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71aadfb8ae
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>
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* xstat using old-style Unix stat system call.
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Copyright (C) 1991-2020 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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#include <sys/stat.h>
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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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#if !XSTAT_IS_XSTAT64
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# include <xstatconv.h>
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# include <xstatover.h>
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/* Get information about the file NAME in BUF. */
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int
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__xstat (int vers, const char *name, struct stat *buf)
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{
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switch (vers)
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{
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case _STAT_VER_KERNEL:
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{
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# if STAT_IS_KERNEL_STAT
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/* New kABIs which uses generic pre 64-bit time Linux ABI,
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e.g. csky, nios2 */
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int r = INLINE_SYSCALL_CALL (fstatat64, AT_FDCWD, name, buf, 0);
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return r ?: stat_overflow (buf);
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# else
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/* Old kABIs with old non-LFS support, e.g. arm, i386, hppa, m68k,
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microblaze, s390, sh, powerpc, and sparc32. */
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return INLINE_SYSCALL_CALL (stat, name, buf);
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# endif
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}
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default:
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{
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# if STAT_IS_KERNEL_STAT
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return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
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# else
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struct stat64 buf64;
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int r = INLINE_SYSCALL_CALL (stat64, name, &buf64);
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return r ?: __xstat32_conv (vers, &buf64, buf);
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#endif
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}
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}
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}
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hidden_def (__xstat)
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#endif /* XSTAT_IS_XSTAT64 */
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