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848f0e46f0
Compiler generates the following instruction sequence for dynamic TLS access: leal tls_var@tlsgd(,%ebx,1), %eax call ___tls_get_addr@PLT CALL instruction is transparent to compiler which assumes all registers, except for EFLAGS, AX, CX, and DX, are unchanged after CALL. But ___tls_get_addr is a normal function which doesn't preserve any vector registers. 1. Rename the generic __tls_get_addr function to ___tls_get_addr_internal. 2. Change ___tls_get_addr to a wrapper function with implementations for FNSAVE, FXSAVE, XSAVE and XSAVEC to save and restore all vector registers. 3. dl-tlsdesc-dynamic.h has: _dl_tlsdesc_dynamic: /* Like all TLS resolvers, preserve call-clobbered registers. We need two scratch regs anyway. */ subl $32, %esp cfi_adjust_cfa_offset (32) It is wrong to use movl %ebx, -28(%esp) movl %esp, %ebx cfi_def_cfa_register(%ebx) ... mov %ebx, %esp cfi_def_cfa_register(%esp) movl -28(%esp), %ebx to preserve EBX on stack. Fix it with: movl %ebx, 28(%esp) movl %esp, %ebx cfi_def_cfa_register(%ebx) ... mov %ebx, %esp cfi_def_cfa_register(%esp) movl 28(%esp), %ebx 4. Update _dl_tlsdesc_dynamic to call ___tls_get_addr_internal directly. 5. Add have-test-mtls-traditional to compile tst-tls23-mod.c with traditional TLS variant to verify the fix. 6. Define DL_RUNTIME_RESOLVE_REALIGN_STACK in sysdeps/x86/sysdep.h. This fixes BZ #32996. Co-Authored-By: Adhemerval Zanella <adhemerval.zanella@linaro.org> Signed-off-by: H.J. Lu <hjl.tools@gmail.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
105 lines
3.0 KiB
ArmAsm
105 lines
3.0 KiB
ArmAsm
/* PLT trampolines. x86-64 version.
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Copyright (C) 2004-2025 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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/* 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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