dynasm/dasm_x86.h

   1 /*
   2 ** DynASM x86 encoding engine.
   3 ** Copyright (C) 2005-2023 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. */
  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   Dst_REF = NULL;
  89   DASM_M_GROW(Dst, struct dasm_State, Dst_REF, psz, DASM_PSZ(maxsection));
  90   D = Dst_REF;
  91   D->psize = psz;
  92   D->lglabels = NULL;
  93   D->lgsize = 0;
  94   D->pclabels = NULL;
  95   D->pcsize = 0;
  96   D->globals = NULL;
  97   D->maxsection = maxsection;
  98   memset((void *)D->sections, 0, maxsection * sizeof(dasm_Section));
  99 }
 100
 101 /* Free DynASM state. */
 102 void dasm_free(Dst_DECL)
 103 {
 104   dasm_State *D = Dst_REF;
 105   int i;
 106   for (i = 0; i < D->maxsection; i++)
 107     if (D->sections[i].buf)
 108       DASM_M_FREE(Dst, D->sections[i].buf, D->sections[i].bsize);
 109   if (D->pclabels) DASM_M_FREE(Dst, D->pclabels, D->pcsize);
 110   if (D->lglabels) DASM_M_FREE(Dst, D->lglabels, D->lgsize);
 111   DASM_M_FREE(Dst, D, D->psize);
 112 }
 113
 114 /* Setup global label array. Must be called before dasm_setup(). */
 115 void dasm_setupglobal(Dst_DECL, void **gl, unsigned int maxgl)
 116 {
 117   dasm_State *D = Dst_REF;
 118   D->globals = gl;
 119   DASM_M_GROW(Dst, int, D->lglabels, D->lgsize, (10+maxgl)*sizeof(int));
 120 }
 121
 122 /* Grow PC label array. Can be called after dasm_setup(), too. */
 123 void dasm_growpc(Dst_DECL, unsigned int maxpc)
 124 {
 125   dasm_State *D = Dst_REF;
 126   size_t osz = D->pcsize;
 127   DASM_M_GROW(Dst, int, D->pclabels, D->pcsize, maxpc*sizeof(int));
 128   memset((void *)(((unsigned char *)D->pclabels)+osz), 0, D->pcsize-osz);
 129 }
 130
 131 /* Setup encoder. */
 132 void dasm_setup(Dst_DECL, const void *actionlist)
 133 {
 134   dasm_State *D = Dst_REF;
 135   int i;
 136   D->actionlist = (dasm_ActList)actionlist;
 137   D->status = DASM_S_OK;
 138   D->section = &D->sections[0];
 139   memset((void *)D->lglabels, 0, D->lgsize);
 140   if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);
 141   for (i = 0; i < D->maxsection; i++) {
 142     D->sections[i].pos = DASM_SEC2POS(i);
 143     D->sections[i].rbuf = D->sections[i].buf - D->sections[i].pos;
 144     D->sections[i].ofs = 0;
 145   }
 146 }
 147
 148
 149 #ifdef DASM_CHECKS
 150 #define CK(x, st) \
 151   do { if (!(x)) { \
 152     D->status = DASM_S_##st|(int)(p-D->actionlist-1); return; } } while (0)
 153 #define CKPL(kind, st) \
 154   do { if ((size_t)((char *)pl-(char *)D->kind##labels) >= D->kind##size) { \
 155     D->status=DASM_S_RANGE_##st|(int)(p-D->actionlist-1); return; } } while (0)
 156 #else
 157 #define CK(x, st)       ((void)0)
 158 #define CKPL(kind, st)  ((void)0)
 159 #endif
 160
 161 /* Pass 1: Store actions and args, link branches/labels, estimate offsets. */
 162 void dasm_put(Dst_DECL, int start, ...)
 163 {
 164   va_list ap;
 165   dasm_State *D = Dst_REF;
 166   dasm_ActList p = D->actionlist + start;
 167   dasm_Section *sec = D->section;
 168   int pos = sec->pos, ofs = sec->ofs, mrm = -1;
 169   int *b;
 170
 171   if (pos >= sec->epos) {
 172     DASM_M_GROW(Dst, int, sec->buf, sec->bsize,
 173       sec->bsize + 2*DASM_MAXSECPOS*sizeof(int));
 174     sec->rbuf = sec->buf - DASM_POS2BIAS(pos);
 175     sec->epos = (int)sec->bsize/sizeof(int) - DASM_MAXSECPOS+DASM_POS2BIAS(pos);
 176   }
 177
 178   b = sec->rbuf;
 179   b[pos++] = start;
 180
 181   va_start(ap, start);
 182   while (1) {
 183     int action = *p++;
 184     if (action < DASM_DISP) {
 185       ofs++;
 186     } else if (action <= DASM_REL_A) {
 187       int n = va_arg(ap, int);
 188       b[pos++] = n;
 189       switch (action) {
 190       case DASM_DISP:
 191         if (n == 0) { if (mrm < 0) mrm = p[-2]; if ((mrm&7) != 5) break; }
 192         /* fallthrough */
 193       case DASM_IMM_DB: if (((n+128)&-256) == 0) goto ob; /* fallthrough */
 194       case DASM_REL_A: /* Assumes ptrdiff_t is int. !x64 */
 195       case DASM_IMM_D: ofs += 4; break;
 196       case DASM_IMM_S: CK(((n+128)&-256) == 0, RANGE_I); goto ob;
 197       case DASM_IMM_B: CK((n&-256) == 0, RANGE_I); ob: ofs++; break;
 198       case DASM_IMM_WB: if (((n+128)&-256) == 0) goto ob; /* fallthrough */
 199       case DASM_IMM_W: CK((n&-65536) == 0, RANGE_I); ofs += 2; break;
 200       case DASM_SPACE: p++; ofs += n; break;
 201       case DASM_SETLABEL: b[pos-2] = -0x40000000; break;  /* Neg. label ofs. */
 202       case DASM_VREG: CK((n&-16) == 0 && (n != 4 || (*p>>5) != 2), RANGE_VREG);
 203         if (*p < 0x40 && p[1] == DASM_DISP) mrm = n;
 204         if (*p < 0x20 && (n&7) == 4) ofs++;
 205         switch ((*p++ >> 3) & 3) {
 206         case 3: n |= b[pos-3]; /* fallthrough */
 207         case 2: n |= b[pos-2]; /* fallthrough */
 208         case 1: if (n <= 7) { b[pos-1] |= 0x10; ofs--; }
 209         }
 210         continue;
 211       }
 212       mrm = -1;
 213     } else {
 214       int *pl, n;
 215       switch (action) {
 216       case DASM_REL_LG:
 217       case DASM_IMM_LG:
 218         n = *p++; pl = D->lglabels + n;
 219         /* Bkwd rel or global. */
 220         if (n <= 246) { CK(n>=10||*pl<0, RANGE_LG); CKPL(lg, LG); goto putrel; }
 221         pl -= 246; n = *pl;
 222         if (n < 0) n = 0;  /* Start new chain for fwd rel if label exists. */
 223         goto linkrel;
 224       case DASM_REL_PC:
 225       case DASM_IMM_PC: pl = D->pclabels + va_arg(ap, int); CKPL(pc, PC);
 226       putrel:
 227         n = *pl;
 228         if (n < 0) {  /* Label exists. Get label pos and store it. */
 229           b[pos] = -n;
 230         } else {
 231       linkrel:
 232           b[pos] = n;  /* Else link to rel chain, anchored at label. */
 233           *pl = pos;
 234         }
 235         pos++;
 236         ofs += 4;  /* Maximum offset needed. */
 237         if (action == DASM_REL_LG || action == DASM_REL_PC) {
 238           b[pos++] = ofs;  /* Store pass1 offset estimate. */
 239         } else if (sizeof(ptrdiff_t) == 8) {
 240           ofs += 4;
 241         }
 242         break;
 243       case DASM_LABEL_LG: pl = D->lglabels + *p++; CKPL(lg, LG); goto putlabel;
 244       case DASM_LABEL_PC: pl = D->pclabels + va_arg(ap, int); CKPL(pc, PC);
 245       putlabel:
 246         n = *pl;  /* n > 0: Collapse rel chain and replace with label pos. */
 247         while (n > 0) { int *pb = DASM_POS2PTR(D, n); n = *pb; *pb = pos; }
 248         *pl = -pos;  /* Label exists now. */
 249         b[pos++] = ofs;  /* Store pass1 offset estimate. */
 250         break;
 251       case DASM_ALIGN:
 252         ofs += *p++;  /* Maximum alignment needed (arg is 2**n-1). */
 253         b[pos++] = ofs;  /* Store pass1 offset estimate. */
 254         break;
 255       case DASM_EXTERN: p += 2; ofs += 4; break;
 256       case DASM_ESC: p++; ofs++; break;
 257       case DASM_MARK: mrm = p[-2]; break;
 258       case DASM_SECTION:
 259         n = *p; CK(n < D->maxsection, RANGE_SEC); D->section = &D->sections[n];
 260       case DASM_STOP: goto stop;
 261       }
 262     }
 263   }
 264 stop:
 265   va_end(ap);
 266   sec->pos = pos;
 267   sec->ofs = ofs;
 268 }
 269 #undef CK
 270
 271 /* Pass 2: Link sections, shrink branches/aligns, fix label offsets. */
 272 int dasm_link(Dst_DECL, size_t *szp)
 273 {
 274   dasm_State *D = Dst_REF;
 275   int secnum;
 276   int ofs = 0;
 277
 278 #ifdef DASM_CHECKS
 279   *szp = 0;
 280   if (D->status != DASM_S_OK) return D->status;
 281   {
 282     int pc;
 283     for (pc = 0; pc*sizeof(int) < D->pcsize; pc++)
 284       if (D->pclabels[pc] > 0) return DASM_S_UNDEF_PC|pc;
 285   }
 286 #endif
 287
 288   { /* Handle globals not defined in this translation unit. */
 289     int idx;
 290     for (idx = 10; idx*sizeof(int) < D->lgsize; idx++) {
 291       int n = D->lglabels[idx];
 292       /* Undefined label: Collapse rel chain and replace with marker (< 0). */
 293       while (n > 0) { int *pb = DASM_POS2PTR(D, n); n = *pb; *pb = -idx; }
 294     }
 295   }
 296
 297   /* Combine all code sections. No support for data sections (yet). */
 298   for (secnum = 0; secnum < D->maxsection; secnum++) {
 299     dasm_Section *sec = D->sections + secnum;
 300     int *b = sec->rbuf;
 301     int pos = DASM_SEC2POS(secnum);
 302     int lastpos = sec->pos;
 303
 304     while (pos != lastpos) {
 305       dasm_ActList p = D->actionlist + b[pos++];
 306       int op = 0;
 307       while (1) {
 308         int action = *p++;
 309         switch (action) {
 310         case DASM_REL_LG: p++;
 311           /* fallthrough */
 312         case DASM_REL_PC: {
 313           int shrink = op == 0xe9 ? 3 : ((op&0xf0) == 0x80 ? 4 : 0);
 314           if (shrink) {  /* Shrinkable branch opcode? */
 315             int lofs, lpos = b[pos];
 316             if (lpos < 0) goto noshrink;  /* Ext global? */
 317             lofs = *DASM_POS2PTR(D, lpos);
 318             if (lpos > pos) {  /* Fwd label: add cumulative section offsets. */
 319               int i;
 320               for (i = secnum; i < DASM_POS2SEC(lpos); i++)
 321                 lofs += D->sections[i].ofs;
 322             } else {
 323               lofs -= ofs;  /* Bkwd label: unfix offset. */
 324             }
 325             lofs -= b[pos+1];  /* Short branch ok? */
 326             if (lofs >= -128-shrink && lofs <= 127) ofs -= shrink;  /* Yes. */
 327             else { noshrink: shrink = 0; }  /* No, cannot shrink op. */
 328           }
 329           b[pos+1] = shrink;
 330           pos += 2;
 331           break;
 332         }
 333           /* fallthrough */
 334         case DASM_SPACE: case DASM_IMM_LG: case DASM_VREG: p++;
 335           /* fallthrough */
 336         case DASM_DISP: case DASM_IMM_S: case DASM_IMM_B: case DASM_IMM_W:
 337         case DASM_IMM_D: case DASM_IMM_WB: case DASM_IMM_DB:
 338         case DASM_SETLABEL: case DASM_REL_A: case DASM_IMM_PC: pos++; break;
 339         case DASM_LABEL_LG: p++;
 340           /* fallthrough */
 341         case DASM_LABEL_PC: b[pos++] += ofs; break; /* Fix label offset. */
 342         case DASM_ALIGN: ofs -= (b[pos++]+ofs)&*p++; break; /* Adjust ofs. */
 343         case DASM_EXTERN: p += 2; break;
 344         case DASM_ESC: op = *p++; break;
 345         case DASM_MARK: break;
 346         case DASM_SECTION: case DASM_STOP: goto stop;
 347         default: op = action; break;
 348         }
 349       }
 350       stop: (void)0;
 351     }
 352     ofs += sec->ofs;  /* Next section starts right after current section. */
 353   }
 354
 355   D->codesize = ofs;  /* Total size of all code sections */
 356   *szp = ofs;
 357   return DASM_S_OK;
 358 }
 359
 360 #define dasmb(x)        *cp++ = (unsigned char)(x)
 361 #ifndef DASM_ALIGNED_WRITES
 362 #define dasmw(x) \
 363   do { *((unsigned short *)cp) = (unsigned short)(x); cp+=2; } while (0)
 364 #define dasmd(x) \
 365   do { *((unsigned int *)cp) = (unsigned int)(x); cp+=4; } while (0)
 366 #define dasmq(x) \
 367   do { *((unsigned long long *)cp) = (unsigned long long)(x); cp+=8; } while (0)
 368 #else
 369 #define dasmw(x)        do { dasmb(x); dasmb((x)>>8); } while (0)
 370 #define dasmd(x)        do { dasmw(x); dasmw((x)>>16); } while (0)
 371 #define dasmq(x)        do { dasmd(x); dasmd((x)>>32); } while (0)
 372 #endif
 373 static unsigned char *dasma_(unsigned char *cp, ptrdiff_t x)
 374 {
 375   if (sizeof(ptrdiff_t) == 8)
 376     dasmq((unsigned long long)x);
 377   else
 378     dasmd((unsigned int)x);
 379   return cp;
 380 }
 381 #define dasma(x)        (cp = dasma_(cp, (x)))
 382
 383 /* Pass 3: Encode sections. */
 384 int dasm_encode(Dst_DECL, void *buffer)
 385 {
 386   dasm_State *D = Dst_REF;
 387   unsigned char *base = (unsigned char *)buffer;
 388   unsigned char *cp = base;
 389   int secnum;
 390
 391   /* Encode all code sections. No support for data sections (yet). */
 392   for (secnum = 0; secnum < D->maxsection; secnum++) {
 393     dasm_Section *sec = D->sections + secnum;
 394     int *b = sec->buf;
 395     int *endb = sec->rbuf + sec->pos;
 396
 397     while (b != endb) {
 398       dasm_ActList p = D->actionlist + *b++;
 399       unsigned char *mark = NULL;
 400       while (1) {
 401         int action = *p++;
 402         int n = (action >= DASM_DISP && action <= DASM_ALIGN) ? *b++ : 0;
 403         switch (action) {
 404         case DASM_DISP: if (!mark) mark = cp; {
 405           unsigned char *mm = mark;
 406           if (*p != DASM_IMM_DB && *p != DASM_IMM_WB) mark = NULL;
 407           if (n == 0) { int mrm = mm[-1]&7; if (mrm == 4) mrm = mm[0]&7;
 408             if (mrm != 5) { mm[-1] -= 0x80; break; } }
 409           if (((n+128) & -256) != 0) goto wd; else mm[-1] -= 0x40;
 410         }
 411           /* fallthrough */
 412         case DASM_IMM_S: case DASM_IMM_B: wb: dasmb(n); break;
 413         case DASM_IMM_DB: if (((n+128)&-256) == 0) {
 414             db: if (!mark) mark = cp; mark[-2] += 2; mark = NULL; goto wb;
 415           } else mark = NULL;
 416           /* fallthrough */
 417         case DASM_IMM_D: wd: dasmd(n); break;
 418         case DASM_IMM_WB: if (((n+128)&-256) == 0) goto db; else mark = NULL;
 419           /* fallthrough */
 420         case DASM_IMM_W: dasmw(n); break;
 421         case DASM_VREG: {
 422           int t = *p++;
 423           unsigned char *ex = cp - (t&7);
 424           if ((n & 8) && t < 0xa0) {
 425             if (*ex & 0x80) ex[1] ^= 0x20 << (t>>6); else *ex ^= 1 << (t>>6);
 426             n &= 7;
 427           } else if (n & 0x10) {
 428             if (*ex & 0x80) {
 429               *ex = 0xc5; ex[1] = (ex[1] & 0x80) | ex[2]; ex += 2;
 430             }
 431             while (++ex < cp) ex[-1] = *ex;
 432             if (mark) mark--;
 433             cp--;
 434             n &= 7;
 435           }
 436           if (t >= 0xc0) n <<= 4;
 437           else if (t >= 0x40) n <<= 3;
 438           else if (n == 4 && t < 0x20) { cp[-1] ^= n; *cp++ = 0x20; }
 439           cp[-1] ^= n;
 440           break;
 441         }
 442         case DASM_REL_LG: p++; if (n >= 0) goto rel_pc;
 443           b++; n = (int)(ptrdiff_t)D->globals[-n-10];
 444           /* fallthrough */
 445         case DASM_REL_A: rel_a:
 446           n -= (unsigned int)(ptrdiff_t)(cp+4); goto wd; /* !x64 */
 447         case DASM_REL_PC: rel_pc: {
 448           int shrink = *b++;
 449           int *pb = DASM_POS2PTR(D, n); if (*pb < 0) { n = pb[1]; goto rel_a; }
 450           n = *pb - ((int)(cp-base) + 4-shrink);
 451           if (shrink == 0) goto wd;
 452           if (shrink == 4) { cp--; cp[-1] = *cp-0x10; } else cp[-1] = 0xeb;
 453           goto wb;
 454         }
 455         case DASM_IMM_LG:
 456           p++;
 457           if (n < 0) { dasma((ptrdiff_t)D->globals[-n-10]); break; }
 458           /* fallthrough */
 459         case DASM_IMM_PC: {
 460           int *pb = DASM_POS2PTR(D, n);
 461           dasma(*pb < 0 ? (ptrdiff_t)pb[1] : (*pb + (ptrdiff_t)base));
 462           break;
 463         }
 464         case DASM_LABEL_LG: {
 465           int idx = *p++;
 466           if (idx >= 10)
 467             D->globals[idx-10] = (void *)(base + (*p == DASM_SETLABEL ? *b : n));
 468           break;
 469         }
 470         case DASM_LABEL_PC: case DASM_SETLABEL: break;
 471         case DASM_SPACE: { int fill = *p++; while (n--) *cp++ = fill; break; }
 472         case DASM_ALIGN:
 473           n = *p++;
 474           while (((cp-base) & n)) *cp++ = 0x90; /* nop */
 475           break;
 476         case DASM_EXTERN: n = DASM_EXTERN(Dst, cp, p[1], *p); p += 2; goto wd;
 477         case DASM_MARK: mark = cp; break;
 478         case DASM_ESC: action = *p++;
 479           /* fallthrough */
 480         default: *cp++ = action; break;
 481         case DASM_SECTION: case DASM_STOP: goto stop;
 482         }
 483       }
 484       stop: (void)0;
 485     }
 486   }
 487
 488   if (base + D->codesize != cp)  /* Check for phase errors. */
 489     return DASM_S_PHASE;
 490   return DASM_S_OK;
 491 }
 492
 493 /* Get PC label offset. */
 494 int dasm_getpclabel(Dst_DECL, unsigned int pc)
 495 {
 496   dasm_State *D = Dst_REF;
 497   if (pc*sizeof(int) < D->pcsize) {
 498     int pos = D->pclabels[pc];
 499     if (pos < 0) return *DASM_POS2PTR(D, -pos);
 500     if (pos > 0) return -1;  /* Undefined. */
 501   }
 502   return -2;  /* Unused or out of range. */
 503 }
 504
 505 #ifdef DASM_CHECKS
 506 /* Optional sanity checker to call between isolated encoding steps. */
 507 int dasm_checkstep(Dst_DECL, int secmatch)
 508 {
 509   dasm_State *D = Dst_REF;
 510   if (D->status == DASM_S_OK) {
 511     int i;
 512     for (i = 1; i <= 9; i++) {
 513       if (D->lglabels[i] > 0) { D->status = DASM_S_UNDEF_L|i; break; }
 514       D->lglabels[i] = 0;
 515     }
 516   }
 517   if (D->status == DASM_S_OK && secmatch >= 0 &&
 518       D->section != &D->sections[secmatch])
 519     D->status = DASM_S_MATCH_SEC|(int)(D->section-D->sections);
 520   return D->status;
 521 }
 522 #endif
 523