1 files changed, 71 insertions, 0 deletions
diff --git a/src/loongarch64/Gis_signal_frame.c b/src/loongarch64/Gis_signal_frame.c
new file mode 100644
index 00000000..bf7677d5
--- /dev/null
+++ b/src/loongarch64/Gis_signal_frame.c
@@ -0,0 +1,71 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2008 CodeSourcery
+   Copyright (C) 2021 Loongson Technology Corporation Limited
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+#include "unwind_i.h"
+#include <stdio.h>
+
+/*
+  arch/loongarch/vdso/sigreturn.S:
+
+  0000000000000000 <__vdso_rt_sigreturn>:
+     0:	03822c0b 	ori	$r11,$r0,0x8b
+     4:	002b0000 	syscall	0x0
+*/
+
+#define SIGRETURN_W0    0x03822c0b
+#define SIGRETURN_W1    0x002b0000
+
+int
+unw_is_signal_frame (unw_cursor_t *cursor)
+{
+  struct cursor *c = (struct cursor *) cursor;
+  unw_word_t w0, w1, ip;
+  unw_addr_space_t as;
+  unw_accessors_t *a;
+  void *arg;
+  int ret;
+
+  as = c->dwarf.as;
+  a = unw_get_accessors (as);
+  arg = c->dwarf.as_arg;
+
+  ip = c->dwarf.ip;
+
+  /* syscall 0x0 */
+  if ((ret = (*a->access_mem) (as, ip + 4, &w1, 0, arg)) < 0)
+    return ret;
+
+  /* ori a7,zero,0x8b */
+  if ((ret = (*a->access_mem) (as, ip, &w0, 0, arg)) < 0)
+    return ret;
+
+  if ((w1 & 0xffffffff) == SIGRETURN_W1 && (w0 & 0xffffffff) == SIGRETURN_W0)
+    {
+      Debug (8, "cursor at signal frame\n");
+      return 1;
+    }
+
+    return 0;
+}