/[gxemul]/trunk/src/cpus/memory_m88k.c
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Annotation of /trunk/src/cpus/memory_m88k.c

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Revision 42 - (hide annotations)
Mon Oct 8 16:22:32 2007 UTC (16 years, 6 months ago) by dpavlin
File MIME type: text/plain
File size: 12219 byte(s) 
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1613 2007/06/15 20:11:26 debug Exp $
20070501	Continuing a little on m88k disassembly (control registers,
		more instructions).
		Adding a dummy mvme88k machine mode.
20070502	Re-adding MIPS load/store alignment exceptions.
20070503	Implementing more of the M88K disassembly code.
20070504	Adding disassembly of some more M88K load/store instructions.
		Implementing some relatively simple M88K instructions (br.n,
		xor[.u] imm, and[.u] imm).
20070505	Implementing M88K three-register and, or, xor, and jmp[.n],
		bsr[.n] including function call trace stuff.
		Applying a patch from Bruce M. Simpson which implements the
		SYSCON_BOARD_CPU_CLOCK_FREQ_ID object of the syscon call in
		the yamon PROM emulation.
20070506	Implementing M88K bb0[.n] and bb1[.n], and skeletons for
		ldcr and stcr (although no control regs are implemented yet).
20070509	Found and fixed the bug which caused Linux for QEMU_MIPS to
		stop working in 0.4.5.1: It was a faulty change to the MIPS
		'sc' and 'scd' instructions I made while going through gcc -W
		warnings on 20070428.
20070510	Updating the Linux/QEMU_MIPS section in guestoses.html to
		use mips-test-0.2.tar.gz instead of 0.1.
		A big thank you to Miod Vallat for sending me M88K manuals.
		Implementing more M88K instructions (addu, subu, div[u], mulu,
		ext[u], clr, set, cmp).
20070511	Fixing bugs in the M88K "and" and "and.u" instructions (found
		by comparing against the manual).
		Implementing more M88K instructions (mask[.u], mak, bcnd (auto-
		generated)) and some more control register details.
		Cleanup: Removing the experimental AVR emulation mode and
		corresponding devices; AVR emulation wasn't really meaningful.
		Implementing autogeneration of most M88K loads/stores. The
		rectangle drawing demo (with -O0) for M88K runs :-)
		Beginning on M88K exception handling.
		More M88K instructions: tb0, tb1, rte, sub, jsr[.n].
		Adding some skeleton MVME PROM ("BUG") emulation.
20070512	Fixing a bug in the M88K cmp instruction.
		Adding the M88K lda (scaled register) instruction.
		Fixing bugs in 64-bit (32-bit pairs) M88K loads/stores.
		Removing the unused tick_hz stuff from the machine struct.
		Implementing the M88K xmem instruction. OpenBSD/mvme88k gets
		far enough to display the Copyright banner :-)
		Implementing subu.co (guess), addu.co, addu.ci, ff0, and ff1.
		Adding a dev_mvme187, for MVME187-specific devices/registers.
		OpenBSD/mvme88k prints more boot messages. :)
20070515	Continuing on MVME187 emulation (adding more devices, beginning
		on the CMMUs, etc).
		Adding the M88K and.c, xor.c, and or.c instructions, and making
		sure that mul, div, etc cause exceptions if executed when SFD1
		is disabled.
20070517	Continuing on M88K and MVME187 emulation in general; moving
		the CMMU registers to the CPU struct, separating dev_pcc2 from
		dev_mvme187, and beginning on memory_m88k.c (BATC and PATC).
		Fixing a bug in 64-bit (32-bit pairs) M88K fast stores.
		Implementing the clock part of dev_mk48txx.
		Implementing the M88K fstcr and xcr instructions.
		Implementing m88k_cpu_tlbdump().
		Beginning on the implementation of a separate address space
		for M88K .usr loads/stores.
20070520	Removing the non-working (skeleton) Sandpoint, SonyNEWS, SHARK
		Dnard, and Zaurus machine modes.
		Experimenting with dyntrans to_be_translated read-ahead. It
		seems to give a very small performance increase for MIPS
		emulation, but a large performance degradation for SuperH. Hm.
20070522	Disabling correct SuperH ITLB emulation; it does not seem to be
		necessary in order to let SH4 guest OSes run, and it slows down
		userspace code.
		Implementing "samepage" branches for SuperH emulation, and some
		other minor speed hacks.
20070525	Continuing on M88K memory-related stuff: exceptions, memory
		transaction register contents, etc.
		Implementing the M88K subu.ci instruction.
		Removing the non-working (skeleton) Iyonix machine mode.
		OpenBSD/mvme88k reaches userland :-), starts executing
		/sbin/init's instructions, and issues a few syscalls, before
		crashing.
20070526	Fixing bugs in dev_mk48txx, so that OpenBSD/mvme88k detects
		the correct time-of-day.
		Implementing a generic IRQ controller for the test machines
		(dev_irqc), similar to a proposed patch from Petr Stepan.
		Experimenting some more with translation read-ahead.
		Adding an "expect" script for automated OpenBSD/landisk
		install regression/performance tests.
20070527	Adding a dummy mmEye (SH3) machine mode skeleton.
		FINALLY found the strange M88K bug I have been hunting: I had
		not emulated the SNIP value for exceptions occurring in
		branch delay slots correctly.
		Implementing correct exceptions for 64-bit M88K loads/stores.
		Address to symbol lookups are now disabled when M88K is
		running in usermode (because usermode addresses don't have
		anything to do with supervisor addresses).
20070531	Removing the mmEye machine mode skeleton.
20070604	Some minor code cleanup.
20070605	Moving src/useremul.c into a subdir (src/useremul/), and
		cleaning up some more legacy constructs.
		Adding -Wstrict-aliasing and -fstrict-aliasing detection to
		the configure script.
20070606	Adding a check for broken GCC on Solaris to the configure
		script. (GCC 3.4.3 on Solaris cannot handle static variables
		which are initialized to 0 or NULL. :-/)
		Removing the old (non-working) ARC emulation modes: NEC RD94,
		R94, R96, and R98, and the last traces of Olivetti M700 and
		Deskstation Tyne.
		Removing the non-working skeleton WDSC device (dev_wdsc).
20070607	Thinking about how to use the host's cc + ld at runtime to
		generate native code. (See experiments/native_cc_ld_test.i
		for an example.)
20070608	Adding a program counter sampling timer, which could be useful
		for native code generation experiments.
		The KN02_CSR_NRMMOD bit in the DECstation 5000/200 (KN02) CSR
		should always be set, to allow a 5000/200 PROM to boot.
20070609	Moving out breakpoint details from the machine struct into
		a helper struct, and removing the limit on max nr of
		breakpoints.
20070610	Moving out tick functions into a helper struct as well (which
		also gets rid of the max limit).
20070612	FINALLY figured out why Debian/DECstation stopped working when
		translation read-ahead was enabled: in src/memory_rw.c, the
		call to invalidate_code_translation was made also if the
		memory access was an instruction load (if the page was mapped
		as writable); it shouldn't be called in that case.
20070613	Implementing some more MIPS32/64 revision 2 instructions: di,
		ei, ext, dext, dextm, dextu, and ins.
20070614	Implementing an instruction combination for the NetBSD/arm
		idle loop (making the host not use any cpu if NetBSD/arm
		inside the emulator is not using any cpu).
		Increasing the nr of ARM VPH entries from 128 to 384.
20070615	Removing the ENABLE_arch stuff from the configure script, so
		that all included architectures are included in both release
		and development builds.
		Moving memory related helper functions from misc.c to memory.c.
		Adding preliminary instructions for netbooting NetBSD/pmppc to
		guestoses.html; it doesn't work yet, there are weird timeouts.
		Beginning a total rewrite of the userland emulation modes
		(removing all emulation modes, beginning from scratch with
		NetBSD/MIPS and FreeBSD/Alpha only).
20070616	After fixing a bug in the DEC21143 NIC (the TDSTAT_OWN bit was
		only cleared for the last segment when transmitting, not all
		segments), NetBSD/pmppc boots with root-on-nfs without the
		timeouts. Updating guestoses.html.
		Removing the skeleton PSP (Playstation Portable) mode.
		Moving X11-related stuff in the machine struct into a helper
		struct.
		Cleanup of out-of-memory checks, to use a new CHECK_ALLOCATION
		macro (which prints a meaningful error message).
		Adding a COMMENT to each machine and device (for automagic
		.index comment generation).
		Doing regression testing for the next release.

==============  RELEASE 0.4.6  ==============
1 dpavlin 42 /*
2     * Copyright (C) 2007 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: memory_m88k.c,v 1.8 2007/05/25 11:51:36 debug Exp $
29     *
30     * Virtual to physical memory translation for M88K emulation.
31     *
32     * (This is where the actual work of the M8820x chips is emulated.)
33     *
34     *
35     * TODO:
36     * M88204 stuff, where it differs from the M88200.
37     */
38    
39     #include <stdio.h>
40     #include <stdlib.h>
41     #include <string.h>
42    
43     #include "cpu.h"
44     #include "machine.h"
45     #include "memory.h"
46     #include "misc.h"
47    
48    
49     #include "m8820x.h"
50     #include "m8820x_pte.h"
51    
52    
53     /* #define M8820X_TABLE_SEARCH_DEBUG */
54    
55    
56     /*
57     * m8820x_mark_page_as_modified():
58     *
59     * Helper function which traverses the page table structure in emulated
60     * memory, and marks a page as Modified and Used.
61     */
62     void m8820x_mark_page_as_modified(struct cpu *cpu,
63     struct m8820x_cmmu *cmmu, uint32_t apr, uint32_t vaddr)
64     {
65     int seg_nr = vaddr >> 22, page_nr = (vaddr >> 12) & 0x3ff;
66     uint32_t *seg_base, *page_base;
67     sdt_entry_t seg_descriptor;
68     pt_entry_t page_descriptor;
69    
70     /* Read the segment descriptor from memory: */
71     seg_base = (uint32_t *) memory_paddr_to_hostaddr(
72     cpu->mem, apr & 0xfffff000, 1);
73     seg_descriptor = seg_base[seg_nr];
74     if (cpu->byte_order == EMUL_LITTLE_ENDIAN)
75     seg_descriptor = LE32_TO_HOST(seg_descriptor);
76     else
77     seg_descriptor = BE32_TO_HOST(seg_descriptor);
78    
79     /* ... and the page descriptor: */
80     page_base = (uint32_t *) memory_paddr_to_hostaddr(
81     cpu->mem, seg_descriptor & 0xfffff000, 1);
82     page_descriptor = page_base[page_nr];
83     if (cpu->byte_order == EMUL_LITTLE_ENDIAN)
84     page_descriptor = LE32_TO_HOST(page_descriptor);
85     else
86     page_descriptor = BE32_TO_HOST(page_descriptor);
87    
88     /* ... set the Modified and Used bits: */
89     page_descriptor |= PG_M | PG_U;
90    
91     /* ... and write it back: */
92     if (cpu->byte_order == EMUL_LITTLE_ENDIAN)
93     page_descriptor = LE32_TO_HOST(page_descriptor);
94     else
95     page_descriptor = BE32_TO_HOST(page_descriptor);
96     page_base[page_nr] = page_descriptor;
97     }
98    
99    
100     /*
101     * m88k_translate_v2p():
102     *
103     * Returns 0 for translation failure (access denied), 1 for read access
104     * (success), or 2 for read/write access (success).
105     */
106     int m88k_translate_v2p(struct cpu *cpu, uint64_t vaddr64,
107     uint64_t *return_paddr, int flags)
108     {
109     int instr = flags & FLAG_INSTR;
110     int writeflag = (flags & FLAG_WRITEFLAG)? 1 : 0;
111     int no_exceptions = flags & FLAG_NOEXCEPTIONS;
112     int exception_type = instr? M88K_EXCEPTION_INSTRUCTION_ACCESS
113     : M88K_EXCEPTION_DATA_ACCESS;
114     int supervisor = cpu->cd.m88k.cr[M88K_CR_PSR] & M88K_PSR_MODE;
115     struct m8820x_cmmu *cmmu = cpu->cd.m88k.cmmu[instr? 0 : 1];
116     uint32_t vaddr = vaddr64;
117     uint32_t apr;
118     uint32_t *seg_base, *page_base;
119     sdt_entry_t seg_descriptor;
120     pt_entry_t page_descriptor;
121     int pfsr_status = CMMU_PFSR_SUCCESS;
122     uint32_t pfar = 0;
123     int accumulated_flags;
124     int i, seg_nr = vaddr >> 22, page_nr = (vaddr >> 12) & 0x3ff;
125    
126     if (flags & MEMORY_USER_ACCESS)
127     supervisor = 0;
128    
129    
130     /*
131     * Is the CMMU not yet initialized? Then return physical = virtual.
132     */
133     *return_paddr = vaddr;
134     if (cmmu == NULL)
135     return 2;
136    
137     if (supervisor)
138     apr = cmmu->reg[CMMU_SAPR];
139     else
140     apr = cmmu->reg[CMMU_UAPR];
141    
142    
143     /*
144     * Address translation not enabled? Then return physical = virtual.
145     */
146     if (!(apr & APR_V))
147     return 2;
148    
149     /*
150     * BATC lookup:
151     *
152     * The BATC is a 10-entry array of virtual to physical mappings,
153     * where the top 13 bits of the virtual address must match.
154     */
155     for (i=0; i<N_M88200_BATC_REGS; i++) {
156     uint32_t batc = cmmu->batc[i];
157    
158     /* The batc entry must be valid: */
159     if (!(batc & BATC_V))
160     continue;
161    
162     /* ... and have a matching supervisor/user bit: */
163     if ((supervisor && !(batc & BATC_SO)) ||
164     (!supervisor && (batc & BATC_SO)))
165     continue;
166    
167     /* ... and matching virtual address: */
168     if ((vaddr & 0xfff80000) != (batc & 0xfff80000))
169     continue;
170    
171     /* A matching BATC entry was found! */
172    
173     /* Is it write protected? */
174     if ((batc & BATC_PROT) && writeflag) {
175     pfsr_status = CMMU_PFSR_WRITE;
176     goto exception;
177     }
178    
179     *return_paddr = ((batc & 0x0007ffc0) << 13)
180     | (vaddr & 0x0007ffff);
181    
182     return batc & BATC_PROT? 1 : 2;
183     }
184    
185     /*
186     * PATC lookup:
187     *
188     * The PATC is a 56-entry array of virtual to physical mappings for
189     * 4 KB pages. If writeflag is set, and a PATC entry is found without
190     * the Modified bit set, a page table search must be performed to
191     * set the Modified bit in emulated memory.
192     */
193     for (i=0; i<N_M88200_PATC_ENTRIES; i++) {
194     uint32_t vaddr_and_control = cmmu->patc_v_and_control[i];
195     uint32_t paddr_and_sbit = cmmu->patc_p_and_supervisorbit[i];
196    
197     /* Skip this entry if the valid bit isn't set: */
198     if (!(vaddr_and_control & PG_V))
199     continue;
200    
201     /* ... or the virtual addresses don't match: */
202     if ((vaddr & 0xfffff000) != (vaddr_and_control & 0xfffff000))
203     continue;
204    
205     /* ... or if the supervisor bit doesn't match: */
206     if (((paddr_and_sbit & M8820X_PATC_SUPERVISOR_BIT)
207     && !supervisor) || (supervisor &&
208     !(paddr_and_sbit & M8820X_PATC_SUPERVISOR_BIT)))
209     continue;
210    
211     /* A matching PATC entry was found! */
212    
213     /* Is it write protected? */
214     if ((vaddr_and_control & PG_PROT) && writeflag) {
215     pfsr_status = CMMU_PFSR_WRITE;
216     goto exception;
217     }
218    
219     /* On writes: Is the page not yet marked as modified? */
220     if (!(vaddr_and_control & PG_M) && writeflag &&
221     !no_exceptions) {
222     /* Then perform a page table search and mark
223     it as Modified (and used): */
224     m8820x_mark_page_as_modified(cpu, cmmu, apr, vaddr);
225    
226     /* ... and mark the PATC entry too: */
227     cmmu->patc_v_and_control[i] |= PG_M;
228     }
229    
230     /* Set the Used bit of the PATC entry: */
231     if (!no_exceptions)
232     cmmu->patc_v_and_control[i] |= PG_U;
233    
234     /* ... and finally return the physical address: */
235     *return_paddr = (paddr_and_sbit & 0xfffff000) | (vaddr & 0xfff);
236     return vaddr_and_control & PG_PROT? 1 : 2;
237     }
238    
239     /*
240     * The address was neither found in the BATC, nor the PATC.
241     */
242    
243     /*
244     * Attempt a search through page tables, to refill the PATC:
245     */
246     seg_base = (uint32_t *) memory_paddr_to_hostaddr(
247     cpu->mem, apr & 0xfffff000, 1);
248    
249     seg_descriptor = seg_base[seg_nr];
250     if (cpu->byte_order == EMUL_LITTLE_ENDIAN)
251     seg_descriptor = LE32_TO_HOST(seg_descriptor);
252     else
253     seg_descriptor = BE32_TO_HOST(seg_descriptor);
254    
255     #ifdef M8820X_TABLE_SEARCH_DEBUG
256     printf("+--- M8820x page table search debug:\n");
257     printf("| vaddr 0x%08"PRIx32"\n", vaddr);
258     printf("| apr 0x%08"PRIx32"\n", apr);
259     printf("| seg_base %p (on the host)\n", seg_base);
260     printf("| seg_nr 0x%03x\n", seg_nr);
261     printf("| page_nr 0x%03x\n", page_nr);
262     printf("| sd 0x%08"PRIx32"\n", seg_descriptor);
263     #endif
264    
265     /* Segment descriptor invalid? Then cause a segfault exception. */
266     if (!(seg_descriptor & SG_V)) {
267     /* PFAR = physical address of faulting segment descriptor: */
268     pfar = (apr & 0xfffff000) + seg_nr * sizeof(uint32_t);
269     pfsr_status = CMMU_PFSR_SFAULT;
270     goto exception;
271     }
272    
273     /* Usermode attempted to access a supervisor segment? */
274     if ((seg_descriptor & SG_SO) && !supervisor) {
275     /* PFAR = physical address of faulting segment descriptor: */
276     pfar = (apr & 0xfffff000) + seg_nr * sizeof(uint32_t);
277     pfsr_status = CMMU_PFSR_SUPER;
278     goto exception;
279     }
280    
281     accumulated_flags = seg_descriptor & SG_RO;
282    
283     page_base = (uint32_t *) memory_paddr_to_hostaddr(
284     cpu->mem, seg_descriptor & 0xfffff000, 1);
285    
286     page_descriptor = page_base[page_nr];
287     if (cpu->byte_order == EMUL_LITTLE_ENDIAN)
288     page_descriptor = LE32_TO_HOST(page_descriptor);
289     else
290     page_descriptor = BE32_TO_HOST(page_descriptor);
291    
292     #ifdef M8820X_TABLE_SEARCH_DEBUG
293     printf("| page_base %p (on the host)\n", page_base);
294     printf("| pd 0x%08"PRIx32"\n", page_descriptor);
295     #endif
296    
297     /* Page descriptor invalid? Then cause a page fault exception. */
298     if (!(page_descriptor & PG_V)) {
299     /* PFAR = physical address of faulting page descriptor: */
300     pfar = (seg_descriptor & 0xfffff000)
301     + page_nr * sizeof(uint32_t);
302     pfsr_status = CMMU_PFSR_PFAULT;
303     goto exception;
304     }
305    
306     /* Usermode attempted to access a supervisor page? */
307     if ((page_descriptor & PG_SO) && !supervisor) {
308     /* PFAR = physical address of faulting page descriptor: */
309     pfar = (seg_descriptor & 0xfffff000)
310     + page_nr * sizeof(uint32_t);
311     pfsr_status = CMMU_PFSR_SUPER;
312     goto exception;
313     }
314    
315     accumulated_flags |= (page_descriptor & PG_RO);
316    
317    
318     /*
319     * Overwrite the next entry in the PATC with a new entry:
320     */
321    
322     if (!no_exceptions) {
323     i = cmmu->patc_update_index;
324    
325     /* Invalidate the current entry, if it is valid: */
326     if (cmmu->patc_v_and_control[i] & PG_V)
327     cpu->invalidate_translation_caches(cpu,
328     cmmu->patc_v_and_control[i] & 0xfffff000,
329     INVALIDATE_VADDR);
330    
331     /* ... and write the new one: */
332     cmmu->patc_update_index ++;
333     cmmu->patc_update_index %= N_M88200_PATC_ENTRIES;
334     cmmu->patc_v_and_control[i] =
335     (vaddr & 0xfffff000) | accumulated_flags | PG_V;
336     cmmu->patc_p_and_supervisorbit[i] =
337     (page_descriptor & 0xfffff000) |
338     (supervisor? M8820X_PATC_SUPERVISOR_BIT : 0);
339     }
340    
341     /* Check for writes to read-only pages: */
342     if (writeflag && (accumulated_flags & PG_RO)) {
343     pfsr_status = CMMU_PFSR_WRITE;
344     goto exception;
345     }
346    
347     if (!no_exceptions) {
348     uint32_t tmp;
349    
350     /* We now know that the page is in use. */
351     cmmu->patc_v_and_control[i] |= PG_U;
352     if (writeflag)
353     cmmu->patc_v_and_control[i] |= PG_M;
354    
355     /*
356     * Write back the U bit (and possibly the M bit) to the page
357     * descriptor in emulated memory:
358     */
359     tmp = page_descriptor | PG_U;
360     if (writeflag)
361     tmp |= PG_M;
362    
363     if (cpu->byte_order == EMUL_LITTLE_ENDIAN)
364     tmp = LE32_TO_HOST(tmp);
365     else
366     tmp = BE32_TO_HOST(tmp);
367    
368     page_base[page_nr] = tmp;
369     }
370    
371     /* Now finally return with the translated page address: */
372     *return_paddr = (page_descriptor & 0xfffff000) | (vaddr & 0xfff);
373     return (accumulated_flags & PG_RO)? 1 : 2;
374    
375    
376     exception:
377     if (no_exceptions)
378     return 0;
379    
380     /*
381     * Update the Page Fault Status Register of the CMMU which this fault
382     * was associated with, but also clear the PFSR of the _other_ CMMU:
383     */
384    
385     cmmu->reg[CMMU_PFSR] = pfsr_status << 16;
386     cpu->cd.m88k.cmmu[instr? 1 : 0]->reg[CMMU_PFSR] =
387     CMMU_PFSR_SUCCESS << 16;
388    
389     /* ... and (if necessary) update the Page Fault Address Register: */
390    
391     switch (pfsr_status) {
392    
393     case CMMU_PFSR_SUCCESS:
394     break;
395    
396     case CMMU_PFSR_WRITE:
397     /* Note: The PFAR is "destroyed"/undefined on write faults. */
398     cmmu->reg[CMMU_PFAR] = 0;
399     break;
400    
401     case CMMU_PFSR_SUPER:
402     case CMMU_PFSR_SFAULT:
403     case CMMU_PFSR_PFAULT:
404     cmmu->reg[CMMU_PFAR] = pfar;
405     break;
406    
407     default:
408     fatal("Internal error in memory_m88k? pfsr_status = %i\n",
409     pfsr_status);
410     exit(1);
411     }
412    
413     /* ... and finally cause the exception: */
414     m88k_exception(cpu, exception_type, 0);
415    
416     return 0;
417     }
418    
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