[PATCH v2 03/12] tools/nolibc: sys.h: remove the old sys_stat support

From: Zhangjin Wu
Date: Sat Jul 08 2023 - 11:29:10 EST

__NR_statx has been added from v4.10:

commit a528d35e8bfc ("statx: Add a system call to make enhanced file info available")

It has been supported by all of the platforms since at least from v4.20
and glibc 2.28.

Let's remove the old arch related and dependent sys_stat support
completely.

This is friendly to the future new architecture porting.

Signed-off-by: Zhangjin Wu <falcon@xxxxxxxxxxx>
---
tools/include/nolibc/aarch64/sys.h | 28 -------------
tools/include/nolibc/arm/sys.h | 37 ------------------
tools/include/nolibc/i386/sys.h | 26 ------------
tools/include/nolibc/mips/sys.h | 28 -------------
tools/include/nolibc/riscv/sys.h | 23 -----------
tools/include/nolibc/s390/sys.h | 25 ------------
tools/include/nolibc/sys.h | 63 ++++++------------------------
tools/include/nolibc/types.h | 4 +-
tools/include/nolibc/x86_64/sys.h | 27 -------------
9 files changed, 13 insertions(+), 248 deletions(-)

diff --git a/tools/include/nolibc/aarch64/sys.h b/tools/include/nolibc/aarch64/sys.h
index b79d6a35ec37..43df164b8796 100644
--- a/tools/include/nolibc/aarch64/sys.h
+++ b/tools/include/nolibc/aarch64/sys.h
@@ -7,34 +7,6 @@
#ifndef _NOLIBC_AARCH64_SYS_H
#define _NOLIBC_AARCH64_SYS_H

-/* The struct returned by the newfstatat() syscall. Differs slightly from the
- * x86_64's stat one by field ordering, so be careful.
- */
-struct sys_stat_struct {
- unsigned long st_dev;
- unsigned long st_ino;
- unsigned int st_mode;
- unsigned int st_nlink;
- unsigned int st_uid;
- unsigned int st_gid;
-
- unsigned long st_rdev;
- unsigned long __pad1;
- long st_size;
- int st_blksize;
- int __pad2;
-
- long st_blocks;
- long st_atime;
- unsigned long st_atime_nsec;
- long st_mtime;
-
- unsigned long st_mtime_nsec;
- long st_ctime;
- unsigned long st_ctime_nsec;
- unsigned int __unused[2];
-};
-
/* Syscalls for AARCH64 :
* - registers are 64-bit
* - stack is 16-byte aligned
diff --git a/tools/include/nolibc/arm/sys.h b/tools/include/nolibc/arm/sys.h
index 79173f860948..db8846ff3eda 100644
--- a/tools/include/nolibc/arm/sys.h
+++ b/tools/include/nolibc/arm/sys.h
@@ -7,43 +7,6 @@
#ifndef _NOLIBC_ARM_SYS_H
#define _NOLIBC_ARM_SYS_H

-/* The struct returned by the stat() syscall, 32-bit only, the syscall returns
- * exactly 56 bytes (stops before the unused array). In big endian, the format
- * differs as devices are returned as short only.
- */
-struct sys_stat_struct {
-#if defined(__ARMEB__)
- unsigned short st_dev;
- unsigned short __pad1;
-#else
- unsigned long st_dev;
-#endif
- unsigned long st_ino;
- unsigned short st_mode;
- unsigned short st_nlink;
- unsigned short st_uid;
- unsigned short st_gid;
-
-#if defined(__ARMEB__)
- unsigned short st_rdev;
- unsigned short __pad2;
-#else
- unsigned long st_rdev;
-#endif
- unsigned long st_size;
- unsigned long st_blksize;
- unsigned long st_blocks;
-
- unsigned long st_atime;
- unsigned long st_atime_nsec;
- unsigned long st_mtime;
- unsigned long st_mtime_nsec;
-
- unsigned long st_ctime;
- unsigned long st_ctime_nsec;
- unsigned long __unused[2];
-};
-
/* Syscalls for ARM in ARM or Thumb modes :
* - registers are 32-bit
* - stack is 8-byte aligned
diff --git a/tools/include/nolibc/i386/sys.h b/tools/include/nolibc/i386/sys.h
index c626cf2b145a..d2d0eeccb8fc 100644
--- a/tools/include/nolibc/i386/sys.h
+++ b/tools/include/nolibc/i386/sys.h
@@ -7,32 +7,6 @@
#ifndef _NOLIBC_I386_SYS_H
#define _NOLIBC_I386_SYS_H

-/* The struct returned by the stat() syscall, 32-bit only, the syscall returns
- * exactly 56 bytes (stops before the unused array).
- */
-struct sys_stat_struct {
- unsigned long st_dev;
- unsigned long st_ino;
- unsigned short st_mode;
- unsigned short st_nlink;
- unsigned short st_uid;
- unsigned short st_gid;
-
- unsigned long st_rdev;
- unsigned long st_size;
- unsigned long st_blksize;
- unsigned long st_blocks;
-
- unsigned long st_atime;
- unsigned long st_atime_nsec;
- unsigned long st_mtime;
- unsigned long st_mtime_nsec;
-
- unsigned long st_ctime;
- unsigned long st_ctime_nsec;
- unsigned long __unused[2];
-};
-
/* Syscalls for i386 :
* - mostly similar to x86_64
* - registers are 32-bit
diff --git a/tools/include/nolibc/mips/sys.h b/tools/include/nolibc/mips/sys.h
index 13dfbf3e6a3d..c3c245682e5d 100644
--- a/tools/include/nolibc/mips/sys.h
+++ b/tools/include/nolibc/mips/sys.h
@@ -7,34 +7,6 @@
#ifndef _NOLIBC_MIPS_SYS_H
#define _NOLIBC_MIPS_SYS_H

-/* The struct returned by the stat() syscall. 88 bytes are returned by the
- * syscall.
- */
-struct sys_stat_struct {
- unsigned int st_dev;
- long st_pad1[3];
- unsigned long st_ino;
- unsigned int st_mode;
- unsigned int st_nlink;
- unsigned int st_uid;
- unsigned int st_gid;
- unsigned int st_rdev;
- long st_pad2[2];
- long st_size;
- long st_pad3;
-
- long st_atime;
- long st_atime_nsec;
- long st_mtime;
- long st_mtime_nsec;
-
- long st_ctime;
- long st_ctime_nsec;
- long st_blksize;
- long st_blocks;
- long st_pad4[14];
-};
-
/* Syscalls for MIPS ABI O32 :
* - WARNING! there's always a delayed slot!
* - WARNING again, the syntax is different, registers take a '$' and numbers
diff --git a/tools/include/nolibc/riscv/sys.h b/tools/include/nolibc/riscv/sys.h
index aa15b86c919f..682bf9c0165b 100644
--- a/tools/include/nolibc/riscv/sys.h
+++ b/tools/include/nolibc/riscv/sys.h
@@ -7,29 +7,6 @@
#ifndef _NOLIBC_RISCV_SYS_H
#define _NOLIBC_RISCV_SYS_H

-struct sys_stat_struct {
- unsigned long st_dev; /* Device. */
- unsigned long st_ino; /* File serial number. */
- unsigned int st_mode; /* File mode. */
- unsigned int st_nlink; /* Link count. */
- unsigned int st_uid; /* User ID of the file's owner. */
- unsigned int st_gid; /* Group ID of the file's group. */
- unsigned long st_rdev; /* Device number, if device. */
- unsigned long __pad1;
- long st_size; /* Size of file, in bytes. */
- int st_blksize; /* Optimal block size for I/O. */
- int __pad2;
- long st_blocks; /* Number 512-byte blocks allocated. */
- long st_atime; /* Time of last access. */
- unsigned long st_atime_nsec;
- long st_mtime; /* Time of last modification. */
- unsigned long st_mtime_nsec;
- long st_ctime; /* Time of last status change. */
- unsigned long st_ctime_nsec;
- unsigned int __unused4;
- unsigned int __unused5;
-};
-
/* Syscalls for RISCV :
* - stack is 16-byte aligned
* - syscall number is passed in a7
diff --git a/tools/include/nolibc/s390/sys.h b/tools/include/nolibc/s390/sys.h
index 041f4ecb7922..4373c4dc1e8a 100644
--- a/tools/include/nolibc/s390/sys.h
+++ b/tools/include/nolibc/s390/sys.h
@@ -8,31 +8,6 @@
#include <asm/signal.h>
#include <asm/unistd.h>

-/* The struct returned by the stat() syscall, equivalent to stat64(). The
- * syscall returns 116 bytes and stops in the middle of __unused.
- */
-
-struct sys_stat_struct {
- unsigned long st_dev;
- unsigned long st_ino;
- unsigned long st_nlink;
- unsigned int st_mode;
- unsigned int st_uid;
- unsigned int st_gid;
- unsigned int __pad1;
- unsigned long st_rdev;
- unsigned long st_size;
- unsigned long st_atime;
- unsigned long st_atime_nsec;
- unsigned long st_mtime;
- unsigned long st_mtime_nsec;
- unsigned long st_ctime;
- unsigned long st_ctime_nsec;
- unsigned long st_blksize;
- long st_blocks;
- unsigned long __unused[3];
-};
-
/* Syscalls for s390:
* - registers are 64-bit
* - syscall number is passed in r1
diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index e84ed57f3a63..8c7fc9f5abd1 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -943,15 +943,19 @@ pid_t setsid(void)
return __sysret(sys_setsid());
}

-#if defined(__NR_statx)
/*
* int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf);
+ * int stat(const char *path, struct stat *buf);
*/

static __attribute__((unused))
int sys_statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf)
{
+#ifdef __NR_statx
return my_syscall5(__NR_statx, fd, path, flags, mask, buf);
+#else
+ return -ENOSYS;
+#endif
}

static __attribute__((unused))
@@ -959,24 +963,18 @@ int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *
{
return __sysret(sys_statx(fd, path, flags, mask, buf));
}
-#endif

-/*
- * int stat(const char *path, struct stat *buf);
- * Warning: the struct stat's layout is arch-dependent.
- */

-#if defined(__NR_statx) && !defined(__NR_newfstatat) && !defined(__NR_stat)
-/*
- * Maybe we can just use statx() when available for all architectures?
- */
static __attribute__((unused))
-int sys_stat(const char *path, struct stat *buf)
+int stat(const char *path, struct stat *buf)
{
struct statx statx;
long ret;

- ret = sys_statx(AT_FDCWD, path, AT_NO_AUTOMOUNT, STATX_BASIC_STATS, &statx);
+ ret = __sysret(sys_statx(AT_FDCWD, path, AT_NO_AUTOMOUNT, STATX_BASIC_STATS, &statx));
+ if (ret == -1)
+ return ret;
+
buf->st_dev = ((statx.stx_dev_minor & 0xff)
| (statx.stx_dev_major << 8)
| ((statx.stx_dev_minor & ~0xff) << 12));
@@ -997,47 +995,8 @@ int sys_stat(const char *path, struct stat *buf)
buf->st_mtim.tv_nsec = statx.stx_mtime.tv_nsec;
buf->st_ctim.tv_sec = statx.stx_ctime.tv_sec;
buf->st_ctim.tv_nsec = statx.stx_ctime.tv_nsec;
- return ret;
-}
-#else
-static __attribute__((unused))
-int sys_stat(const char *path, struct stat *buf)
-{
- struct sys_stat_struct stat;
- long ret;
-
-#ifdef __NR_newfstatat
- /* only solution for arm64 */
- ret = my_syscall4(__NR_newfstatat, AT_FDCWD, path, &stat, 0);
-#elif defined(__NR_stat)
- ret = my_syscall2(__NR_stat, path, &stat);
-#else
- return -ENOSYS;
-#endif
- buf->st_dev = stat.st_dev;
- buf->st_ino = stat.st_ino;
- buf->st_mode = stat.st_mode;
- buf->st_nlink = stat.st_nlink;
- buf->st_uid = stat.st_uid;
- buf->st_gid = stat.st_gid;
- buf->st_rdev = stat.st_rdev;
- buf->st_size = stat.st_size;
- buf->st_blksize = stat.st_blksize;
- buf->st_blocks = stat.st_blocks;
- buf->st_atim.tv_sec = stat.st_atime;
- buf->st_atim.tv_nsec = stat.st_atime_nsec;
- buf->st_mtim.tv_sec = stat.st_mtime;
- buf->st_mtim.tv_nsec = stat.st_mtime_nsec;
- buf->st_ctim.tv_sec = stat.st_ctime;
- buf->st_ctim.tv_nsec = stat.st_ctime_nsec;
- return ret;
-}
-#endif

-static __attribute__((unused))
-int stat(const char *path, struct stat *buf)
-{
- return __sysret(sys_stat(path, buf));
+ return 0;
}


diff --git a/tools/include/nolibc/types.h b/tools/include/nolibc/types.h
index 23963e48d8ee..8cfc4c860fa4 100644
--- a/tools/include/nolibc/types.h
+++ b/tools/include/nolibc/types.h
@@ -15,8 +15,8 @@


/* Only the generic macros and types may be defined here. The arch-specific
- * ones such as the O_RDONLY and related macros used by fcntl() and open(), or
- * the layout of sys_stat_struct must not be defined here.
+ * ones such as the O_RDONLY and related macros used by fcntl() and open()
+ * must not be defined here.
*/

/* stat flags (WARNING, octal here). We need to check for an existing
diff --git a/tools/include/nolibc/x86_64/sys.h b/tools/include/nolibc/x86_64/sys.h
index c761c97dccf8..ac3e8811b7d1 100644
--- a/tools/include/nolibc/x86_64/sys.h
+++ b/tools/include/nolibc/x86_64/sys.h
@@ -7,33 +7,6 @@
#ifndef _NOLIBC_X86_64_SYS_H
#define _NOLIBC_X86_64_SYS_H

-/* The struct returned by the stat() syscall, equivalent to stat64(). The
- * syscall returns 116 bytes and stops in the middle of __unused.
- */
-struct sys_stat_struct {
- unsigned long st_dev;
- unsigned long st_ino;
- unsigned long st_nlink;
- unsigned int st_mode;
- unsigned int st_uid;
-
- unsigned int st_gid;
- unsigned int __pad0;
- unsigned long st_rdev;
- long st_size;
- long st_blksize;
-
- long st_blocks;
- unsigned long st_atime;
- unsigned long st_atime_nsec;
- unsigned long st_mtime;
-
- unsigned long st_mtime_nsec;
- unsigned long st_ctime;
- unsigned long st_ctime_nsec;
- long __unused[3];
-};
-
/* Syscalls for x86_64 :
* - registers are 64-bit
* - syscall number is passed in rax
--
2.25.1