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Add support for TLS in statically linked programs.

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This commit is contained in:
Doug Rabson 2004-08-15 16:18:52 +00:00
parent aafa519a46
commit ccd13c49b5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=133754
21 changed files with 490 additions and 8 deletions
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2
lib/csu/alpha/crt1.c
View File

@ -93,6 +93,8 @@ _start(char **ap, void (*cleanup)(void), struct Struct_Obj_Entry *obj __unused,
if (&_DYNAMIC != NULL)
atexit(cleanup);
else
_init_tls();
#ifdef GCRT
atexit(_mcleanup);

2
lib/csu/amd64/crt1.c
View File

@ -77,6 +77,8 @@ _start(char **ap, void (*cleanup)(void))
if (&_DYNAMIC != NULL)
atexit(cleanup);
else
_init_tls();
#ifdef GCRT
atexit(_mcleanup);

2
lib/csu/arm/crt1.c
View File

@ -116,6 +116,8 @@ __start(int argc, char **argv, char **env,
if (&_DYNAMIC != NULL)
atexit(cleanup);
else
_init_tls();
#ifdef GCRT
atexit(_mcleanup);

2
lib/csu/i386-elf/crt1.c
View File

@ -92,6 +92,8 @@ _start(char *ap, ...)
if (&_DYNAMIC != NULL)
atexit(cleanup);
else
_init_tls();
#ifdef GCRT
atexit(_mcleanup);

5
lib/csu/ia64/crt1.S
View File

@ -107,6 +107,11 @@ _start:
(p7) br.call.sptk b0=atexit
;;
}
{ .mfb
nop 0
nop 0
br.call.sptk b0=_init_tls
}
#ifdef GCRT
{ .mmi
mov gp=GP

2
lib/csu/powerpc/crt1.c
View File

@ -100,6 +100,8 @@ _start(int argc, char **argv, char **env,
if (&_DYNAMIC != NULL)
atexit(cleanup);
else
_init_tls();
#ifdef GCRT
atexit(_mcleanup);

2
lib/csu/sparc64/crt1.c
View File

@ -102,6 +102,8 @@ _start(char **ap, void (*cleanup)(void), struct Struct_Obj_Entry *obj __unused,
if (&_DYNAMIC != NULL)
atexit(cleanup);
else
_init_tls();
#ifdef GCRT
atexit(_mcleanup);

2
lib/libc/alpha/gen/Makefile.inc
View File

@ -1,6 +1,6 @@
# $FreeBSD$
SRCS+= _setjmp.S fabs.S infinity.c ldexp.c modf.c setjmp.S
SRCS+= _setjmp.S _set_tp.c fabs.S infinity.c ldexp.c modf.c setjmp.S
SRCS+= flt_rounds.c fpgetmask.c fpgetround.c fpgetsticky.c fpsetmask.c \
fpsetround.c fpsetsticky.c

37
lib/libc/alpha/gen/_set_tp.c Normal file
View File

@ -0,0 +1,37 @@
/*-
* Copyright (c) 2004 Doug Rabson
* 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.
*
* 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.
*
* $FreeBSD$
*/
#include <stdint.h>
#include <machine/alpha_cpu.h>
void
_set_tp(void *tp)
{
alpha_pal_wrunique((uintptr_t) tp);
}

2
lib/libc/amd64/gen/Makefile.inc
View File

@ -1,7 +1,7 @@
# @(#)Makefile.inc 8.1 (Berkeley) 6/4/93
# $FreeBSD$
SRCS+= _setjmp.S rfork_thread.S setjmp.S sigsetjmp.S \
SRCS+= _setjmp.S _set_tp.c rfork_thread.S setjmp.S sigsetjmp.S \
fabs.S modf.S \
infinity.c ldexp.c makecontext.c signalcontext.c \
flt_rounds.c fpgetmask.c fpsetmask.c fpgetprec.c fpsetprec.c \

38
lib/libc/amd64/gen/_set_tp.c Normal file
View File

@ -0,0 +1,38 @@
/*-
* Copyright (c) 2004 Doug Rabson
* 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.
*
* 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.
*
* $FreeBSD$
*/
#include <string.h>
#include <stdint.h>
#include <machine/sysarch.h>
void
_set_tp(void *tp)
{
amd64_set_fsbase(tp);
}

227
lib/libc/gen/tls.c
View File

@ -32,7 +32,35 @@
* runtime from ld-elf.so.1.
*/
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <elf.h>
#include <assert.h>
#include "libc_private.h"
/* XXX not sure what variants to use for arm. */
#if defined(__ia64__) || defined(__alpha__) || defined(__powerpc__)
#define TLS_VARIANT_I
#endif
#if defined(__i386__) || defined(__amd64__) || defined(__sparc64__)
#define TLS_VARIANT_II
#endif
#ifndef PIC
#define round(size, align) \
(((size) + (align) - 1) & ~((align) - 1))
static size_t tls_static_space;
static size_t tls_init_size;
#ifdef TLS_VARIANT_I
static size_t tls_init_offset;
#endif
static void *tls_init;
void _rtld_free_tls(void *tcb, size_t tcbsize, size_t tcbalign);
#endif
#ifdef __i386__
@ -55,15 +83,210 @@ __tls_get_addr()
return (0);
}
#pragma weak _rtld_allocate_tls
#ifdef TLS_VARIANT_I
void
_rtld_free_tls(void *tls, size_t tcbsize, size_t tcbalign)
{
#ifndef PIC
Elf_Addr* dtv;
dtv = ((Elf_Addr**)tls)[0];
free(tls);
free(dtv);
#endif
}
/*
* Allocate Static TLS using the Variant I method.
*/
void *
_rtld_allocate_tls(void *oldtls, size_t tcbsize, size_t tcbalign)
{
#ifndef PIC
size_t size;
char *tls;
Elf_Addr *dtv;
size = tls_static_space;
tls = malloc(size);
dtv = malloc(3 * sizeof(Elf_Addr));
*(Elf_Addr**) tls = dtv;
dtv[0] = 1;
dtv[1] = 1;
dtv[2] = (Elf_Addr)(tls + tls_init_offset);
if (oldtls) {
/*
* Copy the static TLS block over whole.
*/
memcpy(tls + tls_init_offset,
(char*) oldtls + tls_init_offset,
tls_static_space - tls_init_offset);
/*
* We assume that this block was the one we created with
* allocate_initial_tls().
*/
_rtld_free_tls(oldtls, 2*sizeof(Elf_Addr), sizeof(Elf_Addr));
} else {
memcpy(tls + tls_init_offset, tls_init, tls_init_size);
memset(tls + tls_init_offset + tls_init_size,
0, tls_static_space - tls_init_size);
}
return tls;
#else
return (0);
#endif
}
#endif
#ifdef TLS_VARIANT_II
/*
* Free Static TLS using the Variant II method.
*/
#pragma weak _rtld_free_tls
void
_rtld_free_tls(void *tcb, size_t tcbsize, size_t tcbalign)
{
#ifndef PIC
size_t size;
Elf_Addr* dtv;
Elf_Addr tlsstart, tlsend;
/*
* Figure out the size of the initial TLS block so that we can
* find stuff which ___tls_get_addr() allocated dynamically.
*/
size = round(tls_static_space, tcbalign);
dtv = ((Elf_Addr**)tcb)[1];
tlsend = (Elf_Addr) tcb;
tlsstart = tlsend - size;
free((void*) tlsstart);
free(dtv);
#endif
}
#pragma weak _rtld_allocate_tls
/*
* Allocate Static TLS using the Variant II method.
*/
void *
_rtld_allocate_tls(void *oldtls, size_t tcbsize, size_t tcbalign)
{
#ifndef PIC
size_t size;
char *tls;
Elf_Addr *dtv;
Elf_Addr segbase, oldsegbase;
size = round(tls_static_space, tcbalign);
assert(tcbsize >= 2*sizeof(Elf_Addr));
tls = malloc(size + tcbsize);
dtv = malloc(3 * sizeof(Elf_Addr));
segbase = (Elf_Addr)(tls + size);
((Elf_Addr*)segbase)[0] = segbase;
((Elf_Addr*)segbase)[1] = (Elf_Addr) dtv;
dtv[0] = 1;
dtv[1] = 1;
dtv[2] = segbase - tls_static_space;
if (oldtls) {
/*
* Copy the static TLS block over whole.
*/
oldsegbase = (Elf_Addr) oldtls;
memcpy((void *)(segbase - tls_static_space),
(const void *)(oldsegbase - tls_static_space),
tls_static_space);
/*
* We assume that this block was the one we created with
* allocate_initial_tls().
*/
_rtld_free_tls(oldtls, 2*sizeof(Elf_Addr), sizeof(Elf_Addr));
} else {
memcpy((void *)(segbase - tls_static_space),
tls_init, tls_init_size);
memset((void *)(segbase - tls_static_space + tls_init_size),
0, tls_static_space - tls_init_size);
}
return (void*) segbase;
#else
return (0);
#endif
}
#endif
void
_init_tls()
{
#ifndef PIC
extern char **environ;
Elf_Addr *sp;
Elf_Auxinfo *aux, *auxp;
Elf_Phdr *phdr;
size_t phent, phnum;
int i;
sp = (Elf_Addr *) environ;
while (*sp++ != 0)
;
aux = (Elf_Auxinfo *) sp;
phdr = 0;
phent = phnum = 0;
for (auxp = aux; auxp->a_type != AT_NULL; auxp++) {
switch (auxp->a_type) {
case AT_PHDR:
phdr = auxp->a_un.a_ptr;
break;
case AT_PHENT:
phent = auxp->a_un.a_val;
break;
case AT_PHNUM:
phnum = auxp->a_un.a_val;
break;
}
}
if (phdr == 0 || phent != sizeof(Elf_Phdr) || phnum == 0)
return;
for (i = 0; i < phnum; i++) {
if (phdr[i].p_type == PT_TLS) {
#ifdef TLS_VARIANT_I
tls_static_space = round(2*sizeof(Elf_Addr),
phdr[i].p_align) + phdr[i].p_memsz;
tls_init_offset = round(2*sizeof(Elf_Addr),
phdr[i].p_align);
#else
tls_static_space = round(phdr[i].p_memsz,
phdr[i].p_align);
#endif
tls_init_size = phdr[i].p_filesz;
tls_init = (void*) phdr[i].p_vaddr;
}
}
if (tls_static_space > 0) {
void* tls;
tls = _rtld_allocate_tls(NULL, 2*sizeof(Elf_Addr),
sizeof(Elf_Addr));
_set_tp(tls);
}
#endif
}

2
lib/libc/i386/gen/Makefile.inc
View File

@ -1,6 +1,6 @@
# @(#)Makefile.inc 8.1 (Berkeley) 6/4/93
# $FreeBSD$
SRCS+= _ctx_start.S _setjmp.S alloca.S fabs.S \
SRCS+= _ctx_start.S _setjmp.S _set_tp.c alloca.S fabs.S \
flt_rounds.c infinity.c ldexp.c makecontext.c modf.S \
rfork_thread.S setjmp.S signalcontext.c sigsetjmp.S

52
lib/libc/i386/gen/_set_tp.c Normal file
View File

@ -0,0 +1,52 @@
/*-
* Copyright (c) 2004 Doug Rabson
* 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.
*
* 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.
*
* $FreeBSD$
*/
#include <string.h>
#include <stdint.h>
#include <machine/segments.h>
#include <machine/sysarch.h>
void
_set_tp(void *tp)
{
union descriptor ldt;
int sel;
memset(&ldt, 0, sizeof(ldt));
ldt.sd.sd_lolimit = 0xffff; /* 4G limit */
ldt.sd.sd_lobase = ((uintptr_t)tp) & 0xffffff;
ldt.sd.sd_type = SDT_MEMRWA;
ldt.sd.sd_dpl = SEL_UPL;
ldt.sd.sd_p = 1; /* present */
ldt.sd.sd_hilimit = 0xf; /* 4G limit */
ldt.sd.sd_def32 = 1; /* 32 bit */
ldt.sd.sd_gran = 1; /* limit in pages */
ldt.sd.sd_hibase = (((uintptr_t)tp) >> 24) & 0xff;
sel = i386_set_ldt(LDT_AUTO_ALLOC, &ldt, 1);
__asm __volatile("movl %0,%%gs" : : "rm" ((sel << 3) | 7));
}

2
lib/libc/ia64/gen/Makefile.inc
View File

@ -2,7 +2,7 @@
SRCS+= __divdf3.S __divdi3.S __divsf3.S __divsi3.S __moddi3.S __modsi3.S \
__udivdi3.S __udivsi3.S __umoddi3.S __umodsi3.S _setjmp.S fabs.S \
flt_rounds.c fpgetmask.c fpgetround.c fpsetmask.c \
_set_tp.c flt_rounds.c fpgetmask.c fpgetround.c fpsetmask.c \
fpsetround.c infinity.c \
ldexp.c makecontext.c modf.c setjmp.S signalcontext.c sigsetjmp.S

35
lib/libc/ia64/gen/_set_tp.c Normal file
View File

@ -0,0 +1,35 @@
/*-
* Copyright (c) 2004 Doug Rabson
* 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.
*
* 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.
*
* $FreeBSD$
*/
void
_set_tp(void *tpval)
{
register void* tp __asm__("r13");
tp = tpval;
}

9
lib/libc/include/libc_private.h
View File

@ -113,6 +113,15 @@ extern pthread_func_entry_t __thr_jtable[];
int _yp_check(char **);
#endif
/*
* Initialise TLS for static programs
*/
void _init_tls(void);
/*
* Set the TLS thread pointer
*/
void _set_tp(void *tp);
/*
* This is a pointer in the C run-time startup code. It is used

3
lib/libc/powerpc/gen/Makefile.inc
View File

@ -3,6 +3,7 @@
SRCS += _ctx_start.S fabs.S flt_rounds.c fpgetmask.c fpgetround.c \
fpgetsticky.c fpsetmask.c fpsetround.c fpsetsticky.c \
infinity.c ldexp.c makecontext.c modf.c _setjmp.S \
setjmp.S sigsetjmp.S signalcontext.c syncicache.c
setjmp.S sigsetjmp.S signalcontext.c syncicache.c \
_set_tp.c

35
lib/libc/powerpc/gen/_set_tp.c Normal file
View File

@ -0,0 +1,35 @@
/*-
* Copyright (c) 2004 Doug Rabson
* 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.
*
* 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.
*
* $FreeBSD$
*/
void
_set_tp(void *tpval)
{
register void* tp __asm__("r2");
tp = (char*) tpval + 0x7008;
}

2
lib/libc/sparc64/gen/Makefile.inc
View File

@ -3,4 +3,4 @@
SRCS+= _ctx_start.S _setjmp.S fabs.S fixunsdfsi.S flt_rounds.c fpgetmask.c \
fpgetround.c fpgetsticky.c fpsetmask.c fpsetround.c fpsetsticky.c \
infinity.c ldexp.c makecontext.c modf.S \
signalcontext.c setjmp.S sigsetjmp.S
signalcontext.c setjmp.S sigsetjmp.S _set_tp.c

35
lib/libc/sparc64/gen/_set_tp.c Normal file
View File

@ -0,0 +1,35 @@
/*-
* Copyright (c) 2004 Doug Rabson
* 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.
*
* 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.
*
* $FreeBSD$
*/
void
_set_tp(void *tpval)
{
register void* tp __asm__("%g7");
tp = tpval;
}