135 lines
3.4 KiB
ArmAsm
135 lines
3.4 KiB
ArmAsm
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/* Thread-local storage handling in the ELF dynamic linker. ARM version.
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Copyright (C) 2006-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <arm-features.h>
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#include <tls.h>
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#include "tlsdesc.h"
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.text
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@ emit debug information with cfi
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@ use arm-specific pseudos for unwinding itself
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CFI_SECTIONS
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.hidden _dl_tlsdesc_return
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.global _dl_tlsdesc_return
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.type _dl_tlsdesc_return,#function
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cfi_startproc
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eabi_fnstart
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.align 2
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_dl_tlsdesc_return:
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ldr r0, [r0]
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BX (lr)
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eabi_fnend
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cfi_endproc
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.size _dl_tlsdesc_return, .-_dl_tlsdesc_return
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.hidden _dl_tlsdesc_undefweak
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.global _dl_tlsdesc_undefweak
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.type _dl_tlsdesc_undefweak,#function
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cfi_startproc
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eabi_fnstart
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.align 2
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_dl_tlsdesc_undefweak:
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GET_TLS (r1)
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rsb r0, r0, #0
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BX (lr)
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cfi_endproc
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eabi_fnend
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.size _dl_tlsdesc_undefweak, .-_dl_tlsdesc_undefweak
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#ifdef SHARED
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.hidden _dl_tlsdesc_dynamic
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.global _dl_tlsdesc_dynamic
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.type _dl_tlsdesc_dynamic,#function
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/*
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The assembly code that follows is a rendition of the following
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C code, hand-optimized a little bit.
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ptrdiff_t
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_dl_tlsdesc_dynamic(struct tlsdesc *tdp)
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{
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struct tlsdesc_dynamic_arg *td = tdp->argument.pointer;
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dtv_t *dtv = (dtv_t *)THREAD_DTV();
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if (__builtin_expect (td->gen_count <= dtv[0].counter
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&& dtv[td->tlsinfo.ti_module].pointer.val
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!= TLS_DTV_UNALLOCATED,
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1))
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return dtv[td->tlsinfo.ti_module].pointer.val +
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td->tlsinfo.ti_offset - __builtin_thread_pointer();
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return __tls_get_addr (&td->tlsinfo) - __builtin_thread_pointer();
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}
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*/
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cfi_startproc
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eabi_fnstart
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.align 2
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_dl_tlsdesc_dynamic:
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/* Our calling convention is to clobber r0, r1 and the processor
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flags. All others that are modified must be saved */
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eabi_save ({r2,r3,r4,lr})
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push {r2,r3,r4,lr}
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cfi_adjust_cfa_offset (16)
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cfi_rel_offset (r2,0)
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cfi_rel_offset (r3,4)
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cfi_rel_offset (r4,8)
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cfi_rel_offset (lr,12)
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ldr r1, [r0] /* td */
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GET_TLS (lr)
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mov r4, r0 /* r4 = tp */
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ldr r0, [r0]
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ldr r2, [r1, #8] /* gen_count */
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ldr r3, [r0]
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cmp r2, r3
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bhi 1f
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ldr r3, [r1]
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#ifndef ARM_NO_INDEX_REGISTER
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ldr r2, [r0, r3, lsl #3]
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#else
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add lr, r0, r3, lsl #3
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ldr r2, [lr]
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#endif
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cmn r2, #1
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ittt ne
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ldrne r3, [r1, #4]
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addne r3, r2, r3
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rsbne r0, r4, r3
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bne 2f
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1: mov r0, r1
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bl __tls_get_addr
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rsb r0, r4, r0
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2:
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#if ((defined (__ARM_ARCH_4T__) && defined (__THUMB_INTERWORK__)) \
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|| defined (ARM_ALWAYS_BX))
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pop {r2,r3,r4, lr}
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cfi_adjust_cfa_offset (-16)
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cfi_restore (lr)
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cfi_restore (r4)
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cfi_restore (r3)
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cfi_restore (r2)
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bx lr
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#else
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pop {r2,r3,r4, pc}
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#endif
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eabi_fnend
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cfi_endproc
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.size _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
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#endif /* SHARED */
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