gdb: Add OpenRISC or1k and or1knd target support

This patch prepares the current GDB port of the OpenRISC processor from
https://github.com/openrisc/binutils-gdb for upstream merging.

Testing has been done with a cgen sim provided in a separate patch. This
has been tested with 2 toolchains. GCC [1] 5.4.0 from the OpenRISC
project with Newlib [2] and GCC 5.4.0 with Musl [3] 1.1.4.

It supports or1knd (no delay slot target).
The default target is or1k (with delay slot).

You can change the target arch with:

(gdb) set architecture or1knd
The target architecture is assumed to be or1knd

[1] https://github.com/openrisc/or1k-gcc
[2] https://github.com/openrisc/newlib
[3] https://github.com/openrisc/musl-cross

gdb/doc/ChangeLog:

2017-12-12  Stafford Horne  <shorne@gmail.com>
	    Stefan Wallentowitz  <stefan@wallentowitz.de>
	    Franck Jullien  <franck.jullien@gmail.com>
	    Jeremy Bennett  <jeremy.bennett@embecosm.com>

	* gdb.texinfo: Add OpenRISC documentation.

gdb/ChangeLog:

2017-12-12  Stafford Horne  <shorne@gmail.com>
	    Stefan Wallentowitz  <stefan@wallentowitz.de>
	    Stefan Kristiansson  <stefan.kristiansson@saunalahti.fi>
	    Franck Jullien  <franck.jullien@gmail.com>
	    Jeremy Bennett  <jeremy.bennett@embecosm.com>

	* configure.tgt: Add targets for or1k and or1knd.
	* or1k-tdep.c: New file.
	* or1k-tdep.h: New file.
	* features/Makefile: Add or1k.xml to build.
	* features/or1k.xml: New file.
	* features/or1k-core.xml: New file.
	* features/or1k.c: Generated.

4 files changed, 156 insertions, 0 deletions

diff --git a/gdb/features/Makefile b/gdb/features/Makefile
index 73be34c313f..c78349eba93 100644
--- a/gdb/features/Makefile
+++ b/gdb/features/Makefile
@@ -93,6 +93,7 @@ mips64-expedite = r29,pc
 mips64-dsp-expedite = r29,pc
 microblaze-expedite = r1,rpc
 nios2-linux-expedite = sp,pc
+or1k-expedite = r1,npc
 powerpc-expedite = r1,pc
 rs6000/powerpc-cell32l-expedite = r1,pc,r0,orig_r3,r4
 rs6000/powerpc-cell64l-expedite = r1,pc,r0,orig_r3,r4
@@ -136,6 +137,7 @@ XMLTOC = \
 	mips64-linux.xml \
 	nds32.xml \
 	nios2.xml \
+	or1k.xml \
 	rs6000/powerpc-32.xml \
 	rs6000/powerpc-32l.xml \
 	rs6000/powerpc-403.xml \
diff --git a/gdb/features/or1k-core.xml b/gdb/features/or1k-core.xml
new file mode 100644
index 00000000000..1a9673d6c2b
--- /dev/null
+++ b/gdb/features/or1k-core.xml
@@ -0,0 +1,65 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2017 Free Software Foundation, Inc.
+
+     Copying and distribution of this file, with or without modification,
+     are permitted in any medium without royalty provided the copyright
+     notice and this notice are preserved.  -->
+
+<!DOCTYPE feature SYSTEM "gdb-target.dtd">
+<feature name="org.gnu.gdb.or1k.group0">
+  <reg name="r0" bitsize="32" type="int"/>
+  <reg name="r1" bitsize="32" type="data_ptr"/>
+  <reg name="r2" bitsize="32" type="data_ptr"/>
+  <reg name="r3" bitsize="32" type="int"/>
+  <reg name="r4" bitsize="32" type="int"/>
+  <reg name="r5" bitsize="32" type="int"/>
+  <reg name="r6" bitsize="32" type="int"/>
+  <reg name="r7" bitsize="32" type="int"/>
+  <reg name="r8" bitsize="32" type="int"/>
+  <reg name="r9" bitsize="32" type="code_ptr"/>
+  <reg name="r10" bitsize="32" type="int"/>
+  <reg name="r11" bitsize="32" type="int"/>
+  <reg name="r12" bitsize="32" type="int"/>
+  <reg name="r13" bitsize="32" type="int"/>
+  <reg name="r14" bitsize="32" type="int"/>
+  <reg name="r15" bitsize="32" type="int"/>
+  <reg name="r16" bitsize="32" type="int"/>
+  <reg name="r17" bitsize="32" type="int"/>
+  <reg name="r18" bitsize="32" type="int"/>
+  <reg name="r19" bitsize="32" type="int"/>
+  <reg name="r20" bitsize="32" type="int"/>
+  <reg name="r21" bitsize="32" type="int"/>
+  <reg name="r22" bitsize="32" type="int"/>
+  <reg name="r23" bitsize="32" type="int"/>
+  <reg name="r24" bitsize="32" type="int"/>
+  <reg name="r25" bitsize="32" type="int"/>
+  <reg name="r26" bitsize="32" type="int"/>
+  <reg name="r27" bitsize="32" type="int"/>
+  <reg name="r28" bitsize="32" type="int"/>
+  <reg name="r29" bitsize="32" type="int"/>
+  <reg name="r30" bitsize="32" type="int"/>
+  <reg name="r31" bitsize="32" type="int"/>
+  <reg name="ppc" bitsize="32" type="code_ptr"/>
+  <reg name="npc" bitsize="32" type="code_ptr"/>
+  <flags id="sr_flags" size="4">
+    <field name="SM" start="0" end="0"/>
+    <field name="TEE" start="1" end="1"/>
+    <field name="IEE" start="2" end="2"/>
+    <field name="DCE" start="3" end="3"/>
+    <field name="ICE" start="4" end="4"/>
+    <field name="DME" start="5" end="5"/>
+    <field name="IME" start="6" end="6"/>
+    <field name="LEE" start="7" end="7"/>
+    <field name="CE" start="8" end="8"/>
+    <field name="F" start="9" end="9"/>
+    <field name="CY" start="10" end="10"/>
+    <field name="OV" start="11" end="11"/>
+    <field name="OVE" start="12" end="12"/>
+    <field name="DSX" start="13" end="13"/>
+    <field name="EPH" start="14" end="14"/>
+    <field name="FO" start="15" end="15"/>
+    <field name="SUMRA" start="16" end="16"/>
+    <field name="CID" start="28" end="31"/>
+  </flags>
+  <reg name="sr" bitsize="32" type="sr_flags"/>
+</feature>
diff --git a/gdb/features/or1k.c b/gdb/features/or1k.c
new file mode 100644
index 00000000000..929a5f92089
--- /dev/null
+++ b/gdb/features/or1k.c
@@ -0,0 +1,77 @@
+/* THIS FILE IS GENERATED.  -*- buffer-read-only: t -*- vi:set ro:
+  Original: or1k.xml */
+
+#include "defs.h"
+#include "osabi.h"
+#include "target-descriptions.h"
+
+struct target_desc *tdesc_or1k;
+static void
+initialize_tdesc_or1k (void)
+{
+  struct target_desc *result = allocate_target_description ();
+  set_tdesc_architecture (result, bfd_scan_arch ("or1k"));
+
+  struct tdesc_feature *feature;
+
+  feature = tdesc_create_feature (result, "org.gnu.gdb.or1k.group0");
+  tdesc_type_with_fields *type_with_fields;
+  tdesc_type *field_type;
+  type_with_fields = tdesc_create_flags (feature, "sr_flags", 4);
+  tdesc_add_flag (type_with_fields, 0, "SM");
+  tdesc_add_flag (type_with_fields, 1, "TEE");
+  tdesc_add_flag (type_with_fields, 2, "IEE");
+  tdesc_add_flag (type_with_fields, 3, "DCE");
+  tdesc_add_flag (type_with_fields, 4, "ICE");
+  tdesc_add_flag (type_with_fields, 5, "DME");
+  tdesc_add_flag (type_with_fields, 6, "IME");
+  tdesc_add_flag (type_with_fields, 7, "LEE");
+  tdesc_add_flag (type_with_fields, 8, "CE");
+  tdesc_add_flag (type_with_fields, 9, "F");
+  tdesc_add_flag (type_with_fields, 10, "CY");
+  tdesc_add_flag (type_with_fields, 11, "OV");
+  tdesc_add_flag (type_with_fields, 12, "OVE");
+  tdesc_add_flag (type_with_fields, 13, "DSX");
+  tdesc_add_flag (type_with_fields, 14, "EPH");
+  tdesc_add_flag (type_with_fields, 15, "FO");
+  tdesc_add_flag (type_with_fields, 16, "SUMRA");
+  tdesc_add_bitfield (type_with_fields, "CID", 28, 31);
+
+  tdesc_create_reg (feature, "r0", 0, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r1", 1, 1, NULL, 32, "data_ptr");
+  tdesc_create_reg (feature, "r2", 2, 1, NULL, 32, "data_ptr");
+  tdesc_create_reg (feature, "r3", 3, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r4", 4, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r5", 5, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r6", 6, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r7", 7, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r8", 8, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r9", 9, 1, NULL, 32, "code_ptr");
+  tdesc_create_reg (feature, "r10", 10, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r11", 11, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r12", 12, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r13", 13, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r14", 14, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r15", 15, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r16", 16, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r17", 17, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r18", 18, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r19", 19, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r20", 20, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r21", 21, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r22", 22, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r23", 23, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r24", 24, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r25", 25, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r26", 26, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r27", 27, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r28", 28, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r29", 29, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r30", 30, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "r31", 31, 1, NULL, 32, "int");
+  tdesc_create_reg (feature, "ppc", 32, 1, NULL, 32, "code_ptr");
+  tdesc_create_reg (feature, "npc", 33, 1, NULL, 32, "code_ptr");
+  tdesc_create_reg (feature, "sr", 34, 1, NULL, 32, "sr_flags");
+
+  tdesc_or1k = result;
+}
diff --git a/gdb/features/or1k.xml b/gdb/features/or1k.xml
new file mode 100644
index 00000000000..c138a02e6b4
--- /dev/null
+++ b/gdb/features/or1k.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2016 Free Software Foundation, Inc.
+
+     Copying and distribution of this file, with or without modification,
+     are permitted in any medium without royalty provided the copyright
+     notice and this notice are preserved.  -->
+
+<!DOCTYPE target SYSTEM "gdb-target.dtd">
+<target>
+  <architecture>or1k</architecture>
+  <xi:include href="or1k-core.xml"/>
+</target>