Shamusworld >> Repos - rmac/blob - mark.c

   1 //
   2 // RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
   3 // MARK.C - A record of things that are defined relative to any of the sections
   4 // Copyright (C) 199x Landon Dyer, 2011-2012 Reboot and Friends
   5 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
   6 // Source Utilised with the Kind Permission of Landon Dyer
   7 //
   8
   9 #include "mark.h"
  10 #include "error.h"
  11 #include "object.h"
  12 #include "risca.h"
  13
  14
  15 MCHUNK * firstmch;              // First mark chunk
  16 MCHUNK * curmch;                // Current mark chunk
  17 PTR markptr;                    // Deposit point in current mark chunk
  18 LONG mcalloc;                   // #bytes alloc'd to current mark chunk
  19 LONG mcused;                    // #bytes used in current mark chunk
  20 uint16_t curfrom;                       // Current "from" section
  21
  22
  23 //#define DEBUG_IMAGE_MARKING
  24
  25
  26 //
  27 // Initialize Marker
  28 //
  29 void init_mark(void)
  30 {
  31         firstmch = curmch = NULL;
  32         mcalloc = mcused = 0;
  33         curfrom = 0;
  34 }
  35
  36
  37 //
  38 // Wrap up marker (called after final mark is made)
  39 //
  40 void stopmark(void)
  41 {
  42         if (curmch)
  43         {
  44                 *markptr.wp = MCHEND;           // Mark end of block
  45                 curmch->mcused = mcused;        // Update #used in mark block
  46         }
  47 }
  48
  49
  50 //
  51 // Mark a word or longword relocatable
  52 //
  53 int rmark(uint16_t from, uint32_t loc, uint16_t to, uint16_t size, SYM * symbol)
  54 {
  55 #ifdef DEBUG_IMAGE_MARKING
  56 printf("rmark: from=%i, loc=$%X, to=$%X, size=$%x, symbol=$%X\n", from, loc, to, size, symbol);
  57 #endif
  58 //      uint16_t w;
  59
  60         if ((mcalloc - mcused) < MIN_MARK_MEM)
  61                 amark();
  62
  63         uint16_t flags = (size | to);
  64
  65         if (from != curfrom)
  66                 flags |= MCHFROM;
  67
  68         if (symbol != NULL)
  69                 flags |= MSYMBOL;
  70
  71         mcused += sizeof(WORD) + sizeof(LONG);
  72         *markptr.wp++ = flags;
  73         *markptr.lp++ = loc;
  74
  75         if (flags & MCHFROM)
  76         {
  77                 curfrom = from;
  78                 *markptr.wp++ = from;
  79                 mcused += sizeof(WORD);
  80         }
  81
  82         if (flags & MSYMBOL)
  83         {
  84                 *markptr.sy++ = symbol;
  85                 mcused += sizeof(SYM *);
  86         }
  87
  88         *markptr.wp = 0x0000;
  89
  90         return 0;
  91 }
  92
  93
  94 //
  95 // Allocate another chunk of mark space
  96 //
  97 int amark(void)
  98 {
  99 //      MCHUNK * p;
 100
 101         // Alloc mark block header (and data) and set it up.
 102 //      p = (MCHUNK *)amem((long)(sizeof(MCHUNK)) + MARK_ALLOC_INCR);
 103         MCHUNK * p = (MCHUNK *)malloc(sizeof(MCHUNK) + MARK_ALLOC_INCR);
 104         p->mcnext = NULL;
 105         p->mcalloc = MARK_ALLOC_INCR;
 106         p->mcptr.cp = (char *)(((char *)p) + sizeof(MCHUNK));
 107
 108         if (curmch)
 109         {
 110                 // Link onto previous chunk
 111                 *markptr.wp++ = MCHEND;         // Mark end of block
 112                 curmch->mcused = mcused;
 113                 curmch->mcnext = p;
 114         }
 115
 116         if (!firstmch)
 117                 firstmch = p;
 118
 119         curmch = p;                                             // Setup global vars
 120         markptr = p->mcptr;
 121         mcalloc = MARK_ALLOC_INCR;
 122         mcused = 0;
 123
 124         return 0;
 125 }
 126
 127
 128 //
 129 // Make mark image for BSD .o file
 130 //
 131 uint32_t bsdmarkimg(char * mp, LONG siz, LONG tsize, int reqseg)
 132 {
 133         MCHUNK * mch;                           // Mark chunk
 134         PTR p;                                          // Source point from within mark chunk
 135         uint16_t from;                          // Section fixups are currently FROM
 136         uint16_t w;                                     // A word (temp)
 137         uint32_t loc;                           // Location (temp)
 138         SYM * symbol;                           // Symbols (temp)
 139         uint8_t * wp;                           // Pointer into raw relocation info
 140         uint8_t * dp;                           // Deposit point for RELMOD info
 141         uint32_t diff;                          // Difference to relocate (RELMOD)
 142         uint32_t raddr, rflag = 0;      // BSD relocation address and flags
 143         uint32_t rsize;                         // Relocation size
 144         int validsegment = 0;           // Valid segment being processed
 145
 146 #ifdef DEBUG_IMAGE_MARKING
 147 printf("bsdmarkimg():\n");
 148 #endif
 149         // Initialise relocation size
 150         rsize = 0;
 151         chptr = mp;
 152         from = 0;
 153
 154         for(mch=firstmch; mch!=NULL; mch=mch->mcnext)
 155         {
 156                 for(p=mch->mcptr;;)
 157                 {
 158                         w = *p.wp++;                    // Next mark entry
 159
 160                         if (w & MCHEND)
 161                                 break;                          // End of mark chunk
 162
 163                         // Get mark record
 164                         symbol = NULL;
 165                         loc = *p.lp++;                  // Mark location
 166
 167                         if (w & MCHFROM)
 168                         {
 169                                 // Maybe change "from" section
 170                                 from = *p.wp++;
 171
 172                                 if (obj_format == BSD)
 173                                 {
 174                                         if (reqseg == TEXT)
 175                                         {
 176                                                 // Requested segment is TEXT
 177                                                 if (from == TEXT)
 178                                                         validsegment = 1;
 179                                                 else
 180                                                         validsegment = 0;
 181                                         }
 182                                         else
 183                                         {
 184                                                 // Requested segment is DATA
 185                                                 if (from == DATA)
 186                                                         validsegment = 1;
 187                                                 else
 188                                                         validsegment = 0;
 189                                         }
 190                                 }
 191                         }
 192
 193                         if (w & MSYMBOL)                        // Maybe includes a symbol
 194                                 symbol = *p.sy++;
 195
 196                         if (obj_format == BSD)
 197                         {
 198                                 raddr = loc;                    // Set relocation address
 199
 200                                 if (validsegment)
 201 #ifdef DEBUG_IMAGE_MARKING
 202 {
 203 printf(" validsegment: raddr = $%08X\n", raddr);
 204 #endif
 205                                         D_long(raddr);          // Write relocation address
 206 #ifdef DEBUG_IMAGE_MARKING
 207 }
 208 #endif
 209
 210                                 if (w & MPCREL)
 211                                         rflag = 0x000000A0;     // PC-relative fixup
 212                                 else
 213                                         rflag = 0x00000040;     // Absolute fixup
 214
 215                                 if (w & MMOVEI)
 216                                         rflag |= 0x00000001;
 217                         }
 218
 219                         // Compute mark position in relocation information;
 220                         // in RELMOD mode, get address of data to fix up.
 221                         if (from == DATA)
 222                                 loc += tsize;
 223
 224                         wp = (uint8_t *)(mp + loc);
 225
 226                         if (symbol)
 227                         {
 228                                 // Deposit external reference
 229                                 if (obj_format == BSD)
 230                                 {
 231                                         rflag |= 0x00000010;                    // Set external reloc flag bit
 232                                         rflag |= (symbol->senv << 8);   // Put symbol index in flags
 233
 234                                         if (symbol->sattre & RISCSYM)
 235                                                 rflag |= 0x00000001;
 236
 237                                         if (validsegment)
 238                                         {
 239 #ifdef DEBUG_IMAGE_MARKING
 240 printf("  validsegment(2): rflag = $%08X\n", rflag);
 241 #endif
 242                                                 D_long(rflag);                          // Write relocation flags
 243                                                 rsize += 8;                                     // Increment relocation size
 244                                         }
 245                                 }
 246                         }
 247                         else
 248                         {
 249                                 if (obj_format == BSD)
 250                                 {
 251 #ifdef DEBUG_IMAGE_MARKING
 252 printf("  w = $%04X\n", w);
 253 #endif
 254                                         w &= TDB;                                               // Set reloc flags to segment
 255
 256                                         switch (w)
 257                                         {
 258                                         case TEXT: rflag |= 0x00000400; break;
 259                                         case DATA: rflag |= 0x00000600; break;
 260                                         case BSS:  rflag |= 0x00000800; break;
 261                                         }
 262
 263                                         if (validsegment)
 264                                         {
 265 #ifdef DEBUG_IMAGE_MARKING
 266 printf("  validsegment(3): rflag = $%08X\n", rflag);
 267 #endif
 268                                                 D_long(rflag);                          // Write relocation flags
 269                                                 rsize += 8;                                     // Increment relocation size
 270                                         }
 271
 272                                         w &= TDB;
 273
 274                                         if (validsegment)
 275                                         {
 276                                                 if (w & (DATA|BSS))
 277                                                 {
 278                                                         dp = objimage + BSDHDRSIZE + loc;
 279                                                         diff = ((LONG)(*dp++ & 0xFF)) << 24;
 280                                                         diff |= ((LONG)(*dp++ & 0xFF)) << 16;
 281                                                         diff |= ((LONG)(*dp++ & 0xFF)) << 8;
 282                                                         diff |= (LONG)(*dp & 0xFF);
 283                                                         DEBUG printf("diff=%ux ==> ", diff);
 284 #ifdef DEBUG_IMAGE_MARKING
 285 printf("  validsegment(4): diff = $%08X --> ", diff);
 286 #endif
 287
 288                                                         if (rflag & 0x01)
 289                                                                 diff = ((diff >> 16) & 0x0000FFFF) | ((diff << 16) & 0xFFFF0000);
 290
 291                                                         diff += sect[TEXT].sloc;
 292
 293                                                         if (w == BSS)
 294                                                                 diff += sect[DATA].sloc;
 295
 296                                                         if (rflag & 0x01)
 297                                                                 diff = ((diff >> 16) & 0x0000FFFF) | ((diff << 16) & 0xFFFF0000);
 298
 299                                                         dp = objimage + BSDHDRSIZE + loc;
 300                                                         *dp++ = (char)(diff >> 24);
 301                                                         *dp++ = (char)(diff >> 16);
 302                                                         *dp++ = (char)(diff >> 8);
 303                                                         *dp = (char)diff;
 304                                                         DEBUG printf("%ux\n", diff);
 305 #ifdef DEBUG_IMAGE_MARKING
 306 printf("$%08X\n", diff);
 307 #endif
 308                                                 }
 309                                         }
 310                                 }
 311                         }
 312                 }
 313         }
 314
 315         // Return relocation size
 316         if (obj_format == BSD)
 317 #ifdef DEBUG_IMAGE_MARKING
 318 {
 319 printf("  rsize = $%X\n", rsize);
 320 #endif
 321                 return rsize;
 322 #ifdef DEBUG_IMAGE_MARKING
 323 }
 324 #endif
 325
 326         return siz;
 327 }