linux: Consolidate xstat{64}

The LFS support is implemented on xstat64.c, instead of xstat.c for
64-bit architectures.  The xstat.c implements the non-LFS it is
no-op for !XSTAT_IS_XSTAT64.

The generic non-LFS implementation handle two cases:

  1. New kABIs which uses generic pre 64-bit time Linux ABI (csky and
     nios): it issues __NR_fstat64 plus handle the overflow on st_ino,
     st_size, or st_blocks.  It only handles _STAT_VER_KERNEL.

  2. Old KABIs with old non-LFS support (arm, i386, hppa, m68k,
     microblaze, s390, sh, powerpc, and sparc32).  For _STAT_VER_KERNEL
     it issues __NR_stat, otherwise it issues __NR_stat64 and convert
     to non-LFS stat struct handling possible overflows on st_ino,
     st_size, or st_blocks.

Also the non-LFS mips is an outlier and it has its own implementation
since _STAT_VER_LINUX requires a different conversion function (it uses
the kernel_stat as the syscall argument since its exported ABI is
different than the kernel one for both non-LFS and LFS implementation).

The generic LFS implementation handles multiple cases:

  1. XSTAT_IS_XSTAT64 being 1:

    1.1. Old 64-bit kABI (ia64, powerpc64*, s390x, x86_64): it
         issues __NR_stat for _STAT_VER_KERNEL or _STAT_VER_LINUX.

    1.2. Old 64-bit kABI with defines __NR_stat64 instead of __NR_stat
	 (sparc64): it issues __NR_stat for _STAT_VER_KERNEL or
	 __NR_stat64 and convert to struct stat64.

    1.3. New kABIs which uses generic 64-bit Linux ABI (aarch64 and
         riscv64): it issues __NR_newfstatat and only for
         _STAT_VER_KERNEL.

    1.4. New 32-bit kABIs with only 64-bit time_t support (arc and
	 riscv32): it issues __NR_statx and covert to struct stat64.

  2. Old ABIs with XSTAT_IS_XSTAT64 being 0:

    2.1. New kABIs which uses generic pre 64-bit time Linux ABI (csky
	 and nios2): it issues __NR_fstatat64 for _STAT_VER_KERNEL.

    2.2. Old kABIs with old non-LFS support (arm, i386, hppa, m68k,
	 microblaze, s390, sh, mips32, powerpc32, and sparc32): it
	 issues __NR_stat64.

Also, two special cases requires specific LFS implementations:

  1. alpha: it requires to handle _STAT_VER_KERNEL64 to call __NR_stat64
     or use the kernel_stat with __NR_stat otherwise.

  2. mips64: as for non-LFS implementation its ABIs differ from glibc
     exported one, which requires an specific conversion function to
     handle the kernel_stat.

Checked with a build for all affected ABIs. I also checked on x86_64,
i686, powerpc, powerpc64le, sparcv9, sparc64, s390, and s390x.

Reviewed-by: Lukasz Majewski <lukma@denx.de>

20 files changed, 194 insertions, 332 deletions

diff --git a/sysdeps/unix/sysv/linux/alpha/xstat.c b/sysdeps/unix/sysv/linux/alpha/xstat.c
deleted file mode 100644
index 3ba1ae1811..0000000000
--- a/sysdeps/unix/sysv/linux/alpha/xstat.c
+++ /dev/null
@@ -1,57 +0,0 @@
-/* xstat using old-style Unix stat system call.
-   Copyright (C) 2004-2020 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 __xstat64 __xstat64_disable
-
-#include <errno.h>
-#include <stddef.h>
-#include <sys/stat.h>
-#include <kernel_stat.h>
-#include <sysdep.h>
-#include <sys/syscall.h>
-#include <xstatconv.h>
-
-#undef __xstat64
-
-
-/* Get information about the file NAME in BUF.  */
-int
-__xstat (int vers, const char *name, struct stat *buf)
-{
-  int result;
-  struct kernel_stat kbuf;
-
-  if (vers == _STAT_VER_KERNEL64)
-    {
-      result = INTERNAL_SYSCALL_CALL (stat64, name, buf);
-      if (__glibc_likely (!INTERNAL_SYSCALL_ERROR_P (result)))
-	return result;
-      __set_errno (INTERNAL_SYSCALL_ERRNO (result));
-      return -1;
-    }
-
-  result = INTERNAL_SYSCALL_CALL (stat, name, &kbuf);
-  if (__glibc_likely (!INTERNAL_SYSCALL_ERROR_P (result)))
-    return __xstat_conv (vers, &kbuf, buf);
-  __set_errno (INTERNAL_SYSCALL_ERRNO (result));
-  return -1;
-}
-hidden_def (__xstat)
-weak_alias (__xstat, _xstat);
-strong_alias (__xstat, __xstat64);
-hidden_ver (__xstat, __xstat64)
diff --git a/sysdeps/unix/sysv/linux/generic/xstat.c b/sysdeps/unix/sysv/linux/alpha/xstat64.c
index 2eb27a6f91..ac1af53780 100644
--- a/sysdeps/unix/sysv/linux/generic/xstat.c
+++ b/sysdeps/unix/sysv/linux/alpha/xstat64.c
@@ -1,6 +1,6 @@
-/* Copyright (C) 2011-2020 Free Software Foundation, Inc.
+/* xstat using old-style Unix stat system call.
+   Copyright (C) 2004-2020 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -16,33 +16,34 @@
    License along with the GNU C Library.  If not, see
    <https://www.gnu.org/licenses/>.  */
 
-/* Ignore prototype to avoid error if we alias __xstat and __xstat64. */
-#define __xstat64 __xstat64_disable
-
-#include <errno.h>
-#include <stddef.h>
-#include <fcntl.h>
+#define __xstat __redirect___xstat
 #include <sys/stat.h>
+#undef __xstat
+#include <fcntl.h>
 #include <kernel_stat.h>
-
 #include <sysdep.h>
-#include <sys/syscall.h>
+#include <xstatconv.h>
 
 /* Get information about the file NAME in BUF.  */
 int
-__xstat (int vers, const char *name, struct stat *buf)
+__xstat64 (int vers, const char *name, struct stat64 *buf)
 {
-  if (vers == _STAT_VER_KERNEL)
-    return INLINE_SYSCALL (newfstatat, 4, AT_FDCWD, name, buf, 0);
-
-  errno = EINVAL;
-  return -1;
+  switch (vers)
+    {
+    case _STAT_VER_KERNEL64:
+      return INLINE_SYSCALL_CALL (stat64, name, buf);
+
+    default:
+      {
+        struct kernel_stat kbuf;
+	int r = INTERNAL_SYSCALL_CALL (stat, name, &kbuf);
+	if (r == 0)
+	  return __xstat_conv (vers, &kbuf, buf);
+	return INLINE_SYSCALL_ERROR_RETURN_VALUE (-r);
+      }
+    }
 }
+weak_alias (__xstat64, __xstat);
+weak_alias (__xstat64, __GI___xstat);
 
-hidden_def (__xstat)
-weak_alias (__xstat, _xstat);
-#if XSTAT_IS_XSTAT64
-#undef __xstat64
-strong_alias (__xstat, __xstat64);
-hidden_ver (__xstat, __xstat64)
-#endif
+hidden_def (__xstat64)
diff --git a/sysdeps/unix/sysv/linux/arm/xstat.c b/sysdeps/unix/sysv/linux/arm/xstat.c
deleted file mode 100644
index e9869f5508..0000000000
--- a/sysdeps/unix/sysv/linux/arm/xstat.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/xstat.c>
diff --git a/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat.c b/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat.c
deleted file mode 100644
index a4a921c1ea..0000000000
--- a/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat.c
+++ /dev/null
@@ -1,54 +0,0 @@
-/* Copyright (C) 2011-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
-
-   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 <errno.h>
-#include <stddef.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <kernel_stat.h>
-
-#include <sysdep.h>
-#include <sys/syscall.h>
-
-#if !XSTAT_IS_XSTAT64
-#include "overflow.h"
-#include <statx_cp.h>
-
-/* Get information about the file NAME in BUF.  */
-int
-__xstat (int vers, const char *name, struct stat *buf)
-{
-  if (vers == _STAT_VER_KERNEL)
-    {
-# ifdef __NR_fstatat64
-      int rc = INLINE_SYSCALL (fstatat64, 4, AT_FDCWD, name, buf, 0);
-# else
-      struct statx tmp;
-      int rc = INLINE_SYSCALL (statx, 5, AT_FDCWD, name, AT_NO_AUTOMOUNT,
-                               STATX_BASIC_STATS, &tmp);
-      if (rc == 0)
-        __cp_stat64_statx ((struct stat64 *)buf, &tmp);
-# endif
-      return rc ?: stat_overflow (buf);
-    }
-
-  errno = EINVAL;
-  return -1;
-}
-hidden_def (__xstat)
-#endif
diff --git a/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat64.c b/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat64.c
deleted file mode 100644
index 0848b5a4b4..0000000000
--- a/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat64.c
+++ /dev/null
@@ -1,63 +0,0 @@
-/* Copyright (C) 2011-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
-
-   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/>.  */
-
-/* Hide the prototype for __xstat so that GCC will not complain about
-   the different function signature if it is aliased to  __xstat64.
-   If XSTAT_IS_XSTAT64 is set to non-zero then the stat and stat64
-   structures have an identical layout but different type names.  */
-
-#define __xstat __xstat_disable
-
-#include <errno.h>
-#include <stddef.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <kernel_stat.h>
-
-#include <sysdep.h>
-#include <sys/syscall.h>
-
-#include <statx_cp.h>
-
-/* Get information about the file NAME in BUF.  */
-int
-__xstat64 (int vers, const char *name, struct stat64 *buf)
-{
-  if (vers == _STAT_VER_KERNEL)
-    {
-#ifdef __NR_fstatat64
-      return INLINE_SYSCALL (fstatat64, 4, AT_FDCWD, name, buf, 0);
-#else
-      struct statx tmp;
-      int rc = INLINE_SYSCALL (statx, 5, AT_FDCWD, name, AT_NO_AUTOMOUNT,
-                               STATX_BASIC_STATS, &tmp);
-      if (rc == 0)
-        __cp_stat64_statx (buf, &tmp);
-      return rc;
-#endif
-    }
-  errno = EINVAL;
-  return -1;
-}
-hidden_def (__xstat64)
-
-#undef __xstat
-#if XSTAT_IS_XSTAT64
-strong_alias (__xstat64, __xstat)
-hidden_ver (__xstat64, __xstat)
-#endif
diff --git a/sysdeps/unix/sysv/linux/hppa/xstat.c b/sysdeps/unix/sysv/linux/hppa/xstat.c
deleted file mode 100644
index e9869f5508..0000000000
--- a/sysdeps/unix/sysv/linux/hppa/xstat.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/xstat.c>
diff --git a/sysdeps/unix/sysv/linux/i386/xstat.c b/sysdeps/unix/sysv/linux/i386/xstat.c
deleted file mode 100644
index 96f67168ac..0000000000
--- a/sysdeps/unix/sysv/linux/i386/xstat.c
+++ /dev/null
@@ -1,59 +0,0 @@
-/* xstat using old-style Unix stat system call.
-   Copyright (C) 1991-2020 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/>.  */
-
-/* Ho hum, if xstat == xstat64 we must get rid of the prototype or gcc
-   will complain since they don't strictly match.  */
-#define __xstat64 __xstat64_disable
-
-#include <errno.h>
-#include <stddef.h>
-#include <sys/stat.h>
-#include <kernel_stat.h>
-
-#include <sysdep.h>
-#include <sys/syscall.h>
-
-#include <xstatconv.h>
-
-
-/* Get information about the file NAME in BUF.  */
-int
-__xstat (int vers, const char *name, struct stat *buf)
-{
-  int result;
-
-  if (vers == _STAT_VER_KERNEL)
-    return INLINE_SYSCALL (stat, 2, name, buf);
-
-  {
-    struct stat64 buf64;
-
-    result = INTERNAL_SYSCALL_CALL (stat64, name, &buf64);
-    if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (result)))
-      return INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (result));
-    else
-      return __xstat32_conv (vers, &buf64, buf);
-  }
-}
-hidden_def (__xstat)
-weak_alias (__xstat, _xstat);
-#if XSTAT_IS_XSTAT64
-# undef __xstat64
-strong_alias (__xstat, __xstat64);
-hidden_ver (__xstat, __xstat64)
-#endif
diff --git a/sysdeps/unix/sysv/linux/m68k/xstat.c b/sysdeps/unix/sysv/linux/m68k/xstat.c
deleted file mode 100644
index e9869f5508..0000000000
--- a/sysdeps/unix/sysv/linux/m68k/xstat.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/xstat.c>
diff --git a/sysdeps/unix/sysv/linux/microblaze/xstat.c b/sysdeps/unix/sysv/linux/microblaze/xstat.c
deleted file mode 100644
index e9869f5508..0000000000
--- a/sysdeps/unix/sysv/linux/microblaze/xstat.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/xstat.c>
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/xstat64.c b/sysdeps/unix/sysv/linux/mips/mips64/xstat64.c
index 7eee9e67d4..99b03c7593 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/xstat64.c
+++ b/sysdeps/unix/sysv/linux/mips/mips64/xstat64.c
@@ -1,4 +1,4 @@
-/* xstat64 using 64-bit MIPS stat system call.
+/* xstat64 using Linux stat64 system call.
    Copyright (C) 1991-2020 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -16,14 +16,9 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-#include <errno.h>
-#include <stddef.h>
 #include <sys/stat.h>
 #include <kernel_stat.h>
-
 #include <sysdep.h>
-#include <sys/syscall.h>
-
 #include <xstatconv.h>
 
 /* Get information about the file NAME in BUF.  */
@@ -31,14 +26,9 @@
 int
 __xstat64 (int vers, const char *name, struct stat64 *buf)
 {
-  int result;
   struct kernel_stat kbuf;
-
-  result = INLINE_SYSCALL (stat, 2, name, &kbuf);
-  if (result == 0)
-    result = __xstat64_conv (vers, &kbuf, buf);
-
-  return result;
+  int r = INLINE_SYSCALL_CALL (stat, name, &kbuf);
+  return r ?: __xstat64_conv (vers, &kbuf, buf);
 }
 
 hidden_def (__xstat64)
diff --git a/sysdeps/unix/sysv/linux/wordsize-64/xstat.c b/sysdeps/unix/sysv/linux/mips/xstat.c
index 438d54d291..835691cf89 100644
--- a/sysdeps/unix/sysv/linux/wordsize-64/xstat.c
+++ b/sysdeps/unix/sysv/linux/mips/xstat.c
@@ -16,29 +16,27 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-/* Ho hum, since xstat == xstat64 we must get rid of the prototype or gcc
-   will complain since they don't strictly match.  */
-#define __xstat64 __xstat64_disable
-
-#include <errno.h>
-#include <stddef.h>
 #include <sys/stat.h>
-
+#include <fcntl.h>
+#include <kernel_stat.h>
 #include <sysdep.h>
-#include <sys/syscall.h>
+#include <xstatconv.h>
 
 /* Get information about the file NAME in BUF.  */
 int
 __xstat (int vers, const char *name, struct stat *buf)
 {
-  if (vers == _STAT_VER_KERNEL || vers == _STAT_VER_LINUX)
-    return INLINE_SYSCALL (stat, 2, name, buf);
-
-  __set_errno (EINVAL);
-  return -1;
+  switch (vers)
+    {
+    case _STAT_VER_KERNEL:
+      return INLINE_SYSCALL_CALL (stat, name, buf);
+
+    default:
+      {
+	struct kernel_stat kbuf;
+	int r = INTERNAL_SYSCALL_CALL (stat, name, &kbuf);
+	return r ?: __xstat_conv (vers, &kbuf, buf);
+      }
+    }
 }
 hidden_def (__xstat)
-weak_alias (__xstat, _xstat);
-#undef __xstat64
-strong_alias (__xstat, __xstat64);
-hidden_ver (__xstat, __xstat64)
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/xstat.c b/sysdeps/unix/sysv/linux/powerpc/powerpc32/xstat.c
deleted file mode 100644
index e9869f5508..0000000000
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/xstat.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/xstat.c>
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/xstat.c b/sysdeps/unix/sysv/linux/s390/s390-32/xstat.c
deleted file mode 100644
index e9869f5508..0000000000
--- a/sysdeps/unix/sysv/linux/s390/s390-32/xstat.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/xstat.c>
diff --git a/sysdeps/unix/sysv/linux/sh/xstat.c b/sysdeps/unix/sysv/linux/sh/xstat.c
deleted file mode 100644
index e9869f5508..0000000000
--- a/sysdeps/unix/sysv/linux/sh/xstat.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/xstat.c>
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/xstat.c b/sysdeps/unix/sysv/linux/sparc/sparc32/xstat.c
deleted file mode 100644
index e9869f5508..0000000000
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/xstat.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/unix/sysv/linux/i386/xstat.c>
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/xstat.c b/sysdeps/unix/sysv/linux/sparc/sparc64/xstat.c
deleted file mode 100644
index c3b00cb1d4..0000000000
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/xstat.c
+++ /dev/null
@@ -1 +0,0 @@
-#include "../../i386/xstat.c"
diff --git a/sysdeps/unix/sysv/linux/wordsize-64/xstat64.c b/sysdeps/unix/sysv/linux/wordsize-64/xstat64.c
deleted file mode 100644
index e7acd3b45e..0000000000
--- a/sysdeps/unix/sysv/linux/wordsize-64/xstat64.c
+++ /dev/null
@@ -1 +0,0 @@
-/* xstat64 is in xstat.c */
diff --git a/sysdeps/unix/sysv/linux/xstat.c b/sysdeps/unix/sysv/linux/xstat.c
index 76c90e20c7..0ae52b1901 100644
--- a/sysdeps/unix/sysv/linux/xstat.c
+++ b/sysdeps/unix/sysv/linux/xstat.c
@@ -16,44 +16,46 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-/* Ho hum, if xstat == xstat64 we must get rid of the prototype or gcc
-   will complain since they don't strictly match.  */
-#define __xstat64 __xstat64_disable
-
-#include <errno.h>
-#include <stddef.h>
 #include <sys/stat.h>
+#include <fcntl.h>
 #include <kernel_stat.h>
-
 #include <sysdep.h>
-#include <sys/syscall.h>
 
-#include <xstatconv.h>
+#if !XSTAT_IS_XSTAT64
+# include <xstatconv.h>
+# include <xstatover.h>
 
 /* Get information about the file NAME in BUF.  */
 int
 __xstat (int vers, const char *name, struct stat *buf)
 {
-  if (vers == _STAT_VER_KERNEL)
-    return INLINE_SYSCALL (stat, 2, name, buf);
-
-#if STAT_IS_KERNEL_STAT
-  return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
-#else
-  struct kernel_stat kbuf;
-  int result;
-
-  result = INLINE_SYSCALL (stat, 2, name, &kbuf);
-  if (result == 0)
-    result = __xstat_conv (vers, &kbuf, buf);
-
-  return result;
+  switch (vers)
+    {
+    case _STAT_VER_KERNEL:
+      {
+# if STAT_IS_KERNEL_STAT
+	/* New kABIs which uses generic pre 64-bit time Linux ABI,
+	   e.g. csky, nios2  */
+	int r = INLINE_SYSCALL_CALL (fstatat64, AT_FDCWD, name, buf, 0);
+	return r ?: stat_overflow (buf);
+# else
+	/* Old kABIs with old non-LFS support, e.g. arm, i386, hppa, m68k,
+	   microblaze, s390, sh, powerpc, and sparc32.  */
+	return INLINE_SYSCALL_CALL (stat, name, buf);
+# endif
+      }
+
+    default:
+      {
+# if STAT_IS_KERNEL_STAT
+	return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
+# else
+	struct stat64 buf64;
+	int r = INLINE_SYSCALL_CALL (stat64, name, &buf64);
+	return r ?: __xstat32_conv (vers, &buf64, buf);
 #endif
+      }
+    }
 }
 hidden_def (__xstat)
-weak_alias (__xstat, _xstat);
-#if XSTAT_IS_XSTAT64
-#undef __xstat64
-strong_alias (__xstat, __xstat64);
-hidden_ver (__xstat, __xstat64)
-#endif
+#endif /* XSTAT_IS_XSTAT64  */
diff --git a/sysdeps/unix/sysv/linux/xstat64.c b/sysdeps/unix/sysv/linux/xstat64.c
index 16c6e69710..919d98cb4e 100644
--- a/sysdeps/unix/sysv/linux/xstat64.c
+++ b/sysdeps/unix/sysv/linux/xstat64.c
@@ -16,24 +16,71 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-#include <errno.h>
-#include <stddef.h>
+#define __xstat __redirect___xstat
 #include <sys/stat.h>
+#undef __xstat
+#include <fcntl.h>
 #include <kernel_stat.h>
-
 #include <sysdep.h>
-#include <sys/syscall.h>
+#include <xstatconv.h>
+#include <statx_cp.h>
 
 /* Get information about the file NAME in BUF.  */
 
 int
 ___xstat64 (int vers, const char *name, struct stat64 *buf)
 {
-  int result;
-  result = INLINE_SYSCALL (stat64, 2, name, buf);
-  return result;
+#if XSTAT_IS_XSTAT64
+# ifdef __NR_stat64
+  /* 64-bit kABI outlier, e.g. sparc64.  */
+  if (vers == _STAT_VER_KERNEL)
+    return INLINE_SYSCALL_CALL (stat, name, buf);
+  else
+    {
+      struct stat64 st64;
+      int r = INLINE_SYSCALL_CALL (stat64, name, &st64);
+      return r ?: __xstat32_conv (vers, &st64, (struct stat *) buf);
+    }
+# elif defined __NR_stat
+  /* Old 64-bit kABI, e.g. ia64, powerpc64*, s390x, and x86_64.  */
+  if (vers == _STAT_VER_KERNEL || vers == _STAT_VER_LINUX)
+    return INLINE_SYSCALL_CALL (stat, name, buf);
+# elif defined __NR_newfstatat
+  /* New kABIs which uses generic 64-bit Linux ABI, e.g. aarch64, riscv64.  */
+  if (vers == _STAT_VER_KERNEL)
+    return INLINE_SYSCALL_CALL (newfstatat, AT_FDCWD, name, buf, 0);
+# else
+  /* New 32-bit kABIs with only 64-bit time_t support, e.g. arc, riscv32.  */
+  if (vers == _STAT_VER_KERNEL)
+    {
+      struct statx tmp;
+      int r = INLINE_SYSCALL_CALL (statx, AT_FDCWD, name, AT_NO_AUTOMOUNT,
+				   STATX_BASIC_STATS, &tmp);
+      if (r == 0)
+	__cp_stat64_statx (buf, &tmp);
+      return r;
+     }
+# endif
+#else
+# if STAT_IS_KERNEL_STAT
+  /* New kABIs which uses generic pre 64-bit time Linux ABI,
+     e.g. csky, nios2  */
+  if (vers == _STAT_VER_KERNEL)
+    return INLINE_SYSCALL_CALL (fstatat64, AT_FDCWD, name, buf, 0);
+# else
+  /* Old kABIs with old non-LFS support, e.g. arm, i386, hppa, m68k,
+     microblaze, s390, sh, mips32, powerpc32, and sparc32.  */
+  return INLINE_SYSCALL_CALL (stat64, name, buf);
+# endif /* STAT_IS_KERNEL_STAT  */
+#endif /* XSTAT_IS_XSTAT64  */
+
+  return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
 }
 
+#if XSTAT_IS_XSTAT64
+weak_alias (___xstat64, __xstat);
+weak_alias (___xstat64, __GI___xstat);
+#endif
 
 #include <shlib-compat.h>
 
diff --git a/sysdeps/unix/sysv/linux/xstatover.h b/sysdeps/unix/sysv/linux/xstatover.h
new file mode 100644
index 0000000000..20178114f9
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/xstatover.h
@@ -0,0 +1,67 @@
+/* Overflow tests for stat, statfs, and lseek functions.
+   Copyright (C) 2020 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 <sys/stat.h>
+#include <sys/statfs.h>
+
+/* Test for overflows of structures where we ask the kernel to fill them
+   in with standard 64-bit syscalls but return them through APIs that
+   only expose the low 32 bits of some fields.  */
+
+static inline off_t lseek_overflow (loff_t res)
+{
+  off_t retval = (off_t) res;
+  if (retval == res)
+    return retval;
+
+  __set_errno (EOVERFLOW);
+  return (off_t) -1;
+}
+
+static inline int stat_overflow (struct stat *buf)
+{
+#if defined __INO_T_MATCHES_INO64_T || !STAT_IS_KERNEL_STAT
+  return 0;
+#else
+  if (buf->__st_ino_pad == 0 && buf->__st_size_pad == 0
+      && buf->__st_blocks_pad == 0)
+    return 0;
+
+  __set_errno (EOVERFLOW);
+  return -1;
+#endif
+}
+
+/* Note that f_files and f_ffree may validly be a sign-extended -1.  */
+static inline int statfs_overflow (struct statfs *buf)
+{
+#if __STATFS_MATCHES_STATFS64 || !STAT_IS_KERNEL_STAT
+  return 0;
+#else
+  if (buf->__f_blocks_pad == 0 && buf->__f_bfree_pad == 0
+      && buf->__f_bavail_pad == 0
+      && (buf->__f_files_pad == 0
+	  || (buf->f_files == -1U && buf->__f_files_pad == -1))
+      && (buf->__f_ffree_pad == 0
+	  || (buf->f_ffree == -1U && buf->__f_ffree_pad == -1)))
+    return 0;
+
+  __set_errno (EOVERFLOW);
+  return -1;
+#endif
+}