btfixupprep.c
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上传日期:2013-02-24
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文件大小:11k
- /* $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 objdumpn%sn", 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 symbolsn", 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 sectionsn", 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 __ksymtabn", buffer + shift, sect);
- else
- fprintf(stderr, "Wrong use of '%s' in '%s' section. It can be only used in .text, .fixup and .text.initn", 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 settingn%sn", 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 0xn%sn", 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%sn", 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 callsn%sn", 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_32n%sn", 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_LO10n%sn", buffer);
- exit(1);
- }
- break;
- case 'b':
- if (initval) {
- fprintf(stderr, "Cannot use pre-initialized fixups for blackboxesn%sn", buffer);
- exit(1);
- }
- if (strncmp (buffer + mode+9, "HI22 ", 10)) {
- fprintf(stderr, "BTFIXUP_BLACKBOX results in relocation other than R_SPARC_HI22n%sn", buffer);
- exit(1);
- }
- break;
- case 's':
- if (initval + 0x1000 >= 0x2000) {
- fprintf(stderr, "Wrong initializer for SIMM13. Has to be from $fffff000 to $00000fffn%sn", buffer);
- exit(1);
- }
- if (strncmp (buffer + mode+9, "13 ", 10)) {
- fprintf(stderr, "BTFIXUP_SIMM13 results in relocation other than R_SPARC_13n%sn", buffer);
- exit(1);
- }
- break;
- case 'a':
- if (initval + 0x1000 >= 0x2000 && (initval & 0x3ff)) {
- fprintf(stderr, "Wrong initializer for HALF.n%sn", buffer);
- exit(1);
- }
- if (strncmp (buffer + mode+9, "13 ", 10)) {
- fprintf(stderr, "BTFIXUP_HALF results in relocation other than R_SPARC_13n%sn", buffer);
- exit(1);
- }
- break;
- case 'h':
- if (initval & 0x3ff) {
- fprintf(stderr, "Wrong initializer for SETHI. Cannot have set low 10 bitsn%sn", buffer);
- exit(1);
- }
- if (strncmp (buffer + mode+9, "HI22 ", 10)) {
- fprintf(stderr, "BTFIXUP_SETHI results in relocation other than R_SPARC_HI22n%sn", buffer);
- exit(1);
- }
- break;
- case 'i':
- if (initval) {
- fprintf(stderr, "Cannot use pre-initalized fixups for INTn%sn", 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_LO10n%sn", 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 initializern%sn",
- 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%sn",
- 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 inn%sn", 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 recordsn");
- 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.nn");
- printf("t.sectiont".data.init",#alloc,#writent.alignt4nn");
- printf("t.globalt___btfixup_startn___btfixup_start:nn");
- for (i = 0; i < last; i++) {
- f = array + i;
- printf("t.globalt___%cs_%sn", f->type, f->name);
- if (f->type == 'f')
- printf("___%cs_%s:nt.word 0x%08x,0,0,", f->type, f->name, f->type << 24);
- else
- printf("___%cs_%s:nt.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("%dnt.wordt", j * 2);
- else
- printf("0n");
- 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("nt.globalt___btfixup_endn___btfixup_end:n");
- printf("nn! Define undefined referencesnn");
- for (i = 0; i < last; i++) {
- f = array + i;
- if (f->type == 'f') {
- printf("t.globalt___f_%sn", f->name);
- printf("___f_%s:n", f->name);
- }
- }
- printf("tretlnt nopnn");
- for (i = 0; i < last; i++) {
- f = array + i;
- if (f->type != 'f') {
- if (!f->initval) {
- printf("t.globalt___%c_%sn", f->type, f->name);
- printf("___%c_%s = 0n", f->type, f->name);
- } else {
- printf("t.globalt___%c_%s__btset_0x%sn", f->type, f->name, f->initvalstr);
- printf("___%c_%s__btset_0x%s = 0x%08xn", f->type, f->name, f->initvalstr, f->initval);
- }
- }
- }
- printf("nn");
- exit(0);
- }