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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>
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| .. | ||
| ____longjmp_chk.c | ||
| __makecontext_ret.S | ||
| arch-syscall.h | ||
| c++-types.data | ||
| clone.S | ||
| fxstat.c | ||
| fxstatat.c | ||
| getcontext.S | ||
| getutent_r.c | ||
| getutent.c | ||
| getutid_r.c | ||
| getutid.c | ||
| getutline_r.c | ||
| getutline.c | ||
| getutmp.c | ||
| getutxent.c | ||
| getutxid.c | ||
| getutxline.c | ||
| glob64-lstat-compat.c | ||
| jmp_buf-macros.h | ||
| ld.abilist | ||
| libBrokenLocale.abilist | ||
| libc.abilist | ||
| libcrypt.abilist | ||
| libdl.abilist | ||
| libm.abilist | ||
| libnsl.abilist | ||
| libpthread.abilist | ||
| libresolv.abilist | ||
| librt.abilist | ||
| libthread_db.abilist | ||
| libutil.abilist | ||
| login32.c | ||
| login.c | ||
| lxstat.c | ||
| makecontext.c | ||
| Makefile | ||
| oldglob.c | ||
| posix_fadvise64.c | ||
| pututxline.c | ||
| register-dump.h | ||
| setcontext.S | ||
| swapcontext.S | ||
| syscall.S | ||
| syscalls.list | ||
| sysdep.h | ||
| sysdep.S | ||
| updwtmp.c | ||
| updwtmpx.c | ||
| utmp32.c | ||
| utmp32.h | ||
| utmp-compat.h | ||
| utmp-convert.h | ||
| utmpx32.c | ||
| utmpx32.h | ||
| utmpx-convert.h | ||
| Versions | ||
| vfork.S | ||