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elf: Remove Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT)

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Intel MPX failed to gain wide adoption and has been deprecated for a
while. GCC 9.1 removed Intel MPX support. Linux kernel removed MPX in
2019.

This patch removes the support code from the dynamic loader.
This commit is contained in:
Fangrui Song 2021-10-10 22:32:12 -07:00
parent 5d26d12f4a
commit e3d3fb2f6a
12 changed files with 6 additions and 184 deletions
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2
NEWS
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@ -61,6 +61,8 @@ Deprecated and removed features, and other changes affecting compatibility:
when audit modules or dlmopen are used.
* Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
Changes to build and runtime requirements:
[Add changes to build and runtime requirements here]

3
config.h.in
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@ -84,9 +84,6 @@
/* Define if assembler supports arch13 instructions on S390. */
#undef HAVE_S390_ARCH13_ASM_SUPPORT
/* Define if assembler supports Intel MPX. */
#undef HAVE_MPX_SUPPORT
/* Define if the compiler\'s exception support is based on libunwind. */
#undef HAVE_CC_WITH_LIBUNWIND

27
sysdeps/i386/configure vendored
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@ -83,33 +83,6 @@ $as_echo "$libc_cv_ld_static_pie" >&6; }
fi
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for Intel MPX support" >&5
$as_echo_n "checking for Intel MPX support... " >&6; }
if ${libc_cv_asm_mpx+:} false; then :
$as_echo_n "(cached) " >&6
else
cat > conftest.s <<\EOF
bndmov %bnd0,(%esp)
EOF
if { ac_try='${CC-cc} -c $ASFLAGS conftest.s 1>&5'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }; then
libc_cv_asm_mpx=yes
else
libc_cv_asm_mpx=no
fi
rm -f conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_mpx" >&5
$as_echo "$libc_cv_asm_mpx" >&6; }
if test $libc_cv_asm_mpx = yes; then
$as_echo "#define HAVE_MPX_SUPPORT 1" >>confdefs.h
fi
$as_echo "#define PI_STATIC_AND_HIDDEN 1" >>confdefs.h

15
sysdeps/i386/configure.ac
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@ -53,21 +53,6 @@ rm -f conftest*])
fi
fi
dnl Check whether asm supports Intel MPX
AC_CACHE_CHECK(for Intel MPX support, libc_cv_asm_mpx, [dnl
cat > conftest.s <<\EOF
bndmov %bnd0,(%esp)
EOF
if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_asm_mpx=yes
else
libc_cv_asm_mpx=no
fi
rm -f conftest*])
if test $libc_cv_asm_mpx = yes; then
AC_DEFINE(HAVE_MPX_SUPPORT)
fi
dnl It is always possible to access static and hidden symbols in an
dnl position independent way.
AC_DEFINE(PI_STATIC_AND_HIDDEN)

21
sysdeps/i386/dl-trampoline.S
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@ -19,12 +19,6 @@
#include <sysdep.h>
#include <link-defines.h>
#ifdef HAVE_MPX_SUPPORT
# define PRESERVE_BND_REGS_PREFIX bnd
#else
# define PRESERVE_BND_REGS_PREFIX .byte 0xf2
#endif
.text
.globl _dl_runtime_resolve
.type _dl_runtime_resolve, @function
@ -250,13 +244,6 @@ _dl_runtime_profile:
movl %edx, LRV_EDX_OFFSET(%esp)
fstpt LRV_ST0_OFFSET(%esp)
fstpt LRV_ST1_OFFSET(%esp)
#ifdef HAVE_MPX_SUPPORT
bndmov %bnd0, LRV_BND0_OFFSET(%esp)
bndmov %bnd1, LRV_BND1_OFFSET(%esp)
#else
.byte 0x66,0x0f,0x1b,0x44,0x24,LRV_BND0_OFFSET
.byte 0x66,0x0f,0x1b,0x4c,0x24,LRV_BND1_OFFSET
#endif
pushl %esp
cfi_adjust_cfa_offset (4)
# Address of La_i86_regs area.
@ -270,17 +257,9 @@ _dl_runtime_profile:
movl LRV_EDX_OFFSET(%esp), %edx
fldt LRV_ST1_OFFSET(%esp)
fldt LRV_ST0_OFFSET(%esp)
#ifdef HAVE_MPX_SUPPORT
bndmov LRV_BND0_OFFSET(%esp), %bnd0
bndmov LRV_BND1_OFFSET(%esp), %bnd1
#else
.byte 0x66,0x0f,0x1a,0x44,0x24,LRV_BND0_OFFSET
.byte 0x66,0x0f,0x1a,0x4c,0x24,LRV_BND1_OFFSET
#endif
# Restore stack before return.
addl $(LRV_SIZE + 4 + LR_SIZE + 4), %esp
cfi_adjust_cfa_offset (-(LRV_SIZE + 4 + LR_SIZE + 4))
PRESERVE_BND_REGS_PREFIX
ret
cfi_endproc
.size _dl_runtime_profile, .-_dl_runtime_profile

2
sysdeps/i386/link-defines.sym
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@ -16,5 +16,3 @@ LRV_EAX_OFFSET offsetof (struct La_i86_retval, lrv_eax)
LRV_EDX_OFFSET offsetof (struct La_i86_retval, lrv_edx)
LRV_ST0_OFFSET offsetof (struct La_i86_retval, lrv_st0)
LRV_ST1_OFFSET offsetof (struct La_i86_retval, lrv_st1)
LRV_BND0_OFFSET offsetof (struct La_i86_retval, lrv_bnd0)
LRV_BND1_OFFSET offsetof (struct La_i86_retval, lrv_bnd1)

8
sysdeps/x86/bits/link.h
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@ -38,8 +38,8 @@ typedef struct La_i86_retval
uint32_t lrv_edx;
long double lrv_st0;
long double lrv_st1;
uint64_t lrv_bnd0;
uint64_t lrv_bnd1;
uint64_t unused1;
uint64_t unused2;
} La_i86_retval;
@ -112,8 +112,8 @@ typedef struct La_x86_64_retval
La_x86_64_vector lrv_vector0;
La_x86_64_vector lrv_vector1;
#ifndef __ILP32__
__int128_t lrv_bnd0;
__int128_t lrv_bnd1;
__int128_t unused1;
__int128_t unused2;
#endif
} La_x86_64_retval;

27
sysdeps/x86_64/configure vendored
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@ -23,33 +23,6 @@ $as_echo "$libc_cv_cc_mprefer_vector_width" >&6; }
config_vars="$config_vars
config-cflags-mprefer-vector-width = $libc_cv_cc_mprefer_vector_width"
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for Intel MPX support" >&5
$as_echo_n "checking for Intel MPX support... " >&6; }
if ${libc_cv_asm_mpx+:} false; then :
$as_echo_n "(cached) " >&6
else
cat > conftest.s <<\EOF
bndmov %bnd0,(%rsp)
EOF
if { ac_try='${CC-cc} -c $ASFLAGS conftest.s 1>&5'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }; then
libc_cv_asm_mpx=yes
else
libc_cv_asm_mpx=no
fi
rm -f conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_mpx" >&5
$as_echo "$libc_cv_asm_mpx" >&6; }
if test $libc_cv_asm_mpx = yes; then
$as_echo "#define HAVE_MPX_SUPPORT 1" >>confdefs.h
fi
if test x"$build_mathvec" = xnotset; then
build_mathvec=yes
fi

15
sysdeps/x86_64/configure.ac
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@ -10,21 +10,6 @@ LIBC_TRY_CC_OPTION([-mprefer-vector-width=128],
LIBC_CONFIG_VAR([config-cflags-mprefer-vector-width],
[$libc_cv_cc_mprefer_vector_width])
dnl Check whether asm supports Intel MPX
AC_CACHE_CHECK(for Intel MPX support, libc_cv_asm_mpx, [dnl
cat > conftest.s <<\EOF
bndmov %bnd0,(%rsp)
EOF
if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_asm_mpx=yes
else
libc_cv_asm_mpx=no
fi
rm -f conftest*])
if test $libc_cv_asm_mpx = yes; then
AC_DEFINE(HAVE_MPX_SUPPORT)
fi
if test x"$build_mathvec" = xnotset; then
build_mathvec=yes
fi

9
sysdeps/x86_64/dl-trampoline.S
View File

@ -42,15 +42,6 @@
/* Area on stack to save and restore registers used for parameter
passing when calling _dl_fixup. */
#ifdef __ILP32__
# define PRESERVE_BND_REGS_PREFIX
#else
# ifdef HAVE_MPX_SUPPORT
# define PRESERVE_BND_REGS_PREFIX bnd
# else
# define PRESERVE_BND_REGS_PREFIX .byte 0xf2
# endif
#endif
#define REGISTER_SAVE_RAX 0
#define REGISTER_SAVE_RCX (REGISTER_SAVE_RAX + 8)
#define REGISTER_SAVE_RDX (REGISTER_SAVE_RCX + 8)

54
sysdeps/x86_64/dl-trampoline.h
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@ -149,8 +149,6 @@ _dl_runtime_resolve:
# Adjust stack(PLT did 2 pushes)
add $(LOCAL_STORAGE_AREA + 16), %RSP_LP
cfi_adjust_cfa_offset(-(LOCAL_STORAGE_AREA + 16))
# Preserve bound registers.
PRESERVE_BND_REGS_PREFIX
jmp *%r11 # Jump to function address.
cfi_endproc
.size _dl_runtime_resolve, .-_dl_runtime_resolve
@ -230,20 +228,6 @@ _dl_runtime_profile:
movaps %xmm6, (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp)
movaps %xmm7, (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp)
# ifndef __ILP32__
# ifdef HAVE_MPX_SUPPORT
bndmov %bnd0, (LR_BND_OFFSET)(%rsp) # Preserve bound
bndmov %bnd1, (LR_BND_OFFSET + BND_SIZE)(%rsp) # registers. Nops if
bndmov %bnd2, (LR_BND_OFFSET + BND_SIZE*2)(%rsp) # MPX not available
bndmov %bnd3, (LR_BND_OFFSET + BND_SIZE*3)(%rsp) # or disabled.
# else
.byte 0x66,0x0f,0x1b,0x84,0x24;.long (LR_BND_OFFSET)
.byte 0x66,0x0f,0x1b,0x8c,0x24;.long (LR_BND_OFFSET + BND_SIZE)
.byte 0x66,0x0f,0x1b,0x94,0x24;.long (LR_BND_OFFSET + BND_SIZE*2)
.byte 0x66,0x0f,0x1b,0x9c,0x24;.long (LR_BND_OFFSET + BND_SIZE*3)
# endif
# endif
# ifdef RESTORE_AVX
/* This is to support AVX audit modules. */
VMOVA %VEC(0), (LR_VECTOR_OFFSET)(%rsp)
@ -366,25 +350,10 @@ _dl_runtime_profile:
vmovdqa %xmm7, (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp)
1:
# endif
# ifndef __ILP32__
# ifdef HAVE_MPX_SUPPORT
bndmov (LR_BND_OFFSET)(%rsp), %bnd0 # Restore bound
bndmov (LR_BND_OFFSET + BND_SIZE)(%rsp), %bnd1 # registers.
bndmov (LR_BND_OFFSET + BND_SIZE*2)(%rsp), %bnd2
bndmov (LR_BND_OFFSET + BND_SIZE*3)(%rsp), %bnd3
# else
.byte 0x66,0x0f,0x1a,0x84,0x24;.long (LR_BND_OFFSET)
.byte 0x66,0x0f,0x1a,0x8c,0x24;.long (LR_BND_OFFSET + BND_SIZE)
.byte 0x66,0x0f,0x1a,0x94,0x24;.long (LR_BND_OFFSET + BND_SIZE*2)
.byte 0x66,0x0f,0x1a,0x9c,0x24;.long (LR_BND_OFFSET + BND_SIZE*3)
# endif
# endif
mov 16(%rbx), %R10_LP # Anything in framesize?
test %R10_LP, %R10_LP
PRESERVE_BND_REGS_PREFIX
jns 3f
/* There's nothing in the frame size, so there
@ -403,7 +372,6 @@ _dl_runtime_profile:
add $48, %RSP_LP # Adjust the stack to the return value
# (eats the reloc index and link_map)
cfi_adjust_cfa_offset(-48)
PRESERVE_BND_REGS_PREFIX
jmp *%r11 # Jump to function address.
3:
@ -430,7 +398,6 @@ _dl_runtime_profile:
movq 32(%rdi), %rsi
movq 40(%rdi), %rdi
PRESERVE_BND_REGS_PREFIX
call *%r11
mov 24(%rbx), %RSP_LP # Drop the copied stack content
@ -475,16 +442,6 @@ _dl_runtime_profile:
vmovdqa %xmm1, (LRV_SIZE + XMM_SIZE)(%rcx)
# endif
# ifndef __ILP32__
# ifdef HAVE_MPX_SUPPORT
bndmov %bnd0, LRV_BND0_OFFSET(%rcx) # Preserve returned bounds.
bndmov %bnd1, LRV_BND1_OFFSET(%rcx)
# else
.byte 0x66,0x0f,0x1b,0x81;.long (LRV_BND0_OFFSET)
.byte 0x66,0x0f,0x1b,0x89;.long (LRV_BND1_OFFSET)
# endif
# endif
fstpt LRV_ST0_OFFSET(%rcx)
fstpt LRV_ST1_OFFSET(%rcx)
@ -515,16 +472,6 @@ _dl_runtime_profile:
VMOVA LRV_VECTOR1_OFFSET(%rsp), %VEC(1)
1:
# endif
# ifndef __ILP32__
# ifdef HAVE_MPX_SUPPORT
bndmov LRV_BND0_OFFSET(%rsp), %bnd0 # Restore bound registers.
bndmov LRV_BND1_OFFSET(%rsp), %bnd1
# else
.byte 0x66,0x0f,0x1a,0x84,0x24;.long (LRV_BND0_OFFSET)
.byte 0x66,0x0f,0x1a,0x8c,0x24;.long (LRV_BND1_OFFSET)
# endif
# endif
fldt LRV_ST1_OFFSET(%rsp)
@ -538,7 +485,6 @@ _dl_runtime_profile:
add $48, %RSP_LP # Adjust the stack to the return value
# (eats the reloc index and link_map)
cfi_adjust_cfa_offset(-48)
PRESERVE_BND_REGS_PREFIX
retq
cfi_endproc

7
sysdeps/x86_64/link-defines.sym
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@ -19,9 +19,6 @@ LR_RBP_OFFSET offsetof (struct La_x86_64_regs, lr_rbp)
LR_RSP_OFFSET offsetof (struct La_x86_64_regs, lr_rsp)
LR_XMM_OFFSET offsetof (struct La_x86_64_regs, lr_xmm)
LR_VECTOR_OFFSET offsetof (struct La_x86_64_regs, lr_vector)
#ifndef __ILP32__
LR_BND_OFFSET offsetof (struct La_x86_64_regs, lr_bnd)
#endif
LRV_SIZE sizeof (struct La_x86_64_retval)
LRV_RAX_OFFSET offsetof (struct La_x86_64_retval, lrv_rax)
@ -32,7 +29,3 @@ LRV_ST0_OFFSET offsetof (struct La_x86_64_retval, lrv_st0)
LRV_ST1_OFFSET offsetof (struct La_x86_64_retval, lrv_st1)
LRV_VECTOR0_OFFSET offsetof (struct La_x86_64_retval, lrv_vector0)
LRV_VECTOR1_OFFSET offsetof (struct La_x86_64_retval, lrv_vector1)
#ifndef __ILP32__
LRV_BND0_OFFSET offsetof (struct La_x86_64_retval, lrv_bnd0)
LRV_BND1_OFFSET offsetof (struct La_x86_64_retval, lrv_bnd1)
#endif