1 files changed, 65 insertions, 0 deletions
diff --git a/sysdeps/loongarch/start.S b/sysdeps/loongarch/start.S
new file mode 100644
index 0000000000..bf5728b3ae
--- /dev/null
+++ b/sysdeps/loongarch/start.S
@@ -0,0 +1,65 @@
+/* Startup code compliant to the ELF LoongArch ABI.
+   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/>.  */
+
+#define __ASSEMBLY__ 1
+#include <entry.h>
+#include <sys/asm.h>
+
+/* The entry point's job is to call __libc_start_main.  Per the ABI,
+   a0 contains the address of a function to be passed to atexit.
+   __libc_start_main wants this in a5.  */
+
+/*
+int
+__libc_start_main (int (*main) (int, char **, char **),
+		   int argc,
+		   char **argv,
+		   __typeof (main) init,
+		   void (*fini) (void),
+		   void (*rtld_fini) (void),
+		   void *stack_end);
+ */
+
+ENTRY (ENTRY_POINT)
+
+/* Terminate call stack by noting ra is undefined.  Use a dummy
+   .cfi_label to force starting the FDE.  */
+	.cfi_label .Ldummy
+	cfi_undefined (1)
+	or		a5, a0, zero /* rtld_fini */
+
+/* We must get symbol main through GOT table, since main may not be local.
+   For instance: googletest defines main in dynamic library.  */
+	la.got		a0, t0, main
+	REG_L		a1, sp, 0
+	ADDI		a2, sp, SZREG
+
+	/* Adjust $sp for 16-aligned */
+	BSTRINS		sp, zero, 3, 0
+
+	move		a3, zero /* used to be init */
+	move		a4, zero /* used to be fini */
+	or		a6, sp, zero /* stack_end */
+
+	la.got		ra, t0, __libc_start_main
+	jirl		ra, ra, 0
+
+	la.got		ra, t0, abort
+	jirl		ra, ra, 0
+END (ENTRY_POINT)