int
a_out_mod_sizes(int fd, size_t *modsize, int *strtablen,
struct lmc_resrv *resrvp, struct stat *sp)
{
struct exec info_buf;
if (a_out_read_header(fd, &info_buf) < 0)
return -1;
/*
* Calculate the size of the module
*/
*modsize = info_buf.a_text + info_buf.a_data + info_buf.a_bss;
*strtablen = sp->st_size - N_STROFF(info_buf);
if (symtab) {
/*
* XXX TODO: grovel through symbol table looking for
* just the symbol table stuff from the new module,
* and skip the stuff from the kernel.
*/
resrvp->sym_size = info_buf.a_syms + *strtablen;
resrvp->sym_symsize = info_buf.a_syms;
} else
resrvp->sym_size = resrvp->sym_symsize = 0;
return (0);
}
int
ksyms_aout_parse()
{
struct exec eh;
uint32_t size;
if (lseek(ksyms, 0, SEEK_SET) == -1)
return -1;
if (read(ksyms, &eh, sizeof eh) != sizeof eh)
return -1;
if (N_BADMAG(eh))
return -1;
ksymoffs = (off_t)N_STROFF(eh);
if (lseek(ksyms, ksymoffs, SEEK_SET) == -1)
return -1;
if (read(ksyms, &size, sizeof size) != sizeof size)
return -1;
ksymoffs += sizeof size;
if (size <= sizeof size)
return -1;
ksymsize = (off_t)size - sizeof size;
return 0;
}
/* Set parameters about this a.out file that are machine-dependent.
This routine is called from some_aout_object_p just before it returns. */
static const bfd_target *
MY (callback) (bfd *abfd)
{
struct internal_exec *execp = exec_hdr (abfd);
/* Calculate the file positions of the parts of a newly read aout header */
obj_textsec (abfd)->size = N_TXTSIZE (*execp);
/* The virtual memory addresses of the sections */
obj_textsec (abfd)->vma = N_TXTADDR (*execp);
obj_datasec (abfd)->vma = N_DATADDR (*execp);
obj_bsssec (abfd)->vma = N_BSSADDR (*execp);
obj_textsec (abfd)->lma = obj_textsec (abfd)->vma;
obj_datasec (abfd)->lma = obj_datasec (abfd)->vma;
obj_bsssec (abfd)->lma = obj_bsssec (abfd)->vma;
/* The file offsets of the sections */
obj_textsec (abfd)->filepos = N_TXTOFF (*execp);
obj_datasec (abfd)->filepos = N_DATOFF (*execp);
/* The file offsets of the relocation info */
obj_textsec (abfd)->rel_filepos = N_TRELOFF (*execp);
obj_datasec (abfd)->rel_filepos = N_DRELOFF (*execp);
/* The file offsets of the string table and symbol table. */
obj_sym_filepos (abfd) = N_SYMOFF (*execp);
obj_str_filepos (abfd) = N_STROFF (*execp);
/* Determine the architecture and machine type of the object file. */
#ifdef SET_ARCH_MACH
SET_ARCH_MACH (abfd, *execp);
#else
bfd_default_set_arch_mach (abfd, DEFAULT_ARCH, 0);
#endif
if (obj_aout_subformat (abfd) == gnu_encap_format)
{
/* The file offsets of the relocation info */
obj_textsec (abfd)->rel_filepos = N_GNU_TRELOFF (*execp);
obj_datasec (abfd)->rel_filepos = N_GNU_DRELOFF (*execp);
/* The file offsets of the string table and symbol table. */
obj_sym_filepos (abfd) = N_GNU_SYMOFF (*execp);
obj_str_filepos (abfd) = (obj_sym_filepos (abfd) + execp->a_syms);
abfd->flags |= HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS;
bfd_get_symcount (abfd) = execp->a_syms / 12;
obj_symbol_entry_size (abfd) = 12;
obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
}
return abfd->xvec;
}
int read_nlist(char *systemfile)
{
int fd;
struct exec hdr;
unsigned symsize, size;
if ((fd = open(systemfile, O_RDONLY)) < 0) {
perror(systemfile);
exit(1);
}
if (read(fd, (char *) &hdr, sizeof(hdr)) != sizeof(hdr)) {
perror(systemfile);
exit(1);
}
if (N_BADMAG(hdr)) {
fprintf(stderr, "%s: bad magic number\n", systemfile);
exit(1);
}
if (N_STROFF(hdr) == 0) {
fprintf(stderr, "%s has no symbols\n", systemfile);
exit(1);
}
lseek(fd, N_STROFF(hdr), SEEK_SET);
read(fd, (char *) &stringsize, sizeof(stringsize));
symsize = N_STROFF(hdr) - N_SYMOFF(hdr);
size = symsize + stringsize;
namelist = (struct nlist *) xmalloc(size);
lseek(fd, N_SYMOFF(hdr), SEEK_SET);
if (read(fd, (char *) namelist, size) != size) {
perror(systemfile);
exit(1);
}
close(fd);
strings = ((char *) namelist) + symsize;
nsym = symsize / sizeof(struct nlist);
if (Debug > 1)
fprintf(stderr, "read %d symbols from %s\n", nsym, systemfile);
return(0);
}
char *
read_stringtable(FILE *fin, struct exec *exhdr, int *strtbl_sz)
{
unsigned long length;
char *p = NULL;
assert(NULL != fin);
if (NULL == exhdr) {
fprintf(stderr, "Trying to read string table, but got no a.out header\n");
return NULL;
}
if (fseek(fin, N_STROFF(*exhdr), SEEK_SET) < 0) {
fprintf(stderr, "Problem seeking to string table: %s\n",
strerror(errno));
return NULL;
}
if (fread(&length, sizeof(length), 1, fin) != 1) {
fprintf(stderr, "Problem reading length of string table: %s\n",
strerror(errno));
return NULL;
}
if (length >= 4) {
p = read_extent(fin, length, N_STROFF(*exhdr), __LINE__);
*strtbl_sz = length;
printf("\nstring table size %d\n", *strtbl_sz);
} else {
fprintf(stderr, "Problem, length of string table read as %d,"
" can't be right\n, ", length);
*strtbl_sz = 0;
}
return p;
}
static void demangleAout(const HDR *x, long nsyms)
{
newSym=xfopen(newSym_n, "w+");
xsetbuf(newSym, newSymb);
newSng=xfopen(newSng_n, "w+");
xsetbuf(newSng, newSngb);
newSngLoc = 4;
//cerr << "created temps!" << endl;
//sleep(5);
readStringTable(N_STROFF(*x));
buildNewTables(x, nsyms);
if (overwriteAout)
overwriteOldTables(x);
delete stringTable;
fclose(newSym);
fclose(newSng);
unlink(newSym_n);
unlink(newSng_n);
}
int hide_aout(int inf, const char *filename)
{
struct stat infstat;
struct relocation_info *relp;
struct nlist *symp;
int rc;
/*
* do some error checking.
*/
if(fstat(inf, &infstat) == -1) {
perror(filename);
return 1;
}
/*
* Read the entire file into memory. XXX - Really, we only need to
* read the header and from TRELOFF to the end of the file.
*/
if((aoutdata = (char *) malloc(infstat.st_size)) == NULL) {
fprintf(stderr, "%s: too big to read into memory\n", filename);
return 1;
}
if((rc = read(inf, aoutdata, infstat.st_size)) < infstat.st_size) {
fprintf(stderr, "%s: read error: %s\n", filename,
rc == -1? strerror(errno) : "short read");
return 1;
}
/*
* Calculate offsets and sizes from the header.
*/
hdrp = (struct exec *) aoutdata;
#ifdef __FreeBSD__
textrel = (struct relocation_info *) (aoutdata + N_RELOFF(*hdrp));
datarel = (struct relocation_info *) (aoutdata + N_RELOFF(*hdrp) +
hdrp->a_trsize);
#else
textrel = (struct relocation_info *) (aoutdata + N_TRELOFF(*hdrp));
datarel = (struct relocation_info *) (aoutdata + N_DRELOFF(*hdrp));
#endif
symbase = (struct nlist *) (aoutdata + N_SYMOFF(*hdrp));
strbase = (char *) (aoutdata + N_STROFF(*hdrp));
ntextrel = hdrp->a_trsize / sizeof(struct relocation_info);
ndatarel = hdrp->a_drsize / sizeof(struct relocation_info);
nsyms = hdrp->a_syms / sizeof(struct nlist);
/*
* Zap the type field of all globally-defined symbols. The linker will
* subsequently ignore these entries. Don't zap any symbols in the
* keep list.
*/
for(symp = symbase; symp < symbase + nsyms; symp++) {
if(!IS_GLOBAL_DEFINED(symp)) /* keep undefined syms */
continue;
/* keep (C) symbols which are on the keep list */
if(SYMSTR(symp)[0] == '_' && in_keep_list(SYMSTR(symp) + 1))
continue;
symp->n_type = 0;
}
/*
* Check whether the relocation entries reference any symbols that we
* just zapped. I don't know whether ld can handle this case, but I
* haven't encountered it yet. These checks are here so that the program
* doesn't fail silently should such symbols be encountered.
*/
for(relp = textrel; relp < textrel + ntextrel; relp++)
check_reloc(filename, relp);
for(relp = datarel; relp < datarel + ndatarel; relp++)
check_reloc(filename, relp);
/*
* Write the .o file back out to disk. XXX - Really, we only need to
* write the symbol table entries back out.
*/
lseek(inf, 0, SEEK_SET);
if((rc = write(inf, aoutdata, infstat.st_size)) < infstat.st_size) {
fprintf(stderr, "%s: write error: %s\n", filename,
rc == -1? strerror(errno) : "short write");
return 1;
}
return 0;
}
static const bfd_target *
aout_adobe_callback (bfd *abfd)
{
struct internal_exec *execp = exec_hdr (abfd);
asection *sect;
struct external_segdesc ext[1];
char *section_name;
char try_again[30]; /* Name and number. */
char *newname;
int trynum;
flagword flags;
/* Architecture and machine type -- unknown in this format. */
bfd_set_arch_mach (abfd, bfd_arch_unknown, 0L);
/* The positions of the string table and symbol table. */
obj_str_filepos (abfd) = N_STROFF (*execp);
obj_sym_filepos (abfd) = N_SYMOFF (*execp);
/* Suck up the section information from the file, one section at a time. */
for (;;)
{
bfd_size_type amt = sizeof (*ext);
if (bfd_bread ( ext, amt, abfd) != amt)
{
if (bfd_get_error () != bfd_error_system_call)
bfd_set_error (bfd_error_wrong_format);
return NULL;
}
switch (ext->e_type[0])
{
case N_TEXT:
section_name = ".text";
flags = SEC_CODE | SEC_LOAD | SEC_ALLOC | SEC_HAS_CONTENTS;
break;
case N_DATA:
section_name = ".data";
flags = SEC_DATA | SEC_LOAD | SEC_ALLOC | SEC_HAS_CONTENTS;
break;
case N_BSS:
section_name = ".bss";
flags = SEC_DATA | SEC_HAS_CONTENTS;
break;
case 0:
goto no_more_sections;
default:
(*_bfd_error_handler)
(_("%B: Unknown section type in a.out.adobe file: %x\n"),
abfd, ext->e_type[0]);
goto no_more_sections;
}
/* First one is called ".text" or whatever; subsequent ones are
".text1", ".text2", ... */
bfd_set_error (bfd_error_no_error);
sect = bfd_make_section_with_flags (abfd, section_name, flags);
trynum = 0;
while (!sect)
{
if (bfd_get_error () != bfd_error_no_error)
/* Some other error -- slide into the sunset. */
return NULL;
sprintf (try_again, "%s%d", section_name, ++trynum);
sect = bfd_make_section_with_flags (abfd, try_again, flags);
}
/* Fix the name, if it is a sprintf'd name. */
if (sect->name == try_again)
{
amt = strlen (sect->name);
newname = bfd_zalloc (abfd, amt);
if (newname == NULL)
return NULL;
strcpy (newname, sect->name);
sect->name = newname;
}
/* Assumed big-endian. */
sect->size = ((ext->e_size[0] << 8)
| ext->e_size[1] << 8
| ext->e_size[2]);
sect->vma = H_GET_32 (abfd, ext->e_virtbase);
sect->filepos = H_GET_32 (abfd, ext->e_filebase);
/* FIXME XXX alignment? */
/* Set relocation information for first section of each type. */
if (trynum == 0)
switch (ext->e_type[0])
{
case N_TEXT:
sect->rel_filepos = N_TRELOFF (*execp);
sect->reloc_count = execp->a_trsize;
break;
case N_DATA:
sect->rel_filepos = N_DRELOFF (*execp);
sect->reloc_count = execp->a_drsize;
break;
default:
break;
}
}
no_more_sections:
adata (abfd).reloc_entry_size = sizeof (struct reloc_std_external);
adata (abfd).symbol_entry_size = sizeof (struct external_nlist);
adata (abfd).page_size = 1; /* Not applicable. */
adata (abfd).segment_size = 1; /* Not applicable. */
adata (abfd).exec_bytes_size = EXEC_BYTES_SIZE;
return abfd->xvec;
}
/*
* read_exec
* Read the exec structure; ignore any files that don't look
* exactly right. Return MID.
* return -1 for files that don't look right.
* XXX it's hard to be sure when to ignore files, and when to error
* out.
*/
int
read_exec(FILE *rfp, FILE *wfp, long *symcnt, long *tsymlen)
{
union {
struct exec exec;
Elf32_Ehdr elf32;
Elf64_Ehdr elf64;
} eh;
struct nlist nl;
off_t r_off, w_off;
char *strtab = NULL;
long strsize, nsyms;
int i;
/* Get current offsets for original and tmp files. */
r_off = ftello(rfp);
w_off = ftello(wfp);
/* Read in exec structure. */
if (fread(&eh, sizeof(eh), 1, rfp) != 1)
err(1, "fread: %s", archive);
if (!elf32_chk_header(&eh.elf32)) {
Elf32_Sym sbuf;
char *shstr;
Elf32_Shdr *shdr;
size_t stabsize;
elf32_fix_header(&eh.elf32);
if (eh.elf32.e_ehsize < sizeof eh.elf32) {
warnx("%s: ELF header is too short", archive);
goto bad;
}
if (!(shdr = elf32_load_shdrs(archive, rfp, r_off, &eh.elf32)))
goto bad;
elf32_fix_shdrs(&eh.elf32, shdr);
if (!(shstr = elf32_shstrload(archive, rfp, r_off, &eh.elf32,
shdr))) {
free(shdr);
goto bad;
}
if (!(strtab = elf32_strload(archive, rfp, r_off, &eh.elf32,
shdr, shstr, ELF_STRTAB, &stabsize))) {
free(shstr);
free(shdr);
goto bad;
}
/* find the symtab section */
for (i = 0; i < eh.elf32.e_shnum; i++)
if (!strcmp(shstr + shdr[i].sh_name, ELF_SYMTAB)) {
nsyms = shdr[i].sh_size / sizeof(Elf32_Sym);
break;
}
if (i == eh.elf32.e_shnum) {
free(shstr);
free(shdr);
goto bad;
}
if (fseeko(rfp, r_off + shdr[i].sh_offset, SEEK_SET))
err(1, "fseeko: %s", archive);
for (i = 0; i < nsyms; i++) {
if (fread(&sbuf, sizeof(sbuf), 1, rfp) != 1)
err(1, "fread: %s", archive);
elf32_fix_sym(&eh.elf32, &sbuf);
if (!sbuf.st_name || sbuf.st_name > stabsize)
continue;
if (elf32_2nlist(&sbuf, &eh.elf32, shdr, shstr, &nl))
continue;
addsym(&nl, strtab, r_off - r_fuzz -
sizeof(struct ar_hdr), symcnt, tsymlen, archive);
}
free(strtab);
free(shstr);
free(shdr);
(void)fseeko(rfp, r_off, SEEK_SET);
return MID_ELFFL | eh.elf32.e_machine;
} else if (!elf64_chk_header(&eh.elf64)) {
Elf64_Sym sbuf;
char *shstr;
Elf64_Shdr *shdr;
size_t stabsize;
elf64_fix_header(&eh.elf64);
if (eh.elf64.e_ehsize < sizeof eh.elf64) {
warnx("%s: ELF header is too short", archive);
goto bad;
}
if (!(shdr = elf64_load_shdrs(archive, rfp, r_off, &eh.elf64)))
goto bad;
elf64_fix_shdrs(&eh.elf64, shdr);
if (!(shstr = elf64_shstrload(archive, rfp, r_off, &eh.elf64,
shdr))) {
free(shdr);
goto bad;
}
if (!(strtab = elf64_strload(archive, rfp, r_off, &eh.elf64,
shdr, shstr, ELF_STRTAB, &stabsize))) {
free(shstr);
free(shdr);
goto bad;
}
/* find the symtab section */
for (i = 0; i < eh.elf64.e_shnum; i++)
if (!strcmp(shstr + shdr[i].sh_name, ELF_SYMTAB)) {
nsyms = shdr[i].sh_size / sizeof(Elf64_Sym);
break;
}
if (i == eh.elf64.e_shnum) {
free(shstr);
free(shdr);
goto bad;
}
if (fseeko(rfp, r_off + shdr[i].sh_offset, SEEK_SET))
err(1, "fseeko: %s", archive);
for (i = 0; i < nsyms; i++) {
if (fread(&sbuf, sizeof(sbuf), 1, rfp) != 1)
err(1, "fread: %s", archive);
elf64_fix_sym(&eh.elf64, &sbuf);
if (!sbuf.st_name || sbuf.st_name > stabsize)
continue;
if (elf64_2nlist(&sbuf, &eh.elf64, shdr, shstr, &nl))
continue;
addsym(&nl, strtab, r_off - r_fuzz -
sizeof(struct ar_hdr), symcnt, tsymlen, archive);
}
free(strtab);
free(shstr);
free(shdr);
(void)fseeko(rfp, r_off, SEEK_SET);
return MID_ELFFL | eh.elf64.e_machine;
} else if (BAD_OBJECT(eh.exec) || eh.exec.a_syms == 0)
goto bad;
fix_header_order(&eh.exec);
/* Seek to string table. */
if (fseeko(rfp, N_STROFF(eh.exec) + r_off, SEEK_SET) == -1) {
if (errno == EINVAL)
goto bad;
else
err(1, "lseek: %s", archive);
}
/* Read in size of the string table. */
if (fread((char *)&strsize, sizeof(strsize), 1, rfp) != 1)
err(1, "fread: %s", archive);
strsize = fix_32_order(strsize, N_GETMID(eh.exec));
/* Read in the string table. */
strsize -= sizeof(strsize);
strtab = malloc(strsize);
if (!strtab)
err(1, "malloc: %s", archive);
if (fread(strtab, strsize, 1, rfp) != 1)
err(1, "fread: %s", archive);
/* Seek to symbol table. */
if (fseek(rfp, N_SYMOFF(eh.exec) + r_off, SEEK_SET) == (off_t)-1)
err(1, "fseeko: %s", archive);
/* For each symbol read the nlist entry and save it as necessary. */
nsyms = eh.exec.a_syms / sizeof(struct nlist);
while (nsyms--) {
if (!fread((char *)&nl, sizeof(struct nlist), 1, rfp)) {
if (feof(rfp))
badfmt();
err(1, "fread: %s", archive);
}
fix_nlist_order(&nl, N_GETMID(eh.exec));
addsym(&nl, strtab - sizeof(long), r_off - r_fuzz -
sizeof(struct ar_hdr), symcnt, tsymlen, archive);
}
bad:
free(strtab);
(void)fseeko(rfp, r_off, SEEK_SET);
return N_GETMID(eh.exec);
}
static
#endif
void
dump_file(const char *fname)
{
int fd;
struct stat sb;
caddr_t objbase;
if (stat(fname, &sb) == -1) {
warnx("cannot stat \"%s\"", fname);
++error_count;
return;
}
if ((sb.st_mode & S_IFMT) != S_IFREG) {
warnx("\"%s\" is not a regular file", fname);
++error_count;
return;
}
if ((fd = open(fname, O_RDONLY, 0)) == -1) {
warnx("cannot open \"%s\"", fname);
++error_count;
return;
}
objbase = mmap(0, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (objbase == (caddr_t) -1) {
warnx("cannot mmap \"%s\"", fname);
++error_count;
close(fd);
return;
}
close(fd);
file_base = (const char *) objbase; /* Makes address arithmetic easier */
if (IS_ELF(*(const Elf32_Ehdr*) align_struct(file_base))) {
warnx("%s: this is an ELF program; use objdump to examine", fname);
++error_count;
munmap(objbase, sb.st_size);
return;
}
ex = (const struct exec *) align_struct(file_base);
printf("%s: a_midmag = 0x%lx\n", fname, (long)ex->a_midmag);
printf(" magic = 0x%lx = 0%lo, netmagic = 0x%lx = 0%lo\n",
(long)N_GETMAGIC(*ex), (long)N_GETMAGIC(*ex),
(long)N_GETMAGIC_NET(*ex), (long)N_GETMAGIC_NET(*ex));
if (N_BADMAG(*ex)) {
warnx("%s: bad magic number", fname);
++error_count;
munmap(objbase, sb.st_size);
return;
}
printf(" a_text = 0x%lx\n", (long)ex->a_text);
printf(" a_data = 0x%lx\n", (long)ex->a_data);
printf(" a_bss = 0x%lx\n", (long)ex->a_bss);
printf(" a_syms = 0x%lx\n", (long)ex->a_syms);
printf(" a_entry = 0x%lx\n", (long)ex->a_entry);
printf(" a_trsize = 0x%lx\n", (long)ex->a_trsize);
printf(" a_drsize = 0x%lx\n", (long)ex->a_drsize);
text_base = file_base + N_TXTOFF(*ex);
data_base = file_base + N_DATOFF(*ex);
rel_base = (const struct relocation_info *)
align_struct(file_base + N_RELOFF(*ex));
sym_base = (const struct nlist *) align_struct(file_base + N_SYMOFF(*ex));
str_base = file_base + N_STROFF(*ex);
rel_count = (ex->a_trsize + ex->a_drsize) / sizeof rel_base[0];
assert(rel_count * sizeof rel_base[0] == ex->a_trsize + ex->a_drsize);
sym_count = ex->a_syms / sizeof sym_base[0];
assert(sym_count * sizeof sym_base[0] == ex->a_syms);
if (sym_count != 0) {
sym_used = (unsigned char *) calloc(sym_count, sizeof(unsigned char));
assert(sym_used != NULL);
}
printf(" Entry = 0x%lx\n", (long)ex->a_entry);
printf(" Text offset = %x, address = %lx\n", N_TXTOFF(*ex),
(long)N_TXTADDR(*ex));
printf(" Data offset = %lx, address = %lx\n", (long)N_DATOFF(*ex),
(long)N_DATADDR(*ex));
/*
* In an executable program file, everything is relocated relative to
* the assumed run-time load address, i.e., N_TXTADDR(*ex), i.e., 0x1000.
*
* In a shared library file, everything is relocated relative to the
* start of the file, i.e., N_TXTOFF(*ex), i.e., 0.
*
* The way to tell the difference is by looking at ex->a_entry. If it
* is >= 0x1000, then we have an executable program. Otherwise, we
* have a shared library.
*
* When a program is executed, the entire file is mapped into memory,
* including the a.out header and so forth. But it is not mapped at
* address 0; rather it is mapped at address 0x1000. The first page
* of the user's address space is left unmapped in order to catch null
* pointer dereferences.
*
* In this program, when we map in an executable program, we have to
* simulate the empty page by decrementing our assumed base address by
* a pagesize.
*/
text_addr = text_base;
data_addr = data_base;
origin = 0;
if (ex->a_entry >= PAGE_SIZE) { /* Executable, not a shared library */
/*
* The fields in the object have already been relocated on the
* assumption that the object will be loaded at N_TXTADDR(*ex).
* We have to compensate for that.
*/
text_addr -= PAGE_SIZE;
data_addr -= PAGE_SIZE;
origin = PAGE_SIZE;
printf(" Program, origin = %lx\n", origin);
} else if (N_GETFLAG(*ex) & EX_DYNAMIC)
printf(" Shared library, origin = %lx\n", origin);
else
printf(" Object file, origin = %lx\n", origin);
if (N_GETFLAG(*ex) & EX_DYNAMIC) {
dyn = (const struct _dynamic *) align_struct(data_base);
printf(" Dynamic version = %d\n", dyn->d_version);
sdt = (const struct section_dispatch_table *)
align_struct(text_addr + (unsigned long) dyn->d_un.d_sdt);
rtrel_base = (const struct relocation_info *)
align_struct(text_addr + sdt->sdt_rel);
rtrel_count = (sdt->sdt_hash - sdt->sdt_rel) / sizeof rtrel_base[0];
assert(rtrel_count * sizeof rtrel_base[0] ==
(size_t)(sdt->sdt_hash - sdt->sdt_rel));
rtsym_base = (const struct nzlist *)
align_struct(text_addr + sdt->sdt_nzlist);
rtsym_count = (sdt->sdt_strings - sdt->sdt_nzlist) /
sizeof rtsym_base[0];
assert(rtsym_count * sizeof rtsym_base[0] ==
(size_t)(sdt->sdt_strings - sdt->sdt_nzlist));
if (rtsym_count != 0) {
rtsym_used = (unsigned char *) calloc(rtsym_count,
sizeof(unsigned char));
assert(rtsym_used != NULL);
}
rtstr_base = text_addr + sdt->sdt_strings;
}
dump_segs();
dump_sods();
dump_rels("Relocations", rel_base, rel_count, sym_name, sym_used);
dump_syms();
dump_rels("Run-time relocations", rtrel_base, rtrel_count, rtsym_name,
rtsym_used);
dump_rtsyms();
if (rtsym_used != NULL) {
free(rtsym_used);
rtsym_used = NULL;
}
if (sym_used != NULL) {
free(sym_used);
sym_used = NULL;
}
munmap(objbase, sb.st_size);
}
void
hide_syms(char *filename)
{
int inf, outf, rc;
struct stat infstat;
struct relocation_info *relp;
struct nlist *symp;
char *buf;
u_char zero = 0;
/*
* Open the file and do some error checking.
*/
if ((inf = open(filename, O_RDWR)) == -1) {
perror(filename);
return;
}
if (fstat(inf, &infstat) == -1) {
perror(filename);
close(inf);
return;
}
if (infstat.st_size < sizeof(struct exec)) {
fprintf(stderr, "%s: short file\n", filename);
close(inf);
return;
}
if ((buf = mmap(NULL, infstat.st_size, PROT_READ | PROT_WRITE,
MAP_FILE | MAP_SHARED, inf, 0)) == MAP_FAILED) {
fprintf(stderr, "%s: cannot map\n", filename);
close(inf);
return;
}
#ifdef _NLIST_DO_ELF
if (buf[0] == 0x7f && (buf[1] == 'E' || buf[1] == 'O') &&
buf[2] == 'L' && buf[3] == 'F') {
elf_hide(inf, buf);
return;
}
#endif /* _NLIST_DO_ELF */
#ifdef _NLIST_DO_ECOFF
if (!ECOFF_BADMAG((struct ecoff_exechdr *) buf)) {
ecoff_hide(inf, buf);
return;
}
#endif /* _NLIST_DO_ECOFF */
#ifdef DO_AOUT
aoutdata = buf;
/*
* Check the header and calculate offsets and sizes from it.
*/
hdrp = (struct exec *) aoutdata;
if (N_BADMAG(*hdrp)) {
fprintf(stderr, "%s: bad magic: not an a.out, ecoff or elf file\n",
filename);
close(inf);
return;
}
textrel = (struct relocation_info *) (aoutdata + N_TRELOFF(*hdrp));
datarel = (struct relocation_info *) (aoutdata + N_DRELOFF(*hdrp));
symbase = (struct nlist *) (aoutdata + N_SYMOFF(*hdrp));
strbase = (char *) (aoutdata + N_STROFF(*hdrp));
ntextrel = hdrp->a_trsize / sizeof(struct relocation_info);
ndatarel = hdrp->a_drsize / sizeof(struct relocation_info);
nsyms = hdrp->a_syms / sizeof(struct nlist);
/*
* Zap the type field of all globally-defined symbols. The linker will
* subsequently ignore these entries. Don't zap any symbols in the
* keep list.
*/
for (symp = symbase; symp < symbase + nsyms; symp++)
if (IS_GLOBAL_DEFINED(symp) && !in_keep_list(SYMSTR(symp))) {
/*
* XXX Our VM system has some problems, so
* avoid the VM system....
*/
lseek(inf, (off_t) ((void *) &symp->n_type -
(void *) buf), SEEK_SET);
write(inf, &zero, sizeof zero);
symp->n_type = 0;
}
/*
* Check whether the relocation entries reference any symbols that we
* just zapped. I don't know whether ld can handle this case, but I
* haven't encountered it yet. These checks are here so that the program
* doesn't fail silently should such symbols be encountered.
*/
for (relp = textrel; relp < textrel + ntextrel; relp++)
check_reloc(filename, relp);
for (relp = datarel; relp < datarel + ndatarel; relp++)
check_reloc(filename, relp);
msync(buf, infstat.st_size, MS_SYNC);
munmap(buf, infstat.st_size);
close(inf);
#endif /* DO_AOUT */
}
/*
* rexec
* Read the exec structure; ignore any files that don't look
* exactly right. Return MID.
* return -1 for files that don't look right.
* XXX it's hard to be sure when to ignore files, and when to error
* out.
*/
static int
rexec(int rfd, int wfd)
{
RLIB *rp;
long nsyms;
int nr, symlen;
char *strtab = 0;
char *sym;
struct exec ebuf;
struct nlist nl;
off_t r_off, w_off;
long strsize;
int result = -1;
/* Get current offsets for original and tmp files. */
r_off = lseek(rfd, (off_t)0, SEEK_CUR);
w_off = lseek(wfd, (off_t)0, SEEK_CUR);
/* Read in exec structure. */
nr = read(rfd, (char *)&ebuf, sizeof(struct exec));
if (nr != sizeof(struct exec))
goto bad;
/* Check magic number and symbol count. */
if (BAD_OBJECT(ebuf) || ebuf.a_syms == 0)
goto bad;
fix_header_order(&ebuf);
/* Seek to string table. */
if (lseek(rfd, N_STROFF(ebuf) + r_off, SEEK_SET) == (off_t)-1) {
if (errno == EINVAL)
goto bad;
else
error(archive);
}
/* Read in size of the string table. */
nr = read(rfd, (char *)&strsize, sizeof(strsize));
if (nr != sizeof(strsize))
goto bad;
strsize = fix_32_order(strsize, N_GETMID(ebuf));
/* Read in the string table. */
strsize -= sizeof(strsize);
strtab = (char *)emalloc(strsize);
nr = read(rfd, strtab, strsize);
if (nr != strsize)
goto bad;
/* Seek to symbol table. */
if (fseek(fp, N_SYMOFF(ebuf) + r_off, SEEK_SET) == (off_t)-1)
goto bad;
result = N_GETMID(ebuf);
/* For each symbol read the nlist entry and save it as necessary. */
nsyms = ebuf.a_syms / sizeof(struct nlist);
while (nsyms--) {
if (!fread((char *)&nl, sizeof(struct nlist), 1, fp)) {
if (feof(fp))
badfmt();
error(archive);
}
fix_nlist_order(&nl, N_GETMID(ebuf));
/* Ignore if no name or local. */
if (!nl.n_un.n_strx || !(nl.n_type & N_EXT))
continue;
/*
* If the symbol is an undefined external and the n_value
* field is non-zero, keep it.
*/
if ((nl.n_type & N_TYPE) == N_UNDF && !nl.n_value)
continue;
/* First four bytes are the table size. */
sym = strtab + nl.n_un.n_strx - sizeof(long);
symlen = strlen(sym) + 1;
rp = (RLIB *)emalloc(sizeof(RLIB));
rp->sym = (char *)emalloc(symlen);
bcopy(sym, rp->sym, symlen);
rp->symlen = symlen;
rp->pos = w_off;
/* Build in forward order for "ar -m" command. */
*pnext = rp;
pnext = &rp->next;
++symcnt;
tsymlen += symlen;
}
bad: if (nr < 0)
error(archive);
free(strtab);
(void)lseek(rfd, (off_t)r_off, SEEK_SET);
return result;
}
int
main(int argc, char **argv)
{
struct nlist *p, *symp;
FILE *f, *xfile;
int i;
char *start, *t, *xfilename;
int ch, n, o;
xfilename = NULL;
while ((ch = getopt(argc, argv, "cmtx:")) != -1)
switch(ch) {
case 'c':
clean = 1;
break;
case 'm':
missing = 1;
break;
case 't':
small = 1;
break;
case 'x':
if (xfilename != NULL)
usage();
xfilename = optarg;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 2)
usage();
if ((f = fopen(argv[0], "r")) == NULL)
err(ERREXIT, "%s", argv[0]);
for (p = order; fgets(asym, sizeof(asym), f) != NULL;) {
for (t = asym; isspace(*t); ++t);
if (!*(start = t))
continue;
while (*++t);
if (*--t == '\n')
*t = '\0';
p->n_un.n_name = strdup(start);
++p;
if (++nsym >= sizeof order / sizeof order[0])
break;
}
(void)fclose(f);
if (xfilename != NULL) {
if ((xfile = fopen(xfilename, "r")) == NULL)
err(ERREXIT, "%s", xfilename);
for (; fgets(asym, sizeof(asym), xfile) != NULL;) {
for (t = asym; isspace(*t); ++t);
if (!*(start = t))
continue;
while (*++t);
if (*--t == '\n')
*t = '\0';
exclude[nexclude] = strdup(start);
if (++nexclude >= sizeof exclude / sizeof exclude[0])
break;
}
(void)fclose(xfile);
}
kfile = argv[1];
if ((f = fopen(kfile, "r")) == NULL)
err(ERREXIT, "%s", kfile);
if ((o = open(kfile, O_WRONLY)) < 0)
err(ERREXIT, "%s", kfile);
/* read exec header */
if ((fread(&exec, sizeof(exec), 1, f)) != 1)
badfmt("no exec header");
if (N_BADMAG(exec))
badfmt("bad magic number");
if (exec.a_syms == 0)
badfmt("stripped");
(void)fstat(fileno(f), &stb);
if (stb.st_size < N_STROFF(exec) + sizeof(off_t))
badfmt("no string table");
/* seek to and read the symbol table */
sa = N_SYMOFF(exec);
(void)fseek(f, sa, SEEK_SET);
n = exec.a_syms;
if (!(symtab = (struct nlist *)malloc(n)))
err(ERREXIT, NULL);
if (fread((void *)symtab, 1, n, f) != n)
badfmt("corrupted symbol table");
/* read string table size and string table */
if (fread((void *)&strtabsize, sizeof(int), 1, f) != 1 ||
strtabsize <= 0)
badfmt("corrupted string table");
strings = malloc(strtabsize);
if (strings == NULL)
err(ERREXIT, NULL);
/*
* Subtract four from strtabsize since strtabsize includes itself,
* and we've already read it.
*/
if (fread(strings, 1, strtabsize - sizeof(int), f) !=
strtabsize - sizeof(int))
badfmt("corrupted string table");
i = n / sizeof(struct nlist);
if (!clean) {
newtab = (struct nlist *)malloc(n);
if (newtab == NULL)
err(ERREXIT, NULL);
memset(newtab, 0, n);
reorder(symtab, newtab, i);
free((void *)symtab);
symtab = newtab;
} else {
symkept = i;
}
newstrings = malloc(strtabsize);
if (newstrings == NULL)
err(ERREXIT, NULL);
t = newstrings;
for (symp = symtab; --i >= 0; symp++) {
if (symp->n_un.n_strx == 0)
continue;
if (inlist(symp) < 0) {
if (small)
continue;
if (clean && !savesymb(symp))
symp->n_type &= ~N_EXT;
} else if (clean)
symfound++;
symp->n_un.n_strx -= sizeof(int);
(void)strcpy(t, &strings[symp->n_un.n_strx]);
symp->n_un.n_strx = (t - newstrings) + sizeof(int);
t += strlen(t) + 1;
}
/* update shrunk sizes */
strtabsize = t - newstrings + sizeof(int);
n = symkept * sizeof(struct nlist);
/* fix exec sym size */
(void)lseek(o, (off_t)0, SEEK_SET);
exec.a_syms = n;
if (write(o, (void *)&exec, sizeof(exec)) != sizeof(exec))
err(ERREXIT, "%s", kfile);
(void)lseek(o, sa, SEEK_SET);
if (write(o, (void *)symtab, n) != n)
err(ERREXIT, "%s", kfile);
if (write(o, (void *)&strtabsize, sizeof(int)) != sizeof(int))
err(ERREXIT, "%s", kfile);
if (write(o, newstrings, strtabsize - sizeof(int)) !=
strtabsize - sizeof(int))
err(ERREXIT, "%s", kfile);
ftruncate(o, lseek(o, (off_t)0, SEEK_CUR));
if ((i = nsym - symfound) > 0) {
(void)printf("symorder: %d symbol%s not found:\n",
i, i == 1 ? "" : "s");
for (i = 0; i < nsym; i++)
if (order[i].n_value == 0)
printf("%s\n", order[i].n_un.n_name);
if (!missing)
exit(NOTFOUNDEXIT);
}
exit(OKEXIT);
}
void
run_header(struct exec *exhdr, int extended_info)
{
char *id = NULL;
assert(NULL != exhdr);
/* print raw values */
printf(
"\ta_midmag 0x%08x (mid %d, magic 0%o, flag 0x%x)\n"
"\ta_text 0x%08x\n"
"\ta_data 0x%08x\n"
"\ta_bss 0x%08x\n"
"\ta_syms 0x%08x\n"
"\ta_entry 0x%08x\n"
"\ta_trsize 0x%08x\n"
"\ta_drsize 0x%08x\n",
exhdr->a_midmag,
N_GETMID(*exhdr), N_GETMAGIC(*exhdr), N_GETFLAG(*exhdr),
exhdr->a_text,
exhdr->a_data,
exhdr->a_bss,
exhdr->a_syms,
exhdr->a_entry,
exhdr->a_trsize,
exhdr->a_drsize
);
printf(
"magic number %04o: %s\n", N_GETMAGIC(*exhdr),
N_GETMAGIC(*exhdr) == OMAGIC ? "old impure format" :
N_GETMAGIC(*exhdr) == NMAGIC ? "read-only text" :
N_GETMAGIC(*exhdr) == ZMAGIC ? "demand load format" :
N_GETMAGIC(*exhdr) == QMAGIC ? "deprecated format" :
"totally funky"
);
switch (N_GETMID(*exhdr)) {
case MID_ZERO: id = "unknown - implementation dependent"; break;
case MID_SUN010: id = "sun 68010/68020 binary"; break;
case MID_SUN020: id = "sun 68020-only binary"; break;
case MID_PC386: id = "386 PC binary. (so quoth BFD)"; break;
case MID_HP200: id = "hp200 (68010) BSD binary"; break;
case MID_I386: id = "i386 BSD binary"; break;
case MID_M68K: id = "m68k BSD binary with 8K page sizes"; break;
case MID_M68K4K: id = "m68k BSD binary with 4K page sizes"; break;
case MID_NS32532: id = "ns32532"; break;
case MID_SPARC: id = "sparc"; break;
case MID_PMAX: id = "pmax"; break;
case MID_VAX: id = "vax"; break;
case MID_ALPHA: id = "Alpha BSD binary"; break;
case MID_MIPS: id = "big-endian MIPS"; break;
case MID_ARM6: id = "ARM6"; break;
case MID_HP300: id = "hp300 (68020+68881) BSD binary"; break;
case MID_HPUX: id = "hp200/300 HP-UX binary"; break;
case MID_HPUX800: id = "hp800 HP-UX binary"; break;
default:
id = "don't know"; break;
}
printf("type %d, %s\n", N_GETMID(*exhdr), id);
/* this left shift seems a bit bogus */
switch((N_GETFLAG(*exhdr) & EX_DPMASK)>>4) {
case 0:
id = "traditional executable or object file"; break;
case 1:
id = "object file contains PIC code"; break;
case 2:
id = "dynamic executable"; break;
case 3:
id = "position independent executable image"; break;
default:
id = NULL;
}
if (NULL != id)
printf("flags: 0x%x, %s\n", N_GETFLAG(*exhdr), id);
else
printf("flags: 0x%x\n", N_GETFLAG(*exhdr));
if (extended_info) {
unsigned long txt_addr;
unsigned long dat_addr;
unsigned long bss_addr;
/* N_TXTADDR and N_DATADDR macros DON'T WORK */
if (N_GETMAGIC(*exhdr) == ZMAGIC) {
txt_addr = __LDPGSZ;
dat_addr = ((txt_addr + exhdr->a_text + __LDPGSZ - 1) & ~(__LDPGSZ - 1));
} else if (N_GETMAGIC(*exhdr) == OMAGIC) {
txt_addr = 0;
dat_addr = txt_addr + exhdr->a_text;
} else {
txt_addr = 0xdeadbeef;
dat_addr = 0xcafebabe;
}
bss_addr = dat_addr + exhdr->a_data;
printf(" text segment size = 0x%lx, text segment file offset = %ld\n", exhdr->a_text, N_TXTOFF(*exhdr));
printf(" data segment size = 0x%lx, data segment file offset = %ld\n", exhdr->a_data, N_DATOFF(*exhdr));
printf(" bss segment size = 0x%lx\n", exhdr->a_bss);
printf(" text segment relocation size = 0x%lx, file offset = %ld, %d text relocations\n",
exhdr->a_trsize, N_TRELOFF(*exhdr), exhdr->a_trsize/sizeof(struct relocation_info));
printf(" data segment relocation size = 0x%lx, file offset = %ld, %d data relocations\n",
exhdr->a_drsize, N_DRELOFF(*exhdr), exhdr->a_drsize/sizeof(struct relocation_info));
printf(" symbol table size = 0x%lx, symbol table file offset = %ld (%d symbols)\n",
exhdr->a_syms, N_SYMOFF(*exhdr), exhdr->a_syms/sizeof(struct nlist));
printf(" string table file offset = 0x%lx (%d)\n", N_STROFF(*exhdr), N_STROFF(*exhdr));
printf(" entry point = 0x%lx\n", exhdr->a_entry);
printf(" text address = 0x%lx\n\tdata address = 0x%lx\n"
"\tbss address = 0x%lx\n",
txt_addr, dat_addr, bss_addr
/* N_TXTADDR(*exhdr), N_DATADDR(*exhdr), N_BSSADDR(*exhdr) */
);
}
}
int
__aout_fdnlist(int fd, struct nlist *list)
{
struct nlist *p, *s;
char *strtab;
off_t symoff, stroff;
u_long symsize;
int nent, cc;
int strsize, usemalloc = 0;
struct nlist nbuf[1024];
struct exec exec;
if (pread(fd, &exec, sizeof(exec), (off_t)0) != sizeof(exec) ||
N_BADMAG(exec) || exec.a_syms == NULL)
return (-1);
stroff = N_STROFF(exec);
symoff = N_SYMOFF(exec);
symsize = exec.a_syms;
/* Read in the size of the string table. */
if (pread(fd, (void *)&strsize, sizeof(strsize), stroff) !=
sizeof(strsize))
return (-1);
else
stroff += sizeof(strsize);
/*
* Read in the string table. We try mmap, but that will fail
* for /dev/ksyms so fall back on malloc. Since OpenBSD's malloc(3)
* returns memory to the system on free this does not cause bloat.
*/
strsize -= sizeof(strsize);
strtab = mmap(NULL, (size_t)strsize, PROT_READ, MAP_SHARED|MAP_FILE,
fd, stroff);
if (strtab == MAP_FAILED) {
usemalloc = 1;
if ((strtab = (char *)malloc(strsize)) == NULL)
return (-1);
errno = EIO;
if (pread(fd, strtab, strsize, stroff) != strsize) {
nent = -1;
goto aout_done;
}
}
/*
* clean out any left-over information for all valid entries.
* Type and value defined to be 0 if not found; historical
* versions cleared other and desc as well. Also figure out
* the largest string length so don't read any more of the
* string table than we have to.
*
* XXX clearing anything other than n_type and n_value violates
* the semantics given in the man page.
*/
nent = 0;
for (p = list; !ISLAST(p); ++p) {
p->n_type = 0;
p->n_other = 0;
p->n_desc = 0;
p->n_value = 0;
++nent;
}
while (symsize > 0) {
cc = MIN(symsize, sizeof(nbuf));
if (pread(fd, nbuf, cc, symoff) != cc)
break;
symsize -= cc;
symoff += cc;
for (s = nbuf; cc > 0; ++s, cc -= sizeof(*s)) {
char *sname = strtab + s->n_un.n_strx - sizeof(int);
if (s->n_un.n_strx == 0 || (s->n_type & N_STAB) != 0)
continue;
for (p = list; !ISLAST(p); p++) {
char *pname = p->n_un.n_name;
if (*sname != '_' && *pname == '_')
pname++;
if (!strcmp(sname, pname)) {
p->n_value = s->n_value;
p->n_type = s->n_type;
p->n_desc = s->n_desc;
p->n_other = s->n_other;
if (--nent <= 0)
break;
}
}
}
}
aout_done:
if (usemalloc)
free(strtab);
else
munmap(strtab, strsize);
return (nent);
}
