Secure AVX changes for auditing code.
The original AVX patch used a function pointer to handle the difference between machines with and without AVX support. This is insecure. A well-placed memory exploit could lead to redirection of the execution. Using a variable and several tests is a bit slower but cannot be exploited in this way.
This commit is contained in:
parent
59cbcac015
commit
d7bd7a8ae8
|
@ -1,7 +1,8 @@
|
|||
2009-07-07 H.J. Lu <hongjiu.lu@intel.com>
|
||||
2009-07-15 Ulrich Drepper <drepper@redhat.com>
|
||||
|
||||
* elf/Makefile: Don't build modules for tst-audit4 and tst-audit5
|
||||
for anything but x86-64 targets.
|
||||
* sysdeps/x86-64/dl-trampoline.h: Remove after integrating code into...
|
||||
* sysdeps/x86-64/dl-trampoline.S: ...here. Rewrite to avoid function
|
||||
pointers in writable memory.
|
||||
|
||||
2009-07-07 H.J. Lu <hongjiu.lu@intel.com>
|
||||
|
||||
|
|
|
@ -96,9 +96,9 @@ _dl_runtime_profile:
|
|||
to detect if any xmm0-xmm7 registers are changed by audit
|
||||
module. */
|
||||
subq $(LR_SIZE + XMM_SIZE*8), %rsp
|
||||
#else
|
||||
# else
|
||||
subq $LR_SIZE, %rsp # sizeof(La_x86_64_regs)
|
||||
#endif
|
||||
# endif
|
||||
movq %rsp, 24(%rbx)
|
||||
|
||||
/* Fill the La_x86_64_regs structure. */
|
||||
|
@ -110,45 +110,308 @@ _dl_runtime_profile:
|
|||
movq %rdi, LR_RDI_OFFSET(%rsp)
|
||||
movq %rbp, LR_RBP_OFFSET(%rsp)
|
||||
|
||||
# ifdef HAVE_AVX_SUPPORT
|
||||
jmp *L(save_and_restore_vector)(%rip)
|
||||
leaq 48(%rbx), %rax
|
||||
movq %rax, LR_RSP_OFFSET(%rsp)
|
||||
|
||||
.align 16
|
||||
L(save_and_restore_vector_sse):
|
||||
# endif
|
||||
|
||||
# define MOVXMM movaps
|
||||
# include "dl-trampoline.h"
|
||||
/* We always store the XMM registers even if AVX is available.
|
||||
This is to provide backward binary compatility for existing
|
||||
audit modules. */
|
||||
movaps %xmm0, (LR_XMM_OFFSET)(%rsp)
|
||||
movaps %xmm1, (LR_XMM_OFFSET + XMM_SIZE)(%rsp)
|
||||
movaps %xmm2, (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp)
|
||||
movaps %xmm3, (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp)
|
||||
movaps %xmm4, (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp)
|
||||
movaps %xmm5, (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp)
|
||||
movaps %xmm6, (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp)
|
||||
movaps %xmm7, (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp)
|
||||
|
||||
# ifdef HAVE_AVX_SUPPORT
|
||||
# undef MOVXMM
|
||||
# define MOVXMM vmovdqa
|
||||
# define RESTORE_AVX
|
||||
.align 16
|
||||
L(save_and_restore_vector_avx):
|
||||
# include "dl-trampoline.h"
|
||||
.data
|
||||
L(have_avx):
|
||||
.zero 4
|
||||
.size L(have_avx), 4
|
||||
.previous
|
||||
|
||||
cmpl $0, L(have_avx)(%rip)
|
||||
jne 1f
|
||||
movq %rbx, %r11 # Save rbx
|
||||
movl $1, %eax
|
||||
cpuid
|
||||
movq %r11,%rbx # Restore rbx
|
||||
movl $1, %eax
|
||||
testl $(1 << 28), %ecx
|
||||
jne 2f
|
||||
negl %eax
|
||||
2: movl %eax, L(have_eax)(%rip)
|
||||
cmpl $0, %eax
|
||||
|
||||
1: js L(no_avx1)
|
||||
|
||||
/* This is to support AVX audit modules. */
|
||||
vmovdqu %ymm0, (LR_VECTOR_OFFSET)(%rsp)
|
||||
vmovdqu %ymm1, (LR_VECTOR_OFFSET + VECTOR_SIZE)(%rsp)
|
||||
vmovdqu %ymm2, (LR_VECTOR_OFFSET + VECTOR_SIZE*2)(%rsp)
|
||||
vmovdqu %ymm3, (LR_VECTOR_OFFSET + VECTOR_SIZE*3)(%rsp)
|
||||
vmovdqu %ymm4, (LR_VECTOR_OFFSET + VECTOR_SIZE*4)(%rsp)
|
||||
vmovdqu %ymm5, (LR_VECTOR_OFFSET + VECTOR_SIZE*5)(%rsp)
|
||||
vmovdqu %ymm6, (LR_VECTOR_OFFSET + VECTOR_SIZE*6)(%rsp)
|
||||
vmovdqu %ymm7, (LR_VECTOR_OFFSET + VECTOR_SIZE*7)(%rsp)
|
||||
|
||||
/* Save xmm0-xmm7 registers to detect if any of them are
|
||||
changed by audit module. */
|
||||
vmovdqa %xmm0, (LR_SIZE)(%rsp)
|
||||
vmovdqa %xmm1, (LR_SIZE + XMM_SIZE)(%rsp)
|
||||
vmovdqa %xmm2, (LR_SIZE + XMM_SIZE*2)(%rsp)
|
||||
vmovdqa %xmm3, (LR_SIZE + XMM_SIZE*3)(%rsp)
|
||||
vmovdqa %xmm4, (LR_SIZE + XMM_SIZE*4)(%rsp)
|
||||
vmovdqa %xmm5, (LR_SIZE + XMM_SIZE*5)(%rsp)
|
||||
vmovdqa %xmm6, (LR_SIZE + XMM_SIZE*6)(%rsp)
|
||||
vmovdqa %xmm7, (LR_SIZE + XMM_SIZE*7)(%rsp)
|
||||
|
||||
L(no_avx1):
|
||||
# endif
|
||||
|
||||
movq %rsp, %rcx # La_x86_64_regs pointer to %rcx.
|
||||
movq 48(%rbx), %rdx # Load return address if needed.
|
||||
movq 40(%rbx), %rsi # Copy args pushed by PLT in register.
|
||||
movq 32(%rbx), %rdi # %rdi: link_map, %rsi: reloc_index
|
||||
leaq 16(%rbx), %r8
|
||||
call _dl_profile_fixup # Call resolver.
|
||||
|
||||
movq %rax, %r11 # Save return value.
|
||||
|
||||
movq 8(%rbx), %rax # Get back register content.
|
||||
movq LR_RDX_OFFSET(%rsp), %rdx
|
||||
movq LR_R8_OFFSET(%rsp), %r8
|
||||
movq LR_R9_OFFSET(%rsp), %r9
|
||||
|
||||
# ifdef HAVE_AVX_SUPPORT
|
||||
cmpl $0, L(have_avx)(%rip)
|
||||
js L(no_avx2)
|
||||
|
||||
/* Check if any xmm0-xmm7 registers are changed by audit
|
||||
module. */
|
||||
vmovdqa (LR_XMM_OFFSET)(%rsp), %xmm0
|
||||
vpcmpeqq (LR_SIZE)(%rsp), %xmm0, %xmm1
|
||||
vpmovmskb %xmm1, %esi
|
||||
cmpl $0xffff, %esi
|
||||
je 1f
|
||||
vmovdqu (LR_VECTOR_OFFSET)(%rsp), %ymm0
|
||||
|
||||
1: vmovdqa (LR_XMM_OFFSET + XMM_SIZE)(%rsp), %xmm1
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE)(%rsp), %xmm1, %xmm2
|
||||
vpmovmskb %xmm2, %esi
|
||||
cmpl $0xffff, %esi
|
||||
je 1f
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE)(%rsp), %ymm1
|
||||
|
||||
1: vmovdqa (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp), %xmm2
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE*2)(%rsp), %xmm2, %xmm3
|
||||
vpmovmskb %xmm3, %esi
|
||||
cmpl $0xffff, %esi
|
||||
je 1f
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*2)(%rsp), %ymm2
|
||||
|
||||
1: vmovdqa (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp), %xmm3
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE*3)(%rsp), %xmm3, %xmm4
|
||||
vpmovmskb %xmm4, %esi
|
||||
cmpl $0xffff, %esi
|
||||
je 1f
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*3)(%rsp), %ymm3
|
||||
|
||||
1: vmovdqa (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp), %xmm4
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE*4)(%rsp), %xmm4, %xmm5
|
||||
vpmovmskb %xmm5, %esi
|
||||
cmpl $0xffff, %esi
|
||||
je 1f
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*4)(%rsp), %ymm4
|
||||
|
||||
1: vmovdqa (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp), %xmm5
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE*5)(%rsp), %xmm5, %xmm6
|
||||
vpmovmskb %xmm6, %esi
|
||||
cmpl $0xffff, %esi
|
||||
je 1f
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*5)(%rsp), %ymm5
|
||||
|
||||
1: vmovdqa (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp), %xmm6
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE*6)(%rsp), %xmm6, %xmm7
|
||||
vpmovmskb %xmm7, %esi
|
||||
cmpl $0xffff, %esi
|
||||
je 1f
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*6)(%rsp), %ymm6
|
||||
|
||||
1: vmovdqa (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp), %xmm7
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE*7)(%rsp), %xmm7, %xmm8
|
||||
vpmovmskb %xmm8, %esi
|
||||
cmpl $0xffff, %esi
|
||||
je 1f
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*7)(%rsp), %ymm7
|
||||
jmp 1f
|
||||
|
||||
L(no_avx2):
|
||||
vmovdqa (LR_XMM_OFFSET)(%rsp), %xmm0
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE)(%rsp), %xmm1
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp), %xmm2
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp), %xmm3
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp), %xmm4
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp), %xmm5
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp), %xmm6
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp), %xmm7
|
||||
|
||||
1:
|
||||
# else
|
||||
movaps (LR_XMM_OFFSET)(%rsp), %xmm0
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE)(%rsp), %xmm1
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp), %xmm2
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp), %xmm3
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp), %xmm4
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp), %xmm5
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp), %xmm6
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp), %xmm7
|
||||
# endif
|
||||
|
||||
movq 16(%rbx), %r10 # Anything in framesize?
|
||||
testq %r10, %r10
|
||||
jns 3f
|
||||
|
||||
/* There's nothing in the frame size, so there
|
||||
will be no call to the _dl_call_pltexit. */
|
||||
|
||||
/* Get back registers content. */
|
||||
movq LR_RCX_OFFSET(%rsp), %rcx
|
||||
movq LR_RSI_OFFSET(%rsp), %rsi
|
||||
movq LR_RDI_OFFSET(%rsp), %rdi
|
||||
|
||||
movq %rbx, %rsp
|
||||
movq (%rsp), %rbx
|
||||
cfi_restore(rbx)
|
||||
cfi_def_cfa_register(%rsp)
|
||||
|
||||
addq $48, %rsp # Adjust the stack to the return value
|
||||
# (eats the reloc index and link_map)
|
||||
cfi_adjust_cfa_offset(-48)
|
||||
jmp *%r11 # Jump to function address.
|
||||
|
||||
3:
|
||||
cfi_adjust_cfa_offset(48)
|
||||
cfi_rel_offset(%rbx, 0)
|
||||
cfi_def_cfa_register(%rbx)
|
||||
|
||||
/* At this point we need to prepare new stack for the function
|
||||
which has to be called. We copy the original stack to a
|
||||
temporary buffer of the size specified by the 'framesize'
|
||||
returned from _dl_profile_fixup */
|
||||
|
||||
leaq LR_RSP_OFFSET(%rbx), %rsi # stack
|
||||
addq $8, %r10
|
||||
andq $0xfffffffffffffff0, %r10
|
||||
movq %r10, %rcx
|
||||
subq %r10, %rsp
|
||||
movq %rsp, %rdi
|
||||
shrq $3, %rcx
|
||||
rep
|
||||
movsq
|
||||
|
||||
movq 24(%rdi), %rcx # Get back register content.
|
||||
movq 32(%rdi), %rsi
|
||||
movq 40(%rdi), %rdi
|
||||
|
||||
call *%r11
|
||||
|
||||
mov 24(%rbx), %rsp # Drop the copied stack content
|
||||
|
||||
/* Now we have to prepare the La_x86_64_retval structure for the
|
||||
_dl_call_pltexit. The La_x86_64_regs is being pointed by rsp now,
|
||||
so we just need to allocate the sizeof(La_x86_64_retval) space on
|
||||
the stack, since the alignment has already been taken care of. */
|
||||
# ifdef HAVE_AVX_SUPPORT
|
||||
/* sizeof(La_x86_64_retval). Need extra space for 2 SSE
|
||||
registers to detect if xmm0/xmm1 registers are changed
|
||||
by audit module. */
|
||||
subq $(LRV_SIZE + XMM_SIZE*2), %rsp
|
||||
# else
|
||||
subq $LRV_SIZE, %rsp # sizeof(La_x86_64_retval)
|
||||
# endif
|
||||
movq %rsp, %rcx # La_x86_64_retval argument to %rcx.
|
||||
|
||||
/* Fill in the La_x86_64_retval structure. */
|
||||
movq %rax, LRV_RAX_OFFSET(%rcx)
|
||||
movq %rdx, LRV_RDX_OFFSET(%rcx)
|
||||
|
||||
movaps %xmm0, LRV_XMM0_OFFSET(%rcx)
|
||||
movaps %xmm1, LRV_XMM1_OFFSET(%rcx)
|
||||
|
||||
# ifdef HAVE_AVX_SUPPORT
|
||||
cmpl $0, L(have_avx)(%rip)
|
||||
js L(no_avx3)
|
||||
|
||||
/* This is to support AVX audit modules. */
|
||||
vmovdqu %ymm0, LRV_VECTOR0_OFFSET(%rcx)
|
||||
vmovdqu %ymm1, LRV_VECTOR1_OFFSET(%rcx)
|
||||
|
||||
/* Save xmm0/xmm1 registers to detect if they are changed
|
||||
by audit module. */
|
||||
vmovdqa %xmm0, (LRV_SIZE)(%rcx)
|
||||
vmovdqa %xmm1, (LRV_SIZE + XMM_SIZE)(%rcx)
|
||||
|
||||
L(no_avx3):
|
||||
# endif
|
||||
|
||||
fstpt LRV_ST0_OFFSET(%rcx)
|
||||
fstpt LRV_ST1_OFFSET(%rcx)
|
||||
|
||||
movq 24(%rbx), %rdx # La_x86_64_regs argument to %rdx.
|
||||
movq 40(%rbx), %rsi # Copy args pushed by PLT in register.
|
||||
movq 32(%rbx), %rdi # %rdi: link_map, %rsi: reloc_index
|
||||
call _dl_call_pltexit
|
||||
|
||||
/* Restore return registers. */
|
||||
movq LRV_RAX_OFFSET(%rsp), %rax
|
||||
movq LRV_RDX_OFFSET(%rsp), %rdx
|
||||
|
||||
# ifdef HAVE_AVX_SUPPORT
|
||||
cmpl $0, L(have_avx)(%rip)
|
||||
js L(no_avx4)
|
||||
|
||||
/* Check if xmm0/xmm1 registers are changed by audit module. */
|
||||
vmovdqa LRV_XMM0_OFFSET(%rsp), %xmm0
|
||||
vpcmpeqq (LRV_SIZE)(%rsp), %xmm0, %xmm1
|
||||
vpmovmskb %xmm1, %esi
|
||||
cmpl $0xffff, %esi
|
||||
je 1f
|
||||
vmovdqu LRV_VECTOR0_OFFSET(%rsp), %ymm0
|
||||
|
||||
1: vmovdqa LRV_XMM1_OFFSET(%rsp), %xmm1
|
||||
vpcmpeqq (LRV_SIZE + XMM_SIZE)(%rsp), %xmm1, %xmm2
|
||||
vpmovmskb %xmm2, %esi
|
||||
cmpl $0xffff, %esi
|
||||
je 1f
|
||||
vmovdqu LRV_VECTOR1_OFFSET(%rsp), %ymm1
|
||||
jmp 1f
|
||||
|
||||
L(no_avx4):
|
||||
vmovdqa LRV_XMM0_OFFSET(%rsp), %xmm0
|
||||
vmovdqa LRV_XMM1_OFFSET(%rsp), %xmm1
|
||||
|
||||
1:
|
||||
# else
|
||||
movaps LRV_XMM0_OFFSET(%rsp), %xmm0
|
||||
movaps LRV_XMM1_OFFSET(%rsp), %xmm1
|
||||
# endif
|
||||
|
||||
fldt LRV_ST1_OFFSET(%rsp)
|
||||
fldt LRV_ST0_OFFSET(%rsp)
|
||||
|
||||
movq %rbx, %rsp
|
||||
movq (%rsp), %rbx
|
||||
cfi_restore(rbx)
|
||||
cfi_def_cfa_register(%rsp)
|
||||
|
||||
addq $48, %rsp # Adjust the stack to the return value
|
||||
# (eats the reloc index and link_map)
|
||||
cfi_adjust_cfa_offset(-48)
|
||||
retq
|
||||
|
||||
cfi_endproc
|
||||
.size _dl_runtime_profile, .-_dl_runtime_profile
|
||||
|
||||
# ifdef HAVE_AVX_SUPPORT
|
||||
L(check_avx):
|
||||
mov %rbx,%r11 # Save rbx
|
||||
movl $1, %eax
|
||||
cpuid
|
||||
mov %r11,%rbx # Restore rbx
|
||||
leaq L(save_and_restore_vector_sse)(%rip), %rax
|
||||
andl $(1 << 28), %ecx # Check if AVX is available.
|
||||
jz L(ret)
|
||||
leaq L(save_and_restore_vector_avx)(%rip), %rax
|
||||
L(ret):
|
||||
movq %rax,L(save_and_restore_vector)(%rip)
|
||||
jmp *%rax
|
||||
|
||||
.section .data.rel.local,"aw",@progbits
|
||||
.align 8
|
||||
L(save_and_restore_vector):
|
||||
.quad L(check_avx)
|
||||
# endif
|
||||
#endif
|
||||
|
|
|
@ -1,291 +0,0 @@
|
|||
/* Partial PLT profile trampoline to save and restore x86-64 vector
|
||||
registers.
|
||||
Copyright (C) 2009 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
||||
leaq 48(%rbx), %rax
|
||||
movq %rax, LR_RSP_OFFSET(%rsp)
|
||||
|
||||
/* This is to provide backward binary compatility for existing
|
||||
audit modules. */
|
||||
MOVXMM %xmm0, (LR_XMM_OFFSET)(%rsp)
|
||||
MOVXMM %xmm1, (LR_XMM_OFFSET + XMM_SIZE)(%rsp)
|
||||
MOVXMM %xmm2, (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp)
|
||||
MOVXMM %xmm3, (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp)
|
||||
MOVXMM %xmm4, (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp)
|
||||
MOVXMM %xmm5, (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp)
|
||||
MOVXMM %xmm6, (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp)
|
||||
MOVXMM %xmm7, (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp)
|
||||
|
||||
#ifdef RESTORE_AVX
|
||||
/* This is to support AVX audit modules. */
|
||||
vmovdqu %ymm0, (LR_VECTOR_OFFSET)(%rsp)
|
||||
vmovdqu %ymm1, (LR_VECTOR_OFFSET + VECTOR_SIZE)(%rsp)
|
||||
vmovdqu %ymm2, (LR_VECTOR_OFFSET + VECTOR_SIZE*2)(%rsp)
|
||||
vmovdqu %ymm3, (LR_VECTOR_OFFSET + VECTOR_SIZE*3)(%rsp)
|
||||
vmovdqu %ymm4, (LR_VECTOR_OFFSET + VECTOR_SIZE*4)(%rsp)
|
||||
vmovdqu %ymm5, (LR_VECTOR_OFFSET + VECTOR_SIZE*5)(%rsp)
|
||||
vmovdqu %ymm6, (LR_VECTOR_OFFSET + VECTOR_SIZE*6)(%rsp)
|
||||
vmovdqu %ymm7, (LR_VECTOR_OFFSET + VECTOR_SIZE*7)(%rsp)
|
||||
|
||||
/* Save xmm0-xmm7 registers to detect if any of them are
|
||||
changed by audit module. */
|
||||
vmovdqa %xmm0, (LR_SIZE)(%rsp)
|
||||
vmovdqa %xmm1, (LR_SIZE + XMM_SIZE)(%rsp)
|
||||
vmovdqa %xmm2, (LR_SIZE + XMM_SIZE*2)(%rsp)
|
||||
vmovdqa %xmm3, (LR_SIZE + XMM_SIZE*3)(%rsp)
|
||||
vmovdqa %xmm4, (LR_SIZE + XMM_SIZE*4)(%rsp)
|
||||
vmovdqa %xmm5, (LR_SIZE + XMM_SIZE*5)(%rsp)
|
||||
vmovdqa %xmm6, (LR_SIZE + XMM_SIZE*6)(%rsp)
|
||||
vmovdqa %xmm7, (LR_SIZE + XMM_SIZE*7)(%rsp)
|
||||
#endif
|
||||
|
||||
movq %rsp, %rcx # La_x86_64_regs pointer to %rcx.
|
||||
movq 48(%rbx), %rdx # Load return address if needed.
|
||||
movq 40(%rbx), %rsi # Copy args pushed by PLT in register.
|
||||
movq 32(%rbx), %rdi # %rdi: link_map, %rsi: reloc_index
|
||||
leaq 16(%rbx), %r8
|
||||
call _dl_profile_fixup # Call resolver.
|
||||
|
||||
movq %rax, %r11 # Save return value.
|
||||
|
||||
movq 8(%rbx), %rax # Get back register content.
|
||||
movq LR_RDX_OFFSET(%rsp), %rdx
|
||||
movq LR_R8_OFFSET(%rsp), %r8
|
||||
movq LR_R9_OFFSET(%rsp), %r9
|
||||
|
||||
#ifdef RESTORE_AVX
|
||||
/* Check if any xmm0-xmm7 registers are changed by audit
|
||||
module. */
|
||||
vmovdqa (LR_XMM_OFFSET)(%rsp), %xmm0
|
||||
vpcmpeqq (LR_SIZE)(%rsp), %xmm0, %xmm1
|
||||
vpmovmskb %xmm1, %esi
|
||||
cmpl $0xffff, %esi
|
||||
jne 1f
|
||||
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE)(%rsp), %xmm0
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE)(%rsp), %xmm0, %xmm1
|
||||
vpmovmskb %xmm1, %esi
|
||||
cmpl $0xffff, %esi
|
||||
jne 1f
|
||||
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp), %xmm0
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE*2)(%rsp), %xmm0, %xmm1
|
||||
vpmovmskb %xmm1, %esi
|
||||
cmpl $0xffff, %esi
|
||||
jne 1f
|
||||
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp), %xmm0
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE*3)(%rsp), %xmm0, %xmm1
|
||||
vpmovmskb %xmm1, %esi
|
||||
cmpl $0xffff, %esi
|
||||
jne 1f
|
||||
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp), %xmm0
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE*4)(%rsp), %xmm0, %xmm1
|
||||
vpmovmskb %xmm1, %esi
|
||||
cmpl $0xffff, %esi
|
||||
jne 1f
|
||||
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp), %xmm0
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE*5)(%rsp), %xmm0, %xmm1
|
||||
vpmovmskb %xmm1, %esi
|
||||
cmpl $0xffff, %esi
|
||||
jne 1f
|
||||
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp), %xmm0
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE*6)(%rsp), %xmm0, %xmm1
|
||||
vpmovmskb %xmm1, %esi
|
||||
cmpl $0xffff, %esi
|
||||
jne 1f
|
||||
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp), %xmm0
|
||||
vpcmpeqq (LR_SIZE + XMM_SIZE*7)(%rsp), %xmm0, %xmm1
|
||||
vpmovmskb %xmm1, %esi
|
||||
cmpl $0xffff, %esi
|
||||
jne 1f
|
||||
|
||||
/* We restore AVX registers only if xmm0-xmm7 registers are
|
||||
unchanged. */
|
||||
vmovdqu (LR_VECTOR_OFFSET)(%rsp), %ymm0
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE)(%rsp), %ymm1
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*2)(%rsp), %ymm2
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*3)(%rsp), %ymm3
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*4)(%rsp), %ymm4
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*5)(%rsp), %ymm5
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*6)(%rsp), %ymm6
|
||||
vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*7)(%rsp), %ymm7
|
||||
jmp 2f
|
||||
|
||||
1:
|
||||
vmovdqa (LR_XMM_OFFSET)(%rsp), %xmm0
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE)(%rsp), %xmm1
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp), %xmm2
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp), %xmm3
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp), %xmm4
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp), %xmm5
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp), %xmm6
|
||||
vmovdqa (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp), %xmm7
|
||||
|
||||
2:
|
||||
#else
|
||||
movaps (LR_XMM_OFFSET)(%rsp), %xmm0
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE)(%rsp), %xmm1
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp), %xmm2
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp), %xmm3
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp), %xmm4
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp), %xmm5
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp), %xmm6
|
||||
movaps (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp), %xmm7
|
||||
#endif
|
||||
|
||||
movq 16(%rbx), %r10 # Anything in framesize?
|
||||
testq %r10, %r10
|
||||
jns 3f
|
||||
|
||||
/* There's nothing in the frame size, so there
|
||||
will be no call to the _dl_call_pltexit. */
|
||||
|
||||
/* Get back registers content. */
|
||||
movq LR_RCX_OFFSET(%rsp), %rcx
|
||||
movq LR_RSI_OFFSET(%rsp), %rsi
|
||||
movq LR_RDI_OFFSET(%rsp), %rdi
|
||||
|
||||
movq %rbx, %rsp
|
||||
movq (%rsp), %rbx
|
||||
cfi_restore(rbx)
|
||||
cfi_def_cfa_register(%rsp)
|
||||
|
||||
addq $48, %rsp # Adjust the stack to the return value
|
||||
# (eats the reloc index and link_map)
|
||||
cfi_adjust_cfa_offset(-48)
|
||||
jmp *%r11 # Jump to function address.
|
||||
|
||||
3:
|
||||
cfi_adjust_cfa_offset(48)
|
||||
cfi_rel_offset(%rbx, 0)
|
||||
cfi_def_cfa_register(%rbx)
|
||||
|
||||
/* At this point we need to prepare new stack for the function
|
||||
which has to be called. We copy the original stack to a
|
||||
temporary buffer of the size specified by the 'framesize'
|
||||
returned from _dl_profile_fixup */
|
||||
|
||||
leaq LR_RSP_OFFSET(%rbx), %rsi # stack
|
||||
addq $8, %r10
|
||||
andq $0xfffffffffffffff0, %r10
|
||||
movq %r10, %rcx
|
||||
subq %r10, %rsp
|
||||
movq %rsp, %rdi
|
||||
shrq $3, %rcx
|
||||
rep
|
||||
movsq
|
||||
|
||||
movq 24(%rdi), %rcx # Get back register content.
|
||||
movq 32(%rdi), %rsi
|
||||
movq 40(%rdi), %rdi
|
||||
|
||||
call *%r11
|
||||
|
||||
mov 24(%rbx), %rsp # Drop the copied stack content
|
||||
|
||||
/* Now we have to prepare the La_x86_64_retval structure for the
|
||||
_dl_call_pltexit. The La_x86_64_regs is being pointed by rsp now,
|
||||
so we just need to allocate the sizeof(La_x86_64_retval) space on
|
||||
the stack, since the alignment has already been taken care of. */
|
||||
#ifdef RESTORE_AVX
|
||||
/* sizeof(La_x86_64_retval). Need extra space for 2 SSE
|
||||
registers to detect if xmm0/xmm1 registers are changed
|
||||
by audit module. */
|
||||
subq $(LRV_SIZE + XMM_SIZE*2), %rsp
|
||||
#else
|
||||
subq $LRV_SIZE, %rsp # sizeof(La_x86_64_retval)
|
||||
#endif
|
||||
movq %rsp, %rcx # La_x86_64_retval argument to %rcx.
|
||||
|
||||
/* Fill in the La_x86_64_retval structure. */
|
||||
movq %rax, LRV_RAX_OFFSET(%rcx)
|
||||
movq %rdx, LRV_RDX_OFFSET(%rcx)
|
||||
|
||||
MOVXMM %xmm0, LRV_XMM0_OFFSET(%rcx)
|
||||
MOVXMM %xmm1, LRV_XMM1_OFFSET(%rcx)
|
||||
|
||||
#ifdef RESTORE_AVX
|
||||
/* This is to support AVX audit modules. */
|
||||
vmovdqu %ymm0, LRV_VECTOR0_OFFSET(%rcx)
|
||||
vmovdqu %ymm1, LRV_VECTOR1_OFFSET(%rcx)
|
||||
|
||||
/* Save xmm0/xmm1 registers to detect if they are changed
|
||||
by audit module. */
|
||||
vmovdqa %xmm0, (LRV_SIZE)(%rcx)
|
||||
vmovdqa %xmm1, (LRV_SIZE + XMM_SIZE)(%rcx)
|
||||
#endif
|
||||
|
||||
fstpt LRV_ST0_OFFSET(%rcx)
|
||||
fstpt LRV_ST1_OFFSET(%rcx)
|
||||
|
||||
movq 24(%rbx), %rdx # La_x86_64_regs argument to %rdx.
|
||||
movq 40(%rbx), %rsi # Copy args pushed by PLT in register.
|
||||
movq 32(%rbx), %rdi # %rdi: link_map, %rsi: reloc_index
|
||||
call _dl_call_pltexit
|
||||
|
||||
/* Restore return registers. */
|
||||
movq LRV_RAX_OFFSET(%rsp), %rax
|
||||
movq LRV_RDX_OFFSET(%rsp), %rdx
|
||||
|
||||
#ifdef RESTORE_AVX
|
||||
/* Check if xmm0/xmm1 registers are changed by audit module. */
|
||||
vmovdqa LRV_XMM0_OFFSET(%rsp), %xmm0
|
||||
vpcmpeqq (LRV_SIZE)(%rsp), %xmm0, %xmm1
|
||||
vpmovmskb %xmm1, %esi
|
||||
cmpl $0xffff, %esi
|
||||
jne 4f
|
||||
|
||||
/* We restore AVX registers only if xmm0/xmm1 registers are
|
||||
unchanged. */
|
||||
vmovdqa LRV_XMM1_OFFSET(%rsp), %xmm0
|
||||
vpcmpeqq (LRV_SIZE + XMM_SIZE)(%rsp), %xmm0, %xmm1
|
||||
vpmovmskb %xmm1, %esi
|
||||
cmpl $0xffff, %esi
|
||||
jne 4f
|
||||
|
||||
vmovdqu LRV_VECTOR0_OFFSET(%rsp), %ymm0
|
||||
vmovdqu LRV_VECTOR1_OFFSET(%rsp), %ymm1
|
||||
jmp 5f
|
||||
|
||||
4:
|
||||
vmovdqa LRV_XMM0_OFFSET(%rsp), %xmm0
|
||||
vmovdqa LRV_XMM1_OFFSET(%rsp), %xmm1
|
||||
5:
|
||||
#else
|
||||
movaps LRV_XMM0_OFFSET(%rsp), %xmm0
|
||||
movaps LRV_XMM1_OFFSET(%rsp), %xmm1
|
||||
#endif
|
||||
|
||||
fldt LRV_ST0_OFFSET(%rsp)
|
||||
fldt LRV_ST0_OFFSET(%rsp)
|
||||
|
||||
movq %rbx, %rsp
|
||||
movq (%rsp), %rbx
|
||||
cfi_restore(rbx)
|
||||
cfi_def_cfa_register(%rsp)
|
||||
|
||||
addq $48, %rsp # Adjust the stack to the return value
|
||||
# (eats the reloc index and link_map)
|
||||
cfi_adjust_cfa_offset(-48)
|
||||
retq
|
Loading…
Reference in New Issue