Add support for GNAT Ravenscar run-time library.

gdb/ChangeLog (Jerome Guitton, Joel Brobecker):

	* ravenscar-thread.c, ravenscar-thread.h, ravenscar-sparc-thread.c:
	New files.
	* configure.tgt (sparc-*-*): Add ravenscar-thread.o and
	ravenscar-sparc-thread.o to gdb_target_obs.

1 files changed, 185 insertions, 0 deletions

diff --git a/gdb/ravenscar-sparc-thread.c b/gdb/ravenscar-sparc-thread.c
new file mode 100644
index 0000000..197b745
--- /dev/null
+++ b/gdb/ravenscar-sparc-thread.c
@@ -0,0 +1,185 @@
+/* Ravenscar SPARC target support.
+
+   Copyright 2004, 2010 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 "gdbcore.h"
+#include "regcache.h"
+#include "sparc-tdep.h"
+#include "inferior.h"
+#include "ravenscar-thread.h"
+
+static struct ravenscar_arch_ops ravenscar_sparc_ops;
+
+static void ravenscar_sparc_fetch_registers (struct regcache *regcache,
+                                             int regnum);
+static void ravenscar_sparc_store_registers (struct regcache *regcache,
+                                             int regnum);
+static void ravenscar_sparc_prepare_to_store (struct regcache *regcache);
+
+/* Register offsets from a referenced address (exempli gratia the
+   Thread_Descriptor). The referenced address depends on the register
+   number. The Thread_Descriptor layout and the stack layout are documented
+   in the GNAT sources, in sparc-bb.h.  */
+
+static const int sparc_register_offsets[] =
+{
+  /* G0 - G7 */
+  -1,   0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
+  /* O0 - O7 */
+  0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
+  /* L0 - L7 */
+  0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
+  /* I0 - I7 */
+  0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
+  /* F0 - F31 */
+  0x50, 0x54, 0x58, 0x5C, 0x60, 0x64, 0x68, 0x6C,
+  0x70, 0x74, 0x78, 0x7C, 0x80, 0x84, 0x88, 0x8C,
+  0x90, 0x94, 0x99, 0x9C, 0xA0, 0xA4, 0xA8, 0xAC,
+  0xB0, 0xB4, 0xBB, 0xBC, 0xC0, 0xC4, 0xC8, 0xCC,
+  /* Y  PSR   WIM   TBR   PC    NPC   FPSR  CPSR */
+  0x40, 0x20, 0x44, -1,   0x1C, -1,   0x4C, -1
+};
+
+/* supply register REGNUM, which has been saved on REGISTER_ADDR, to the
+   regcache.  */
+
+static void
+supply_register_at_address (struct regcache *regcache, int regnum,
+                            CORE_ADDR register_addr)
+{
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  int buf_size = register_size (gdbarch, regnum);
+  char *buf;
+
+  buf = (char *) alloca (buf_size);
+  read_memory (register_addr, buf, buf_size);
+  regcache_raw_supply (regcache, regnum, &buf);
+}
+
+/* Return true if, for a non-running thread, REGNUM has been saved on the
+   stack.  */
+
+static int
+register_on_stack_p (int regnum)
+{
+  return (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
+    || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM);
+}
+
+/* Return true if, for a non-running thread, REGNUM has been saved on the
+   Thread_Descriptor.  */
+
+static int
+register_in_thread_descriptor_p (int regnum)
+{
+  return (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
+    || (regnum == SPARC32_PSR_REGNUM)
+    || (regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
+    || (regnum == SPARC32_Y_REGNUM)
+    || (regnum == SPARC32_WIM_REGNUM)
+    || (regnum == SPARC32_FSR_REGNUM)
+    || (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F0_REGNUM + 31)
+    || (regnum == SPARC32_PC_REGNUM);
+}
+
+/* to_fetch_registers when inferior_ptid is different from the running
+   thread.  */
+
+static void
+ravenscar_sparc_fetch_registers (struct regcache *regcache, int regnum)
+{
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  const int sp_regnum = gdbarch_sp_regnum (gdbarch);
+  const int num_regs = gdbarch_num_regs (gdbarch);
+  int current_regnum;
+  CORE_ADDR current_address;
+  CORE_ADDR thread_descriptor_address;
+  ULONGEST stack_address;
+
+  thread_descriptor_address = (CORE_ADDR) ptid_get_tid (inferior_ptid);
+  current_address = thread_descriptor_address
+    + sparc_register_offsets [sp_regnum];
+  supply_register_at_address (regcache, sp_regnum, current_address);
+  regcache_cooked_read_unsigned (regcache, sp_regnum, &stack_address);
+
+  for (current_regnum = 0; current_regnum < num_regs; current_regnum ++)
+    {
+      if (register_in_thread_descriptor_p (current_regnum))
+        {
+          current_address = thread_descriptor_address
+            + sparc_register_offsets [current_regnum];
+          supply_register_at_address (regcache, current_regnum,
+                                      current_address);
+        }
+      else if (register_on_stack_p (current_regnum))
+        {
+          current_address = stack_address
+            + sparc_register_offsets [current_regnum];
+          supply_register_at_address (regcache, current_regnum,
+                                      current_address);
+        }
+    }
+}
+
+/* to_prepare_to_store when inferior_ptid is different from the running
+   thread.  */
+
+static void
+ravenscar_sparc_prepare_to_store (struct regcache *regcache)
+{
+  /* Nothing to do.  */
+}
+
+/* to_store_registers when inferior_ptid is different from the running
+   thread.  */
+
+static void
+ravenscar_sparc_store_registers (struct regcache *regcache, int regnum)
+{
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  int buf_size = register_size (gdbarch, regnum);
+  char buf [buf_size];
+  ULONGEST register_address;
+
+  if (register_in_thread_descriptor_p (regnum))
+    register_address =
+      ptid_get_tid (inferior_ptid) + sparc_register_offsets [regnum];
+  else if (register_on_stack_p (regnum))
+    {
+      regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM,
+                                     &register_address);
+      register_address += sparc_register_offsets [regnum];
+    }
+  else
+    return;
+
+  regcache_raw_collect (regcache, regnum, buf);
+  write_memory (register_address,
+                buf,
+                buf_size);
+}
+
+void
+_initialize_ravenscar_sparc (void)
+{
+  ravenscar_sparc_ops.to_fetch_registers = ravenscar_sparc_fetch_registers;
+  ravenscar_sparc_ops.to_store_registers = ravenscar_sparc_store_registers;
+  ravenscar_sparc_ops.to_prepare_to_store = ravenscar_sparc_prepare_to_store;
+  ravenscar_register_arch_ops (&ravenscar_sparc_ops);
+}