2008-02-11 Maxim Grigoriev <maxim2405@gmail.com>

	* NEWS (New native configurations): Xtensa GNU/Linux.
	(New targets): Xtensa GNU/Linux.
	* Makefile.in (ALL_TARGET_OBS): Add xtensa-linux-nat.o and
	xtensa-linux-tdep.o
	(ALLDEPFILES): Add xtensa-linux-tdep.c and xtensa-linux-nat.c
	(xtensa-linux-nat.o, xtensa-linux-tdep.o): New dependencies.
	* configure.tgt (xtensa*-*-linux*): New entry.
	* xtensa-config.c (xtensa_tdep): New variable.
	(xtensa_config_byte_order, xtensa_config_tdep): Removed.
	(rmap): Change format based on new macro XTREG.
	(XTENSA_CONFIG_INSTANTIATE): Use new macro defined in xtensa-tdep.h.
	* xtensa-linux-nat.c: New.
	* xtensa-linux-tdep.c: New.
	* xtensa-xtregs.c: New.
	* xtensa-tdep.h (xtensa_elf_gregset_t): Update.
	(XTENSA_ELF_NGREG, XTREG, XTREG_END, XTENSA_GDBARCH_TDEP_INSTANTIATE)
	(XCHAL_NUM_CONTEXTS, XCHAL_HAVE_EXCEPTIONS): New macros.
	(xtensa_register_t): New field coprocessor.
	(XTENSA_REGISTER_FLAGS_PRIVILEGED): Name spelling corrected.
	* xtensa-tdep.c (xtensa_config_tdep, xtensa_config_byte_order): Removed.
	(xtensa_pseudo_register_read, xtensa_pseudo_register_write):
	Update to handle privileged registers.
	(xtensa_supply_gregset) Remove exccause and excvaddr registers.
	(xtensa_push_dummy_call): Set windowstart register correctly.
	(call0_analyze_prologue): Initialize xtensa_default_isa.
	(xtensa_derive_tdep): New.
	(xtensa_gdbarch_init): Get rid of xtensa_config_byte_order and
	xtensa_config_tdep, use XCHAL_HAVE_BE and xtensa_tdep instead.
	Call xtensa_derive_tdep().
	* config/xtensa/linux.mh: New.
	* regformats/reg-xtensa.dat: New.

1 files changed, 322 insertions, 0 deletions

diff --git a/gdb/xtensa-linux-nat.c b/gdb/xtensa-linux-nat.c
new file mode 100644
index 0000000..5d27173
--- /dev/null
+++ b/gdb/xtensa-linux-nat.c
@@ -0,0 +1,322 @@
+/* Xtensa GNU/Linux native support.
+
+   Copyright (C) 2007, 2008 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 "gdb_string.h"
+#include "frame.h"
+#include "inferior.h"
+#include "gdbcore.h"
+#include "regcache.h"
+#include "gdb_assert.h"
+#include "target.h"
+#include "linux-nat.h"
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <signal.h>
+#include <sys/user.h>
+#include <sys/ioctl.h>
+#include "gdb_wait.h"
+#include <fcntl.h>
+#include <sys/procfs.h>
+#include <sys/ptrace.h>
+
+#include "gregset.h"
+#include "xtensa-tdep.h"
+
+/* Extended register set depends on hardware configs.
+   Keeping these definitions separately allows to introduce
+   hardware-specific overlays.  */
+#include "xtensa-xtregs.c"
+
+int
+get_thread_id (ptid_t ptid)
+{
+  int tid = TIDGET (ptid);
+  if (0 == tid)
+    tid = PIDGET (ptid);
+  return tid;
+}
+#define GET_THREAD_ID(PTID)	get_thread_id (PTID)
+
+void
+fill_gregset (const struct regcache *regcache,
+	      gdb_gregset_t *gregsetp, int regnum)
+{
+  int i;
+  xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+
+  if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
+    regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
+  if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
+    regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
+
+  if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
+    regcache_raw_collect (regcache,
+			  gdbarch_tdep (gdbarch)->wb_regnum,
+			  &regs->windowbase);
+  if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
+    regcache_raw_collect (regcache,
+			  gdbarch_tdep (gdbarch)->ws_regnum,
+			  &regs->windowstart);
+  if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
+    regcache_raw_collect (regcache,
+			  gdbarch_tdep (gdbarch)->lbeg_regnum,
+			  &regs->lbeg);
+  if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
+    regcache_raw_collect (regcache,
+			  gdbarch_tdep (gdbarch)->lend_regnum,
+			  &regs->lend);
+  if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
+    regcache_raw_collect (regcache,
+			  gdbarch_tdep (gdbarch)->lcount_regnum,
+			  &regs->lcount);
+  if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
+    regcache_raw_collect (regcache,
+			  gdbarch_tdep (gdbarch)->sar_regnum,
+			  &regs->sar);
+  if (regnum >=gdbarch_tdep (gdbarch)->ar_base
+      && regnum < gdbarch_tdep (gdbarch)->ar_base
+		    + gdbarch_tdep (gdbarch)->num_aregs)
+    regcache_raw_collect (regcache,regnum,
+			  &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
+  else if (regnum == -1)
+    {
+      for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
+	regcache_raw_collect (regcache,
+			      gdbarch_tdep (gdbarch)->ar_base + i,
+			      &regs->ar[i]);
+    }
+}
+
+void
+supply_gregset_reg (struct regcache *regcache,
+		    const gdb_gregset_t *gregsetp, int regnum)
+{
+  int i;
+  xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
+
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+
+  if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
+    regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
+  if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
+    regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
+
+  if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
+    regcache_raw_supply (regcache,
+			  gdbarch_tdep (gdbarch)->wb_regnum,
+			  &regs->windowbase);
+  if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
+    regcache_raw_supply (regcache,
+			  gdbarch_tdep (gdbarch)->ws_regnum,
+			  &regs->windowstart);
+  if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
+    regcache_raw_supply (regcache,
+			  gdbarch_tdep (gdbarch)->lbeg_regnum,
+			  &regs->lbeg);
+  if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
+    regcache_raw_supply (regcache,
+			  gdbarch_tdep (gdbarch)->lend_regnum,
+			  &regs->lend);
+  if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
+    regcache_raw_supply (regcache,
+			  gdbarch_tdep (gdbarch)->lcount_regnum,
+			  &regs->lcount);
+  if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
+    regcache_raw_supply (regcache,
+			  gdbarch_tdep (gdbarch)->sar_regnum,
+			  &regs->sar);
+  if (regnum >=gdbarch_tdep (gdbarch)->ar_base
+      && regnum < gdbarch_tdep (gdbarch)->ar_base
+		    + gdbarch_tdep (gdbarch)->num_aregs)
+    regcache_raw_supply (regcache,regnum,
+			  &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
+  else if (regnum == -1)
+    {
+      for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
+	regcache_raw_supply (regcache,
+			      gdbarch_tdep (gdbarch)->ar_base + i,
+			      &regs->ar[i]);
+    }
+}
+
+void
+supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
+{
+  supply_gregset_reg (regcache, gregsetp, -1);
+}
+
+void
+fill_fpregset (const struct regcache *regcache,
+	       gdb_fpregset_t *fpregsetp, int regnum)
+{
+  return;
+}
+
+void 
+supply_fpregset (struct regcache *regcache,
+		 const gdb_fpregset_t *fpregsetp)
+{
+  return;
+}
+
+/* Fetch greg-register(s) from process/thread TID
+   and store value(s) in GDB's register array.  */
+
+static void
+fetch_gregs (struct regcache *regcache, int regnum)
+{
+  int tid = GET_THREAD_ID (inferior_ptid);
+  const gdb_gregset_t regs;
+  int areg;
+  
+  if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
+    {
+      perror_with_name (_("Couldn't get registers"));
+      return;
+    }
+ 
+  supply_gregset_reg (regcache, &regs, regnum);
+}
+
+/* Store greg-register(s) in GDB's register 
+   array into the process/thread specified by TID.  */
+
+static void
+store_gregs (struct regcache *regcache, int regnum)
+{
+  int tid = GET_THREAD_ID (inferior_ptid);
+  gdb_gregset_t regs;
+  int areg;
+
+  if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
+    {
+      perror_with_name (_("Couldn't get registers"));
+      return;
+    }
+
+  fill_gregset (regcache, &regs, regnum);
+
+  if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
+    {
+      perror_with_name (_("Couldn't write registers"));
+      return;
+    }
+}
+
+static int xtreg_lo;
+static int xtreg_high;
+
+/* Fetch/Store Xtensa TIE registers.  Xtensa GNU/Linux PTRACE
+   interface provides special requests for this.  */
+
+static void
+fetch_xtregs (struct regcache *regcache, int regnum)
+{
+  int tid = GET_THREAD_ID (inferior_ptid);
+  const xtensa_regtable_t *ptr;
+  char xtregs [XTENSA_ELF_XTREG_SIZE];
+
+  if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
+    perror_with_name (_("Couldn't get extended registers"));
+
+  for (ptr = xtensa_regmap_table; ptr->name; ptr++)
+    if (regnum == ptr->gdb_regnum || regnum == -1)
+      regcache_raw_supply (regcache, ptr->gdb_regnum,
+			   xtregs + ptr->ptrace_offset);
+}
+
+static void
+store_xtregs (struct regcache *regcache, int regnum)
+{
+  int tid = GET_THREAD_ID (inferior_ptid);
+  const xtensa_regtable_t *ptr;
+  char xtregs [XTENSA_ELF_XTREG_SIZE];
+
+  if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
+    perror_with_name (_("Couldn't get extended registers"));
+
+  for (ptr = xtensa_regmap_table; ptr->name; ptr++)
+    if (regnum == ptr->gdb_regnum || regnum == -1)
+      regcache_raw_collect (regcache, ptr->gdb_regnum,
+			    xtregs + ptr->ptrace_offset);
+
+  if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
+    perror_with_name (_("Couldn't write extended registers"));
+}
+
+void
+xtensa_linux_fetch_inferior_registers (struct regcache *regcache, int regnum)
+{
+  if (regnum == -1)
+    {
+      fetch_gregs (regcache, regnum);
+      fetch_xtregs (regcache, regnum);
+    }
+  else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
+    fetch_gregs (regcache, regnum);
+  else
+    fetch_xtregs (regcache, regnum);
+}
+
+void
+xtensa_linux_store_inferior_registers (struct regcache *regcache, int regnum)
+{
+  if (regnum == -1)
+    {
+      store_gregs (regcache, regnum);
+      store_xtregs (regcache, regnum);
+    }
+  else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
+    store_gregs (regcache, regnum);
+  else
+    store_xtregs (regcache, regnum);
+}
+
+void _initialize_xtensa_linux_nat (void);
+
+void
+_initialize_xtensa_linux_nat (void)
+{
+  struct target_ops *t;
+  const xtensa_regtable_t *ptr;
+
+  /* Calculate the number range for extended registers.  */
+  xtreg_lo = 1000000000;
+  xtreg_high = -1;
+  for (ptr = xtensa_regmap_table; ptr->name; ptr++)
+    {
+      if (ptr->gdb_regnum < xtreg_lo)
+	xtreg_lo = ptr->gdb_regnum;
+      if (ptr->gdb_regnum > xtreg_high)
+	xtreg_high = ptr->gdb_regnum;
+    }
+
+  /* Fill in the generic GNU/Linux methods.  */
+  t = linux_target ();
+
+  /* Add our register access methods.  */
+  t->to_fetch_registers = xtensa_linux_fetch_inferior_registers;
+  t->to_store_registers = xtensa_linux_store_inferior_registers;
+
+  linux_nat_add_target (t);
+}