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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-07-15 16:34:47 +0000 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-09-11 14:35:20 -0300 |
commit | 5febe6a38ff2f87bdb8dd971632c97c916eafd9a (patch) | |
tree | bd57e798673dae821922e3449a1fa118d6bc65cf /sysdeps/unix/sysv/linux/i386 | |
parent | 4f40e6adc4d00176bf11d7ad51dd67234c8cecc7 (diff) | |
download | glibc-5febe6a38ff2f87bdb8dd971632c97c916eafd9a.tar.gz glibc-5febe6a38ff2f87bdb8dd971632c97c916eafd9a.tar.xz glibc-5febe6a38ff2f87bdb8dd971632c97c916eafd9a.zip |
linux: Consolidate fxstat{64}
The LFS support is implemented on fxstat64.c, instead of fxstat.c for 64-bit architectures. The fxstat.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 issuess __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_fstat, otherwise it calls __NR_fstat64 and convert to non-LFS stat struct and handle possible overflows on st_ino, st_size, or st_blocks. Also 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 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 issuess __NR_fstat for _STAT_VER_KERNEL or _STAT_VER_LINUX. 1.2. Old 64-bit kABI with defines __NR_fstat64 instead of __NR_fstat (sparc64): it issues __NR_fstat for _STAT_VER_KERNEL or __NR_fstat64 and convert to struct stat64. 1.3. New 32-bit kABIs with only 64-bit time_t support (arc and riscv32): it issuess __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 requires to handle _STAT_VER_KERNEL64 to issues __NR_fstat64 and use the kernel_stat with __NR_fstat 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>
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386')
-rw-r--r-- | sysdeps/unix/sysv/linux/i386/fxstat.c | 59 |
1 files changed, 0 insertions, 59 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/fxstat.c b/sysdeps/unix/sysv/linux/i386/fxstat.c deleted file mode 100644 index db59baa71b..0000000000 --- a/sysdeps/unix/sysv/linux/i386/fxstat.c +++ /dev/null @@ -1,59 +0,0 @@ -/* fxstat using old-style Unix fstat 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 __fxstat64 __fxstat64_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 FD in BUF. */ -int -__fxstat (int vers, int fd, struct stat *buf) -{ - int result; - - if (vers == _STAT_VER_KERNEL) - return INLINE_SYSCALL (fstat, 2, fd, buf); - - { - struct stat64 buf64; - - result = INTERNAL_SYSCALL_CALL (fstat64, fd, &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 (__fxstat) -weak_alias (__fxstat, _fxstat); -#if XSTAT_IS_XSTAT64 -#undef __fxstat64 -strong_alias (__fxstat, __fxstat64); -hidden_ver (__fxstat, __fxstat64) -#endif |