src/uae_cpu/basilisk_glue.cpp

/*
 *  basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
 *
 *  Basilisk II (C) 1997-2001 Christian Bauer
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "sysdeps.h"

#include "cpu_emulation.h"
#include "main.h"
#include "emul_op.h"
#include "rom_patches.h"
#include "m68k.h"
#include "memory.h"
#include "readcpu.h"
#include "newcpu.h"


// RAM and ROM pointers
uint32 RAMBaseMac = 0;          // RAM base (Mac address space) gb-- init is important
uint8 *RAMBaseHost;                     // RAM base (host address space)
uint32 RAMSize;                         // Size of RAM
uint32 ROMBaseMac;                      // ROM base (Mac address space)
uint8 *ROMBaseHost;                     // ROM base (host address space)
uint32 ROMSize;                         // Size of ROM

#if !REAL_ADDRESSING
// Mac frame buffer
uint8 *MacFrameBaseHost;        // Frame buffer base (host address space)
uint32 MacFrameSize;            // Size of frame buffer
int MacFrameLayout;                     // Frame buffer layout
#endif

#if DIRECT_ADDRESSING
uintptr MEMBaseDiff;            // Global offset between a Mac address and its Host equivalent
#endif

// From newcpu.cpp
extern int quit_program;


/*
 *  Initialize 680x0 emulation, CheckROM() must have been called first
 */

bool Init680x0(void)
{
#if REAL_ADDRESSING
        // Mac address space = host address space
        RAMBaseMac = (uint32)RAMBaseHost;
        ROMBaseMac = (uint32)ROMBaseHost;
#elif DIRECT_ADDRESSING
        // Mac address space = host address space minus constant offset (MEMBaseDiff)
        // NOTE: MEMBaseDiff is set in main_unix.cpp/main()
        RAMBaseMac = 0;
        ROMBaseMac = Host2MacAddr(ROMBaseHost);
#else
        // Initialize UAE memory banks
        RAMBaseMac = 0;
        switch (ROMVersion) {
                case ROM_VERSION_64K:
                case ROM_VERSION_PLUS:
                case ROM_VERSION_CLASSIC:
                        ROMBaseMac = 0x00400000;
                        break;
                case ROM_VERSION_II:
                        ROMBaseMac = 0x00a00000;
                        break;
                case ROM_VERSION_32:
                        ROMBaseMac = 0x40800000;
                        break;
                default:
                        return false;
        }
        memory_init();
#endif

        init_m68k();
        return true;
}


/*
 *  Deinitialize 680x0 emulation
 */

void Exit680x0(void)
{
        exit_m68k();
}


/*
 *  Reset and start 680x0 emulation (doesn't return)
 */

void Start680x0(void)
{
        m68k_reset();
        m68k_go(true);
}


/*
 *  Trigger interrupt
 */

void TriggerInterrupt(void)
{
        regs.spcflags |= SPCFLAG_INT;
}

void TriggerNMI(void)
{
        //!! not implemented yet
}


/*
 *  Get 68k interrupt level
 */

int intlev(void)
{
        return InterruptFlags ? 1 : 0;
}


/*
 *  Execute MacOS 68k trap
 *  r->a[7] and r->sr are unused!
 */

void Execute68kTrap(uint16 trap, struct M68kRegisters *r)
{
        int i;

        // Save old PC
        uaecptr oldpc = m68k_getpc();

        // Set registers
        for (i=0; i<8; i++)
                m68k_dreg(regs, i) = r->d[i];
        for (i=0; i<7; i++)
                m68k_areg(regs, i) = r->a[i];

        // Push trap and EXEC_RETURN on stack
        m68k_areg(regs, 7) -= 2;
        put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
        m68k_areg(regs, 7) -= 2;
        put_word(m68k_areg(regs, 7), trap);

        // Execute trap
        m68k_setpc(m68k_areg(regs, 7));
        fill_prefetch_0();
        quit_program = 0;
        m68k_go(true);

        // Clean up stack
        m68k_areg(regs, 7) += 4;

        // Restore old PC
        m68k_setpc(oldpc);
        fill_prefetch_0();

        // Get registers
        for (i=0; i<8; i++)
                r->d[i] = m68k_dreg(regs, i);
        for (i=0; i<7; i++)
                r->a[i] = m68k_areg(regs, i);
        quit_program = 0;
}


/*
 *  Execute 68k subroutine
 *  The executed routine must reside in UAE memory!
 *  r->a[7] and r->sr are unused!
 */

void Execute68k(uint32 addr, struct M68kRegisters *r)
{
        int i;

        // Save old PC
        uaecptr oldpc = m68k_getpc();

        // Set registers
        for (i=0; i<8; i++)
                m68k_dreg(regs, i) = r->d[i];
        for (i=0; i<7; i++)
                m68k_areg(regs, i) = r->a[i];

        // Push EXEC_RETURN and faked return address (points to EXEC_RETURN) on stack
        m68k_areg(regs, 7) -= 2;
        put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
        m68k_areg(regs, 7) -= 4;
        put_long(m68k_areg(regs, 7), m68k_areg(regs, 7) + 4);

        // Execute routine
        m68k_setpc(addr);
        fill_prefetch_0();
        quit_program = 0;
        m68k_go(true);

        // Clean up stack
        m68k_areg(regs, 7) += 2;

        // Restore old PC
        m68k_setpc(oldpc);
        fill_prefetch_0();

        // Get registers
        for (i=0; i<8; i++)
                r->d[i] = m68k_dreg(regs, i);
        for (i=0; i<7; i++)
                r->a[i] = m68k_areg(regs, i);
        quit_program = 0;
}
Revision:	1.10
Committed:	2001-06-26T22:35:42Z (23 years ago) by gbeauche
Branch:	MAIN
Changes since 1.9:	+4 -1 lines
Log Message:	- added SIGSEGV support for Linux/Alpha (to be checked), Darwin/PPC - added uniform virtual memory allocation (supports mmap(), vm_allocate(), or fallbacks to malloc()/free()) - cleaned up memory allocation in main_unix.cpp
#	User	Rev	Content
1	cebix	1.1	/*
2			* basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
3			*
4	cebix	1.8	* Basilisk II (C) 1997-2001 Christian Bauer
5	cebix	1.1	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21			#include "sysdeps.h"
22	cebix	1.4
23	cebix	1.1	#include "cpu_emulation.h"
24			#include "main.h"
25			#include "emul_op.h"
26			#include "rom_patches.h"
27			#include "m68k.h"
28			#include "memory.h"
29			#include "readcpu.h"
30			#include "newcpu.h"
31
32
33			// RAM and ROM pointers
34	gbeauche	1.7	uint32 RAMBaseMac = 0; // RAM base (Mac address space) gb-- init is important
35	cebix	1.1	uint8 *RAMBaseHost; // RAM base (host address space)
36			uint32 RAMSize; // Size of RAM
37			uint32 ROMBaseMac; // ROM base (Mac address space)
38			uint8 *ROMBaseHost; // ROM base (host address space)
39			uint32 ROMSize; // Size of ROM
40
41			#if !REAL_ADDRESSING
42			// Mac frame buffer
43			uint8 *MacFrameBaseHost; // Frame buffer base (host address space)
44			uint32 MacFrameSize; // Size of frame buffer
45			int MacFrameLayout; // Frame buffer layout
46			#endif
47
48	gbeauche	1.7	#if DIRECT_ADDRESSING
49			uintptr MEMBaseDiff; // Global offset between a Mac address and its Host equivalent
50			#endif
51
52	cebix	1.1	// From newcpu.cpp
53			extern int quit_program;
54
55
56			/*
57			* Initialize 680x0 emulation, CheckROM() must have been called first
58			*/
59
60			bool Init680x0(void)
61			{
62			#if REAL_ADDRESSING
63			// Mac address space = host address space
64			RAMBaseMac = (uint32)RAMBaseHost;
65			ROMBaseMac = (uint32)ROMBaseHost;
66	gbeauche	1.7	#elif DIRECT_ADDRESSING
67	gbeauche	1.10	// Mac address space = host address space minus constant offset (MEMBaseDiff)
68			// NOTE: MEMBaseDiff is set in main_unix.cpp/main()
69			RAMBaseMac = 0;
70			ROMBaseMac = Host2MacAddr(ROMBaseHost);
71	cebix	1.1	#else
72			// Initialize UAE memory banks
73			RAMBaseMac = 0;
74			switch (ROMVersion) {
75			case ROM_VERSION_64K:
76			case ROM_VERSION_PLUS:
77			case ROM_VERSION_CLASSIC:
78			ROMBaseMac = 0x00400000;
79			break;
80			case ROM_VERSION_II:
81			ROMBaseMac = 0x00a00000;
82			break;
83			case ROM_VERSION_32:
84			ROMBaseMac = 0x40800000;
85			break;
86			default:
87			return false;
88			}
89			memory_init();
90			#endif
91
92			init_m68k();
93			return true;
94			}
95
96
97			/*
98			* Deinitialize 680x0 emulation
99			*/
100
101			void Exit680x0(void)
102			{
103	gbeauche	1.6	exit_m68k();
104	cebix	1.1	}
105
106
107			/*
108			* Reset and start 680x0 emulation (doesn't return)
109			*/
110
111			void Start680x0(void)
112			{
113			m68k_reset();
114			m68k_go(true);
115			}
116
117
118			/*
119			* Trigger interrupt
120			*/
121
122			void TriggerInterrupt(void)
123			{
124			regs.spcflags \|= SPCFLAG_INT;
125			}
126
127	cebix	1.5	void TriggerNMI(void)
128			{
129			//!! not implemented yet
130			}
131
132	cebix	1.1
133			/*
134			* Get 68k interrupt level
135			*/
136
137			int intlev(void)
138			{
139			return InterruptFlags ? 1 : 0;
140			}
141
142
143			/*
144			* Execute MacOS 68k trap
145			* r->a[7] and r->sr are unused!
146			*/
147
148			void Execute68kTrap(uint16 trap, struct M68kRegisters *r)
149			{
150			int i;
151
152			// Save old PC
153			uaecptr oldpc = m68k_getpc();
154
155			// Set registers
156			for (i=0; i<8; i++)
157			m68k_dreg(regs, i) = r->d[i];
158			for (i=0; i<7; i++)
159			m68k_areg(regs, i) = r->a[i];
160
161			// Push trap and EXEC_RETURN on stack
162			m68k_areg(regs, 7) -= 2;
163			put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
164			m68k_areg(regs, 7) -= 2;
165			put_word(m68k_areg(regs, 7), trap);
166
167			// Execute trap
168			m68k_setpc(m68k_areg(regs, 7));
169			fill_prefetch_0();
170			quit_program = 0;
171			m68k_go(true);
172
173			// Clean up stack
174			m68k_areg(regs, 7) += 4;
175
176			// Restore old PC
177			m68k_setpc(oldpc);
178			fill_prefetch_0();
179
180			// Get registers
181			for (i=0; i<8; i++)
182			r->d[i] = m68k_dreg(regs, i);
183			for (i=0; i<7; i++)
184			r->a[i] = m68k_areg(regs, i);
185			quit_program = 0;
186			}
187
188
189			/*
190			* Execute 68k subroutine
191			* The executed routine must reside in UAE memory!
192			* r->a[7] and r->sr are unused!
193			*/
194
195			void Execute68k(uint32 addr, struct M68kRegisters *r)
196			{
197			int i;
198
199			// Save old PC
200			uaecptr oldpc = m68k_getpc();
201
202			// Set registers
203			for (i=0; i<8; i++)
204			m68k_dreg(regs, i) = r->d[i];
205			for (i=0; i<7; i++)
206			m68k_areg(regs, i) = r->a[i];
207
208			// Push EXEC_RETURN and faked return address (points to EXEC_RETURN) on stack
209			m68k_areg(regs, 7) -= 2;
210			put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
211			m68k_areg(regs, 7) -= 4;
212			put_long(m68k_areg(regs, 7), m68k_areg(regs, 7) + 4);
213
214			// Execute routine
215			m68k_setpc(addr);
216			fill_prefetch_0();
217			quit_program = 0;
218			m68k_go(true);
219
220			// Clean up stack
221			m68k_areg(regs, 7) += 2;
222
223			// Restore old PC
224			m68k_setpc(oldpc);
225			fill_prefetch_0();
226
227			// Get registers
228			for (i=0; i<8; i++)
229			r->d[i] = m68k_dreg(regs, i);
230			for (i=0; i<7; i++)
231			r->a[i] = m68k_areg(regs, i);
232			quit_program = 0;
233			}