# HG changeset patch
# User Michael Pavone <pavone@retrodev.com>
# Date 1660457700 25200
# Node ID 408fb8a7e990ff78f1976f0cb92af109873187bd
# Parent  eb2e0e61b1b4920e3720dc58ea0a9b825483c039
Implement argumentless variant of z80 debugger command

diff -r eb2e0e61b1b4 -r 408fb8a7e990 debug.c
--- a/debug.c	Sat Aug 13 22:57:57 2022 -0700
+++ b/debug.c	Sat Aug 13 23:15:00 2022 -0700
@@ -1631,7 +1631,7 @@
 		free_parsed_command(&cmd);
 		return ret;
 	} else {
-		fputs("not implemented yet", stderr);
+		gen->enter_z80_debugger = 1;
 		return 0;
 	}
 }
diff -r eb2e0e61b1b4 -r 408fb8a7e990 genesis.c
--- a/genesis.c	Sat Aug 13 22:57:57 2022 -0700
+++ b/genesis.c	Sat Aug 13 23:15:00 2022 -0700
@@ -377,8 +377,9 @@
 #endif
 }
 
-static void sync_z80(z80_context * z_context, uint32_t mclks)
+static void sync_z80(genesis_context *gen, uint32_t mclks)
 {
+	z80_context *z_context = gen->z80;
 #ifndef NO_Z80
 	if (z80_enabled) {
 #ifdef NEW_CORE
@@ -386,6 +387,13 @@
 			z80_next_int_pulse(z_context);
 		}
 #endif
+		if (gen->enter_z80_debugger && !z_context->reset && !z_context->busack) {
+			while (!z_context->pc) {
+				z80_run(z_context, z_context->current_cycle + 4);
+			}
+			gen->enter_z80_debugger = 0;
+			zdebugger(z_context, z_context->pc);
+		}
 		z80_run(z_context, mclks);
 	} else
 #endif
@@ -444,7 +452,7 @@
 #endif
 
 	uint32_t mclks = context->current_cycle;
-	sync_z80(z_context, mclks);
+	sync_z80(gen, mclks);
 	sync_sound(gen, mclks);
 	vdp_run_context(v_context, mclks);
 	io_run(gen->io.ports, mclks);
@@ -545,7 +553,7 @@
 				//advance Z80 core to the start of an instruction
 				while (!z_context->pc)
 				{
-					sync_z80(z_context, z_context->current_cycle + MCLKS_PER_Z80);
+					sync_z80(gen, z_context->current_cycle + MCLKS_PER_Z80);
 				}
 			}
 #endif
@@ -668,7 +676,7 @@
 			context->current_cycle += m68k_cycle_diff;
 			//Lock the Z80 out of the bus until the VDP access is complete
 			gen->bus_busy = 1;
-			sync_z80(gen->z80, v_context->cycles);
+			sync_z80(gen, v_context->cycles);
 			gen->bus_busy = 0;
 		}
 	} else if (vdp_port < 0x18) {
@@ -765,7 +773,7 @@
 		//Lock the Z80 out of the bus until the VDP access is complete
 		genesis_context *gen = context->system;
 		gen->bus_busy = 1;
-		sync_z80(gen->z80, v_context->cycles);
+		sync_z80(gen, v_context->cycles);
 		gen->bus_busy = 0;
 	}
 #ifdef REFRESH_EMULATION
@@ -942,7 +950,7 @@
 					}
 				}
 			} else if (masked == 0x11200) {
-				sync_z80(gen->z80, context->current_cycle);
+				sync_z80(gen, context->current_cycle);
 				if (value & 1) {
 					if (z80_enabled) {
 						z80_clear_reset(gen->z80, context->current_cycle);
diff -r eb2e0e61b1b4 -r 408fb8a7e990 genesis.h
--- a/genesis.h	Sat Aug 13 22:57:57 2022 -0700
+++ b/genesis.h	Sat Aug 13 23:15:00 2022 -0700
@@ -74,6 +74,7 @@
 	uint8_t         reset_requested;
 	uint8_t         tmss;
 	uint8_t         vdp_unlocked;
+	uint8_t         enter_z80_debugger;
 	eeprom_state    eeprom;
 	nor_state       nor;
 };