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freebsd-dev/libexec/rtld-elf/mips/reloc.c
Alex Richardson 903e0ffd07 rtld-elf: compile with WANRS=4 warnings other than -Wcast-align 
Reviewed By:	kib
Approved By:	brooks (mentor)
Differential Revision: https://reviews.freebsd.org/D17153
2018-10-29 21:08:19 +00:00

842 lines
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/* $NetBSD: mips_reloc.c,v 1.58 2010/01/14 11:57:06 skrll Exp $ */
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright 1997 Michael L. Hitch <mhitch@montana.edu>
* Portions copyright 2002 Charles M. Hannum <root@ihack.net>
* All rights reserved.
*
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 <sys/stat.h>
#include <sys/endian.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <machine/sysarch.h>
#include <machine/tls.h>
#include "debug.h"
#include "rtld.h"
#ifdef __mips_n64
#define GOT1_MASK 0x8000000000000000UL
#else
#define GOT1_MASK 0x80000000UL
#endif
/*
* Determine if the second GOT entry is reserved for rtld or if it is
* the first "real" GOT entry.
*
* This must be a macro rather than a function so that
* _rtld_relocate_nonplt_self doesn't trigger a GOT invocation trying
* to use it before the local GOT entries in rtld are adjusted.
*/
#ifdef __mips_n64
/* Old binutils uses the 32-bit GOT1 mask value for N64. */
#define GOT1_RESERVED_FOR_RTLD(got) \
(((got)[1] == 0x80000000) || (got)[1] & GOT1_MASK)
#else
#define GOT1_RESERVED_FOR_RTLD(got) ((got)[1] & GOT1_MASK)
#endif
#ifdef __mips_n64
/*
* ELF64 MIPS encodes the relocs uniquely. The first 32-bits of info contain
* the symbol index. The top 32-bits contain three relocation types encoded
* in big-endian integer with first relocation in LSB. This means for little
* endian we have to byte swap that integer (r_type).
*/
#define Elf_Sxword Elf64_Sxword
#define ELF_R_NXTTYPE_64_P(r_type) ((((r_type) >> 8) & 0xff) == R_TYPE(64))
#if BYTE_ORDER == LITTLE_ENDIAN
#undef ELF_R_SYM
#undef ELF_R_TYPE
#define ELF_R_SYM(r_info) ((r_info) & 0xffffffff)
#define ELF_R_TYPE(r_info) bswap32((r_info) >> 32)
#endif
#else
#define ELF_R_NXTTYPE_64_P(r_type) (0)
#define Elf_Sxword Elf32_Sword
#endif
void _rtld_pltbind_start(void);
void
init_pltgot(Obj_Entry *obj)
{
if (obj->pltgot != NULL) {
obj->pltgot[0] = (Elf_Addr) &_rtld_bind_start;
if (GOT1_RESERVED_FOR_RTLD(obj->pltgot))
obj->pltgot[1] = (Elf_Addr) obj | GOT1_MASK;
}
if (obj->mips_pltgot != NULL) {
obj->mips_pltgot[0] = (Elf_Addr) &_rtld_pltbind_start;
obj->mips_pltgot[1] = (Elf_Addr) obj;
}
}
int
do_copy_relocations(Obj_Entry *dstobj)
{
const Obj_Entry *srcobj, *defobj;
const Elf_Rel *rellim;
const Elf_Rel *rel;
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);
rellim = (const Elf_Rel *)((const char *)dstobj->rel + dstobj->relsize);
for (rel = dstobj->rel; rel < rellim; rel++) {
if (ELF_R_TYPE(rel->r_info) != R_MIPS_COPY)
continue;
dstaddr = (void *)(dstobj->relocbase + rel->r_offset);
dstsym = dstobj->symtab + ELF_R_SYM(rel->r_info);
name = dstobj->strtab + dstsym->st_name;
size = dstsym->st_size;
symlook_init(&req, name);
req.ventry = fetch_ventry(dstobj, ELF_R_SYM(rel->r_info));
req.flags = SYMLOOK_EARLY;
for (srcobj = globallist_next(dstobj); srcobj != NULL;
srcobj = globallist_next(srcobj)) {
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);
}
void _rtld_relocate_nonplt_self(Elf_Dyn *, Elf_Addr);
/*
* It is possible for the compiler to emit relocations for unaligned data.
* We handle this situation with these inlines.
*/
static __inline Elf_Sxword
load_ptr(void *where, size_t len)
{
Elf_Sxword val;
if (__predict_true(((uintptr_t)where & (len - 1)) == 0)) {
#ifdef __mips_n64
if (len == sizeof(Elf_Sxword))
return *(Elf_Sxword *)where;
#endif
return *(Elf_Sword *)where;
}
val = 0;
#if BYTE_ORDER == LITTLE_ENDIAN
(void)memcpy(&val, where, len);
#endif
#if BYTE_ORDER == BIG_ENDIAN
(void)memcpy((uint8_t *)((&val)+1) - len, where, len);
#endif
return (len == sizeof(Elf_Sxword)) ? val : (Elf_Sword)val;
}
static __inline void
store_ptr(void *where, Elf_Sxword val, size_t len)
{
if (__predict_true(((uintptr_t)where & (len - 1)) == 0)) {
#ifdef __mips_n64
if (len == sizeof(Elf_Sxword)) {
*(Elf_Sxword *)where = val;
return;
}
#endif
*(Elf_Sword *)where = val;
return;
}
#if BYTE_ORDER == LITTLE_ENDIAN
(void)memcpy(where, &val, len);
#endif
#if BYTE_ORDER == BIG_ENDIAN
(void)memcpy(where, (const uint8_t *)((&val)+1) - len, len);
#endif
}
void
_rtld_relocate_nonplt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
{
const Elf_Rel *rel = NULL, *rellim;
Elf_Addr relsz = 0;
const Elf_Sym *symtab = NULL, *sym;
Elf_Addr *where;
Elf_Addr *got = NULL;
Elf_Word local_gotno = 0, symtabno = 0, gotsym = 0;
size_t i;
for (; dynp->d_tag != DT_NULL; dynp++) {
switch (dynp->d_tag) {
case DT_REL:
rel = (const Elf_Rel *)(relocbase + dynp->d_un.d_ptr);
break;
case DT_RELSZ:
relsz = dynp->d_un.d_val;
break;
case DT_SYMTAB:
symtab = (const Elf_Sym *)(relocbase + dynp->d_un.d_ptr);
break;
case DT_PLTGOT:
got = (Elf_Addr *)(relocbase + dynp->d_un.d_ptr);
break;
case DT_MIPS_LOCAL_GOTNO:
local_gotno = dynp->d_un.d_val;
break;
case DT_MIPS_SYMTABNO:
symtabno = dynp->d_un.d_val;
break;
case DT_MIPS_GOTSYM:
gotsym = dynp->d_un.d_val;
break;
}
}
i = GOT1_RESERVED_FOR_RTLD(got) ? 2 : 1;
/* Relocate the local GOT entries */
got += i;
for (; i < local_gotno; i++) {
*got++ += relocbase;
}
sym = symtab + gotsym;
/* Now do the global GOT entries */
for (i = gotsym; i < symtabno; i++) {
*got = sym->st_value + relocbase;
++sym;
++got;
}
rellim = (const Elf_Rel *)((const char *)rel + relsz);
for (; rel < rellim; rel++) {
Elf_Word r_symndx, r_type;
where = (void *)(relocbase + rel->r_offset);
r_symndx = ELF_R_SYM(rel->r_info);
r_type = ELF_R_TYPE(rel->r_info);
switch (r_type & 0xff) {
case R_TYPE(REL32): {
const size_t rlen =
ELF_R_NXTTYPE_64_P(r_type)
? sizeof(Elf_Sxword)
: sizeof(Elf_Sword);
Elf_Sxword old = load_ptr(where, rlen);
Elf_Sxword val = old;
#ifdef __mips_n64
assert(r_type == R_TYPE(REL32)
|| r_type == (R_TYPE(REL32)|(R_TYPE(64) << 8)));
#endif
assert(r_symndx < gotsym);
sym = symtab + r_symndx;
assert(ELF_ST_BIND(sym->st_info) == STB_LOCAL);
val += relocbase;
dbg("REL32/L(%p) %p -> %p in <self>",
where, (void *)old, (void *)val);
store_ptr(where, val, rlen);
break;
}
case R_TYPE(GPREL32):
case R_TYPE(NONE):
break;
default:
abort();
break;
}
}
}
Elf_Addr
_mips_rtld_bind(Obj_Entry *obj, Elf_Size reloff)
{
Elf_Addr *got = obj->pltgot;
const Elf_Sym *def;
const Obj_Entry *defobj;
Elf_Addr *where;
Elf_Addr target;
RtldLockState lockstate;
rlock_acquire(rtld_bind_lock, &lockstate);
if (sigsetjmp(lockstate.env, 0) != 0)
lock_upgrade(rtld_bind_lock, &lockstate);
where = &got[obj->local_gotno + reloff - obj->gotsym];
def = find_symdef(reloff, obj, &defobj, SYMLOOK_IN_PLT, NULL,
&lockstate);
if (def == NULL)
rtld_die();
target = (Elf_Addr)(defobj->relocbase + def->st_value);
dbg("bind now/fixup at %s sym # %jd in %s --> was=%p new=%p",
obj->path,
(intmax_t)reloff, defobj->strtab + def->st_name,
(void *)*where, (void *)target);
if (!ld_bind_not)
*where = target;
lock_release(rtld_bind_lock, &lockstate);
return (Elf_Addr)target;
}
int
reloc_non_plt(Obj_Entry *obj, Obj_Entry *obj_rtld, int flags,
RtldLockState *lockstate)
{
const Elf_Rel *rel;
const Elf_Rel *rellim;
Elf_Addr *got = obj->pltgot;
const Elf_Sym *sym, *def;
const Obj_Entry *defobj;
Elf_Word i;
#ifdef SUPPORT_OLD_BROKEN_LD
int broken;
#endif
/* The relocation for the dynamic loader has already been done. */
if (obj == obj_rtld)
return (0);
if ((flags & SYMLOOK_IFUNC) != 0)
/* XXX not implemented */
return (0);
#ifdef SUPPORT_OLD_BROKEN_LD
broken = 0;
sym = obj->symtab;
for (i = 1; i < 12; i++)
if (sym[i].st_info == ELF_ST_INFO(STB_LOCAL, STT_NOTYPE))
broken = 1;
dbg("%s: broken=%d", obj->path, broken);
#endif
i = GOT1_RESERVED_FOR_RTLD(got) ? 2 : 1;
/* Relocate the local GOT entries */
got += i;
dbg("got:%p for %d entries adding %p",
got, obj->local_gotno, obj->relocbase);
for (; i < obj->local_gotno; i++) {
*got += (Elf_Addr)obj->relocbase;
got++;
}
sym = obj->symtab + obj->gotsym;
dbg("got:%p for %d entries",
got, obj->symtabno);
/* Now do the global GOT entries */
for (i = obj->gotsym; i < obj->symtabno; i++) {
dbg(" doing got %d sym %p (%s, %lx)", i - obj->gotsym, sym,
sym->st_name + obj->strtab, (u_long) *got);
#ifdef SUPPORT_OLD_BROKEN_LD
if (ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
broken && sym->st_shndx == SHN_UNDEF) {
/*
* XXX DANGER WILL ROBINSON!
* You might think this is stupid, as it intentionally
* defeats lazy binding -- and you'd be right.
* Unfortunately, for lazy binding to work right, we
* need to a way to force the GOT slots used for
* function pointers to be resolved immediately. This
* is supposed to be done automatically by the linker,
* by not outputting a PLT slot and setting st_value
* to 0 if there are non-PLT references, but older
* versions of GNU ld do not do this.
*/
def = find_symdef(i, obj, &defobj, flags, NULL,
lockstate);
if (def == NULL)
return -1;
*got = def->st_value + (Elf_Addr)defobj->relocbase;
} else
#endif
if (ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
sym->st_value != 0 && sym->st_shndx == SHN_UNDEF) {
/*
* If there are non-PLT references to the function,
* st_value should be 0, forcing us to resolve the
* address immediately.
*
* XXX DANGER WILL ROBINSON!
* The linker is not outputting PLT slots for calls to
* functions that are defined in the same shared
* library. This is a bug, because it can screw up
* link ordering rules if the symbol is defined in
* more than one module. For now, if there is a
* definition, we fail the test above and force a full
* symbol lookup. This means that all intra-module
* calls are bound immediately. - mycroft, 2003/09/24
*/
*got = sym->st_value + (Elf_Addr)obj->relocbase;
if ((Elf_Addr)(*got) == (Elf_Addr)obj->relocbase) {
dbg("Warning2, i:%d maps to relocbase address:%p",
i, obj->relocbase);
}
} else if (sym->st_info == ELF_ST_INFO(STB_GLOBAL, STT_SECTION)) {
/* Symbols with index SHN_ABS are not relocated. */
if (sym->st_shndx != SHN_ABS) {
*got = sym->st_value +
(Elf_Addr)obj->relocbase;
if ((Elf_Addr)(*got) == (Elf_Addr)obj->relocbase) {
dbg("Warning3, i:%d maps to relocbase address:%p",
i, obj->relocbase);
}
}
} else {
/* TODO: add cache here */
def = find_symdef(i, obj, &defobj, flags, NULL,
lockstate);
if (def == NULL) {
dbg("Warning4, can't find symbole %d", i);
return -1;
}
*got = def->st_value + (Elf_Addr)defobj->relocbase;
if ((Elf_Addr)(*got) == (Elf_Addr)obj->relocbase) {
dbg("Warning4, i:%d maps to relocbase address:%p",
i, obj->relocbase);
dbg("via first obj symbol %s",
obj->strtab + obj->symtab[i].st_name);
dbg("found in obj %p:%s",
defobj, defobj->path);
}
}
dbg(" --> now %lx", (u_long) *got);
++sym;
++got;
}
got = obj->pltgot;
rellim = (const Elf_Rel *)((const char *)obj->rel + obj->relsize);
for (rel = obj->rel; rel < rellim; rel++) {
Elf_Word r_symndx, r_type;
void *where;
where = obj->relocbase + rel->r_offset;
r_symndx = ELF_R_SYM(rel->r_info);
r_type = ELF_R_TYPE(rel->r_info);
switch (r_type & 0xff) {
case R_TYPE(NONE):
break;
case R_TYPE(REL32): {
/* 32-bit PC-relative reference */
const size_t rlen =
ELF_R_NXTTYPE_64_P(r_type)
? sizeof(Elf_Sxword)
: sizeof(Elf_Sword);
Elf_Sxword old = load_ptr(where, rlen);
Elf_Sxword val = old;
def = obj->symtab + r_symndx;
if (r_symndx >= obj->gotsym) {
val += got[obj->local_gotno + r_symndx - obj->gotsym];
dbg("REL32/G(%p) %p --> %p (%s) in %s",
where, (void *)old, (void *)val,
obj->strtab + def->st_name,
obj->path);
} else {
/*
* XXX: ABI DIFFERENCE!
*
* Old NetBSD binutils would generate shared
* libs with section-relative relocations being
* already adjusted for the start address of
* the section.
*
* New binutils, OTOH, generate shared libs
* with the same relocations being based at
* zero, so we need to add in the start address
* of the section.
*
* --rkb, Oct 6, 2001
*/
if (def->st_info ==
ELF_ST_INFO(STB_LOCAL, STT_SECTION)
#ifdef SUPPORT_OLD_BROKEN_LD
&& !broken
#endif
)
val += (Elf_Addr)def->st_value;
val += (Elf_Addr)obj->relocbase;
dbg("REL32/L(%p) %p -> %p (%s) in %s",
where, (void *)old, (void *)val,
obj->strtab + def->st_name, obj->path);
}
store_ptr(where, val, rlen);
break;
}
case R_TYPE(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_MIPS_COPY "
"relocation in shared library", obj->path);
return (-1);
}
break;
#ifdef __mips_n64
case R_TYPE(TLS_DTPMOD64):
#else
case R_TYPE(TLS_DTPMOD32):
#endif
{
const size_t rlen = sizeof(Elf_Addr);
Elf_Addr old = load_ptr(where, rlen);
Elf_Addr val = old;
def = find_symdef(r_symndx, obj, &defobj, flags, NULL,
lockstate);
if (def == NULL)
return -1;
val += (Elf_Addr)defobj->tlsindex;
store_ptr(where, val, rlen);
dbg("DTPMOD %s in %s %p --> %p in %s",
obj->strtab + obj->symtab[r_symndx].st_name,
obj->path, (void *)old, (void*)val, defobj->path);
break;
}
#ifdef __mips_n64
case R_TYPE(TLS_DTPREL64):
#else
case R_TYPE(TLS_DTPREL32):
#endif
{
const size_t rlen = sizeof(Elf_Addr);
Elf_Addr old = load_ptr(where, rlen);
Elf_Addr val = old;
def = find_symdef(r_symndx, obj, &defobj, flags, NULL,
lockstate);
if (def == NULL)
return -1;
if (!defobj->tls_done && allocate_tls_offset(obj))
return -1;
val += (Elf_Addr)def->st_value - TLS_DTP_OFFSET;
store_ptr(where, val, rlen);
dbg("DTPREL %s in %s %p --> %p in %s",
obj->strtab + obj->symtab[r_symndx].st_name,
obj->path, (void*)old, (void *)val, defobj->path);
break;
}
#ifdef __mips_n64
case R_TYPE(TLS_TPREL64):
#else
case R_TYPE(TLS_TPREL32):
#endif
{
const size_t rlen = sizeof(Elf_Addr);
Elf_Addr old = load_ptr(where, rlen);
Elf_Addr val = old;
def = find_symdef(r_symndx, obj, &defobj, flags, NULL,
lockstate);
if (def == NULL)
return -1;
if (!defobj->tls_done && allocate_tls_offset(obj))
return -1;
val += (Elf_Addr)(def->st_value + defobj->tlsoffset
- TLS_TP_OFFSET - TLS_TCB_SIZE);
store_ptr(where, val, rlen);
dbg("TPREL %s in %s %p --> %p in %s",
obj->strtab + obj->symtab[r_symndx].st_name,
obj->path, (void*)old, (void *)val, defobj->path);
break;
}
default:
dbg("sym = %lu, type = %lu, offset = %p, "
"contents = %p, symbol = %s",
(u_long)r_symndx, (u_long)ELF_R_TYPE(rel->r_info),
(void *)rel->r_offset,
(void *)load_ptr(where, sizeof(Elf_Sword)),
obj->strtab + obj->symtab[r_symndx].st_name);
_rtld_error("%s: Unsupported relocation type %ld "
"in non-PLT relocations",
obj->path, (u_long) ELF_R_TYPE(rel->r_info));
return -1;
}
}
return 0;
}
/*
* Process the PLT relocations.
*/
int
reloc_plt(Obj_Entry *obj)
{
const Elf_Rel *rellim;
const Elf_Rel *rel;
rellim = (const Elf_Rel *)((const char *)obj->pltrel + obj->pltrelsize);
for (rel = obj->pltrel; rel < rellim; rel++) {
Elf_Addr *where;
switch (ELF_R_TYPE(rel->r_info)) {
case R_MIPS_JUMP_SLOT:
where = (Elf_Addr *)(obj->relocbase + rel->r_offset);
*where += (Elf_Addr )obj->relocbase;
break;
default:
_rtld_error("Unknown relocation type %u in PLT",
(unsigned int)ELF_R_TYPE(rel->r_info));
return (-1);
}
}
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_Rel *rellim;
const Elf_Rel *rel;
const Elf_Sym *def;
rellim = (const Elf_Rel *)((const char *)obj->pltrel + obj->pltrelsize);
for (rel = obj->pltrel; rel < rellim; rel++) {
Elf_Addr *where;
switch (ELF_R_TYPE(rel->r_info)) {
case R_MIPS_JUMP_SLOT:
def = find_symdef(ELF_R_SYM(rel->r_info), obj,
&defobj, SYMLOOK_IN_PLT | flags, NULL, lockstate);
if (def == NULL) {
dbg("reloc_jmpslots: sym not found");
return (-1);
}
where = (Elf_Addr *)(obj->relocbase + rel->r_offset);
*where = (Elf_Addr)(defobj->relocbase + def->st_value);
break;
default:
_rtld_error("Unknown relocation type %u in PLT",
(unsigned int)ELF_R_TYPE(rel->r_info));
return (-1);
}
}
return (0);
}
int
reloc_iresolve(Obj_Entry *obj __unused,
struct Struct_RtldLockState *lockstate __unused)
{
/* XXX not implemented */
return (0);
}
int
reloc_gnu_ifunc(Obj_Entry *obj __unused, int flags __unused,
struct Struct_RtldLockState *lockstate __unused)
{
/* XXX not implemented */
return (0);
}
Elf_Addr
reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
const Obj_Entry *defobj __unused, const Obj_Entry *obj __unused,
const Elf_Rel *rel)
{
assert(ELF_R_TYPE(rel->r_info) == R_MIPS_JUMP_SLOT);
if (*where != target && !ld_bind_not)
*where = target;
return (target);
}
void
ifunc_init(Elf_Auxinfo aux_info[__min_size(AT_COUNT)] __unused)
{
}
void
pre_init(void)
{
}
void
allocate_initial_tls(Obj_Entry *objs)
{
char *tls;
/*
* 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;
tls = (char *) allocate_tls(objs, NULL, TLS_TCB_SIZE, 8);
sysarch(MIPS_SET_TLS, tls);
}
#ifdef __mips_n64
void *
_mips_get_tls(void)
{
uint64_t _rv;
__asm__ __volatile__ (
".set\tpush\n\t"
".set\tmips64r2\n\t"
"rdhwr\t%0, $29\n\t"
".set\tpop"
: "=r" (_rv));
/*
* XXXSS See 'git show c6be4f4d2d1b71c04de5d3bbb6933ce2dbcdb317'
*
* Remove the offset since this really a request to get the TLS
* pointer via sysarch() (in theory). Of course, this may go away
* once the TLS code is rewritten.
*/
_rv = _rv - TLS_TP_OFFSET - TLS_TCB_SIZE;
return (void *)_rv;
}
#else /* mips 32 */
void *
_mips_get_tls(void)
{
uint32_t _rv;
__asm__ __volatile__ (
".set\tpush\n\t"
".set\tmips32r2\n\t"
"rdhwr\t%0, $29\n\t"
".set\tpop"
: "=r" (_rv));
/*
* XXXSS See 'git show c6be4f4d2d1b71c04de5d3bbb6933ce2dbcdb317'
*
* Remove the offset since this really a request to get the TLS
* pointer via sysarch() (in theory). Of course, this may go away
* once the TLS code is rewritten.
*/
_rv = _rv - TLS_TP_OFFSET - TLS_TCB_SIZE;
return (void *)_rv;
}
#endif /* ! __mips_n64 */
void *
__tls_get_addr(tls_index* ti)
{
Elf_Addr** tls;
char *p;
#ifdef TLS_USE_SYSARCH
sysarch(MIPS_GET_TLS, &tls);
#else
tls = _mips_get_tls();
#endif
p = tls_get_addr_common(tls, ti->ti_module, ti->ti_offset + TLS_DTP_OFFSET);
return (p);
}
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