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, 209 insertions, 0 deletions

diff --git a/gdbserver/linux-aarch64-ipa.cc b/gdbserver/linux-aarch64-ipa.cc
new file mode 100644
index 0000000..694dfd7
--- /dev/null
+++ b/gdbserver/linux-aarch64-ipa.cc
@@ -0,0 +1,209 @@
+/* GNU/Linux/AArch64 specific low level interface, for the in-process
+   agent library for GDB.
+
+   Copyright (C) 2015-2020 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 <sys/mman.h>
+#include "tracepoint.h"
+#include <elf.h>
+#ifdef HAVE_GETAUXVAL
+#include <sys/auxv.h>
+#endif
+#include "linux-aarch64-tdesc.h"
+
+/* Each register saved by the jump pad is in a 16 byte cell.  */
+#define FT_CR_SIZE 16
+
+#define FT_CR_FPCR	0
+#define FT_CR_FPSR	1
+#define FT_CR_CPSR	2
+#define FT_CR_PC	3
+#define FT_CR_SP	4
+#define FT_CR_X0	5
+#define FT_CR_GPR(n)	(FT_CR_X0 + (n))
+#define FT_CR_FPR(n)	(FT_CR_GPR (31) + (n))
+
+/* Mapping between registers collected by the jump pad and GDB's register
+   array layout used by regcache.
+
+   See linux-aarch64-low.c (aarch64_install_fast_tracepoint_jump_pad) for
+   more details.  */
+
+static const int aarch64_ft_collect_regmap[] = {
+  FT_CR_GPR (0),
+  FT_CR_GPR (1),
+  FT_CR_GPR (2),
+  FT_CR_GPR (3),
+  FT_CR_GPR (4),
+  FT_CR_GPR (5),
+  FT_CR_GPR (6),
+  FT_CR_GPR (7),
+  FT_CR_GPR (8),
+  FT_CR_GPR (9),
+  FT_CR_GPR (10),
+  FT_CR_GPR (11),
+  FT_CR_GPR (12),
+  FT_CR_GPR (13),
+  FT_CR_GPR (14),
+  FT_CR_GPR (15),
+  FT_CR_GPR (16),
+  FT_CR_GPR (17),
+  FT_CR_GPR (18),
+  FT_CR_GPR (19),
+  FT_CR_GPR (20),
+  FT_CR_GPR (21),
+  FT_CR_GPR (22),
+  FT_CR_GPR (23),
+  FT_CR_GPR (24),
+  FT_CR_GPR (25),
+  FT_CR_GPR (26),
+  FT_CR_GPR (27),
+  FT_CR_GPR (28),
+  /* FP */
+  FT_CR_GPR (29),
+  /* LR */
+  FT_CR_GPR (30),
+  FT_CR_SP,
+  FT_CR_PC,
+  FT_CR_CPSR,
+  FT_CR_FPR (0),
+  FT_CR_FPR (1),
+  FT_CR_FPR (2),
+  FT_CR_FPR (3),
+  FT_CR_FPR (4),
+  FT_CR_FPR (5),
+  FT_CR_FPR (6),
+  FT_CR_FPR (7),
+  FT_CR_FPR (8),
+  FT_CR_FPR (9),
+  FT_CR_FPR (10),
+  FT_CR_FPR (11),
+  FT_CR_FPR (12),
+  FT_CR_FPR (13),
+  FT_CR_FPR (14),
+  FT_CR_FPR (15),
+  FT_CR_FPR (16),
+  FT_CR_FPR (17),
+  FT_CR_FPR (18),
+  FT_CR_FPR (19),
+  FT_CR_FPR (20),
+  FT_CR_FPR (21),
+  FT_CR_FPR (22),
+  FT_CR_FPR (23),
+  FT_CR_FPR (24),
+  FT_CR_FPR (25),
+  FT_CR_FPR (26),
+  FT_CR_FPR (27),
+  FT_CR_FPR (28),
+  FT_CR_FPR (29),
+  FT_CR_FPR (30),
+  FT_CR_FPR (31),
+  FT_CR_FPSR,
+  FT_CR_FPCR
+};
+
+#define AARCH64_NUM_FT_COLLECT_GREGS \
+  (sizeof (aarch64_ft_collect_regmap) / sizeof(aarch64_ft_collect_regmap[0]))
+
+/* Fill in REGCACHE with registers saved by the jump pad in BUF.  */
+
+void
+supply_fast_tracepoint_registers (struct regcache *regcache,
+				  const unsigned char *buf)
+{
+  int i;
+
+  for (i = 0; i < AARCH64_NUM_FT_COLLECT_GREGS; i++)
+    supply_register (regcache, i,
+		     ((char *) buf)
+		     + (aarch64_ft_collect_regmap[i] * FT_CR_SIZE));
+}
+
+ULONGEST
+get_raw_reg (const unsigned char *raw_regs, int regnum)
+{
+  if (regnum >= AARCH64_NUM_FT_COLLECT_GREGS)
+    return 0;
+
+  return *(ULONGEST *) (raw_regs
+			+ aarch64_ft_collect_regmap[regnum] * FT_CR_SIZE);
+}
+
+/* Return target_desc to use for IPA, given the tdesc index passed by
+   gdbserver.  Index is ignored, since we have only one tdesc
+   at the moment.  SVE and pauth not yet supported.  */
+
+const struct target_desc *
+get_ipa_tdesc (int idx)
+{
+  return aarch64_linux_read_description (0, false);
+}
+
+/* Allocate buffer for the jump pads.  The branch instruction has a reach
+   of +/- 128MiB, and the executable is loaded at 0x400000 (4MiB).
+   To maximize the area of executable that can use tracepoints, try
+   allocating at 0x400000 - size initially, decreasing until we hit
+   a free area.  */
+
+void *
+alloc_jump_pad_buffer (size_t size)
+{
+  uintptr_t addr;
+  uintptr_t exec_base = getauxval (AT_PHDR);
+  int pagesize;
+  void *res;
+
+  if (exec_base == 0)
+    exec_base = 0x400000;
+
+  pagesize = sysconf (_SC_PAGE_SIZE);
+  if (pagesize == -1)
+    perror_with_name ("sysconf");
+
+  addr = exec_base - size;
+
+  /* size should already be page-aligned, but this can't hurt.  */
+  addr &= ~(pagesize - 1);
+
+  /* Search for a free area.  If we hit 0, we're out of luck.  */
+  for (; addr; addr -= pagesize)
+    {
+      /* No MAP_FIXED - we don't want to zap someone's mapping.  */
+      res = mmap ((void *) addr, size,
+		  PROT_READ | PROT_WRITE | PROT_EXEC,
+		  MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+      /* If we got what we wanted, return.  */
+      if ((uintptr_t) res == addr)
+	return res;
+
+      /* If we got a mapping, but at a wrong address, undo it.  */
+      if (res != MAP_FAILED)
+	munmap (res, size);
+    }
+
+  return NULL;
+}
+
+void
+initialize_low_tracepoint (void)
+{
+  /* SVE and pauth not yet supported.  */
+  aarch64_linux_read_description (0, false);
+}