This patch adds basic support for Z80-like CPUs.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index c7b743826e..c3a28714a3 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,15 @@
+2020-09-18  Sergey Belyashov  <sergey.belyashov@gmail.com>
+
+       * Makefile.in: Add Z80 platform support.
+       * configure.tgt: Add Z80 platform support.
+       * features/Makefile: Add Z80 platform support.
+       * features/z80-cpu.xml: Add Z80 platform support.
+       * features/z80.c: Add Z80 platform support.
+       * features/z80.xml: Add Z80 platform support.
+       * regformats/z80.dat: Add Z80 platform support.
+       * z80-tdep.c: New file.
+       * z80-tdep.h: New file.
+
 2020-09-18  Pedro Alves  <pedro@palves.net>

        PR gdb/26631
diff --git a/gdb/NEWS b/gdb/NEWS
index 0ac0ff18f2..e5c07e64f1 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -140,6 +140,7 @@ alias [-a] [--] ALIAS = COMMAND [DEFAULT-ARGS...]

 GNU/Linux/RISC-V (gdbserver)   riscv*-*-linux*
 BPF                            bpf-unknown-none
+Z80                            z80-unknown-*

 * Python API

diff --git a/gdb/stubs/ChangeLog b/gdb/stubs/ChangeLog
index a5cfae0604..516d8b2cc1 100644
--- a/gdb/stubs/ChangeLog
+++ b/gdb/stubs/ChangeLog
@@ -1,3 +1,7 @@
+2020-09-18  Sergey Belyashov  <sergey.belyashov@gmail.com>
+
+       * z80-stub.c: New file.
+
 2020-04-28  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

        * ia64vms-stub.c: Fix typo in comment (thead -> thread).