Rename 32- and 64-bit Intel files from "i386" to "x86"

This commit renames nine files that contain code used by both 32- and
64-bit Intel ports such that their names are prefixed with "x86"
rather than "i386".  All types, functions and variables within these
files are likewise renamed such that their names are prefixed with
"x86" rather than "i386".  This makes GDB follow the convention used
by gdbserver such that 32-bit Intel code lives in files called
"i386-*", 64-bit Intel code lives in files called "amd64-*", and code
for both 32- and 64-bit Intel lives in files called "x86-*".

This commit only renames OS-independent files.  The Linux ports of
both GDB and gdbserver now follow the i386/amd64/x86 convention fully.
Some ports still use the old convention where "i386" in file/function/
type/variable names can mean "32-bit only" or "32- and 64-bit" but I
don't want to touch ports I can't fully test except where absolutely
necessary.

gdb/ChangeLog:

	* i386-nat.h: Renamed as...
	* x86-nat.h: New file.  All type, function and variable name
	prefixes changed from "i386_" to "x86_".  All references updated.
	* i386-nat.c: Renamed as...
	* x86-nat.c: New file.  All type, function and variable name
	prefixes changed from "i386_" to "x86_".  All references updated.
	* common/i386-xstate.h: Renamed as...
	* common/x86-xstate.h: New file.  All type, function and variable
	name prefixes changed from "i386_" to "x86_".  All references
	updated.
	* nat/i386-cpuid.h: Renamed as...
	* nat/x86-cpuid.h: New file.  All type, function and variable name
	prefixes changed from "i386_" to "x86_".  All references updated.
	* nat/i386-gcc-cpuid.h: Renamed as...
	* nat/x86-gcc-cpuid.h: New file.  All type, function and variable
	name prefixes changed from "i386_" to "x86_".  All references
	updated.
	* nat/i386-dregs.h: Renamed as...
	* nat/x86-dregs.h: New file.  All type, function and variable name
	prefixes changed from "i386_" to "x86_".  All references updated.
	* nat/i386-dregs.c: Renamed as...
	* nat/x86-dregs.c: New file.  All type, function and variable name
	prefixes changed from "i386_" to "x86_".  All references updated.

gdb/gdbserver/ChangeLog:

	* i386-low.h: Renamed as...
	* x86-low.h: New file.  All type, function and variable name
	prefixes changed from "i386_" to "x86_".  All references updated.
	* i386-low.c: Renamed as...
	* x86-low.c: New file.  All type, function and variable name
	prefixes changed from "i386_" to "x86_".  All references updated.

1 files changed, 316 insertions, 0 deletions

diff --git a/gdb/x86-nat.c b/gdb/x86-nat.c
new file mode 100644
index 0000000..6a0ca4b
--- /dev/null
+++ b/gdb/x86-nat.c
@@ -0,0 +1,316 @@
+/* Native-dependent code for x86 (i386 and x86-64).
+
+   Copyright (C) 2001-2014 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 "x86-nat.h"
+#include "gdbcmd.h"
+#include "inferior.h"
+
+/* Support for hardware watchpoints and breakpoints using the x86
+   debug registers.
+
+   This provides several functions for inserting and removing
+   hardware-assisted breakpoints and watchpoints, testing if one or
+   more of the watchpoints triggered and at what address, checking
+   whether a given region can be watched, etc.
+
+   The functions below implement debug registers sharing by reference
+   counts, and allow to watch regions up to 16 bytes long.  */
+
+/* Whether or not to print the mirrored debug registers.  */
+int debug_hw_points;
+
+/* Low-level function vector.  */
+struct x86_dr_low_type x86_dr_low;
+
+/* Per-process data.  We don't bind this to a per-inferior registry
+   because of targets like x86 GNU/Linux that need to keep track of
+   processes that aren't bound to any inferior (e.g., fork children,
+   checkpoints).  */
+
+struct x86_process_info
+{
+  /* Linked list.  */
+  struct x86_process_info *next;
+
+  /* The process identifier.  */
+  pid_t pid;
+
+  /* Copy of x86 hardware debug registers.  */
+  struct x86_debug_reg_state state;
+};
+
+static struct x86_process_info *x86_process_list = NULL;
+
+/* Find process data for process PID.  */
+
+static struct x86_process_info *
+x86_find_process_pid (pid_t pid)
+{
+  struct x86_process_info *proc;
+
+  for (proc = x86_process_list; proc; proc = proc->next)
+    if (proc->pid == pid)
+      return proc;
+
+  return NULL;
+}
+
+/* Add process data for process PID.  Returns newly allocated info
+   object.  */
+
+static struct x86_process_info *
+x86_add_process (pid_t pid)
+{
+  struct x86_process_info *proc;
+
+  proc = xcalloc (1, sizeof (*proc));
+  proc->pid = pid;
+
+  proc->next = x86_process_list;
+  x86_process_list = proc;
+
+  return proc;
+}
+
+/* Get data specific info for process PID, creating it if necessary.
+   Never returns NULL.  */
+
+static struct x86_process_info *
+x86_process_info_get (pid_t pid)
+{
+  struct x86_process_info *proc;
+
+  proc = x86_find_process_pid (pid);
+  if (proc == NULL)
+    proc = x86_add_process (pid);
+
+  return proc;
+}
+
+/* Get debug registers state for process PID.  */
+
+struct x86_debug_reg_state *
+x86_debug_reg_state (pid_t pid)
+{
+  return &x86_process_info_get (pid)->state;
+}
+
+/* See declaration in i386-nat.h.  */
+
+void
+x86_forget_process (pid_t pid)
+{
+  struct x86_process_info *proc, **proc_link;
+
+  proc = x86_process_list;
+  proc_link = &x86_process_list;
+
+  while (proc != NULL)
+    {
+      if (proc->pid == pid)
+	{
+	  *proc_link = proc->next;
+
+	  xfree (proc);
+	  return;
+	}
+
+      proc_link = &proc->next;
+      proc = *proc_link;
+    }
+}
+
+/* Clear the reference counts and forget everything we knew about the
+   debug registers.  */
+
+void
+x86_cleanup_dregs (void)
+{
+  /* Starting from scratch has the same effect.  */
+  x86_forget_process (ptid_get_pid (inferior_ptid));
+}
+
+/* Insert a watchpoint to watch a memory region which starts at
+   address ADDR and whose length is LEN bytes.  Watch memory accesses
+   of the type TYPE.  Return 0 on success, -1 on failure.  */
+
+static int
+x86_insert_watchpoint (struct target_ops *self,
+		       CORE_ADDR addr, int len, int type,
+		       struct expression *cond)
+{
+  struct x86_debug_reg_state *state
+    = x86_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+  return x86_dr_insert_watchpoint (state, type, addr, len);
+}
+
+/* Remove a watchpoint that watched the memory region which starts at
+   address ADDR, whose length is LEN bytes, and for accesses of the
+   type TYPE.  Return 0 on success, -1 on failure.  */
+static int
+x86_remove_watchpoint (struct target_ops *self,
+		       CORE_ADDR addr, int len, int type,
+		       struct expression *cond)
+{
+  struct x86_debug_reg_state *state
+    = x86_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+  return x86_dr_remove_watchpoint (state, type, addr, len);
+}
+
+/* Return non-zero if we can watch a memory region that starts at
+   address ADDR and whose length is LEN bytes.  */
+
+static int
+x86_region_ok_for_watchpoint (struct target_ops *self,
+			      CORE_ADDR addr, int len)
+{
+  struct x86_debug_reg_state *state
+    = x86_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+  return x86_dr_region_ok_for_watchpoint (state, addr, len);
+}
+
+/* If the inferior has some break/watchpoint that triggered, set the
+   address associated with that break/watchpoint and return non-zero.
+   Otherwise, return zero.  */
+
+static int
+x86_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p)
+{
+  struct x86_debug_reg_state *state
+    = x86_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+  return x86_dr_stopped_data_address (state, addr_p);
+}
+
+/* Return non-zero if the inferior has some watchpoint that triggered.
+   Otherwise return zero.  */
+
+static int
+x86_stopped_by_watchpoint (struct target_ops *ops)
+{
+  struct x86_debug_reg_state *state
+    = x86_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+  return x86_dr_stopped_by_watchpoint (state);
+}
+
+/* Insert a hardware-assisted breakpoint at BP_TGT->placed_address.
+   Return 0 on success, EBUSY on failure.  */
+
+static int
+x86_insert_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch,
+			  struct bp_target_info *bp_tgt)
+{
+  struct x86_debug_reg_state *state
+    = x86_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+  return x86_dr_insert_watchpoint (state, hw_execute,
+				   bp_tgt->placed_address, 1) ? EBUSY : 0;
+}
+
+/* Remove a hardware-assisted breakpoint at BP_TGT->placed_address.
+   Return 0 on success, -1 on failure.  */
+
+static int
+x86_remove_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch,
+			  struct bp_target_info *bp_tgt)
+{
+  struct x86_debug_reg_state *state
+    = x86_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+  return x86_dr_remove_watchpoint (state, hw_execute,
+				   bp_tgt->placed_address, 1);
+}
+
+/* Returns the number of hardware watchpoints of type TYPE that we can
+   set.  Value is positive if we can set CNT watchpoints, zero if
+   setting watchpoints of type TYPE is not supported, and negative if
+   CNT is more than the maximum number of watchpoints of type TYPE
+   that we can support.  TYPE is one of bp_hardware_watchpoint,
+   bp_read_watchpoint, bp_write_watchpoint, or bp_hardware_breakpoint.
+   CNT is the number of such watchpoints used so far (including this
+   one).  OTHERTYPE is non-zero if other types of watchpoints are
+   currently enabled.
+
+   We always return 1 here because we don't have enough information
+   about possible overlap of addresses that they want to watch.  As an
+   extreme example, consider the case where all the watchpoints watch
+   the same address and the same region length: then we can handle a
+   virtually unlimited number of watchpoints, due to debug register
+   sharing implemented via reference counts in i386-nat.c.  */
+
+static int
+x86_can_use_hw_breakpoint (struct target_ops *self,
+			   int type, int cnt, int othertype)
+{
+  return 1;
+}
+
+static void
+add_show_debug_regs_command (void)
+{
+  /* A maintenance command to enable printing the internal DRi mirror
+     variables.  */
+  add_setshow_boolean_cmd ("show-debug-regs", class_maintenance,
+			   &debug_hw_points, _("\
+Set whether to show variables that mirror the x86 debug registers."), _("\
+Show whether to show variables that mirror the x86 debug registers."), _("\
+Use \"on\" to enable, \"off\" to disable.\n\
+If enabled, the debug registers values are shown when GDB inserts\n\
+or removes a hardware breakpoint or watchpoint, and when the inferior\n\
+triggers a breakpoint or watchpoint."),
+			   NULL,
+			   NULL,
+			   &maintenance_set_cmdlist,
+			   &maintenance_show_cmdlist);
+}
+
+/* There are only two global functions left.  */
+
+void
+x86_use_watchpoints (struct target_ops *t)
+{
+  /* After a watchpoint trap, the PC points to the instruction after the
+     one that caused the trap.  Therefore we don't need to step over it.
+     But we do need to reset the status register to avoid another trap.  */
+  t->to_have_continuable_watchpoint = 1;
+
+  t->to_can_use_hw_breakpoint = x86_can_use_hw_breakpoint;
+  t->to_region_ok_for_hw_watchpoint = x86_region_ok_for_watchpoint;
+  t->to_stopped_by_watchpoint = x86_stopped_by_watchpoint;
+  t->to_stopped_data_address = x86_stopped_data_address;
+  t->to_insert_watchpoint = x86_insert_watchpoint;
+  t->to_remove_watchpoint = x86_remove_watchpoint;
+  t->to_insert_hw_breakpoint = x86_insert_hw_breakpoint;
+  t->to_remove_hw_breakpoint = x86_remove_hw_breakpoint;
+}
+
+void
+x86_set_debug_register_length (int len)
+{
+  /* This function should be called only once for each native target.  */
+  gdb_assert (x86_dr_low.debug_register_length == 0);
+  gdb_assert (len == 4 || len == 8);
+  x86_dr_low.debug_register_length = len;
+  add_show_debug_regs_command ();
+}