/[gxemul]/trunk/src/cpus/cpu_m68k.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Annotation of /trunk/src/cpus/cpu_m68k.c

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Revision 20 - (hide annotations)
Mon Oct 8 16:19:23 2007 UTC (13 years, 3 months ago) by dpavlin
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++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1055 2005/11/25 22:48:36 debug Exp $
20051031	Adding disassembly support for more ARM instructions (clz,
		smul* etc), and adding a hack to support "new tiny" pages
		for StrongARM.
20051101	Minor documentation updates (NetBSD 2.0.2 -> 2.1, and OpenBSD
		3.7 -> 3.8, and lots of testing).
		Changing from 1-sector PIO mode 0 transfers to 128-sector PIO
		mode 3 (in dev_wdc).
		Various minor ARM dyntrans updates (pc-relative loads from
		within the same page as the instruction are now treated as
		constant "mov").
20051102	Re-enabling instruction combinations (they were accidentally
		disabled).
		Dyntrans TLB entries are now overwritten using a round-robin
		scheme instead of randomly. This increases performance.
		Fixing a typo in file.c (thanks to Chuan-Hua Chang for
		noticing it).
		Experimenting with adding ATAPI support to dev_wdc (to make
		emulated *BSD detect cdroms as cdroms, not harddisks).
20051104	Various minor updates.
20051105	Continuing on the ATAPI emulation. Seems to work well enough
		for a NetBSD/cats installation, but not OpenBSD/cats.
		Various other updates.
20051106	Modifying the -Y command line option to allow scaleup with
		certain graphic controllers (only dev_vga so far), not just
		scaledown.
		Some minor dyntrans cleanups.
20051107	Beginning a cleanup up the PCI subsystem (removing the
		read_register hack, etc).
20051108	Continuing the cleanup; splitting up some pci devices into a
		normal autodev device and some separate pci glue code.
20051109	Continuing on the PCI bus stuff; all old pci_*.c have been
		incorporated into normal devices and/or rewritten as glue code
		only, adding a dummy Intel 82371AB PIIX4 for Malta (not really
		tested yet).
		Minor pckbc fix so that Linux doesn't complain.
		Working on the DEC 21143 NIC (ethernet mac rom stuff mostly).
		Various other minor fixes.
20051110	Some more ARM dyntrans fine-tuning (e.g. some instruction
		combinations (cmps followed by conditional branch within the
		same page) and special cases for DPIs with regform when the
		shifter isn't used).
20051111	ARM dyntrans updates: O(n)->O(1) for just-mark-as-non-
		writable in the generic pc_to_pointers function, and some other
		minor hacks.
		Merging Cobalt and evbmips (Malta) ISA interrupt handling,
		and some minor fixes to allow Linux to accept harddisk irqs.
20051112	Minor device updates (pckbc, dec21143, lpt, ...), most
		importantly fixing the ALI M1543/M5229 so that harddisk irqs
		work with Linux/CATS.
20051113	Some more generalizations of the PCI subsystem.
		Finally took the time to add a hack for SCSI CDROM TOCs; this
		enables OpenBSD to use partition 'a' (as needed by the OpenBSD
		installer), and Windows NT's installer to get a bit further.
		Also fixing dev_wdc to allow Linux to detect ATAPI CDROMs.
		Continuing on the DEC 21143.
20051114	Minor ARM dyntrans tweaks; ARM cmps+branch optimization when
		comparing with 0, and generalizing the xchg instr. comb.
		Adding disassembly of ARM mrrc/mcrr and q{,d}{add,sub}.
20051115	Continuing on various PPC things (BATs, other address trans-
		lation things, various loads/stores, BeBox emulation, etc.).
		Beginning to work on PPC interrupt/exception support.
20051116	Factoring out some code which initializes legacy ISA devices
		from those machines that use them (bus_isa).
		Continuing on PPC interrupt/exception support.
20051117	Minor Malta fixes: RTC year offset = 80, disabling a speed hack
		which caused NetBSD to detect a too fast cpu, and adding a new
		hack to make Linux detect a faster cpu.
		Continuing on the Artesyn PM/PPC emulation mode.
		Adding an Algor emulation skeleton (P4032 and P5064);
		implementing some of the basics.
		Continuing on PPC emulation in general; usage of unimplemented
		SPRs is now easier to track, continuing on memory/exception
		related issues, etc.
20051118	More work on PPC emulation (tgpr0..3, exception handling,
		memory stuff, syscalls, etc.).
20051119	Changing the ARM dyntrans code to mostly use cpu->pc, and not
		necessarily use arm reg 15. Seems to work.
		Various PPC updates; continuing on the PReP emulation mode.
20051120	Adding a workaround/hack to dev_mc146818 to allow NetBSD/prep
		to detect the clock.
20051121	More cleanup of the PCI bus (memory and I/O bases, etc).
		Continuing on various PPC things (decrementer and timebase,
		WDCs on obio (on PReP) use irq 13, not 14/15).
20051122	Continuing on the CPC700 controller (interrupts etc) for PMPPC,
		and on PPC stuff in general.
		Finally! After some bug fixes to the virtual to physical addr
		translation, NetBSD/{prep,pmppc} 2.1 reach userland and are
		stable enough to be interacted with.
		More PCI updates; reverse-endian device access for PowerPC etc.
20051123	Generalizing the IEEE floating point subsystem (moving it out
		from src/cpus/cpu_mips_coproc.c into a new src/float_emul.c).
		Input via slave xterms was sometimes not really working; fixing
		this for ns16550, and a warning message is now displayed if
		multiple non-xterm consoles are active.
		Adding some PPC floating point support, etc.
		Various interrupt related updates (dev_wdc, _ns16550, _8259,
		and the isa32 common code in machine.c).
		NetBSD/prep can now be installed! :-) (Well, with some manual
		commands necessary before running sysinst.) Updating the
		documentation and various other things to reflect this.
20051124	Various minor documentation updates.
		Continuing the work on the DEC 21143 NIC.
20051125	LOTS of work on the 21143. Both OpenBSD and NetBSD work fine
		with it now, except that OpenBSD sometimes gives a time-out
		warning.
		Minor documentation updates.

==============  RELEASE 0.3.7  ==============


1 dpavlin 14 /*
2     * Copyright (C) 2005 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 dpavlin 20 * $Id: cpu_m68k.c,v 1.5 2005/11/13 00:14:07 debug Exp $
29 dpavlin 14 *
30     * Motorola 68K CPU emulation.
31     */
32    
33     #include <stdio.h>
34     #include <stdlib.h>
35     #include <string.h>
36     #include <ctype.h>
37    
38     #include "cpu.h"
39     #include "machine.h"
40     #include "memory.h"
41     #include "misc.h"
42     #include "symbol.h"
43    
44    
45     #define DYNTRANS_32
46     #define DYNTRANS_VARIABLE_INSTRUCTION_LENGTH
47     #include "tmp_m68k_head.c"
48    
49    
50     static char *m68k_aname[] = { "a0", "a1", "a2", "a3", "a4", "a5", "fp", "a7" };
51    
52    
53     /*
54     * m68k_cpu_new():
55     *
56     * Create a new M68K cpu object.
57     *
58     * Returns 1 on success, 0 if there was no matching M68K processor with
59     * this cpu_type_name.
60     */
61     int m68k_cpu_new(struct cpu *cpu, struct memory *mem, struct machine *machine,
62     int cpu_id, char *cpu_type_name)
63     {
64     if (strcasecmp(cpu_type_name, "68020") != 0)
65     return 0;
66    
67     cpu->memory_rw = m68k_memory_rw;
68     cpu->update_translation_table = m68k_update_translation_table;
69 dpavlin 18 cpu->invalidate_translation_caches =
70     m68k_invalidate_translation_caches;
71 dpavlin 14 cpu->invalidate_code_translation = m68k_invalidate_code_translation;
72     cpu->is_32bit = 1;
73    
74     cpu->byte_order = EMUL_BIG_ENDIAN;
75    
76     /* Only show name and caches etc for CPU nr 0 (in SMP machines): */
77     if (cpu_id == 0) {
78     debug("%s", cpu->name);
79     }
80    
81     return 1;
82     }
83    
84    
85     /*
86     * m68k_cpu_list_available_types():
87     *
88     * Print a list of available M68K CPU types.
89     */
90     void m68k_cpu_list_available_types(void)
91     {
92     debug("68020\n");
93     /* TODO */
94     }
95    
96    
97     /*
98     * m68k_cpu_dumpinfo():
99     */
100     void m68k_cpu_dumpinfo(struct cpu *cpu)
101     {
102     /* TODO */
103     debug("\n");
104     }
105    
106    
107     /*
108     * m68k_cpu_register_dump():
109     *
110     * Dump cpu registers in a relatively readable format.
111     *
112     * gprs: set to non-zero to dump GPRs and some special-purpose registers.
113     * coprocs: set bit 0..3 to dump registers in coproc 0..3.
114     */
115     void m68k_cpu_register_dump(struct cpu *cpu, int gprs, int coprocs)
116     {
117     char *symbol;
118     uint64_t offset;
119     int x = cpu->cpu_id;
120    
121     if (gprs) {
122     /* Special registers (pc, ...) first: */
123     symbol = get_symbol_name(&cpu->machine->symbol_context,
124     cpu->pc, &offset);
125    
126     debug("cpu%i: pc = 0x%08x", x, (int)cpu->pc);
127     debug(" <%s>\n", symbol != NULL? symbol : " no symbol ");
128     }
129     }
130    
131    
132     /*
133     * m68k_cpu_register_match():
134     */
135     void m68k_cpu_register_match(struct machine *m, char *name,
136     int writeflag, uint64_t *valuep, int *match_register)
137     {
138     int cpunr = 0;
139    
140     /* CPU number: */
141    
142     /* TODO */
143    
144     /* Register name: */
145     if (strcasecmp(name, "pc") == 0) {
146     if (writeflag) {
147     m->cpus[cpunr]->pc = *valuep;
148     } else
149     *valuep = m->cpus[cpunr]->pc;
150     *match_register = 1;
151     }
152     }
153    
154    
155     /*
156     * m68k_cpu_interrupt():
157     */
158     int m68k_cpu_interrupt(struct cpu *cpu, uint64_t irq_nr)
159     {
160     fatal("m68k_cpu_interrupt(): TODO\n");
161     return 0;
162     }
163    
164    
165     /*
166     * m68k_cpu_interrupt_ack():
167     */
168     int m68k_cpu_interrupt_ack(struct cpu *cpu, uint64_t irq_nr)
169     {
170     /* fatal("m68k_cpu_interrupt_ack(): TODO\n"); */
171     return 0;
172     }
173    
174    
175     /* Helper functions: */
176     static void print_two(unsigned char *instr, int *len)
177     { debug(" %02x%02x", instr[*len], instr[*len+1]); (*len) += 2; }
178     static void print_spaces(int len) { int i; debug(" "); for (i=0; i<16-len/2*5;
179     i++) debug(" "); }
180    
181    
182     /*
183     * m68k_cpu_disassemble_instr():
184     *
185     * Convert an instruction word into human readable format, for instruction
186     * tracing.
187     *
188     * If running is 1, cpu->pc should be the address of the instruction.
189     *
190     * If running is 0, things that depend on the runtime environment (eg.
191     * register contents) will not be shown, and addr will be used instead of
192     * cpu->pc for relative addresses.
193     */
194     int m68k_cpu_disassemble_instr(struct cpu *cpu, unsigned char *ib,
195     int running, uint64_t dumpaddr, int bintrans)
196     {
197     uint64_t offset;
198     int len = 0;
199     char *symbol;
200    
201     if (running)
202     dumpaddr = cpu->pc;
203    
204     symbol = get_symbol_name(&cpu->machine->symbol_context,
205     dumpaddr, &offset);
206     if (symbol != NULL && offset==0)
207     debug("<%s>\n", symbol);
208    
209     if (cpu->machine->ncpus > 1 && running)
210     debug("cpu%i: ", cpu->cpu_id);
211    
212     debug("0x%08x: ", (int)dumpaddr);
213    
214     print_two(ib, &len);
215    
216     if (ib[0] == 0x48) {
217     if (ib[1] >= 0x40 && ib[1] <= 0x47) {
218     print_spaces(len);
219     debug("swap\td%i\n", ib[1] & 7);
220     } else if (ib[1] >= 0x48 && ib[1] <= 0x4f) {
221     print_spaces(len);
222     debug("bkpt\t#%i\n", ib[1] & 7);
223     } else {
224     print_spaces(len);
225     debug("UNIMPLEMENTED 0x%02x%02x\n", ib[0], ib[1]);
226     }
227     } else if (ib[0] == 0x4a) {
228     if (ib[1] == 0xfc) {
229     print_spaces(len);
230     debug("illegal\n");
231     } else {
232     print_spaces(len);
233     debug("UNIMPLEMENTED 0x%02x%02x\n", ib[0], ib[1]);
234     }
235     } else if (ib[0] == 0x4e) {
236     if (ib[1] >= 0x40 && ib[1] <= 0x4f) {
237     print_spaces(len);
238     debug("trap\t#%i\n", ib[1] & 15);
239     } else if (ib[1] >= 0x50 && ib[1] <= 0x57) {
240     print_two(ib, &len);
241     print_spaces(len);
242     debug("linkw\t%%%s,#%i\n", m68k_aname[ib[1] & 7],
243     ((ib[2] << 8) + ib[3]));
244     } else if (ib[1] >= 0x58 && ib[1] <= 0x5f) {
245     print_spaces(len);
246     debug("unlk\t%%%s\n", m68k_aname[ib[1] & 7]);
247     } else if (ib[1] == 0x70) {
248     print_spaces(len);
249     debug("reset\n");
250     } else if (ib[1] == 0x71) {
251     print_spaces(len);
252     debug("nop\n");
253     } else if (ib[1] == 0x72) {
254     print_two(ib, &len);
255     print_spaces(len);
256     debug("stop\t#0x%04x\n", ((ib[2] << 8) + ib[3]));
257     } else if (ib[1] == 0x73) {
258     print_spaces(len);
259     debug("rte\n");
260     } else if (ib[1] == 0x74) {
261     print_two(ib, &len);
262     print_spaces(len);
263     debug("rtd\t#0x%04x\n", ((ib[2] << 8) + ib[3]));
264     } else if (ib[1] == 0x75) {
265     print_spaces(len);
266     debug("rts\n");
267     } else {
268     print_spaces(len);
269     debug("UNIMPLEMENTED 0x%02x%02x\n", ib[0], ib[1]);
270     }
271     } else {
272     print_spaces(len);
273     debug("UNIMPLEMENTED 0x%02x%02x\n", ib[0], ib[1]);
274     }
275    
276     return len;
277     }
278    
279    
280     #include "tmp_m68k_tail.c"
281    

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