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5f85cc2f47
The LFS support is implemented on fxstat64.c, instead of fxstat.c for
64-bit architectures. The fxstatat.c implements the non-LFS and it is
a no-op for !XSTAT_IS_XSTAT64.
The generic non-LFS implementation handles two cases:
1. New kABIs which uses generic pre 64-bit time Linux ABI (csky and
nios): it issues __NR_fstatat64 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, mips32,
microblaze, s390, sh, powerpc, and sparc32). it issues
__NR_fstatat64 and convert to non-LFS stat struct based on the
version.
Also non-LFS mips64 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 sysissues 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. 64-bit kABI (aarch64, ia64, powerpc64*, s390x, riscv64, and
x86_64): it issues __NR_newfstatat for _STAT_VER_KERNEL or
_STAT_VER_LINUX.
1.2. 64-bit kABI outlier (sparc64): it issuess fstatat64 with a
temporary stat64 and convert to output stat64 based on the
input version (and using a sparc64 specific __xstat32_conv).
1.3. 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 (arm, csky, i386, hppa, m68k,
microblaze, mips32, nios2, sh, powerpc32, and sparc32): it issues
__NR_fstat64.
Also, two special cases requires specific implementations:
1. alpha: it uses the __NR_fstatat64 syscall instead.
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>
69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/* fxstatat64 used on fstatat64, Linux implementation.
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Copyright (C) 2005-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#define __fxstatat __redirect___fxstatat
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#include <sys/stat.h>
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#undef __fxstatat
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#include <fcntl.h>
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#include <kernel_stat.h>
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#include <sysdep.h>
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#include <xstatconv.h>
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#include <statx_cp.h>
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/* Get information about the file FD in BUF. */
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int
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__fxstatat64 (int vers, int fd, const char *file, struct stat64 *st, int flag)
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{
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#if XSTAT_IS_XSTAT64
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# ifdef __NR_newfstatat
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/* 64-bit kABI, e.g. aarch64, ia64, powerpc64*, s390x, riscv64, and
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x86_64. */
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if (vers == _STAT_VER_KERNEL || vers == _STAT_VER_LINUX)
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return INLINE_SYSCALL_CALL (newfstatat, fd, file, st, flag);
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# elif defined __NR_fstatat64
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/* 64-bit kABI outlier, e.g. sparc64. */
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struct stat64 st64;
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int r = INLINE_SYSCALL_CALL (fstatat64, fd, file, &st64, flag);
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return r ?: __xstat32_conv (vers, &st64, (struct stat *) st);
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# else
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/* New 32-bit kABIs with only 64-bit time_t support, e.g. arc, riscv32. */
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if (vers == _STAT_VER_KERNEL)
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{
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struct statx tmp;
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int r = INLINE_SYSCALL_CALL (statx, fd, file, AT_NO_AUTOMOUNT | flag,
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STATX_BASIC_STATS, &tmp);
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if (r == 0)
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__cp_stat64_statx (st, &tmp);
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return r;
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}
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# endif
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#else
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/* All kABIs with non-LFS support, e.g. arm, csky, i386, hppa, m68k,
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microblaze, mips32, nios2, sh, powerpc32, and sparc32. */
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if (vers == _STAT_VER_LINUX)
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return INLINE_SYSCALL_CALL (fstatat64, fd, file, st, flag);
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#endif
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return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
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}
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libc_hidden_def (__fxstatat64)
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#if XSTAT_IS_XSTAT64 && IS_IN(libc)
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strong_alias (__fxstatat64, __fxstatat);
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hidden_ver (__fxstatat64, __fxstatat)
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#endif
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