774	+	bool SheepMem::Init(void)
1775	+	{
1776	+	if (vm_acquire_fixed((char *)base, size) < 0)
1777	+	return false;
1778	+
1779	+	zero_page = base + size;
1780	+
1781	+	int page_size = getpagesize();
1782	+	if (vm_acquire_fixed((char *)zero_page, page_size) < 0)
1783	+	return false;
1784	+	if (vm_protect((char *)zero_page, page_size, VM_PAGE_READ) < 0)
1785	+	return false;
1786	+
1787	+	top = base + size;
1788	+	return true;
1789	+	}
1790	+
1791	+	void SheepMem::Exit(void)
1792	+	{
1793	+	if (top) {
1794	+	// The zero page is next to SheepShaver globals
1795	+	vm_release((void *)base, size + getpagesize());
1796	+	}
1797	+	}
1798	+
1799	+
1800	+	/*
1801		*  Display alert
1802		*/
1803

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