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Process irelocs for statically linked binaries from crt1 on x86.

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This makes statically linked binaries with ifuncs operational.

Reported and tested by:	mjg
Reviewed by:	emaste, markj
Sponsored by:	The FreeBSD Foundation
Approved by:	re (rgrimes)
Differential revision:	https://reviews.freebsd.org/D17363
This commit is contained in:
Konstantin Belousov 2018-10-13 23:52:55 +00:00
parent c9504239e8
commit bdafb02fcb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=339351
14 changed files with 212 additions and 9 deletions
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1
lib/csu/aarch64/Makefile
View File

@ -7,6 +7,7 @@ OBJS= ${SRCS:N*.h:R:S/$/.o/g}
OBJS+= Scrt1.o gcrt1.o
CFLAGS+= -I${.CURDIR:H}/common \
-I${SRCTOP}/lib/libc/include
CFLAGS+= -DCRT_IRELOC_SUPPRESS
FILES= ${OBJS}
FILESMODE= ${LIBMODE}

4
lib/csu/amd64/Makefile
View File

@ -5,9 +5,9 @@
SRCS= crt1.c crti.S crtn.S
OBJS= ${SRCS:N*.h:R:S/$/.o/g}
OBJS+= Scrt1.o gcrt1.o
CFLAGS+= -I${.CURDIR:H}/common \
CFLAGS+= -I${.CURDIR} -I${.CURDIR:H}/common \
-I${SRCTOP}/lib/libc/include
CFLAGS+= -fno-omit-frame-pointer
CFLAGS+= -fno-omit-frame-pointer -DCRT_IRELOC_RELA
FILES= ${OBJS}
FILESMODE= ${LIBMODE}

6
lib/csu/amd64/crt1.c
View File

@ -59,10 +59,12 @@ _start(char **ap, void (*cleanup)(void))
env = ap + 2 + argc;
handle_argv(argc, argv, env);
if (&_DYNAMIC != NULL)
if (&_DYNAMIC != NULL) {
atexit(cleanup);
else
} else {
process_irelocs();
_init_tls();
}
#ifdef GCRT
atexit(_mcleanup);

66
lib/csu/amd64/reloc.c Normal file
View File

@ -0,0 +1,66 @@
/*-
* Copyright (c) 2018 The FreeBSD Foundation
*
* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
* under sponsorship from the FreeBSD Foundation.
*
* 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 <machine/specialreg.h>
#include <machine/cpufunc.h>
static void
crt1_handle_rela(const Elf_Rela *r)
{
Elf_Addr *ptr, *where, target;
u_int p[4];
uint32_t cpu_feature, cpu_feature2;
uint32_t cpu_stdext_feature, cpu_stdext_feature2;
do_cpuid(1, p);
cpu_feature = p[3];
cpu_feature2 = p[2];
do_cpuid(0, p);
if (p[0] >= 7) {
cpuid_count(7, 0, p);
cpu_stdext_feature = p[1];
cpu_stdext_feature2 = p[2];
} else {
cpu_stdext_feature = 0;
cpu_stdext_feature2 = 0;
}
switch (ELF_R_TYPE(r->r_info)) {
case R_X86_64_IRELATIVE:
ptr = (Elf_Addr *)r->r_addend;
where = (Elf_Addr *)r->r_offset;
target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t,
uint32_t))ptr)(cpu_feature, cpu_feature2,
cpu_stdext_feature, cpu_stdext_feature2);
*where = target;
break;
}
}

1
lib/csu/arm/Makefile
View File

@ -7,6 +7,7 @@ OBJS= ${SRCS:N*.h:R:S/$/.o/g}
OBJS+= Scrt1.o gcrt1.o
CFLAGS+= -I${.CURDIR:H}/common \
-I${SRCTOP}/lib/libc/include
CFLAGS+= -DCRT_IRELOC_SUPPRESS
STATIC_CFLAGS+= -mlong-calls
FILES= ${OBJS}

40
lib/csu/common/ignore_init.c
View File

@ -2,7 +2,10 @@
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright 2012 Konstantin Belousov <kib@FreeBSD.org>
* All rights reserved.
* Copyright (c) 2018 The FreeBSD Foundation
*
* Parts of this software was developed by Konstantin Belousov
* <kib@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -29,7 +32,9 @@
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/elf.h>
#include <sys/elf_common.h>
#include "notes.h"
extern int main(int, char **, char **);
@ -46,6 +51,39 @@ extern void _init(void) __hidden;
extern int _DYNAMIC;
#pragma weak _DYNAMIC
#if defined(CRT_IRELOC_RELA)
extern const Elf_Rela __rela_iplt_start[] __weak_symbol __hidden;
extern const Elf_Rela __rela_iplt_end[] __weak_symbol __hidden;
#include "reloc.c"
static void
process_irelocs(void)
{
const Elf_Rela *r;
for (r = &__rela_iplt_start[0]; r < &__rela_iplt_end[0]; r++)
crt1_handle_rela(r);
}
#elif defined(CRT_IRELOC_REL)
extern const Elf_Rel __rel_iplt_start[] __weak_symbol __hidden;
extern const Elf_Rel __rel_iplt_end[] __weak_symbol __hidden;
#include "reloc.c"
static void
process_irelocs(void)
{
const Elf_Rel *r;
for (r = &__rel_iplt_start[0]; r < &__rel_iplt_end[0]; r++)
crt1_handle_rel(r);
}
#elif defined(CRT_IRELOC_SUPPRESS)
#else
#error "Define platform reloc type"
#endif
char **environ;
const char *__progname = "";

3
lib/csu/i386/Makefile
View File

@ -5,8 +5,9 @@
SRCS= crti.S crtn.S
OBJS= ${SRCS:N*.h:R:S/$/.o/g}
OBJS+= gcrt1.o crt1.o Scrt1.o
CFLAGS+= -I${.CURDIR:H}/common \
CFLAGS+= -I${.CURDIR} -I${.CURDIR:H}/common \
-I${SRCTOP}/lib/libc/include
CFLAGS+= -DCRT_IRELOC_REL
FILES= ${OBJS}
FILESMODE= ${LIBMODE}

6
lib/csu/i386/crt1_c.c
View File

@ -56,10 +56,12 @@ _start1(fptr cleanup, int argc, char *argv[])
env = argv + argc + 1;
handle_argv(argc, argv, env);
if (&_DYNAMIC != NULL)
if (&_DYNAMIC != NULL) {
atexit(cleanup);
else
} else {
process_irelocs();
_init_tls();
}
#ifdef GCRT
atexit(_mcleanup);

88
lib/csu/i386/reloc.c Normal file
View File

@ -0,0 +1,88 @@
/*-
* Copyright (c) 2018 The FreeBSD Foundation
*
* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
* under sponsorship from the FreeBSD Foundation.
*
* 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 <machine/specialreg.h>
#include <machine/cpufunc.h>
static void
crt1_handle_rel(const Elf_Rel *r)
{
Elf_Addr *where, target;
u_int cpuid_supported, p[4];
uint32_t cpu_feature, cpu_feature2;
uint32_t cpu_stdext_feature, cpu_stdext_feature2;
__asm __volatile(
" pushfl\n"
" popl %%eax\n"
" movl %%eax,%%ecx\n"
" xorl $0x200000,%%eax\n"
" pushl %%eax\n"
" popfl\n"
" pushfl\n"
" popl %%eax\n"
" xorl %%eax,%%ecx\n"
" je 1f\n"
" movl $1,%0\n"
" jmp 2f\n"
"1: movl $0,%0\n"
"2:\n"
: "=r" (cpuid_supported) : : "eax", "ecx", "cc");
if (cpuid_supported) {
do_cpuid(1, p);
cpu_feature = p[3];
cpu_feature2 = p[2];
do_cpuid(0, p);
if (p[0] >= 7) {
cpuid_count(7, 0, p);
cpu_stdext_feature = p[1];
cpu_stdext_feature2 = p[2];
} else {
cpu_stdext_feature = 0;
cpu_stdext_feature2 = 0;
}
} else {
cpu_feature = 0;
cpu_feature2 = 0;
cpu_stdext_feature = 0;
cpu_stdext_feature2 = 0;
}
switch (ELF_R_TYPE(r->r_info)) {
case R_386_IRELATIVE:
where = (Elf_Addr *)r->r_offset;
target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t,
uint32_t))*where)(cpu_feature, cpu_feature2,
cpu_stdext_feature, cpu_stdext_feature2);
*where = target;
break;
}
}

1
lib/csu/mips/Makefile
View File

@ -7,6 +7,7 @@ OBJS= ${SRCS:N*.h:R:S/$/.o/g}
OBJS+= Scrt1.o gcrt1.o
CFLAGS+= -I${.CURDIR:H}/common \
-I${SRCTOP}/lib/libc/include
CFLAGS+= -DCRT_IRELOC_SUPPRESS
FILES= ${OBJS}
FILESMODE= ${LIBMODE}

1
lib/csu/powerpc/Makefile
View File

@ -7,6 +7,7 @@ OBJS= ${SRCS:N*.h:R:S/$/.o/g}
OBJS+= Scrt1.o gcrt1.o
CFLAGS+= -I${.CURDIR:H}/common \
-I${SRCTOP}/lib/libc/include
CFLAGS+= -DCRT_IRELOC_SUPPRESS
FILES= ${OBJS}
FILESMODE= ${LIBMODE}

2
lib/csu/powerpc64/Makefile
View File

@ -7,7 +7,7 @@ OBJS= ${SRCS:N*.h:R:S/$/.o/g}
OBJS+= Scrt1.o gcrt1.o
CFLAGS+= -I${.CURDIR:H}/common \
-I${SRCTOP}/lib/libc/include \
-mlongcall
-mlongcall -DCRT_IRELOC_SUPPRESS
FILES= ${OBJS}
FILESMODE= ${LIBMODE}

1
lib/csu/riscv/Makefile
View File

@ -7,6 +7,7 @@ OBJS= ${SRCS:N*.h:R:S/$/.o/g}
OBJS+= Scrt1.o gcrt1.o
CFLAGS+= -I${.CURDIR:H}/common \
-I${SRCTOP}/lib/libc/include
CFLAGS+= -DCRT_IRELOC_SUPPRESS
FILES= ${OBJS}
FILESMODE= ${LIBMODE}

1
lib/csu/sparc64/Makefile
View File

@ -7,6 +7,7 @@ OBJS= ${SRCS:N*.h:R:S/$/.o/g}
OBJS+= Scrt1.o gcrt1.o
CFLAGS+= -I${.CURDIR:H}/common \
-I${SRCTOP}/lib/libc/include
CFLAGS+= -DCRT_IRELOC_SUPPRESS
FILES= ${OBJS}
FILESMODE= ${LIBMODE}