add experimental aarch64 support

Ported over from GNU C Library and runtime tested in Qemu.

5 files changed, 42 insertions, 26 deletions

diff --git a/libc/sysdeps/linux/common/fstat.c b/libc/sysdeps/linux/common/fstat.c
index eae3c8006..ac77eb295 100644
--- a/libc/sysdeps/linux/common/fstat.c
+++ b/libc/sysdeps/linux/common/fstat.c
@@ -7,25 +7,26 @@
  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  */
 
-#include <sys/syscall.h>
+#include <features.h>
 #include <unistd.h>
 #include <sys/stat.h>
+#include <sys/syscall.h>
+
 #include "xstatconv.h"
 
 #if defined __NR_fstat64 && !defined __NR_fstat
 int fstat(int fd, struct stat *buf)
 {
-	int result = INLINE_SYSCALL(fstat64, 2, fd, buf);
-	if (result == 0) {
-		/* Did we overflow? */
-		if (buf->__pad1 || buf->__pad2 || buf->__pad3
-		    || buf->__pad4 || buf->__pad5
-		    || buf->__pad6 || buf->__pad7) {
-			__set_errno(EOVERFLOW);
-			return -1;
-		}
-	}
-	return result;
+	return INLINE_SYSCALL(fstat64, 2, fd, buf);
+}
+libc_hidden_def(fstat)
+
+#elif __WORDSIZE == 64 && defined __NR_newfstatat
+#include <fcntl.h>
+
+int fstat(int fd, struct stat *buf)
+{
+	return INLINE_SYSCALL(fstat, 2, fd, buf);
 }
 libc_hidden_def(fstat)
 
@@ -55,10 +56,9 @@ int fstat(int fd, struct stat *buf)
 	return result;
 }
 libc_hidden_def(fstat)
+#endif
 
 # if ! defined __NR_fstat64
 strong_alias_untyped(fstat,fstat64)
 libc_hidden_def(fstat64)
-# endif
-
 #endif
diff --git a/libc/sysdeps/linux/common/fstatat.c b/libc/sysdeps/linux/common/fstatat.c
index 4006814f0..13673d76c 100644
--- a/libc/sysdeps/linux/common/fstatat.c
+++ b/libc/sysdeps/linux/common/fstatat.c
@@ -26,15 +26,6 @@ int fstatat(int fd, const char *file, struct stat *buf, int flag)
 		__xstat32_conv(&kbuf, buf);
 # else
 	ret = INLINE_SYSCALL(fstatat64, 4, fd, file, buf, flag);
-	if (ret == 0) {
-		/* Did we overflow */
-		if (buf->__pad1 || buf->__pad2 || buf->__pad3
-		    || buf->__pad4 || buf->__pad5 || buf->__pad6
-		    || buf->__pad7) {
-			__set_errno(EOVERFLOW);
-			return -1;
-		}
-	}
 # endif /* __ARCH_HAS_DEPRECATED_SYSCALLS__ */
 	return ret;
 }
diff --git a/libc/sysdeps/linux/common/lstat.c b/libc/sysdeps/linux/common/lstat.c
index 143cc1916..cef9b463d 100644
--- a/libc/sysdeps/linux/common/lstat.c
+++ b/libc/sysdeps/linux/common/lstat.c
@@ -20,6 +20,15 @@ int lstat(const char *file_name, struct stat *buf)
 }
 libc_hidden_def(lstat)
 
+#elif __WORDSIZE == 64 && defined __NR_newfstatat
+# include <fcntl.h>
+
+int lstat(const char *file_name, struct stat *buf)
+{
+	return fstatat(AT_FDCWD, file_name, buf, AT_SYMLINK_NOFOLLOW);
+}
+libc_hidden_def(lstat)
+
 /* For systems which have both, prefer the old one */
 #else
 # include "xstatconv.h"
diff --git a/libc/sysdeps/linux/common/lstat64.c b/libc/sysdeps/linux/common/lstat64.c
index c43e53e1d..76637b556 100644
--- a/libc/sysdeps/linux/common/lstat64.c
+++ b/libc/sysdeps/linux/common/lstat64.c
@@ -9,11 +9,19 @@
 
 #include <_lfs_64.h>
 #include <sys/syscall.h>
+#include <unistd.h>
+#include <sys/stat.h>
 
-# include <unistd.h>
-# include <sys/stat.h>
+#if defined __NR_fstatat64 && !defined __NR_lstat
+# include <fcntl.h>
+
+int lstat64(const char *file_name, struct stat64 *buf)
+{
+	return fstatat64(AT_FDCWD, file_name, buf, AT_SYMLINK_NOFOLLOW);
+}
+libc_hidden_def(lstat64)
 
-#if defined __NR_fstatat64 && !defined __NR_lstat64
+#elif __WORDSIZE == 64 && defined __NR_newfstatat
 # include <fcntl.h>
 
 int lstat64(const char *file_name, struct stat64 *buf)
diff --git a/libc/sysdeps/linux/common/stat.c b/libc/sysdeps/linux/common/stat.c
index b3c2a19ea..8e4542a74 100644
--- a/libc/sysdeps/linux/common/stat.c
+++ b/libc/sysdeps/linux/common/stat.c
@@ -21,6 +21,14 @@ int stat(const char *file_name, struct stat *buf)
 	return fstatat(AT_FDCWD, file_name, buf, 0);
 }
 
+#elif __WORDSIZE == 64 && defined __NR_newfstatat
+# include <fcntl.h>
+
+int stat(const char *file_name, struct stat *buf)
+{
+	return fstatat64(AT_FDCWD, file_name, buf, 0);
+}
+
 #else
 # include "xstatconv.h"