/*
* Extract a trace specification field, and setup the tracespec struct
* accordingly.
*/
const char *
_dl_trace_parse_spec(const char *var, struct tracespec *spec)
{
const char *start, *end;
if (*var == '!') {
spec->inverse = 1;
var++;
}
start = var;
end = _dl_strchr(start, ':');
if (end == NULL)
end = start + _dl_strlen(start);
if (end != start) {
spec->spec = _dl_malloc(1 + end - start);
if (spec->spec == NULL)
_dl_exit(8);
_dl_bcopy(start, spec->spec, end - start);
spec->spec[end - start] = '\0';
}
if (*end == ':')
end++;
return end;
}
int
_dl_md_reloc(elf_object_t *object, int rel, int relasz)
{
long i;
long numrela;
int fails = 0;
Elf64_Addr loff;
Elf64_Rela *relas;
struct load_list *llist;
loff = object->obj_base;
numrela = object->Dyn.info[relasz] / sizeof(Elf64_Rela);
relas = (Elf64_Rela *)(object->Dyn.info[rel]);
if (relas == NULL)
return(0);
/*
* unprotect some segments if we need it.
* XXX - we unprotect way to much. only the text can have cow
* relocations.
*/
if ((object->dyn.textrel == 1) && (rel == DT_REL || rel == DT_RELA)) {
for (llist = object->load_list; llist != NULL; llist = llist->next) {
if (!(llist->prot & PROT_WRITE)) {
_dl_mprotect(llist->start, llist->size,
llist->prot|PROT_WRITE);
}
}
}
for (i = 0; i < numrela; i++, relas++) {
Elf64_Addr *r_addr;
Elf64_Addr ooff;
const Elf64_Sym *sym, *this;
const char *symn;
r_addr = (Elf64_Addr *)(relas->r_offset + loff);
if (ELF64_R_SYM(relas->r_info) == 0xffffffff)
continue;
sym = object->dyn.symtab;
sym += ELF64_R_SYM(relas->r_info);
symn = object->dyn.strtab + sym->st_name;
this = NULL;
switch (ELF64_R_TYPE(relas->r_info)) {
case R_TYPE(REFQUAD):
ooff = _dl_find_symbol_bysym(object,
ELF64_R_SYM(relas->r_info), &this,
SYM_SEARCH_ALL|SYM_WARNNOTFOUND|SYM_NOTPLT,
sym, NULL);
if (this == NULL)
goto resolve_failed;
*r_addr += ooff + this->st_value + relas->r_addend;
break;
case R_TYPE(RELATIVE):
/*
* There is a lot of unaligned RELATIVE
* relocs generated by gcc in the exception handlers.
*/
if ((((Elf_Addr) r_addr) & 0x7) != 0) {
Elf_Addr tmp;
#if 0
_dl_printf("unaligned RELATIVE: %p type: %d %s 0x%lx -> 0x%lx\n", r_addr,
ELF_R_TYPE(relas->r_info), object->load_name, *r_addr, *r_addr+loff);
#endif
_dl_bcopy(r_addr, &tmp, sizeof(Elf_Addr));
tmp += loff;
_dl_bcopy(&tmp, r_addr, sizeof(Elf_Addr));
} else
*r_addr += loff;
break;
case R_TYPE(JMP_SLOT):
ooff = _dl_find_symbol(symn, &this,
SYM_SEARCH_ALL|SYM_WARNNOTFOUND|SYM_PLT,
sym, object, NULL);
if (this == NULL)
goto resolve_failed;
*r_addr = ooff + this->st_value + relas->r_addend;
break;
case R_TYPE(GLOB_DAT):
ooff = _dl_find_symbol_bysym(object,
ELF64_R_SYM(relas->r_info), &this,
SYM_SEARCH_ALL|SYM_WARNNOTFOUND|SYM_NOTPLT,
sym, NULL);
if (this == NULL)
goto resolve_failed;
*r_addr = ooff + this->st_value + relas->r_addend;
break;
case R_TYPE(NONE):
break;
default:
_dl_printf("%s:"
" %s: unsupported relocation '%s' %d at %lx\n",
_dl_progname, object->load_name, symn,
ELF64_R_TYPE(relas->r_info), r_addr );
_dl_exit(1);
}
continue;
resolve_failed:
if (ELF_ST_BIND(sym->st_info) != STB_WEAK)
fails++;
}
__asm __volatile("imb" : : : "memory");
/* reprotect the unprotected segments */
if ((object->dyn.textrel == 1) && (rel == DT_REL || rel == DT_RELA)) {
for (llist = object->load_list; llist != NULL; llist = llist->next) {
if (!(llist->prot & PROT_WRITE))
_dl_mprotect(llist->start, llist->size,
llist->prot);
}
}
return (fails);
}
int
_dl_md_reloc(elf_object_t *object, int rel, int relasz)
{
Elf_RelA *rela;
Elf_Addr loff;
int i, numrela, fails = 0;
size_t size;
loff = object->obj_base;
numrela = object->Dyn.info[relasz] / sizeof(Elf_RelA);
rela = (Elf_RelA *)(object->Dyn.info[rel]);
#ifdef DEBUG
DL_DEB(("object %s relasz %x, numrela %x loff %x\n",
object->load_name, object->Dyn.info[relasz], numrela, loff));
#endif
if (rela == NULL)
return (0);
/* either it's an ld bug or a wacky hpux abi */
if (!object->dyn.pltgot)
object->Dyn.info[DT_PLTGOT] += loff;
if (object->dyn.init && !((Elf_Addr)object->dyn.init & 2)) {
Elf_Addr addr = _dl_md_plabel((Elf_Addr)object->dyn.init,
object->dyn.pltgot);
#ifdef DEBUG
DL_DEB(("PLABEL32: %p:%p(_init) -> 0x%x in %s\n",
object->dyn.init, object->dyn.pltgot,
addr, object->load_name));
#endif
object->dyn.init = (void *)addr;
}
if (object->dyn.fini && !((Elf_Addr)object->dyn.fini & 2)) {
Elf_Addr addr = _dl_md_plabel((Elf_Addr)object->dyn.fini,
object->dyn.pltgot);
#ifdef DEBUG
DL_DEB(("PLABEL32: %p:%p(_fini) -> 0x%x in %s\n",
object->dyn.fini, object->dyn.pltgot,
addr, object->load_name));
#endif
object->dyn.fini = (void *)addr;
}
/*
* this is normally done by the crt0 code but we have to make
* sure it's set here to allow constructors to call functions
* that are overridden in the user binary (that are un-pic)
*/
if (object->obj_type == OBJTYPE_EXE)
_hppa_dl_set_dp(object->dyn.pltgot);
for (i = 0; i < numrela; i++, rela++) {
const elf_object_t *sobj;
const Elf_Sym *sym, *this;
Elf_Addr *pt, ooff;
const char *symn;
int type;
type = ELF_R_TYPE(rela->r_info);
if (type == RELOC_NONE)
continue;
sym = object->dyn.symtab + ELF_R_SYM(rela->r_info);
sobj = object;
symn = object->dyn.strtab + sym->st_name;
pt = (Elf_Addr *)(rela->r_offset + loff);
ooff = 0;
this = NULL;
if (ELF_R_SYM(rela->r_info) && sym->st_name) {
ooff = _dl_find_symbol_bysym(object,
ELF_R_SYM(rela->r_info), &this,
SYM_SEARCH_ALL|SYM_WARNNOTFOUND|
((type == RELOC_IPLT) ? SYM_PLT: SYM_NOTPLT),
sym, &sobj);
if (this == NULL) {
if (ELF_ST_BIND(sym->st_info) != STB_WEAK)
fails++;
continue;
}
}
#ifdef DEBUG
DL_DEB(("*pt=%x r_addend=%x r_sym=%x\n",
*pt, rela->r_addend, ELF_R_SYM(rela->r_info)));
#endif
switch (type) {
case RELOC_DIR32:
if (ELF_R_SYM(rela->r_info) && sym->st_name) {
*pt = ooff + this->st_value + rela->r_addend;
#ifdef DEBUG
DL_DEB(("[%x]DIR32: %s:%s -> 0x%x in %s\n",
i, symn, object->load_name,
*pt, sobj->load_name));
#endif
} else {
/*
* XXX should objects ever get their
* sections loaded insequential this
* would have to get a section number
* (ELF_R_SYM(rela->r_info))-1 and then:
* *pt = sect->addr + rela->r_addend;
*/
if (ELF_R_SYM(rela->r_info))
*pt += loff;
else
*pt += loff + rela->r_addend;
#ifdef DEBUG
DL_DEB(("[%x]DIR32: %s @ 0x%x\n", i,
object->load_name, *pt));
#endif
}
break;
case RELOC_PLABEL32:
if (ELF_R_SYM(rela->r_info)) {
if (ELF_ST_TYPE(this->st_info) != STT_FUNC) {
DL_DEB(("[%x]PLABEL32: bad\n", i));
break;
}
*pt = _dl_md_plabel(sobj->obj_base +
this->st_value + rela->r_addend,
sobj->dyn.pltgot);
#ifdef DEBUG
DL_DEB(("[%x]PLABEL32: %s:%s -> 0x%x in %s\n",
i, symn, object->load_name,
*pt, sobj->load_name));
#endif
} else {
*pt = loff + rela->r_addend;
#ifdef DEBUG
DL_DEB(("[%x]PLABEL32: %s @ 0x%x\n", i,
object->load_name, *pt));
#endif
}
break;
case RELOC_IPLT:
if (ELF_R_SYM(rela->r_info)) {
pt[0] = ooff + this->st_value + rela->r_addend;
pt[1] = (Elf_Addr)sobj->dyn.pltgot;
#ifdef DEBUG
DL_DEB(("[%x]IPLT: %s:%s -> 0x%x:0x%x in %s\n",
i, symn, object->load_name,
pt[0], pt[1], sobj->load_name));
#endif
} else {
pt[0] = loff + rela->r_addend;
pt[1] = (Elf_Addr)object->dyn.pltgot;
#ifdef DEBUG
DL_DEB(("[%x]IPLT: %s @ 0x%x:0x%x\n", i,
object->load_name, pt[0], pt[1]));
#endif
}
break;
case RELOC_COPY:
{
const Elf32_Sym *cpysrc = NULL;
size = sym->st_size;
ooff = _dl_find_symbol(symn, &cpysrc,
SYM_SEARCH_OTHER|SYM_WARNNOTFOUND|SYM_NOTPLT,
sym, object, NULL);
if (cpysrc) {
_dl_bcopy((void *)(ooff + cpysrc->st_value),
pt, sym->st_size);
#ifdef DEBUG
DL_DEB(("[%x]COPY: %s[%x]:%s -> %p[%x] in %s\n",
i, symn, ooff + cpysrc->st_value,
object->load_name, pt, sym->st_size,
sobj->load_name));
#endif
} else
DL_DEB(("[%x]COPY: no sym\n", i));
break;
}
default:
DL_DEB(("[%x]UNKNOWN(%d): type=%d off=0x%lx "
"addend=0x%lx rel=0x%x\n", i, type,
ELF_R_TYPE(rela->r_info), rela->r_offset,
rela->r_addend, *pt));
break;
}
}
return (fails);
}
int
_dl_md_reloc(elf_object_t *object, int rel, int relsz)
{
int i;
int numrel;
int fails = 0;
struct load_list *load_list;
Elf64_Addr loff;
Elf64_Addr ooff;
Elf64_Addr got_start, got_end;
Elf64_Rel *relocs;
const Elf64_Sym *sym, *this;
loff = object->obj_base;
numrel = object->Dyn.info[relsz] / sizeof(Elf64_Rel);
relocs = (Elf64_Rel *)(object->Dyn.info[rel]);
if (relocs == NULL)
return(0);
/*
* Change protection of all write protected segments in the
* object so we can do relocations in the .rodata section.
* After relocation restore protection.
*/
load_list = object->load_list;
while (load_list != NULL) {
if ((load_list->prot & PROT_WRITE) == 0)
_dl_mprotect(load_list->start, load_list->size,
load_list->prot|PROT_WRITE);
load_list = load_list->next;
}
/* XXX We need the got limits to know if reloc is in got. */
/* XXX Relocs against the got should not include the STUB address! */
this = NULL;
got_start = 0;
got_end = 0;
ooff = _dl_find_symbol("__got_start", &this,
SYM_SEARCH_OBJ|SYM_NOWARNNOTFOUND|SYM_PLT, NULL, object, NULL);
if (this != NULL)
got_start = ooff + this->st_value;
this = NULL;
ooff = _dl_find_symbol("__got_end", &this,
SYM_SEARCH_OBJ|SYM_NOWARNNOTFOUND|SYM_PLT, NULL, object, NULL);
if (this != NULL)
got_end = ooff + this->st_value;
DL_DEB(("relocating %d\n", numrel));
for (i = 0; i < numrel; i++, relocs++) {
Elf64_Addr r_addr = relocs->r_offset + loff;
const char *symn;
int type;
if (ELF64_R_SYM(relocs->r_info) == 0xffffff)
continue;
ooff = 0;
sym = object->dyn.symtab;
sym += ELF64_R_SYM(relocs->r_info);
symn = object->dyn.strtab + sym->st_name;
type = ELF64_R_TYPE(relocs->r_info);
this = NULL;
if (ELF64_R_SYM(relocs->r_info) &&
!(ELF64_ST_BIND(sym->st_info) == STB_LOCAL &&
ELF64_ST_TYPE (sym->st_info) == STT_NOTYPE)) {
ooff = _dl_find_symbol(symn, &this,
SYM_SEARCH_ALL | SYM_WARNNOTFOUND | SYM_PLT,
sym, object, NULL);
if (this == NULL) {
if (ELF_ST_BIND(sym->st_info) != STB_WEAK)
fails++;
continue;
}
}
switch (ELF64_R_TYPE(relocs->r_info)) {
/* XXX Handle non aligned relocs. .eh_frame
* XXX in libstdc++ seems to have them... */
u_int64_t robj;
case R_MIPS_REL32_64:
if (ELF64_ST_BIND(sym->st_info) == STB_LOCAL &&
(ELF64_ST_TYPE(sym->st_info) == STT_SECTION ||
ELF64_ST_TYPE(sym->st_info) == STT_NOTYPE) ) {
if ((long)r_addr & 7) {
_dl_bcopy((char *)r_addr, &robj, sizeof(robj));
robj += loff + sym->st_value;
_dl_bcopy(&robj, (char *)r_addr, sizeof(robj));
} else {
*(u_int64_t *)r_addr += loff + sym->st_value;
}
} else if (this && ((long)r_addr & 7)) {
_dl_bcopy((char *)r_addr, &robj, sizeof(robj));
robj += this->st_value + ooff;
_dl_bcopy(&robj, (char *)r_addr, sizeof(robj));
} else if (this) {
*(u_int64_t *)r_addr += this->st_value + ooff;
}
break;
case R_MIPS_NONE:
break;
default:
_dl_printf("%s: unsupported relocation '%d'\n",
_dl_progname, ELF64_R_TYPE(relocs->r_info));
_dl_exit(1);
}
}
DL_DEB(("done %d fails\n", fails));
load_list = object->load_list;
while (load_list != NULL) {
if ((load_list->prot & PROT_WRITE) == 0)
_dl_mprotect(load_list->start, load_list->size,
load_list->prot);
load_list = load_list->next;
}
return(fails);
}
/*
* char *dl_realpath(const char *path, char resolved[PATH_MAX]);
*
* Find the real name of path, by removing all ".", ".." and symlink
* components. Returns (resolved) on success, or (NULL) on failure,
* in which case the path which caused trouble is left in (resolved).
*/
char *
_dl_realpath(const char *path, char *resolved)
{
struct stat sb;
const char *p, *s;
char *q;
size_t left_len, resolved_len;
unsigned symlinks;
int slen, mem_allocated, ret;
char left[PATH_MAX], next_token[PATH_MAX], symlink[PATH_MAX];
if (path[0] == '\0') {
return (NULL);
}
if (resolved == NULL) {
resolved = _dl_malloc(PATH_MAX);
if (resolved == NULL)
return (NULL);
mem_allocated = 1;
} else
mem_allocated = 0;
symlinks = 0;
if (path[0] == '/') {
resolved[0] = '/';
resolved[1] = '\0';
if (path[1] == '\0')
return (resolved);
resolved_len = 1;
left_len = _dl_strlcpy(left, path + 1, sizeof(left));
} else {
if (_dl_getcwd(resolved, PATH_MAX) <= 0) {
if (mem_allocated)
_dl_free(resolved);
else
_dl_strlcpy(resolved, ".", PATH_MAX);
return (NULL);
}
resolved_len = _dl_strlen(resolved);
left_len = _dl_strlcpy(left, path, sizeof(left));
}
if (left_len >= sizeof(left) || resolved_len >= PATH_MAX) {
goto err;
}
/*
* Iterate over path components in `left'.
*/
while (left_len != 0) {
/*
* Extract the next path component and adjust `left'
* and its length.
*/
p = _dl_strchr(left, '/');
s = p ? p : left + left_len;
if (s - left >= sizeof(next_token)) {
goto err;
}
_dl_bcopy(left, next_token, s - left);
next_token[s - left] = '\0';
left_len -= s - left;
if (p != NULL)
_dl_bcopy(s + 1, left, left_len + 1);
if (resolved[resolved_len - 1] != '/') {
if (resolved_len + 1 >= PATH_MAX) {
goto err;
}
resolved[resolved_len++] = '/';
resolved[resolved_len] = '\0';
}
if (next_token[0] == '\0')
continue;
else if (_dl_strcmp(next_token, ".") == 0)
continue;
else if (_dl_strcmp(next_token, "..") == 0) {
/*
* Strip the last path component except when we have
* single "/"
*/
if (resolved_len > 1) {
resolved[resolved_len - 1] = '\0';
q = _dl_strrchr(resolved, '/') + 1;
*q = '\0';
resolved_len = q - resolved;
}
continue;
}
/*
* Append the next path component and lstat() it. If
* lstat() fails we still can return successfully if
* there are no more path components left.
*/
resolved_len = _dl_strlcat(resolved, next_token, PATH_MAX);
if (resolved_len >= PATH_MAX) {
goto err;
}
if ((ret = _dl_lstat(resolved, &sb)) != 0) {
if (ret == ENOENT && p == NULL) {
return (resolved);
}
goto err;
}
if (S_ISLNK(sb.st_mode)) {
if (symlinks++ > SYMLOOP_MAX) {
goto err;
}
slen = _dl_readlink(resolved, symlink, sizeof(symlink) - 1);
if (slen < 0)
goto err;
symlink[slen] = '\0';
if (symlink[0] == '/') {
resolved[1] = 0;
resolved_len = 1;
} else if (resolved_len > 1) {
/* Strip the last path component. */
resolved[resolved_len - 1] = '\0';
q = _dl_strrchr(resolved, '/') + 1;
*q = '\0';
resolved_len = q - resolved;
}
/*
* If there are any path components left, then
* append them to symlink. The result is placed
* in `left'.
*/
if (p != NULL) {
if (symlink[slen - 1] != '/') {
if (slen + 1 >= sizeof(symlink)) {
goto err;
}
symlink[slen] = '/';
symlink[slen + 1] = 0;
}
left_len = _dl_strlcat(symlink, left, sizeof(symlink));
if (left_len >= sizeof(left)) {
goto err;
}
}
left_len = _dl_strlcpy(left, symlink, sizeof(left));
}
}
/*
* Remove trailing slash except when the resolved pathname
* is a single "/".
*/
if (resolved_len > 1 && resolved[resolved_len - 1] == '/')
resolved[resolved_len - 1] = '\0';
return (resolved);
err:
if (mem_allocated)
_dl_free(resolved);
return (NULL);
}
int
_dl_md_reloc(elf_object_t *object, int rel, int relasz)
{
int i;
int numrela;
int relrel;
int fails = 0;
struct load_list *llist;
Elf32_Addr loff;
Elf32_Rela *relas;
loff = object->obj_base;
numrela = object->Dyn.info[relasz] / sizeof(Elf32_Rela);
relrel = rel == DT_RELA ? object->relacount : 0;
relas = (Elf32_Rela *)(object->Dyn.info[rel]);
#ifdef DL_PRINTF_DEBUG
_dl_printf("object relocation size %x, numrela %x\n",
object->Dyn.info[relasz], numrela);
#endif
if (relas == NULL)
return(0);
if (relrel > numrela) {
_dl_printf("relacount > numrela: %ld > %ld\n", relrel, numrela);
_dl_exit(20);
}
/*
* Change protection of all write protected segments in the object
* so we can do relocations such as PC32. After relocation,
* restore protection.
*/
if (object->dyn.textrel == 1 && (rel == DT_REL || rel == DT_RELA)) {
for (llist = object->load_list; llist != NULL;
llist = llist->next) {
if (!(llist->prot & PROT_WRITE)) {
_dl_mprotect(llist->start, llist->size,
llist->prot|PROT_WRITE);
}
}
}
/* tight loop for leading RELATIVE relocs */
for (i = 0; i < relrel; i++, relas++) {
Elf32_Addr *r_addr;
#ifdef DEBUG
if (ELF_R_TYPE(relas->r_info) != R_68K_RELATIVE) {
_dl_printf("RELACOUNT wrong\n");
_dl_exit(20);
}
#endif
r_addr = (Elf32_Addr *)(relas->r_offset + loff);
*r_addr = relas->r_addend + loff;
}
for (; i < numrela; i++, relas++) {
Elf32_Addr *r_addr = (Elf32_Addr *)(relas->r_offset + loff);
Elf32_Addr ooff, addend, newval;
const Elf32_Sym *sym, *this;
const char *symn;
int type;
Elf32_Addr prev_value = 0, prev_ooff = 0;
const Elf32_Sym *prev_sym = NULL;
type = ELF32_R_TYPE(relas->r_info);
if (type == R_68K_JMP_SLOT && rel != DT_JMPREL)
continue;
if (type == R_68K_NONE)
continue;
sym = object->dyn.symtab;
sym += ELF32_R_SYM(relas->r_info);
symn = object->dyn.strtab + sym->st_name;
if (type == R_68K_COPY) {
/*
* we need to find a symbol, that is not in the current
* object, start looking at the beginning of the list,
* searching all objects but _not_ the current object,
* first one found wins.
*/
const Elf32_Sym *cpysrc = NULL;
Elf32_Addr src_loff;
int size;
src_loff = 0;
src_loff = _dl_find_symbol(symn, &cpysrc,
SYM_SEARCH_OTHER|SYM_WARNNOTFOUND| SYM_NOTPLT,
sym, object, NULL);
if (cpysrc != NULL) {
size = sym->st_size;
if (sym->st_size != cpysrc->st_size) {
/* _dl_find_symbol() has warned
about this already */
size = sym->st_size < cpysrc->st_size ?
sym->st_size : cpysrc->st_size;
}
_dl_bcopy((void *)(src_loff + cpysrc->st_value),
r_addr, size);
} else
fails++;
continue;
}
if (ELF32_R_SYM(relas->r_info) &&
!(ELF32_ST_BIND(sym->st_info) == STB_LOCAL &&
ELF32_ST_TYPE (sym->st_info) == STT_NOTYPE) &&
sym != prev_sym) {
this = NULL;
ooff = _dl_find_symbol_bysym(object,
ELF32_R_SYM(relas->r_info), &this,
SYM_SEARCH_ALL|SYM_WARNNOTFOUND|
((type == R_68K_JMP_SLOT) ? SYM_PLT:SYM_NOTPLT),
sym, NULL);
if (this == NULL) {
if (ELF_ST_BIND(sym->st_info) != STB_WEAK)
fails++;
continue;
}
prev_sym = sym;
prev_value = this->st_value;
prev_ooff = ooff;
}
if (ELF32_ST_BIND(sym->st_info) == STB_LOCAL &&
(ELF32_ST_TYPE(sym->st_info) == STT_SECTION ||
ELF32_ST_TYPE(sym->st_info) == STT_NOTYPE))
addend = relas->r_addend;
else
addend = prev_value + relas->r_addend;
switch (type) {
case R_68K_PC32:
newval = prev_ooff + addend;
newval -= (Elf_Addr)r_addr;
*r_addr = newval;
break;
case R_68K_32:
case R_68K_GLOB_DAT:
case R_68K_JMP_SLOT:
newval = prev_ooff + addend;
*r_addr = newval;
break;
case R_68K_RELATIVE:
newval = loff + addend;
*r_addr = newval;
break;
default:
_dl_printf("%s:"
" %s: unsupported relocation '%s' %d at %x\n",
_dl_progname, object->load_name, symn,
ELF32_R_TYPE(relas->r_info), r_addr);
_dl_exit(1);
}
}
/* reprotect the unprotected segments */
if (object->dyn.textrel == 1 && (rel == DT_REL || rel == DT_RELA)) {
for (llist = object->load_list; llist != NULL;
llist = llist->next) {
if (!(llist->prot & PROT_WRITE))
_dl_mprotect(llist->start, llist->size,
llist->prot);
}
}
return(fails);
}
/*
* Perform $ORIGIN substitutions on path
*/
static void
_dl_origin_subst_path(elf_object_t *object, const char *origin_path,
char **path)
{
char tmp_path[PATH_MAX];
char *new_path, *tp;
const char *pp, *name, *value;
static struct utsname uts;
size_t value_len;
int skip_brace;
if (uts.sysname[0] == '\0') {
if (_dl_uname(&uts) != 0)
return;
}
tp = tmp_path;
pp = *path;
while (*pp != '\0' && (tp - tmp_path) < sizeof(tmp_path)) {
/* copy over chars up to but not including $ */
while (*pp != '\0' && *pp != '$' &&
(tp - tmp_path) < sizeof(tmp_path))
*tp++ = *pp++;
/* substitution sequence detected */
if (*pp == '$' && (tp - tmp_path) < sizeof(tmp_path)) {
pp++;
if ((skip_brace = (*pp == '{')))
pp++;
/* skip over name */
name = pp;
while (_dl_isalnum((unsigned char)*pp) || *pp == '_')
pp++;
switch (_dl_subst_name(name, pp - name)) {
case SUBST_ORIGIN:
value = origin_path;
break;
case SUBST_OSNAME:
value = uts.sysname;
break;
case SUBST_OSREL:
value = uts.release;
break;
case SUBST_PLATFORM:
value = uts.machine;
break;
default:
value = "";
}
value_len = _dl_strlen(value);
if (value_len >= sizeof(tmp_path) - (tp - tmp_path))
return;
_dl_bcopy(value, tp, value_len);
tp += value_len;
if (skip_brace && *pp == '}')
pp++;
}
}
/* no substitution made if result exceeds sizeof(tmp_path) */
if (tp - tmp_path >= sizeof(tmp_path))
return;
/* NULL terminate tmp_path */
*tp = '\0';
if (_dl_strcmp(tmp_path, *path) == 0)
return;
new_path = _dl_strdup(tmp_path);
if (new_path == NULL)
return;
DL_DEB(("orig_path %s\n", *path));
DL_DEB(("new_path %s\n", new_path));
_dl_free(*path);
*path = new_path;
}
int
_dl_md_reloc(elf_object_t *object, int rel, int relsz)
{
long i;
long numrel;
long relrel;
int fails = 0;
Elf_Addr loff;
Elf_Addr prev_value = 0;
const Elf_Sym *prev_sym = NULL;
Elf_RelA *rels;
struct load_list *llist;
loff = object->obj_base;
numrel = object->Dyn.info[relsz] / sizeof(Elf_RelA);
relrel = rel == DT_RELA ? object->relacount : 0;
rels = (Elf_RelA *)(object->Dyn.info[rel]);
if (rels == NULL)
return(0);
if (relrel > numrel) {
_dl_printf("relacount > numrel: %ld > %ld\n", relrel, numrel);
_dl_exit(20);
}
/*
* unprotect some segments if we need it.
*/
if ((object->dyn.textrel == 1) && (rel == DT_REL || rel == DT_RELA)) {
for (llist = object->load_list; llist != NULL; llist = llist->next) {
if (!(llist->prot & PROT_WRITE))
_dl_mprotect(llist->start, llist->size,
PROT_READ | PROT_WRITE);
}
}
/* tight loop for leading RELATIVE relocs */
for (i = 0; i < relrel; i++, rels++) {
Elf_Addr *where;
#ifdef DEBUG
if (ELF_R_TYPE(rels->r_info) != R_TYPE(RELATIVE)) {
_dl_printf("RELACOUNT wrong\n");
_dl_exit(20);
}
#endif
where = (Elf_Addr *)(rels->r_offset + loff);
*where = rels->r_addend + loff;
}
for (; i < numrel; i++, rels++) {
Elf_Addr *where, value, ooff, mask;
Elf_Word type;
const Elf_Sym *sym, *this;
const char *symn;
type = ELF_R_TYPE(rels->r_info);
if (RELOC_ERROR(type)) {
_dl_printf("relocation error %d idx %d\n", type, i);
_dl_exit(20);
}
if (type == R_TYPE(NONE))
continue;
if (type == R_TYPE(JUMP_SLOT) && rel != DT_JMPREL)
continue;
where = (Elf_Addr *)(rels->r_offset + loff);
if (RELOC_USE_ADDEND(type))
value = rels->r_addend;
else
value = 0;
sym = NULL;
symn = NULL;
if (RELOC_RESOLVE_SYMBOL(type)) {
sym = object->dyn.symtab;
sym += ELF_R_SYM(rels->r_info);
symn = object->dyn.strtab + sym->st_name;
if (sym->st_shndx != SHN_UNDEF &&
ELF_ST_BIND(sym->st_info) == STB_LOCAL) {
value += loff;
} else if (sym == prev_sym) {
value += prev_value;
} else {
this = NULL;
ooff = _dl_find_symbol_bysym(object,
ELF_R_SYM(rels->r_info), &this,
SYM_SEARCH_ALL|SYM_WARNNOTFOUND|
((type == R_TYPE(JUMP_SLOT))?
SYM_PLT:SYM_NOTPLT),
sym, NULL);
if (this == NULL) {
resolve_failed:
if (ELF_ST_BIND(sym->st_info) !=
STB_WEAK)
fails++;
continue;
}
prev_sym = sym;
prev_value = (Elf_Addr)(ooff + this->st_value);
value += prev_value;
}
}
if (type == R_TYPE(JUMP_SLOT)) {
_dl_reloc_plt(where, value);
continue;
}
if (type == R_TYPE(COPY)) {
void *dstaddr = where;
const void *srcaddr;
const Elf_Sym *dstsym = sym, *srcsym = NULL;
Elf_Addr soff;
soff = _dl_find_symbol(symn, &srcsym,
SYM_SEARCH_OTHER|SYM_WARNNOTFOUND|SYM_NOTPLT,
dstsym, object, NULL);
if (srcsym == NULL)
goto resolve_failed;
srcaddr = (void *)(soff + srcsym->st_value);
_dl_bcopy(srcaddr, dstaddr, dstsym->st_size);
continue;
}
if (RELOC_PC_RELATIVE(type))
value -= (Elf_Addr)where;
if (RELOC_BASE_RELATIVE(type))
value += loff;
mask = RELOC_VALUE_BITMASK(type);
value >>= RELOC_VALUE_RIGHTSHIFT(type);
value &= mask;
if (RELOC_TARGET_SIZE(type) > 32) {
*where &= ~mask;
*where |= value;
} else {
Elf32_Addr *where32 = (Elf32_Addr *)where;
*where32 &= ~mask;
*where32 |= value;
}
}
/* reprotect the unprotected segments */
if ((object->dyn.textrel == 1) && (rel == DT_REL || rel == DT_RELA)) {
for (llist = object->load_list; llist != NULL; llist = llist->next) {
if (!(llist->prot & PROT_WRITE))
_dl_mprotect(llist->start, llist->size,
llist->prot);
}
}
return (fails);
}
