arch/sparc/boot/btfixupprep.c

   1 /*
   2    Simple utility to prepare vmlinux image for sparc.
   3    Resolves all BTFIXUP uses and settings and creates
   4    a special .s object to link to the image.
   5
   6    Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  21
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <ctype.h>
  25 #include <errno.h>
  26 #include <unistd.h>
  27 #include <stdlib.h>
  28 #include <malloc.h>
  29
  30 #define MAXSYMS 1024
  31
  32 static char *symtab = "SYMBOL TABLE:";
  33 static char *relrec = "RELOCATION RECORDS FOR [";
  34 static int rellen;
  35 static int symlen;
  36 int mode;
  37
  38 struct _btfixup;
  39
  40 typedef struct _btfixuprel {
  41         char *sect;
  42         unsigned long offset;
  43         struct _btfixup *f;
  44         int frel;
  45         struct _btfixuprel *next;
  46 } btfixuprel;
  47
  48 typedef struct _btfixup {
  49         int type;
  50         int setinitval;
  51         unsigned int initval;
  52         char *initvalstr;
  53         char *name;
  54         btfixuprel *rel;
  55 } btfixup;
  56
  57 btfixup array[MAXSYMS];
  58 int last = 0;
  59 char buffer[1024];
  60 unsigned long lastfoffset = -1;
  61 unsigned long lastfrelno;
  62 btfixup *lastf;
  63
  64 static void fatal(void) __attribute__((noreturn));
  65 static void fatal(void)
  66 {
  67         fprintf(stderr, "Malformed output from objdump\n%s\n", buffer);
  68         exit(1);
  69 }
  70
  71 static btfixup *find(int type, char *name)
  72 {
  73         int i;
  74         for (i = 0; i < last; i++) {
  75                 if (array[i].type == type && !strcmp(array[i].name, name))
  76                         return array + i;
  77         }
  78         array[last].type = type;
  79         array[last].name = strdup(name);
  80         array[last].setinitval = 0;
  81         if (!array[last].name) fatal();
  82         array[last].rel = NULL;
  83         last++;
  84         if (last >= MAXSYMS) {
  85                 fprintf(stderr, "Ugh. Something strange. More than %d different BTFIXUP symbols\n", MAXSYMS);
  86                 exit(1);
  87         }
  88         return array + last - 1;
  89 }
  90
  91 static void set_mode (char *buffer)
  92 {
  93         for (mode = 0;; mode++)
  94                 if (buffer[mode] < '0' || buffer[mode] > '9')
  95                         break;
  96         if (mode != 8 && mode != 16)
  97                 fatal();
  98 }
  99
 100
 101 int main(int argc,char **argv)
 102 {
 103         char *p, *q;
 104         char *sect;
 105         int i, j, k;
 106         unsigned int initval;
 107         int shift;
 108         btfixup *f;
 109         btfixuprel *r, **rr;
 110         unsigned long offset;
 111         char *initvalstr;
 112
 113         symlen = strlen(symtab);
 114         while (fgets (buffer, 1024, stdin) != NULL)
 115                 if (!strncmp (buffer, symtab, symlen))
 116                         goto main0;
 117         fatal();
 118 main0:
 119         rellen = strlen(relrec);
 120         while (fgets (buffer, 1024, stdin) != NULL)
 121                 if (!strncmp (buffer, relrec, rellen))
 122                         goto main1;
 123         fatal();
 124 main1:
 125         sect = malloc(strlen (buffer + rellen) + 1);
 126         if (!sect) fatal();
 127         strcpy (sect, buffer + rellen);
 128         p = strchr (sect, ']');
 129         if (!p) fatal();
 130         *p = 0;
 131         if (fgets (buffer, 1024, stdin) == NULL)
 132                 fatal();
 133         while (fgets (buffer, 1024, stdin) != NULL) {
 134                 int nbase;
 135                 if (!strncmp (buffer, relrec, rellen))
 136                         goto main1;
 137                 if (mode == 0)
 138                         set_mode (buffer);
 139                 p = strchr (buffer, '\n');
 140                 if (p) *p = 0;
 141                 if (strlen (buffer) < 22+mode)
 142                         continue;
 143                 if (strncmp (buffer + mode, " R_SPARC_", 9))
 144                         continue;
 145                 nbase = 27 - 8 + mode;
 146                 if (buffer[nbase] != '_' || buffer[nbase+1] != '_' || buffer[nbase+2] != '_')
 147                         continue;
 148                 switch (buffer[nbase+3]) {
 149                         case 'f':       /* CALL */
 150                         case 'b':       /* BLACKBOX */
 151                         case 's':       /* SIMM13 */
 152                         case 'a':       /* HALF */
 153                         case 'h':       /* SETHI */
 154                         case 'i':       /* INT */
 155                                 break;
 156                         default:
 157                                 continue;
 158                 }
 159                 p = strchr (buffer + nbase+5, '+');
 160                 if (p) *p = 0;
 161                 shift = nbase + 5;
 162                 if (buffer[nbase+4] == 's' && buffer[nbase+5] == '_') {
 163                         shift = nbase + 6;
 164                         if (strcmp (sect, ".init.text")) {
 165                                 fprintf(stderr,
 166                                     "Wrong use of '%s' BTFIXUPSET in '%s' section.\n"
 167                                     "BTFIXUPSET_CALL can be used only in"
 168                                     " __init sections\n",
 169                                     buffer + shift, sect);
 170                                 exit(1);
 171                         }
 172                 } else if (buffer[nbase+4] != '_')
 173                         continue;
 174                 if (!strcmp (sect, ".text.exit"))
 175                         continue;
 176                 if (strcmp (sect, ".text") &&
 177                     strcmp (sect, ".init.text") &&
 178                     strcmp (sect, ".fixup") &&
 179                     (strcmp (sect, "__ksymtab") || buffer[nbase+3] != 'f')) {
 180                         if (buffer[nbase+3] == 'f')
 181                                 fprintf(stderr,
 182                                     "Wrong use of '%s' in '%s' section.\n"
 183                                     " It can be used only in .text, .init.text,"
 184                                     " .fixup and __ksymtab\n",
 185                                     buffer + shift, sect);
 186                         else
 187                                 fprintf(stderr,
 188                                     "Wrong use of '%s' in '%s' section.\n"
 189                                     " It can be only used in .text, .init.text,"
 190                                     " and .fixup\n", buffer + shift, sect);
 191                         exit(1);
 192                 }
 193                 p = strstr (buffer + shift, "__btset_");
 194                 if (p && buffer[nbase+4] == 's') {
 195                         fprintf(stderr, "__btset_ in BTFIXUP name can only be used when defining the variable, not for setting\n%s\n", buffer);
 196                         exit(1);
 197                 }
 198                 initval = 0;
 199                 initvalstr = NULL;
 200                 if (p) {
 201                         if (p[8] != '0' || p[9] != 'x') {
 202                                 fprintf(stderr, "Pre-initialized values can be only initialized with hexadecimal constants starting 0x\n%s\n", buffer);
 203                                 exit(1);
 204                         }
 205                         initval = strtoul(p + 10, &q, 16);
 206                         if (*q || !initval) {
 207                                 fprintf(stderr, "Pre-initialized values can be only in the form name__btset_0xXXXXXXXX where X are hex digits.\nThey cannot be name__btset_0x00000000 though. Use BTFIXUPDEF_XX instead of BTFIXUPDEF_XX_INIT then.\n%s\n", buffer);
 208                                 exit(1);
 209                         }
 210                         initvalstr = p + 10;
 211                         *p = 0;
 212                 }
 213                 f = find(buffer[nbase+3], buffer + shift);
 214                 if (buffer[nbase+4] == 's')
 215                         continue;
 216                 switch (buffer[nbase+3]) {
 217                 case 'f':
 218                         if (initval) {
 219                                 fprintf(stderr, "Cannot use pre-initialized fixups for calls\n%s\n", buffer);
 220                                 exit(1);
 221                         }
 222                         if (!strcmp (sect, "__ksymtab")) {
 223                                 if (strncmp (buffer + mode+9, "32        ", 10)) {
 224                                         fprintf(stderr, "BTFIXUP_CALL in EXPORT_SYMBOL results in relocation other than R_SPARC_32\n\%s\n", buffer);
 225                                         exit(1);
 226                                 }
 227                         } else if (strncmp (buffer + mode+9, "WDISP30   ", 10) &&
 228                                    strncmp (buffer + mode+9, "HI22      ", 10) &&
 229                                    strncmp (buffer + mode+9, "LO10      ", 10)) {
 230                                 fprintf(stderr, "BTFIXUP_CALL results in relocation other than R_SPARC_WDISP30, R_SPARC_HI22 or R_SPARC_LO10\n%s\n", buffer);
 231                                 exit(1);
 232                         }
 233                         break;
 234                 case 'b':
 235                         if (initval) {
 236                                 fprintf(stderr, "Cannot use pre-initialized fixups for blackboxes\n%s\n", buffer);
 237                                 exit(1);
 238                         }
 239                         if (strncmp (buffer + mode+9, "HI22      ", 10)) {
 240                                 fprintf(stderr, "BTFIXUP_BLACKBOX results in relocation other than R_SPARC_HI22\n%s\n", buffer);
 241                                 exit(1);
 242                         }
 243                         break;
 244                 case 's':
 245                         if (initval + 0x1000 >= 0x2000) {
 246                                 fprintf(stderr, "Wrong initializer for SIMM13. Has to be from $fffff000 to $00000fff\n%s\n", buffer);
 247                                 exit(1);
 248                         }
 249                         if (strncmp (buffer + mode+9, "13        ", 10)) {
 250                                 fprintf(stderr, "BTFIXUP_SIMM13 results in relocation other than R_SPARC_13\n%s\n", buffer);
 251                                 exit(1);
 252                         }
 253                         break;
 254                 case 'a':
 255                         if (initval + 0x1000 >= 0x2000 && (initval & 0x3ff)) {
 256                                 fprintf(stderr, "Wrong initializer for HALF.\n%s\n", buffer);
 257                                 exit(1);
 258                         }
 259                         if (strncmp (buffer + mode+9, "13        ", 10)) {
 260                                 fprintf(stderr, "BTFIXUP_HALF results in relocation other than R_SPARC_13\n%s\n", buffer);
 261                                 exit(1);
 262                         }
 263                         break;
 264                 case 'h':
 265                         if (initval & 0x3ff) {
 266                                 fprintf(stderr, "Wrong initializer for SETHI. Cannot have set low 10 bits\n%s\n", buffer);
 267                                 exit(1);
 268                         }
 269                         if (strncmp (buffer + mode+9, "HI22      ", 10)) {
 270                                 fprintf(stderr, "BTFIXUP_SETHI results in relocation other than R_SPARC_HI22\n%s\n", buffer);
 271                                 exit(1);
 272                         }
 273                         break;
 274                 case 'i':
 275                         if (initval) {
 276                                 fprintf(stderr, "Cannot use pre-initialized fixups for INT\n%s\n", buffer);
 277                                 exit(1);
 278                         }
 279                         if (strncmp (buffer + mode+9, "HI22      ", 10) && strncmp (buffer + mode+9, "LO10      ", 10)) {
 280                                 fprintf(stderr, "BTFIXUP_INT results in relocation other than R_SPARC_HI22 and R_SPARC_LO10\n%s\n", buffer);
 281                                 exit(1);
 282                         }
 283                         break;
 284                 }
 285                 if (!f->setinitval) {
 286                         f->initval = initval;
 287                         if (initvalstr) {
 288                                 f->initvalstr = strdup(initvalstr);
 289                                 if (!f->initvalstr) fatal();
 290                         }
 291                         f->setinitval = 1;
 292                 } else if (f->initval != initval) {
 293                         fprintf(stderr, "Btfixup %s previously used with initializer %s which doesn't match with current initializer\n%s\n",
 294                                         f->name, f->initvalstr ? : "0x00000000", buffer);
 295                         exit(1);
 296                 } else if (initval && strcmp(f->initvalstr, initvalstr)) {
 297                         fprintf(stderr, "Btfixup %s previously used with initializer %s which doesn't match with current initializer.\n"
 298                                         "Initializers have to match literally as well.\n%s\n",
 299                                         f->name, f->initvalstr, buffer);
 300                         exit(1);
 301                 }
 302                 offset = strtoul(buffer, &q, 16);
 303                 if (q != buffer + mode || (!offset && (mode == 8 ? strncmp (buffer, "00000000 ", 9) : strncmp (buffer, "0000000000000000 ", 17)))) {
 304                         fprintf(stderr, "Malformed relocation address in\n%s\n", buffer);
 305                         exit(1);
 306                 }
 307                 for (k = 0, r = f->rel, rr = &f->rel; r; rr = &r->next, r = r->next, k++)
 308                         if (r->offset == offset && !strcmp(r->sect, sect)) {
 309                                 fprintf(stderr, "Ugh. One address has two relocation records\n");
 310                                 exit(1);
 311                         }
 312                 *rr = malloc(sizeof(btfixuprel));
 313                 if (!*rr) fatal();
 314                 (*rr)->offset = offset;
 315                 (*rr)->f = NULL;
 316                 if (buffer[nbase+3] == 'f') {
 317                         lastf = f;
 318                         lastfoffset = offset;
 319                         lastfrelno = k;
 320                 } else if (lastfoffset + 4 == offset) {
 321                         (*rr)->f = lastf;
 322                         (*rr)->frel = lastfrelno;
 323                 }
 324                 (*rr)->sect = sect;
 325                 (*rr)->next = NULL;
 326         }
 327         printf("! Generated by btfixupprep. Do not edit.\n\n");
 328         printf("\t.section\t\".data..init\",#alloc,#write\n\t.align\t4\n\n");
 329         printf("\t.global\t___btfixup_start\n___btfixup_start:\n\n");
 330         for (i = 0; i < last; i++) {
 331                 f = array + i;
 332                 printf("\t.global\t___%cs_%s\n", f->type, f->name);
 333                 if (f->type == 'f')
 334                         printf("___%cs_%s:\n\t.word 0x%08x,0,0,", f->type, f->name, f->type << 24);
 335                 else
 336                         printf("___%cs_%s:\n\t.word 0x%08x,0,", f->type, f->name, f->type << 24);
 337                 for (j = 0, r = f->rel; r != NULL; j++, r = r->next);
 338                 if (j)
 339                         printf("%d\n\t.word\t", j * 2);
 340                 else
 341                         printf("0\n");
 342                 for (r = f->rel, j--; r != NULL; j--, r = r->next) {
 343                         if (!strcmp (r->sect, ".text"))
 344                                 printf ("_stext+0x%08lx", r->offset);
 345                         else if (!strcmp (r->sect, ".init.text"))
 346                                 printf ("__init_begin+0x%08lx", r->offset);
 347                         else if (!strcmp (r->sect, "__ksymtab"))
 348                                 printf ("__start___ksymtab+0x%08lx", r->offset);
 349                         else if (!strcmp (r->sect, ".fixup"))
 350                                 printf ("__start___fixup+0x%08lx", r->offset);
 351                         else
 352                                 fatal();
 353                         if (f->type == 'f' || !r->f)
 354                                 printf (",0");
 355                         else
 356                                 printf (",___fs_%s+0x%08x", r->f->name, (4 + r->frel*2)*4 + 4);
 357                         if (j) printf (",");
 358                         else printf ("\n");
 359                 }
 360                 printf("\n");
 361         }
 362         printf("\n\t.global\t___btfixup_end\n___btfixup_end:\n");
 363         printf("\n\n! Define undefined references\n\n");
 364         for (i = 0; i < last; i++) {
 365                 f = array + i;
 366                 if (f->type == 'f') {
 367                         printf("\t.global\t___f_%s\n", f->name);
 368                         printf("___f_%s:\n", f->name);
 369                 }
 370         }
 371         printf("\tretl\n\t nop\n\n");
 372         for (i = 0; i < last; i++) {
 373                 f = array + i;
 374                 if (f->type != 'f') {
 375                         if (!f->initval) {
 376                                 printf("\t.global\t___%c_%s\n", f->type, f->name);
 377                                 printf("___%c_%s = 0\n", f->type, f->name);
 378                         } else {
 379                                 printf("\t.global\t___%c_%s__btset_0x%s\n", f->type, f->name, f->initvalstr);
 380                                 printf("___%c_%s__btset_0x%s = 0x%08x\n", f->type, f->name, f->initvalstr, f->initval);
 381                         }
 382                 }
 383         }
 384         printf("\n\n");
 385         exit(0);
 386 }