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0aac205a81
Compiler generates the following instruction sequence for GNU2 dynamic TLS access: leaq tls_var@TLSDESC(%rip), %rax call *tls_var@TLSCALL(%rax) or leal tls_var@TLSDESC(%ebx), %eax call *tls_var@TLSCALL(%eax) CALL instruction is transparent to compiler which assumes all registers, except for EFLAGS and RAX/EAX, are unchanged after CALL. When _dl_tlsdesc_dynamic is called, it calls __tls_get_addr on the slow path. __tls_get_addr is a normal function which doesn't preserve any caller-saved registers. _dl_tlsdesc_dynamic saved and restored integer caller-saved registers, but didn't preserve any other caller-saved registers. Add _dl_tlsdesc_dynamic IFUNC functions for FNSAVE, FXSAVE, XSAVE and XSAVEC to save and restore all caller-saved registers. This fixes BZ #31372. Add GLRO(dl_x86_64_runtime_resolve) with GLRO(dl_x86_tlsdesc_dynamic) to optimize elf_machine_runtime_setup. Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
106 lines
3.1 KiB
ArmAsm
106 lines
3.1 KiB
ArmAsm
/* PLT trampolines. x86-64 version.
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Copyright (C) 2004-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <sysdep.h>
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#include <cpu-features-offsets.h>
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#include <features-offsets.h>
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#include <link-defines.h>
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#include <isa-level.h>
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#include "dl-trampoline-save.h"
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/* Area on stack to save and restore registers used for parameter
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passing when calling _dl_fixup. */
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#define REGISTER_SAVE_RAX 0
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#define REGISTER_SAVE_RCX (REGISTER_SAVE_RAX + 8)
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#define REGISTER_SAVE_RDX (REGISTER_SAVE_RCX + 8)
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#define REGISTER_SAVE_RSI (REGISTER_SAVE_RDX + 8)
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#define REGISTER_SAVE_RDI (REGISTER_SAVE_RSI + 8)
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#define REGISTER_SAVE_R8 (REGISTER_SAVE_RDI + 8)
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#define REGISTER_SAVE_R9 (REGISTER_SAVE_R8 + 8)
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#define RESTORE_AVX
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#ifdef SHARED
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# define VEC_SIZE 64
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# define VMOVA vmovdqa64
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# define VEC(i) zmm##i
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# define _dl_runtime_profile _dl_runtime_profile_avx512
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# define SECTION(p) p##.evex512
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# include "dl-trampoline.h"
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# undef _dl_runtime_profile
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# undef VEC
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# undef VMOVA
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# undef VEC_SIZE
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# undef SECTION
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# if MINIMUM_X86_ISA_LEVEL <= AVX_X86_ISA_LEVEL
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# define VEC_SIZE 32
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# define VMOVA vmovdqa
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# define VEC(i) ymm##i
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# define SECTION(p) p##.avx
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# define _dl_runtime_profile _dl_runtime_profile_avx
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# include "dl-trampoline.h"
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# undef _dl_runtime_profile
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# undef VEC
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# undef VMOVA
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# undef VEC_SIZE
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# undef SECTION
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# endif
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# if MINIMUM_X86_ISA_LEVEL < AVX_X86_ISA_LEVEL
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/* movaps/movups is 1-byte shorter. */
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# define VEC_SIZE 16
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# define VMOVA movaps
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# define VEC(i) xmm##i
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# define _dl_runtime_profile _dl_runtime_profile_sse
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# undef RESTORE_AVX
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# include "dl-trampoline.h"
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# undef _dl_runtime_profile
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# undef VEC
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# undef VMOVA
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# undef VEC_SIZE
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# endif
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#endif /* SHARED */
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#if MINIMUM_X86_ISA_LEVEL < AVX_X86_ISA_LEVEL
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# define USE_FXSAVE
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# define STATE_SAVE_ALIGNMENT 16
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# define _dl_runtime_resolve _dl_runtime_resolve_fxsave
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# include "dl-trampoline.h"
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# undef _dl_runtime_resolve
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# undef USE_FXSAVE
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# undef STATE_SAVE_ALIGNMENT
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#endif
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#define USE_XSAVE
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#define STATE_SAVE_ALIGNMENT 64
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#define _dl_runtime_resolve _dl_runtime_resolve_xsave
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#include "dl-trampoline.h"
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#undef _dl_runtime_resolve
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#undef USE_XSAVE
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#undef STATE_SAVE_ALIGNMENT
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#define USE_XSAVEC
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#define STATE_SAVE_ALIGNMENT 64
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#define _dl_runtime_resolve _dl_runtime_resolve_xsavec
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#include "dl-trampoline.h"
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#undef _dl_runtime_resolve
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#undef USE_XSAVEC
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#undef STATE_SAVE_ALIGNMENT
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