File: dl-trampoline.S

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/* PLT trampolines.  x86-64 version.
   Copyright (C) 2004-2016 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, see
   <http://www.gnu.org/licenses/>.  */

#include <config.h>
#include <sysdep.h>
#include <cpu-features.h>
#include <link-defines.h>

#ifndef DL_STACK_ALIGNMENT
/* 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.  We use unaligned
   16-byte move to load and store SSE registers, which has no penalty
   on modern processors if stack is 16-byte aligned.  */
# define DL_STACK_ALIGNMENT 8
#endif

/* True if _dl_runtime_resolve should align stack for STATE_SAVE or align
   stack to 16 bytes before calling _dl_fixup.  */
#define DL_RUNTIME_RESOLVE_REALIGN_STACK \
  (STATE_SAVE_ALIGNMENT > DL_STACK_ALIGNMENT \
   || 16 > DL_STACK_ALIGNMENT)

/* 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)
#define REGISTER_SAVE_RSI	(REGISTER_SAVE_RDX + 8)
#define REGISTER_SAVE_RDI	(REGISTER_SAVE_RSI + 8)
#define REGISTER_SAVE_R8	(REGISTER_SAVE_RDI + 8)
#define REGISTER_SAVE_R9	(REGISTER_SAVE_R8 + 8)

#define RESTORE_AVX

#define VEC_SIZE		64
#define VMOVA			vmovdqa64
#define VEC(i)			zmm##i
#define _dl_runtime_profile	_dl_runtime_profile_avx512
#include "dl-trampoline.h"
#undef _dl_runtime_profile
#undef VEC
#undef VMOVA
#undef VEC_SIZE

#define VEC_SIZE		32
#define VMOVA			vmovdqa
#define VEC(i)			ymm##i
#define _dl_runtime_profile	_dl_runtime_profile_avx
#include "dl-trampoline.h"
#undef _dl_runtime_profile
#undef VEC
#undef VMOVA
#undef VEC_SIZE

/* movaps/movups is 1-byte shorter.  */
#define VEC_SIZE		16
#define VMOVA			movaps
#define VEC(i)			xmm##i
#define _dl_runtime_profile	_dl_runtime_profile_sse
#undef RESTORE_AVX
#include "dl-trampoline.h"
#undef _dl_runtime_profile
#undef VEC
#undef VMOVA
#undef VEC_SIZE

#define USE_FXSAVE
#define STATE_SAVE_ALIGNMENT	16
#define _dl_runtime_resolve	_dl_runtime_resolve_fxsave
#include "dl-trampoline.h"
#undef _dl_runtime_resolve
#undef USE_FXSAVE
#undef STATE_SAVE_ALIGNMENT

#define USE_XSAVE
#define STATE_SAVE_ALIGNMENT	64
#define _dl_runtime_resolve	_dl_runtime_resolve_xsave
#include "dl-trampoline.h"
#undef _dl_runtime_resolve
#undef USE_XSAVE
#undef STATE_SAVE_ALIGNMENT

#define USE_XSAVEC
#define STATE_SAVE_ALIGNMENT	64
#define _dl_runtime_resolve	_dl_runtime_resolve_xsavec
#include "dl-trampoline.h"
#undef _dl_runtime_resolve
#undef USE_XSAVEC
#undef STATE_SAVE_ALIGNMENT