1 /* PLT trampolines. x86-64 version.
2 Copyright (C) 2004-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
21 #include <cpu-features-offsets.h>
22 #include <link-defines.h>
23 #include <isa-level.h>
25 #ifndef DL_STACK_ALIGNMENT
28 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
30 __tls_get_addr may be called with 8-byte stack alignment. Although
31 this bug has been fixed in GCC 4.9.4, 5.3 and 6, we can't assume
32 that stack will be always aligned at 16 bytes. We use unaligned
33 16-byte move to load and store SSE registers, which has no penalty
34 on modern processors if stack is 16-byte aligned. */
35 # define DL_STACK_ALIGNMENT 8
38 /* True if _dl_runtime_resolve should align stack for STATE_SAVE or align
39 stack to 16 bytes before calling _dl_fixup. */
40 #define DL_RUNTIME_RESOLVE_REALIGN_STACK \
41 (STATE_SAVE_ALIGNMENT > DL_STACK_ALIGNMENT \
42 || 16 > DL_STACK_ALIGNMENT)
44 /* Area on stack to save and restore registers used for parameter
45 passing when calling _dl_fixup. */
46 #define REGISTER_SAVE_RAX 0
47 #define REGISTER_SAVE_RCX (REGISTER_SAVE_RAX + 8)
48 #define REGISTER_SAVE_RDX (REGISTER_SAVE_RCX + 8)
49 #define REGISTER_SAVE_RSI (REGISTER_SAVE_RDX + 8)
50 #define REGISTER_SAVE_RDI (REGISTER_SAVE_RSI + 8)
51 #define REGISTER_SAVE_R8 (REGISTER_SAVE_RDI + 8)
52 #define REGISTER_SAVE_R9 (REGISTER_SAVE_R8 + 8)
58 # define VMOVA vmovdqa64
59 # define VEC(i) zmm##i
60 # define _dl_runtime_profile _dl_runtime_profile_avx512
61 # define SECTION(p) p##.evex512
62 # include "dl-trampoline.h"
63 # undef _dl_runtime_profile
69 # if MINIMUM_X86_ISA_LEVEL <= AVX_X86_ISA_LEVEL
71 # define VMOVA vmovdqa
72 # define VEC(i) ymm##i
73 # define SECTION(p) p##.avx
74 # define _dl_runtime_profile _dl_runtime_profile_avx
75 # include "dl-trampoline.h"
76 # undef _dl_runtime_profile
83 # if MINIMUM_X86_ISA_LEVEL < AVX_X86_ISA_LEVEL
84 /* movaps/movups is 1-byte shorter. */
87 # define VEC(i) xmm##i
88 # define _dl_runtime_profile _dl_runtime_profile_sse
90 # include "dl-trampoline.h"
91 # undef _dl_runtime_profile
98 #if MINIMUM_X86_ISA_LEVEL < AVX_X86_ISA_LEVEL
100 # define STATE_SAVE_ALIGNMENT 16
101 # define _dl_runtime_resolve _dl_runtime_resolve_fxsave
102 # include "dl-trampoline.h"
103 # undef _dl_runtime_resolve
105 # undef STATE_SAVE_ALIGNMENT
109 #define STATE_SAVE_ALIGNMENT 64
110 #define _dl_runtime_resolve _dl_runtime_resolve_xsave
111 #include "dl-trampoline.h"
112 #undef _dl_runtime_resolve
114 #undef STATE_SAVE_ALIGNMENT
117 #define STATE_SAVE_ALIGNMENT 64
118 #define _dl_runtime_resolve _dl_runtime_resolve_xsavec
119 #include "dl-trampoline.h"
120 #undef _dl_runtime_resolve
122 #undef STATE_SAVE_ALIGNMENT