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/* Check if TLSDESC relocation preserves %rdi, %rsi and %rbx.
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
<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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