mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
135 lines
3.4 KiB
ArmAsm
135 lines
3.4 KiB
ArmAsm
/* Thread-local storage handling in the ELF dynamic linker. ARM version.
|
|
Copyright (C) 2006-2018 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>
|
|
#include <arm-features.h>
|
|
#include <tls.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 */
|
|
eabi_save ({r2,r3,r4,lr})
|
|
push {r2,r3,r4,lr}
|
|
cfi_adjust_cfa_offset (16)
|
|
cfi_rel_offset (r2,0)
|
|
cfi_rel_offset (r3,4)
|
|
cfi_rel_offset (r4,8)
|
|
cfi_rel_offset (lr,12)
|
|
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
|
|
bl __tls_get_addr
|
|
rsb r0, r4, r0
|
|
2:
|
|
#if ((defined (__ARM_ARCH_4T__) && defined (__THUMB_INTERWORK__)) \
|
|
|| defined (ARM_ALWAYS_BX))
|
|
pop {r2,r3,r4, lr}
|
|
cfi_adjust_cfa_offset (-16)
|
|
cfi_restore (lr)
|
|
cfi_restore (r4)
|
|
cfi_restore (r3)
|
|
cfi_restore (r2)
|
|
bx lr
|
|
#else
|
|
pop {r2,r3,r4, pc}
|
|
#endif
|
|
eabi_fnend
|
|
cfi_endproc
|
|
.size _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
|
|
#endif /* SHARED */
|