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/* Thread-local storage handling in the ELF dynamic linker. ARM version.
Copyright (C) 2006-2024 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/>. */
#include <sysdep.h>
#include <arm-features.h>
#include <tls.h>
#include <rtld-global-offsets.h>
#include "tlsdesc.h"
.text
@ emit debug information with cfi
@ use arm-specific pseudos for unwinding itself
CFI_SECTIONS
.hidden _dl_tlsdesc_return
.global _dl_tlsdesc_return
.type _dl_tlsdesc_return,#function
cfi_startproc
eabi_fnstart
.align 2
_dl_tlsdesc_return:
ldr r0, [r0]
BX (lr)
eabi_fnend
cfi_endproc
.size _dl_tlsdesc_return, .-_dl_tlsdesc_return
.hidden _dl_tlsdesc_undefweak
.global _dl_tlsdesc_undefweak
.type _dl_tlsdesc_undefweak,#function
cfi_startproc
eabi_fnstart
.align 2
_dl_tlsdesc_undefweak:
GET_TLS (r1)
rsb r0, r0, #0
BX (lr)
cfi_endproc
eabi_fnend
.size _dl_tlsdesc_undefweak, .-_dl_tlsdesc_undefweak
#ifdef SHARED
.hidden _dl_tlsdesc_dynamic
.global _dl_tlsdesc_dynamic
.type _dl_tlsdesc_dynamic,#function
/*
The assembly code that follows is a rendition of the following
C code, hand-optimized a little bit.
ptrdiff_t
_dl_tlsdesc_dynamic(struct tlsdesc *tdp)
{
struct tlsdesc_dynamic_arg *td = tdp->argument.pointer;
dtv_t *dtv = (dtv_t *)THREAD_DTV();
if (__builtin_expect (td->gen_count <= dtv[0].counter
&& dtv[td->tlsinfo.ti_module].pointer.val
!= TLS_DTV_UNALLOCATED,
1))
return dtv[td->tlsinfo.ti_module].pointer.val +
td->tlsinfo.ti_offset - __builtin_thread_pointer();
return __tls_get_addr (&td->tlsinfo) - __builtin_thread_pointer();
}
*/
cfi_startproc
eabi_fnstart
.align 2
_dl_tlsdesc_dynamic:
/* Our calling convention is to clobber r0, r1 and the processor
flags. All others that are modified must be saved. r5 is
used as the hwcap value to avoid reload after __tls_get_addr
call. If required we will save the vector register on the slow
path. */
eabi_save ({r2,r3,r4,r5,ip,lr})
push {r2,r3,r4,r5,ip,lr}
cfi_adjust_cfa_offset (24)
cfi_rel_offset (r2,0)
cfi_rel_offset (r3,4)
cfi_rel_offset (r4,8)
cfi_rel_offset (r5,12)
cfi_rel_offset (ip,16)
cfi_rel_offset (lr,20)
ldr r1, [r0] /* td */
GET_TLS (lr)
mov r4, r0 /* r4 = tp */
ldr r0, [r0]
ldr r2, [r1, #8] /* gen_count */
ldr r3, [r0]
cmp r2, r3
bhi 1f
ldr r3, [r1]
#ifndef ARM_NO_INDEX_REGISTER
ldr r2, [r0, r3, lsl #3]
#else
add lr, r0, r3, lsl #3
ldr r2, [lr]
#endif
cmn r2, #1
ittt ne
ldrne r3, [r1, #4]
addne r3, r2, r3
rsbne r0, r4, r3
bne 2f
1: mov r0, r1
/* Load the hwcap to check for vector support. */
ldr r2, 3f
ldr r1, .Lrtld_global_ro
0: add r2, pc, r2
ldr r2, [r2, r1]
ldr r5, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
#ifdef __SOFTFP__
tst r5, #HWCAP_ARM_VFP
beq .Lno_vfp
#endif
/* Store the VFP registers. Don't use VFP instructions directly
because this code is used in non-VFP multilibs. */
#define VFP_STACK_REQ (32*8 + 8)
sub sp, sp, VFP_STACK_REQ
cfi_adjust_cfa_offset (VFP_STACK_REQ)
mov r3, sp
.inst 0xeca30b20 /* vstmia r3!, {d0-d15} */
tst r5, #HWCAP_ARM_VFPD32
beq 4f
.inst 0xece30b20 /* vstmia r3!, {d16-d31} */
/* Store the floating-point status register. */
4: .inst 0xeef12a10 /* vmrs r2, fpscr */
str r2, [r3]
.Lno_vfp:
bl __tls_get_addr
rsb r0, r4, r0
#ifdef __SOFTFP__
tst r5, #HWCAP_ARM_VFP
beq 2f
#endif
mov r3, sp
.inst 0xecb30b20 /* vldmia r3!, {d0-d15} */
tst r5, #HWCAP_ARM_VFPD32
beq 5f
.inst 0xecf30b20 /* vldmia r3!, {d16-d31} */
ldr r4, [r3]
5: .inst 0xeee14a10 /* vmsr fpscr, r4 */
add sp, sp, VFP_STACK_REQ
cfi_adjust_cfa_offset (-VFP_STACK_REQ)
2:
#if ((defined (__ARM_ARCH_4T__) && defined (__THUMB_INTERWORK__)) \
|| defined (ARM_ALWAYS_BX))
pop {r2,r3,r4,r5,ip, lr}
cfi_adjust_cfa_offset (-20)
cfi_restore (lr)
cfi_restore (ip)
cfi_restore (r5)
cfi_restore (r4)
cfi_restore (r3)
cfi_restore (r2)
bx lr
#else
pop {r2,r3,r4,r5,ip, pc}
#endif
eabi_fnend
cfi_endproc
.size _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
3: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
.Lrtld_global_ro:
.long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
#endif /* SHARED */
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