New aarch32-linux-nat.c

This patch is to move all the code about transferring
regcache <-> byte buffer for arm (aarch32) to a separate file
aarch32-linux-nat.c.  Then, in the following patch, aarch64 code
can use it to do multi-arch debugging.  This is a refactory patch.

gdb:

2015-07-07  Yao Qi  <yao.qi@linaro.org>

	* aarch32-linux-nat.c: New file.
	* aarch32-linux-nat.h: New file.
	* arm-linux-nat.c: Include aarch32-linux-nat.h.
	(fetch_regs): Move code to aarch32-linux-nat.c.  Call
	aarch32_gp_regcache_supply.
	(store_regs): Move code to aarch32-linux-nat.c.  Call
	aarch32_gp_regcache_collect.
	(fetch_vfp_regs): Move code to aarch32-linux-nat.c.  Call
	aarch32_vfp_regcache_supply.
	(store_vfp_regs): Move code to aarch32-linux-nat.c.  Call
	aarch32_vfp_regcache_collect.
	* config/arm/linux.mh (NATDEPFILES): Add aarch32-linux-nat.o.

1 files changed, 99 insertions, 0 deletions

diff --git a/gdb/aarch32-linux-nat.c b/gdb/aarch32-linux-nat.c
new file mode 100644
index 0000000000..3147399c28
--- /dev/null
+++ b/gdb/aarch32-linux-nat.c
@@ -0,0 +1,99 @@
+/* Copyright (C) 1999-2015 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 "defs.h"
+
+#include "regcache.h"
+#include "arm-tdep.h"
+#include "arm-linux-tdep.h"
+
+#include "aarch32-linux-nat.h"
+
+/* Supply GP registers contents, stored in REGS, to REGCACHE.  ARM_APCS_32
+   is true if the 32-bit mode is in use, otherwise, it is false.  */
+
+void
+aarch32_gp_regcache_supply (struct regcache *regcache, uint32_t *regs,
+			    int arm_apcs_32)
+{
+  int regno;
+
+  for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++)
+    regcache_raw_supply (regcache, regno, &regs[regno]);
+
+  if (arm_apcs_32)
+    regcache_raw_supply (regcache, ARM_PS_REGNUM, &regs[ARM_CPSR_GREGNUM]);
+  else
+    regcache_raw_supply (regcache, ARM_PS_REGNUM, &regs[ARM_PC_REGNUM]);
+
+  regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove
+			  (get_regcache_arch (regcache), regs[ARM_PC_REGNUM]);
+  regcache_raw_supply (regcache, ARM_PC_REGNUM, &regs[ARM_PC_REGNUM]);
+}
+
+/* Collect GP registers from REGCACHE to buffer REGS.  ARM_APCS_32 is
+   true if the 32-bit mode is in use, otherwise, it is false.  */
+
+void
+aarch32_gp_regcache_collect (const struct regcache *regcache, uint32_t *regs,
+			     int arm_apcs_32)
+{
+  int regno;
+
+  for (regno = ARM_A1_REGNUM; regno <= ARM_PC_REGNUM; regno++)
+    {
+      if (REG_VALID == regcache_register_status (regcache, regno))
+	regcache_raw_collect (regcache, regno, &regs[regno]);
+    }
+
+  if (arm_apcs_32
+      && REG_VALID == regcache_register_status (regcache, ARM_PS_REGNUM))
+    regcache_raw_collect (regcache, ARM_PS_REGNUM,
+			  &regs[ARM_CPSR_GREGNUM]);
+}
+
+/* Supply VFP registers contents, stored in REGS, to REGCACHE.
+   VFP_REGISTER_COUNT is the number of VFP registers.  */
+
+void
+aarch32_vfp_regcache_supply (struct regcache *regcache, gdb_byte *regs,
+			     const int vfp_register_count)
+{
+  int regno;
+
+  for (regno = 0; regno < vfp_register_count; regno++)
+    regcache_raw_supply (regcache, regno + ARM_D0_REGNUM,
+			 regs + regno * 8);
+
+  regcache_raw_supply (regcache, ARM_FPSCR_REGNUM,
+		       regs + 32 * 8);
+}
+
+/* Collect VFP registers from REGCACHE to buffer REGS.
+   VFP_REGISTER_COUNT is the number VFP registers.  */
+
+void
+aarch32_vfp_regcache_collect (const struct regcache *regcache, gdb_byte *regs,
+			      const int vfp_register_count)
+{
+  int regno;
+
+  for (regno = 0; regno < vfp_register_count; regno++)
+    regcache_raw_collect (regcache, regno + ARM_D0_REGNUM, regs + regno * 8);
+
+  regcache_raw_collect (regcache, ARM_FPSCR_REGNUM, regs + 32 * 8);
+}