2.9BSD - /usr/src/sys/GENERIC/checksys.c

   1: /*
   2:  * checksys
   3:  *	checks the system size and reports any limits exceeded.
   4:  */
   5: 
   6: #include "param.h"
   7: #include <a.out.h>
   8: #include <stdio.h>
   9: #include <sys/tty.h>
  10: 
  11: #define KB  * 1024
  12: 
  13: /*
  14:  *  Round up to a click boundary.
  15:  */
  16: #define cround(bytes)   ((bytes + ctob(1) - 1) / ctob(1) * ctob(1));
  17: 
  18: struct exec obj;
  19: struct ovlhdr   ovlhdr;
  20: 
  21: struct nlist nl[] =
  22: {
  23:     "_end", 0, 0,
  24: #define N_END       0
  25:     "_remap_a", 0, 0,
  26: #define N_REMAPAREA 1
  27:     "NOKA5", 0, 0,
  28: #define N_NOKA5     2
  29:     "_nbuf", 0, 0,
  30: #define N_NBUF      3
  31:     "_bsize", 0, 0,
  32: #define N_BSIZE     4
  33:     "UCB_CLIST", 0, 0,
  34: #define N_CLIST     5
  35:     "_nclist", 0, 0,
  36: #define N_NCLIST    6
  37:     0
  38: };
  39: 
  40: char *file;
  41: int fi;
  42: 
  43: main(argc,argv)
  44: int argc;
  45: char **argv;
  46: {
  47:     register i;
  48:     long size, totsize;
  49:     int errs = 0;
  50:     int texterrs = 0;
  51: 
  52:     if (argc != 2) {
  53:         fprintf(stderr, "Usage: %s unix-binary\n", argv[0]);
  54:         exit(20);
  55:     }
  56:     file = argv[1];
  57:     if ((fi=open(file,0)) < 0)
  58:     {
  59:         perror(file);
  60:         exit(20);
  61:     }
  62:     if (read(fi,&obj,sizeof(obj)) != sizeof(obj))
  63:     {
  64:         printf("%s is not an object file.\n", file);
  65:         close(fi);
  66:         exit(20);
  67:     }
  68:     if (obj.a_magic == A_MAGIC5 || obj.a_magic == A_MAGIC6)
  69:         if (read(fi,&ovlhdr,sizeof(ovlhdr)) != sizeof(ovlhdr)) {
  70:             printf("%s is not an object file.\n", file);
  71:             close(fi);
  72:             exit(20);
  73:         }
  74:     switch(obj.a_magic)
  75:     {
  76: 
  77:     /*
  78: 	 *	0407-- nonseparate I/D "vanilla"
  79: 	 */
  80:     case A_MAGIC1:
  81:         size = (long)obj.a_text + obj.a_data + obj.a_bss;
  82:         if (size > (unsigned) 48 KB) {
  83:             printf("Total size too large by %D bytes.\n",
  84:                 size - (unsigned) 48 KB);
  85:             errs++;
  86:         }
  87:         totsize = cround(size);
  88:         break;
  89: 
  90:     /*
  91: 	 *	0411-- separate I/D
  92: 	 */
  93:     case A_MAGIC3:
  94:         size = (long) obj.a_data + obj.a_bss;
  95:         if (size > (unsigned) 48 KB) {
  96:             printf("Data too large by %D bytes.\n",
  97:                 size - (unsigned) 48 KB);
  98:             errs++;
  99:         }
 100:         totsize = obj.a_text + cround(size);
 101:         break;
 102: 
 103:     /*
 104: 	 *	0430-- overlaid nonseparate I/D
 105: 	 */
 106:     case A_MAGIC5:
 107:         if (obj.a_text > 16 KB) {
 108:             printf("Base segment too large by %u bytes.\n",
 109:                 obj.a_text - 16 KB);
 110:             errs++;
 111:             texterrs++;
 112:         }
 113:         if (obj.a_text <= 8 KB) {
 114:             printf("Base segment too small by %u bytes.\n",
 115:                 8 KB - obj.a_text);
 116:             errs++;
 117:         }
 118:         size = (long) obj.a_data + obj.a_bss;
 119:         if (size > 24 KB) {
 120:             printf("Data too large by %D bytes.\n", size - 24 KB);
 121:             errs++;
 122:         }
 123:         /*
 124: 		 *  Base and overlay 1 occupy 16K and 8K of physical
 125: 		 *  memory, respectively, regardless of actual size.
 126: 		 */
 127:         totsize = 24 KB + cround(size);
 128:         /*
 129: 		 *  Subtract the first overlay, it will be added below
 130: 		 *  and it has already been included.
 131: 		 */
 132:         totsize -= ovlhdr.ov_siz[0];
 133:         goto checkov;
 134:         break;
 135: 
 136:     /*
 137: 	 *	0431-- overlaid separate I/D
 138: 	 */
 139:     case A_MAGIC6:
 140:         if (obj.a_text > (unsigned) 56 KB) {
 141:             printf("Base segment too large by %u bytes.\n",
 142:                 obj.a_text - (unsigned) 56 KB);
 143:             errs++;
 144:         }
 145:         if (obj.a_text <= (unsigned) 48 KB) {
 146:             printf("Base segment too small by %u bytes.\n",
 147:                 (unsigned) 48 KB - obj.a_text);
 148:             errs++;
 149:         }
 150:         size = (long)obj.a_data + obj.a_bss;
 151:         if (size > (unsigned) 48 KB) {
 152:             printf("Data too large by %D bytes.\n",
 153:                 size - (unsigned) 48 KB);
 154:             errs++;
 155:         }
 156:         totsize = (long)obj.a_text + cround(size);
 157: checkov:
 158:         for (i=0; i<NOVL; i++) {
 159:             totsize += ovlhdr.ov_siz[i];
 160:             if (ovlhdr.ov_siz[i] > 8 KB) {
 161:                 printf("Overlay %d too large by %u bytes.\n",
 162:                 i+1, ovlhdr.ov_siz[i] - 8 KB);
 163:                 errs++;
 164:                 texterrs++;
 165:             }
 166:         }
 167:         break;
 168: 
 169:     default:
 170:         printf("Magic number not recognized.\n");
 171:         close(fi);
 172:         exit(20);
 173:     }
 174: 
 175:     nlist(file, nl);
 176:     if (nl[N_NOKA5].n_type == 0) {
 177:         fprintf(stderr, "Symbols not found in namelist\n");
 178:         exit(20);
 179:     }
 180:     if (texterrs == 0) {
 181:         if (nl[N_NOKA5].n_value == 0) {
 182:         if (nl[N_REMAPAREA].n_value >= 0120000) {
 183: printf("The remapping area (0120000-0140000, KDSD5)\n");
 184: printf("contains data other than the proc, text and file tables.\n");
 185: printf("Reduce other data by %u bytes.\n", nl[N_REMAPAREA].n_value - 0120000);
 186:             errs++;
 187:         }
 188:         } else {
 189:         if (nl[N_END].n_value >= 0120000) {
 190: printf("Data extends into the remapping area (0120000-0140000, KDSD5)\n");
 191: printf("by %u bytes; undefine NOKA5 or reduce data size.\n",
 192:         nl[N_END].n_value - 0120000);
 193:             errs++;
 194:         }
 195:         }
 196:     }
 197: 
 198:     totsize += cround((long) getval(N_NBUF) * (long) getval(N_BSIZE));
 199:     if (nl[N_CLIST].n_value)
 200:         totsize += cround((long) getval(N_NCLIST)
 201:             * (long) sizeof(struct cblock));
 202:     totsize += ctob(USIZE);
 203: printf("System will occupy %D bytes of memory (including buffers and clists).\n",
 204:         totsize);
 205: 
 206:     close(fi);
 207:     if (errs)
 208:         printf("**** SYSTEM IS NOT BOOTABLE.\n");
 209:     exit(errs);
 210: }
 211: 
 212: #define round(x) (ctob(stoc(ctos(btoc(x)))))
 213: /*
 214:  *  Get the value of an initialized variable from the object file.
 215:  */
 216: getval(index)
 217: {
 218:     int ret;
 219:     off_t offst;
 220: 
 221:     offst = (off_t)nl[index].n_value
 222:         + (off_t) obj.a_text + sizeof(obj);
 223:     if (obj.a_magic == A_MAGIC2 || obj.a_magic == A_MAGIC5)
 224:         offst -= (off_t)round(obj.a_text);
 225:     if (obj.a_magic == A_MAGIC5 || obj.a_magic == A_MAGIC6) {
 226:         register i;
 227:         offst += sizeof ovlhdr;
 228:         if (obj.a_magic == A_MAGIC5)
 229:             offst -= (off_t)round(ovlhdr.max_ovl);
 230:         for(i=0; i<NOVL; i++)
 231:             offst += (off_t)ovlhdr.ov_siz[i];
 232:     }
 233:     lseek(fi, offst, 0);
 234:     read(fi, &ret, sizeof(ret));
 235:     return(ret);
 236: }

Defined functions

Defined variables

Defined macros