2015-12-24 15:47:51 +00:00
|
|
|
/*-
|
2017-08-10 14:18:09 +00:00
|
|
|
* Copyright (c) 2015-2017 Ruslan Bukin <br@bsdpad.com>
|
2015-12-24 15:47:51 +00:00
|
|
|
* All rights reserved.
|
|
|
|
*
|
|
|
|
* This software was developed by SRI International and the University of
|
|
|
|
* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
|
|
|
|
* ("CTSRD"), as part of the DARPA CRASH research programme.
|
|
|
|
*
|
|
|
|
* This software was developed by the University of Cambridge Computer
|
|
|
|
* Laboratory as part of the CTSRD Project, with support from the UK Higher
|
|
|
|
* Education Innovation Fund (HEIF).
|
|
|
|
*
|
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
|
|
* modification, are permitted provided that the following conditions
|
|
|
|
* are met:
|
|
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer.
|
|
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
|
|
* documentation and/or other materials provided with the distribution.
|
|
|
|
*
|
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
* SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
|
|
|
|
#include <sys/types.h>
|
|
|
|
|
|
|
|
#include <stdlib.h>
|
|
|
|
|
|
|
|
#include "debug.h"
|
|
|
|
#include "rtld.h"
|
|
|
|
#include "rtld_printf.h"
|
|
|
|
|
|
|
|
/*
|
|
|
|
* It is possible for the compiler to emit relocations for unaligned data.
|
|
|
|
* We handle this situation with these inlines.
|
|
|
|
*/
|
|
|
|
#define RELOC_ALIGNED_P(x) \
|
|
|
|
(((uintptr_t)(x) & (sizeof(void *) - 1)) == 0)
|
|
|
|
|
|
|
|
uint64_t
|
|
|
|
set_gp(Obj_Entry *obj)
|
|
|
|
{
|
|
|
|
uint64_t old;
|
|
|
|
SymLook req;
|
|
|
|
uint64_t gp;
|
|
|
|
int res;
|
|
|
|
|
|
|
|
__asm __volatile("mv %0, gp" : "=r"(old));
|
|
|
|
|
2017-08-10 14:18:09 +00:00
|
|
|
symlook_init(&req, "__global_pointer$");
|
2015-12-24 15:47:51 +00:00
|
|
|
req.ventry = NULL;
|
|
|
|
req.flags = SYMLOOK_EARLY;
|
|
|
|
res = symlook_obj(&req, obj);
|
|
|
|
|
|
|
|
if (res == 0) {
|
|
|
|
gp = req.sym_out->st_value;
|
|
|
|
__asm __volatile("mv gp, %0" :: "r"(gp));
|
|
|
|
}
|
|
|
|
|
|
|
|
return (old);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
init_pltgot(Obj_Entry *obj)
|
|
|
|
{
|
|
|
|
|
|
|
|
if (obj->pltgot != NULL) {
|
|
|
|
obj->pltgot[0] = (Elf_Addr)&_rtld_bind_start;
|
|
|
|
obj->pltgot[1] = (Elf_Addr)obj;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
do_copy_relocations(Obj_Entry *dstobj)
|
|
|
|
{
|
|
|
|
const Obj_Entry *srcobj, *defobj;
|
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
|
|
|
const Elf_Sym *srcsym;
|
|
|
|
const Elf_Sym *dstsym;
|
|
|
|
const void *srcaddr;
|
|
|
|
const char *name;
|
|
|
|
void *dstaddr;
|
|
|
|
SymLook req;
|
|
|
|
size_t size;
|
|
|
|
int res;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* COPY relocs are invalid outside of the main program
|
|
|
|
*/
|
|
|
|
assert(dstobj->mainprog);
|
|
|
|
|
2018-10-29 21:08:19 +00:00
|
|
|
relalim = (const Elf_Rela *)((const char *)dstobj->rela +
|
2015-12-24 15:47:51 +00:00
|
|
|
dstobj->relasize);
|
|
|
|
for (rela = dstobj->rela; rela < relalim; rela++) {
|
|
|
|
if (ELF_R_TYPE(rela->r_info) != R_RISCV_COPY)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
dstaddr = (void *)(dstobj->relocbase + rela->r_offset);
|
|
|
|
dstsym = dstobj->symtab + ELF_R_SYM(rela->r_info);
|
|
|
|
name = dstobj->strtab + dstsym->st_name;
|
|
|
|
size = dstsym->st_size;
|
|
|
|
|
|
|
|
symlook_init(&req, name);
|
|
|
|
req.ventry = fetch_ventry(dstobj, ELF_R_SYM(rela->r_info));
|
|
|
|
req.flags = SYMLOOK_EARLY;
|
|
|
|
|
2016-01-20 07:21:33 +00:00
|
|
|
for (srcobj = globallist_next(dstobj); srcobj != NULL;
|
|
|
|
srcobj = globallist_next(srcobj)) {
|
2015-12-24 15:47:51 +00:00
|
|
|
res = symlook_obj(&req, srcobj);
|
|
|
|
if (res == 0) {
|
|
|
|
srcsym = req.sym_out;
|
|
|
|
defobj = req.defobj_out;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (srcobj == NULL) {
|
|
|
|
_rtld_error(
|
|
|
|
"Undefined symbol \"%s\" referenced from COPY relocation in %s",
|
|
|
|
name, dstobj->path);
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
|
|
|
|
srcaddr = (const void *)(defobj->relocbase + srcsym->st_value);
|
|
|
|
memcpy(dstaddr, srcaddr, size);
|
|
|
|
}
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Process the PLT relocations.
|
|
|
|
*/
|
|
|
|
int
|
2018-12-15 10:38:07 +00:00
|
|
|
reloc_plt(Obj_Entry *obj, int flags __unused, RtldLockState *lockstate __unused)
|
2015-12-24 15:47:51 +00:00
|
|
|
{
|
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
|
|
|
|
2018-10-29 21:08:19 +00:00
|
|
|
relalim = (const Elf_Rela *)((const char *)obj->pltrela +
|
|
|
|
obj->pltrelasize);
|
2015-12-24 15:47:51 +00:00
|
|
|
for (rela = obj->pltrela; rela < relalim; rela++) {
|
|
|
|
Elf_Addr *where;
|
|
|
|
|
|
|
|
assert(ELF_R_TYPE(rela->r_info) == R_RISCV_JUMP_SLOT);
|
|
|
|
|
|
|
|
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
|
|
|
*where += (Elf_Addr)obj->relocbase;
|
|
|
|
}
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* LD_BIND_NOW was set - force relocation for all jump slots
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
reloc_jmpslots(Obj_Entry *obj, int flags, RtldLockState *lockstate)
|
|
|
|
{
|
|
|
|
const Obj_Entry *defobj;
|
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
|
|
|
const Elf_Sym *def;
|
|
|
|
|
2018-10-29 21:08:19 +00:00
|
|
|
relalim = (const Elf_Rela *)((const char *)obj->pltrela +
|
|
|
|
obj->pltrelasize);
|
2015-12-24 15:47:51 +00:00
|
|
|
for (rela = obj->pltrela; rela < relalim; rela++) {
|
|
|
|
Elf_Addr *where;
|
|
|
|
|
|
|
|
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
|
|
|
switch(ELF_R_TYPE(rela->r_info)) {
|
|
|
|
case R_RISCV_JUMP_SLOT:
|
|
|
|
def = find_symdef(ELF_R_SYM(rela->r_info), obj,
|
|
|
|
&defobj, SYMLOOK_IN_PLT | flags, NULL, lockstate);
|
|
|
|
if (def == NULL) {
|
|
|
|
dbg("reloc_jmpslots: sym not found");
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
|
|
|
|
*where = (Elf_Addr)(defobj->relocbase + def->st_value);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
_rtld_error("Unknown relocation type %x in jmpslot",
|
|
|
|
(unsigned int)ELF_R_TYPE(rela->r_info));
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
2018-10-29 21:08:19 +00:00
|
|
|
reloc_iresolve(Obj_Entry *obj __unused,
|
|
|
|
struct Struct_RtldLockState *lockstate __unused)
|
2015-12-24 15:47:51 +00:00
|
|
|
{
|
|
|
|
|
|
|
|
/* XXX not implemented */
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
2020-02-13 23:42:09 +00:00
|
|
|
int
|
|
|
|
reloc_iresolve_nonplt(Obj_Entry *obj __unused,
|
|
|
|
struct Struct_RtldLockState *lockstate __unused)
|
|
|
|
{
|
|
|
|
|
|
|
|
/* XXX not implemented */
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
2015-12-24 15:47:51 +00:00
|
|
|
int
|
2018-10-29 21:08:19 +00:00
|
|
|
reloc_gnu_ifunc(Obj_Entry *obj __unused, int flags __unused,
|
|
|
|
struct Struct_RtldLockState *lockstate __unused)
|
2015-12-24 15:47:51 +00:00
|
|
|
{
|
|
|
|
|
|
|
|
/* XXX not implemented */
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
Elf_Addr
|
2018-10-29 21:08:19 +00:00
|
|
|
reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
|
|
|
|
const Obj_Entry *defobj __unused, const Obj_Entry *obj __unused,
|
|
|
|
const Elf_Rel *rel)
|
2015-12-24 15:47:51 +00:00
|
|
|
{
|
|
|
|
|
|
|
|
assert(ELF_R_TYPE(rel->r_info) == R_RISCV_JUMP_SLOT);
|
|
|
|
|
2017-03-15 21:11:57 +00:00
|
|
|
if (*where != target && !ld_bind_not)
|
2015-12-24 15:47:51 +00:00
|
|
|
*where = target;
|
2017-03-15 21:11:57 +00:00
|
|
|
return (target);
|
2015-12-24 15:47:51 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Process non-PLT relocations
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
reloc_non_plt(Obj_Entry *obj, Obj_Entry *obj_rtld, int flags,
|
|
|
|
RtldLockState *lockstate)
|
|
|
|
{
|
|
|
|
const Obj_Entry *defobj;
|
|
|
|
const Elf_Rela *relalim;
|
|
|
|
const Elf_Rela *rela;
|
|
|
|
const Elf_Sym *def;
|
|
|
|
SymCache *cache;
|
|
|
|
Elf_Addr *where;
|
|
|
|
unsigned long symnum;
|
|
|
|
|
|
|
|
if ((flags & SYMLOOK_IFUNC) != 0)
|
|
|
|
/* XXX not implemented */
|
|
|
|
return (0);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The dynamic loader may be called from a thread, we have
|
|
|
|
* limited amounts of stack available so we cannot use alloca().
|
|
|
|
*/
|
|
|
|
if (obj == obj_rtld)
|
|
|
|
cache = NULL;
|
|
|
|
else
|
|
|
|
cache = calloc(obj->dynsymcount, sizeof(SymCache));
|
|
|
|
/* No need to check for NULL here */
|
|
|
|
|
2018-10-29 21:08:19 +00:00
|
|
|
relalim = (const Elf_Rela *)((const char *)obj->rela + obj->relasize);
|
2015-12-24 15:47:51 +00:00
|
|
|
for (rela = obj->rela; rela < relalim; rela++) {
|
|
|
|
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
|
|
|
symnum = ELF_R_SYM(rela->r_info);
|
|
|
|
|
|
|
|
switch (ELF_R_TYPE(rela->r_info)) {
|
|
|
|
case R_RISCV_JUMP_SLOT:
|
|
|
|
/* This will be handled by the plt/jmpslot routines */
|
|
|
|
break;
|
|
|
|
case R_RISCV_NONE:
|
|
|
|
break;
|
|
|
|
case R_RISCV_64:
|
|
|
|
def = find_symdef(symnum, obj, &defobj, flags, cache,
|
|
|
|
lockstate);
|
|
|
|
if (def == NULL)
|
|
|
|
return (-1);
|
|
|
|
|
|
|
|
*where = (Elf_Addr)(defobj->relocbase + def->st_value +
|
|
|
|
rela->r_addend);
|
|
|
|
break;
|
|
|
|
case R_RISCV_TLS_DTPMOD64:
|
|
|
|
def = find_symdef(symnum, obj, &defobj, flags, cache,
|
|
|
|
lockstate);
|
|
|
|
if (def == NULL)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
*where += (Elf_Addr)defobj->tlsindex;
|
|
|
|
break;
|
|
|
|
case R_RISCV_COPY:
|
|
|
|
/*
|
|
|
|
* These are deferred until all other relocations have
|
|
|
|
* been done. All we do here is make sure that the
|
|
|
|
* COPY relocation is not in a shared library. They
|
|
|
|
* are allowed only in executable files.
|
|
|
|
*/
|
|
|
|
if (!obj->mainprog) {
|
|
|
|
_rtld_error("%s: Unexpected R_RISCV_COPY "
|
|
|
|
"relocation in shared library", obj->path);
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case R_RISCV_TLS_DTPREL64:
|
|
|
|
def = find_symdef(symnum, obj, &defobj, flags, cache,
|
|
|
|
lockstate);
|
|
|
|
if (def == NULL)
|
|
|
|
return (-1);
|
|
|
|
/*
|
|
|
|
* We lazily allocate offsets for static TLS as we
|
|
|
|
* see the first relocation that references the
|
|
|
|
* TLS block. This allows us to support (small
|
|
|
|
* amounts of) static TLS in dynamically loaded
|
|
|
|
* modules. If we run out of space, we generate an
|
|
|
|
* error.
|
|
|
|
*/
|
|
|
|
if (!defobj->tls_done) {
|
2018-10-29 21:08:19 +00:00
|
|
|
if (!allocate_tls_offset(
|
|
|
|
__DECONST(Obj_Entry *, defobj))) {
|
2015-12-24 15:47:51 +00:00
|
|
|
_rtld_error(
|
|
|
|
"%s: No space available for static "
|
|
|
|
"Thread Local Storage", obj->path);
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
*where += (Elf_Addr)(def->st_value + rela->r_addend
|
|
|
|
- TLS_DTV_OFFSET);
|
|
|
|
break;
|
|
|
|
case R_RISCV_TLS_TPREL64:
|
|
|
|
def = find_symdef(symnum, obj, &defobj, flags, cache,
|
|
|
|
lockstate);
|
|
|
|
if (def == NULL)
|
|
|
|
return (-1);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We lazily allocate offsets for static TLS as we
|
|
|
|
* see the first relocation that references the
|
|
|
|
* TLS block. This allows us to support (small
|
|
|
|
* amounts of) static TLS in dynamically loaded
|
|
|
|
* modules. If we run out of space, we generate an
|
|
|
|
* error.
|
|
|
|
*/
|
|
|
|
if (!defobj->tls_done) {
|
2018-10-29 21:08:19 +00:00
|
|
|
if (!allocate_tls_offset(
|
|
|
|
__DECONST(Obj_Entry *, defobj))) {
|
2015-12-24 15:47:51 +00:00
|
|
|
_rtld_error(
|
|
|
|
"%s: No space available for static "
|
|
|
|
"Thread Local Storage", obj->path);
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
*where = (def->st_value + rela->r_addend +
|
2019-12-10 21:56:44 +00:00
|
|
|
defobj->tlsoffset - TLS_TP_OFFSET - TLS_TCB_SIZE);
|
2015-12-24 15:47:51 +00:00
|
|
|
break;
|
|
|
|
case R_RISCV_RELATIVE:
|
|
|
|
*where = (Elf_Addr)(obj->relocbase + rela->r_addend);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
rtld_printf("%s: Unhandled relocation %lu\n",
|
|
|
|
obj->path, ELF_R_TYPE(rela->r_info));
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
2016-11-15 09:43:26 +00:00
|
|
|
void
|
2016-11-21 14:13:57 +00:00
|
|
|
ifunc_init(Elf_Auxinfo aux_info[__min_size(AT_COUNT)] __unused)
|
2016-11-15 09:43:26 +00:00
|
|
|
{
|
2018-02-03 23:14:11 +00:00
|
|
|
|
|
|
|
}
|
|
|
|
|
2015-12-24 15:47:51 +00:00
|
|
|
void
|
|
|
|
allocate_initial_tls(Obj_Entry *objs)
|
|
|
|
{
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Fix the size of the static TLS block by using the maximum
|
|
|
|
* offset allocated so far and adding a bit for dynamic modules to
|
|
|
|
* use.
|
|
|
|
*/
|
|
|
|
tls_static_space = tls_last_offset + tls_last_size +
|
|
|
|
RTLD_STATIC_TLS_EXTRA;
|
|
|
|
|
2021-12-09 21:17:54 +00:00
|
|
|
_tcb_set(allocate_tls(objs, NULL, TLS_TCB_SIZE, TLS_TCB_ALIGN));
|
2015-12-24 15:47:51 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void *
|
|
|
|
__tls_get_addr(tls_index* ti)
|
|
|
|
{
|
2021-12-09 21:17:54 +00:00
|
|
|
uintptr_t **dtvp;
|
2015-12-24 15:47:51 +00:00
|
|
|
void *p;
|
|
|
|
|
2021-12-09 21:17:54 +00:00
|
|
|
dtvp = &_tcb_get()->tcb_dtv;
|
2021-11-17 23:50:55 +00:00
|
|
|
p = tls_get_addr_common(dtvp, ti->ti_module, ti->ti_offset);
|
2015-12-24 15:47:51 +00:00
|
|
|
|
2018-10-29 21:08:19 +00:00
|
|
|
return ((char*)p + TLS_DTV_OFFSET);
|
2015-12-24 15:47:51 +00:00
|
|
|
}
|