[PATCH] Add _sigsys info to siginfo struct

[Hannes Domani <ssbssa@yahoo.de>]

This patch adds information about _sigsys structure from newer
kernels, so that $_siginfo decoding can show information about
_sigsys, making it easier for developers to debug seccomp failures.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=24283
---
 gdb/linux-tdep.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c
index 927e69bf1e1..fb2abdd1a21 100644
--- a/gdb/linux-tdep.c
+++ b/gdb/linux-tdep.c
@@ -379,6 +379,13 @@ linux_get_siginfo_type_with_fields (struct gdbarch *gdbarch,
   append_composite_type_field (type, "si_fd", int_type);
   append_composite_type_field (sifields_type, "_sigpoll", type);
 
+  /* _sigsys */
+  type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
+  append_composite_type_field (type, "_call_addr", void_ptr_type);
+  append_composite_type_field (type, "_syscall", int_type);
+  append_composite_type_field (type, "_arch", uint_type);
+  append_composite_type_field (sifields_type, "_sigsys", type);
+
   /* struct siginfo */
   siginfo_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
   siginfo_type->set_name (xstrdup ("siginfo"));
-- 
2.34.1