mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 09:43:32 +08:00
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>
52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
/* x86-64 PLT dl-trampoline state macros.
|
|
Copyright (C) 2024 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#if (STATE_SAVE_ALIGNMENT % 16) != 0
|
|
# error STATE_SAVE_ALIGNMENT must be multiple of 16
|
|
#endif
|
|
|
|
#if (STATE_SAVE_OFFSET % STATE_SAVE_ALIGNMENT) != 0
|
|
# error STATE_SAVE_OFFSET must be multiple of STATE_SAVE_ALIGNMENT
|
|
#endif
|
|
|
|
#if DL_RUNTIME_RESOLVE_REALIGN_STACK
|
|
/* Local stack area before jumping to function address: RBX. */
|
|
# define LOCAL_STORAGE_AREA 8
|
|
# define BASE rbx
|
|
# ifdef USE_FXSAVE
|
|
/* Use fxsave to save XMM registers. */
|
|
# define REGISTER_SAVE_AREA (512 + STATE_SAVE_OFFSET)
|
|
# if (REGISTER_SAVE_AREA % 16) != 0
|
|
# error REGISTER_SAVE_AREA must be multiple of 16
|
|
# endif
|
|
# endif
|
|
#else
|
|
# ifndef USE_FXSAVE
|
|
# error USE_FXSAVE must be defined
|
|
# endif
|
|
/* Use fxsave to save XMM registers. */
|
|
# define REGISTER_SAVE_AREA (512 + STATE_SAVE_OFFSET + 8)
|
|
/* Local stack area before jumping to function address: All saved
|
|
registers. */
|
|
# define LOCAL_STORAGE_AREA REGISTER_SAVE_AREA
|
|
# define BASE rsp
|
|
# if (REGISTER_SAVE_AREA % 16) != 8
|
|
# error REGISTER_SAVE_AREA must be odd multiple of 8
|
|
# endif
|
|
#endif
|