[RFC][PATCH 14/15] gdbserver: Add linux-arm-ipa.c

[henrik dot wallin at windriver dot com]

From: Henrik Wallin <henrik.wallin@windriver.com>

This adds the ipa for arm.

Currently hard-code to "arm_with_neon".
This probably needs to be improved to validate the arm architecture
that actually is running.

The ipa does not support jit compilation of the fast tracepoint expressions.

gdb/gdbserver/ChangeLog:

	* configure.srv : Add IPA for arm
	* Makefile.in : Add IPA for arm
	* linux-arm-ipa.c : New file

Signed-off-by: Henrik Wallin <henrik.wallin@windriver.com>
---
 gdb/gdbserver/Makefile.in     |  6 +++
 gdb/gdbserver/configure.srv   |  1 +
 gdb/gdbserver/linux-arm-ipa.c | 97 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 104 insertions(+)
 create mode 100644 gdb/gdbserver/linux-arm-ipa.c

diff --git a/gdb/gdbserver/Makefile.in b/gdb/gdbserver/Makefile.in
index cd146f4abd20..8b57072b59a1 100644
--- a/gdb/gdbserver/Makefile.in
+++ b/gdb/gdbserver/Makefile.in
@@ -517,6 +517,12 @@ rsp-low-ipa.o: ../common/rsp-low.c
 errors-ipa.o: ../common/errors.c
 	$(IPAGENT_COMPILE) $<
 	$(POSTCOMPILE)
+arm-linux-ipa.o: arm-with-neon.c
+	$(IPAGENT_COMPILE) $<
+	$(POSTCOMPILE)
+linux-arm-ipa.o: linux-arm-ipa.c
+	$(IPAGENT_COMPILE) $<
+	$(POSTCOMPILE)
 
 ax.o: ax.c
 	$(COMPILE) $(WARN_CFLAGS_NO_FORMAT) $<
diff --git a/gdb/gdbserver/configure.srv b/gdb/gdbserver/configure.srv
index f187c9de0e65..93fe855b93d9 100644
--- a/gdb/gdbserver/configure.srv
+++ b/gdb/gdbserver/configure.srv
@@ -81,6 +81,7 @@ case "${target}" in
 			srv_linux_usrregs=yes
 			srv_linux_regsets=yes
 			srv_linux_thread_db=yes
+			ipa_obj="arm-linux-ipa.o linux-arm-ipa.o"
 			;;
   arm*-*-mingw32ce*)	srv_regobj=reg-arm.o
 			srv_tgtobj="win32-low.o win32-arm-low.o"
diff --git a/gdb/gdbserver/linux-arm-ipa.c b/gdb/gdbserver/linux-arm-ipa.c
new file mode 100644
index 000000000000..e14465b94423
--- /dev/null
+++ b/gdb/gdbserver/linux-arm-ipa.c
@@ -0,0 +1,97 @@
+/* GNU/Linux/arm specific low level interface, for the in-process
+   agent library for GDB.
+
+   Copyright (C) 2015 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "server.h"
+#include <stdint.h>
+#include <sys/mman.h>
+#include "tracepoint.h"
+
+/* Defined in auto-generated file regs-arm.c.  */
+void init_registers_arm_with_neon (void);
+extern const struct target_desc *tdesc_arm_with_neon;
+
+/* reg map
+ */
+int index_map[] = {
+  2,				/*  0 - r0 */
+  3,				/*  1 - r1 */
+  4,				/*  2 - r2 */
+  5,				/*  3 - r3 */
+  6,				/*  4 - r4 */
+  7,				/*  5 - r5 */
+  8,				/*  6 - r6 */
+  9,				/*  7 - r7 */
+  10,				/*  8 - r8 */
+  11,				/*  9 - r9 */
+  12,				/* 10 - r10 */
+  13,				/* 11 - r11 */
+  14,				/* 12 - r12 */
+  -1,				/* 13 - r13 - sp */
+  15,				/* 14 - r14 - lr */
+  0,				/* 15 - r15 - pc */
+  -1,				/* 16 - */
+  -1,				/* 17 - */
+  -1,				/* 18 - */
+  -1,				/* 19 - */
+  -1,				/* 20 - */
+  -1,				/* 21 - */
+  -1,				/* 22 - */
+  -1,				/* 23 - */
+  -1,				/* 24 - */
+  1,				/* 25 - cpsr */
+};
+
+void
+supply_fast_tracepoint_registers (struct regcache *regcache,
+				  const unsigned char *buf)
+{
+  const uint32_t *regs = (const uint32_t *) buf;
+  uint32_t val;
+  int i;
+
+  for (i = 0; i < sizeof(index_map) / sizeof(index_map[0]); i++)
+    {
+      int index = index_map[i];
+      if (index != -1)
+	{
+	  val = regs[index];
+	  supply_register (regcache, i, &val);
+	}
+    }
+  /* special for sp   */
+  val = (uint32_t) regs + 16 * 4;
+  supply_register (regcache, 13, &val);
+}
+
+IP_AGENT_EXPORT_FUNC ULONGEST
+gdb_agent_get_raw_reg (const unsigned char *raw_regs, int regnum)
+{
+  /* only for jit  */
+  return 0;
+}
+
+const char *gdbserver_xmltarget;
+
+void
+initialize_low_tracepoint (void)
+{
+  init_registers_arm_with_neon ();
+  ipa_tdesc = tdesc_arm_with_neon;
+}
-- 
2.1.4