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[/] [eco32/] [trunk/] [monitor/] [monitor/] [common/] [asm.c] - Blame information for rev 170

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/*
 * asm.c -- assembler
 */
 
 
#include "common.h"
#include "stdarg.h"
#include "romlib.h"
#include "instr.h"
#include "asm.h"
 
 
#define MAX_TOKENS      10
 
 
static char *msgs[] = {
  /*  0 */  "too many tokens on line",
  /*  1 */  "empty line",
  /*  2 */  "unknown instruction name",
  /*  3 */  "unknown instruction format",
  /*  4 */  "excess tokens on line",
  /*  5 */  "too few operands",
  /*  6 */  "illegal register",
  /*  7 */  "illegal immediate value",
  /*  8 */  "immediate value out of range",
  /*  9 */  "target is not aligned",
  /* 10 */  "target cannot be reached"
};
 
 
static Bool asmReg(char *token, int *reg) {
  char *end;
 
  if (*token != '$') {
    return false;
  }
  *reg = strtoul(token + 1, &end, 10);
  if (*end != '\0') {
    return false;
  }
  if (*reg < 0 || *reg >= 32) {
    return false;
  }
  return true;
}
 
 
static Bool asmNum(char *token, unsigned int *val) {
  char *end;
 
  *val = strtoul(token, &end, 16);
  return *end == '\0';
}
 
 
char *asmInstr(char *line, Word addr, Word *instrPtr) {
  char *tokens[MAX_TOKENS];
  int n;
  char *p;
  Instr *instr;
  Word result;
  int r1, r2, r3;
  unsigned int uimm;
  signed int simm;
 
  /* separate tokens */
  n = 0;
  p = strtok(line, " \t\n,");
  while (p != NULL) {
    if (n == MAX_TOKENS) {
      return msgs[0];
    }
    tokens[n++] = p;
    p = strtok(NULL, " \t\n,");
  }
  if (n == 0) {
    return msgs[1];
  }
  /* lookup mnemonic */
  instr = lookupInstr(tokens[0]);
  if (instr == NULL) {
    return msgs[2];
  }
  /* do processing according to format */
  switch (instr->format) {
    case FORMAT_N:
      /* no operands (but may get a constant operand) */
      if (n > 2) {
        return msgs[4];
      }
      if (n < 1) {
        return msgs[5];
      }
      if (n == 2) {
        if (!asmNum(tokens[1], &uimm)) {
          return msgs[7];
        }
      } else {
        uimm = 0;
      }
      result = ((Word) instr->opcode << 26) |
               (uimm & MASK(26));
      break;
    case FORMAT_RH:
      /* one register and a half operand */
      if (n > 3) {
        return msgs[4];
      }
      if (n < 3) {
        return msgs[5];
      }
      if (!asmReg(tokens[1], &r1)) {
        return msgs[6];
      }
      if (!asmNum(tokens[2], &uimm)) {
        return msgs[7];
      }
      if (uimm >= (unsigned) (1 << 16)) {
        return msgs[8];
      }
      result = ((Word) instr->opcode << 26) |
               (r1 << 16) |
               (uimm & MASK(16));
      break;
    case FORMAT_RHH:
      /* one register and a half operand */
      /* ATTENTION: high-order 16 bits encoded */
      if (n > 3) {
        return msgs[4];
      }
      if (n < 3) {
        return msgs[5];
      }
      if (!asmReg(tokens[1], &r1)) {
        return msgs[6];
      }
      if (!asmNum(tokens[2], &uimm)) {
        return msgs[7];
      }
      uimm >>= 16;
      if (uimm >= (unsigned) (1 << 16)) {
        return msgs[8];
      }
      result = ((Word) instr->opcode << 26) |
               (r1 << 16) |
               (uimm & MASK(16));
      break;
    case FORMAT_RRH:
      /* two registers and a half operand */
      if (n > 4) {
        return msgs[4];
      }
      if (n < 4) {
        return msgs[5];
      }
      if (!asmReg(tokens[1], &r1)) {
        return msgs[6];
      }
      if (!asmReg(tokens[2], &r2)) {
        return msgs[6];
      }
      if (!asmNum(tokens[3], &uimm)) {
        return msgs[7];
      }
      if (uimm >= (unsigned) (1 << 16)) {
        return msgs[8];
      }
      result = ((Word) instr->opcode << 26) |
               (r2 << 21) |
               (r1 << 16) |
               (uimm & MASK(16));
      break;
    case FORMAT_RRS:
      /* two registers and a signed half operand */
      if (n > 4) {
        return msgs[4];
      }
      if (n < 4) {
        return msgs[5];
      }
      if (!asmReg(tokens[1], &r1)) {
        return msgs[6];
      }
      if (!asmReg(tokens[2], &r2)) {
        return msgs[6];
      }
      if (!asmNum(tokens[3], (unsigned int *) &simm)) {
        return msgs[7];
      }
      if (simm >= (signed) (1 << 15) ||
          simm < - (signed) (1 << 15)) {
        return msgs[8];
      }
      result = ((Word) instr->opcode << 26) |
               (r2 << 21) |
               (r1 << 16) |
               (simm & MASK(16));
      break;
    case FORMAT_RRR:
      /* three register operands */
      if (n > 4) {
        return msgs[4];
      }
      if (n < 4) {
        return msgs[5];
      }
      if (!asmReg(tokens[1], &r1)) {
        return msgs[6];
      }
      if (!asmReg(tokens[2], &r2)) {
        return msgs[6];
      }
      if (!asmReg(tokens[3], &r3)) {
        return msgs[6];
      }
      result = ((Word) instr->opcode << 26) |
               (r2 << 21) |
               (r3 << 16) |
               (r1 << 11);
      break;
    case FORMAT_RRX:
      /* either FORMAT_RRR or FORMAT_RRH */
      if (n > 4) {
        return msgs[4];
      }
      if (n < 4) {
        return msgs[5];
      }
      if (!asmReg(tokens[1], &r1)) {
        return msgs[6];
      }
      if (!asmReg(tokens[2], &r2)) {
        return msgs[6];
      }
      if (*tokens[3] == '$') {
        /* FORMAT_RRR */
        if (!asmReg(tokens[3], &r3)) {
          return msgs[6];
        }
        result = ((Word) instr->opcode << 26) |
                 (r2 << 21) |
                 (r3 << 16) |
                 (r1 << 11);
      } else {
        /* FORMAT_RRH */
        if (!asmNum(tokens[3], &uimm)) {
          return msgs[7];
        }
        if (uimm >= (unsigned) (1 << 16)) {
          return msgs[8];
        }
        result = (((Word) instr->opcode + 1) << 26) |
                 (r2 << 21) |
                 (r1 << 16) |
                 (uimm & MASK(16));
      }
      break;
    case FORMAT_RRY:
      /* either FORMAT_RRR or FORMAT_RRS */
      if (n > 4) {
        return msgs[4];
      }
      if (n < 4) {
        return msgs[5];
      }
      if (!asmReg(tokens[1], &r1)) {
        return msgs[6];
      }
      if (!asmReg(tokens[2], &r2)) {
        return msgs[6];
      }
      if (*tokens[3] == '$') {
        /* FORMAT_RRR */
        if (!asmReg(tokens[3], &r3)) {
          return msgs[6];
        }
        result = ((Word) instr->opcode << 26) |
                 (r2 << 21) |
                 (r3 << 16) |
                 (r1 << 11);
      } else {
        /* FORMAT_RRS */
        if (!asmNum(tokens[3], (unsigned int *) &simm)) {
          return msgs[7];
        }
        if (simm >= (signed) (1 << 15) ||
            simm < - (signed) (1 << 15)) {
          return msgs[8];
        }
        result = (((Word) instr->opcode + 1) << 26) |
                 (r2 << 21) |
                 (r1 << 16) |
                 (simm & MASK(16));
      }
      break;
    case FORMAT_RRB:
      /* two registers and a 16 bit signed offset operand */
      if (n > 4) {
        return msgs[4];
      }
      if (n < 4) {
        return msgs[5];
      }
      if (!asmReg(tokens[1], &r1)) {
        return msgs[6];
      }
      if (!asmReg(tokens[2], &r2)) {
        return msgs[6];
      }
      if (!asmNum(tokens[3], (unsigned int *) &simm)) {
        return msgs[7];
      }
      if ((simm & 0x00000003) != 0) {
        return msgs[9];
      }
      simm -= addr + 4;
      simm /= 4;
      if (simm >= (signed) (1 << 15) ||
          simm < - (signed) (1 << 15)) {
        return msgs[10];
      }
      result = ((Word) instr->opcode << 26) |
               (r1 << 21) |
               (r2 << 16) |
               (simm & MASK(16));
      break;
    case FORMAT_J:
      /* no registers and a 26 bit signed offset operand */
      if (n > 2) {
        return msgs[4];
      }
      if (n < 2) {
        return msgs[5];
      }
      if (!asmNum(tokens[1], (unsigned int *) &simm)) {
        return msgs[7];
      }
      if ((simm & 0x00000003) != 0) {
        return msgs[9];
      }
      simm -= addr + 4;
      simm /= 4;
      if (simm >= (signed) (1 << 25) ||
          simm < - (signed) (1 << 25)) {
        return msgs[10];
      }
      result = ((Word) instr->opcode << 26) |
               (simm & MASK(26));
      break;
    case FORMAT_JR:
      /* one register operand */
      if (n > 2) {
        return msgs[4];
      }
      if (n < 2) {
        return msgs[5];
      }
      if (!asmReg(tokens[1], &r1)) {
        return msgs[6];
      }
      result = ((Word) instr->opcode << 26) |
               (r1 << 21);
      break;
    default:
      return msgs[3];
  }
  /* line successfully assembled */
  *instrPtr = result;
  return NULL;
}

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[/] [eco32/] [trunk/] [monitor/] [monitor/] [common/] [asm.c] - Blame information for rev 170

Line No.	Rev	Author	Line
1	59	hellwig	`/*`
2			`* asm.c -- assembler`
3			`*/`
4
5
6			`#include "common.h"`
7			`#include "stdarg.h"`
8			`#include "romlib.h"`
9			`#include "instr.h"`
10			`#include "asm.h"`
11
12
13			`#define MAX_TOKENS 10`
14
15
16			`static char *msgs[] = {`
17			`/* 0 */ "too many tokens on line",`
18			`/* 1 */ "empty line",`
19			`/* 2 */ "unknown instruction name",`
20			`/* 3 */ "unknown instruction format",`
21			`/* 4 */ "excess tokens on line",`
22			`/* 5 */ "too few operands",`
23			`/* 6 */ "illegal register",`
24			`/* 7 */ "illegal immediate value",`
25			`/* 8 */ "immediate value out of range",`
26			`/* 9 */ "target is not aligned",`
27			`/* 10 */ "target cannot be reached"`
28			`};`
29
30
31			`static Bool asmReg(char token, int reg) {`
32			`char *end;`
33
34			`if (*token != '$') {`
35			`return false;`
36			`}`
37			`*reg = strtoul(token + 1, &end, 10);`
38			`if (*end != '\0') {`
39			`return false;`
40			`}`
41			`if (reg < 0 \|\| reg >= 32) {`
42			`return false;`
43			`}`
44			`return true;`
45			`}`
46
47
48			`static Bool asmNum(char token, unsigned int val) {`
49			`char *end;`
50
51			`*val = strtoul(token, &end, 16);`
52			`return *end == '\0';`
53			`}`
54
55
56			`char asmInstr(char line, Word addr, Word *instrPtr) {`
57			`char *tokens[MAX_TOKENS];`
58			`int n;`
59			`char *p;`
60			`Instr *instr;`
61			`Word result;`
62			`int r1, r2, r3;`
63			`unsigned int uimm;`
64			`signed int simm;`
65
66			`/* separate tokens */`
67			`n = 0;`
68			`p = strtok(line, " \t\n,");`
69			`while (p != NULL) {`
70			`if (n == MAX_TOKENS) {`
71			`return msgs[0];`
72			`}`
73			`tokens[n++] = p;`
74			`p = strtok(NULL, " \t\n,");`
75			`}`
76			`if (n == 0) {`
77			`return msgs[1];`
78			`}`
79			`/* lookup mnemonic */`
80			`instr = lookupInstr(tokens[0]);`
81			`if (instr == NULL) {`
82			`return msgs[2];`
83			`}`
84			`/* do processing according to format */`
85			`switch (instr->format) {`
86			`case FORMAT_N:`
87			`/* no operands (but may get a constant operand) */`
88			`if (n > 2) {`
89			`return msgs[4];`
90			`}`
91			`if (n < 1) {`
92			`return msgs[5];`
93			`}`
94			`if (n == 2) {`
95			`if (!asmNum(tokens[1], &uimm)) {`
96			`return msgs[7];`
97			`}`
98			`} else {`
99			`uimm = 0;`
100			`}`
101			`result = ((Word) instr->opcode << 26) \|`
102			`(uimm & MASK(26));`
103			`break;`
104			`case FORMAT_RH:`
105			`/* one register and a half operand */`
106			`if (n > 3) {`
107			`return msgs[4];`
108			`}`
109			`if (n < 3) {`
110			`return msgs[5];`
111			`}`
112			`if (!asmReg(tokens[1], &r1)) {`
113			`return msgs[6];`
114			`}`
115			`if (!asmNum(tokens[2], &uimm)) {`
116			`return msgs[7];`
117			`}`
118			`if (uimm >= (unsigned) (1 << 16)) {`
119			`return msgs[8];`
120			`}`
121			`result = ((Word) instr->opcode << 26) \|`
122			`(r1 << 16) \|`
123			`(uimm & MASK(16));`
124			`break;`
125			`case FORMAT_RHH:`
126			`/* one register and a half operand */`
127			`/* ATTENTION: high-order 16 bits encoded */`
128			`if (n > 3) {`
129			`return msgs[4];`
130			`}`
131			`if (n < 3) {`
132			`return msgs[5];`
133			`}`
134			`if (!asmReg(tokens[1], &r1)) {`
135			`return msgs[6];`
136			`}`
137			`if (!asmNum(tokens[2], &uimm)) {`
138			`return msgs[7];`
139			`}`
140			`uimm >>= 16;`
141			`if (uimm >= (unsigned) (1 << 16)) {`
142			`return msgs[8];`
143			`}`
144			`result = ((Word) instr->opcode << 26) \|`
145			`(r1 << 16) \|`
146			`(uimm & MASK(16));`
147			`break;`
148			`case FORMAT_RRH:`
149			`/* two registers and a half operand */`
150			`if (n > 4) {`
151			`return msgs[4];`
152			`}`
153			`if (n < 4) {`
154			`return msgs[5];`
155			`}`
156			`if (!asmReg(tokens[1], &r1)) {`
157			`return msgs[6];`
158			`}`
159			`if (!asmReg(tokens[2], &r2)) {`
160			`return msgs[6];`
161			`}`
162			`if (!asmNum(tokens[3], &uimm)) {`
163			`return msgs[7];`
164			`}`
165			`if (uimm >= (unsigned) (1 << 16)) {`
166			`return msgs[8];`
167			`}`
168			`result = ((Word) instr->opcode << 26) \|`
169			`(r2 << 21) \|`
170			`(r1 << 16) \|`
171			`(uimm & MASK(16));`
172			`break;`
173			`case FORMAT_RRS:`
174			`/* two registers and a signed half operand */`
175			`if (n > 4) {`
176			`return msgs[4];`
177			`}`
178			`if (n < 4) {`
179			`return msgs[5];`
180			`}`
181			`if (!asmReg(tokens[1], &r1)) {`
182			`return msgs[6];`
183			`}`
184			`if (!asmReg(tokens[2], &r2)) {`
185			`return msgs[6];`
186			`}`
187			`if (!asmNum(tokens[3], (unsigned int *) &simm)) {`
188			`return msgs[7];`
189			`}`
190			`if (simm >= (signed) (1 << 15) \|\|`
191			`simm < - (signed) (1 << 15)) {`
192			`return msgs[8];`
193			`}`
194			`result = ((Word) instr->opcode << 26) \|`
195			`(r2 << 21) \|`
196			`(r1 << 16) \|`
197			`(simm & MASK(16));`
198			`break;`
199			`case FORMAT_RRR:`
200			`/* three register operands */`
201			`if (n > 4) {`
202			`return msgs[4];`
203			`}`
204			`if (n < 4) {`
205			`return msgs[5];`
206			`}`
207			`if (!asmReg(tokens[1], &r1)) {`
208			`return msgs[6];`
209			`}`
210			`if (!asmReg(tokens[2], &r2)) {`
211			`return msgs[6];`
212			`}`
213			`if (!asmReg(tokens[3], &r3)) {`
214			`return msgs[6];`
215			`}`
216			`result = ((Word) instr->opcode << 26) \|`
217			`(r2 << 21) \|`
218			`(r3 << 16) \|`
219			`(r1 << 11);`
220			`break;`
221			`case FORMAT_RRX:`
222			`/* either FORMAT_RRR or FORMAT_RRH */`
223			`if (n > 4) {`
224			`return msgs[4];`
225			`}`
226			`if (n < 4) {`
227			`return msgs[5];`
228			`}`
229			`if (!asmReg(tokens[1], &r1)) {`
230			`return msgs[6];`
231			`}`
232			`if (!asmReg(tokens[2], &r2)) {`
233			`return msgs[6];`
234			`}`
235			`if (*tokens[3] == '$') {`
236			`/* FORMAT_RRR */`
237			`if (!asmReg(tokens[3], &r3)) {`
238			`return msgs[6];`
239			`}`
240			`result = ((Word) instr->opcode << 26) \|`
241			`(r2 << 21) \|`
242			`(r3 << 16) \|`
243			`(r1 << 11);`
244			`} else {`
245			`/* FORMAT_RRH */`
246			`if (!asmNum(tokens[3], &uimm)) {`
247			`return msgs[7];`
248			`}`
249			`if (uimm >= (unsigned) (1 << 16)) {`
250			`return msgs[8];`
251			`}`
252			`result = (((Word) instr->opcode + 1) << 26) \|`
253			`(r2 << 21) \|`
254			`(r1 << 16) \|`
255			`(uimm & MASK(16));`
256			`}`
257			`break;`
258			`case FORMAT_RRY:`
259			`/* either FORMAT_RRR or FORMAT_RRS */`
260			`if (n > 4) {`
261			`return msgs[4];`
262			`}`
263			`if (n < 4) {`
264			`return msgs[5];`
265			`}`
266			`if (!asmReg(tokens[1], &r1)) {`
267			`return msgs[6];`
268			`}`
269			`if (!asmReg(tokens[2], &r2)) {`
270			`return msgs[6];`
271			`}`
272			`if (*tokens[3] == '$') {`
273			`/* FORMAT_RRR */`
274			`if (!asmReg(tokens[3], &r3)) {`
275			`return msgs[6];`
276			`}`
277			`result = ((Word) instr->opcode << 26) \|`
278			`(r2 << 21) \|`
279			`(r3 << 16) \|`
280			`(r1 << 11);`
281			`} else {`
282			`/* FORMAT_RRS */`
283			`if (!asmNum(tokens[3], (unsigned int *) &simm)) {`
284			`return msgs[7];`
285			`}`
286			`if (simm >= (signed) (1 << 15) \|\|`
287			`simm < - (signed) (1 << 15)) {`
288			`return msgs[8];`
289			`}`
290			`result = (((Word) instr->opcode + 1) << 26) \|`
291			`(r2 << 21) \|`
292			`(r1 << 16) \|`
293			`(simm & MASK(16));`
294			`}`
295			`break;`
296			`case FORMAT_RRB:`
297			`/* two registers and a 16 bit signed offset operand */`
298			`if (n > 4) {`
299			`return msgs[4];`
300			`}`
301			`if (n < 4) {`
302			`return msgs[5];`
303			`}`
304			`if (!asmReg(tokens[1], &r1)) {`
305			`return msgs[6];`
306			`}`
307			`if (!asmReg(tokens[2], &r2)) {`
308			`return msgs[6];`
309			`}`
310			`if (!asmNum(tokens[3], (unsigned int *) &simm)) {`
311			`return msgs[7];`
312			`}`
313			`if ((simm & 0x00000003) != 0) {`
314			`return msgs[9];`
315			`}`
316			`simm -= addr + 4;`
317			`simm /= 4;`
318			`if (simm >= (signed) (1 << 15) \|\|`
319			`simm < - (signed) (1 << 15)) {`
320			`return msgs[10];`
321			`}`
322			`result = ((Word) instr->opcode << 26) \|`
323			`(r1 << 21) \|`
324			`(r2 << 16) \|`
325			`(simm & MASK(16));`
326			`break;`
327			`case FORMAT_J:`
328			`/* no registers and a 26 bit signed offset operand */`
329			`if (n > 2) {`
330			`return msgs[4];`
331			`}`
332			`if (n < 2) {`
333			`return msgs[5];`
334			`}`
335			`if (!asmNum(tokens[1], (unsigned int *) &simm)) {`
336			`return msgs[7];`
337			`}`
338			`if ((simm & 0x00000003) != 0) {`
339			`return msgs[9];`
340			`}`
341			`simm -= addr + 4;`
342			`simm /= 4;`
343			`if (simm >= (signed) (1 << 25) \|\|`
344			`simm < - (signed) (1 << 25)) {`
345			`return msgs[10];`
346			`}`
347			`result = ((Word) instr->opcode << 26) \|`
348			`(simm & MASK(26));`
349			`break;`
350			`case FORMAT_JR:`
351			`/* one register operand */`
352			`if (n > 2) {`
353			`return msgs[4];`
354			`}`
355			`if (n < 2) {`
356			`return msgs[5];`
357			`}`
358			`if (!asmReg(tokens[1], &r1)) {`
359			`return msgs[6];`
360			`}`
361			`result = ((Word) instr->opcode << 26) \|`
362			`(r1 << 21);`
363			`break;`
364			`default:`
365			`return msgs[3];`
366			`}`
367			`/* line successfully assembled */`
368			`*instrPtr = result;`
369			`return NULL;`
370			`}`