LoongArch: Linux Syscall Interface

1 files changed, 53 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/loongarch/sysdep.S b/sysdeps/unix/sysv/linux/loongarch/sysdep.S
new file mode 100644
index 0000000000..a4db2a97b5
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/sysdep.S
@@ -0,0 +1,53 @@
+/* syscall error handlers
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#if IS_IN (libc)
+# define errno __libc_errno
+#endif
+
+ENTRY (__syscall_error)
+/* Fall through to __syscall_set_errno */
+END (__syscall_error)
+
+/* Non-standard calling convention: argument in a0, return address in t0,
+   and clobber only t1.
+ */
+ENTRY (__syscall_set_errno)
+
+/* We got here because a0 < 0, but only codes in the range [-4095, -1]
+   represent errors.  Otherwise, just return the result normally.
+ */
+	li.d		t1, -4096
+	bgeu		t1, a0, L (out)
+	sub.w		a0, zero, a0
+#if RTLD_PRIVATE_ERRNO
+	la		t1, rtld_errno
+#elif defined(__PIC__)
+	la.tls.ie	t1, errno
+	add.d		t1, tp, t1
+#else
+	la.tls.le	t1, errno
+	add.d		t1, tp, t1
+#endif
+	st.w		a0, t1, 0
+	li.d		a0, -1
+L (out):
+	ret
+END (__syscall_set_errno)