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190 lines
4.9 KiB
ArmAsm
190 lines
4.9 KiB
ArmAsm
/* Thread-local storage handling in the ELF dynamic linker. ARM version.
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Copyright (C) 2006-2024 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 <rtld-global-offsets.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. r5 is
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used as the hwcap value to avoid reload after __tls_get_addr
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call. If required we will save the vector register on the slow
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path. */
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eabi_save ({r2,r3,r4,r5,ip,lr})
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push {r2,r3,r4,r5,ip,lr}
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cfi_adjust_cfa_offset (24)
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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 (r5,12)
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cfi_rel_offset (ip,16)
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cfi_rel_offset (lr,20)
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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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/* Load the hwcap to check for vector support. */
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ldr r2, 3f
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ldr r1, .Lrtld_global_ro
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0: add r2, pc, r2
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ldr r2, [r2, r1]
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ldr r5, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
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#ifdef __SOFTFP__
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tst r5, #HWCAP_ARM_VFP
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beq .Lno_vfp
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#endif
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/* Store the VFP registers. Don't use VFP instructions directly
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because this code is used in non-VFP multilibs. */
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#define VFP_STACK_REQ (32*8 + 8)
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sub sp, sp, VFP_STACK_REQ
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cfi_adjust_cfa_offset (VFP_STACK_REQ)
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mov r3, sp
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.inst 0xeca30b20 /* vstmia r3!, {d0-d15} */
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tst r5, #HWCAP_ARM_VFPD32
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beq 4f
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.inst 0xece30b20 /* vstmia r3!, {d16-d31} */
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/* Store the floating-point status register. */
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4: .inst 0xeef12a10 /* vmrs r2, fpscr */
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str r2, [r3]
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.Lno_vfp:
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bl HIDDEN_JUMPTARGET(__tls_get_addr)
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rsb r0, r4, r0
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#ifdef __SOFTFP__
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tst r5, #HWCAP_ARM_VFP
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beq 2f
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#endif
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mov r3, sp
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.inst 0xecb30b20 /* vldmia r3!, {d0-d15} */
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tst r5, #HWCAP_ARM_VFPD32
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beq 5f
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.inst 0xecf30b20 /* vldmia r3!, {d16-d31} */
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ldr r4, [r3]
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5: .inst 0xeee14a10 /* vmsr fpscr, r4 */
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add sp, sp, VFP_STACK_REQ
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cfi_adjust_cfa_offset (-VFP_STACK_REQ)
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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,r5,ip, lr}
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cfi_adjust_cfa_offset (-20)
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cfi_restore (lr)
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cfi_restore (ip)
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cfi_restore (r5)
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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,r5,ip, 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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.hidden HIDDEN_JUMPTARGET(__tls_get_addr)
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3: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
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.Lrtld_global_ro:
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.long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
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#endif /* SHARED */
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