New regs_info for aarch32

This patch adds a new regs_info regs_info_aarch32 for aarch32, which
can be used by both aarch64 and arm backend.

gdb/gdbserver:

2015-08-04  Yao Qi  <yao.qi@linaro.org>

	* configure.srv (srv_tgtobj): Add linux-aarch32-low.o.
	* linux-aarch32-low.c: New file.
	* linux-aarch32-low.h: New file.
	* linux-arm-low.c (arm_fill_gregset): Move it to
	linux-aarch32-low.c.
	(arm_store_gregset): Likewise.
	(arm_fill_vfpregset): Call arm_fill_vfpregset_num
	(arm_store_vfpregset): Caa arm_store_vfpregset_num.
	(arm_arch_setup): Check if PTRACE_GETREGSET works.
	(regs_info): Rename to regs_info_arm.
	(arm_regs_info): Return regs_info_aarch32 if
	have_ptrace_getregset is 1 and target description is
	arm_with_neon or arm_with_vfpv3.
	(initialize_low_arch): Don't call init_registers_arm_with_neon.
	Call initialize_low_arch_aarch32 instead.

1 files changed, 140 insertions, 0 deletions

diff --git a/gdb/gdbserver/linux-aarch32-low.c b/gdb/gdbserver/linux-aarch32-low.c
new file mode 100644
index 0000000..7f3b985
--- /dev/null
+++ b/gdb/gdbserver/linux-aarch32-low.c
@@ -0,0 +1,140 @@
+/* Copyright (C) 1995-2015 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 "arch/arm.h"
+#include "linux-low.h"
+#include "linux-aarch32-low.h"
+
+#include <sys/ptrace.h>
+/* Don't include elf.h if linux/elf.h got included by gdb_proc_service.h.
+   On Bionic elf.h and linux/elf.h have conflicting definitions.  */
+#ifndef ELFMAG0
+#include <elf.h>
+#endif
+
+/* Collect GP registers from REGCACHE to buffer BUF.  */
+
+void
+arm_fill_gregset (struct regcache *regcache, void *buf)
+{
+  int i;
+  uint32_t *regs = buf;
+
+  for (i = ARM_A1_REGNUM; i <= ARM_PC_REGNUM; i++)
+    collect_register (regcache, i, &regs[i]);
+
+  collect_register (regcache, ARM_PS_REGNUM, &regs[16]);
+}
+
+/* Supply GP registers contents, stored in BUF, to REGCACHE.  */
+
+void
+arm_store_gregset (struct regcache *regcache, const void *buf)
+{
+  int i;
+  char zerobuf[8];
+  const uint32_t *regs = buf;
+
+  memset (zerobuf, 0, 8);
+  for (i = ARM_A1_REGNUM; i <= ARM_PC_REGNUM; i++)
+    supply_register (regcache, i, &regs[i]);
+
+  for (; i < ARM_PS_REGNUM; i++)
+    supply_register (regcache, i, zerobuf);
+
+  supply_register (regcache, ARM_PS_REGNUM, &regs[16]);
+}
+
+/* Collect NUM number of VFP registers from REGCACHE to buffer BUF.  */
+
+void
+arm_fill_vfpregset_num (struct regcache *regcache, void *buf, int num)
+{
+  int i, base;
+
+  gdb_assert (num == 16 || num == 32);
+
+  base = find_regno (regcache->tdesc, "d0");
+  for (i = 0; i < num; i++)
+    collect_register (regcache, base + i, (char *) buf + i * 8);
+
+  collect_register_by_name (regcache, "fpscr", (char *) buf + 32 * 8);
+}
+
+/* Supply NUM number of VFP registers contents, stored in BUF, to
+   REGCACHE.  */
+
+void
+arm_store_vfpregset_num (struct regcache *regcache, const void *buf, int num)
+{
+  int i, base;
+
+  gdb_assert (num == 16 || num == 32);
+
+  base = find_regno (regcache->tdesc, "d0");
+  for (i = 0; i < num; i++)
+    supply_register (regcache, base + i, (char *) buf + i * 8);
+
+  supply_register_by_name (regcache, "fpscr", (char *) buf + 32 * 8);
+}
+
+static void
+arm_fill_vfpregset (struct regcache *regcache, void *buf)
+{
+  arm_fill_vfpregset_num (regcache, buf, 32);
+}
+
+static void
+arm_store_vfpregset (struct regcache *regcache, const void *buf)
+{
+  arm_store_vfpregset_num (regcache, buf, 32);
+}
+
+/* Register sets with using PTRACE_GETREGSET.  */
+
+static struct regset_info aarch32_regsets[] = {
+  { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, 18 * 4,
+    GENERAL_REGS,
+    arm_fill_gregset, arm_store_gregset },
+  { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_ARM_VFP, 32 * 8 + 4,
+    EXTENDED_REGS,
+    arm_fill_vfpregset, arm_store_vfpregset },
+  { 0, 0, 0, -1, -1, NULL, NULL }
+};
+
+static struct regsets_info aarch32_regsets_info =
+  {
+    aarch32_regsets, /* regsets */
+    0, /* num_regsets */
+    NULL, /* disabled_regsets */
+  };
+
+struct regs_info regs_info_aarch32 =
+  {
+    NULL, /* regset_bitmap */
+    NULL, /* usrregs */
+    &aarch32_regsets_info
+  };
+
+void
+initialize_low_arch_aarch32 (void)
+{
+  init_registers_arm_with_neon ();
+
+  initialize_regsets_info (&aarch32_regsets_info);
+}