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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-07-15 18:05:52 +0000 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-09-11 14:35:24 -0300 |
| commit | 5f85cc2f4712da0d8dd6f9ebf5f7c563e5b6ff3a (patch) | |
| tree | 195d87fa01218b0ae52066d215ecbd1528e329ce /sysdeps/unix/sysv/linux/fxstatat64.c | |
| parent | 5febe6a38ff2f87bdb8dd971632c97c916eafd9a (diff) | |
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linux: Consolidate fxstatat{64}
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>
Diffstat (limited to 'sysdeps/unix/sysv/linux/fxstatat64.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/fxstatat64.c | 65 |
1 files changed, 39 insertions, 26 deletions
diff --git a/sysdeps/unix/sysv/linux/fxstatat64.c b/sysdeps/unix/sysv/linux/fxstatat64.c index e24b456604..ac33ab4fc9 100644 --- a/sysdeps/unix/sysv/linux/fxstatat64.c +++ b/sysdeps/unix/sysv/linux/fxstatat64.c @@ -1,4 +1,5 @@ -/* Copyright (C) 2005-2020 Free Software Foundation, Inc. +/* fxstatat64 used on fstatat64, Linux implementation. + Copyright (C) 2005-2020 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 @@ -15,41 +16,53 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#include <errno.h> -#include <fcntl.h> -#include <stddef.h> -#include <stdio.h> -#include <string.h> +#define __fxstatat __redirect___fxstatat #include <sys/stat.h> +#undef __fxstatat +#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. */ +/* Get information about the file FD in BUF. */ int __fxstatat64 (int vers, int fd, const char *file, struct stat64 *st, int flag) { - if (__glibc_unlikely (vers != _STAT_VER_LINUX)) - return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL); - - int result; - -#ifdef __NR_fstatat64 - result = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, st, flag); +#if XSTAT_IS_XSTAT64 +# ifdef __NR_newfstatat + /* 64-bit kABI, e.g. aarch64, ia64, powerpc64*, s390x, riscv64, and + x86_64. */ + if (vers == _STAT_VER_KERNEL || vers == _STAT_VER_LINUX) + return INLINE_SYSCALL_CALL (newfstatat, fd, file, st, flag); +# elif defined __NR_fstatat64 + /* 64-bit kABI outlier, e.g. sparc64. */ + struct stat64 st64; + int r = INLINE_SYSCALL_CALL (fstatat64, fd, file, &st64, flag); + return r ?: __xstat32_conv (vers, &st64, (struct stat *) st); +# 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, fd, file, AT_NO_AUTOMOUNT | flag, + STATX_BASIC_STATS, &tmp); + if (r == 0) + __cp_stat64_statx (st, &tmp); + return r; + } +# endif #else - struct statx tmp; - - result = INTERNAL_SYSCALL_CALL (statx, fd, file, AT_NO_AUTOMOUNT | flag, - STATX_BASIC_STATS, &tmp); - if (result == 0) - __cp_stat64_statx (st, &tmp); + /* All kABIs with non-LFS support, e.g. arm, csky, i386, hppa, m68k, + microblaze, mips32, nios2, sh, powerpc32, and sparc32. */ + if (vers == _STAT_VER_LINUX) + return INLINE_SYSCALL_CALL (fstatat64, fd, file, st, flag); #endif - if (!__glibc_likely (INTERNAL_SYSCALL_ERROR_P (result))) - return 0; - return INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (result)); + return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL); } libc_hidden_def (__fxstatat64) +#if XSTAT_IS_XSTAT64 && IS_IN(libc) +strong_alias (__fxstatat64, __fxstatat); +hidden_ver (__fxstatat64, __fxstatat) +#endif |