/* Process one elf relocation with addend. */
int
elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
elf_lookup_fn lookup)
{
const Elf_Rela *rela;
Elf_Word *where32;
Elf_Addr *where;
Elf_Size rtype, symidx;
Elf_Addr value;
Elf_Addr mask;
Elf_Addr addr;
if (type != ELF_RELOC_RELA)
return (-1);
rela = (const Elf_Rela *)data;
where = (Elf_Addr *)(relocbase + rela->r_offset);
where32 = (Elf_Word *)where;
rtype = ELF64_R_TYPE_ID(rela->r_info);
symidx = ELF_R_SYM(rela->r_info);
if (rtype == R_SPARC_NONE || rtype == R_SPARC_RELATIVE)
return (0);
if (rtype == R_SPARC_JMP_SLOT || rtype == R_SPARC_COPY ||
rtype >= sizeof(reloc_target_bitmask) /
sizeof(*reloc_target_bitmask))
return (-1);
if (RELOC_UNALIGNED(rtype))
return (-1);
value = rela->r_addend;
if (RELOC_RESOLVE_SYMBOL(rtype)) {
addr = lookup(lf, symidx, 1);
if (addr == 0)
return (-1);
value += addr;
}
if (rtype == R_SPARC_OLO10)
value = (value & 0x3ff) + ELF64_R_TYPE_DATA(rela->r_info);
if (RELOC_PC_RELATIVE(rtype))
value -= (Elf_Addr)where;
if (RELOC_BASE_RELATIVE(rtype)) {
value = elf_relocaddr(lf, value + relocbase);
}
mask = RELOC_VALUE_BITMASK(rtype);
value >>= RELOC_VALUE_RIGHTSHIFT(rtype);
value &= mask;
if (RELOC_TARGET_SIZE(rtype) > 32) {
*where &= ~mask;
*where |= value;
} else {
*where32 &= ~mask;
*where32 |= value;
}
return (0);
}
/* Process one elf relocation with addend. */
int
elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
elf_lookup_fn lookup)
{
const Elf_Rela *rela;
Elf_Word *where32;
Elf_Addr *where;
Elf_Size rtype, symidx;
Elf_Addr value;
Elf_Addr mask;
Elf_Addr addr;
int error;
if (type != ELF_RELOC_RELA)
return (-1);
rela = (const Elf_Rela *)data;
where = (Elf_Addr *)(relocbase + rela->r_offset);
where32 = (Elf_Word *)where;
rtype = ELF64_R_TYPE_ID(rela->r_info);
symidx = ELF_R_SYM(rela->r_info);
if (rtype == R_SPARC_NONE || rtype == R_SPARC_RELATIVE)
return (0);
if (rtype == R_SPARC_JMP_SLOT || rtype == R_SPARC_COPY ||
rtype >= nitems(reloc_target_bitmask)) {
printf("kldload: unexpected relocation type %ld\n", rtype);
return (-1);
}
if (RELOC_UNALIGNED(rtype)) {
printf("kldload: unaligned relocation type %ld\n", rtype);
return (-1);
}
value = rela->r_addend;
if (RELOC_RESOLVE_SYMBOL(rtype)) {
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
value += addr;
if (RELOC_BARE_SYMBOL(rtype))
value = elf_relocaddr(lf, value);
}
if (rtype == R_SPARC_OLO10)
value = (value & 0x3ff) + ELF64_R_TYPE_DATA(rela->r_info);
if (rtype == R_SPARC_HIX22)
value ^= 0xffffffffffffffff;
if (RELOC_PC_RELATIVE(rtype))
value -= (Elf_Addr)where;
if (RELOC_BASE_RELATIVE(rtype))
value = elf_relocaddr(lf, value + relocbase);
mask = RELOC_VALUE_BITMASK(rtype);
value >>= RELOC_VALUE_RIGHTSHIFT(rtype);
value &= mask;
if (rtype == R_SPARC_LOX10)
value |= 0x1c00;
if (RELOC_TARGET_SIZE(rtype) > 32) {
*where &= ~mask;
*where |= value;
} else {
*where32 &= ~mask;
*where32 |= value;
}
return (0);
}
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);
}
