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btfixupprep.c

/* $Id: btfixupprep.c,v 1.6 2001/08/22 15:27:47 davem Exp $
   Simple utility to prepare vmlinux image for sparc.
   Resolves all BTFIXUP uses and settings and creates
   a special .s object to link to the image.
   
   Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
   
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <malloc.h>

#define MAXSYMS 1024

static char *symtab = "SYMBOL TABLE:";
static char *relrec = "RELOCATION RECORDS FOR [";
static int rellen;
static int symlen;
int mode;

struct _btfixup;

typedef struct _btfixuprel {
      char *sect;
      unsigned long offset;
      struct _btfixup *f;
      int frel;
      struct _btfixuprel *next;
} btfixuprel;

typedef struct _btfixup {
      int type;
      int setinitval;
      unsigned int initval;
      char *initvalstr;
      char *name;
      btfixuprel *rel;
} btfixup;

btfixup array[MAXSYMS];
int last = 0;
char buffer[1024];
unsigned long lastfoffset = -1;
unsigned long lastfrelno;
btfixup *lastf;

void fatal(void) __attribute__((noreturn));
void fatal(void)
{
      fprintf(stderr, "Malformed output from objdump\n%s\n", buffer);
      exit(1);
}

btfixup *find(int type, char *name)
{
      int i;
      for (i = 0; i < last; i++) {
            if (array[i].type == type && !strcmp(array[i].name, name))
                  return array + i;
      }
      array[last].type = type;
      array[last].name = strdup(name);
      array[last].setinitval = 0;
      if (!array[last].name) fatal();
      array[last].rel = NULL;
      last++;
      if (last >= MAXSYMS) {
            fprintf(stderr, "Ugh. Something strange. More than %d different BTFIXUP symbols\n", MAXSYMS);
            exit(1);
      }
      return array + last - 1;
}

void set_mode (char *buffer)
{
      for (mode = 0;; mode++)
            if (buffer[mode] < '0' || buffer[mode] > '9')
                  break;
      if (mode != 8 && mode != 16)
            fatal();
}


int main(int argc,char **argv)
{
      char *p, *q;
      char *sect;
      int i, j, k;
      unsigned int initval;
      int shift;
      btfixup *f;
      btfixuprel *r, **rr;
      unsigned long offset;
      char *initvalstr;

      symlen = strlen(symtab);
      while (fgets (buffer, 1024, stdin) != NULL)
            if (!strncmp (buffer, symtab, symlen))
                  goto main0;
      fatal();
main0:
      rellen = strlen(relrec);
      while (fgets (buffer, 1024, stdin) != NULL)
            if (!strncmp (buffer, relrec, rellen))
                  goto main1;
      fatal();
main1:
      sect = malloc(strlen (buffer + rellen) + 1);
      if (!sect) fatal();
      strcpy (sect, buffer + rellen);
      p = strchr (sect, ']');
      if (!p) fatal();
      *p = 0;
      if (fgets (buffer, 1024, stdin) == NULL)
            fatal();
      while (fgets (buffer, 1024, stdin) != NULL) {
            int nbase;
            if (!strncmp (buffer, relrec, rellen))
                  goto main1;
            if (mode == 0)
                  set_mode (buffer);
            p = strchr (buffer, '\n');
            if (p) *p = 0;
            if (strlen (buffer) < 22+mode)
                  continue;
            if (strncmp (buffer + mode, " R_SPARC_", 9))
                  continue;
            nbase = 27 - 8 + mode;
            if (buffer[nbase] != '_' || buffer[nbase+1] != '_' || buffer[nbase+2] != '_')
                  continue;
            switch (buffer[nbase+3]) {
                  case 'f':   /* CALL */
                  case 'b':   /* BLACKBOX */
                  case 's':   /* SIMM13 */
                  case 'a':   /* HALF */
                  case 'h':   /* SETHI */
                  case 'i':   /* INT */
                        break;
                  default:
                        continue;
            }
            p = strchr (buffer + nbase+5, '+');
            if (p) *p = 0;
            shift = nbase + 5;
            if (buffer[nbase+4] == 's' && buffer[nbase+5] == '_') {
                  shift = nbase + 6;
                  if (strcmp (sect, ".init.text")) {
                        fprintf(stderr,
                            "Wrong use of '%s' BTFIXUPSET in '%s' section.\n"
                            "BTFIXUPSET_CALL can be used only in"
                            " __init sections\n",
                            buffer + shift, sect);
                        exit(1);
                  }
            } else if (buffer[nbase+4] != '_')
                  continue;
            if (!strcmp (sect, ".text.exit"))
                  continue;
            if (strcmp (sect, ".text") &&
                strcmp (sect, ".init.text") &&
                strcmp (sect, ".fixup") &&
                (strcmp (sect, "__ksymtab") || buffer[nbase+3] != 'f')) {
                  if (buffer[nbase+3] == 'f')
                        fprintf(stderr,
                            "Wrong use of '%s' in '%s' section.\n"
                            " It can be used only in .text, .init.text,"
                            " .fixup and __ksymtab\n",
                            buffer + shift, sect);
                  else
                        fprintf(stderr,
                            "Wrong use of '%s' in '%s' section.\n"
                            " It can be only used in .text, .init.text,"
                            " and .fixup\n", buffer + shift, sect);
                  exit(1);
            }
            p = strstr (buffer + shift, "__btset_");
            if (p && buffer[nbase+4] == 's') {
                  fprintf(stderr, "__btset_ in BTFIXUP name can only be used when defining the variable, not for setting\n%s\n", buffer);
                  exit(1);
            }
            initval = 0;
            initvalstr = NULL;
            if (p) {
                  if (p[8] != '0' || p[9] != 'x') {
                        fprintf(stderr, "Pre-initialized values can be only initialized with hexadecimal constants starting 0x\n%s\n", buffer);
                        exit(1);
                  }
                  initval = strtoul(p + 10, &q, 16);
                  if (*q || !initval) {
                        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);
                        exit(1);
                  }
                  initvalstr = p + 10;
                  *p = 0;
            }
            f = find(buffer[nbase+3], buffer + shift);
            if (buffer[nbase+4] == 's')
                  continue;
            switch (buffer[nbase+3]) {
            case 'f':
                  if (initval) {
                        fprintf(stderr, "Cannot use pre-initalized fixups for calls\n%s\n", buffer);
                        exit(1);
                  }
                  if (!strcmp (sect, "__ksymtab")) {
                        if (strncmp (buffer + mode+9, "32        ", 10)) {
                              fprintf(stderr, "BTFIXUP_CALL in EXPORT_SYMBOL results in relocation other than R_SPARC_32\n\%s\n", buffer);
                              exit(1);
                        }
                  } else if (strncmp (buffer + mode+9, "WDISP30   ", 10) &&
                           strncmp (buffer + mode+9, "HI22      ", 10) &&
                           strncmp (buffer + mode+9, "LO10      ", 10)) {
                        fprintf(stderr, "BTFIXUP_CALL results in relocation other than R_SPARC_WDISP30, R_SPARC_HI22 or R_SPARC_LO10\n%s\n", buffer);
                        exit(1);
                  }
                  break;
            case 'b':
                  if (initval) {
                        fprintf(stderr, "Cannot use pre-initialized fixups for blackboxes\n%s\n", buffer);
                        exit(1);
                  }
                  if (strncmp (buffer + mode+9, "HI22      ", 10)) {
                        fprintf(stderr, "BTFIXUP_BLACKBOX results in relocation other than R_SPARC_HI22\n%s\n", buffer);
                        exit(1);
                  }
                  break;
            case 's':
                  if (initval + 0x1000 >= 0x2000) {
                        fprintf(stderr, "Wrong initializer for SIMM13. Has to be from $fffff000 to $00000fff\n%s\n", buffer);
                        exit(1);
                  }
                  if (strncmp (buffer + mode+9, "13        ", 10)) {
                        fprintf(stderr, "BTFIXUP_SIMM13 results in relocation other than R_SPARC_13\n%s\n", buffer);
                        exit(1);
                  }
                  break;
            case 'a':
                  if (initval + 0x1000 >= 0x2000 && (initval & 0x3ff)) {
                        fprintf(stderr, "Wrong initializer for HALF.\n%s\n", buffer);
                        exit(1);
                  }
                  if (strncmp (buffer + mode+9, "13        ", 10)) {
                        fprintf(stderr, "BTFIXUP_HALF results in relocation other than R_SPARC_13\n%s\n", buffer);
                        exit(1);
                  }
                  break;
            case 'h':
                  if (initval & 0x3ff) {
                        fprintf(stderr, "Wrong initializer for SETHI. Cannot have set low 10 bits\n%s\n", buffer);
                        exit(1);
                  }
                  if (strncmp (buffer + mode+9, "HI22      ", 10)) {
                        fprintf(stderr, "BTFIXUP_SETHI results in relocation other than R_SPARC_HI22\n%s\n", buffer);
                        exit(1);
                  }
                  break;
            case 'i':
                  if (initval) {
                        fprintf(stderr, "Cannot use pre-initalized fixups for INT\n%s\n", buffer);
                        exit(1);
                  }
                  if (strncmp (buffer + mode+9, "HI22      ", 10) && strncmp (buffer + mode+9, "LO10      ", 10)) {
                        fprintf(stderr, "BTFIXUP_INT results in relocation other than R_SPARC_HI22 and R_SPARC_LO10\n%s\n", buffer);
                        exit(1);
                  }
                  break;
            }
            if (!f->setinitval) {
                  f->initval = initval;
                  if (initvalstr) {
                        f->initvalstr = strdup(initvalstr);
                        if (!f->initvalstr) fatal();
                  }
                  f->setinitval = 1;
            } else if (f->initval != initval) {
                  fprintf(stderr, "Btfixup %s previously used with initializer %s which doesn't match with current initializer\n%s\n",
                              f->name, f->initvalstr ? : "0x00000000", buffer);
                  exit(1);
            } else if (initval && strcmp(f->initvalstr, initvalstr)) {
                  fprintf(stderr, "Btfixup %s previously used with initializer %s which doesn't match with current initializer.\n"
                              "Initializers have to match literally as well.\n%s\n",
                              f->name, f->initvalstr, buffer);
                  exit(1);
            }
            offset = strtoul(buffer, &q, 16);
            if (q != buffer + mode || (!offset && (mode == 8 ? strncmp (buffer, "00000000 ", 9) : strncmp (buffer, "0000000000000000 ", 17)))) {
                  fprintf(stderr, "Malformed relocation address in\n%s\n", buffer);
                  exit(1);
            }
            for (k = 0, r = f->rel, rr = &f->rel; r; rr = &r->next, r = r->next, k++)
                  if (r->offset == offset && !strcmp(r->sect, sect)) {
                        fprintf(stderr, "Ugh. One address has two relocation records\n");
                        exit(1);
                  }
            *rr = malloc(sizeof(btfixuprel));
            if (!*rr) fatal();
            (*rr)->offset = offset;
            (*rr)->f = NULL;
            if (buffer[nbase+3] == 'f') {
                  lastf = f;
                  lastfoffset = offset;
                  lastfrelno = k;
            } else if (lastfoffset + 4 == offset) {
                  (*rr)->f = lastf;
                  (*rr)->frel = lastfrelno;
            }
            (*rr)->sect = sect;
            (*rr)->next = NULL;
      }
      printf("! Generated by btfixupprep. Do not edit.\n\n");
      printf("\t.section\t\".data.init\",#alloc,#write\n\t.align\t4\n\n");
      printf("\t.global\t___btfixup_start\n___btfixup_start:\n\n");
      for (i = 0; i < last; i++) {
            f = array + i;
            printf("\t.global\t___%cs_%s\n", f->type, f->name);
            if (f->type == 'f')
                  printf("___%cs_%s:\n\t.word 0x%08x,0,0,", f->type, f->name, f->type << 24);
            else
                  printf("___%cs_%s:\n\t.word 0x%08x,0,", f->type, f->name, f->type << 24);
            for (j = 0, r = f->rel; r != NULL; j++, r = r->next);
            if (j)
                  printf("%d\n\t.word\t", j * 2);
            else
                  printf("0\n");
            for (r = f->rel, j--; r != NULL; j--, r = r->next) {
                  if (!strcmp (r->sect, ".text"))
                        printf ("_stext+0x%08lx", r->offset);
                  else if (!strcmp (r->sect, ".init.text"))
                        printf ("__init_begin+0x%08lx", r->offset);
                  else if (!strcmp (r->sect, "__ksymtab"))
                        printf ("__start___ksymtab+0x%08lx", r->offset);
                  else if (!strcmp (r->sect, ".fixup"))
                        printf ("__start___fixup+0x%08lx", r->offset);
                  else
                        fatal();
                  if (f->type == 'f' || !r->f)
                        printf (",0");
                  else
                        printf (",___fs_%s+0x%08x", r->f->name, (4 + r->frel*2)*4 + 4);
                  if (j) printf (",");
                  else printf ("\n");
            }
            printf("\n");
      }
      printf("\n\t.global\t___btfixup_end\n___btfixup_end:\n");
      printf("\n\n! Define undefined references\n\n");
      for (i = 0; i < last; i++) {
            f = array + i;
            if (f->type == 'f') {
                  printf("\t.global\t___f_%s\n", f->name);
                  printf("___f_%s:\n", f->name);
            }
      }
      printf("\tretl\n\t nop\n\n");
      for (i = 0; i < last; i++) {
            f = array + i;
            if (f->type != 'f') {
                  if (!f->initval) {
                        printf("\t.global\t___%c_%s\n", f->type, f->name);
                        printf("___%c_%s = 0\n", f->type, f->name);
                  } else {
                        printf("\t.global\t___%c_%s__btset_0x%s\n", f->type, f->name, f->initvalstr);
                        printf("___%c_%s__btset_0x%s = 0x%08x\n", f->type, f->name, f->initvalstr, f->initval);
                  }
            }
      }
      printf("\n\n");
      exit(0);
}

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