decouple struct stat from kernel type

presently, all archs/ABIs have struct stat matching the kernel
stat[64] type, except mips/mipsn32/mips64 which do conversion hacks in
syscall_arch.h to work around bugs in the kernel type. this patch
completely decouples them and adds a translation step to the success
path of fstatat. at present, this is just a gratuitous copying, but it
opens up multiple possibilities for future support for 64-bit time_t
on 32-bit archs and for cleaned-up/unified ABIs.

for clarity, the mips hacks are not yet removed in this commit, so the
mips kstat structs still correspond to the output of the hacks in
their syscall_arch.h files, not the raw kernel type. a subsequent
commit will fix this.

17 files changed, 364 insertions, 4 deletions

diff --git a/arch/aarch64/kstat.h b/arch/aarch64/kstat.h
new file mode 100644
index 00000000..92625f36
--- /dev/null
+++ b/arch/aarch64/kstat.h
@@ -0,0 +1,21 @@
+struct kstat {
+	dev_t st_dev;
+	ino_t st_ino;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	unsigned long __pad;
+	off_t st_size;
+	blksize_t st_blksize;
+	int __pad2;
+	blkcnt_t st_blocks;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	unsigned __unused[2];
+};
diff --git a/arch/arm/kstat.h b/arch/arm/kstat.h
new file mode 100644
index 00000000..af449c95
--- /dev/null
+++ b/arch/arm/kstat.h
@@ -0,0 +1,21 @@
+struct kstat {
+	dev_t st_dev;
+	int __st_dev_padding;
+	long __st_ino_truncated;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	int __st_rdev_padding;
+	off_t st_size;
+	blksize_t st_blksize;
+	blkcnt_t st_blocks;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	ino_t st_ino;
+};
diff --git a/arch/i386/kstat.h b/arch/i386/kstat.h
new file mode 100644
index 00000000..af449c95
--- /dev/null
+++ b/arch/i386/kstat.h
@@ -0,0 +1,21 @@
+struct kstat {
+	dev_t st_dev;
+	int __st_dev_padding;
+	long __st_ino_truncated;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	int __st_rdev_padding;
+	off_t st_size;
+	blksize_t st_blksize;
+	blkcnt_t st_blocks;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	ino_t st_ino;
+};
diff --git a/arch/m68k/kstat.h b/arch/m68k/kstat.h
new file mode 100644
index 00000000..ac13e272
--- /dev/null
+++ b/arch/m68k/kstat.h
@@ -0,0 +1,21 @@
+struct kstat {
+	dev_t st_dev;
+	short __st_dev_padding;
+	long __st_ino_truncated;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	short __st_rdev_padding;
+	off_t st_size;
+	blksize_t st_blksize;
+	blkcnt_t st_blocks;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	ino_t st_ino;
+};
diff --git a/arch/microblaze/kstat.h b/arch/microblaze/kstat.h
new file mode 100644
index 00000000..c1449579
--- /dev/null
+++ b/arch/microblaze/kstat.h
@@ -0,0 +1,21 @@
+struct kstat {
+	dev_t st_dev;
+	ino_t st_ino;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	long long __st_rdev_padding;
+	off_t st_size;
+	blksize_t st_blksize;
+	int __st_blksize_padding;
+	blkcnt_t st_blocks;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	unsigned __unused[2];
+};
diff --git a/arch/mips/kstat.h b/arch/mips/kstat.h
new file mode 100644
index 00000000..96e4ea34
--- /dev/null
+++ b/arch/mips/kstat.h
@@ -0,0 +1,22 @@
+struct kstat {
+	dev_t st_dev;
+	long __st_padding1[2];
+	ino_t st_ino;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	long __st_padding2[2];
+	off_t st_size;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	blksize_t st_blksize;
+	long __st_padding3;
+	blkcnt_t st_blocks;
+        long __st_padding4[14];
+};
diff --git a/arch/mips64/kstat.h b/arch/mips64/kstat.h
new file mode 100644
index 00000000..74cb5a08
--- /dev/null
+++ b/arch/mips64/kstat.h
@@ -0,0 +1,23 @@
+struct kstat {
+	dev_t st_dev;
+	int __pad1[3];
+	ino_t st_ino;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	unsigned int __pad2[2];
+	off_t st_size;
+	int __pad3;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	blksize_t st_blksize;
+	unsigned int __pad4;
+	blkcnt_t st_blocks;
+	int __pad5[14];
+};
diff --git a/arch/mipsn32/kstat.h b/arch/mipsn32/kstat.h
new file mode 100644
index 00000000..7be515c8
--- /dev/null
+++ b/arch/mipsn32/kstat.h
@@ -0,0 +1,22 @@
+struct kstat {
+	dev_t st_dev;
+	long __pad1[2];
+	ino_t st_ino;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	long __pad2[2];
+	off_t st_size;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	blksize_t st_blksize;
+	long __pad3;
+	blkcnt_t st_blocks;
+	long __pad4[14];
+};
diff --git a/arch/or1k/kstat.h b/arch/or1k/kstat.h
new file mode 100644
index 00000000..c1449579
--- /dev/null
+++ b/arch/or1k/kstat.h
@@ -0,0 +1,21 @@
+struct kstat {
+	dev_t st_dev;
+	ino_t st_ino;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	long long __st_rdev_padding;
+	off_t st_size;
+	blksize_t st_blksize;
+	int __st_blksize_padding;
+	blkcnt_t st_blocks;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	unsigned __unused[2];
+};
diff --git a/arch/powerpc/kstat.h b/arch/powerpc/kstat.h
new file mode 100644
index 00000000..5a611e7b
--- /dev/null
+++ b/arch/powerpc/kstat.h
@@ -0,0 +1,20 @@
+struct kstat {
+	dev_t st_dev;
+	ino_t st_ino;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	short __st_rdev_padding;
+	off_t st_size;
+	blksize_t st_blksize;
+	blkcnt_t st_blocks;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	unsigned __unused[2];
+};
diff --git a/arch/powerpc64/kstat.h b/arch/powerpc64/kstat.h
new file mode 100644
index 00000000..887b3e26
--- /dev/null
+++ b/arch/powerpc64/kstat.h
@@ -0,0 +1,19 @@
+struct kstat {
+	dev_t st_dev;
+	ino_t st_ino;
+	nlink_t st_nlink;
+	mode_t st_mode;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	off_t st_size;
+	blksize_t st_blksize;
+	blkcnt_t st_blocks;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	unsigned long __unused[3];
+};
diff --git a/arch/riscv64/kstat.h b/arch/riscv64/kstat.h
new file mode 100644
index 00000000..92625f36
--- /dev/null
+++ b/arch/riscv64/kstat.h
@@ -0,0 +1,21 @@
+struct kstat {
+	dev_t st_dev;
+	ino_t st_ino;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	unsigned long __pad;
+	off_t st_size;
+	blksize_t st_blksize;
+	int __pad2;
+	blkcnt_t st_blocks;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	unsigned __unused[2];
+};
diff --git a/arch/s390x/kstat.h b/arch/s390x/kstat.h
new file mode 100644
index 00000000..001c10be
--- /dev/null
+++ b/arch/s390x/kstat.h
@@ -0,0 +1,19 @@
+struct kstat {
+	dev_t st_dev;
+	ino_t st_ino;
+	nlink_t st_nlink;
+	mode_t st_mode;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	off_t st_size;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	blksize_t st_blksize;
+	blkcnt_t st_blocks;
+	unsigned long __unused[3];
+};
diff --git a/arch/sh/kstat.h b/arch/sh/kstat.h
new file mode 100644
index 00000000..af449c95
--- /dev/null
+++ b/arch/sh/kstat.h
@@ -0,0 +1,21 @@
+struct kstat {
+	dev_t st_dev;
+	int __st_dev_padding;
+	long __st_ino_truncated;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	int __st_rdev_padding;
+	off_t st_size;
+	blksize_t st_blksize;
+	blkcnt_t st_blocks;
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	ino_t st_ino;
+};
diff --git a/arch/x32/kstat.h b/arch/x32/kstat.h
new file mode 100644
index 00000000..ce25fce3
--- /dev/null
+++ b/arch/x32/kstat.h
@@ -0,0 +1,22 @@
+struct kstat {
+	dev_t st_dev;
+	ino_t st_ino;
+	nlink_t st_nlink;
+
+	mode_t st_mode;
+	uid_t st_uid;
+	gid_t st_gid;
+	unsigned int    __pad0;
+	dev_t st_rdev;
+	off_t st_size;
+	blksize_t st_blksize;
+	blkcnt_t st_blocks;
+
+	long long st_atime_sec;
+	long st_atime_nsec;
+	long long st_mtime_sec;
+	long st_mtime_nsec;
+	long long st_ctime_sec;
+	long st_ctime_nsec;
+	long long __unused[3];
+};
diff --git a/arch/x86_64/kstat.h b/arch/x86_64/kstat.h
new file mode 100644
index 00000000..5976c04e
--- /dev/null
+++ b/arch/x86_64/kstat.h
@@ -0,0 +1,22 @@
+struct kstat {
+	dev_t st_dev;
+	ino_t st_ino;
+	nlink_t st_nlink;
+
+	mode_t st_mode;
+	uid_t st_uid;
+	gid_t st_gid;
+	unsigned int    __pad0;
+	dev_t st_rdev;
+	off_t st_size;
+	blksize_t st_blksize;
+	blkcnt_t st_blocks;
+
+	long st_atime_sec;
+	long st_atime_nsec;
+	long st_mtime_sec;
+	long st_mtime_nsec;
+	long st_ctime_sec;
+	long st_ctime_nsec;
+	long __unused[3];
+};
diff --git a/src/stat/fstatat.c b/src/stat/fstatat.c
index f5bc3685..29d63343 100644
--- a/src/stat/fstatat.c
+++ b/src/stat/fstatat.c
@@ -4,10 +4,12 @@
 #include <fcntl.h>
 #include <errno.h>
 #include "syscall.h"
+#include "kstat.h"
 
 int fstatat(int fd, const char *restrict path, struct stat *restrict st, int flag)
 {
 	int ret;
+	struct kstat kst;
 
 	if (flag==AT_EMPTY_PATH && fd>=0 && !*path) {
 		ret = __syscall(SYS_fstat, fd, st);
@@ -26,15 +28,36 @@ int fstatat(int fd, const char *restrict path, struct stat *restrict st, int fla
 	}
 #ifdef SYS_lstat
 	else if ((fd == AT_FDCWD || *path=='/') && flag==AT_SYMLINK_NOFOLLOW)
-		ret = __syscall(SYS_lstat, path, st);
+		ret = __syscall(SYS_lstat, path, &kst);
 #endif
 #ifdef SYS_stat
 	else if ((fd == AT_FDCWD || *path=='/') && !flag)
-		ret = __syscall(SYS_stat, path, st);
+		ret = __syscall(SYS_stat, path, &kst);
 #endif
-	else ret = __syscall(SYS_fstatat, fd, path, st, flag);
+	else ret = __syscall(SYS_fstatat, fd, path, &kst, flag);
 
-	return __syscall_ret(ret);
+	if (ret) return __syscall_ret(ret);
+
+	*st = (struct stat){
+		.st_dev = kst.st_dev,
+		.st_ino = kst.st_ino,
+		.st_mode = kst.st_mode,
+		.st_nlink = kst.st_nlink,
+		.st_uid = kst.st_uid,
+		.st_gid = kst.st_gid,
+		.st_rdev = kst.st_rdev,
+		.st_size = kst.st_size,
+		.st_blksize = kst.st_blksize,
+		.st_blocks = kst.st_blocks,
+		.st_atim.tv_sec = kst.st_atime_sec,
+		.st_atim.tv_nsec = kst.st_atime_nsec,
+		.st_mtim.tv_sec = kst.st_mtime_sec,
+		.st_mtim.tv_nsec = kst.st_mtime_nsec,
+		.st_ctim.tv_sec = kst.st_ctime_sec,
+		.st_ctim.tv_nsec = kst.st_ctime_nsec,
+	};
+
+	return 0;
 }
 
 weak_alias(fstatat, fstatat64);