1GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
2# Local configure fragment for sysdeps/x86.
3
4if test $enable_cet != no; then
5  # Check if CET can be enabled.
6  AC_CACHE_CHECK(whether CET can be enabled,
7		 libc_cv_x86_cet_available, [dnl
8cat > conftest.c <<EOF
9#if !defined __CET__ || __CET__ != 3
10# error CET isn't available.
11#endif
12EOF
13		 if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS -fcf-protection -include cet.h conftest.c 1>&AS_MESSAGE_LOG_FD); then
14		   libc_cv_x86_cet_available=yes
15		 else
16		   libc_cv_x86_cet_available=no
17		 fi
18		 rm -rf conftest*])
19  if test $libc_cv_x86_cet_available != yes; then
20    AC_MSG_ERROR([$CC doesn't support CET])
21  fi
22fi
23if test $enable_cet != no; then
24  # Check if assembler supports CET.
25  AC_CACHE_CHECK(whether $AS supports CET,
26		 libc_cv_x86_cet_as, [dnl
27cat > conftest.s <<EOF
28	incsspd %ecx
29EOF
30		 if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s -o conftest.o 1>&AS_MESSAGE_LOG_FD); then
31		   libc_cv_x86_cet_as=yes
32		 else
33		   libc_cv_x86_cet_as=no
34		 fi
35		 rm -rf conftest*])
36  if test $libc_cv_x86_cet_as = no; then
37    AC_MSG_ERROR([$AS doesn't support CET])
38  fi
39fi
40if test $enable_cet = yes; then
41  AC_DEFINE(DEFAULT_DL_X86_CET_CONTROL, cet_elf_property)
42elif test $enable_cet = permissive; then
43  AC_DEFINE(DEFAULT_DL_X86_CET_CONTROL, cet_permissive)
44fi
45LIBC_CONFIG_VAR([enable-cet], [$enable_cet])
46
47# Check if linker supports x86 ISA level.
48AC_CACHE_CHECK([for linker x86 ISA level support],
49	       libc_cv_include_x86_isa_level, [dnl
50cat > conftest1.S <<EOF
51#ifdef __LP64__
52# define P2ALIGN 3
53#else
54# define P2ALIGN 2
55#endif
56	.section ".note.gnu.property", "a"
57	.p2align P2ALIGN
58	.long 1f - 0f		/* name length.  */
59	.long 4f - 1f		/* data length.  */
60	/* NT_GNU_PROPERTY_TYPE_0 */
61	.long 5			/* note type.  */
620:
63	.asciz "GNU"		/* vendor name.  */
641:
65	.p2align P2ALIGN
66	/* GNU_PROPERTY_X86_ISA_1_NEEDED */
67	.long 0xc0008002	/* pr_type.  */
68	.long 3f - 2f		/* pr_datasz.  */
692:
70	.long 0x1
713:
72	.p2align P2ALIGN
734:
74EOF
75cat > conftest2.S <<EOF
76#ifdef __LP64__
77# define P2ALIGN 3
78#else
79# define P2ALIGN 2
80#endif
81	.section ".note.gnu.property", "a"
82	.p2align P2ALIGN
83	.long 1f - 0f		/* name length.  */
84	.long 4f - 1f		/* data length.  */
85	/* NT_GNU_PROPERTY_TYPE_0 */
86	.long 5			/* note type.  */
870:
88	.asciz "GNU"		/* vendor name.  */
891:
90	.p2align P2ALIGN
91	/* GNU_PROPERTY_X86_ISA_1_NEEDED */
92	.long 0xc0008002	/* pr_type.  */
93	.long 3f - 2f		/* pr_datasz.  */
942:
95	.long 0x2
963:
97	.p2align P2ALIGN
984:
99EOF
100libc_cv_include_x86_isa_level=no
101if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -nostartfiles -nostdlib -r -o conftest conftest1.S conftest2.S); then
102  count=`LC_ALL=C $READELF -n conftest | grep NT_GNU_PROPERTY_TYPE_0 | wc -l`
103  if test "$count" = 1; then
104    libc_cv_include_x86_isa_level=yes
105  fi
106fi
107rm -f conftest*])
108if test $libc_cv_include_x86_isa_level = yes; then
109  AC_DEFINE(INCLUDE_X86_ISA_LEVEL)
110  AC_CACHE_CHECK([for LAHF/SAHF instruction support],
111		 libc_cv_have_x86_lahf_sahf, [dnl
112    libc_cv_have_x86_lahf_sahf=no
113    if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -fverbose-asm -S -o - -x c /dev/null) | grep -qE '(-msahf\b|-march=x86-64-v)'; then
114      libc_cv_have_x86_lahf_sahf=yes
115    fi])
116  if test $libc_cv_have_x86_lahf_sahf = yes; then
117    AC_DEFINE(HAVE_X86_LAHF_SAHF)
118  fi
119  AC_CACHE_CHECK([for MOVBE instruction support],
120		 libc_cv_have_x86_movbe, [dnl
121    libc_cv_have_x86_movbe=no
122    if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -fverbose-asm -S -o - -x c /dev/null) | grep -qE '(-mmovbe\b|-march=x86-64-v(@<:@3-9@:>@|@<:@1-9@:>@@<:@0-9@:>@))'; then
123      libc_cv_have_x86_movbe=yes
124    fi])
125  if test $libc_cv_have_x86_movbe = yes; then
126    AC_DEFINE(HAVE_X86_MOVBE)
127  fi
128fi
129LIBC_CONFIG_VAR([enable-x86-isa-level], [$libc_cv_include_x86_isa_level])
130
131dnl Static PIE is supported.
132AC_DEFINE(SUPPORT_STATIC_PIE)
133