/[gxemul]/trunk/experiments/rssb_as.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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Contents of /trunk/experiments/rssb_as.c

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Revision 10 - (show annotations)
Mon Oct 8 16:18:27 2007 UTC (12 years, 2 months ago) by dpavlin
File MIME type: text/plain
File size: 6737 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.815 2005/06/27 23:04:35 debug Exp $
20050617	Experimenting some more with netbooting OpenBSD/sgi. Adding
		a hack which allows emulated ethernet networks to be
		distributed across multiple emulator processes.
20050618	Minor updates (documentation, dummy YAMON emulation, etc).
20050620	strcpy/strcat -> strlcpy/strlcat updates.
		Some more progress on evbmips (Malta).
20050621	Adding a section to doc/configfiles.html about ethernet
		emulation across multiple hosts.
		Beginning the work on the ARM translation engine (using the
		dynamic-but-not-binary translation method).
		Fixing a bintrans bug: 0x9fc00000 should always be treated as
		PROM area, just as 0xbfc00000 is.
		Minor progress on Malta emulation (the PCI-ISA bus).
20050622	NetBSD/evbmips can now be installed (using another emulated
		machine) and run (including userland and so on). :-)
		Spliting up the bintrans haddr_entry field into two (one for
		read, one for write). Probably not much of a speed increase,
		though.
		Updating some NetBSD 2.0 -> 2.0.2 in the documentation.
20050623	Minor updates (documentation, the TODO file, etc).
		gzipped kernels are now always automagically gunzipped when
		loaded.
20050624	Adding a dummy Playstation Portable (PSP) mode, just barely
		enough to run Hello World (in weird colors :-).
		Removing the -b command line option; old bintrans is enabled
		by default instead. It makes more sense.
		Trying to finally fix the non-working performance measurement
		thing (instr/second etc).
20050625	Continuing on the essential basics for ARM emulation. Two
		instructions seem to work, a branch and a simple "mov". (The
		mov arguments are not correct yet.) Performance is definitely
		reasonable.
		Various other minor updates.
		Adding the ARM "bl" instruction.
		Adding support for combining multiple ARM instructions into one
		function call. ("mov" + "mov" is the only one implemented so
		far, but it seems to work.)
		Cleaning up some IP32 interrupt things (crime/mace); disabling
		the PS/2 keyboard controller on IP32, so that NetBSD/sgimips
		boots into userland again.
20050626	Finally! NetBSD/sgimips netboots. Adding instructions to
		doc/guestoses.html on how to set up an nfs server etc.
		Various other minor fixes.
		Playstation Portable ".pbp" files can now be used directly.
		(The ELF part of the .pbp is extracted transparently.)
		Converting some sprintf -> snprintf.
		Adding some more instructions to the ARM disassembler.
20050627	More ARM updates. Adding some simple ldr(b), str(b),
		cmps, and conditional branch instructions, enough to run
		a simple Hello World program.
		All ARM instructions are now inlined/generated for all possible
		condition codes.
		Adding add and sub, and more load/store instructions.
		Removing dummy files: cpu_alpha.c, cpu_hppa.c, and cpu_sparc.c.
		Some minor documentation updates; preparing for a 0.3.4
		release. Updating some URLs.

==============  RELEASE 0.3.4  ==============


1 /*
2 * Copyright (C) 2002,2005 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 * $Id: rssb_as.c,v 1.3 2005/06/20 05:52:45 debug Exp $
28 *
29 * A simple assembler for URISC ("reverse subtract and skip on borrow").
30 */
31
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <inttypes.h>
36
37
38 #define MAX_SYMBOL_LEN 64
39
40 struct symbol {
41 char name[MAX_SYMBOL_LEN];
42 uint32_t addr;
43 struct symbol *next;
44 };
45
46
47 struct symbol *first_symbol = NULL;
48
49
50 int debug = 0;
51
52
53 uint32_t get_symbol(char *symbol)
54 {
55 struct symbol *s;
56
57 s = first_symbol;
58 while (s != NULL) {
59 if (strcmp(symbol, s->name) == 0)
60 return s->addr;
61
62 s = s->next;
63 }
64
65 fprintf(stderr, "undefined symbol '%s'\n", symbol);
66 exit(1);
67 }
68
69
70 void add_symbol(char *symbol, uint32_t addr)
71 {
72 struct symbol *s;
73
74 if (strlen(symbol) > MAX_SYMBOL_LEN-1) {
75 fprintf(stderr, "symbol '%s' too long\n", symbol);
76 exit(1);
77 }
78
79 s = malloc(sizeof(struct symbol));
80 if (s == NULL) {
81 fprintf(stderr, "out of memory\n");
82 exit(1);
83 }
84
85 strlcpy(s->name, symbol, MAX_SYMBOL_LEN);
86 s->addr = addr;
87
88 if (debug > 1)
89 printf(" %08x = %s\n", addr, symbol);
90
91 s->next = first_symbol;
92 first_symbol = s;
93 }
94
95
96 uint32_t pass1(FILE *fin)
97 {
98 uint32_t curaddr = 0;
99 char line[200];
100 int lineno = 0;
101
102 if (debug > 0)
103 printf("Pass 1\n");
104
105 while (!feof(fin)) {
106 line[0] = '\0';
107 fgets(line, sizeof(line), fin);
108 lineno++;
109 if (line[0]) {
110 if (line[strlen(line)-1]=='\n')
111 line[strlen(line)-1]=0;
112
113 if (debug > 2)
114 printf(" addr=%08x line='%s'\n",
115 curaddr,line);
116
117 switch (line[0]) {
118 case '\0':
119 case '#':
120 break;
121 case 'L':
122 /* Add a symbol: */
123 add_symbol(line+1, curaddr);
124 break;
125 case 'A':
126 case 'D':
127 case 'E':
128 /* Increase addr by 4: */
129 curaddr += sizeof(uint32_t);
130 break;
131 case 'O':
132 /* Set orig manually: */
133 curaddr = atoi(line+1);
134 break;
135 default:
136 fprintf(stderr, "error on input line %i\n",
137 lineno);
138 exit(1);
139 }
140 }
141 }
142
143 return curaddr;
144 }
145
146
147 void pass2(FILE *fin, FILE *fout, uint32_t first_diffaddr)
148 {
149 uint32_t curaddr = 0;
150 uint32_t curdiffaddr = first_diffaddr;
151 uint32_t value, value2;
152 char line[200];
153 int lineno = 0;
154 char *p;
155 unsigned char b1;
156 unsigned char b2;
157 unsigned char b3;
158 unsigned char b4;
159
160 if (debug > 0)
161 printf("Pass 2\n");
162
163 while (!feof(fin)) {
164 line[0] = '\0';
165 fgets(line, sizeof(line), fin);
166 lineno++;
167 if (line[0]) {
168 if (line[strlen(line)-1]=='\n')
169 line[strlen(line)-1]=0;
170
171 if (debug > 2)
172 printf(" addr=%08x line='%s'\n",
173 curaddr,line);
174
175 switch (line[0]) {
176 case '\0':
177 case '#':
178 case 'L':
179 break;
180 case 'A':
181 /* Output value and increase addr by 4: */
182 fseek(fout, curaddr, SEEK_SET);
183 if (line[1]>='0' && line[1]<='9')
184 value = atoi(line+1);
185 else
186 value = get_symbol(line+1);
187 b1 = value >> 24;
188 b2 = value >> 16;
189 b3 = value >> 8;
190 b4 = value;
191 fwrite(&b1, 1, 1, fout);
192 fwrite(&b2, 1, 1, fout);
193 fwrite(&b3, 1, 1, fout);
194 fwrite(&b4, 1, 1, fout);
195
196 curaddr += sizeof(uint32_t);
197 break;
198 case 'D':
199 case 'E':
200 /* Address differance calculation: */
201 p = line+1;
202 while (*p && *p!=' ')
203 p++;
204 if (!*p) {
205 fprintf(stderr, "error on input line"
206 " %i, D syntax error\n", lineno);
207 exit(1);
208 }
209 p[0]=0; p++;
210
211 if (line[1]>='0' && line[1]<='9')
212 value = atoi(line+1);
213 else
214 value = get_symbol(line+1);
215
216 if (p[0]>='0' && p[0]<='9')
217 value2 = atoi(p);
218 else
219 value2 = get_symbol(p);
220
221 if (line[0]=='D') {
222 if (value < value2)
223 value = value - value2 + 4;
224 else
225 value = value - value2;
226 } else {
227 /* In conditional jumps: The -4
228 is because PC is already
229 updated when it is written
230 back to: */
231 value = value - value2 - 4;
232 }
233
234 /* Output value in the diff section: */
235 fseek(fout, curdiffaddr, SEEK_SET);
236 b1 = value >> 24;
237 b2 = value >> 16;
238 b3 = value >> 8;
239 b4 = value;
240 fwrite(&b1, 1, 1, fout);
241 fwrite(&b2, 1, 1, fout);
242 fwrite(&b3, 1, 1, fout);
243 fwrite(&b4, 1, 1, fout);
244
245 /* Output the diff addr to the code section: */
246 fseek(fout, curaddr, SEEK_SET);
247 value = curdiffaddr;
248 b1 = value >> 24;
249 b2 = value >> 16;
250 b3 = value >> 8;
251 b4 = value;
252 fwrite(&b1, 1, 1, fout);
253 fwrite(&b2, 1, 1, fout);
254 fwrite(&b3, 1, 1, fout);
255 fwrite(&b4, 1, 1, fout);
256
257 curaddr += sizeof(uint32_t);
258 curdiffaddr += sizeof(uint32_t);
259 break;
260 case 'O':
261 /* Set orig manually: */
262 curaddr = atoi(line+1);
263 break;
264 default:
265 fprintf(stderr, "error on input line %i\n",
266 lineno);
267 exit(1);
268 }
269 }
270 }
271 }
272
273
274 int main(int argc, char *argv[])
275 {
276 FILE *fin, *fout;
277 uint32_t first_diffaddr;
278
279 if (argc != 3) {
280 fprintf(stderr, "usage: %s asmsource binimage\n", argv[0]);
281 fprintf(stderr, "Input is read from asmsource and "
282 "output is written to binimage\n");
283 exit(1);
284 }
285
286 fin = fopen(argv[1], "r");
287 if (fin == NULL) {
288 perror(argv[1]);
289 exit(2);
290 }
291
292 fout = fopen(argv[2], "w");
293 if (fout = NULL) {
294 perror(argv[2]);
295 exit(2);
296 }
297
298 first_diffaddr = pass1(fin);
299 fseek(fin, 0, SEEK_SET);
300 pass2(fin, fout, first_diffaddr);
301
302 fclose(fin);
303 fclose(fout);
304
305 return 0;
306 }
307

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