gdbserver: rename source files to .cc

For the same reasons outlined in the previous patch, this patch renames
gdbserver source files to .cc.

I have moved the "-x c++" switch to only those rules that require it.

gdbserver/ChangeLog:

	* Makefile.in: Rename source files from .c to .cc.
	* %.c: Rename to %.cc.
	* configure.ac: Rename server.c to server.cc.
	* configure: Re-generate.

1 files changed, 259 insertions, 0 deletions

diff --git a/gdbserver/linux-nios2-low.cc b/gdbserver/linux-nios2-low.cc
new file mode 100644
index 0000000..bfc5aee
--- /dev/null
+++ b/gdbserver/linux-nios2-low.cc
@@ -0,0 +1,259 @@
+/* GNU/Linux/Nios II specific low level interface, for the remote server for
+   GDB.
+   Copyright (C) 2008-2020 Free Software Foundation, Inc.
+
+   Contributed by Mentor Graphics, 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 "linux-low.h"
+#include "elf/common.h"
+#include "nat/gdb_ptrace.h"
+#include <endian.h>
+#include "gdb_proc_service.h"
+#include <asm/ptrace.h>
+
+#ifndef PTRACE_GET_THREAD_AREA
+#define PTRACE_GET_THREAD_AREA 25
+#endif
+
+/* The following definition must agree with the number of registers
+   defined in "struct user_regs" in GLIBC
+   (sysdeps/unix/sysv/linux/nios2/sys/user.h), and also with
+   NIOS2_NUM_REGS in GDB proper.  */
+
+#define nios2_num_regs 49
+
+/* Defined in auto-generated file nios2-linux.c.  */
+
+void init_registers_nios2_linux (void);
+extern const struct target_desc *tdesc_nios2_linux;
+
+/* This union is used to convert between int and byte buffer
+   representations of register contents.  */
+
+union nios2_register
+{
+  unsigned char buf[4];
+  int reg32;
+};
+
+/* Return the ptrace ``address'' of register REGNO. */
+
+static int nios2_regmap[] = {
+  -1,  1,  2,  3,  4,  5,  6,  7,
+  8,  9,  10, 11, 12, 13, 14, 15,
+  16, 17, 18, 19, 20, 21, 22, 23,
+  24, 25, 26, 27, 28, 29, 30, 31,
+  32, 33, 34, 35, 36, 37, 38, 39,
+  40, 41, 42, 43, 44, 45, 46, 47,
+  48,
+  0
+};
+
+/* Implement the arch_setup linux_target_ops method.  */
+
+static void
+nios2_arch_setup (void)
+{
+  current_process ()->tdesc = tdesc_nios2_linux;
+}
+
+/* Implement the cannot_fetch_register linux_target_ops method.  */
+
+static int
+nios2_cannot_fetch_register (int regno)
+{
+  if (nios2_regmap[regno] == -1)
+    return 1;
+
+  return 0;
+}
+
+/* Implement the cannot_store_register linux_target_ops method.  */
+
+static int
+nios2_cannot_store_register (int regno)
+{
+  if (nios2_regmap[regno] == -1)
+    return 1;
+
+  return 0;
+}
+
+/* Breakpoint support.  Also see comments on nios2_breakpoint_from_pc
+   in nios2-tdep.c.  */
+
+#if defined(__nios2_arch__) && __nios2_arch__ == 2
+#define NIOS2_BREAKPOINT 0xb7fd0020
+#define CDX_BREAKPOINT 0xd7c9
+#else
+#define NIOS2_BREAKPOINT 0x003b6ffa
+#endif
+
+/* We only register the 4-byte breakpoint, even on R2 targets which also
+   support 2-byte breakpoints.  Since there is no supports_z_point_type
+   function provided, gdbserver never inserts software breakpoints itself
+   and instead relies on GDB to insert the breakpoint of the correct length
+   via a memory write.  */
+static const unsigned int nios2_breakpoint = NIOS2_BREAKPOINT;
+#define nios2_breakpoint_len 4
+
+/* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
+
+static const gdb_byte *
+nios2_sw_breakpoint_from_kind (int kind, int *size)
+{
+  *size = nios2_breakpoint_len;
+  return (const gdb_byte *) &nios2_breakpoint;
+}
+
+/* Implement the breakpoint_at linux_target_ops method.  */
+
+static int
+nios2_breakpoint_at (CORE_ADDR where)
+{
+  unsigned int insn;
+
+  /* For R2, first check for the 2-byte CDX trap.n breakpoint encoding.  */
+#if defined(__nios2_arch__) && __nios2_arch__ == 2
+  (*the_target->read_memory) (where, (unsigned char *) &insn, 2);
+  if (insn == CDX_BREAKPOINT)
+    return 1;
+#endif
+
+  (*the_target->read_memory) (where, (unsigned char *) &insn, 4);
+  if (insn == nios2_breakpoint)
+    return 1;
+  return 0;
+}
+
+/* Fetch the thread-local storage pointer for libthread_db.  */
+
+ps_err_e
+ps_get_thread_area (struct ps_prochandle *ph,
+                    lwpid_t lwpid, int idx, void **base)
+{
+  if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
+    return PS_ERR;
+
+  /* IDX is the bias from the thread pointer to the beginning of the
+     thread descriptor.  It has to be subtracted due to implementation
+     quirks in libthread_db.  */
+  *base = (void *) ((char *) *base - idx);
+
+  return PS_OK;
+}
+
+/* Helper functions to collect/supply a single register REGNO.  */
+
+static void
+nios2_collect_register (struct regcache *regcache, int regno,
+			union nios2_register *reg)
+{
+  union nios2_register tmp_reg;
+
+  collect_register (regcache, regno, &tmp_reg.reg32);
+  reg->reg32 = tmp_reg.reg32;
+}
+
+static void
+nios2_supply_register (struct regcache *regcache, int regno,
+		       const union nios2_register *reg)
+{
+  supply_register (regcache, regno, reg->buf);
+}
+
+/* We have only a single register set on Nios II.  */
+
+static void
+nios2_fill_gregset (struct regcache *regcache, void *buf)
+{
+  union nios2_register *regset = (union nios2_register *) buf;
+  int i;
+
+  for (i = 1; i < nios2_num_regs; i++)
+    nios2_collect_register (regcache, i, regset + i);
+}
+
+static void
+nios2_store_gregset (struct regcache *regcache, const void *buf)
+{
+  const union nios2_register *regset = (union nios2_register *) buf;
+  int i;
+
+  for (i = 0; i < nios2_num_regs; i++)
+    nios2_supply_register (regcache, i, regset + i);
+}
+
+static struct regset_info nios2_regsets[] =
+{
+  { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS,
+    nios2_num_regs * 4, GENERAL_REGS,
+    nios2_fill_gregset, nios2_store_gregset },
+  NULL_REGSET
+};
+
+static struct regsets_info nios2_regsets_info =
+  {
+    nios2_regsets, /* regsets */
+    0, /* num_regsets */
+    NULL, /* disabled_regsets */
+  };
+
+static struct usrregs_info nios2_usrregs_info =
+  {
+    nios2_num_regs,
+    nios2_regmap,
+  };
+
+static struct regs_info regs_info =
+  {
+    NULL, /* regset_bitmap */
+    &nios2_usrregs_info,
+    &nios2_regsets_info
+  };
+
+static const struct regs_info *
+nios2_regs_info (void)
+{
+  return &regs_info;
+}
+
+struct linux_target_ops the_low_target =
+{
+  nios2_arch_setup,
+  nios2_regs_info,
+  nios2_cannot_fetch_register,
+  nios2_cannot_store_register,
+  NULL,
+  linux_get_pc_32bit,
+  linux_set_pc_32bit,
+  NULL, /* breakpoint_kind_from_pc */
+  nios2_sw_breakpoint_from_kind,
+  NULL, /* get_next_pcs */
+  0,
+  nios2_breakpoint_at,
+};
+
+void
+initialize_low_arch (void)
+{
+  init_registers_nios2_linux ();
+
+  initialize_regsets_info (&nios2_regsets_info);
+}