linux/arch/sparc/boot/btfixupprep.c
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   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
  32static char *symtab = "SYMBOL TABLE:";
  33static char *relrec = "RELOCATION RECORDS FOR [";
  34static int rellen;
  35static int symlen;
  36int mode;
  37
  38struct _btfixup;
  39
  40typedef struct _btfixuprel {
  41        char *sect;
  42        unsigned long offset;
  43        struct _btfixup *f;
  44        int frel;
  45        struct _btfixuprel *next;
  46} btfixuprel;
  47
  48typedef struct _btfixup {
  49        int type;
  50        int setinitval;
  51        unsigned int initval;
  52        char *initvalstr;
  53        char *name;
  54        btfixuprel *rel;
  55} btfixup;
  56
  57btfixup array[MAXSYMS];
  58int last = 0;
  59char buffer[1024];
  60unsigned long lastfoffset = -1;
  61unsigned long lastfrelno;
  62btfixup *lastf;
  63
  64void fatal(void) __attribute__((noreturn));
  65void fatal(void)
  66{
  67        fprintf(stderr, "Malformed output from objdump\n%s\n", buffer);
  68        exit(1);
  69}
  70
  71btfixup *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
  91void 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
 101int 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();
 118main0:
 119        rellen = strlen(relrec);
 120        while (fgets (buffer, 1024, stdin) != NULL)
 121                if (!strncmp (buffer, relrec, rellen))
 122                        goto main1;
 123        fatal();
 124main1:
 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-initalized 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-initalized 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}
 387