diff mbox series

[1/1] LoongArch: Fix ptr mangling/demangling features.

Message ID 20220826080339.2859494-1-caiyinyu@loongson.cn
State New
Headers
Series [1/1] LoongArch: Fix ptr mangling/demangling features. |

Checks

Context Check Description
dj/TryBot-apply_patch success Patch applied to master at the time it was sent
dj/TryBot-32bit success Build for i686
redhat-pt-bot/TryBot-still_applies warning Patch no longer applies to master

Commit Message

caiyinyu Aug. 26, 2022, 8:03 a.m. UTC 
  Co-authored-by: Xi Ruoyao <xry111@xry111.site>
---
 config.h.in                                |  3 ++
 sysdeps/loongarch/__longjmp.S              |  2 +-
 sysdeps/loongarch/configure                | 26 ++++++++++++++
 sysdeps/loongarch/configure.ac             | 14 ++++++++
 sysdeps/loongarch/setjmp.S                 |  2 +-
 sysdeps/unix/sysv/linux/loongarch/sysdep.h | 40 +++++++++++++---------
 6 files changed, 68 insertions(+), 19 deletions(-)

Comments

Xi Ruoyao Aug. 29, 2022, 7:08 a.m. UTC | #1 
I'm OK with either this or the simplified version w/o ac check.

Not sure about Glibc policy about committing a change (does a port
maintainer needs approval to commit a change within this port?)

On Fri, 2022-08-26 at 16:03 +0800, caiyinyu wrote:
> Co-authored-by: Xi Ruoyao <xry111@xry111.site>
> ---
>  config.h.in                                |  3 ++
>  sysdeps/loongarch/__longjmp.S              |  2 +-
>  sysdeps/loongarch/configure                | 26 ++++++++++++++
>  sysdeps/loongarch/configure.ac             | 14 ++++++++
>  sysdeps/loongarch/setjmp.S                 |  2 +-
>  sysdeps/unix/sysv/linux/loongarch/sysdep.h | 40 +++++++++++++--------
> -
>  6 files changed, 68 insertions(+), 19 deletions(-)
> 
> diff --git a/config.h.in b/config.h.in
> index 43d32518ab..b182de0e91 100644
> --- a/config.h.in
> +++ b/config.h.in
> @@ -138,6 +138,9 @@
>  /* LOONGARCH floating-point ABI for ld.so.  */
>  #undef LOONGARCH_ABI_FRLEN
>  
> +/* To Indicate whether we can use explicit relocs or not.  */
> +#undef HAVE_LOONGARCH_EXPLICIT_RELOCS
> +
>  /* Linux specific: minimum supported kernel version.  */
>  #undef __LINUX_KERNEL_VERSION
>  
> diff --git a/sysdeps/loongarch/__longjmp.S
> b/sysdeps/loongarch/__longjmp.S
> index c2c5b56a80..4207376f5e 100644
> --- a/sysdeps/loongarch/__longjmp.S
> +++ b/sysdeps/loongarch/__longjmp.S
> @@ -22,7 +22,7 @@
>  ENTRY (__longjmp)
>  #ifdef PTR_MANGLE
>         REG_L t0, a0, 0*SZREG
> -       PTR_DEMANGLE (ra, t0, t1, t2)
> +       PTR_DEMANGLE (ra, t0, t1)
>         REG_L t0, a0, 1*SZREG
>         PTR_DEMANGLE2 (sp, t0, t1)
>  #else
> diff --git a/sysdeps/loongarch/configure b/sysdeps/loongarch/configure
> index 43b54d4965..54385786d2 100644
> --- a/sysdeps/loongarch/configure
> +++ b/sysdeps/loongarch/configure
> @@ -3,3 +3,29 @@
>  
>  $as_echo "#define HIDDEN_VAR_NEEDS_DYNAMIC_RELOC 1" >>confdefs.h
>  
> +
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether explicit
> relocs can be used" >&5
> +$as_echo_n "checking whether explicit relocs can be used... " >&6; }
> +if ${libc_cv_loongarch_explicit_relocs+:} false; then :
> +  $as_echo_n "(cached) " >&6
> +else
> +  cat > conftest.s << EOF
> +x: pcalau12i \$t0, %pc_hi20(x)
> +EOF
> +libc_cv_loongarch_explicit_relocs=no
> +if { ac_try='${CC-cc} -c $CFLAGS conftest.s -o conftest.o 1>&5'
> +  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; }
> >&5
> +  (eval $ac_try) 2>&5
> +  ac_status=$?
> +  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
> +  test $ac_status = 0; }; }; then
> +  libc_cv_loongarch_explicit_relocs=yes
> +fi
> +rm -f conftest*
> +fi
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: result:
> $libc_cv_loongarch_explicit_relocs" >&5
> +$as_echo "$libc_cv_loongarch_explicit_relocs" >&6; }
> +if test $libc_cv_loongarch_explicit_relocs = yes; then
> +  $as_echo "#define HAVE_LOONGARCH_EXPLICIT_RELOCS 1" >>confdefs.h
> +
> +fi
> diff --git a/sysdeps/loongarch/configure.ac
> b/sysdeps/loongarch/configure.ac
> index f744367bf3..c5d3cb5ead 100644
> --- a/sysdeps/loongarch/configure.ac
> +++ b/sysdeps/loongarch/configure.ac
> @@ -4,3 +4,17 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level
> source directory.
>  dnl It is always possible to access static and hidden symbols in an
>  dnl position independent way.
>  AC_DEFINE(HIDDEN_VAR_NEEDS_DYNAMIC_RELOC)
> +
> +AC_CACHE_CHECK(whether explicit relocs can be used,
> +               libc_cv_loongarch_explicit_relocs, [dnl
> +cat > conftest.s << EOF
> +x: pcalau12i \$t0, %pc_hi20(x)
> +EOF
> +libc_cv_loongarch_explicit_relocs=no
> +if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s -o conftest.o
> 1>&AS_MESSAGE_LOG_FD); then
> +  libc_cv_loongarch_explicit_relocs=yes
> +fi
> +rm -f conftest*])
> +if test $libc_cv_loongarch_explicit_relocs = yes; then
> +  AC_DEFINE(HAVE_LOONGARCH_EXPLICIT_RELOCS)
> +fi
> diff --git a/sysdeps/loongarch/setjmp.S b/sysdeps/loongarch/setjmp.S
> index ec4ddc72da..298bb02a82 100644
> --- a/sysdeps/loongarch/setjmp.S
> +++ b/sysdeps/loongarch/setjmp.S
> @@ -30,7 +30,7 @@ END (setjmp)
>  
>  ENTRY (__sigsetjmp)
>  #ifdef PTR_MANGLE
> -       PTR_MANGLE (t0, ra, t1, t2)
> +       PTR_MANGLE (t0, ra, t1)
>         REG_S t0, a0, 0*SZREG
>         PTR_MANGLE2 (t0, sp, t1)
>         REG_S t0, a0, 1*SZREG
> diff --git a/sysdeps/unix/sysv/linux/loongarch/sysdep.h
> b/sysdeps/unix/sysv/linux/loongarch/sysdep.h
> index 157cbd6c6b..0a8773c38d 100644
> --- a/sysdeps/unix/sysv/linux/loongarch/sysdep.h
> +++ b/sysdeps/unix/sysv/linux/loongarch/sysdep.h
> @@ -316,29 +316,35 @@ extern long int __syscall_error (long int
> neg_errno);
>  
>  /* Pointer mangling is supported for LoongArch.  */
>  
> -/* Load or store to/from a got-relative EXPR into/from G, using T.
> +/* Load a got-relative EXPR into G, using T.
>     Note G and T are register names.  */
> -#define LDST_GLOBAL(OP, G, T,  EXPR) \
> -  pcalau12i T, %got_pc_hi20(EXPR); \
> -  OP       T, T, %got_pc_lo12(EXPR); \
> -  OP       G, T, 0;
> +#define LD_GLOBAL(G, EXPR) \
> +  la.global G, EXPR; \
> +  REG_L            G,  G,  0;
>  
> -/* Load or store to/from a pc-relative EXPR into/from G, using T.
> +/* Load a pc-relative EXPR into G, using T.
>     Note G and T are register names.  */
> -#define LDST_PCREL(OP, G, T,  EXPR) \
> -  pcalau12i T, %pc_hi20(EXPR); \
> -  OP       G, T, %pc_lo12(EXPR);
> +
> +#ifdef HAVE_LOONGARCH_EXPLICIT_RELOCS
> +#define LD_PCREL(G, EXPR) \
> +  pcalau12i G, %pc_hi20(EXPR); \
> +  REG_L            G,  G,  %pc_lo12(EXPR);
> +#else
> +#define LD_PCREL(G, EXPR) \
> +  la.pcrel  G, EXPR; \
> +  REG_L            G,  G,  0;
> +#endif
>  
>  #if (IS_IN (rtld) \
>       || (!defined SHARED && (IS_IN (libc) \
>       || IS_IN (libpthread))))
>  
>  #ifdef __ASSEMBLER__
> -#define PTR_MANGLE(dst, src, guard, tmp) \
> -  LDST_PCREL (REG_L, guard, tmp, __pointer_chk_guard_local); \
> +#define PTR_MANGLE(dst, src, guard) \
> +  LD_PCREL (guard, __pointer_chk_guard_local); \
>    PTR_MANGLE2 (dst, src, guard);
> -#define PTR_DEMANGLE(dst, src, guard, tmp) \
> -  LDST_PCREL (REG_L, guard, tmp, __pointer_chk_guard_local); \
> +#define PTR_DEMANGLE(dst, src, guard) \
> +  LD_PCREL (guard, __pointer_chk_guard_local); \
>    PTR_DEMANGLE2 (dst, src, guard);
>  /* Use PTR_MANGLE2 for efficiency if guard is already loaded.  */
>  #define PTR_MANGLE2(dst, src, guard) \
> @@ -355,11 +361,11 @@ extern uintptr_t __pointer_chk_guard_local
> attribute_relro attribute_hidden;
>  #else
>  
>  #ifdef __ASSEMBLER__
> -#define PTR_MANGLE(dst, src, guard, tmp) \
> -  LDST_GLOBAL (REG_L, guard, tmp, __pointer_chk_guard); \
> +#define PTR_MANGLE(dst, src, guard) \
> +  LD_GLOBAL (guard, __pointer_chk_guard); \
>    PTR_MANGLE2 (dst, src, guard);
> -#define PTR_DEMANGLE(dst, src, guard, tmp) \
> -  LDST_GLOBAL (REG_L, guard, tmp, __pointer_chk_guard); \
> +#define PTR_DEMANGLE(dst, src, guard) \
> +  LD_GLOBAL (guard, __pointer_chk_guard); \
>    PTR_DEMANGLE2 (dst, src, guard);
>  /* Use PTR_MANGLE2 for efficiency if guard is already loaded.  */
>  #define PTR_MANGLE2(dst, src, guard) \
Adhemerval Zanella Aug. 29, 2022, 12:41 p.m. UTC | #2 
On 29/08/22 04:08, Xi Ruoyao wrote:
> I'm OK with either this or the simplified version w/o ac check.
> 
> Not sure about Glibc policy about committing a change (does a port
> maintainer needs approval to commit a change within this port?)

Afaik as long the arch-maintainer is ok with the change and there is
no blocker it should be ok to push.  I stil prefer to just use la.pcrel,
since it way simpler and I am really sceptical that using pcalau12i will
yield any real performance difference, but it is not a blocker from my
part.

> 
> On Fri, 2022-08-26 at 16:03 +0800, caiyinyu wrote:
>> Co-authored-by: Xi Ruoyao <xry111@xry111.site>
>> ---
>>  config.h.in                                |  3 ++
>>  sysdeps/loongarch/__longjmp.S              |  2 +-
>>  sysdeps/loongarch/configure                | 26 ++++++++++++++
>>  sysdeps/loongarch/configure.ac             | 14 ++++++++
>>  sysdeps/loongarch/setjmp.S                 |  2 +-
>>  sysdeps/unix/sysv/linux/loongarch/sysdep.h | 40 +++++++++++++--------
>> -
>>  6 files changed, 68 insertions(+), 19 deletions(-)
>>
>> diff --git a/config.h.in b/config.h.in
>> index 43d32518ab..b182de0e91 100644
>> --- a/config.h.in
>> +++ b/config.h.in
>> @@ -138,6 +138,9 @@
>>  /* LOONGARCH floating-point ABI for ld.so.  */
>>  #undef LOONGARCH_ABI_FRLEN
>>  
>> +/* To Indicate whether we can use explicit relocs or not.  */
>> +#undef HAVE_LOONGARCH_EXPLICIT_RELOCS
>> +
>>  /* Linux specific: minimum supported kernel version.  */
>>  #undef __LINUX_KERNEL_VERSION
>>  
>> diff --git a/sysdeps/loongarch/__longjmp.S
>> b/sysdeps/loongarch/__longjmp.S
>> index c2c5b56a80..4207376f5e 100644
>> --- a/sysdeps/loongarch/__longjmp.S
>> +++ b/sysdeps/loongarch/__longjmp.S
>> @@ -22,7 +22,7 @@
>>  ENTRY (__longjmp)
>>  #ifdef PTR_MANGLE
>>         REG_L t0, a0, 0*SZREG
>> -       PTR_DEMANGLE (ra, t0, t1, t2)
>> +       PTR_DEMANGLE (ra, t0, t1)
>>         REG_L t0, a0, 1*SZREG
>>         PTR_DEMANGLE2 (sp, t0, t1)
>>  #else
>> diff --git a/sysdeps/loongarch/configure b/sysdeps/loongarch/configure
>> index 43b54d4965..54385786d2 100644
>> --- a/sysdeps/loongarch/configure
>> +++ b/sysdeps/loongarch/configure
>> @@ -3,3 +3,29 @@
>>  
>>  $as_echo "#define HIDDEN_VAR_NEEDS_DYNAMIC_RELOC 1" >>confdefs.h
>>  
>> +
>> +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether explicit
>> relocs can be used" >&5
>> +$as_echo_n "checking whether explicit relocs can be used... " >&6; }
>> +if ${libc_cv_loongarch_explicit_relocs+:} false; then :
>> +  $as_echo_n "(cached) " >&6
>> +else
>> +  cat > conftest.s << EOF
>> +x: pcalau12i \$t0, %pc_hi20(x)
>> +EOF
>> +libc_cv_loongarch_explicit_relocs=no
>> +if { ac_try='${CC-cc} -c $CFLAGS conftest.s -o conftest.o 1>&5'
>> +  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; }
>>> &5
>> +  (eval $ac_try) 2>&5
>> +  ac_status=$?
>> +  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
>> +  test $ac_status = 0; }; }; then
>> +  libc_cv_loongarch_explicit_relocs=yes
>> +fi
>> +rm -f conftest*
>> +fi
>> +{ $as_echo "$as_me:${as_lineno-$LINENO}: result:
>> $libc_cv_loongarch_explicit_relocs" >&5
>> +$as_echo "$libc_cv_loongarch_explicit_relocs" >&6; }
>> +if test $libc_cv_loongarch_explicit_relocs = yes; then
>> +  $as_echo "#define HAVE_LOONGARCH_EXPLICIT_RELOCS 1" >>confdefs.h
>> +
>> +fi
>> diff --git a/sysdeps/loongarch/configure.ac
>> b/sysdeps/loongarch/configure.ac
>> index f744367bf3..c5d3cb5ead 100644
>> --- a/sysdeps/loongarch/configure.ac
>> +++ b/sysdeps/loongarch/configure.ac
>> @@ -4,3 +4,17 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level
>> source directory.
>>  dnl It is always possible to access static and hidden symbols in an
>>  dnl position independent way.
>>  AC_DEFINE(HIDDEN_VAR_NEEDS_DYNAMIC_RELOC)
>> +
>> +AC_CACHE_CHECK(whether explicit relocs can be used,
>> +               libc_cv_loongarch_explicit_relocs, [dnl
>> +cat > conftest.s << EOF
>> +x: pcalau12i \$t0, %pc_hi20(x)
>> +EOF
>> +libc_cv_loongarch_explicit_relocs=no
>> +if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s -o conftest.o
>> 1>&AS_MESSAGE_LOG_FD); then
>> +  libc_cv_loongarch_explicit_relocs=yes
>> +fi
>> +rm -f conftest*])
>> +if test $libc_cv_loongarch_explicit_relocs = yes; then
>> +  AC_DEFINE(HAVE_LOONGARCH_EXPLICIT_RELOCS)
>> +fi
>> diff --git a/sysdeps/loongarch/setjmp.S b/sysdeps/loongarch/setjmp.S
>> index ec4ddc72da..298bb02a82 100644
>> --- a/sysdeps/loongarch/setjmp.S
>> +++ b/sysdeps/loongarch/setjmp.S
>> @@ -30,7 +30,7 @@ END (setjmp)
>>  
>>  ENTRY (__sigsetjmp)
>>  #ifdef PTR_MANGLE
>> -       PTR_MANGLE (t0, ra, t1, t2)
>> +       PTR_MANGLE (t0, ra, t1)
>>         REG_S t0, a0, 0*SZREG
>>         PTR_MANGLE2 (t0, sp, t1)
>>         REG_S t0, a0, 1*SZREG
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/sysdep.h
>> b/sysdeps/unix/sysv/linux/loongarch/sysdep.h
>> index 157cbd6c6b..0a8773c38d 100644
>> --- a/sysdeps/unix/sysv/linux/loongarch/sysdep.h
>> +++ b/sysdeps/unix/sysv/linux/loongarch/sysdep.h
>> @@ -316,29 +316,35 @@ extern long int __syscall_error (long int
>> neg_errno);
>>  
>>  /* Pointer mangling is supported for LoongArch.  */
>>  
>> -/* Load or store to/from a got-relative EXPR into/from G, using T.
>> +/* Load a got-relative EXPR into G, using T.
>>     Note G and T are register names.  */
>> -#define LDST_GLOBAL(OP, G, T,  EXPR) \
>> -  pcalau12i T, %got_pc_hi20(EXPR); \
>> -  OP       T, T, %got_pc_lo12(EXPR); \
>> -  OP       G, T, 0;
>> +#define LD_GLOBAL(G, EXPR) \
>> +  la.global G, EXPR; \
>> +  REG_L            G,  G,  0;
>>  
>> -/* Load or store to/from a pc-relative EXPR into/from G, using T.
>> +/* Load a pc-relative EXPR into G, using T.
>>     Note G and T are register names.  */
>> -#define LDST_PCREL(OP, G, T,  EXPR) \
>> -  pcalau12i T, %pc_hi20(EXPR); \
>> -  OP       G, T, %pc_lo12(EXPR);
>> +
>> +#ifdef HAVE_LOONGARCH_EXPLICIT_RELOCS
>> +#define LD_PCREL(G, EXPR) \
>> +  pcalau12i G, %pc_hi20(EXPR); \
>> +  REG_L            G,  G,  %pc_lo12(EXPR);
>> +#else
>> +#define LD_PCREL(G, EXPR) \
>> +  la.pcrel  G, EXPR; \
>> +  REG_L            G,  G,  0;
>> +#endif
>>  
>>  #if (IS_IN (rtld) \
>>       || (!defined SHARED && (IS_IN (libc) \
>>       || IS_IN (libpthread))))
>>  
>>  #ifdef __ASSEMBLER__
>> -#define PTR_MANGLE(dst, src, guard, tmp) \
>> -  LDST_PCREL (REG_L, guard, tmp, __pointer_chk_guard_local); \
>> +#define PTR_MANGLE(dst, src, guard) \
>> +  LD_PCREL (guard, __pointer_chk_guard_local); \
>>    PTR_MANGLE2 (dst, src, guard);
>> -#define PTR_DEMANGLE(dst, src, guard, tmp) \
>> -  LDST_PCREL (REG_L, guard, tmp, __pointer_chk_guard_local); \
>> +#define PTR_DEMANGLE(dst, src, guard) \
>> +  LD_PCREL (guard, __pointer_chk_guard_local); \
>>    PTR_DEMANGLE2 (dst, src, guard);
>>  /* Use PTR_MANGLE2 for efficiency if guard is already loaded.  */
>>  #define PTR_MANGLE2(dst, src, guard) \
>> @@ -355,11 +361,11 @@ extern uintptr_t __pointer_chk_guard_local
>> attribute_relro attribute_hidden;
>>  #else
>>  
>>  #ifdef __ASSEMBLER__
>> -#define PTR_MANGLE(dst, src, guard, tmp) \
>> -  LDST_GLOBAL (REG_L, guard, tmp, __pointer_chk_guard); \
>> +#define PTR_MANGLE(dst, src, guard) \
>> +  LD_GLOBAL (guard, __pointer_chk_guard); \
>>    PTR_MANGLE2 (dst, src, guard);
>> -#define PTR_DEMANGLE(dst, src, guard, tmp) \
>> -  LDST_GLOBAL (REG_L, guard, tmp, __pointer_chk_guard); \
>> +#define PTR_DEMANGLE(dst, src, guard) \
>> +  LD_GLOBAL (guard, __pointer_chk_guard); \
>>    PTR_DEMANGLE2 (dst, src, guard);
>>  /* Use PTR_MANGLE2 for efficiency if guard is already loaded.  */
>>  #define PTR_MANGLE2(dst, src, guard) \
>
diff mbox series

Patch

diff --git a/config.h.in b/config.h.in
index 43d32518ab..b182de0e91 100644
--- a/config.h.in
+++ b/config.h.in
@@ -138,6 +138,9 @@ 
 /* LOONGARCH floating-point ABI for ld.so.  */
 #undef LOONGARCH_ABI_FRLEN
 
+/* To Indicate whether we can use explicit relocs or not.  */
+#undef HAVE_LOONGARCH_EXPLICIT_RELOCS
+
 /* Linux specific: minimum supported kernel version.  */
 #undef	__LINUX_KERNEL_VERSION
 
diff --git a/sysdeps/loongarch/__longjmp.S b/sysdeps/loongarch/__longjmp.S
index c2c5b56a80..4207376f5e 100644
--- a/sysdeps/loongarch/__longjmp.S
+++ b/sysdeps/loongarch/__longjmp.S
@@ -22,7 +22,7 @@ 
 ENTRY (__longjmp)
 #ifdef PTR_MANGLE
 	REG_L t0, a0, 0*SZREG
-	PTR_DEMANGLE (ra, t0, t1, t2)
+	PTR_DEMANGLE (ra, t0, t1)
 	REG_L t0, a0, 1*SZREG
 	PTR_DEMANGLE2 (sp, t0, t1)
 #else
diff --git a/sysdeps/loongarch/configure b/sysdeps/loongarch/configure
index 43b54d4965..54385786d2 100644
--- a/sysdeps/loongarch/configure
+++ b/sysdeps/loongarch/configure
@@ -3,3 +3,29 @@ 
 
 $as_echo "#define HIDDEN_VAR_NEEDS_DYNAMIC_RELOC 1" >>confdefs.h
 
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether explicit relocs can be used" >&5
+$as_echo_n "checking whether explicit relocs can be used... " >&6; }
+if ${libc_cv_loongarch_explicit_relocs+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat > conftest.s << EOF
+x: pcalau12i \$t0, %pc_hi20(x)
+EOF
+libc_cv_loongarch_explicit_relocs=no
+if { ac_try='${CC-cc} -c $CFLAGS conftest.s -o conftest.o 1>&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then
+  libc_cv_loongarch_explicit_relocs=yes
+fi
+rm -f conftest*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_loongarch_explicit_relocs" >&5
+$as_echo "$libc_cv_loongarch_explicit_relocs" >&6; }
+if test $libc_cv_loongarch_explicit_relocs = yes; then
+  $as_echo "#define HAVE_LOONGARCH_EXPLICIT_RELOCS 1" >>confdefs.h
+
+fi
diff --git a/sysdeps/loongarch/configure.ac b/sysdeps/loongarch/configure.ac
index f744367bf3..c5d3cb5ead 100644
--- a/sysdeps/loongarch/configure.ac
+++ b/sysdeps/loongarch/configure.ac
@@ -4,3 +4,17 @@  GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
 dnl It is always possible to access static and hidden symbols in an
 dnl position independent way.
 AC_DEFINE(HIDDEN_VAR_NEEDS_DYNAMIC_RELOC)
+
+AC_CACHE_CHECK(whether explicit relocs can be used,
+               libc_cv_loongarch_explicit_relocs, [dnl
+cat > conftest.s << EOF
+x: pcalau12i \$t0, %pc_hi20(x)
+EOF
+libc_cv_loongarch_explicit_relocs=no
+if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s -o conftest.o 1>&AS_MESSAGE_LOG_FD); then
+  libc_cv_loongarch_explicit_relocs=yes
+fi
+rm -f conftest*])
+if test $libc_cv_loongarch_explicit_relocs = yes; then
+  AC_DEFINE(HAVE_LOONGARCH_EXPLICIT_RELOCS)
+fi
diff --git a/sysdeps/loongarch/setjmp.S b/sysdeps/loongarch/setjmp.S
index ec4ddc72da..298bb02a82 100644
--- a/sysdeps/loongarch/setjmp.S
+++ b/sysdeps/loongarch/setjmp.S
@@ -30,7 +30,7 @@  END (setjmp)
 
 ENTRY (__sigsetjmp)
 #ifdef PTR_MANGLE
-	PTR_MANGLE (t0, ra, t1, t2)
+	PTR_MANGLE (t0, ra, t1)
 	REG_S t0, a0, 0*SZREG
 	PTR_MANGLE2 (t0, sp, t1)
 	REG_S t0, a0, 1*SZREG
diff --git a/sysdeps/unix/sysv/linux/loongarch/sysdep.h b/sysdeps/unix/sysv/linux/loongarch/sysdep.h
index 157cbd6c6b..0a8773c38d 100644
--- a/sysdeps/unix/sysv/linux/loongarch/sysdep.h
+++ b/sysdeps/unix/sysv/linux/loongarch/sysdep.h
@@ -316,29 +316,35 @@  extern long int __syscall_error (long int neg_errno);
 
 /* Pointer mangling is supported for LoongArch.  */
 
-/* Load or store to/from a got-relative EXPR into/from G, using T.
+/* Load a got-relative EXPR into G, using T.
    Note G and T are register names.  */
-#define LDST_GLOBAL(OP, G, T,  EXPR) \
-  pcalau12i T, %got_pc_hi20(EXPR); \
-  OP	    T, T, %got_pc_lo12(EXPR); \
-  OP	    G, T, 0;
+#define LD_GLOBAL(G, EXPR) \
+  la.global G,	EXPR; \
+  REG_L	    G,	G,  0;
 
-/* Load or store to/from a pc-relative EXPR into/from G, using T.
+/* Load a pc-relative EXPR into G, using T.
    Note G and T are register names.  */
-#define LDST_PCREL(OP, G, T,  EXPR) \
-  pcalau12i T, %pc_hi20(EXPR); \
-  OP	    G, T, %pc_lo12(EXPR);
+
+#ifdef HAVE_LOONGARCH_EXPLICIT_RELOCS
+#define LD_PCREL(G, EXPR) \
+  pcalau12i G,	%pc_hi20(EXPR); \
+  REG_L	    G,	G,  %pc_lo12(EXPR);
+#else
+#define LD_PCREL(G, EXPR) \
+  la.pcrel  G,	EXPR; \
+  REG_L	    G,	G,  0;
+#endif
 
 #if (IS_IN (rtld) \
      || (!defined SHARED && (IS_IN (libc) \
      || IS_IN (libpthread))))
 
 #ifdef __ASSEMBLER__
-#define PTR_MANGLE(dst, src, guard, tmp) \
-  LDST_PCREL (REG_L, guard, tmp, __pointer_chk_guard_local); \
+#define PTR_MANGLE(dst, src, guard) \
+  LD_PCREL (guard, __pointer_chk_guard_local); \
   PTR_MANGLE2 (dst, src, guard);
-#define PTR_DEMANGLE(dst, src, guard, tmp) \
-  LDST_PCREL (REG_L, guard, tmp, __pointer_chk_guard_local); \
+#define PTR_DEMANGLE(dst, src, guard) \
+  LD_PCREL (guard, __pointer_chk_guard_local); \
   PTR_DEMANGLE2 (dst, src, guard);
 /* Use PTR_MANGLE2 for efficiency if guard is already loaded.  */
 #define PTR_MANGLE2(dst, src, guard) \
@@ -355,11 +361,11 @@  extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden;
 #else
 
 #ifdef __ASSEMBLER__
-#define PTR_MANGLE(dst, src, guard, tmp) \
-  LDST_GLOBAL (REG_L, guard, tmp, __pointer_chk_guard); \
+#define PTR_MANGLE(dst, src, guard) \
+  LD_GLOBAL (guard, __pointer_chk_guard); \
   PTR_MANGLE2 (dst, src, guard);
-#define PTR_DEMANGLE(dst, src, guard, tmp) \
-  LDST_GLOBAL (REG_L, guard, tmp, __pointer_chk_guard); \
+#define PTR_DEMANGLE(dst, src, guard) \
+  LD_GLOBAL (guard, __pointer_chk_guard); \
   PTR_DEMANGLE2 (dst, src, guard);
 /* Use PTR_MANGLE2 for efficiency if guard is already loaded.  */
 #define PTR_MANGLE2(dst, src, guard) \