Re: [PATCH v5 04/13] LoongArch: ABI Implementation

[caiyinyu <caiyinyu@loongson.cn>]

> +  /* Check for unexpected PLT reloc type.  */
> +  if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
> +    {
> +      if (__glibc_unlikely (map->l_mach.plt == 0))
> +    {
> +      if (l_addr)
> +        *reloc_addr += l_addr;
> +    }
> +      else
> +    *reloc_addr = map->l_mach.plt;
> +    }
> +  else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>
> This is a design issue of ifunc for many ports.
> Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
> .rela.plt, then you can remove this branch.
>
>
> *Definitely, for riscv, x86 and aarch64..., there are **R_*_IRELATIVEs 
> in their **.rela.plt.*
>
> *But I don't understand why "Ideally R_*_IRELATIVE relocations are 
> only in .rela.dyn"?*
>
> *Could you explain it?*
>
> *or we just keep it now?
> *
>
> *Thanks.*

See https://maskray.me/blog/2021-01-18-gnu-indirect-function
".rela.dyn vs .rela.plt"

Conceptually .rela.plt should only have potentially lazy resolved
relocations. IRELATIVE are always eager, so .rela.plt isn't applicable.
In the early days things were a bit messy in the implementation, so
some early ports adopting ifunc may use .rela.plt .
GNU ld's PowerPC port apperas to do the right thing.
All lld supported ports do the right thing.


*Fixed. Now R_*_IRELATIVE relocations are only in .rela.dyn.*

*new binutils:*

*https://github.com/loongson/binutils-gdb/tree/dev/new_reloc*

*Thanks a lot.*




在 2022/6/11 上午4:26, Fangrui Song 写道:
>
> On 2022-06-10, caiyinyu wrote:
>> +
>> +#define elf_machine_type_class(type)                \
>> +  ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT    \
>> +     || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32)    \
>> +     || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32)    \
>> +     || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32)    \
>> +     || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64)    \
>> +     || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64)    \
>> +     || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64)))    \
>>
>> Placing TLS dynamic relocations in the ELF_RTYPE_CLASS_PLT list
>> seems an unneeded hack for many ports.  Can you check does loongarch
>> really need them?
>>
>> *Removed*.
>
> Thanks.
>
>> *>>>>>>>>>>>>>>>*
>>
>> diff --git a/sysdeps/loongarch/dl-machine.h 
>> b/sysdeps/loongarch/dl-machine.h
>> index 3beaaee117..500fe71a7e 100644
>> --- a/sysdeps/loongarch/dl-machine.h
>> +++ b/sysdeps/loongarch/dl-machine.h
>> @@ -47,13 +47,7 @@
>>  #define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
>>
>>  #define elf_machine_type_class(type) \
>> -  ((ELF_RTYPE_CLASS_PLT *((type) == ELF_MACHINE_JMP_SLOT \
>> -     || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32)   \
>> -     || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32)   \
>> -     || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32)    \
>> -     || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64)   \
>> -     || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64)   \
>> -     || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64)))  \
>> +  ((ELF_RTYPE_CLASS_PLT *((type) == ELF_MACHINE_JMP_SLOT)) \
>>     | (ELF_RTYPE_CLASS_COPY *((type) == R_LARCH_COPY)))
>>
>>  #define ELF_MACHINE_NO_REL 1
>>
>> *<<<<<<<<<<<<<<<<<<*
>>
>> *
>> *
>>
>> +#define RTLD_START \
>> +  asm(".text\n\
>> +      " _RTLD_PROLOGUE (ENTRY_POINT) "\
>> +      .cfi_label .Ldummy   \n\
>> +      " CFI_UNDEFINED (1) "   \n\
>> +      or    $a0, $sp, $zero   \n\
>> +      bl    _dl_start   \n\
>> +      # Stash user entry point in s0.   \n\
>> +      or    $s0, $v0, $zero   \n\
>> +      # Load the original argument count.   \n\
>> +      ld.d    $a1, $sp, 0   \n\
>> +      # Call _dl_init (struct link_map *main_map, int argc, char 
>> **argv, \
>> +               char **env)    \n\
>> +      la    $a0, _rtld_local   \n\
>> +      ld.d    $a0, $a0, 0   \n\
>> +      addi.d    $a2, $sp, 8   \n\
>> +      slli.d    $a3, $a1, 3   \n\
>> +      add.d    $a3, $a3, $a2   \n\
>> +      addi.d    $a3, $a3, 8   \n\
>>
>> The _dl_init seems much more complex than the riscv counterpart.
>>
>> *There is no need to simplify further.*
>>
>
> Thanks.
>
>>>>>>>>>>>>>>>>>>>>
>>
>> loongarch:
>>
>>  96       # Call _dl_init (struct link_map *main_map, int argc, char 
>> **argv, \
>>  97                        char **env)    \n\
>> * 98        la        $a0, _rtld_local \n\
>>  99        ld.d      $a0, $a0, 0   \n\ *
>> *100       addi.d    $a2, $sp, 8   \n\ **
>> **101       slli.d    $a3, $a1, 3   \n\ **
>> **102       add.d     $a3, $a3, $a2   \n\ **
>> **103       addi.d    $a3, $a3, 8   \n\*
>> 104       # Stash the stack pointer in s1.\n\
>>
>> riscv:
>>
>> 112         # Call _dl_init (struct link_map *main_map, int argc, 
>> char **argv, char **env) \n\
>> *113         " STRINGXP (REG_L) " a0, _rtld_local\n\*
>> *114         add a2, sp, " STRINGXP (SZREG) "\n\**
>> **115         sll a3, a1, " STRINGXP (PTRLOG) "\n\**
>> **116         add a3, a3, a2\n\**
>> **117         add a3, a3, " STRINGXP (SZREG) "\n\*
>> 118         # Stash the stack pointer in s1.\n\
>>
>> <<<<<<<<<<<<<<
>>
>>
>>> +      # Adjust $sp for 16-aligned   \n\
>>> +      srli.d  $t0, $sp, 4   \n\
>>> +      slli.d  $t0, $t0, 4   \n\
>>> +      ori    $t1, $sp, 0   \n\
>>> +      addi.d  $sp, $t0, -32   \n\
>>> +      st.d    $t1, $sp, 24   \n\
>>
>> Seems too complex.
>>
>> *Fixed.*
>
> Thanks.
>
>> *>>>>>>>>>>>>>>>>>>>*
>>
>> *diff --git a/sysdeps/loongarch/dl-machine.h 
>> b/sysdeps/loongarch/dl-machine.h
>> index 500fe71a7e..6ec9a403d3 100644
>> --- a/sysdeps/loongarch/dl-machine.h
>> +++ b/sysdeps/loongarch/dl-machine.h
>> @@ -101,16 +101,15 @@ static inline ElfW (Addr) elf_machine_dynamic 
>> (void)
>>        slli.d   $a3, $a1, 3   \n\
>>        add.d    $a3, $a3, $a2   \n\
>>        addi.d   $a3, $a3, 8   \n\
>> +      # Stash the stack pointer in s1.\n\
>> +      or       $s1, $sp, $zero \n\
>>        # Adjust $sp for 16-aligned   \n\
>> -      srli.d  $t0, $sp, 4   \n\
>> -      slli.d  $t0, $t0, 4   \n\
>> -      ori      $t1, $sp, 0   \n\
>> -      addi.d  $sp, $t0, -32   \n\
>> -      st.d     $t1, $sp, 24   \n\
>> +      bstrins.d        $sp, $zero, 3, 0  \n\
>>        # Call the function to run the initializers.   \n\
>>        bl       _dl_init   \n\
>> +      # Restore the stack pointer for _start.\n\
>> +      or       $sp, $s1, $zero  \n\
>>        # Pass our finalizer function to _start.   \n\
>> -      ld.d    $sp, $sp, 24   \n\
>>        la       $a0, _dl_fini   \n\
>>        # Jump to the user entry point.   \n\
>>        jirl     $zero, $s0, 0   \n\
>> *
>>
>> *<<<<<<<<<<<<<<<<<<*
>>
>>
>> +static inline void __attribute__ ((always_inline))
>> +elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
>> +          const ElfW (Rela) * reloc,
>> +          const ElfW (Sym) * sym,
>>
>> Seems excess space after `*`
>>
>> *Fixed all same problems.*
>
> Thanks.
>
>> +  /* Check for unexpected PLT reloc type.  */
>> +  if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
>> +    {
>> +      if (__glibc_unlikely (map->l_mach.plt == 0))
>> +    {
>> +      if (l_addr)
>> +        *reloc_addr += l_addr;
>> +    }
>> +      else
>> +    *reloc_addr = map->l_mach.plt;
>> +    }
>> +  else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>>
>> This is a design issue of ifunc for many ports.
>> Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
>> .rela.plt, then you can remove this branch.
>>
>>
>> *Definitely, for riscv, x86 and aarch64..., there are 
>> **R_*_IRELATIVEs in their **.rela.plt.*
>>
>> *But I don't understand why "Ideally R_*_IRELATIVE relocations are 
>> only in .rela.dyn"?*
>>
>> *Could you explain it?*
>>
>> *or we just keep it now?
>> *
>>
>> *Thanks.*
>
> See https://maskray.me/blog/2021-01-18-gnu-indirect-function
> ".rela.dyn vs .rela.plt"
>
> Conceptually .rela.plt should only have potentially lazy resolved
> relocations. IRELATIVE are always eager, so .rela.plt isn't applicable.
> In the early days things were a bit messy in the implementation, so
> some early ports adopting ifunc may use .rela.plt .
> GNU ld's PowerPC port apperas to do the right thing.
> All lld supported ports do the right thing.
>
>> *
>> *
>>
>> 在 2022/6/6 上午7:55, Fangrui Song 写道:
>>> On 2022-06-01, caiyinyu wrote:
>>>> ---
>>>> sysdeps/loongarch/__longjmp.S                |  52 ++++
>>>> sysdeps/loongarch/bits/endianness.h          |  11 +
>>>> sysdeps/loongarch/bits/link.h                |  58 ++++
>>>> sysdeps/loongarch/bits/setjmp.h              |  42 +++
>>>> sysdeps/loongarch/bsd-_setjmp.c              |   1 +
>>>> sysdeps/loongarch/bsd-setjmp.c               |   1 +
>>>> sysdeps/loongarch/dl-machine.h               | 307 +++++++++++++++++++
>>>> sysdeps/loongarch/dl-trampoline.S            |  91 ++++++
>>>> sysdeps/loongarch/jmpbuf-offsets.h           |  22 ++
>>>> sysdeps/loongarch/jmpbuf-unwind.h            |  45 +++
>>>> sysdeps/loongarch/ldsodefs.h                 |  41 +++
>>>> sysdeps/loongarch/linkmap.h                  |  22 ++
>>>> sysdeps/loongarch/machine-gmon.h             |  37 +++
>>>> sysdeps/loongarch/setjmp.S                   |  66 ++++
>>>> sysdeps/loongarch/sotruss-lib.c              |  50 +++
>>>> sysdeps/loongarch/start.S                    |  67 ++++
>>>> sysdeps/loongarch/sys/asm.h                  |  59 ++++
>>>> sysdeps/loongarch/tst-audit.h                |  23 ++
>>>> sysdeps/unix/sysv/linux/loongarch/ldconfig.h |  26 ++
>>>> 19 files changed, 1021 insertions(+)
>>>> create mode 100644 sysdeps/loongarch/__longjmp.S
>>>> create mode 100644 sysdeps/loongarch/bits/endianness.h
>>>> create mode 100644 sysdeps/loongarch/bits/link.h
>>>> create mode 100644 sysdeps/loongarch/bits/setjmp.h
>>>> create mode 100644 sysdeps/loongarch/bsd-_setjmp.c
>>>> create mode 100644 sysdeps/loongarch/bsd-setjmp.c
>>>> create mode 100644 sysdeps/loongarch/dl-machine.h
>>>> create mode 100644 sysdeps/loongarch/dl-trampoline.S
>>>> create mode 100644 sysdeps/loongarch/jmpbuf-offsets.h
>>>> create mode 100644 sysdeps/loongarch/jmpbuf-unwind.h
>>>> create mode 100644 sysdeps/loongarch/ldsodefs.h
>>>> create mode 100644 sysdeps/loongarch/linkmap.h
>>>> create mode 100644 sysdeps/loongarch/machine-gmon.h
>>>> create mode 100644 sysdeps/loongarch/setjmp.S
>>>> create mode 100644 sysdeps/loongarch/sotruss-lib.c
>>>> create mode 100644 sysdeps/loongarch/start.S
>>>> create mode 100644 sysdeps/loongarch/sys/asm.h
>>>> create mode 100644 sysdeps/loongarch/tst-audit.h
>>>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>>>
>>>> diff --git a/sysdeps/loongarch/__longjmp.S 
>>>> b/sysdeps/loongarch/__longjmp.S
>>>> new file mode 100644
>>>> index 0000000000..b7690dd94f
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/__longjmp.S
>>>> @@ -0,0 +1,52 @@
>>>> +/* longjmp.
>>>> +   Copyright (C) 2022 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 <sys/asm.h>
>>>> +
>>>> +ENTRY (__longjmp)
>>>> +    REG_L ra, a0, 0*SZREG
>>>> +    REG_L sp, a0, 1*SZREG
>>>> +    REG_L x,  a0, 2*SZREG
>>>> +    REG_L fp, a0, 3*SZREG
>>>> +    REG_L s0, a0, 4*SZREG
>>>> +    REG_L s1, a0, 5*SZREG
>>>> +    REG_L s2, a0, 6*SZREG
>>>> +    REG_L s3, a0, 7*SZREG
>>>> +    REG_L s4, a0, 8*SZREG
>>>> +    REG_L s5, a0, 9*SZREG
>>>> +    REG_L s6, a0, 10*SZREG
>>>> +    REG_L s7, a0, 11*SZREG
>>>> +    REG_L s8, a0, 12*SZREG
>>>> +
>>>> +#ifndef __loongarch_soft_float
>>>> +    FREG_L $f24, a0, 13*SZREG + 0*SZFREG
>>>> +    FREG_L $f25, a0, 13*SZREG + 1*SZFREG
>>>> +    FREG_L $f26, a0, 13*SZREG + 2*SZFREG
>>>> +    FREG_L $f27, a0, 13*SZREG + 3*SZFREG
>>>> +    FREG_L $f28, a0, 13*SZREG + 4*SZFREG
>>>> +    FREG_L $f29, a0, 13*SZREG + 5*SZFREG
>>>> +    FREG_L $f30, a0, 13*SZREG + 6*SZFREG
>>>> +    FREG_L $f31, a0, 13*SZREG + 7*SZFREG
>>>> +#endif
>>>> +
>>>> +    sltui    a0,a1,1
>>>> +    ADD    a0, a0, a1     # a0 = (a1 == 0) ? 1 : a1
>>>> +    jirl    zero,ra,0
>>>> +
>>>> +END (__longjmp)
>>>> diff --git a/sysdeps/loongarch/bits/endianness.h 
>>>> b/sysdeps/loongarch/bits/endianness.h
>>>> new file mode 100644
>>>> index 0000000000..7290be7b18
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/bits/endianness.h
>>>> @@ -0,0 +1,11 @@
>>>> +#ifndef _BITS_ENDIANNESS_H
>>>> +#define _BITS_ENDIANNESS_H 1
>>>> +
>>>> +#ifndef _BITS_ENDIAN_H
>>>> +#error "Never use <bits/endianness.h> directly; include <endian.h> 
>>>> instead."
>>>> +#endif
>>>> +
>>>> +/* LoongArch is little-endian.  */
>>>> +#define __BYTE_ORDER __LITTLE_ENDIAN
>>>> +
>>>> +#endif /* bits/endianness.h */
>>>> diff --git a/sysdeps/loongarch/bits/link.h 
>>>> b/sysdeps/loongarch/bits/link.h
>>>> new file mode 100644
>>>> index 0000000000..4df09989cb
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/bits/link.h
>>>> @@ -0,0 +1,58 @@
>>>> +/* Machine-specific declarations for dynamic linker interface.
>>>> +   Copyright (C) 2022 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 _LINK_H
>>>> +#error "Never include <bits/link.h> directly; use <link.h> instead."
>>>> +#endif
>>>> +
>>>> +typedef struct La_loongarch_regs
>>>> +{
>>>> +  unsigned long int lr_reg[8]; /* a0 - a7 */
>>>> +  double lr_fpreg[8];           /* fa0 - fa7 */
>>>> +  unsigned long int lr_ra;
>>>> +  unsigned long int lr_sp;
>>>> +} La_loongarch_regs;
>>>> +
>>>> +/* Return values for calls from PLT on LoongArch.  */
>>>> +typedef struct La_loongarch_retval
>>>> +{
>>>> +  unsigned long int lrv_a0;
>>>> +  unsigned long int lrv_a1;
>>>> +  double lrv_fa0;
>>>> +  double lrv_fa1;
>>>> +} La_loongarch_retval;
>>>> +
>>>> +__BEGIN_DECLS
>>>> +
>>>> +extern ElfW (Addr) la_loongarch_gnu_pltenter (ElfW (Sym) * __sym,
>>>> +                          unsigned int __ndx,
>>>> +                          uintptr_t *__refcook,
>>>> +                          uintptr_t *__defcook,
>>>> +                          La_loongarch_regs *__regs,
>>>> +                          unsigned int *__flags,
>>>> +                          const char *__symname,
>>>> +                          long int *__framesizep);
>>>> +extern unsigned int la_loongarch_gnu_pltexit (ElfW (Sym) * __sym,
>>>> +                          unsigned int __ndx,
>>>> +                          uintptr_t *__refcook,
>>>> +                          uintptr_t *__defcook,
>>>> +                          const La_loongarch_regs *__inregs,
>>>> +                          La_loongarch_retval *__outregs,
>>>> +                          const char *__symname);
>>>> +
>>>> +__END_DECLS
>>>> diff --git a/sysdeps/loongarch/bits/setjmp.h 
>>>> b/sysdeps/loongarch/bits/setjmp.h
>>>> new file mode 100644
>>>> index 0000000000..8b323ad2b6
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/bits/setjmp.h
>>>> @@ -0,0 +1,42 @@
>>>> +/* Define the machine-dependent type `jmp_buf'.
>>>> +   Copyright (C) 2022 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 _LOONGARCH_BITS_SETJMP_H
>>>> +#define _LOONGARCH_BITS_SETJMP_H
>>>> +
>>>> +typedef struct __jmp_buf_internal_tag
>>>> +{
>>>> +  /* Program counter.  */
>>>> +  long int __pc;
>>>> +  /* Stack pointer.  */
>>>> +  long int __sp;
>>>> +  /* Reserved */
>>>> +  long int __x;
>>>> +  /* Frame pointer.  */
>>>> +  long int __fp;
>>>> +  /* Callee-saved registers.  */
>>>> +  long int __regs[9];
>>>> +
>>>> +#ifndef __loongarch_soft_float
>>>> +  /* Callee-saved floating point registers.  */
>>>> +  double __fpregs[8];
>>>> +#endif
>>>> +
>>>> +} __jmp_buf[1];
>>>> +
>>>> +#endif /* _LOONGARCH_BITS_SETJMP_H */
>>>> diff --git a/sysdeps/loongarch/bsd-_setjmp.c 
>>>> b/sysdeps/loongarch/bsd-_setjmp.c
>>>> new file mode 100644
>>>> index 0000000000..32f49441c3
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/bsd-_setjmp.c
>>>> @@ -0,0 +1 @@
>>>> +/* _setjmp is implemented in setjmp.S.  */
>>>> diff --git a/sysdeps/loongarch/bsd-setjmp.c 
>>>> b/sysdeps/loongarch/bsd-setjmp.c
>>>> new file mode 100644
>>>> index 0000000000..45fd802aac
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/bsd-setjmp.c
>>>> @@ -0,0 +1 @@
>>>> +/* setjmp is implemented in setjmp.S.  */
>>>> diff --git a/sysdeps/loongarch/dl-machine.h 
>>>> b/sysdeps/loongarch/dl-machine.h
>>>> new file mode 100644
>>>> index 0000000000..4e19ad9319
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/dl-machine.h
>>>> @@ -0,0 +1,307 @@
>>>> +/* Machine-dependent ELF dynamic relocation inline functions.
>>>> +   Copyright (C) 2022 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_machine_h
>>>> +#define dl_machine_h
>>>> +
>>>> +#define ELF_MACHINE_NAME "LoongArch"
>>>> +
>>>> +#include <entry.h>
>>>> +#include <elf/elf.h>
>>>> +#include <sys/asm.h>
>>>> +#include <dl-tls.h>
>>>> +#include <dl-static-tls.h>
>>>> +#include <dl-machine-rel.h>
>>>> +
>>>> +#ifndef _RTLD_PROLOGUE
>>>> +# define _RTLD_PROLOGUE(entry)                    \
>>>> +    ".globl\t" __STRING (entry) "\n\t"            \
>>>> +    ".type\t" __STRING (entry) ", @function\n\t"        \
>>>> +    CFI_STARTPROC "\n"                    \
>>>> +    __STRING (entry) ":\n"
>>>> +#endif
>>>> +
>>>> +#ifndef _RTLD_EPILOGUE
>>>> +# define _RTLD_EPILOGUE(entry)                    \
>>>> +    CFI_ENDPROC "\n\t"                    \
>>>> +    ".size\t" __STRING (entry) ", . - " __STRING (entry) "\n"
>>>> +#endif
>>>> +
>>>> +#define ELF_MACHINE_JMP_SLOT R_LARCH_JUMP_SLOT
>>>> +#define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
>>>> +
>>>> +#define elf_machine_type_class(type)                \
>>>> +  ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT    \
>>>> +     || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32)    \
>>>> +     || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32)    \
>>>> +     || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32)    \
>>>> +     || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64)    \
>>>> +     || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64)    \
>>>> +     || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64)))    \
>>>
>>> Placing TLS dynamic relocations in the ELF_RTYPE_CLASS_PLT list
>>> seems an unneeded hack for many ports.  Can you check does loongarch
>>> really need them?
>>>
>>>> +   | (ELF_RTYPE_CLASS_COPY * ((type) == R_LARCH_COPY)))
>>>> +
>>>> +#define ELF_MACHINE_NO_REL 1
>>>> +#define ELF_MACHINE_NO_RELA 0
>>>> +
>>>> +/* Return nonzero iff ELF header is compatible with the running 
>>>> host.  */
>>>> +static inline int
>>>> +elf_machine_matches_host (const ElfW (Ehdr) * ehdr)
>>>> +{
>>>> +  /* We can only run LoongArch binaries.  */
>>>> +  if (ehdr->e_machine != EM_LOONGARCH)
>>>> +    return 0;
>>>> +
>>>> +  return 1;
>>>> +}
>>>> +
>>>> +/* Return the run-time load address of the shared object. */
>>>> +static inline ElfW (Addr) elf_machine_load_address (void)
>>>> +{
>>>> +  extern const ElfW(Ehdr) __ehdr_start attribute_hidden;
>>>> +  return (ElfW(Addr)) &__ehdr_start;
>>>> +}
>>>> +
>>>> +/* Return the link-time address of _DYNAMIC.  */
>>>> +static inline ElfW (Addr) elf_machine_dynamic (void)
>>>> +{
>>>> +  extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
>>>> +  return (ElfW(Addr)) _DYNAMIC - elf_machine_load_address ();
>>>> +}
>>>> +
>>>> +/* Initial entry point code for the dynamic linker.
>>>> +   The C function `_dl_start' is the real entry point;
>>>> +   its return value is the user program's entry point.  */
>>>> +
>>>> +#define RTLD_START \
>>>> +  asm(".text\n\
>>>> +      " _RTLD_PROLOGUE (ENTRY_POINT) "\
>>>> +      .cfi_label .Ldummy   \n\
>>>> +      " CFI_UNDEFINED (1) "   \n\
>>>> +      or    $a0, $sp, $zero   \n\
>>>> +      bl    _dl_start   \n\
>>>> +      # Stash user entry point in s0.   \n\
>>>> +      or    $s0, $v0, $zero   \n\
>>>> +      # Load the original argument count.   \n\
>>>> +      ld.d    $a1, $sp, 0   \n\
>>>> +      # Call _dl_init (struct link_map *main_map, int argc, char 
>>>> **argv, \
>>>> +               char **env)    \n\
>>>> +      la    $a0, _rtld_local   \n\
>>>> +      ld.d    $a0, $a0, 0   \n\
>>>> +      addi.d    $a2, $sp, 8   \n\
>>>> +      slli.d    $a3, $a1, 3   \n\
>>>> +      add.d    $a3, $a3, $a2   \n\
>>>> +      addi.d    $a3, $a3, 8   \n\
>>>
>>> The _dl_init seems much more complex than the riscv counterpart.
>>>
>>>> +      # Adjust $sp for 16-aligned \n\
>>>> +      srli.d  $t0, $sp, 4   \n\
>>>> +      slli.d  $t0, $t0, 4   \n\
>>>> +      ori    $t1, $sp, 0   \n\
>>>> +      addi.d  $sp, $t0, -32   \n\
>>>> +      st.d    $t1, $sp, 24   \n\
>>>
>>> Seems too complex.
>>>
>>>> +      # Call the function to run the initializers.   \n\
>>>> +      bl    _dl_init   \n\
>>>> +      # Pass our finalizer function to _start.   \n\
>>>> +      ld.d    $sp, $sp, 24   \n\
>>>> +      la    $a0, _dl_fini   \n\
>>>> +      # Jump to the user entry point.   \n\
>>>> +      jirl    $zero, $s0, 0   \n\
>>>> +      " _RTLD_EPILOGUE (ENTRY_POINT) "\
>>>> +      .previous");
>>>> +
>>>> +/* Names of the architecture-specific auditing callback 
>>>> functions.  */
>>>> +#define ARCH_LA_PLTENTER loongarch_gnu_pltenter
>>>> +#define ARCH_LA_PLTEXIT loongarch_gnu_pltexit
>>>> +
>>>> +/* Bias .got.plt entry by the offset requested by the PLT header.  */
>>>> +#define elf_machine_plt_value(map, reloc, value) (value)
>>>> +
>>>> +static inline ElfW (Addr)
>>>> +elf_machine_fixup_plt (struct link_map *map, lookup_t t,
>>>> +             const ElfW (Sym) * refsym, const ElfW (Sym) * sym,
>>>> +             const ElfW (Rela) * reloc, ElfW (Addr) * reloc_addr,
>>>> +             ElfW (Addr) value)
>>>> +{
>>>> +  return *reloc_addr = value;
>>>> +}
>>>> +
>>>> +#endif /* !dl_machine_h */
>>>> +
>>>> +#ifdef RESOLVE_MAP
>>>> +
>>>> +/* Perform a relocation described by R_INFO at the location 
>>>> pointed to
>>>> +   by RELOC_ADDR.  SYM is the relocation symbol specified by 
>>>> R_INFO and
>>>> +   MAP is the object containing the reloc.  */
>>>> +
>>>> +static inline void __attribute__ ((always_inline))
>>>> +elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
>>>> +          const ElfW (Rela) * reloc,
>>>> +          const ElfW (Sym) * sym,
>>>
>>> Seems excess space after `*`
>>>
>>>> +          const struct r_found_version *version,
>>>> +          void *const reloc_addr, int skip_ifunc)
>>>> +{
>>>> +  ElfW (Addr) r_info = reloc->r_info;
>>>> +  const unsigned long int r_type = ELFW (R_TYPE) (r_info);
>>>> +  ElfW (Addr) *addr_field = (ElfW (Addr) *) reloc_addr;
>>>> +  const ElfW (Sym) *const __attribute__ ((unused)) refsym = sym;
>>>> +  struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, 
>>>> version, r_type);
>>>> +  ElfW (Addr) value = 0;
>>>> +  if (sym_map != NULL)
>>>> +    value = SYMBOL_ADDRESS (sym_map, sym, true) + reloc->r_addend;
>>>> +
>>>> +  if (sym != NULL
>>>> +      && __glibc_unlikely (ELFW (ST_TYPE) (sym->st_info) == 
>>>> STT_GNU_IFUNC)
>>>> +      && __glibc_likely (sym->st_shndx != SHN_UNDEF)
>>>> +      && __glibc_likely (!skip_ifunc))
>>>> +    value = ((ElfW (Addr) (*) (int)) value) (GLRO (dl_hwcap));
>>>> +
>>>> +  switch (r_type)
>>>> +    {
>>>> +#ifndef RTLD_BOOTSTRAP
>>>> +    case __WORDSIZE == 64 ? R_LARCH_TLS_DTPMOD64:
>>>> +    R_LARCH_TLS_DTPMOD32:
>>>> +      if (sym_map)
>>>> +    *addr_field = sym_map->l_tls_modid;
>>>> +      break;
>>>
>>> I know many ports do `if (sym_map)` but that seems (a) a workaround 
>>> for possibly
>>> GNU ld bugs or (b) unneeded cargo cult.
>>>
>>> The check should better be removed.
>>>
>>> This applies to various TLS dynamic relocations below.
>>>
>>>> +
>>>> +    case __WORDSIZE == 64 ? R_LARCH_TLS_DTPREL64:
>>>> +    R_LARCH_TLS_DTPREL32:
>>>> +      if (sym != NULL)
>>>> +    *addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend;
>>>> +      break;
>>>> +
>>>> +    case __WORDSIZE == 64 ? R_LARCH_TLS_TPREL64:
>>>> +    R_LARCH_TLS_TPREL32:
>>>> +      if (sym != NULL)
>>>> +    {
>>>> +      CHECK_STATIC_TLS (map, sym_map);
>>>> +      *addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
>>>> +    }
>>>> +      break;
>>>> +
>>>> +    case R_LARCH_COPY:
>>>> +      {
>>>> +      if (sym == NULL)
>>>> +        /* This can happen in trace mode if an object could not be
>>>> +           found.  */
>>>> +        break;
>>>> +      if (__glibc_unlikely (sym->st_size > refsym->st_size)
>>>> +          || (__glibc_unlikely (sym->st_size < refsym->st_size)
>>>> +            && GLRO(dl_verbose)))
>>>> +      {
>>>> +        const char *strtab;
>>>> +
>>>> +        strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
>>>> +        _dl_error_printf ("\
>>>> +%s: Symbol `%s' has different size in shared object, consider 
>>>> re-linking\n",
>>>> +        rtld_progname ?: "<program name unknown>",
>>>> +        strtab + refsym->st_name);
>>>> +      }
>>>> +      memcpy (reloc_addr, (void *) value,
>>>> +          MIN (sym->st_size, refsym->st_size));
>>>> +        break;
>>>> +      }
>>>> +#endif
>>>> +
>>>> +#if !defined RTLD_BOOTSTRAP
>>>> +    case R_LARCH_RELATIVE:
>>>> +      *addr_field = map->l_addr + reloc->r_addend;
>>>> +      break;
>>>> +#endif
>>>
>>> I think this is copied from riscv but its relocation code is probably
>>> not the best reference.  sysdeps/m68k/dl-machine.h may be one of the
>>> better implementations for the relocation switch table.
>>>
>>> In RTLD_BOOTSTRAP mode, only two relocations (GLOB_DAT/JMP_SLOT) are
>>> needed in this function.  There should be none of NONE, RELATIVE,
>>> IRELATIVE, absolute relocation types, etc (RELATIVE is handled
>>> elsewhere).
>>>
>>> GNU ld, in the presence of a bug, may produce spurious NONE 
>>> relocations.
>>> Not handling NONE can catch some bugs.
>>>
>>>> +    case R_LARCH_JUMP_SLOT:
>>>> +    case __WORDSIZE == 64 ? R_LARCH_64:
>>>> +    R_LARCH_32:
>>>> +      *addr_field = value;
>>>> +      break;
>>>> +
>>>> +    case R_LARCH_IRELATIVE:
>>>> +      value = map->l_addr + reloc->r_addend;
>>>> +      if (__glibc_likely (!skip_ifunc))
>>>> +    value = ((ElfW (Addr) (*) (void)) value) ();
>>>> +      *addr_field = value;
>>>> +      break;
>>>> +
>>>> +    case R_LARCH_NONE:
>>>> +      break;
>>>> +
>>>> +    default:
>>>> +      _dl_reloc_bad_type (map, r_type, 0);
>>>> +      break;
>>>> +    }
>>>> +}
>>>> +
>>>> +static inline void __attribute__ ((always_inline))
>>>> +elf_machine_rela_relative (ElfW (Addr) l_addr, const ElfW (Rela) * 
>>>> reloc,
>>>> +               void *const reloc_addr)
>>>> +{
>>>> +  *(ElfW (Addr) *) reloc_addr = l_addr + reloc->r_addend;
>>>> +}
>>>> +
>>>> +static inline void __attribute__ ((always_inline))
>>>> +elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem 
>>>> *scope[],
>>>> +              ElfW (Addr) l_addr,
>>>> +              const ElfW (Rela) * reloc, int skip_ifunc)
>>>> +{
>>>> +  ElfW (Addr) *const reloc_addr = (void *) (l_addr + 
>>>> reloc->r_offset);
>>>> +  const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
>>>> +
>>>> +  /* Check for unexpected PLT reloc type.  */
>>>> +  if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
>>>> +    {
>>>> +      if (__glibc_unlikely (map->l_mach.plt == 0))
>>>> +    {
>>>> +      if (l_addr)
>>>> +        *reloc_addr += l_addr;
>>>> +    }
>>>> +      else
>>>> +    *reloc_addr = map->l_mach.plt;
>>>> +    }
>>>> +  else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>>>
>>> This is a design issue of ifunc for many ports.
>>> Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
>>> .rela.plt, then you can remove this branch.
>>>
>>>> +    {
>>>> +      ElfW (Addr) *value = (void *) (l_addr + reloc->r_addend);
>>>> +      if (__glibc_likely (!skip_ifunc))
>>>> +    value = (ElfW (Addr) *) ((ElfW (Addr) (*) (void)) value) ();
>>>> +      *reloc_addr = (ElfW (Addr)) value;
>>>> +    }
>>>> +  else
>>>> +    _dl_reloc_bad_type (map, r_type, 1);
>>>> +}
>>>> +
>>>> +/* Set up the loaded object described by L so its stub function
>>>> +   will jump to the on-demand fixup code __dl_runtime_resolve. */
>>>> +
>>>> +static inline int __attribute__ ((always_inline))
>>>> +elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem 
>>>> *scope[],
>>>> +               int lazy, int profile)
>>>> +{
>>>> +#ifndef RTLD_BOOTSTRAP
>>>> +  /* If using PLTs, fill in the first two entries of .got.plt. */
>>>> +  if (l->l_info[DT_JMPREL])
>>>> +    {
>>>> +      extern void _dl_runtime_resolve (void)
>>>> +    __attribute__ ((visibility ("hidden")));
>>>> +      ElfW (Addr) *gotplt = (ElfW (Addr) *) D_PTR (l, 
>>>> l_info[DT_PLTGOT]);
>>>> +      gotplt[0] = (ElfW (Addr)) & _dl_runtime_resolve;
>>>> +      gotplt[1] = (ElfW (Addr)) l;
>>>> +    }
>>>> +#endif
>>>> +
>>>> +  return lazy;
>>>> +}
>>>> +
>>>> +#endif /* RESOLVE_MAP */
>>>> diff --git a/sysdeps/loongarch/dl-trampoline.S 
>>>> b/sysdeps/loongarch/dl-trampoline.S
>>>> new file mode 100644
>>>> index 0000000000..eb610392f6
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/dl-trampoline.S
>>>> @@ -0,0 +1,91 @@
>>>> +/* PLT trampolines.
>>>> +   Copyright (C) 2022 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 <sys/asm.h>
>>>> +
>>>> +/* Assembler veneer called from the PLT header code for lazy loading.
>>>> +   The PLT header passes its own args in t0-t2.  */
>>>> +
>>>> +#ifdef __loongarch_soft_float
>>>> +# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))
>>>> +#else
>>>> +# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))
>>>> +#endif
>>>> +
>>>> +ENTRY (_dl_runtime_resolve)
>>>> +
>>>> +    /* Save arguments to stack. */
>>>> +    ADDI    sp, sp, -FRAME_SIZE
>>>> +
>>>> +    REG_S    ra, sp, 9*SZREG
>>>> +    REG_S    a0, sp, 1*SZREG
>>>> +    REG_S    a1, sp, 2*SZREG
>>>> +    REG_S    a2, sp, 3*SZREG
>>>> +    REG_S    a3, sp, 4*SZREG
>>>> +    REG_S    a4, sp, 5*SZREG
>>>> +    REG_S    a5, sp, 6*SZREG
>>>> +    REG_S    a6, sp, 7*SZREG
>>>> +    REG_S    a7, sp, 8*SZREG
>>>> +
>>>> +#ifndef __loongarch_soft_float
>>>> +    FREG_S    fa0, sp, 10*SZREG + 0*SZFREG
>>>> +    FREG_S    fa1, sp, 10*SZREG + 1*SZFREG
>>>> +    FREG_S    fa2, sp, 10*SZREG + 2*SZFREG
>>>> +    FREG_S    fa3, sp, 10*SZREG + 3*SZFREG
>>>> +    FREG_S    fa4, sp, 10*SZREG + 4*SZFREG
>>>> +    FREG_S    fa5, sp, 10*SZREG + 5*SZFREG
>>>> +    FREG_S    fa6, sp, 10*SZREG + 6*SZFREG
>>>> +    FREG_S    fa7, sp, 10*SZREG + 7*SZFREG
>>>> +#endif
>>>> +
>>>> +    /* Update .got.plt and obtain runtime address of callee */
>>>> +    SLLI    a1, t1, 1
>>>> +    or    a0, t0, zero
>>>> +    ADD    a1, a1, t1
>>>> +    la    a2, _dl_fixup
>>>> +    jirl    ra, a2, 0
>>>> +    or    t1, v0, zero
>>>> +
>>>> +    /* Restore arguments from stack. */
>>>> +    REG_L    ra, sp, 9*SZREG
>>>> +    REG_L    a0, sp, 1*SZREG
>>>> +    REG_L    a1, sp, 2*SZREG
>>>> +    REG_L    a2, sp, 3*SZREG
>>>> +    REG_L    a3, sp, 4*SZREG
>>>> +    REG_L    a4, sp, 5*SZREG
>>>> +    REG_L    a5, sp, 6*SZREG
>>>> +    REG_L    a6, sp, 7*SZREG
>>>> +    REG_L    a7, sp, 8*SZREG
>>>> +
>>>> +#ifndef __loongarch_soft_float
>>>> +    FREG_L    fa0, sp, 10*SZREG + 0*SZFREG
>>>> +    FREG_L    fa1, sp, 10*SZREG + 1*SZFREG
>>>> +    FREG_L    fa2, sp, 10*SZREG + 2*SZFREG
>>>> +    FREG_L    fa3, sp, 10*SZREG + 3*SZFREG
>>>> +    FREG_L    fa4, sp, 10*SZREG + 4*SZFREG
>>>> +    FREG_L    fa5, sp, 10*SZREG + 5*SZFREG
>>>> +    FREG_L    fa6, sp, 10*SZREG + 6*SZFREG
>>>> +    FREG_L    fa7, sp, 10*SZREG + 7*SZFREG
>>>> +#endif
>>>> +
>>>> +    ADDI    sp, sp, FRAME_SIZE
>>>> +
>>>> +    /* Invoke the callee. */
>>>> +    jirl        zero, t1, 0
>>>> +END (_dl_runtime_resolve)
>>>> diff --git a/sysdeps/loongarch/jmpbuf-offsets.h 
>>>> b/sysdeps/loongarch/jmpbuf-offsets.h
>>>> new file mode 100644
>>>> index 0000000000..a4b8ea690e
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/jmpbuf-offsets.h
>>>> @@ -0,0 +1,22 @@
>>>> +/* Private macros for accessing __jmp_buf contents.
>>>> +   Copyright (C) 2022 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 <jmpbuf-unwind.h>
>>>> +
>>>> +/* Helper for generic ____longjmp_chk().  */
>>>> +#define JB_FRAME_ADDRESS(buf) ((void *) _jmpbuf_sp (buf))
>>>> diff --git a/sysdeps/loongarch/jmpbuf-unwind.h 
>>>> b/sysdeps/loongarch/jmpbuf-unwind.h
>>>> new file mode 100644
>>>> index 0000000000..6fa509151d
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/jmpbuf-unwind.h
>>>> @@ -0,0 +1,45 @@
>>>> +/* Examine __jmp_buf for unwinding frames.
>>>> +   Copyright (C) 2022 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 <setjmp.h>
>>>> +#include <stdint.h>
>>>> +#include <unwind.h>
>>>> +#include <sysdep.h>
>>>> +
>>>> +/* Test if longjmp to JMPBUF would unwind the frame
>>>> +   containing a local variable at ADDRESS.  */
>>>> +#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
>>>> +  ((void *) (address) < (void *) demangle ((jmpbuf)[0].__sp))
>>>> +
>>>> +#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
>>>> +  _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA 
>>>> (_context), _adj)
>>>> +
>>>> +static inline uintptr_t __attribute__ ((unused)) _jmpbuf_sp 
>>>> (__jmp_buf regs)
>>>> +{
>>>> +  uintptr_t sp = regs[0].__sp;
>>>> +#ifdef PTR_DEMANGLE
>>>> +  PTR_DEMANGLE (sp);
>>>> +#endif
>>>> +  return sp;
>>>> +}
>>>> +
>>>> +#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
>>>> +  ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
>>>> +
>>>> +/* We use the normal longjmp for unwinding.  */
>>>> +#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
>>>> diff --git a/sysdeps/loongarch/ldsodefs.h 
>>>> b/sysdeps/loongarch/ldsodefs.h
>>>> new file mode 100644
>>>> index 0000000000..36b1b25b9f
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/ldsodefs.h
>>>> @@ -0,0 +1,41 @@
>>>> +/* Run-time dynamic linker data structures for loaded ELF shared 
>>>> objects.
>>>> +   Copyright (C) 2022 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 _LOONGARCH_LDSODEFS_H
>>>> +#define _LOONGARCH_LDSODEFS_H 1
>>>> +
>>>> +#include <elf.h>
>>>> +
>>>> +struct La_loongarch_regs;
>>>> +struct La_loongarch_retval;
>>>> +
>>>> +#define ARCH_PLTENTER_MEMBERS \
>>>> +  ElfW (Addr) (*loongarch_gnu_pltenter) (ElfW (Sym) *, unsigned 
>>>> int, \
>>>> +                     uintptr_t *, uintptr_t *, \
>>>> +                     const struct La_loongarch_regs *, \
>>>> +                     unsigned int *, const char *name, \
>>>> +                     long int *framesizep);
>>>> +
>>>> +#define ARCH_PLTEXIT_MEMBERS \
>>>> +  unsigned int (*loongarch_gnu_pltexit) (ElfW (Sym) *, unsigned 
>>>> int, \
>>>> +        uintptr_t *, uintptr_t *, const struct La_loongarch_regs *, \
>>>> +        struct La_loongarch_retval *, const char *);
>>>> +
>>>> +#include_next <ldsodefs.h>
>>>> +
>>>> +#endif
>>>> diff --git a/sysdeps/loongarch/linkmap.h b/sysdeps/loongarch/linkmap.h
>>>> new file mode 100644
>>>> index 0000000000..bbba73ed70
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/linkmap.h
>>>> @@ -0,0 +1,22 @@
>>>> +/* Definition of link_map_machine.
>>>> +   Copyright (C) 2022 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/>. */
>>>> +
>>>> +struct link_map_machine
>>>> +{
>>>> +  ElfW (Addr) plt; /* Address of .plt.  */
>>>> +};
>>>> diff --git a/sysdeps/loongarch/machine-gmon.h 
>>>> b/sysdeps/loongarch/machine-gmon.h
>>>> new file mode 100644
>>>> index 0000000000..4a3cdd964e
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/machine-gmon.h
>>>> @@ -0,0 +1,37 @@
>>>> +/* LoongArch definitions for profiling support.
>>>> +   Copyright (C) 2022 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/>. */
>>>> +
>>>> +/* Accept 'frompc' address as argument from the function that calls
>>>> +   _mcount for profiling.  Use  __builtin_return_address (0)
>>>> +   for the 'selfpc' address.  */
>>>> +
>>>> +#include <sysdep.h>
>>>> +
>>>> +static void mcount_internal (unsigned long int frompc,
>>>> +                 unsigned long int selfpc);
>>>> +
>>>> +#define _MCOUNT_DECL(frompc, selfpc) \
>>>> +  static inline void mcount_internal (unsigned long int frompc, \
>>>> +                      unsigned long int selfpc)
>>>> +
>>>> +#define MCOUNT \
>>>> +  void _mcount (void *frompc) \
>>>> +  { \
>>>> +    mcount_internal ((unsigned long int) frompc, \
>>>> +             (unsigned long int) RETURN_ADDRESS (0)); \
>>>> +  }
>>>> diff --git a/sysdeps/loongarch/setjmp.S b/sysdeps/loongarch/setjmp.S
>>>> new file mode 100644
>>>> index 0000000000..b93ae2f5da
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/setjmp.S
>>>> @@ -0,0 +1,66 @@
>>>> +/* setjmp for LoongArch.
>>>> +   Copyright (C) 2022 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 <sys/asm.h>
>>>> +
>>>> +ENTRY (_setjmp)
>>>> +    li.w        a1,0
>>>> +    b        __sigsetjmp
>>>> +END (_setjmp)
>>>> +
>>>> +ENTRY (setjmp)
>>>> +    li.w        a1,1
>>>> +END (setjmp)
>>>> +
>>>> +ENTRY (__sigsetjmp)
>>>> +    REG_S ra, a0, 0*SZREG
>>>> +    REG_S sp, a0, 1*SZREG
>>>> +    REG_S x,  a0, 2*SZREG
>>>> +    REG_S fp, a0, 3*SZREG
>>>> +    REG_S s0, a0, 4*SZREG
>>>> +    REG_S s1, a0, 5*SZREG
>>>> +    REG_S s2, a0, 6*SZREG
>>>> +    REG_S s3, a0, 7*SZREG
>>>> +    REG_S s4, a0, 8*SZREG
>>>> +    REG_S s5, a0, 9*SZREG
>>>> +    REG_S s6, a0, 10*SZREG
>>>> +    REG_S s7, a0, 11*SZREG
>>>> +    REG_S s8, a0, 12*SZREG
>>>> +
>>>> +#ifndef __loongarch_soft_float
>>>> +    FREG_S $f24, a0, 13*SZREG + 0*SZFREG
>>>> +    FREG_S $f25, a0, 13*SZREG + 1*SZFREG
>>>> +    FREG_S $f26, a0, 13*SZREG + 2*SZFREG
>>>> +    FREG_S $f27, a0, 13*SZREG + 3*SZFREG
>>>> +    FREG_S $f28, a0, 13*SZREG + 4*SZFREG
>>>> +    FREG_S $f29, a0, 13*SZREG + 5*SZFREG
>>>> +    FREG_S $f30, a0, 13*SZREG + 6*SZFREG
>>>> +    FREG_S $f31, a0, 13*SZREG + 7*SZFREG
>>>> +#endif
>>>> +
>>>> +#if !IS_IN (libc) && IS_IN(rtld)
>>>> +    li.w        v0, 0
>>>> +    jirl        zero,ra,0
>>>> +#else
>>>> +    b        __sigjmp_save
>>>> +#endif
>>>> +END (__sigsetjmp)
>>>> +
>>>> +hidden_def (__sigsetjmp)
>>>> +weak_alias (_setjmp, __GI__setjmp)
>>>> diff --git a/sysdeps/loongarch/sotruss-lib.c 
>>>> b/sysdeps/loongarch/sotruss-lib.c
>>>> new file mode 100644
>>>> index 0000000000..5b15f4815a
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/sotruss-lib.c
>>>> @@ -0,0 +1,50 @@
>>>> +/* Override generic sotruss-lib.c to define actual functions for 
>>>> LoongArch.
>>>> +   Copyright (C) 2022 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/>. */
>>>> +
>>>> +#define HAVE_ARCH_PLTENTER
>>>> +#define HAVE_ARCH_PLTEXIT
>>>> +
>>>> +#include <elf/sotruss-lib.c>
>>>> +
>>>> +ElfW (Addr)
>>>> +la_loongarch_gnu_pltenter (ElfW (Sym) * sym __attribute__ ((unused)),
>>>> +               unsigned int ndx __attribute__ ((unused)),
>>>> +               uintptr_t *refcook, uintptr_t *defcook,
>>>> +               La_loongarch_regs *regs, unsigned int *flags,
>>>> +               const char *symname, long int *framesizep)
>>>> +{
>>>> +  print_enter (refcook, defcook, symname, regs->lr_reg[0], 
>>>> regs->lr_reg[1],
>>>> +           regs->lr_reg[2], *flags);
>>>> +
>>>> +  /* No need to copy anything, we will not need the parameters in 
>>>> any case.  */
>>>> +  *framesizep = 0;
>>>> +
>>>> +  return sym->st_value;
>>>> +}
>>>> +
>>>> +unsigned int
>>>> +la_loongarch_gnu_pltexit (ElfW (Sym) * sym, unsigned int ndx,
>>>> +              uintptr_t *refcook, uintptr_t *defcook,
>>>> +              const struct La_loongarch_regs *inregs,
>>>> +              struct La_loongarch_retval *outregs,
>>>> +              const char *symname)
>>>> +{
>>>> +  print_exit (refcook, defcook, symname, outregs->lrv_a0);
>>>> +
>>>> +  return 0;
>>>> +}
>>>> diff --git a/sysdeps/loongarch/start.S b/sysdeps/loongarch/start.S
>>>> new file mode 100644
>>>> index 0000000000..a9b32aa966
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/start.S
>>>> @@ -0,0 +1,67 @@
>>>> +/* Startup code compliant to the ELF LoongArch ABI.
>>>> +   Copyright (C) 2022 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/>. */
>>>> +
>>>> +#define __ASSEMBLY__ 1
>>>> +#include <entry.h>
>>>> +#include <sys/asm.h>
>>>> +
>>>> +/* The entry point's job is to call __libc_start_main.  Per the ABI,
>>>> +   a0 contains the address of a function to be passed to atexit.
>>>> +   __libc_start_main wants this in a5.  */
>>>> +
>>>> +/*
>>>> +int
>>>> +__libc_start_main (int (*main) (int, char **, char **),
>>>> +           int argc,
>>>> +           char **argv,
>>>> +           __typeof (main) init,
>>>> +           void (*fini) (void),
>>>> +           void (*rtld_fini) (void),
>>>> +           void *stack_end);
>>>> + */
>>>> +
>>>> +ENTRY (ENTRY_POINT)
>>>> +
>>>> +/* Terminate call stack by noting ra is undefined.  Use a dummy
>>>> +   .cfi_label to force starting the FDE.  */
>>>> +    .cfi_label .Ldummy
>>>> +    cfi_undefined (1)
>>>> +    or        a5, a0, zero /* rtld_fini */
>>>> +
>>>> +/* We must get symbol main through GOT table, since main may not 
>>>> be local.
>>>> +   For instance: googletest defines main in dynamic library. */
>>>> +    la.got        a0, t0, main
>>>> +    REG_L        a1, sp, 0
>>>> +    ADDI        a2, sp, SZREG
>>>> +
>>>> +    /* Adjust $sp for 16-aligned */
>>>> +    SRLI        sp, sp, 4
>>>> +    SLLI        sp, sp, 4
>>>> +
>>>> +    move        a3, zero /* used to be init */
>>>> +    move        a4, zero /* used to be fini */
>>>> +    or        a6, sp, zero /* stack_end */
>>>> +
>>>> +    la.got        ra, t0, __libc_start_main
>>>> +    jirl        ra, ra, 0
>>>> +
>>>> +    la.got        ra, t0, abort
>>>> +    jirl        ra, ra, 0
>>>> +END (ENTRY_POINT)
>>>> +
>>>> diff --git a/sysdeps/loongarch/sys/asm.h b/sysdeps/loongarch/sys/asm.h
>>>> new file mode 100644
>>>> index 0000000000..b41ee59694
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/sys/asm.h
>>>> @@ -0,0 +1,59 @@
>>>> +/* Miscellaneous macros.
>>>> +   Copyright (C) 2022 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 _SYS_ASM_H
>>>> +#define _SYS_ASM_H
>>>> +
>>>> +#include <sys/regdef.h>
>>>> +#include <sysdeps/generic/sysdep.h>
>>>> +
>>>> +/* Macros to handle different pointer/register sizes for 32/64-bit 
>>>> code.  */
>>>> +#define SZREG 8
>>>> +#define SZFREG 8
>>>> +#define REG_L ld.d
>>>> +#define REG_S st.d
>>>> +#define SRLI srli.d
>>>> +#define SLLI slli.d
>>>> +#define ADDI addi.d
>>>> +#define ADD  add.d
>>>> +#define BSTRINS  bstrins.d
>>>> +#define LI  li.d
>>>> +#define FREG_L fld.d
>>>> +#define FREG_S fst.d
>>>> +
>>>> +/* Declare leaf routine.  */
>>>> +#define LEAF(symbol) \
>>>> +  .text; \
>>>> +  .globl symbol; \
>>>> +  .align 3; \
>>>> +  cfi_startproc; \
>>>> +  .type symbol, @function; \
>>>> +  symbol:
>>>> +
>>>> +#define ENTRY(symbol) LEAF (symbol)
>>>> +
>>>> +/* Mark end of function.  */
>>>> +#undef END
>>>> +#define END(function) \
>>>> +  cfi_endproc; \
>>>> +  .size function, .- function;
>>>> +
>>>> +/* Stack alignment.  */
>>>> +#define ALMASK ~15
>>>> +
>>>> +#endif /* sys/asm.h */
>>>> diff --git a/sysdeps/loongarch/tst-audit.h 
>>>> b/sysdeps/loongarch/tst-audit.h
>>>> new file mode 100644
>>>> index 0000000000..e71948c86e
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/tst-audit.h
>>>> @@ -0,0 +1,23 @@
>>>> +/* Definitions for testing PLT entry/exit auditing.
>>>> +   Copyright (C) 2022 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/>. */
>>>> +
>>>> +#define pltenter la_loongarch_gnu_pltenter
>>>> +#define pltexit la_loongarch_gnu_pltexit
>>>> +#define La_regs La_loongarch_regs
>>>> +#define La_retval La_loongarch_retval
>>>> +#define int_retval lrv_a0
>>>> diff --git a/sysdeps/unix/sysv/linux/loongarch/ldconfig.h 
>>>> b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>>> new file mode 100644
>>>> index 0000000000..4887c30ca2
>>>> --- /dev/null
>>>> +++ b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>>> @@ -0,0 +1,26 @@
>>>> +/* ldconfig default paths and libraries.
>>>> +   Copyright (C) 2022 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 <sysdeps/generic/ldconfig.h>
>>>> +
>>>> +#define SYSDEP_KNOWN_INTERPRETER_NAMES \
>>>> +  { "/lib64/ld-linux-loongarch-lp64d.so.1", FLAG_ELF_LIBC6 },
>>>> +
>>>> +#define SYSDEP_KNOWN_LIBRARY_NAMES    \
>>>> +  { "libc.so.6", FLAG_ELF_LIBC6 },    \
>>>> +  { "libm.so.6", FLAG_ELF_LIBC6 },
>>>> -- 
>>>> 2.31.1
>>>>