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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-07-15 14:08:13 +0000 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-09-11 14:35:15 -0300 |
commit | 4f40e6adc4d00176bf11d7ad51dd67234c8cecc7 (patch) | |
tree | b4495cad7607cbcda66ca0c2b48243d3e2314d67 /sysdeps/unix/sysv/linux/i386/lxstat.c | |
parent | 71aadfb8aef6e2c944fbcbc3c9646e08bfb2fb08 (diff) | |
download | glibc-4f40e6adc4d00176bf11d7ad51dd67234c8cecc7.zip glibc-4f40e6adc4d00176bf11d7ad51dd67234c8cecc7.tar.gz glibc-4f40e6adc4d00176bf11d7ad51dd67234c8cecc7.tar.bz2 |
linux: Consolidate lxstat{64}
The LFS support is implemented on lxstat64.c, instead of lxstat.c for
64-bit architectures. The xstat.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_fstat64 with AT_SYMLINK_NOFOLLOW plus handles
the possible overflow off 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_lstat, otherwise it isseus __NR_lstat64 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 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, sparc64, x86_64): it
issues __NR_lstat for _STAT_VER_KERNEL or _STAT_VER_LINUX.
1.2. Old 64-bit kABI with defines __NR_lstat64 instead of __NR_lstat
(sparc64): it issues __NR_lstat for _STAT_VER_KERNEL or
__NR_lstat64 and convert to struct stat64.
1.3. New kABIs which uses generic 64-bit Linux ABI (aarch64 and
riscv64): it issues __NR_newfstatat with AT_SYMLINK_NOFOLLOW
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_lstat64.
Also, two special cases requires specific LFS implementations:
1. alpha: it requires to handle _STAT_VER_KERNEL64 to issue
__NR_lstat64 and use the kernel_stat with __NR_lstat otherwise.
2. mips64: as for non-LFS implementation its ABIs differ from
glibc exported one, which requires a 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/lxstat.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/i386/lxstat.c | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/lxstat.c b/sysdeps/unix/sysv/linux/i386/lxstat.c deleted file mode 100644 index e960077..0000000 --- a/sysdeps/unix/sysv/linux/i386/lxstat.c +++ /dev/null @@ -1,60 +0,0 @@ -/* lxstat using old-style Unix lstat 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 __lxstat64 __lxstat64_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 -__lxstat (int vers, const char *name, struct stat *buf) -{ - int result; - - if (vers == _STAT_VER_KERNEL) - return INLINE_SYSCALL (lstat, 2, name, buf); - - { - struct stat64 buf64; - - result = INTERNAL_SYSCALL_CALL (lstat64, 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 (__lxstat) -weak_alias (__lxstat, _lxstat); -#if XSTAT_IS_XSTAT64 -#undef __lxstat64 -strong_alias (__lxstat, __lxstat64); -hidden_ver (__lxstat, __lxstat64) -#endif |