[PATCH v2] LoongArch: Add support for TLS Descriptors

mengqinggang mengqinggang@loongson.cn
Mon Mar 11 08:45:11 GMT 2024


Thanks,  I will first complete the gcc patch as soon as possible.


在 2024/3/8 下午10:10, Adhemerval Zanella Netto 写道:
>
> On 08/03/24 04:53, mengqinggang wrote:
>> Thanks a lot for the review! A new v3 version patch has been sent.
>> https://sourceware.org/pipermail/libc-alpha/2024-March/155204.html
>>
>>
>> And some reply below.
>>
>>
>  From the gcc enablement patch it seems that you are using the aarch64
> ABI naming, -mtls-dialect={desc,trad}.  So I would suggest to check if
> there is no regression with my patch to enable TLS descriptor for
> -mtls=desc [1].
>
> You might also extend the testing to check for possible vector register
> wrong save/restore, as I did to check for arm32 ones [2] (check
> the sysdeps/arm/tst-gnu2-tls2.h).
>
> Also, I think this patch should be pushed only after gcc enablement
> is installed.
>
>
> [1] https://patchwork.sourceware.org/project/glibc/patch/20240229194642.3398122-4-adhemerval.zanella@linaro.org/
> [2] https://patchwork.sourceware.org/project/glibc/patch/20240229194642.3398122-3-adhemerval.zanella@linaro.org/
>
>> 在 2024/3/6 上午3:29, Adhemerval Zanella Netto 写道:
>>> On 28/02/24 22:43, mengqinggang wrote:
>>>> This is mostly based on AArch64 and RISC-V implementation.
>>>>
>>>> Add R_LARCH_TLS_DESC32 and R_LARCH_TLS_DESC64 relocations.
>>>>
>>>> For _dl_tlsdesc_dynamic function slow path, temporarily save and restore
>>>> all vector registers.
>>>> ---
>>>> Changes v1 -> v2:
>>>> - Fix vr24-vr31, xr24-xr31 typo.
>>>> - Save and restore max length float or vector registors in _dl_tlsdesc_dynamic.
>>>> - Save and restore fcsr0 in _dl_tlsdesc_dynamic.
>>>>
>>>> v1 link: https://sourceware.org/pipermail/libc-alpha/2023-December/153052.html
>>> Patch looks ok, some comments below.
>>>
>>>>    elf/elf.h                                     |   2 +
>>>>    sysdeps/loongarch/Makefile                    |   6 +
>>>>    sysdeps/loongarch/dl-link.sym                 |   1 +
>>>>    sysdeps/loongarch/dl-machine.h                |  60 ++-
>>>>    sysdeps/loongarch/dl-tls.h                    |   9 +-
>>>>    sysdeps/loongarch/dl-tlsdesc-dynamic.h        | 341 ++++++++++++++++++
>>>>    sysdeps/loongarch/dl-tlsdesc.S                |  93 +++++
>>>>    sysdeps/loongarch/dl-tlsdesc.h                |  53 +++
>>>>    sysdeps/loongarch/linkmap.h                   |   1 +
>>>>    sysdeps/loongarch/sys/asm.h                   |   1 +
>>>>    sysdeps/loongarch/sys/regdef.h                |   1 +
>>>>    sysdeps/loongarch/tlsdesc.c                   |  39 ++
>>>>    sysdeps/loongarch/tlsdesc.sym                 |  19 +
>>>>    .../unix/sysv/linux/loongarch/localplt.data   |   2 +
>>>>    14 files changed, 625 insertions(+), 3 deletions(-)
>>>>    create mode 100644 sysdeps/loongarch/dl-tlsdesc-dynamic.h
>>>>    create mode 100644 sysdeps/loongarch/dl-tlsdesc.S
>>>>    create mode 100644 sysdeps/loongarch/dl-tlsdesc.h
>>>>    create mode 100644 sysdeps/loongarch/tlsdesc.c
>>>>    create mode 100644 sysdeps/loongarch/tlsdesc.sym
>>>>
>>>> diff --git a/elf/elf.h b/elf/elf.h
>>>> index f2206e5c06..eec24ea049 100644
>>>> --- a/elf/elf.h
>>>> +++ b/elf/elf.h
>>>> @@ -4237,6 +4237,8 @@ enum
>>>>    #define R_LARCH_TLS_TPREL32    10
>>>>    #define R_LARCH_TLS_TPREL64    11
>>>>    #define R_LARCH_IRELATIVE    12
>>>> +#define R_LARCH_TLS_DESC32    13
>>>> +#define R_LARCH_TLS_DESC64    14
>>>>      /* Reserved for future relocs that the dynamic linker must understand.  */
>>>>    diff --git a/sysdeps/loongarch/Makefile b/sysdeps/loongarch/Makefile
>>>> index 43d2f583cd..181389e787 100644
>>>> --- a/sysdeps/loongarch/Makefile
>>>> +++ b/sysdeps/loongarch/Makefile
>>>> @@ -3,9 +3,15 @@ sysdep_headers += sys/asm.h
>>>>    endif
>>>>      ifeq ($(subdir),elf)
>>>> +sysdep-dl-routines += tlsdesc dl-tlsdesc
>>>>    gen-as-const-headers += dl-link.sym
>>>>    endif
>>>>    +ifeq ($(subdir),csu)
>>>> +gen-as-const-headers += tlsdesc.sym
>>>> +endif
>>>> +
>>>> +
>>>>    # LoongArch's assembler also needs to know about PIC as it changes the
>>>>    # definition of some assembler macros.
>>>>    ASFLAGS-.os += $(pic-ccflag)
>>>> diff --git a/sysdeps/loongarch/dl-link.sym b/sysdeps/loongarch/dl-link.sym
>>>> index b534968e30..fd81ef37d5 100644
>>>> --- a/sysdeps/loongarch/dl-link.sym
>>>> +++ b/sysdeps/loongarch/dl-link.sym
>>>> @@ -1,6 +1,7 @@
>>>>    #include <stddef.h>
>>>>    #include <sysdep.h>
>>>>    #include <link.h>
>>>> +#include <dl-tlsdesc.h>
>>>>      DL_SIZEOF_RG            sizeof(struct La_loongarch_regs)
>>>>    DL_SIZEOF_RV            sizeof(struct La_loongarch_retval)
>>>> diff --git a/sysdeps/loongarch/dl-machine.h b/sysdeps/loongarch/dl-machine.h
>>>> index ab81b82d95..8ca6c224f6 100644
>>>> --- a/sysdeps/loongarch/dl-machine.h
>>>> +++ b/sysdeps/loongarch/dl-machine.h
>>>> @@ -25,7 +25,7 @@
>>>>    #include <entry.h>
>>>>    #include <elf/elf.h>
>>>>    #include <sys/asm.h>
>>>> -#include <dl-tls.h>
>>>> +#include <dl-tlsdesc.h>
>>>>    #include <dl-static-tls.h>
>>>>    #include <dl-machine-rel.h>
>>>>    @@ -187,6 +187,45 @@ elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
>>>>          *addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
>>>>          break;
>>>>    +    case __WORDSIZE == 64 ? R_LARCH_TLS_DESC64 : R_LARCH_TLS_DESC32:
>>>> +      {
>>>> +    struct tlsdesc volatile *td =
>>>> +        (struct tlsdesc volatile *)addr_field;
>>>> +    if (! sym)
>>>> +      {
>>>> +        td->arg = (void*)reloc->r_addend;
>>>> +        td->entry = _dl_tlsdesc_undefweak;
>>>> +      }
>>>> +    else
>>>> +      {
>>>> +# ifndef SHARED
>>>> +        CHECK_STATIC_TLS (map, sym_map);
>>>> +# else
>>>> +        if (!TRY_STATIC_TLS (map, sym_map))
>>>> +          {
>>>> +        td->arg = _dl_make_tlsdesc_dynamic
>>>> +          (sym_map, sym->st_value + reloc->r_addend);
>>>> +# if !defined __loongarch_soft_float
>>>> +        if (SUPPORT_LASX)
>>>> +          td->entry = _dl_tlsdesc_dynamic_lasx;
>>>> +        else
>>>> +        if (SUPPORT_LSX)
>>>> +          td->entry = _dl_tlsdesc_dynamic_lsx;
>>>> +        else
>>>> +# endif
>>>> +          td->entry = _dl_tlsdesc_dynamic;
>>>> +          }
>>>> +        else
>>>> +# endif
>>>> +          {
>>>> +        td->arg = (void *)(TLS_TPREL_VALUE (sym_map, sym)
>>>> +                + reloc->r_addend);
>>>> +        td->entry = _dl_tlsdesc_return;
>>>> +          }
>>>> +      }
>>>> +    break;
>>>> +      }
>>>> +
>>>>        case R_LARCH_COPY:
>>>>          {
>>>>          if (sym == NULL)
>>>> @@ -255,6 +294,25 @@ elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
>>>>          else
>>>>        *reloc_addr = map->l_mach.plt;
>>>>        }
>>>> +  else if (__builtin_expect (r_type == R_LARCH_TLS_DESC64, 1))
>>> Use __glibc_likely here.
>>>
>>>> +    {
>>>> +      const Elf_Symndx symndx = ELFW (R_SYM) (reloc->r_info);
>>>> +      const ElfW (Sym) *symtab = (const void *)D_PTR (map, l_info[DT_SYMTAB]);
>>>> +      const ElfW (Sym) *sym = &symtab[symndx];
>>>> +      const struct r_found_version *version = NULL;
>>>> +
>>>> +      if (map->l_info[VERSYMIDX (DT_VERSYM)] != NULL)
>>>> +    {
>>>> +      const ElfW (Half) *vernum =
>>>> +        (const void *)D_PTR (map, l_info[VERSYMIDX (DT_VERSYM)]);
>>>> +      version = &map->l_versions[vernum[symndx] & 0x7fff];
>>>> +    }
>>>> +
>>>> +      /* Always initialize TLS descriptors completely, because lazy
>>>> +     initialization requires synchronization at every TLS access.  */
>>>> +      elf_machine_rela (map, scope, reloc, sym, version, reloc_addr,
>>>> +            skip_ifunc);
>>>> +    }
>>>>      else
>>>>        _dl_reloc_bad_type (map, r_type, 1);
>>>>    }
>>>> diff --git a/sysdeps/loongarch/dl-tls.h b/sysdeps/loongarch/dl-tls.h
>>>> index 29924b866d..de593c002d 100644
>>>> --- a/sysdeps/loongarch/dl-tls.h
>>>> +++ b/sysdeps/loongarch/dl-tls.h
>>>> @@ -16,6 +16,9 @@
>>>>       License along with the GNU C Library.  If not, see
>>>>       <https://www.gnu.org/licenses/>.  */
>>>>    +#ifndef _DL_TLS_H
>>>> +#define _DL_TLS_H
>>>> +
>>>>    /* Type used for the representation of TLS information in the GOT.  */
>>>>    typedef struct
>>>>    {
>>>> @@ -23,6 +26,8 @@ typedef struct
>>>>      unsigned long int ti_offset;
>>>>    } tls_index;
>>>>    +extern void *__tls_get_addr (tls_index *ti);
>>>> +
>>>>    /* The thread pointer points to the first static TLS block.  */
>>>>    #define TLS_TP_OFFSET 0
>>>>    @@ -37,10 +42,10 @@ typedef struct
>>>>    /* Compute the value for a DTPREL reloc.  */
>>>>    #define TLS_DTPREL_VALUE(sym) ((sym)->st_value - TLS_DTV_OFFSET)
>>>>    -extern void *__tls_get_addr (tls_index *ti);
>>>> -
>>> Why move the function prototype?
>>
>> Maybe just want to take it out of a bunch of macros.
>>
>>
>>>>    #define GET_ADDR_OFFSET (ti->ti_offset + TLS_DTV_OFFSET)
>>>>    #define __TLS_GET_ADDR(__ti) (__tls_get_addr (__ti) - TLS_DTV_OFFSET)
>>>>      /* Value used for dtv entries for which the allocation is delayed.  */
>>>>    #define TLS_DTV_UNALLOCATED ((void *) -1l)
>>>> +
>>>> +#endif
>>>> diff --git a/sysdeps/loongarch/dl-tlsdesc-dynamic.h b/sysdeps/loongarch/dl-tlsdesc-dynamic.h
>>>> new file mode 100644
>>>> index 0000000000..0d8c9bb991
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/dl-tlsdesc-dynamic.h
>>>> @@ -0,0 +1,341 @@
>>>> +/* Thread-local storage handling in the ELF dynamic linker.
>>>> +   LoongArch version.
>>>> +   Copyright (C) 2011-2023 Free Software Foundation, Inc.
>>> Update Copyright years to 2024.
>>>
>>>> +
>>>> +   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/>.  */
>>>> +
>>>> +#ifdef USE_LASX
>>>> +# define FRAME_SIZE (-((-13 * SZREG - 32 * SZXREG - SZFCSREG) & ALMASK))
>>>> +#elif defined USE_LSX
>>>> +# define FRAME_SIZE (-((-13 * SZREG - 32 * SZVREG - SZFCSREG) & ALMASK))
>>>> +#elif !defined __loongarch_soft_float
>>>> +# define FRAME_SIZE (-((-13 * SZREG - 24 * SZFREG - SZFCSREG) & ALMASK))
>>>> +#else
>>>> +# define FRAME_SIZE (-((-13 * SZREG) & ALMASK))
>>>> +#endif
>>> I don't have a strong opinion, but another option that might be simpler it
>>> to provide only only one _dl_tlsdesc_dynamic implementation and check the
>>> required save/restore of vector register based on hwcap value.
>>
>> The v3 patch provides only one  _dl_tlsdesc_dynamic implementation.
>>
>>
>>>> +
>>>> +#ifdef SHARED
>>>> +    /* Handler for dynamic TLS symbols.
>>>> +       Prototype:
>>>> +       _dl_tlsdesc_dynamic (tlsdesc *) ;
>>>> +
>>>> +       The second word of the descriptor points to a
>>>> +       tlsdesc_dynamic_arg structure.
>>>> +
>>>> +       Returns the offset between the thread pointer and the
>>>> +       object referenced by the argument.
>>>> +
>>>> +       ptrdiff_t
>>>> +       __attribute__ ((__regparm__ (1)))
>>> Does this attribute really make sense for loongarch?
>>
>> This line has been deleted.
>>
>>
>>>> +       _dl_tlsdesc_dynamic (struct tlsdesc *tdp)
>>>> +       {
>>>> +         struct tlsdesc_dynamic_arg *td = tdp->arg;
>>>> +         dtv_t *dtv = *(dtv_t **)((char *)__thread_pointer + TCBHEAD_DTV);
>>>> +         if (__builtin_expect (td->gen_count <= dtv[0].counter
>>> Use __glibc_unlikely or just remove the __builtin_expect for clarity.
>>>
>>>> +        && (dtv[td->tlsinfo.ti_module].pointer.val
>>>> +            != TLS_DTV_UNALLOCATED),
>>>> +        1))
>>>> +           return dtv[td->tlsinfo.ti_module].pointer.val
>>>> +        + td->tlsinfo.ti_offset
>>>> +        - __thread_pointer;
>>>> +
>>>> +         return ___tls_get_addr (&td->tlsinfo) - __thread_pointer;
>>>> +       }
>>>> +     */
>>>> +    .hidden _dl_tlsdesc_dynamic
>>>> +    .global    _dl_tlsdesc_dynamic
>>>> +    .type    _dl_tlsdesc_dynamic,%function
>>>> +    cfi_startproc
>>>> +    .align 2
>>>> +_dl_tlsdesc_dynamic:
>>>> +    /* Save just enough registers to support fast path, if we fall
>>>> +       into slow path we will save additional registers.  */
>>>> +    ADDI    sp, sp,-24
>>>> +    REG_S    t0, sp, 0
>>>> +    REG_S    t1, sp, 8
>>>> +    REG_S    t2, sp, 16
>>>> +
>>>> +    REG_L    t0, tp, -SIZE_OF_DTV      # dtv(t0) = tp + TCBHEAD_DTV dtv start
>>>> +    REG_L    a0, a0, TLSDESC_ARG      # td(a0) = tdp->arg
>>>> +    REG_L    t1, a0, TLSDESC_GEN_COUNT # t1 = td->gen_count
>>>> +    REG_L    t2, t0, DTV_COUNTER      # t2 = dtv[0].counter
>>>> +    bltu    t2, t1, Lslow
>>>> +
>>>> +    REG_L    t1, a0, TLSDESC_MODID      # t1 = td->tlsinfo.ti_module
>>>> +    slli.d    t1, t1, 3 + 1 # /* sizeof(dtv_t) == sizeof(void*) * 2 */
>>>> +    add.d    t1, t1, t0    # t1 = dtv + ti_module * sizeof(dtv_t)
>>>> +    REG_L    t1, t1, 0 # t1 = dtv[td->tlsinfo.ti_module].pointer.val
>>>> +    li.d    t2, TLS_DTV_UNALLOCATED
>>>> +    beq    t1, t2, Lslow
>>>> +    REG_L    t2, a0, TLSDESC_MODOFF # t2 = td->tlsinfo.ti_offset
>>>> +    # dtv[td->tlsinfo.ti_module].pointer.val + td->tlsinfo.ti_offset
>>>> +    add.d    a0, t1, t2
>>>> +Lret:
>>>> +    sub.d    a0, a0, tp
>>>> +    REG_L    t0, sp, 0
>>>> +    REG_L    t1, sp, 8
>>>> +    REG_L    t2, sp, 16
>>>> +    ADDI    sp, sp, 24
>>>> +    RET
>>>> +
>>>> +Lslow:
>>>> +    /* This is the slow path. We need to call __tls_get_addr() which
>>>> +       means we need to save and restore all the register that the
>>>> +       callee will trash.  */
>>>> +
>>>> +    /* Save the remaining registers that we must treat as caller save.  */
>>>> +    ADDI    sp, sp, -FRAME_SIZE
>>>> +    REG_S    ra, sp, 0 * SZREG
>>>> +    REG_S    a1, sp, 1 * SZREG
>>>> +    REG_S    a2, sp, 2 * SZREG
>>>> +    REG_S    a3, sp, 3 * SZREG
>>>> +    REG_S    a4, sp, 4 * SZREG
>>>> +    REG_S    a5, sp, 5 * SZREG
>>>> +    REG_S    a6, sp, 6 * SZREG
>>>> +    REG_S    a7, sp, 7 * SZREG
>>>> +    REG_S    t4, sp, 8 * SZREG
>>>> +    REG_S    t5, sp, 9 * SZREG
>>>> +    REG_S    t6, sp, 10 * SZREG
>>>> +    REG_S    t7, sp, 11 * SZREG
>>>> +    REG_S    t8, sp, 12 * SZREG
>>>> +
>>>> +#ifdef USE_LASX
>>>> +    xvst    xr0, sp, 13*SZREG + 0*SZXREG
>>>> +    xvst    xr1, sp, 13*SZREG + 1*SZXREG
>>>> +    xvst    xr2, sp, 13*SZREG + 2*SZXREG
>>>> +    xvst    xr3, sp, 13*SZREG + 3*SZXREG
>>>> +    xvst    xr4, sp, 13*SZREG + 4*SZXREG
>>>> +    xvst    xr5, sp, 13*SZREG + 5*SZXREG
>>>> +    xvst    xr6, sp, 13*SZREG + 6*SZXREG
>>>> +    xvst    xr7, sp, 13*SZREG + 7*SZXREG
>>>> +    xvst    xr8, sp, 13*SZREG + 8*SZXREG
>>>> +    xvst    xr9, sp, 13*SZREG + 9*SZXREG
>>>> +    xvst    xr10, sp, 13*SZREG + 10*SZXREG
>>>> +    xvst    xr11, sp, 13*SZREG + 11*SZXREG
>>>> +    xvst    xr12, sp, 13*SZREG + 12*SZXREG
>>>> +    xvst    xr13, sp, 13*SZREG + 13*SZXREG
>>>> +    xvst    xr14, sp, 13*SZREG + 14*SZXREG
>>>> +    xvst    xr15, sp, 13*SZREG + 15*SZXREG
>>>> +    xvst    xr16, sp, 13*SZREG + 16*SZXREG
>>>> +    xvst    xr17, sp, 13*SZREG + 17*SZXREG
>>>> +    xvst    xr18, sp, 13*SZREG + 18*SZXREG
>>>> +    xvst    xr19, sp, 13*SZREG + 19*SZXREG
>>>> +    xvst    xr20, sp, 13*SZREG + 20*SZXREG
>>>> +    xvst    xr21, sp, 13*SZREG + 21*SZXREG
>>>> +    xvst    xr22, sp, 13*SZREG + 22*SZXREG
>>>> +    xvst    xr23, sp, 13*SZREG + 23*SZXREG
>>>> +    xvst    xr24, sp, 13*SZREG + 24*SZXREG
>>>> +    xvst    xr25, sp, 13*SZREG + 25*SZXREG
>>>> +    xvst    xr26, sp, 13*SZREG + 26*SZXREG
>>>> +    xvst    xr27, sp, 13*SZREG + 27*SZXREG
>>>> +    xvst    xr28, sp, 13*SZREG + 28*SZXREG
>>>> +    xvst    xr29, sp, 13*SZREG + 29*SZXREG
>>>> +    xvst    xr30, sp, 13*SZREG + 30*SZXREG
>>>> +    xvst    xr31, sp, 13*SZREG + 31*SZXREG
>>>> +    # Only one physical fcsr0 register, fcsr1-fcsr3 are aliases of
>>>> +    # some fields in fcsr0
>>>> +    movfcsr2gr  t0, fcsr0
>>>> +    REG_S        t0, sp, 32*SZXREG
>>>> +#elif defined USE_LSX
>>>> +    vst    vr0, sp, 13*SZREG + 0*SZVREG
>>>> +    vst    vr1, sp, 13*SZREG + 1*SZVREG
>>>> +    vst    vr2, sp, 13*SZREG + 2*SZVREG
>>>> +    vst    vr3, sp, 13*SZREG + 3*SZVREG
>>>> +    vst    vr4, sp, 13*SZREG + 4*SZVREG
>>>> +    vst    vr5, sp, 13*SZREG + 5*SZVREG
>>>> +    vst    vr6, sp, 13*SZREG + 6*SZVREG
>>>> +    vst    vr7, sp, 13*SZREG + 7*SZVREG
>>>> +    vst    vr8, sp, 13*SZREG + 8*SZVREG
>>>> +    vst    vr9, sp, 13*SZREG + 9*SZVREG
>>>> +    vst    vr10, sp, 13*SZREG + 10*SZVREG
>>>> +    vst    vr11, sp, 13*SZREG + 11*SZVREG
>>>> +    vst    vr12, sp, 13*SZREG + 12*SZVREG
>>>> +    vst    vr13, sp, 13*SZREG + 13*SZVREG
>>>> +    vst    vr14, sp, 13*SZREG + 14*SZVREG
>>>> +    vst    vr15, sp, 13*SZREG + 15*SZVREG
>>>> +    vst    vr16, sp, 13*SZREG + 16*SZVREG
>>>> +    vst    vr17, sp, 13*SZREG + 17*SZVREG
>>>> +    vst    vr18, sp, 13*SZREG + 18*SZVREG
>>>> +    vst    vr19, sp, 13*SZREG + 19*SZVREG
>>>> +    vst    vr20, sp, 13*SZREG + 20*SZVREG
>>>> +    vst    vr21, sp, 13*SZREG + 21*SZVREG
>>>> +    vst    vr22, sp, 13*SZREG + 22*SZVREG
>>>> +    vst    vr23, sp, 13*SZREG + 23*SZVREG
>>>> +    vst    vr24, sp, 13*SZREG + 24*SZVREG
>>>> +    vst    vr25, sp, 13*SZREG + 25*SZVREG
>>>> +    vst    vr26, sp, 13*SZREG + 26*SZVREG
>>>> +    vst    vr27, sp, 13*SZREG + 27*SZVREG
>>>> +    vst    vr28, sp, 13*SZREG + 28*SZVREG
>>>> +    vst    vr29, sp, 13*SZREG + 29*SZVREG
>>>> +    vst    vr30, sp, 13*SZREG + 30*SZVREG
>>>> +    vst    vr31, sp, 13*SZREG + 31*SZVREG
>>>> +    # Only one physical fcsr0 register, fcsr1-fcsr3 are aliases of
>>>> +    # some fields in fcsr0
>>>> +    movfcsr2gr  t0, fcsr0
>>>> +    REG_S        t0, sp, 32*SZVREG
>>>> +#elif !defined __loongarch_soft_float
>>>> +    FREG_S    fa0, sp, 13*SZREG + 0*SZFREG
>>>> +    FREG_S    fa1, sp, 13*SZREG + 1*SZFREG
>>>> +    FREG_S    fa2, sp, 13*SZREG + 2*SZFREG
>>>> +    FREG_S    fa3, sp, 13*SZREG + 3*SZFREG
>>>> +    FREG_S    fa4, sp, 13*SZREG + 4*SZFREG
>>>> +    FREG_S    fa5, sp, 13*SZREG + 5*SZFREG
>>>> +    FREG_S    fa6, sp, 13*SZREG + 6*SZFREG
>>>> +    FREG_S    fa7, sp, 13*SZREG + 7*SZFREG
>>>> +    FREG_S    ft0, sp, 13*SZREG + 8*SZFREG
>>>> +    FREG_S    ft1, sp, 13*SZREG + 9*SZFREG
>>>> +    FREG_S    ft2, sp, 13*SZREG + 10*SZFREG
>>>> +    FREG_S    ft3, sp, 13*SZREG + 11*SZFREG
>>>> +    FREG_S    ft4, sp, 13*SZREG + 12*SZFREG
>>>> +    FREG_S    ft5, sp, 13*SZREG + 13*SZFREG
>>>> +    FREG_S    ft6, sp, 13*SZREG + 14*SZFREG
>>>> +    FREG_S    ft7, sp, 13*SZREG + 15*SZFREG
>>>> +    FREG_S    ft8, sp, 13*SZREG + 16*SZFREG
>>>> +    FREG_S    ft9, sp, 13*SZREG + 17*SZFREG
>>>> +    FREG_S    ft10, sp, 13*SZREG + 18*SZFREG
>>>> +    FREG_S    ft11, sp, 13*SZREG + 19*SZFREG
>>>> +    FREG_S    ft12, sp, 13*SZREG + 20*SZFREG
>>>> +    FREG_S    ft13, sp, 13*SZREG + 21*SZFREG
>>>> +    FREG_S    ft14, sp, 13*SZREG + 22*SZFREG
>>>> +    FREG_S    ft15, sp, 13*SZREG + 23*SZFREG
>>>> +    # Only one physical fcsr0 register, fcsr1-fcsr3 are aliases of
>>>> +    # some fields in fcsr0
>>>> +    movfcsr2gr  t0, fcsr0
>>>> +    REG_S        t0, sp, 24*SZFREG
>>>> +#endif /* #ifdef USE_LASX  */
>>>> +
>>>> +    bl    __tls_get_addr
>>>> +    ADDI    a0, a0, -TLS_DTV_OFFSET
>>>> +
>>>> +    REG_L    ra, sp, 0
>>>> +    REG_L    a1, sp, 1 * 8
>>>> +    REG_L    a2, sp, 2 * 8
>>>> +    REG_L    a3, sp, 3 * 8
>>>> +    REG_L    a4, sp, 4 * 8
>>>> +    REG_L    a5, sp, 5 * 8
>>>> +    REG_L    a6, sp, 6 * 8
>>>> +    REG_L    a7, sp, 7 * 8
>>>> +    REG_L    t4, sp, 8 * 8
>>>> +    REG_L    t5, sp, 9 * 8
>>>> +    REG_L    t6, sp, 10 * 8
>>>> +    REG_L    t7, sp, 11 * 8
>>>> +    REG_L    t8, sp, 12 * 8
>>>> +
>>>> +#ifdef USE_LASX
>>>> +    xvld    xr0, sp, 13*SZREG + 0*SZXREG
>>>> +    xvld    xr1, sp, 13*SZREG + 1*SZXREG
>>>> +    xvld    xr2, sp, 13*SZREG + 2*SZXREG
>>>> +    xvld    xr3, sp, 13*SZREG + 3*SZXREG
>>>> +    xvld    xr4, sp, 13*SZREG + 4*SZXREG
>>>> +    xvld    xr5, sp, 13*SZREG + 5*SZXREG
>>>> +    xvld    xr6, sp, 13*SZREG + 6*SZXREG
>>>> +    xvld    xr7, sp, 13*SZREG + 7*SZXREG
>>>> +    xvld    xr8, sp, 13*SZREG + 8*SZXREG
>>>> +    xvld    xr9, sp, 13*SZREG + 9*SZXREG
>>>> +    xvld    xr10, sp, 13*SZREG + 10*SZXREG
>>>> +    xvld    xr11, sp, 13*SZREG + 11*SZXREG
>>>> +    xvld    xr12, sp, 13*SZREG + 12*SZXREG
>>>> +    xvld    xr13, sp, 13*SZREG + 13*SZXREG
>>>> +    xvld    xr14, sp, 13*SZREG + 14*SZXREG
>>>> +    xvld    xr15, sp, 13*SZREG + 15*SZXREG
>>>> +    xvld    xr16, sp, 13*SZREG + 16*SZXREG
>>>> +    xvld    xr17, sp, 13*SZREG + 17*SZXREG
>>>> +    xvld    xr18, sp, 13*SZREG + 18*SZXREG
>>>> +    xvld    xr19, sp, 13*SZREG + 19*SZXREG
>>>> +    xvld    xr20, sp, 13*SZREG + 20*SZXREG
>>>> +    xvld    xr21, sp, 13*SZREG + 21*SZXREG
>>>> +    xvld    xr22, sp, 13*SZREG + 22*SZXREG
>>>> +    xvld    xr23, sp, 13*SZREG + 23*SZXREG
>>>> +    xvld    xr24, sp, 13*SZREG + 24*SZXREG
>>>> +    xvld    xr25, sp, 13*SZREG + 25*SZXREG
>>>> +    xvld    xr26, sp, 13*SZREG + 26*SZXREG
>>>> +    xvld    xr27, sp, 13*SZREG + 27*SZXREG
>>>> +    xvld    xr28, sp, 13*SZREG + 28*SZXREG
>>>> +    xvld    xr29, sp, 13*SZREG + 29*SZXREG
>>>> +    xvld    xr30, sp, 13*SZREG + 30*SZXREG
>>>> +    xvld    xr31, sp, 13*SZREG + 31*SZXREG
>>>> +    REG_L    t0, sp, 32*SZXREG
>>>> +    movgr2fcsr  fcsr0, t0
>>>> +#elif defined USE_LSX
>>>> +    vld    vr0, sp, 13*SZREG + 0*SZVREG
>>>> +    vld    vr1, sp, 13*SZREG + 1*SZVREG
>>>> +    vld    vr2, sp, 13*SZREG + 2*SZVREG
>>>> +    vld    vr3, sp, 13*SZREG + 3*SZVREG
>>>> +    vld    vr4, sp, 13*SZREG + 4*SZVREG
>>>> +    vld    vr5, sp, 13*SZREG + 5*SZVREG
>>>> +    vld    vr6, sp, 13*SZREG + 6*SZVREG
>>>> +    vld    vr7, sp, 13*SZREG + 7*SZVREG
>>>> +    vld    vr8, sp, 13*SZREG + 8*SZVREG
>>>> +    vld    vr9, sp, 13*SZREG + 9*SZVREG
>>>> +    vld    vr10, sp, 13*SZREG + 10*SZVREG
>>>> +    vld    vr11, sp, 13*SZREG + 11*SZVREG
>>>> +    vld    vr12, sp, 13*SZREG + 12*SZVREG
>>>> +    vld    vr13, sp, 13*SZREG + 13*SZVREG
>>>> +    vld    vr14, sp, 13*SZREG + 14*SZVREG
>>>> +    vld    vr15, sp, 13*SZREG + 15*SZVREG
>>>> +    vld    vr16, sp, 13*SZREG + 16*SZVREG
>>>> +    vld    vr17, sp, 13*SZREG + 17*SZVREG
>>>> +    vld    vr18, sp, 13*SZREG + 18*SZVREG
>>>> +    vld    vr19, sp, 13*SZREG + 19*SZVREG
>>>> +    vld    vr20, sp, 13*SZREG + 20*SZVREG
>>>> +    vld    vr21, sp, 13*SZREG + 21*SZVREG
>>>> +    vld    vr22, sp, 13*SZREG + 22*SZVREG
>>>> +    vld    vr23, sp, 13*SZREG + 23*SZVREG
>>>> +    vld    vr24, sp, 13*SZREG + 24*SZVREG
>>>> +    vld    vr25, sp, 13*SZREG + 25*SZVREG
>>>> +    vld    vr26, sp, 13*SZREG + 26*SZVREG
>>>> +    vld    vr27, sp, 13*SZREG + 27*SZVREG
>>>> +    vld    vr28, sp, 13*SZREG + 28*SZVREG
>>>> +    vld    vr29, sp, 13*SZREG + 29*SZVREG
>>>> +    vld    vr30, sp, 13*SZREG + 30*SZVREG
>>>> +    vld    vr31, sp, 13*SZREG + 31*SZVREG
>>>> +    REG_L    t0, sp, 32*SZVREG
>>>> +    movgr2fcsr  fcsr0, t0
>>>> +#elif !defined __loongarch_soft_float
>>>> +    FREG_L    fa0, sp, 13*SZREG + 0*SZFREG
>>>> +    FREG_L    fa1, sp, 13*SZREG + 1*SZFREG
>>>> +    FREG_L    fa2, sp, 13*SZREG + 2*SZFREG
>>>> +    FREG_L    fa3, sp, 13*SZREG + 3*SZFREG
>>>> +    FREG_L    fa4, sp, 13*SZREG + 4*SZFREG
>>>> +    FREG_L    fa5, sp, 13*SZREG + 5*SZFREG
>>>> +    FREG_L    fa6, sp, 13*SZREG + 6*SZFREG
>>>> +    FREG_L    fa7, sp, 13*SZREG + 7*SZFREG
>>>> +    FREG_L    ft0, sp, 13*SZREG + 8*SZFREG
>>>> +    FREG_L    ft1, sp, 13*SZREG + 9*SZFREG
>>>> +    FREG_L    ft2, sp, 13*SZREG + 10*SZFREG
>>>> +    FREG_L    ft3, sp, 13*SZREG + 11*SZFREG
>>>> +    FREG_L    ft4, sp, 13*SZREG + 12*SZFREG
>>>> +    FREG_L    ft5, sp, 13*SZREG + 13*SZFREG
>>>> +    FREG_L    ft6, sp, 13*SZREG + 14*SZFREG
>>>> +    FREG_L    ft7, sp, 13*SZREG + 15*SZFREG
>>>> +    FREG_L    ft8, sp, 13*SZREG + 16*SZFREG
>>>> +    FREG_L    ft9, sp, 13*SZREG + 17*SZFREG
>>>> +    FREG_L    ft10, sp, 13*SZREG + 18*SZFREG
>>>> +    FREG_L    ft11, sp, 13*SZREG + 19*SZFREG
>>>> +    FREG_L    ft12, sp, 13*SZREG + 20*SZFREG
>>>> +    FREG_L    ft13, sp, 13*SZREG + 21*SZFREG
>>>> +    FREG_L    ft14, sp, 13*SZREG + 22*SZFREG
>>>> +    FREG_L    ft15, sp, 13*SZREG + 23*SZFREG
>>>> +    REG_L    t0, sp, 24*SZFREG
>>>> +    movgr2fcsr  fcsr0, t0
>>>> +#endif /* #ifdef USE_LASX  */
>>>> +
>>>> +    ADDI    sp, sp, FRAME_SIZE
>>>> +    b    Lret
>>>> +    cfi_endproc
>>>> +    .size    _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
>>>> +#endif /* #ifdef SHARED  */
>>>> diff --git a/sysdeps/loongarch/dl-tlsdesc.S b/sysdeps/loongarch/dl-tlsdesc.S
>>>> new file mode 100644
>>>> index 0000000000..4a17079169
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/dl-tlsdesc.S
>>>> @@ -0,0 +1,93 @@
>>>> +/* Thread-local storage handling in the ELF dynamic linker.
>>>> +   LoongArch version.
>>>> +   Copyright (C) 2011-2023 Free Software Foundation, Inc.
>>> Update Copyright years to 2024.
>>>
>>>> +
>>>> +   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 <tls.h>
>>>> +#include "tlsdesc.h"
>>>> +
>>>> +    .text
>>>> +
>>>> +    /* Compute the thread pointer offset for symbols in the static
>>>> +       TLS block. The offset is the same for all threads.
>>>> +       Prototype:
>>>> +       _dl_tlsdesc_return (tlsdesc *);  */
>>>> +    .hidden _dl_tlsdesc_return
>>>> +    .global    _dl_tlsdesc_return
>>>> +    .type    _dl_tlsdesc_return,%function
>>>> +    cfi_startproc
>>>> +    .align 2
>>>> +_dl_tlsdesc_return:
>>>> +    REG_L  a0, a0, 8
>>>> +    RET
>>>> +    cfi_endproc
>>>> +    .size    _dl_tlsdesc_return, .-_dl_tlsdesc_return
>>>> +
>>>> +    /* Handler for undefined weak TLS symbols.
>>>> +       Prototype:
>>>> +       _dl_tlsdesc_undefweak (tlsdesc *);
>>>> +
>>>> +       The second word of the descriptor contains the addend.
>>>> +       Return the addend minus the thread pointer. This ensures
>>>> +       that when the caller adds on the thread pointer it gets back
>>>> +       the addend.  */
>>>> +    .hidden _dl_tlsdesc_undefweak
>>>> +    .global    _dl_tlsdesc_undefweak
>>>> +    .type    _dl_tlsdesc_undefweak,%function
>>>> +    cfi_startproc
>>>> +    .align  2
>>>> +_dl_tlsdesc_undefweak:
>>>> +    REG_L    a0, a0, 8
>>>> +    sub.d    a0, a0, tp
>>>> +    RET
>>>> +    cfi_endproc
>>>> +    .size    _dl_tlsdesc_undefweak, .-_dl_tlsdesc_undefweak
>>>> +
>>>> +
>>>> +#ifdef SHARED
>>>> +
>>>> +#if !defined __loongarch_soft_float
>>>> +
>>>> +#define USE_LASX
>>>> +#define _dl_tlsdesc_dynamic _dl_tlsdesc_dynamic_lasx
>>>> +#define Lret Lret_lasx
>>>> +#define Lslow Lslow_lasx
>>>> +#include "dl-tlsdesc-dynamic.h"
>>>> +#undef FRAME_SIZE
>>>> +#undef USE_LASX
>>>> +#undef _dl_tlsdesc_dynamic
>>>> +#undef Lret
>>>> +#undef Lslow
>>>> +
>>>> +#define USE_LSX
>>>> +#define _dl_tlsdesc_dynamic _dl_tlsdesc_dynamic_lsx
>>>> +#define Lret Lret_lsx
>>>> +#define Lslow Lslow_lsx
>>>> +#include "dl-tlsdesc-dynamic.h"
>>>> +#undef FRAME_SIZE
>>>> +#undef USE_LSX
>>>> +#undef _dl_tlsdesc_dynamic
>>>> +#undef Lret
>>>> +#undef Lslow
>>>> +
>>>> +#endif
>>>> +
>>>> +#include "dl-tlsdesc-dynamic.h"
>>>> +
>>>> +#endif /* #ifdef SHARED  */
>>>> diff --git a/sysdeps/loongarch/dl-tlsdesc.h b/sysdeps/loongarch/dl-tlsdesc.h
>>>> new file mode 100644
>>>> index 0000000000..988037a714
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/dl-tlsdesc.h
>>>> @@ -0,0 +1,53 @@
>>>> +/* Thread-local storage descriptor handling in the ELF dynamic linker.
>>>> +   LoongArch version.
>>>> +   Copyright (C) 2011-2023 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/>.  */
>>>> +
>>>> +#ifndef _DL_TLSDESC_H
>>>> +#define _DL_TLSDESC_H
>>>> +
>>>> +#include <dl-tls.h>
>>>> +
>>>> +/* Type used to represent a TLS descriptor in the GOT.  */
>>>> +struct tlsdesc
>>>> +{
>>>> +  ptrdiff_t (*entry) (struct tlsdesc *);
>>>> +  void *arg;
>>>> +};
>>>> +
>>>> +/* Type used as the argument in a TLS descriptor for a symbol that
>>>> +   needs dynamic TLS offsets.  */
>>>> +struct tlsdesc_dynamic_arg
>>>> +{
>>>> +  tls_index tlsinfo;
>>>> +  size_t gen_count;
>>>> +};
>>>> +
>>>> +extern ptrdiff_t attribute_hidden _dl_tlsdesc_return (struct tlsdesc *);
>>>> +extern ptrdiff_t attribute_hidden _dl_tlsdesc_undefweak (struct tlsdesc *);
>>>> +
>>>> +# ifdef SHARED
>>>> +extern void *_dl_make_tlsdesc_dynamic (struct link_map *, size_t);
>>>> +#if !defined __loongarch_soft_float
>>> Minor style, usually for single tests we use '#ifndef' and add
>>> attribute_hidden at the end of prototype.
>>>
>>>> +extern ptrdiff_t attribute_hidden _dl_tlsdesc_dynamic_lasx (struct tlsdesc *);
>>>> +extern ptrdiff_t attribute_hidden _dl_tlsdesc_dynamic_lsx (struct tlsdesc *);
>>>> +#endif
>>>> +extern ptrdiff_t attribute_hidden _dl_tlsdesc_dynamic (struct tlsdesc *);
>>>> +#endif
>>>> +
>>>> +#endif
>>>> diff --git a/sysdeps/loongarch/linkmap.h b/sysdeps/loongarch/linkmap.h
>>>> index 4d8737ee7f..9b1773634c 100644
>>>> --- a/sysdeps/loongarch/linkmap.h
>>>> +++ b/sysdeps/loongarch/linkmap.h
>>>> @@ -19,4 +19,5 @@
>>>>    struct link_map_machine
>>>>    {
>>>>      ElfW (Addr) plt; /* Address of .plt.  */
>>>> +  void *tlsdesc_table;    /* Address of TLS descriptor hash table.  */
>>>>    };
>>>> diff --git a/sysdeps/loongarch/sys/asm.h b/sysdeps/loongarch/sys/asm.h
>>>> index 51521a7eb4..23c1d12914 100644
>>>> --- a/sysdeps/loongarch/sys/asm.h
>>>> +++ b/sysdeps/loongarch/sys/asm.h
>>>> @@ -25,6 +25,7 @@
>>>>    /* Macros to handle different pointer/register sizes for 32/64-bit code.  */
>>>>    #define SZREG 8
>>>>    #define SZFREG 8
>>>> +#define SZFCSREG 4
>>>>    #define SZVREG 16
>>>>    #define SZXREG 32
>>>>    #define REG_L ld.d
>>>> diff --git a/sysdeps/loongarch/sys/regdef.h b/sysdeps/loongarch/sys/regdef.h
>>>> index f61ee25b25..80ce3e9c00 100644
>>>> --- a/sysdeps/loongarch/sys/regdef.h
>>>> +++ b/sysdeps/loongarch/sys/regdef.h
>>>> @@ -97,6 +97,7 @@
>>>>    #define fcc5 $fcc5
>>>>    #define fcc6 $fcc6
>>>>    #define fcc7 $fcc7
>>>> +#define fcsr0 $fcsr0
>>>>      #define vr0 $vr0
>>>>    #define vr1 $vr1
>>>> diff --git a/sysdeps/loongarch/tlsdesc.c b/sysdeps/loongarch/tlsdesc.c
>>>> new file mode 100644
>>>> index 0000000000..a357e7619f
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/tlsdesc.c
>>>> @@ -0,0 +1,39 @@
>>>> +/* Manage TLS descriptors.  AArch64 version.
>>>> +
>>>> +   Copyright (C) 2011-2023 Free Software Foundation, Inc.
>>> Update Copyright years to 2024 and remove the 'AArch64'.
>>>
>>>
>>>> +
>>>> +   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 <ldsodefs.h>
>>>> +#include <tls.h>
>>>> +#include <dl-tlsdesc.h>
>>>> +#include <dl-unmap-segments.h>
>>>> +#include <tlsdeschtab.h>
>>>> +
>>>> +/* Unmap the dynamic object, but also release its TLS descriptor table
>>>> +   if there is one.  */
>>>> +
>>>> +void
>>>> +_dl_unmap (struct link_map *map)
>>>> +{
>>>> +  _dl_unmap_segments (map);
>>>> +
>>>> +#ifdef SHARED
>>>> +  if (map->l_mach.tlsdesc_table)
>>>> +    htab_delete (map->l_mach.tlsdesc_table);
>>>> +#endif
>>>> +}
>>>> diff --git a/sysdeps/loongarch/tlsdesc.sym b/sysdeps/loongarch/tlsdesc.sym
>>>> new file mode 100644
>>>> index 0000000000..bcab218631
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/tlsdesc.sym
>>>> @@ -0,0 +1,19 @@
>>>> +#include <stddef.h>
>>>> +#include <sysdep.h>
>>>> +#include <tls.h>
>>>> +#include <link.h>
>>>> +#include <dl-tlsdesc.h>
>>>> +
>>>> +--
>>>> +
>>>> +-- Abuse tls.h macros to derive offsets relative to the thread register.
>>>> +
>>>> +TLSDESC_ARG        offsetof(struct tlsdesc, arg)
>>>> +TLSDESC_GEN_COUNT    offsetof(struct tlsdesc_dynamic_arg, gen_count)
>>>> +TLSDESC_MODID        offsetof(struct tlsdesc_dynamic_arg, tlsinfo.ti_module)
>>>> +TLSDESC_MODOFF        offsetof(struct tlsdesc_dynamic_arg, tlsinfo.ti_offset)
>>>> +TCBHEAD_DTV        offsetof(tcbhead_t, dtv)
>>>> +DTV_COUNTER        offsetof(dtv_t, counter)
>>>> +TLS_DTV_UNALLOCATED    TLS_DTV_UNALLOCATED
>>>> +TLS_DTV_OFFSET        TLS_DTV_OFFSET
>>>> +SIZE_OF_DTV        sizeof(tcbhead_t)
>>>> diff --git a/sysdeps/unix/sysv/linux/loongarch/localplt.data b/sysdeps/unix/sysv/linux/loongarch/localplt.data
>>>> index 547b1c1b7f..ec32e6d13f 100644
>>>> --- a/sysdeps/unix/sysv/linux/loongarch/localplt.data
>>>> +++ b/sysdeps/unix/sysv/linux/loongarch/localplt.data
>>>> @@ -5,3 +5,5 @@ libc.so: calloc
>>>>    libc.so: free
>>>>    libc.so: malloc
>>>>    libc.so: realloc
>>>> +# The dynamic loader needs __tls_get_addr for TLS.
>>>> +ld.so: __tls_get_addr



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