/[gxemul]/trunk/src/cpus/cpu_rca180x_instr.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_rca180x_instr.c

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Revision 32 - (hide annotations)
Mon Oct 8 16:20:58 2007 UTC (13 years, 1 month ago) by dpavlin
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File size: 15462 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1421 2006/11/06 05:32:37 debug Exp $
20060816	Adding a framework for emulated/virtual timers (src/timer.c),
		using only setitimer().
		Rewriting the mc146818 to use the new timer framework.
20060817	Adding a call to gettimeofday() every now and then (once every
		second, at the moment) to resynch the timer if it drifts.
		Beginning to convert the ISA timer interrupt mechanism (8253
		and 8259) to use the new timer framework.
		Removing the -I command line option.
20060819	Adding the -I command line option again, with new semantics.
		Working on Footbridge timer interrupts; NetBSD/NetWinder and
		NetBSD/CATS now run at correct speed, but unfortunately with
		HUGE delays during bootup.
20060821	Some minor m68k updates. Adding the first instruction: nop. :)
		Minor Alpha emulation updates.
20060822	Adding a FreeBSD development specific YAMON environment
		variable ("khz") (as suggested by Bruce M. Simpson).
		Moving YAMON environment variable initialization from
		machine_evbmips.c into promemul/yamon.c, and adding some more
		variables.
		Continuing on the LCA PCI bus controller (for Alpha machines).
20060823	Continuing on the timer stuff: experimenting with MIPS count/
		compare interrupts connected to the timer framework.
20060825	Adding bogus SCSI commands 0x51 (SCSICDROM_READ_DISCINFO) and
		0x52 (SCSICDROM_READ_TRACKINFO) to the SCSI emulation layer,
		to allow NetBSD/pmax 4.0_BETA to be installed from CDROM.
		Minor updates to the LCA PCI controller.
20060827	Implementing a CHIP8 cpu mode, and a corresponding CHIP8
		machine, for fun. Disassembly support for all instructions,
		and most of the common instructions have been implemented: mvi,
		mov_imm, add_imm, jmp, rand, cls, sprite, skeq_imm, jsr,
		skne_imm, bcd, rts, ldr, str, mov, or, and, xor, add, sub,
		font, ssound, sdelay, gdelay, bogus skup/skpr, skeq, skne.
20060828	Beginning to convert the CHIP8 cpu in the CHIP8 machine to a
		(more correct) RCA 180x cpu. (Disassembly for all 1802
		instructions has been implemented, but no execution yet, and
		no 1805 extended instructions.)
20060829	Minor Alpha emulation updates.
20060830	Beginning to experiment a little with PCI IDE for SGI O2.
		Fixing the cursor key mappings for MobilePro 770 emulation.
		Fixing the LK201 warning caused by recent NetBSD/pmax.
		The MIPS R41xx standby, suspend, and hibernate instructions now
		behave like the RM52xx/MIPS32/MIPS64 wait instruction.
		Fixing dev_wdc so it calculates correct (64-bit) offsets before
		giving them to diskimage_access().
20060831	Continuing on Alpha emulation (OSF1 PALcode).
20060901	Minor Alpha updates; beginning on virtual memory pagetables.
		Removed the limit for max nr of devices (in preparation for
		allowing devices' base addresses to be changed during runtime).
		Adding a hack for MIPS [d]mfc0 select 0 (except the count
		register), so that the coproc register is simply copied.
		The MIPS suspend instruction now exits the emulator, instead
		of being treated as a wait instruction (this causes NetBSD/
		hpcmips to get correct 'halt' behavior).
		The VR41xx RTC now returns correct time.
		Connecting the VR41xx timer to the timer framework (fixed at
		128 Hz, for now).
		Continuing on SPARC emulation, adding more instructions:
		restore, ba_xcc, ble. The rectangle drawing demo works :)
		Removing the last traces of the old ENABLE_CACHE_EMULATION
		MIPS stuff (not usable with dyntrans anyway).
20060902	Splitting up src/net.c into several smaller files in its own
		subdirectory (src/net/).
20060903	Cleanup of the files in src/net/, to make them less ugly.
20060904	Continuing on the 'settings' subsystem.
		Minor progress on the SPARC emulation mode.
20060905	Cleanup of various things, and connecting the settings
		infrastructure to various subsystems (emul, machine, cpu, etc).
		Changing the lk201 mouse update routine to not rely on any
		emulated hardware framebuffer cursor coordinates, but instead
		always do (semi-usable) relative movements.
20060906	Continuing on the lk201 mouse stuff. Mouse behaviour with
		multiple framebuffers (which was working in Ultrix) is now
		semi-broken (but it still works, in a way).
		Moving the documentation about networking into its own file
		(networking.html), and refreshing it a bit. Adding an example
		of how to use ethernet frame direct-access (udp_snoop).
20060907	Continuing on the settings infrastructure.
20060908	Minor updates to SH emulation: for 32-bit emulation: delay
		slots and the 'jsr @Rn' instruction. I'm putting 64-bit SH5 on
		ice, for now.
20060909-10	Implementing some more 32-bit SH instructions. Removing the
		64-bit mode completely. Enough has now been implemented to run
		the rectangle drawing demo. :-)
20060912	Adding more SH instructions.
20060916	Continuing on SH emulation (some more instructions: div0u,
		div1, rotcl/rotcr, more mov instructions, dt, braf, sets, sett,
		tst_imm, dmuls.l, subc, ldc_rm_vbr, movt, clrt, clrs, clrmac).
		Continuing on the settings subsystem (beginning on reading/
		writing settings, removing bugs, and connecting more cpus to
		the framework).
20060919	More work on SH emulation; adding an ldc banked instruction,
		and attaching a 640x480 framebuffer to the Dreamcast machine
		mode (NetBSD/dreamcast prints the NetBSD copyright banner :-),
		and then panics).
20060920	Continuing on the settings subsystem.
20060921	Fixing the Footbridge timer stuff so that NetBSD/cats and
		NetBSD/netwinder boot up without the delays.
20060922	Temporarily hardcoding MIPS timer interrupt to 100 Hz. With
		'wait' support disabled, NetBSD/malta and Linux/malta run at
		correct speed.
20060923	Connecting dev_gt to the timer framework, so that NetBSD/cobalt
		runs at correct speed.
		Moving SH4-specific memory mapped registers into its own
		device (dev_sh4.c).
		Running with -N now prints "idling" instead of bogus nr of
		instrs/second (which isn't valid anyway) while idling.
20060924	Algor emulation should now run at correct speed.
		Adding disassembly support for some MIPS64 revision 2
		instructions: ext, dext, dextm, dextu.
20060926	The timer framework now works also when the MIPS wait
		instruction is used.
20060928	Re-implementing checks for coprocessor availability for MIPS
		cop0 instructions. (Thanks to Carl van Schaik for noticing the
		lack of cop0 availability checks.)
20060929	Implementing an instruction combination hack which treats
		NetBSD/pmax' idle loop as a wait-like instruction.
20060930	The ENTRYHI_R_MASK was missing in (at least) memory_mips_v2p.c,
		causing TLB lookups to sometimes succeed when they should have
		failed. (A big thank you to Juli Mallett for noticing the
		problem.)
		Adding disassembly support for more MIPS64 revision 2 opcodes
		(seb, seh, wsbh, jalr.hb, jr.hb, synci, ins, dins, dinsu,
		dinsm, dsbh, dshd, ror, dror, rorv, drorv, dror32). Also
		implementing seb, seh, dsbh, dshd, and wsbh.
		Implementing an instruction combination hack for Linux/pmax'
		idle loop, similar to the NetBSD/pmax case.
20061001	Changing the NetBSD/sgimips install instructions to extract
		files from an iso image, instead of downloading them via ftp.
20061002	More-than-31-bit userland addresses in memory_mips_v2p.c were
		not actually working; applying a fix from Carl van Schaik to
		enable them to work + making some other updates (adding kuseg
		support).
		Fixing hpcmips (vr41xx) timer initialization.
		Experimenting with O(n)->O(1) reduction in the MIPS TLB lookup
		loop. Seems to work both for R3000 and non-R3000.
20061003	Continuing a little on SH emulation (adding more control
		registers; mini-cleanup of memory_sh.c).
20061004	Beginning on a dev_rtc, a clock/timer device for the test
		machines; also adding a demo, and some documentation.
		Fixing a bug in SH "mov.w @(disp,pc),Rn" (the result wasn't
		sign-extended), and adding the addc and ldtlb instructions.
20061005	Contining on SH emulation: virtual to physical address
		translation, and a skeleton exception mechanism.
20061006	Adding more SH instructions (various loads and stores, rte,
		negc, muls.w, various privileged register-move instructions).
20061007	More SH instructions: various move instructions, trapa, div0s,
		float, fdiv, ftrc.
		Continuing on dev_rtc; removing the rtc demo.
20061008	Adding a dummy Dreamcast PROM module. (Homebrew Dreamcast
		programs using KOS libs need this.)
		Adding more SH instructions: "stc vbr,rn", rotl, rotr, fsca,
		fmul, fadd, various floating-point moves, etc. A 256-byte
		demo for Dreamcast runs :-)
20061012	Adding the SH "lds Rm,pr" and bsr instructions.
20061013	More SH instructions: "sts fpscr,rn", tas.b, and some more
		floating point instructions, cmp/str, and more moves.
		Adding a dummy dev_pvr (Dreamcast graphics controller).
20061014	Generalizing the expression evaluator (used in the built-in
		debugger) to support parentheses and +-*/%^&|.
20061015	Removing the experimental tlb index hint code in
		mips_memory_v2p.c, since it didn't really have any effect.
20061017	Minor SH updates; adding the "sts pr,Rn", fcmp/gt, fneg,
		frchg, and some other instructions. Fixing missing sign-
		extension in an 8-bit load instruction.
20061019	Adding a simple dev_dreamcast_rtc.
		Implementing memory-mapped access to the SH ITLB/UTLB arrays.
20061021	Continuing on various SH and Dreamcast things: sh4 timers,
		debug messages for dev_pvr, fixing some virtual address
		translation bugs, adding the bsrf instruction.
		The NetBSD/dreamcast GENERIC_MD kernel now reaches userland :)
		Adding a dummy dev_dreamcast_asic.c (not really useful yet).
		Implementing simple support for Store Queues.
		Beginning on the PVR Tile Accelerator.
20061022	Generalizing the PVR framebuffer to support off-screen drawing,
		multiple bit-depths, etc. (A small speed penalty, but most
		likely worth it.)
		Adding more SH instructions (mulu.w, fcmp/eq, fsub, fmac,
		fschg, and some more); correcting bugs in "fsca" and "float".
20061024	Adding the SH ftrv (matrix * vector) instruction. Marcus
		Comstedt's "tatest" example runs :) (wireframe only).
		Correcting disassembly for SH floating point instructions that
		use the xd* registers.
		Adding the SH fsts instruction.
		In memory_device_dyntrans_access(), only the currently used
		range is now invalidated, and not the entire device range.
20061025	Adding a dummy AVR32 cpu mode skeleton.
20061026	Various Dreamcast updates; beginning on a Maple bus controller.
20061027	Continuing on the Maple bus. A bogus Controller, Keyboard, and
		Mouse can now be detected by NetBSD and KOS homebrew programs.
		Cleaning up the SH4 Timer Management Unit, and beginning on
		SH4 interrupts.
		Implementing the Dreamcast SYSASIC.
20061028	Continuing on the SYSASIC.
		Adding the SH fsqrt instruction.
		memory_sh.c now actually scans the ITLB.
		Fixing a bug in dev_sh4.c, related to associative writes into
		the memory-mapped UTLB array. NetBSD/dreamcast now reaches
		userland stably, and prints the "Terminal type?" message :-]
		Implementing enough of the Dreamcast keyboard to make NetBSD
		accept it for input.
		Enabling SuperH for stable (non-development) builds.
		Adding NetBSD/dreamcast to the documentation, although it
		doesn't support root-on-nfs yet.
20061029	Changing usleep(1) calls in the debugger to to usleep(10000)
		(according to Brian Foley, this makes GXemul run better on
		MacOS X).
		Making the Maple "Controller" do something (enough to barely
		interact with dcircus.elf).
20061030-31	Some progress on the PVR. More test programs start running (but
		with strange output).
		Various other SH4-related updates.
20061102	Various Dreamcast and SH4 updates; more KOS demos run now.
20061104	Adding a skeleton dev_mb8696x.c (the Dreamcast's LAN adapter).
20061105	Continuing on the MB8696x; NetBSD/dreamcast detects it as mbe0.
		Testing for the release.

==============  RELEASE 0.4.3  ==============


1 dpavlin 32 /*
2     * Copyright (C) 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_rca180x_instr.c,v 1.1 2006/08/28 16:25:59 debug Exp $
29     *
30     * RCA180X instructions.
31     *
32     * See http://www.elf-emulation.com/1802.html for a good list of 1802/1805
33     * opcodes.
34     *
35     * Individual functions should keep track of cpu->n_translated_instrs.
36     * (n_translated_instrs is automatically increased by 1 for each function
37     * call. If no instruction was executed, then it should be decreased. If, say,
38     * 4 instructions were combined into one function and executed, then it should
39     * be increased by 3.)
40     *
41     * NOTE/TODO: This file still contains CHIP8 instructions only...
42     */
43    
44    
45     /*****************************************************************************/
46    
47    
48     static void rca180x_putpixel(struct cpu *cpu, int x, int y, int color)
49     {
50     /* TODO: Optimize. */
51     int sx, sy;
52     uint8_t pixel = color? 255 : 0;
53     int linelen = cpu->cd.rca180x.xres;
54     uint64_t addr = (linelen * y * cpu->machine->x11_scaleup + x)
55     * cpu->machine->x11_scaleup + CHIP8_FB_ADDR;
56    
57     cpu->cd.rca180x.framebuffer_cache[y * cpu->cd.rca180x.xres + x] = pixel;
58    
59     linelen = (linelen - 1) * cpu->machine->x11_scaleup;
60    
61     for (sy=0; sy<cpu->machine->x11_scaleup; sy++) {
62     for (sx=0; sx<cpu->machine->x11_scaleup; sx++) {
63     cpu->memory_rw(cpu, cpu->mem, addr, &pixel,
64     sizeof(pixel), MEM_WRITE, PHYSICAL);
65     addr ++;
66     }
67     addr += linelen;
68     }
69     }
70    
71    
72     /*
73     * cls: Clear screen.
74     */
75     X(cls)
76     {
77     /* TODO: Optimize. */
78     int x, y;
79     for (y=0; y<cpu->cd.rca180x.yres; y++)
80     for (x=0; x<cpu->cd.rca180x.xres; x++)
81     rca180x_putpixel(cpu, x, y, 0);
82     }
83    
84    
85     /*
86     * sprite: Draw a 8 pixel wide sprite.
87     *
88     * arg[0] = ptr to register containing x coordinate
89     * arg[1] = ptr to register containing y coordinate
90     * arg[2] = height
91     */
92     X(sprite)
93     {
94     int xb = *((uint8_t *)ic->arg[0]), yb = *((uint8_t *)ic->arg[1]);
95     int x, y, height = ic->arg[2];
96     int index = cpu->cd.rca180x.index;
97    
98     /* Synchronize the PC first: */
99     int low_pc = ((size_t)ic - (size_t)cpu->cd.rca180x.cur_ic_page)
100     / sizeof(struct rca180x_instr_call);
101     cpu->pc &= ~((RCA180X_IC_ENTRIES_PER_PAGE-1)
102     << RCA180X_INSTR_ALIGNMENT_SHIFT);
103     cpu->pc += (low_pc << RCA180X_INSTR_ALIGNMENT_SHIFT);
104    
105     /* debug("[ rca180x sprite at x=%i y=%i, height=%i ]\n",
106     xb, yb, height); */
107     cpu->cd.rca180x.v[15] = 0;
108    
109     for (y=yb; y<yb+height; y++) {
110     uint8_t color;
111     cpu->memory_rw(cpu, cpu->mem, index++, &color,
112     sizeof(color), MEM_READ, PHYSICAL);
113     for (x=xb; x<xb+8; x++) {
114     int xc = x % cpu->cd.rca180x.xres;
115     int yc = y % cpu->cd.rca180x.yres;
116     if (cpu->cd.rca180x.framebuffer_cache[yc *
117     cpu->cd.rca180x.xres + xc]) {
118     color ^= 0x80;
119     if ((color & 0x80) == 0)
120     cpu->cd.rca180x.v[15] = 1;
121     }
122     rca180x_putpixel(cpu, xc, yc, color & 0x80);
123     color <<= 1;
124     }
125     }
126    
127     cpu->n_translated_instrs += 200000;
128     cpu->pc += 2;
129     cpu->cd.rca180x.next_ic = &nothing_call;
130     }
131    
132    
133     /*
134     * mov: rx = ry
135     * or: rx = rx | ry
136     * and: rx = rx & ry
137     * xor: rx = rx ^ ry
138     * add: rx = rx + ry, vf set to 1 on carry overflow
139     * sub: rx = rx - ry, vf set to 1 on borrow
140     *
141     * arg[0] = ptr to register x
142     * arg[1] = ptr to register y
143     */
144     X(mov) { (*((uint8_t *)ic->arg[0])) = *((uint8_t *)ic->arg[1]); }
145     X(or) { (*((uint8_t *)ic->arg[0])) |= *((uint8_t *)ic->arg[1]); }
146     X(and) { (*((uint8_t *)ic->arg[0])) &= *((uint8_t *)ic->arg[1]); }
147     X(xor) { (*((uint8_t *)ic->arg[0])) ^= *((uint8_t *)ic->arg[1]); }
148     X(add)
149     {
150     int x = *((uint8_t *)ic->arg[0]);
151     int y = *((uint8_t *)ic->arg[1]);
152     x += y;
153     *((uint8_t *)ic->arg[0]) = x;
154     cpu->cd.rca180x.v[15] = (x > 255);
155     }
156     X(sub)
157     {
158     int x = *((uint8_t *)ic->arg[0]);
159     int y = *((uint8_t *)ic->arg[1]);
160     /* VF bit = negated borrow */
161     cpu->cd.rca180x.v[15] = (x >= y);
162     *((uint8_t *)ic->arg[0]) = x - y;
163     }
164    
165    
166     /*
167     * skeq_imm: Skip next instruction if a register is equal to a constant.
168     *
169     * arg[0] = ptr to register
170     * arg[1] = 8-bit constant
171     */
172     X(skeq_imm)
173     {
174     if (*((uint8_t *)ic->arg[0]) == ic->arg[1])
175     cpu->cd.rca180x.next_ic ++;
176     }
177    
178    
179     /*
180     * skne_imm: Skip next instruction if a register is not equal to a constant.
181     *
182     * arg[0] = ptr to register
183     * arg[1] = 8-bit constant
184     */
185     X(skne_imm)
186     {
187     if (*((uint8_t *)ic->arg[0]) != ic->arg[1])
188     cpu->cd.rca180x.next_ic ++;
189     }
190    
191    
192     /*
193     * skeq: Skip next instruction if a register is equal to another.
194     * skne: Skip next instruction if a register is not equal to another.
195     *
196     * arg[0] = ptr to register x
197     * arg[1] = ptr to register y
198     */
199     X(skeq)
200     {
201     if (*((uint8_t *)ic->arg[0]) == *((uint8_t *)ic->arg[1]))
202     cpu->cd.rca180x.next_ic ++;
203     }
204     X(skne)
205     {
206     if (*((uint8_t *)ic->arg[0]) != *((uint8_t *)ic->arg[1]))
207     cpu->cd.rca180x.next_ic ++;
208     }
209    
210    
211     /*
212     * mov_imm: Move constant to register.
213     *
214     * arg[0] = ptr to register
215     * arg[1] = 8-bit constant
216     */
217     X(mov_imm)
218     {
219     (*((uint8_t *)ic->arg[0])) = ic->arg[1];
220     }
221    
222    
223     /*
224     * jmp: Jump to a fixed addres (always on the same page).
225     *
226     * arg[0] = ptr to new instruction
227     */
228     X(jmp)
229     {
230     cpu->cd.rca180x.next_ic = (struct rca180x_instr_call *) ic->arg[0];
231     }
232    
233    
234     /*
235     * jsr: Jump to a subroutine at a fixed addres (always on the same page).
236     *
237     * arg[0] = ptr to new instruction
238     */
239     X(jsr)
240     {
241     uint16_t pc12;
242    
243     /* Synchronize the PC first: */
244     int low_pc = ((size_t)ic - (size_t)cpu->cd.rca180x.cur_ic_page)
245     / sizeof(struct rca180x_instr_call);
246     cpu->pc &= ~((RCA180X_IC_ENTRIES_PER_PAGE-1)
247     << RCA180X_INSTR_ALIGNMENT_SHIFT);
248     cpu->pc += (low_pc << RCA180X_INSTR_ALIGNMENT_SHIFT);
249     pc12 = (cpu->pc & 0xfff) + sizeof(uint16_t);
250    
251     /* Push return address to the stack: */
252     cpu->cd.rca180x.sp -= sizeof(uint16_t);
253     cpu->memory_rw(cpu, cpu->mem, cpu->cd.rca180x.sp, (unsigned char *)&pc12,
254     sizeof(pc12), MEM_WRITE, PHYSICAL);
255    
256     cpu->cd.rca180x.next_ic = (struct rca180x_instr_call *) ic->arg[0];
257     }
258    
259    
260     /*
261     * rts: Return from a subroutine.
262     */
263     X(rts)
264     {
265     uint16_t pc12;
266    
267     /* Pop return address to the stack: */
268     cpu->memory_rw(cpu, cpu->mem, cpu->cd.rca180x.sp, (unsigned char *)&pc12,
269     sizeof(pc12), MEM_READ, PHYSICAL);
270     cpu->cd.rca180x.sp += sizeof(uint16_t);
271    
272     cpu->pc = pc12 & 0xfff;
273     quick_pc_to_pointers(cpu);
274     }
275    
276    
277     /*
278     * add_imm: Add constant to register, without updating the carry bit.
279     *
280     * arg[0] = ptr to register
281     * arg[1] = 8-bit constant
282     */
283     X(add_imm)
284     {
285     (*((uint8_t *)ic->arg[0])) += ic->arg[1];
286     }
287    
288    
289     /*
290     * rand: Set a register to a random value.
291     *
292     * arg[0] = ptr to register
293     * arg[1] = 8-bit constant
294     */
295     X(rand)
296     {
297     /* http://www.pdc.kth.se/~lfo/rca180x/RCA180X.htm says AND,
298     http://members.aol.com/autismuk/rca180x/rca180xdef.htm says %. */
299     (*((uint8_t *)ic->arg[0])) = random() & ic->arg[1];
300     }
301    
302    
303     /*
304     * skpr: Skip next instruction if key is pressed.
305     * skup: Skip next instruction if key is up.
306     *
307     * arg[0] = key number
308     */
309     X(skpr)
310     {
311     /* TODO */
312     }
313     X(skup)
314     {
315     /* TODO */
316     cpu->cd.rca180x.next_ic ++;
317     }
318    
319    
320     /*
321     * gdelay: Get the timer delay value.
322     * sdelay: Set the timer delay value.
323     * ssound: Set the sound delay value.
324     *
325     * arg[0] = ptr to register
326     */
327     X(gdelay) { *((uint8_t *)ic->arg[0]) = cpu->cd.rca180x.delay_timer_value; }
328     X(sdelay) { cpu->cd.rca180x.delay_timer_value = *((uint8_t *)ic->arg[0]); }
329     X(ssound) { cpu->cd.rca180x.sound_timer_value = *((uint8_t *)ic->arg[0]); }
330    
331    
332     /*
333     * adi: Add a register's value to the Index register.
334     *
335     * arg[0] = ptr to register
336     */
337     X(adi)
338     {
339     cpu->cd.rca180x.index += *((uint8_t *)ic->arg[0]);
340     }
341    
342    
343     /*
344     * font: Set the Index register to point to a font sprite.
345     *
346     * arg[0] = ptr to register containing the hex char
347     */
348     X(font)
349     {
350     int c = *((uint8_t *)ic->arg[0]);
351     if (c > 0xf)
352     fatal("[ rca180x font: WARNING: c = 0x%02x ]\n", c);
353     cpu->cd.rca180x.index = CHIP8_FONT_ADDR + 5 * (c & 0xf);
354     }
355    
356    
357     /*
358     * bcd: Store BCD representation of a register in memory.
359     *
360     * arg[0] = ptr to register
361     */
362     X(bcd)
363     {
364     int r = *((uint8_t *)ic->arg[0]);
365     uint8_t a[3];
366     a[0] = r / 100, a[1] = (r / 10) % 10, a[2] = r % 10;
367    
368     cpu->memory_rw(cpu, cpu->mem, cpu->cd.rca180x.index,
369     (unsigned char *) &a, sizeof(a), MEM_WRITE, PHYSICAL);
370     }
371    
372    
373     /*
374     * str: Store multiple registers to memory.
375     *
376     * arg[0] = last register number (note: not pointer)
377     */
378     X(str)
379     {
380     int r;
381     for (r=0; r<=ic->arg[0]; r++) {
382     cpu->memory_rw(cpu, cpu->mem, cpu->cd.rca180x.index++,
383     &cpu->cd.rca180x.v[r], sizeof(uint8_t), MEM_WRITE, PHYSICAL);
384     }
385     }
386    
387    
388     /*
389     * ldr: Load multiple registers from memory.
390     *
391     * arg[0] = last register number (note: not pointer)
392     */
393     X(ldr)
394     {
395     int r;
396     for (r=0; r<=ic->arg[0]; r++) {
397     cpu->memory_rw(cpu, cpu->mem, cpu->cd.rca180x.index++,
398     &cpu->cd.rca180x.v[r], sizeof(uint8_t), MEM_READ, PHYSICAL);
399     }
400     }
401    
402    
403     /*
404     * mvi: Move constant to Index register.
405     *
406     * arg[0] = 12-bit constant
407     */
408     X(mvi)
409     {
410     cpu->cd.rca180x.index = ic->arg[0];
411     }
412    
413    
414     /*****************************************************************************/
415    
416    
417     X(end_of_page)
418     {
419     /* Should never happen on RCA180X, because that would mean that we
420     are running outside of available memory. */
421    
422     fatal("[ rca180x end of page reached, halting ]\n");
423    
424     cpu->running = 0;
425     debugger_n_steps_left_before_interaction = 0;
426     cpu->cd.rca180x.next_ic = &nothing_call;
427    
428     /* end_of_page doesn't count as an executed instruction: */
429     cpu->n_translated_instrs --;
430     }
431    
432    
433     /*****************************************************************************/
434    
435    
436     /*
437     * rca180x_instr_to_be_translated():
438     *
439     * Translate an instruction word into an rca180x_instr_call. ic is filled in with
440     * valid data for the translated instruction, or a "nothing" instruction if
441     * there was a translation failure. The newly translated instruction is then
442     * executed.
443     */
444     X(to_be_translated)
445     {
446     int addr, low_pc, dst_addr;
447     unsigned char ib[2];
448     unsigned char *page;
449    
450     /* Figure out the (virtual) address of the instruction: */
451     low_pc = ((size_t)ic - (size_t)cpu->cd.rca180x.cur_ic_page)
452     / sizeof(struct rca180x_instr_call);
453     addr = cpu->pc & ~((RCA180X_IC_ENTRIES_PER_PAGE-1) <<
454     RCA180X_INSTR_ALIGNMENT_SHIFT);
455     addr += (low_pc << RCA180X_INSTR_ALIGNMENT_SHIFT);
456     cpu->pc = addr;
457     addr &= ~((1 << RCA180X_INSTR_ALIGNMENT_SHIFT) - 1);
458    
459     /* Read the instruction word from memory: */
460     page = cpu->cd.avr.host_load[addr >> 12];
461    
462     if (page != NULL) {
463     /* fatal("TRANSLATION HIT!\n"); */
464     memcpy(ib, page + (addr & 0xfff), sizeof(uint16_t));
465     } else {
466     /* fatal("TRANSLATION MISS!\n"); */
467     if (!cpu->memory_rw(cpu, cpu->mem, addr, ib,
468     sizeof(uint16_t), MEM_READ, CACHE_INSTRUCTION)) {
469     fatal("to_be_translated(): "
470     "read failed: TODO\n");
471     exit(1);
472     }
473     }
474    
475    
476     #define DYNTRANS_TO_BE_TRANSLATED_HEAD
477     #include "cpu_dyntrans.c"
478     #undef DYNTRANS_TO_BE_TRANSLATED_HEAD
479    
480    
481     /*
482     * Translate the instruction:
483     */
484    
485     switch (ib[0] >> 4) {
486    
487     case 0x0:
488     if (ib[0] == 0x00 && ib[1] == 0xe0) {
489     ic->f = instr(cls);
490     } else if (ib[0] == 0x00 && ib[1] == 0xee) {
491     ic->f = instr(rts);
492     } else {
493     goto bad;
494     }
495     break;
496    
497     case 0x1:
498     ic->f = instr(jmp);
499     dst_addr = ((ib[0] & 0xf) << 8) + ib[1];
500     ic->arg[0] = (size_t) (cpu->cd.rca180x.cur_ic_page +
501     (dst_addr >> RCA180X_INSTR_ALIGNMENT_SHIFT));
502     break;
503    
504     case 0x2:
505     ic->f = instr(jsr);
506     dst_addr = ((ib[0] & 0xf) << 8) + ib[1];
507     ic->arg[0] = (size_t) (cpu->cd.rca180x.cur_ic_page +
508     (dst_addr >> RCA180X_INSTR_ALIGNMENT_SHIFT));
509     break;
510    
511     case 0x3:
512     ic->f = instr(skeq_imm);
513     ic->arg[0] = (size_t) &cpu->cd.rca180x.v[ib[0] & 0xf];
514     ic->arg[1] = ib[1];
515     break;
516    
517     case 0x4:
518     ic->f = instr(skne_imm);
519     ic->arg[0] = (size_t) &cpu->cd.rca180x.v[ib[0] & 0xf];
520     ic->arg[1] = ib[1];
521     break;
522    
523     case 0x5:
524     ic->arg[0] = (size_t) &cpu->cd.rca180x.v[ib[0] & 0xf];
525     ic->arg[1] = (size_t) &cpu->cd.rca180x.v[ib[1] >> 4];
526     switch (ib[1] & 0xf) {
527     case 0x0: ic->f = instr(skeq); break;
528     default:goto bad;
529     }
530     break;
531    
532     case 0x6:
533     ic->f = instr(mov_imm);
534     ic->arg[0] = (size_t) &cpu->cd.rca180x.v[ib[0] & 0xf];
535     ic->arg[1] = ib[1];
536     break;
537    
538     case 0x7:
539     ic->f = instr(add_imm);
540     ic->arg[0] = (size_t) &cpu->cd.rca180x.v[ib[0] & 0xf];
541     ic->arg[1] = ib[1];
542     break;
543    
544     case 0x8:
545     ic->arg[0] = (size_t) &cpu->cd.rca180x.v[ib[0] & 0xf];
546     ic->arg[1] = (size_t) &cpu->cd.rca180x.v[ib[1] >> 4];
547     switch (ib[1] & 0xf) {
548     case 0x0: ic->f = instr(mov); break;
549     case 0x1: ic->f = instr(or); break;
550     case 0x2: ic->f = instr(and); break;
551     case 0x3: ic->f = instr(xor); break;
552     case 0x4: ic->f = instr(add); break;
553     case 0x5: ic->f = instr(sub); break;
554     default:goto bad;
555     }
556     break;
557    
558     case 0x9:
559     ic->arg[0] = (size_t) &cpu->cd.rca180x.v[ib[0] & 0xf];
560     ic->arg[1] = (size_t) &cpu->cd.rca180x.v[ib[1] >> 4];
561     switch (ib[1] & 0xf) {
562     case 0x0: ic->f = instr(skne); break;
563     default:goto bad;
564     }
565     break;
566    
567     case 0xa:
568     ic->f = instr(mvi);
569     ic->arg[0] = ((ib[0] & 0xf) << 8) + ib[1];
570     break;
571    
572     case 0xc:
573     ic->f = instr(rand);
574     ic->arg[0] = (size_t) &cpu->cd.rca180x.v[ib[0] & 0xf];
575     ic->arg[1] = ib[1];
576     break;
577    
578     case 0xd:
579     ic->f = instr(sprite);
580     ic->arg[0] = (size_t) &cpu->cd.rca180x.v[ib[0] & 0xf];
581     ic->arg[1] = (size_t) &cpu->cd.rca180x.v[ib[1] >> 4];
582     ic->arg[2] = ib[1] & 0xf;
583    
584     if (ic->arg[2] == 0) {
585     fatal("xsprite: TODO\n");
586     goto bad;
587     }
588     break;
589    
590     case 0xe:
591     /* Default arg 0: */
592     ic->arg[0] = ib[0] & 0xf;
593     switch (ib[1]) {
594     case 0x9e: ic->f = instr(skpr); break;
595     case 0xa1: ic->f = instr(skup); break;
596     default:goto bad;
597     }
598     break;
599    
600     case 0xf:
601     /* Default arg 0: */
602     ic->arg[0] = (size_t) &cpu->cd.rca180x.v[ib[0] & 0xf];
603     switch (ib[1]) {
604     case 0x07:
605     ic->f = instr(gdelay);
606     break;
607     case 0x15:
608     ic->f = instr(sdelay);
609     break;
610     case 0x18:
611     ic->f = instr(ssound);
612     break;
613     case 0x1e:
614     ic->f = instr(adi);
615     break;
616     case 0x29:
617     ic->f = instr(font);
618     break;
619     case 0x33:
620     ic->f = instr(bcd);
621     break;
622     case 0x55:
623     ic->f = instr(str);
624     ic->arg[0] = ib[0] & 0xf;
625     break;
626     case 0x65:
627     ic->f = instr(ldr);
628     ic->arg[0] = ib[0] & 0xf;
629     break;
630     default:goto bad;
631     }
632     break;
633    
634     default:goto bad;
635     }
636    
637    
638     #define DYNTRANS_TO_BE_TRANSLATED_TAIL
639     #include "cpu_dyntrans.c"
640     #undef DYNTRANS_TO_BE_TRANSLATED_TAIL
641     }
642    

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