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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/fxstat64.c | |
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/fxstat64.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/fxstat64.c | 53 |
1 files changed, 38 insertions, 15 deletions
diff --git a/sysdeps/unix/sysv/linux/fxstat64.c b/sysdeps/unix/sysv/linux/fxstat64.c index 9133a0a29b..330af75f11 100644 --- a/sysdeps/unix/sysv/linux/fxstat64.c +++ b/sysdeps/unix/sysv/linux/fxstat64.c @@ -16,15 +16,13 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#include <errno.h> -#include <stddef.h> -#include <fcntl.h> +#define __fxstat __redirect___fxstat #include <sys/stat.h> +#undef __fxstat +#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 FD in BUF. */ @@ -32,17 +30,37 @@ int ___fxstat64 (int vers, int fd, struct stat64 *buf) { - int result; -#ifdef __NR_fstat64 - result = INLINE_SYSCALL (fstat64, 2, fd, buf); -#else +#if XSTAT_IS_XSTAT64 +# ifdef __NR_fstat64 + /* 64-bit kABI outlier, e.g. sparc64. */ + if (vers == _STAT_VER_KERNEL) + return INLINE_SYSCALL_CALL (fstat, fd, buf); + else + { + struct stat64 st64; + int r = INLINE_SYSCALL_CALL (fstat64, fd, &st64); + return r ?: __xstat32_conv (vers, &st64, (struct stat *) buf); + } +# elif defined __NR_fstat + /* 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 (fstat, fd, buf); + return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL); +# else + /* New 32-bit kABIs with only 64-bit time_t support, e.g. arc, riscv32. */ struct statx tmp; - result = INLINE_SYSCALL (statx, 5, fd, "", AT_EMPTY_PATH, STATX_BASIC_STATS, - &tmp); - if (result == 0) + int r = INLINE_SYSCALL_CALL (statx, fd, "", AT_EMPTY_PATH, + STATX_BASIC_STATS, &tmp); + if (r == 0) __cp_stat64_statx (buf, &tmp); -#endif - return result; + return r; +# endif +#else + /* All kABIs with non-LFS support, e.g. arm, csky, i386, hppa, m68k, + microblaze, mips32, nios2, sh, powerpc32, and sparc32. */ + return INLINE_SYSCALL_CALL (fstat64, fd, buf); +#endif /* XSTAT_IS_XSTAT64 */ } #include <shlib-compat.h> @@ -56,3 +74,8 @@ hidden_ver (___fxstat64, __fxstat64) strong_alias (___fxstat64, __fxstat64) hidden_def (__fxstat64) #endif + +#if XSTAT_IS_XSTAT64 +strong_alias (__fxstat64, __fxstat); +hidden_ver (__fxstat64, __fxstat) +#endif |