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Diffstat (limited to '')
-rw-r--r-- | libraries/luajit-2.0/dynasm/dasm_x86.h | 470 |
1 files changed, 470 insertions, 0 deletions
diff --git a/libraries/luajit-2.0/dynasm/dasm_x86.h b/libraries/luajit-2.0/dynasm/dasm_x86.h new file mode 100644 index 0000000..8f2dd1c --- /dev/null +++ b/libraries/luajit-2.0/dynasm/dasm_x86.h | |||
@@ -0,0 +1,470 @@ | |||
1 | /* | ||
2 | ** DynASM x86 encoding engine. | ||
3 | ** Copyright (C) 2005-2011 Mike Pall. All rights reserved. | ||
4 | ** Released under the MIT license. See dynasm.lua for full copyright notice. | ||
5 | */ | ||
6 | |||
7 | #include <stddef.h> | ||
8 | #include <stdarg.h> | ||
9 | #include <string.h> | ||
10 | #include <stdlib.h> | ||
11 | |||
12 | #define DASM_ARCH "x86" | ||
13 | |||
14 | #ifndef DASM_EXTERN | ||
15 | #define DASM_EXTERN(a,b,c,d) 0 | ||
16 | #endif | ||
17 | |||
18 | /* Action definitions. DASM_STOP must be 255. */ | ||
19 | enum { | ||
20 | DASM_DISP = 233, | ||
21 | DASM_IMM_S, DASM_IMM_B, DASM_IMM_W, DASM_IMM_D, DASM_IMM_WB, DASM_IMM_DB, | ||
22 | DASM_VREG, DASM_SPACE, DASM_SETLABEL, DASM_REL_A, DASM_REL_LG, DASM_REL_PC, | ||
23 | DASM_IMM_LG, DASM_IMM_PC, DASM_LABEL_LG, DASM_LABEL_PC, DASM_ALIGN, | ||
24 | DASM_EXTERN, DASM_ESC, DASM_MARK, DASM_SECTION, DASM_STOP | ||
25 | }; | ||
26 | |||
27 | /* Maximum number of section buffer positions for a single dasm_put() call. */ | ||
28 | #define DASM_MAXSECPOS 25 | ||
29 | |||
30 | /* DynASM encoder status codes. Action list offset or number are or'ed in. */ | ||
31 | #define DASM_S_OK 0x00000000 | ||
32 | #define DASM_S_NOMEM 0x01000000 | ||
33 | #define DASM_S_PHASE 0x02000000 | ||
34 | #define DASM_S_MATCH_SEC 0x03000000 | ||
35 | #define DASM_S_RANGE_I 0x11000000 | ||
36 | #define DASM_S_RANGE_SEC 0x12000000 | ||
37 | #define DASM_S_RANGE_LG 0x13000000 | ||
38 | #define DASM_S_RANGE_PC 0x14000000 | ||
39 | #define DASM_S_RANGE_VREG 0x15000000 | ||
40 | #define DASM_S_UNDEF_L 0x21000000 | ||
41 | #define DASM_S_UNDEF_PC 0x22000000 | ||
42 | |||
43 | /* Macros to convert positions (8 bit section + 24 bit index). */ | ||
44 | #define DASM_POS2IDX(pos) ((pos)&0x00ffffff) | ||
45 | #define DASM_POS2BIAS(pos) ((pos)&0xff000000) | ||
46 | #define DASM_SEC2POS(sec) ((sec)<<24) | ||
47 | #define DASM_POS2SEC(pos) ((pos)>>24) | ||
48 | #define DASM_POS2PTR(D, pos) (D->sections[DASM_POS2SEC(pos)].rbuf + (pos)) | ||
49 | |||
50 | /* Action list type. */ | ||
51 | typedef const unsigned char *dasm_ActList; | ||
52 | |||
53 | /* Per-section structure. */ | ||
54 | typedef struct dasm_Section { | ||
55 | int *rbuf; /* Biased buffer pointer (negative section bias). */ | ||
56 | int *buf; /* True buffer pointer. */ | ||
57 | size_t bsize; /* Buffer size in bytes. */ | ||
58 | int pos; /* Biased buffer position. */ | ||
59 | int epos; /* End of biased buffer position - max single put. */ | ||
60 | int ofs; /* Byte offset into section. */ | ||
61 | } dasm_Section; | ||
62 | |||
63 | /* Core structure holding the DynASM encoding state. */ | ||
64 | struct dasm_State { | ||
65 | size_t psize; /* Allocated size of this structure. */ | ||
66 | dasm_ActList actionlist; /* Current actionlist pointer. */ | ||
67 | int *lglabels; /* Local/global chain/pos ptrs. */ | ||
68 | size_t lgsize; | ||
69 | int *pclabels; /* PC label chains/pos ptrs. */ | ||
70 | size_t pcsize; | ||
71 | void **globals; /* Array of globals (bias -10). */ | ||
72 | dasm_Section *section; /* Pointer to active section. */ | ||
73 | size_t codesize; /* Total size of all code sections. */ | ||
74 | int maxsection; /* 0 <= sectionidx < maxsection. */ | ||
75 | int status; /* Status code. */ | ||
76 | dasm_Section sections[1]; /* All sections. Alloc-extended. */ | ||
77 | }; | ||
78 | |||
79 | /* The size of the core structure depends on the max. number of sections. */ | ||
80 | #define DASM_PSZ(ms) (sizeof(dasm_State)+(ms-1)*sizeof(dasm_Section)) | ||
81 | |||
82 | |||
83 | /* Initialize DynASM state. */ | ||
84 | void dasm_init(Dst_DECL, int maxsection) | ||
85 | { | ||
86 | dasm_State *D; | ||
87 | size_t psz = 0; | ||
88 | int i; | ||
89 | Dst_REF = NULL; | ||
90 | DASM_M_GROW(Dst, struct dasm_State, Dst_REF, psz, DASM_PSZ(maxsection)); | ||
91 | D = Dst_REF; | ||
92 | D->psize = psz; | ||
93 | D->lglabels = NULL; | ||
94 | D->lgsize = 0; | ||
95 | D->pclabels = NULL; | ||
96 | D->pcsize = 0; | ||
97 | D->globals = NULL; | ||
98 | D->maxsection = maxsection; | ||
99 | for (i = 0; i < maxsection; i++) { | ||
100 | D->sections[i].buf = NULL; /* Need this for pass3. */ | ||
101 | D->sections[i].rbuf = D->sections[i].buf - DASM_SEC2POS(i); | ||
102 | D->sections[i].bsize = 0; | ||
103 | D->sections[i].epos = 0; /* Wrong, but is recalculated after resize. */ | ||
104 | } | ||
105 | } | ||
106 | |||
107 | /* Free DynASM state. */ | ||
108 | void dasm_free(Dst_DECL) | ||
109 | { | ||
110 | dasm_State *D = Dst_REF; | ||
111 | int i; | ||
112 | for (i = 0; i < D->maxsection; i++) | ||
113 | if (D->sections[i].buf) | ||
114 | DASM_M_FREE(Dst, D->sections[i].buf, D->sections[i].bsize); | ||
115 | if (D->pclabels) DASM_M_FREE(Dst, D->pclabels, D->pcsize); | ||
116 | if (D->lglabels) DASM_M_FREE(Dst, D->lglabels, D->lgsize); | ||
117 | DASM_M_FREE(Dst, D, D->psize); | ||
118 | } | ||
119 | |||
120 | /* Setup global label array. Must be called before dasm_setup(). */ | ||
121 | void dasm_setupglobal(Dst_DECL, void **gl, unsigned int maxgl) | ||
122 | { | ||
123 | dasm_State *D = Dst_REF; | ||
124 | D->globals = gl - 10; /* Negative bias to compensate for locals. */ | ||
125 | DASM_M_GROW(Dst, int, D->lglabels, D->lgsize, (10+maxgl)*sizeof(int)); | ||
126 | } | ||
127 | |||
128 | /* Grow PC label array. Can be called after dasm_setup(), too. */ | ||
129 | void dasm_growpc(Dst_DECL, unsigned int maxpc) | ||
130 | { | ||
131 | dasm_State *D = Dst_REF; | ||
132 | size_t osz = D->pcsize; | ||
133 | DASM_M_GROW(Dst, int, D->pclabels, D->pcsize, maxpc*sizeof(int)); | ||
134 | memset((void *)(((unsigned char *)D->pclabels)+osz), 0, D->pcsize-osz); | ||
135 | } | ||
136 | |||
137 | /* Setup encoder. */ | ||
138 | void dasm_setup(Dst_DECL, const void *actionlist) | ||
139 | { | ||
140 | dasm_State *D = Dst_REF; | ||
141 | int i; | ||
142 | D->actionlist = (dasm_ActList)actionlist; | ||
143 | D->status = DASM_S_OK; | ||
144 | D->section = &D->sections[0]; | ||
145 | memset((void *)D->lglabels, 0, D->lgsize); | ||
146 | if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize); | ||
147 | for (i = 0; i < D->maxsection; i++) { | ||
148 | D->sections[i].pos = DASM_SEC2POS(i); | ||
149 | D->sections[i].ofs = 0; | ||
150 | } | ||
151 | } | ||
152 | |||
153 | |||
154 | #ifdef DASM_CHECKS | ||
155 | #define CK(x, st) \ | ||
156 | do { if (!(x)) { \ | ||
157 | D->status = DASM_S_##st|(int)(p-D->actionlist-1); return; } } while (0) | ||
158 | #define CKPL(kind, st) \ | ||
159 | do { if ((size_t)((char *)pl-(char *)D->kind##labels) >= D->kind##size) { \ | ||
160 | D->status=DASM_S_RANGE_##st|(int)(p-D->actionlist-1); return; } } while (0) | ||
161 | #else | ||
162 | #define CK(x, st) ((void)0) | ||
163 | #define CKPL(kind, st) ((void)0) | ||
164 | #endif | ||
165 | |||
166 | /* Pass 1: Store actions and args, link branches/labels, estimate offsets. */ | ||
167 | void dasm_put(Dst_DECL, int start, ...) | ||
168 | { | ||
169 | va_list ap; | ||
170 | dasm_State *D = Dst_REF; | ||
171 | dasm_ActList p = D->actionlist + start; | ||
172 | dasm_Section *sec = D->section; | ||
173 | int pos = sec->pos, ofs = sec->ofs, mrm = 4; | ||
174 | int *b; | ||
175 | |||
176 | if (pos >= sec->epos) { | ||
177 | DASM_M_GROW(Dst, int, sec->buf, sec->bsize, | ||
178 | sec->bsize + 2*DASM_MAXSECPOS*sizeof(int)); | ||
179 | sec->rbuf = sec->buf - DASM_POS2BIAS(pos); | ||
180 | sec->epos = (int)sec->bsize/sizeof(int) - DASM_MAXSECPOS+DASM_POS2BIAS(pos); | ||
181 | } | ||
182 | |||
183 | b = sec->rbuf; | ||
184 | b[pos++] = start; | ||
185 | |||
186 | va_start(ap, start); | ||
187 | while (1) { | ||
188 | int action = *p++; | ||
189 | if (action < DASM_DISP) { | ||
190 | ofs++; | ||
191 | } else if (action <= DASM_REL_A) { | ||
192 | int n = va_arg(ap, int); | ||
193 | b[pos++] = n; | ||
194 | switch (action) { | ||
195 | case DASM_DISP: | ||
196 | if (n == 0) { if ((mrm&7) == 4) mrm = p[-2]; if ((mrm&7) != 5) break; } | ||
197 | case DASM_IMM_DB: if (((n+128)&-256) == 0) goto ob; | ||
198 | case DASM_REL_A: /* Assumes ptrdiff_t is int. !x64 */ | ||
199 | case DASM_IMM_D: ofs += 4; break; | ||
200 | case DASM_IMM_S: CK(((n+128)&-256) == 0, RANGE_I); goto ob; | ||
201 | case DASM_IMM_B: CK((n&-256) == 0, RANGE_I); ob: ofs++; break; | ||
202 | case DASM_IMM_WB: if (((n+128)&-256) == 0) goto ob; | ||
203 | case DASM_IMM_W: CK((n&-65536) == 0, RANGE_I); ofs += 2; break; | ||
204 | case DASM_SPACE: p++; ofs += n; break; | ||
205 | case DASM_SETLABEL: b[pos-2] = -0x40000000; break; /* Neg. label ofs. */ | ||
206 | case DASM_VREG: CK((n&-8) == 0 && (n != 4 || (*p&1) == 0), RANGE_VREG); | ||
207 | if (*p++ == 1 && *p == DASM_DISP) mrm = n; continue; | ||
208 | } | ||
209 | mrm = 4; | ||
210 | } else { | ||
211 | int *pl, n; | ||
212 | switch (action) { | ||
213 | case DASM_REL_LG: | ||
214 | case DASM_IMM_LG: | ||
215 | n = *p++; pl = D->lglabels + n; | ||
216 | if (n <= 246) { CKPL(lg, LG); goto putrel; } /* Bkwd rel or global. */ | ||
217 | pl -= 246; n = *pl; | ||
218 | if (n < 0) n = 0; /* Start new chain for fwd rel if label exists. */ | ||
219 | goto linkrel; | ||
220 | case DASM_REL_PC: | ||
221 | case DASM_IMM_PC: pl = D->pclabels + va_arg(ap, int); CKPL(pc, PC); | ||
222 | putrel: | ||
223 | n = *pl; | ||
224 | if (n < 0) { /* Label exists. Get label pos and store it. */ | ||
225 | b[pos] = -n; | ||
226 | } else { | ||
227 | linkrel: | ||
228 | b[pos] = n; /* Else link to rel chain, anchored at label. */ | ||
229 | *pl = pos; | ||
230 | } | ||
231 | pos++; | ||
232 | ofs += 4; /* Maximum offset needed. */ | ||
233 | if (action == DASM_REL_LG || action == DASM_REL_PC) | ||
234 | b[pos++] = ofs; /* Store pass1 offset estimate. */ | ||
235 | break; | ||
236 | case DASM_LABEL_LG: pl = D->lglabels + *p++; CKPL(lg, LG); goto putlabel; | ||
237 | case DASM_LABEL_PC: pl = D->pclabels + va_arg(ap, int); CKPL(pc, PC); | ||
238 | putlabel: | ||
239 | n = *pl; /* n > 0: Collapse rel chain and replace with label pos. */ | ||
240 | while (n > 0) { int *pb = DASM_POS2PTR(D, n); n = *pb; *pb = pos; } | ||
241 | *pl = -pos; /* Label exists now. */ | ||
242 | b[pos++] = ofs; /* Store pass1 offset estimate. */ | ||
243 | break; | ||
244 | case DASM_ALIGN: | ||
245 | ofs += *p++; /* Maximum alignment needed (arg is 2**n-1). */ | ||
246 | b[pos++] = ofs; /* Store pass1 offset estimate. */ | ||
247 | break; | ||
248 | case DASM_EXTERN: p += 2; ofs += 4; break; | ||
249 | case DASM_ESC: p++; ofs++; break; | ||
250 | case DASM_MARK: mrm = p[-2]; break; | ||
251 | case DASM_SECTION: | ||
252 | n = *p; CK(n < D->maxsection, RANGE_SEC); D->section = &D->sections[n]; | ||
253 | case DASM_STOP: goto stop; | ||
254 | } | ||
255 | } | ||
256 | } | ||
257 | stop: | ||
258 | va_end(ap); | ||
259 | sec->pos = pos; | ||
260 | sec->ofs = ofs; | ||
261 | } | ||
262 | #undef CK | ||
263 | |||
264 | /* Pass 2: Link sections, shrink branches/aligns, fix label offsets. */ | ||
265 | int dasm_link(Dst_DECL, size_t *szp) | ||
266 | { | ||
267 | dasm_State *D = Dst_REF; | ||
268 | int secnum; | ||
269 | int ofs = 0; | ||
270 | |||
271 | #ifdef DASM_CHECKS | ||
272 | *szp = 0; | ||
273 | if (D->status != DASM_S_OK) return D->status; | ||
274 | { | ||
275 | int pc; | ||
276 | for (pc = 0; pc*sizeof(int) < D->pcsize; pc++) | ||
277 | if (D->pclabels[pc] > 0) return DASM_S_UNDEF_PC|pc; | ||
278 | } | ||
279 | #endif | ||
280 | |||
281 | { /* Handle globals not defined in this translation unit. */ | ||
282 | int idx; | ||
283 | for (idx = 10; idx*sizeof(int) < D->lgsize; idx++) { | ||
284 | int n = D->lglabels[idx]; | ||
285 | /* Undefined label: Collapse rel chain and replace with marker (< 0). */ | ||
286 | while (n > 0) { int *pb = DASM_POS2PTR(D, n); n = *pb; *pb = -idx; } | ||
287 | } | ||
288 | } | ||
289 | |||
290 | /* Combine all code sections. No support for data sections (yet). */ | ||
291 | for (secnum = 0; secnum < D->maxsection; secnum++) { | ||
292 | dasm_Section *sec = D->sections + secnum; | ||
293 | int *b = sec->rbuf; | ||
294 | int pos = DASM_SEC2POS(secnum); | ||
295 | int lastpos = sec->pos; | ||
296 | |||
297 | while (pos != lastpos) { | ||
298 | dasm_ActList p = D->actionlist + b[pos++]; | ||
299 | while (1) { | ||
300 | int op, action = *p++; | ||
301 | switch (action) { | ||
302 | case DASM_REL_LG: p++; op = p[-3]; goto rel_pc; | ||
303 | case DASM_REL_PC: op = p[-2]; rel_pc: { | ||
304 | int shrink = op == 0xe9 ? 3 : ((op&0xf0) == 0x80 ? 4 : 0); | ||
305 | if (shrink) { /* Shrinkable branch opcode? */ | ||
306 | int lofs, lpos = b[pos]; | ||
307 | if (lpos < 0) goto noshrink; /* Ext global? */ | ||
308 | lofs = *DASM_POS2PTR(D, lpos); | ||
309 | if (lpos > pos) { /* Fwd label: add cumulative section offsets. */ | ||
310 | int i; | ||
311 | for (i = secnum; i < DASM_POS2SEC(lpos); i++) | ||
312 | lofs += D->sections[i].ofs; | ||
313 | } else { | ||
314 | lofs -= ofs; /* Bkwd label: unfix offset. */ | ||
315 | } | ||
316 | lofs -= b[pos+1]; /* Short branch ok? */ | ||
317 | if (lofs >= -128-shrink && lofs <= 127) ofs -= shrink; /* Yes. */ | ||
318 | else { noshrink: shrink = 0; } /* No, cannot shrink op. */ | ||
319 | } | ||
320 | b[pos+1] = shrink; | ||
321 | pos += 2; | ||
322 | break; | ||
323 | } | ||
324 | case DASM_SPACE: case DASM_IMM_LG: case DASM_VREG: p++; | ||
325 | case DASM_DISP: case DASM_IMM_S: case DASM_IMM_B: case DASM_IMM_W: | ||
326 | case DASM_IMM_D: case DASM_IMM_WB: case DASM_IMM_DB: | ||
327 | case DASM_SETLABEL: case DASM_REL_A: case DASM_IMM_PC: pos++; break; | ||
328 | case DASM_LABEL_LG: p++; | ||
329 | case DASM_LABEL_PC: b[pos++] += ofs; break; /* Fix label offset. */ | ||
330 | case DASM_ALIGN: ofs -= (b[pos++]+ofs)&*p++; break; /* Adjust ofs. */ | ||
331 | case DASM_EXTERN: p += 2; break; | ||
332 | case DASM_ESC: p++; break; | ||
333 | case DASM_MARK: break; | ||
334 | case DASM_SECTION: case DASM_STOP: goto stop; | ||
335 | } | ||
336 | } | ||
337 | stop: (void)0; | ||
338 | } | ||
339 | ofs += sec->ofs; /* Next section starts right after current section. */ | ||
340 | } | ||
341 | |||
342 | D->codesize = ofs; /* Total size of all code sections */ | ||
343 | *szp = ofs; | ||
344 | return DASM_S_OK; | ||
345 | } | ||
346 | |||
347 | #define dasmb(x) *cp++ = (unsigned char)(x) | ||
348 | #ifndef DASM_ALIGNED_WRITES | ||
349 | #define dasmw(x) \ | ||
350 | do { *((unsigned short *)cp) = (unsigned short)(x); cp+=2; } while (0) | ||
351 | #define dasmd(x) \ | ||
352 | do { *((unsigned int *)cp) = (unsigned int)(x); cp+=4; } while (0) | ||
353 | #else | ||
354 | #define dasmw(x) do { dasmb(x); dasmb((x)>>8); } while (0) | ||
355 | #define dasmd(x) do { dasmw(x); dasmw((x)>>16); } while (0) | ||
356 | #endif | ||
357 | |||
358 | /* Pass 3: Encode sections. */ | ||
359 | int dasm_encode(Dst_DECL, void *buffer) | ||
360 | { | ||
361 | dasm_State *D = Dst_REF; | ||
362 | unsigned char *base = (unsigned char *)buffer; | ||
363 | unsigned char *cp = base; | ||
364 | int secnum; | ||
365 | |||
366 | /* Encode all code sections. No support for data sections (yet). */ | ||
367 | for (secnum = 0; secnum < D->maxsection; secnum++) { | ||
368 | dasm_Section *sec = D->sections + secnum; | ||
369 | int *b = sec->buf; | ||
370 | int *endb = sec->rbuf + sec->pos; | ||
371 | |||
372 | while (b != endb) { | ||
373 | dasm_ActList p = D->actionlist + *b++; | ||
374 | unsigned char *mark = NULL; | ||
375 | while (1) { | ||
376 | int action = *p++; | ||
377 | int n = (action >= DASM_DISP && action <= DASM_ALIGN) ? *b++ : 0; | ||
378 | switch (action) { | ||
379 | case DASM_DISP: if (!mark) mark = cp; { | ||
380 | unsigned char *mm = mark; | ||
381 | if (*p != DASM_IMM_DB && *p != DASM_IMM_WB) mark = NULL; | ||
382 | if (n == 0) { int mrm = mm[-1]&7; if (mrm == 4) mrm = mm[0]&7; | ||
383 | if (mrm != 5) { mm[-1] -= 0x80; break; } } | ||
384 | if (((n+128) & -256) != 0) goto wd; else mm[-1] -= 0x40; | ||
385 | } | ||
386 | case DASM_IMM_S: case DASM_IMM_B: wb: dasmb(n); break; | ||
387 | case DASM_IMM_DB: if (((n+128)&-256) == 0) { | ||
388 | db: if (!mark) mark = cp; mark[-2] += 2; mark = NULL; goto wb; | ||
389 | } else mark = NULL; | ||
390 | case DASM_IMM_D: wd: dasmd(n); break; | ||
391 | case DASM_IMM_WB: if (((n+128)&-256) == 0) goto db; else mark = NULL; | ||
392 | case DASM_IMM_W: dasmw(n); break; | ||
393 | case DASM_VREG: { int t = *p++; if (t >= 2) n<<=3; cp[-1] |= n; break; } | ||
394 | case DASM_REL_LG: p++; if (n >= 0) goto rel_pc; | ||
395 | b++; n = (int)(ptrdiff_t)D->globals[-n]; | ||
396 | case DASM_REL_A: rel_a: n -= (int)(ptrdiff_t)(cp+4); goto wd; /* !x64 */ | ||
397 | case DASM_REL_PC: rel_pc: { | ||
398 | int shrink = *b++; | ||
399 | int *pb = DASM_POS2PTR(D, n); if (*pb < 0) { n = pb[1]; goto rel_a; } | ||
400 | n = *pb - ((int)(cp-base) + 4-shrink); | ||
401 | if (shrink == 0) goto wd; | ||
402 | if (shrink == 4) { cp--; cp[-1] = *cp-0x10; } else cp[-1] = 0xeb; | ||
403 | goto wb; | ||
404 | } | ||
405 | case DASM_IMM_LG: | ||
406 | p++; if (n < 0) { n = (int)(ptrdiff_t)D->globals[-n]; goto wd; } | ||
407 | case DASM_IMM_PC: { | ||
408 | int *pb = DASM_POS2PTR(D, n); | ||
409 | n = *pb < 0 ? pb[1] : (*pb + (int)(ptrdiff_t)base); | ||
410 | goto wd; | ||
411 | } | ||
412 | case DASM_LABEL_LG: { | ||
413 | int idx = *p++; | ||
414 | if (idx >= 10) | ||
415 | D->globals[idx] = (void *)(base + (*p == DASM_SETLABEL ? *b : n)); | ||
416 | break; | ||
417 | } | ||
418 | case DASM_LABEL_PC: case DASM_SETLABEL: break; | ||
419 | case DASM_SPACE: { int fill = *p++; while (n--) *cp++ = fill; break; } | ||
420 | case DASM_ALIGN: | ||
421 | n = *p++; | ||
422 | while (((cp-base) & n)) *cp++ = 0x90; /* nop */ | ||
423 | break; | ||
424 | case DASM_EXTERN: n = DASM_EXTERN(Dst, cp, p[1], *p); p += 2; goto wd; | ||
425 | case DASM_MARK: mark = cp; break; | ||
426 | case DASM_ESC: action = *p++; | ||
427 | default: *cp++ = action; break; | ||
428 | case DASM_SECTION: case DASM_STOP: goto stop; | ||
429 | } | ||
430 | } | ||
431 | stop: (void)0; | ||
432 | } | ||
433 | } | ||
434 | |||
435 | if (base + D->codesize != cp) /* Check for phase errors. */ | ||
436 | return DASM_S_PHASE; | ||
437 | return DASM_S_OK; | ||
438 | } | ||
439 | |||
440 | /* Get PC label offset. */ | ||
441 | int dasm_getpclabel(Dst_DECL, unsigned int pc) | ||
442 | { | ||
443 | dasm_State *D = Dst_REF; | ||
444 | if (pc*sizeof(int) < D->pcsize) { | ||
445 | int pos = D->pclabels[pc]; | ||
446 | if (pos < 0) return *DASM_POS2PTR(D, -pos); | ||
447 | if (pos > 0) return -1; /* Undefined. */ | ||
448 | } | ||
449 | return -2; /* Unused or out of range. */ | ||
450 | } | ||
451 | |||
452 | #ifdef DASM_CHECKS | ||
453 | /* Optional sanity checker to call between isolated encoding steps. */ | ||
454 | int dasm_checkstep(Dst_DECL, int secmatch) | ||
455 | { | ||
456 | dasm_State *D = Dst_REF; | ||
457 | if (D->status == DASM_S_OK) { | ||
458 | int i; | ||
459 | for (i = 1; i <= 9; i++) { | ||
460 | if (D->lglabels[i] > 0) { D->status = DASM_S_UNDEF_L|i; break; } | ||
461 | D->lglabels[i] = 0; | ||
462 | } | ||
463 | } | ||
464 | if (D->status == DASM_S_OK && secmatch >= 0 && | ||
465 | D->section != &D->sections[secmatch]) | ||
466 | D->status = DASM_S_MATCH_SEC|(int)(D->section-D->sections); | ||
467 | return D->status; | ||
468 | } | ||
469 | #endif | ||
470 | |||