X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fm68000%2Fm68kinterface.c;h=8dab55d7690610964ab1e6efaeaa5ab04b2548fc;hb=f005034d4a3990efc8e445ce46222ce32600411b;hp=bdaa0c4d7e2074774ab2616c6d6e6b6d56bbe472;hpb=dffa89ebdee4d328a8e166b30fcdf38a3fc54b28;p=virtualjaguar

diff --git a/src/m68000/m68kinterface.c b/src/m68000/m68kinterface.c
index bdaa0c4..8dab55d 100644
--- a/src/m68000/m68kinterface.c
+++ b/src/m68000/m68kinterface.c
@@ -12,12 +12,12 @@
 //
 
 #include "m68kinterface.h"
+//#include <pthread.h>
 #include "cpudefs.h"
 #include "inlines.h"
 #include "cpuextra.h"
 #include "readcpu.h"
 
-
 // Exception Vectors handled by emulation
 #define EXCEPTION_BUS_ERROR                2 /* This one is not emulated! */
 #define EXCEPTION_ADDRESS_ERROR            3 /* This one is partially emulated (doesn't stack a proper frame yet) */
@@ -54,11 +54,17 @@ STATIC_INLINE uint32_t m68ki_init_exception(void);
 STATIC_INLINE void m68ki_stack_frame_3word(uint32_t pc, uint32_t sr);
 unsigned long IllegalOpcode(uint32_t opcode);
 void BuildCPUFunctionTable(void);
+void m68k_set_irq2(unsigned int intLevel);
 
 // Local "Global" vars
 static int32_t initialCycles;
 cpuop_func * cpuFunctionTable[65536];
 
+// By virtue of the fact that m68k_set_irq() can be called asychronously by
+// another thread, we need something along the lines of this:
+static int checkForIRQToHandle = 0;
+//static pthread_mutex_t executionLock = PTHREAD_MUTEX_INITIALIZER;
+static int IRQLevelToHandle = 0;
 
 #if 0
 #define ADD_CYCLES(A)    m68ki_remaining_cycles += (A)
@@ -121,6 +127,18 @@ void DumpRegisters(void)
 #endif
 
 
+void M68KDebugHalt(void)
+{
+	regs.spcflags |= SPCFLAG_DEBUGGER;
+}
+
+
+void M68KDebugResume(void)
+{
+	regs.spcflags &= ~SPCFLAG_DEBUGGER;
+}
+
+
 void m68k_set_cpu_type(unsigned int type)
 {
 }
@@ -181,6 +199,7 @@ void m68k_pulse_reset(void)
 	REG_PC = m68ki_read_imm_32();
 	m68ki_jump(REG_PC);
 #else
+	regs.spcflags = 0;
 	regs.stopped = 0;
 	regs.remainingCycles = 0;
 	
@@ -197,17 +216,6 @@ void m68k_pulse_reset(void)
 
 int m68k_execute(int num_cycles)
 {
-#if 0
-	/* Make sure we're not stopped */
-	if (CPU_STOPPED)
-	{
-		/* We get here if the CPU is stopped or halted */
-		SET_CYCLES(0);
-		CPU_INT_CYCLES = 0;
-
-		return num_cycles;
-	}
-#else
 	if (regs.stopped)
 	{
 		regs.remainingCycles = 0;	// int32_t
@@ -215,7 +223,6 @@ int m68k_execute(int num_cycles)
 
 		return num_cycles;
 	}
-#endif
 
 #if 0
 	/* Set our pool of clock cycles available */
@@ -239,6 +246,17 @@ int m68k_execute(int num_cycles)
 	/* Main loop.  Keep going until we run out of clock cycles */
 	do
 	{
+		// This is so our debugging code can break in on a dime.
+		// Otherwise, this is just extra slow down :-P
+		if (regs.spcflags & SPCFLAG_DEBUGGER)
+		{
+			// Not sure this is correct... :-P
+			num_cycles = initialCycles - regs.remainingCycles;
+			regs.remainingCycles = 0;	// int32_t
+			regs.interruptCycles = 0;	// uint32_t
+
+			return num_cycles;
+		}
 #if 0
 		/* Set tracing accodring to T1. (T0 is done inside instruction) */
 		m68ki_trace_t1(); /* auto-disable (see m68kcpu.h) */
@@ -311,6 +329,16 @@ if (inRoutine)
 //94C0: 6A02                     BPL.B	$94C4
 //94C2: 2452                     MOVEA.L	(A2), A2			; <--- HERE
 //94C4: 4283                     CLR.L	D3
+#endif
+//		pthread_mutex_lock(&executionLock);
+		if (checkForIRQToHandle)
+		{
+			checkForIRQToHandle = 0;
+			m68k_set_irq2(IRQLevelToHandle);
+		}
+
+#ifdef M68K_HOOK_FUNCTION
+		M68KInstructionHook();
 #endif
 		uint32_t opcode = get_iword(0);
 //if ((opcode & 0xFFF8) == 0x31C0)
@@ -319,14 +347,12 @@ if (inRoutine)
 //}
 		int32_t cycles = (int32_t)(*cpuFunctionTable[opcode])(opcode);
 		regs.remainingCycles -= cycles;
+//		pthread_mutex_unlock(&executionLock);
+
 //printf("Executed opcode $%04X (%i cycles)...\n", opcode, cycles);
 #endif
 	}
-#if 0
-	while (GET_CYCLES() > 0);
-#else
 	while (regs.remainingCycles > 0);
-#endif
 
 #if 0
 	/* set previous PC to current PC for the next entry into the loop */
@@ -348,20 +374,28 @@ if (inRoutine)
 }
 
 
-/* ASG: rewrote so that the int_level is a mask of the IPL0/IPL1/IPL2 bits */
 void m68k_set_irq(unsigned int intLevel)
 {
-#if 0
-	uint old_level = CPU_INT_LEVEL;
-	CPU_INT_LEVEL = int_level << 8;
+	// We need to check for stopped state as well...
+	if (regs.stopped)
+	{
+		m68k_set_irq2(intLevel);
+		return;
+	}
+
+	// Since this can be called asynchronously, we need to fix it so that it
+	// doesn't fuck up the main execution loop.
+	IRQLevelToHandle = intLevel;
+	checkForIRQToHandle = 1;
+}
+
+
+/* ASG: rewrote so that the int_level is a mask of the IPL0/IPL1/IPL2 bits */
+void m68k_set_irq2(unsigned int intLevel)
+{
+//	pthread_mutex_lock(&executionLock);
+//		printf("m68k_set_irq: Could not get the lock!!!\n");
 
-	/* A transition from < 7 to 7 always interrupts (NMI) */
-	/* Note: Level 7 can also level trigger like a normal IRQ */
-	if(old_level != 0x0700 && CPU_INT_LEVEL == 0x0700)
-		m68ki_exception_interrupt(7); /* Edge triggered level 7 (NMI) */
-	else
-		m68ki_check_interrupts(); /* Level triggered (IRQ) */
-#else
 	int oldLevel = regs.intLevel;
 	regs.intLevel = intLevel;
 
@@ -371,7 +405,8 @@ void m68k_set_irq(unsigned int intLevel)
 		m68ki_exception_interrupt(7);		// Edge triggered level 7 (NMI)
 	else
 		m68ki_check_interrupts();			// Level triggered (IRQ)
-#endif
+
+//	pthread_mutex_unlock(&executionLock);
 }
 
 
@@ -454,12 +489,14 @@ void m68ki_exception_interrupt(uint32_t intLevel)
 	CPU_INT_LEVEL = 0;
 #endif /* M68K_EMULATE_INT_ACK */
 #else
-	// Turn off the stopped state
+	// Turn off the stopped state (N.B.: normal 68K behavior!)
 	regs.stopped = 0;
 
 //JLH: need to add halt state?
+// prolly, for debugging/alpine mode... :-/
+// but then again, this should be handled already by the main execution loop :-P
 	// If we are halted, don't do anything
-//	if (CPU_STOPPED)
+//	if (regs.stopped)
 //		return;
 
 	// Acknowledge the interrupt (NOTE: This is a user supplied function!)
@@ -485,9 +522,24 @@ void m68ki_exception_interrupt(uint32_t intLevel)
 	// Set the interrupt mask to the level of the one being serviced
 	regs.intmask = intLevel;
 
+#if 0
+extern int startM68KTracing;
+if (startM68KTracing)
+{
+	printf("IRQ: old PC=%06X, ", regs.pc);
+}
+#endif
+
 	// Get the new PC
 	uint32_t newPC = m68k_read_memory_32(vector << 2);
 
+#if 0
+if (startM68KTracing)
+{
+	printf("new PC=%06X, vector=%u, ", newPC, vector);
+}
+#endif
+
 	// If vector is uninitialized, call the uninitialized interrupt vector
 	if (newPC == 0)
 		newPC = m68k_read_memory_32(EXCEPTION_UNINITIALIZED_INTERRUPT << 2);
@@ -496,6 +548,12 @@ void m68ki_exception_interrupt(uint32_t intLevel)
 	m68ki_stack_frame_3word(regs.pc, sr);
 
 	m68k_setpc(newPC);
+#if 0
+if (startM68KTracing)
+{
+	printf("(PC=%06X)\n", regs.pc);
+}
+#endif
 
 	// Defer cycle counting until later
 	regs.interruptCycles += 56;	// NOT ACCURATE-- !!! FIX !!!
@@ -605,10 +663,16 @@ unsigned int m68k_disassemble(char * str_buff, unsigned int pc, unsigned int cpu
 
 int m68k_cycles_run(void) {}              /* Number of cycles run so far */
 int m68k_cycles_remaining(void) {}        /* Number of cycles left */
-void m68k_modify_timeslice(int cycles) {} /* Modify cycles left */
+//void m68k_modify_timeslice(int cycles) {} /* Modify cycles left */
 //void m68k_end_timeslice(void) {}          /* End timeslice now */
 
 
+void m68k_modify_timeslice(int cycles)
+{
+	regs.remainingCycles = cycles;
+}
+
+
 void m68k_end_timeslice(void)
 {
 #if 0