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