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/* $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, ".text.init")) {
fprintf(stderr, "Wrong use of '%s' BTFIXUPSET.\nBTFIXUPSET_CALL can be used only in __init sections\n", buffer+shift);
exit(1);
}
} else if (buffer[nbase+4] != '_')
continue;
if (strcmp (sect, ".text") && strcmp (sect, ".text.init") && strcmp (sect, ".fixup") && (strcmp (sect, "__ksymtab") || buffer[nbase+3] != 'f')) {
if (buffer[nbase+3] == 'f')
fprintf(stderr, "Wrong use of '%s' in '%s' section. It can be only used in .text, .text.init, .fixup and __ksymtab\n", buffer + shift, sect);
else
fprintf(stderr, "Wrong use of '%s' in '%s' section. It can be only used in .text, .fixup and .text.init\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, ".text.init"))
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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