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- /* Check if TLSDESC relocation preserves %rdi, %rsi and %rbx.
- Copyright (C) 2024-2026 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 <sysdep.h>
- /* On AVX512 machines, OFFSET == 40 caused _dl_tlsdesc_dynamic_xsavec
- to clobber %rdi, %rsi and %rbx. On Intel AVX CPUs, the state size
- is 960 bytes and this test didn't fail. It may be due to the unused
- last 128 bytes. On AMD AVX CPUs, the state size is 832 bytes and
- this test might fail without the fix. */
- #ifndef OFFSET
- # define OFFSET 40
- #endif
- .text
- .p2align 4
- .globl apply_tls
- .type apply_tls, @function
- apply_tls:
- cfi_startproc
- _CET_ENDBR
- pushq %rbp
- cfi_def_cfa_offset (16)
- cfi_offset (6, -16)
- movdqu (%RDI_LP), %xmm0
- lea tls_var1@TLSDESC(%rip), %RAX_LP
- mov %RSP_LP, %RBP_LP
- cfi_def_cfa_register (6)
- /* Align stack to 64 bytes. */
- and $-64, %RSP_LP
- sub $OFFSET, %RSP_LP
- pushq %rbx
- /* Set %ebx to 0xbadbeef. */
- movl $0xbadbeef, %ebx
- movl $0xbadbeef, %esi
- movq %rdi, saved_rdi(%rip)
- movq %rsi, saved_rsi(%rip)
- call *tls_var1@TLSCALL(%RAX_LP)
- /* Check if _dl_tlsdesc_dynamic preserves %rdi, %rsi and %rbx. */
- cmpq saved_rdi(%rip), %rdi
- jne L(hlt)
- cmpq saved_rsi(%rip), %rsi
- jne L(hlt)
- cmpl $0xbadbeef, %ebx
- jne L(hlt)
- add %fs:0, %RAX_LP
- movups %xmm0, 32(%RAX_LP)
- movdqu 16(%RDI_LP), %xmm1
- mov %RAX_LP, %RBX_LP
- movups %xmm1, 48(%RAX_LP)
- lea 32(%RBX_LP), %RAX_LP
- pop %rbx
- leave
- cfi_def_cfa (7, 8)
- ret
- L(hlt):
- hlt
- cfi_endproc
- .size apply_tls, .-apply_tls
- .hidden tls_var1
- .globl tls_var1
- .section .tbss,"awT",@nobits
- .align 16
- .type tls_var1, @object
- .size tls_var1, 3200
- tls_var1:
- .zero 3200
- .local saved_rdi
- .comm saved_rdi,8,8
- .local saved_rsi
- .comm saved_rsi,8,8
- .section .note.GNU-stack,"",@progbits
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