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[x86_64] Set DL_RUNTIME_UNALIGNED_VEC_SIZE to 8

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Due to GCC bug:

   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066

__tls_get_addr may be called with 8-byte stack alignment.  Although
this bug has been fixed in GCC 4.9.4, 5.3 and 6, we can't assume
that stack will be always aligned at 16 bytes.  Since SSE optimized
memory/string functions with aligned SSE register load and store are
used in the dynamic linker, we must set DL_RUNTIME_UNALIGNED_VEC_SIZE
to 8 so that _dl_runtime_resolve_sse will align the stack before
calling _dl_fixup:

Dump of assembler code for function _dl_runtime_resolve_sse:
   0x00007ffff7deea90 <+0>:	push   %rbx
   0x00007ffff7deea91 <+1>:	mov    %rsp,%rbx
   0x00007ffff7deea94 <+4>:	and    $0xfffffffffffffff0,%rsp
                                ^^^^^^^^^^^ Align stack to 16 bytes
   0x00007ffff7deea98 <+8>:	sub    $0x100,%rsp
   0x00007ffff7deea9f <+15>:	mov    %rax,0xc0(%rsp)
   0x00007ffff7deeaa7 <+23>:	mov    %rcx,0xc8(%rsp)
   0x00007ffff7deeaaf <+31>:	mov    %rdx,0xd0(%rsp)
   0x00007ffff7deeab7 <+39>:	mov    %rsi,0xd8(%rsp)
   0x00007ffff7deeabf <+47>:	mov    %rdi,0xe0(%rsp)
   0x00007ffff7deeac7 <+55>:	mov    %r8,0xe8(%rsp)
   0x00007ffff7deeacf <+63>:	mov    %r9,0xf0(%rsp)
   0x00007ffff7deead7 <+71>:	movaps %xmm0,(%rsp)
   0x00007ffff7deeadb <+75>:	movaps %xmm1,0x10(%rsp)
   0x00007ffff7deeae0 <+80>:	movaps %xmm2,0x20(%rsp)
   0x00007ffff7deeae5 <+85>:	movaps %xmm3,0x30(%rsp)
   0x00007ffff7deeaea <+90>:	movaps %xmm4,0x40(%rsp)
   0x00007ffff7deeaef <+95>:	movaps %xmm5,0x50(%rsp)
   0x00007ffff7deeaf4 <+100>:	movaps %xmm6,0x60(%rsp)
   0x00007ffff7deeaf9 <+105>:	movaps %xmm7,0x70(%rsp)

	[BZ #19679]
	* sysdeps/x86_64/dl-trampoline.S (DL_RUNIME_UNALIGNED_VEC_SIZE):
	Renamed to ...
	(DL_RUNTIME_UNALIGNED_VEC_SIZE): This.  Set to 8.
	(DL_RUNIME_RESOLVE_REALIGN_STACK): Renamed to ...
	(DL_RUNTIME_RESOLVE_REALIGN_STACK): This.  Updated.
	(DL_RUNIME_RESOLVE_REALIGN_STACK): Renamed to ...
	(DL_RUNTIME_RESOLVE_REALIGN_STACK): This.
	* sysdeps/x86_64/dl-trampoline.h
	(DL_RUNIME_RESOLVE_REALIGN_STACK): Renamed to ...
	(DL_RUNTIME_RESOLVE_REALIGN_STACK): This.
This commit is contained in:
H.J. Lu 2016-02-19 15:43:45 -08:00
parent eab5028860
commit 8d9c92017d
3 changed files with 29 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
ChangeLog
View File

@ -1,3 +1,17 @@
2016-02-19 H.J. Lu <hongjiu.lu@intel.com>
[BZ #19679]
* sysdeps/x86_64/dl-trampoline.S (DL_RUNIME_UNALIGNED_VEC_SIZE):
Renamed to ...
(DL_RUNTIME_UNALIGNED_VEC_SIZE): This. Set to 8.
(DL_RUNIME_RESOLVE_REALIGN_STACK): Renamed to ...
(DL_RUNTIME_RESOLVE_REALIGN_STACK): This. Updated.
(DL_RUNIME_RESOLVE_REALIGN_STACK): Renamed to ...
(DL_RUNTIME_RESOLVE_REALIGN_STACK): This.
* sysdeps/x86_64/dl-trampoline.h
(DL_RUNIME_RESOLVE_REALIGN_STACK): Renamed to ...
(DL_RUNTIME_RESOLVE_REALIGN_STACK): This.
2016-02-19 Mark Wielaard <mjw@redhat.com>
* elf/elf.h: Add NT_ARM_SYSTEM_CALL.

20
sysdeps/x86_64/dl-trampoline.S
View File

@ -33,15 +33,19 @@
# define DL_STACK_ALIGNMENT 8
#endif
#ifndef DL_RUNIME_UNALIGNED_VEC_SIZE
/* The maximum size of unaligned vector load and store. */
# define DL_RUNIME_UNALIGNED_VEC_SIZE 16
#ifndef DL_RUNTIME_UNALIGNED_VEC_SIZE
/* The maximum size in bytes of unaligned vector load and store in the
dynamic linker. Since SSE optimized memory/string functions with
aligned SSE register load and store are used in the dynamic linker,
we must set this to 8 so that _dl_runtime_resolve_sse will align the
stack before calling _dl_fixup. */
# define DL_RUNTIME_UNALIGNED_VEC_SIZE 8
#endif
/* True if _dl_runtime_resolve should align stack to VEC_SIZE bytes. */
#define DL_RUNIME_RESOLVE_REALIGN_STACK \
#define DL_RUNTIME_RESOLVE_REALIGN_STACK \
(VEC_SIZE > DL_STACK_ALIGNMENT \
&& VEC_SIZE > DL_RUNIME_UNALIGNED_VEC_SIZE)
&& VEC_SIZE > DL_RUNTIME_UNALIGNED_VEC_SIZE)
/* Align vector register save area to 16 bytes. */
#define REGISTER_SAVE_VEC_OFF 0
@ -76,7 +80,7 @@
#ifdef HAVE_AVX512_ASM_SUPPORT
# define VEC_SIZE 64
# define VMOVA vmovdqa64
# if DL_RUNIME_RESOLVE_REALIGN_STACK || VEC_SIZE <= DL_STACK_ALIGNMENT
# if DL_RUNTIME_RESOLVE_REALIGN_STACK || VEC_SIZE <= DL_STACK_ALIGNMENT
# define VMOV vmovdqa64
# else
# define VMOV vmovdqu64
@ -100,7 +104,7 @@ strong_alias (_dl_runtime_profile_avx, _dl_runtime_profile_avx512)
#define VEC_SIZE 32
#define VMOVA vmovdqa
#if DL_RUNIME_RESOLVE_REALIGN_STACK || VEC_SIZE <= DL_STACK_ALIGNMENT
#if DL_RUNTIME_RESOLVE_REALIGN_STACK || VEC_SIZE <= DL_STACK_ALIGNMENT
# define VMOV vmovdqa
#else
# define VMOV vmovdqu
@ -119,7 +123,7 @@ strong_alias (_dl_runtime_profile_avx, _dl_runtime_profile_avx512)
/* movaps/movups is 1-byte shorter. */
#define VEC_SIZE 16
#define VMOVA movaps
#if DL_RUNIME_RESOLVE_REALIGN_STACK || VEC_SIZE <= DL_STACK_ALIGNMENT
#if DL_RUNTIME_RESOLVE_REALIGN_STACK || VEC_SIZE <= DL_STACK_ALIGNMENT
# define VMOV movaps
#else
# define VMOV movups

6
sysdeps/x86_64/dl-trampoline.h
View File

@ -30,7 +30,7 @@
#undef REGISTER_SAVE_AREA
#undef LOCAL_STORAGE_AREA
#undef BASE
#if DL_RUNIME_RESOLVE_REALIGN_STACK
#if DL_RUNTIME_RESOLVE_REALIGN_STACK
# define REGISTER_SAVE_AREA (REGISTER_SAVE_AREA_RAW + 8)
/* Local stack area before jumping to function address: RBX. */
# define LOCAL_STORAGE_AREA 8
@ -57,7 +57,7 @@
cfi_startproc
_dl_runtime_resolve:
cfi_adjust_cfa_offset(16) # Incorporate PLT
#if DL_RUNIME_RESOLVE_REALIGN_STACK
#if DL_RUNTIME_RESOLVE_REALIGN_STACK
# if LOCAL_STORAGE_AREA != 8
# error LOCAL_STORAGE_AREA must be 8
# endif
@ -146,7 +146,7 @@ _dl_runtime_resolve:
VMOV (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 5)(%rsp), %VEC(5)
VMOV (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 6)(%rsp), %VEC(6)
VMOV (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 7)(%rsp), %VEC(7)
#if DL_RUNIME_RESOLVE_REALIGN_STACK
#if DL_RUNTIME_RESOLVE_REALIGN_STACK
mov %RBX_LP, %RSP_LP
cfi_def_cfa_register(%rsp)
movq (%rsp), %rbx