src/cpus/cpu_m68k_instr.c

/*
 *  Copyright (C) 2005-2006  Anders Gavare.  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright  
 *     notice, this list of conditions and the following disclaimer in the 
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE   
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 *  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 *  SUCH DAMAGE.
 *
 *
 *  $Id: cpu_m68k_instr.c,v 1.7 2006/02/24 01:20:35 debug Exp $
 *
 *  Motorola 68K instructions.
 *
 *  Individual functions should keep track of cpu->n_translated_instrs.
 *  (n_translated_instrs is automatically increased by 1 for each function
 *  call. If no instruction was executed, then it should be decreased. If, say,
 *  4 instructions were combined into one function and executed, then it should
 *  be increased by 3.)
 */


/*
 *  nop:  Do nothing.
 */
X(nop)
{
}


/*****************************************************************************/


X(end_of_page)
{
        /*  Update the PC:  (offset 0, but on the next page)  */
        cpu->pc &= ~((M68K_IC_ENTRIES_PER_PAGE-1) << 1);
        cpu->pc += (M68K_IC_ENTRIES_PER_PAGE << 1);

        /*  Find the new physical page and update the translation pointers:  */
        m68k_pc_to_pointers(cpu);

        /*  end_of_page doesn't count as an executed instruction:  */
        cpu->n_translated_instrs --;
}


/*****************************************************************************/


/*
 *  m68k_instr_to_be_translated():
 *
 *  Translate an instruction word into an m68k_instr_call. ic is filled in with
 *  valid data for the translated instruction, or a "nothing" instruction if
 *  there was a translation failure. The newly translated instruction is then
 *  executed.
 */
X(to_be_translated)
{
        uint32_t addr, low_pc;
        uint16_t iword;
        unsigned char *page;
        unsigned char ib[2];
        int main_opcode;
        /* void (*samepage_function)(struct cpu *, struct m68k_instr_call *);*/

        /*  Figure out the (virtual) address of the instruction:  */
        low_pc = ((size_t)ic - (size_t)cpu->cd.m68k.cur_ic_page)
            / sizeof(struct m68k_instr_call);
        addr = cpu->pc & ~((M68K_IC_ENTRIES_PER_PAGE-1) <<
            M68K_INSTR_ALIGNMENT_SHIFT);
        addr += (low_pc << M68K_INSTR_ALIGNMENT_SHIFT);
        cpu->pc = addr;
        addr &= ~((1 << M68K_INSTR_ALIGNMENT_SHIFT) - 1);

        /*  Read the instruction word from memory:  */
        page = cpu->cd.m68k.host_load[addr >> 12];

        if (page != NULL) {
                /*  fatal("TRANSLATION HIT!\n");  */
                memcpy(ib, page + (addr & 0xfff), sizeof(ib));
        } else {
                /*  fatal("TRANSLATION MISS!\n");  */
                if (!cpu->memory_rw(cpu, cpu->mem, addr, ib,
                    sizeof(ib), MEM_READ, CACHE_INSTRUCTION)) {
                        fatal("to_be_translated(): "
                            "read failed: TODO\n");
                        goto bad;
                }
        }

        iword = *((uint16_t *)&ib[0]);

#ifdef HOST_LITTLE_ENDIAN
        iword = ((iword & 0xff) << 8) |
                ((iword & 0xff00) >> 8);
#endif


        fatal("M68K: iword = 0x%04x\n", iword);


#define DYNTRANS_TO_BE_TRANSLATED_HEAD
#include "cpu_dyntrans.c"
#undef  DYNTRANS_TO_BE_TRANSLATED_HEAD


        /*
         *  Translate the instruction:
         */


/*  TODO  */


        main_opcode = iword;

#if 0
        switch (main_opcode) {

        default:goto bad;
        }
#endif


#define DYNTRANS_TO_BE_TRANSLATED_TAIL
#include "cpu_dyntrans.c" 
#undef  DYNTRANS_TO_BE_TRANSLATED_TAIL
}

1	/*
2	* Copyright (C) 2005-2006 Anders Gavare. All rights reserved.
3	*
4	* Redistribution and use in source and binary forms, with or without
5	* modification, are permitted provided that the following conditions are met:
6	*
7	* 1. Redistributions of source code must retain the above copyright
8	* notice, this list of conditions and the following disclaimer.
9	* 2. Redistributions in binary form must reproduce the above copyright
10	* notice, this list of conditions and the following disclaimer in the
11	* documentation and/or other materials provided with the distribution.
12	* 3. The name of the author may not be used to endorse or promote products
13	* derived from this software without specific prior written permission.
14	*
15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25	* SUCH DAMAGE.
26	*
27	*
28	* $Id: cpu_m68k_instr.c,v 1.7 2006/02/24 01:20:35 debug Exp $
29	*
30	* Motorola 68K instructions.
31	*
32	* Individual functions should keep track of cpu->n_translated_instrs.
33	* (n_translated_instrs is automatically increased by 1 for each function
34	* call. If no instruction was executed, then it should be decreased. If, say,
35	* 4 instructions were combined into one function and executed, then it should
36	* be increased by 3.)
37	*/
38
39
40	/*
41	* nop: Do nothing.
42	*/
43	X(nop)
44	{
45	}
46
47
48	/*****************************************************************************/
49
50
51	X(end_of_page)
52	{
53	/* Update the PC: (offset 0, but on the next page) */
54	cpu->pc &= ~((M68K_IC_ENTRIES_PER_PAGE-1) << 1);
55	cpu->pc += (M68K_IC_ENTRIES_PER_PAGE << 1);
56
57	/* Find the new physical page and update the translation pointers: */
58	m68k_pc_to_pointers(cpu);
59
60	/* end_of_page doesn't count as an executed instruction: */
61	cpu->n_translated_instrs --;
62	}
63
64
65	/*****************************************************************************/
66
67
68	/*
69	* m68k_instr_to_be_translated():
70	*
71	* Translate an instruction word into an m68k_instr_call. ic is filled in with
72	* valid data for the translated instruction, or a "nothing" instruction if
73	* there was a translation failure. The newly translated instruction is then
74	* executed.
75	*/
76	X(to_be_translated)
77	{
78	uint32_t addr, low_pc;
79	uint16_t iword;
80	unsigned char *page;
81	unsigned char ib[2];
82	int main_opcode;
83	/* void (samepage_function)(struct cpu , struct m68k_instr_call );/
84
85	/* Figure out the (virtual) address of the instruction: */
86	low_pc = ((size_t)ic - (size_t)cpu->cd.m68k.cur_ic_page)
87	/ sizeof(struct m68k_instr_call);
88	addr = cpu->pc & ~((M68K_IC_ENTRIES_PER_PAGE-1) <<
89	M68K_INSTR_ALIGNMENT_SHIFT);
90	addr += (low_pc << M68K_INSTR_ALIGNMENT_SHIFT);
91	cpu->pc = addr;
92	addr &= ~((1 << M68K_INSTR_ALIGNMENT_SHIFT) - 1);
93
94	/* Read the instruction word from memory: */
95	page = cpu->cd.m68k.host_load[addr >> 12];
96
97	if (page != NULL) {
98	/* fatal("TRANSLATION HIT!\n"); */
99	memcpy(ib, page + (addr & 0xfff), sizeof(ib));
100	} else {
101	/* fatal("TRANSLATION MISS!\n"); */
102	if (!cpu->memory_rw(cpu, cpu->mem, addr, ib,
103	sizeof(ib), MEM_READ, CACHE_INSTRUCTION)) {
104	fatal("to_be_translated(): "
105	"read failed: TODO\n");
106	goto bad;
107	}
108	}
109
110	iword = ((uint16_t )&ib[0]);
111
112	#ifdef HOST_LITTLE_ENDIAN
113	iword = ((iword & 0xff) << 8) \|
114	((iword & 0xff00) >> 8);
115	#endif
116
117
118	fatal("M68K: iword = 0x%04x\n", iword);
119
120
121	#define DYNTRANS_TO_BE_TRANSLATED_HEAD
122	#include "cpu_dyntrans.c"
123	#undef DYNTRANS_TO_BE_TRANSLATED_HEAD
124
125
126	/*
127	* Translate the instruction:
128	*/
129
130
131	/* TODO */
132
133
134	main_opcode = iword;
135
136	#if 0
137	switch (main_opcode) {
138
139	default:goto bad;
140	}
141	#endif
142
143
144	#define DYNTRANS_TO_BE_TRANSLATED_TAIL
145	#include "cpu_dyntrans.c"
146	#undef DYNTRANS_TO_BE_TRANSLATED_TAIL
147	}
148