Add moxie-elf port.

1 files changed, 531 insertions, 0 deletions

diff --git a/gdb/moxie-tdep.c b/gdb/moxie-tdep.c
new file mode 100644
index 0000000..884416c
--- /dev/null
+++ b/gdb/moxie-tdep.c
@@ -0,0 +1,531 @@
+/* Target-dependent code for Moxie.
+
+   Copyright (C) 2009 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 "frame.h"
+#include "frame-unwind.h"
+#include "frame-base.h"
+#include "symtab.h"
+#include "gdbtypes.h"
+#include "gdbcmd.h"
+#include "gdbcore.h"
+#include "gdb_string.h"
+#include "value.h"
+#include "inferior.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "osabi.h"
+#include "language.h"
+#include "arch-utils.h"
+#include "regcache.h"
+#include "trad-frame.h"
+#include "dis-asm.h"
+
+#include "gdb_assert.h"
+
+#include "moxie-tdep.h"
+
+/* Local functions.  */
+
+extern void _initialize_moxie_tdep (void);
+
+/* Use an invalid address value as 'not available' marker.  */
+enum { REG_UNAVAIL = (CORE_ADDR) -1 };
+
+struct moxie_frame_cache
+{
+  /* Base address.  */
+  CORE_ADDR base;
+  CORE_ADDR pc;
+  LONGEST framesize;
+  CORE_ADDR saved_regs[MOXIE_NUM_REGS];
+  CORE_ADDR saved_sp;
+};
+
+/* Implement the "frame_align" gdbarch method.  */
+
+static CORE_ADDR
+moxie_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
+{
+  /* Align to the size of an instruction (so that they can safely be
+     pushed onto the stack.  */
+  return sp & ~1;
+}
+
+/* Implement the "breakpoint_from_pc" gdbarch method.  */
+
+const static unsigned char *
+moxie_breakpoint_from_pc (struct gdbarch *gdbarch, 
+			  CORE_ADDR *pcptr, int *lenptr)
+{
+  static unsigned char breakpoint[] = { 0x35, 0x00 };
+
+  *lenptr = sizeof (breakpoint);
+  return breakpoint;
+}
+
+/* Moxie register names.  */
+
+char *moxie_register_names[] = {
+  "$fp",  "$sp",  "$r0",  "$r1",  "$r2",
+  "$r3",  "$r4",  "$r5", "$r6", "$r7",
+  "$r8", "$r9", "$r10", "$r11", "$r12",
+  "$r13", "$pc", "$cc" };
+
+/* Implement the "register_name" gdbarch method.  */
+
+static const char *
+moxie_register_name (struct gdbarch *gdbarch, int reg_nr)
+{
+  if (reg_nr < 0)
+    return NULL;
+  if (reg_nr >= MOXIE_NUM_REGS)
+    return NULL;
+  return moxie_register_names[reg_nr];
+}
+
+/* Implement the "register_type" gdbarch method.  */
+
+static struct type *
+moxie_register_type (struct gdbarch *gdbarch, int reg_nr)
+{
+  if (reg_nr == MOXIE_PC_REGNUM)
+    return  builtin_type (gdbarch)->builtin_func_ptr;
+  else if (reg_nr == MOXIE_SP_REGNUM || reg_nr == MOXIE_FP_REGNUM)
+    return builtin_type (gdbarch)->builtin_data_ptr;
+  else
+    return builtin_type_int32;
+}
+
+/* Write into appropriate registers a function return value
+   of type TYPE, given in virtual format.  */
+
+static void
+moxie_store_return_value (struct type *type, struct regcache *regcache,
+			 const void *valbuf)
+{
+  CORE_ADDR regval;
+  int len = TYPE_LENGTH (type);
+
+  /* Things always get returned in RET1_REGNUM, RET2_REGNUM.  */
+  regval = extract_unsigned_integer (valbuf, len > 4 ? 4 : len);
+  regcache_cooked_write_unsigned (regcache, RET1_REGNUM, regval);
+  if (len > 4)
+    {
+      regval = extract_unsigned_integer ((gdb_byte *) valbuf + 4, len - 4);
+      regcache_cooked_write_unsigned (regcache, RET1_REGNUM + 1, regval);
+    }
+}
+
+/* Decode the instructions within the given address range.  Decide
+   when we must have reached the end of the function prologue.  If a
+   frame_info pointer is provided, fill in its saved_regs etc.
+
+   Returns the address of the first instruction after the prologue.  */
+
+static CORE_ADDR
+moxie_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
+		      struct moxie_frame_cache *cache,
+		      struct frame_info *this_frame)
+{
+  CORE_ADDR next_addr;
+  ULONGEST inst, inst2;
+  LONGEST offset;
+  int regnum;
+
+  /* Record where the jsra instruction saves the PC and FP.  */
+  cache->saved_regs[MOXIE_PC_REGNUM] = -4;
+  cache->saved_regs[MOXIE_FP_REGNUM] = 0;
+  cache->framesize = 0;
+
+  if (start_addr >= end_addr)
+    return end_addr;
+
+  for (next_addr = start_addr; next_addr < end_addr; )
+    {
+      inst = read_memory_unsigned_integer (next_addr, 2);
+
+      /* Match "push $rN" where N is between 2 and 13 inclusive.  */
+      if (inst >= 0x0614 && inst <= 0x061f)
+	{
+	  regnum = inst & 0x000f;
+	  cache->framesize += 4;
+	  cache->saved_regs[regnum] = cache->framesize;
+	  next_addr += 2;
+	}
+
+      /* Optional stack allocation for args and local vars <= 4
+	 byte.  */
+      else if (inst == 0x01f0)           /* ldi.l $r12, X */
+	{
+	  offset = read_memory_integer (next_addr + 2, 4);
+	  inst2 = read_memory_unsigned_integer (next_addr + 6, 2);
+
+	  if (inst2 == 0x051f)           /* add.l $sp, $r12 */
+	    {
+	      cache->framesize += offset;
+	    }
+
+	  return (next_addr + 8);
+	}
+      else  /* This is not a prologue instruction.  */
+	break;
+    }
+
+  return next_addr;
+}
+
+/* Find the end of function prologue.  */
+
+static CORE_ADDR
+moxie_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+  CORE_ADDR func_addr = 0, func_end = 0;
+  char *func_name;
+
+  /* See if we can determine the end of the prologue via the symbol table.
+     If so, then return either PC, or the PC after the prologue, whichever
+     is greater.  */
+  if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end))
+    {
+      CORE_ADDR post_prologue_pc = skip_prologue_using_sal (func_addr);
+      if (post_prologue_pc != 0)
+	return max (pc, post_prologue_pc);
+      else
+	{
+	  /* Can't determine prologue from the symbol table, need to examine
+	     instructions.  */
+	  struct symtab_and_line sal;
+	  struct symbol *sym;
+	  struct moxie_frame_cache cache;
+	  CORE_ADDR plg_end;
+	  
+	  memset (&cache, 0, sizeof cache);
+	  
+	  plg_end = moxie_analyze_prologue (func_addr, 
+					    func_end, &cache, NULL);
+	  /* Found a function.  */
+	  sym = lookup_symbol (func_name, NULL, VAR_DOMAIN, NULL);
+	  /* Don't use line number debug info for assembly source
+	     files. */
+	  if (sym && SYMBOL_LANGUAGE (sym) != language_asm)
+	    {
+	      sal = find_pc_line (func_addr, 0);
+	      if (sal.end && sal.end < func_end)
+		{
+		  /* Found a line number, use it as end of
+		     prologue.  */
+		  return sal.end;
+		}
+	    }
+	  /* No useable line symbol.  Use result of prologue parsing
+	     method.  */
+	  return plg_end;
+	}
+    }
+
+  /* No function symbol -- just return the PC.  */
+  return (CORE_ADDR) pc;
+}
+
+struct moxie_unwind_cache
+{
+  /* The previous frame's inner most stack address.  Used as this
+     frame ID's stack_addr.  */
+  CORE_ADDR prev_sp;
+  /* The frame's base, optionally used by the high-level debug info.  */
+  CORE_ADDR base;
+  int size;
+  /* How far the SP and r13 (FP) have been offset from the start of
+     the stack frame (as defined by the previous frame's stack
+     pointer).  */
+  LONGEST sp_offset;
+  LONGEST r13_offset;
+  int uses_frame;
+  /* Table indicating the location of each and every register.  */
+  struct trad_frame_saved_reg *saved_regs;
+};
+
+/* Implement the "read_pc" gdbarch method.  */
+
+static CORE_ADDR
+moxie_read_pc (struct regcache *regcache)
+{
+  ULONGEST pc;
+
+  regcache_cooked_read_unsigned (regcache, MOXIE_PC_REGNUM, &pc);
+  return pc;
+}
+
+/* Implement the "write_pc" gdbarch method.  */
+
+static void
+moxie_write_pc (struct regcache *regcache, CORE_ADDR val)
+{
+  regcache_cooked_write_unsigned (regcache, MOXIE_PC_REGNUM, val);
+}
+
+/* Implement the "unwind_pc" gdbarch method.  */
+
+static CORE_ADDR
+moxie_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+  return frame_unwind_register_unsigned (next_frame, MOXIE_SP_REGNUM);
+}
+
+/* Given a return value in `regbuf' with a type `valtype', 
+   extract and copy its value into `valbuf'.  */
+
+static void
+moxie_extract_return_value (struct type *type, struct regcache *regcache,
+			   void *dst)
+{
+  bfd_byte *valbuf = dst;
+  int len = TYPE_LENGTH (type);
+  ULONGEST tmp;
+
+  /* By using store_unsigned_integer we avoid having to do
+     anything special for small big-endian values.  */
+  regcache_cooked_read_unsigned (regcache, RET1_REGNUM, &tmp);
+  store_unsigned_integer (valbuf, (len > 4 ? len - 4 : len), tmp);
+
+  /* Ignore return values more than 8 bytes in size because the moxie
+     returns anything more than 8 bytes in the stack.  */
+  if (len > 4)
+    {
+      regcache_cooked_read_unsigned (regcache, RET1_REGNUM + 1, &tmp);
+      store_unsigned_integer (valbuf + len - 4, 4, tmp);
+    }
+}
+
+/* Implement the "return_value" gdbarch method.  */
+
+static enum return_value_convention
+moxie_return_value (struct gdbarch *gdbarch, struct type *func_type,
+		   struct type *valtype, struct regcache *regcache,
+		   gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+  if (TYPE_LENGTH (valtype) > 8)
+    return RETURN_VALUE_STRUCT_CONVENTION;
+  else
+    {
+      if (readbuf != NULL)
+	moxie_extract_return_value (valtype, regcache, readbuf);
+      if (writebuf != NULL)
+	moxie_store_return_value (valtype, regcache, writebuf);
+      return RETURN_VALUE_REGISTER_CONVENTION;
+    }
+}
+
+/* Allocate and initialize a moxie_frame_cache object.  */
+
+static struct moxie_frame_cache *
+moxie_alloc_frame_cache (void)
+{
+  struct moxie_frame_cache *cache;
+  int i;
+
+  cache = FRAME_OBSTACK_ZALLOC (struct moxie_frame_cache);
+
+  cache->base = 0;
+  cache->saved_sp = 0;
+  cache->pc = 0;
+  cache->framesize = 0;
+  for (i = 0; i < MOXIE_NUM_REGS; ++i)
+    cache->saved_regs[i] = REG_UNAVAIL;
+
+  return cache;
+}
+
+/* Populate a moxie_frame_cache object for this_frame.  */
+
+static struct moxie_frame_cache *
+moxie_frame_cache (struct frame_info *this_frame, void **this_cache)
+{
+  struct moxie_frame_cache *cache;
+  CORE_ADDR current_pc;
+  int i;
+
+  if (*this_cache)
+    return *this_cache;
+
+  cache = moxie_alloc_frame_cache ();
+  *this_cache = cache;
+
+  cache->base = get_frame_register_unsigned (this_frame, MOXIE_FP_REGNUM);
+  if (cache->base == 0)
+    return cache;
+
+  cache->pc = get_frame_func (this_frame);
+  current_pc = get_frame_pc (this_frame);
+  if (cache->pc)
+    moxie_analyze_prologue (cache->pc, current_pc, cache, this_frame);
+
+  cache->saved_sp = cache->base - cache->framesize;
+
+  for (i = 0; i < MOXIE_NUM_REGS; ++i)
+    if (cache->saved_regs[i] != REG_UNAVAIL)
+      cache->saved_regs[i] = cache->base - cache->saved_regs[i];
+
+  return cache;
+}
+
+/* Implement the "unwind_pc" gdbarch method.  */
+
+static CORE_ADDR
+moxie_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+  return frame_unwind_register_unsigned (next_frame, MOXIE_PC_REGNUM);
+}
+
+/* Given a GDB frame, determine the address of the calling function's
+   frame.  This will be used to create a new GDB frame struct.  */
+
+static void
+moxie_frame_this_id (struct frame_info *this_frame,
+		    void **this_prologue_cache, struct frame_id *this_id)
+{
+  struct moxie_frame_cache *cache = moxie_frame_cache (this_frame,
+						   this_prologue_cache);
+
+  /* This marks the outermost frame.  */
+  if (cache->base == 0)
+    return;
+
+  *this_id = frame_id_build (cache->saved_sp, cache->pc);
+}
+
+/* Get the value of register regnum in the previous stack frame.  */
+
+static struct value *
+moxie_frame_prev_register (struct frame_info *this_frame,
+			  void **this_prologue_cache, int regnum)
+{
+  struct moxie_frame_cache *cache = moxie_frame_cache (this_frame,
+						   this_prologue_cache);
+
+  gdb_assert (regnum >= 0);
+
+  if (regnum == MOXIE_SP_REGNUM && cache->saved_sp)
+    return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp);
+
+  if (regnum < MOXIE_NUM_REGS && cache->saved_regs[regnum] != REG_UNAVAIL)
+    return frame_unwind_got_memory (this_frame, regnum,
+				    cache->saved_regs[regnum]);
+
+  return frame_unwind_got_register (this_frame, regnum, regnum);
+}
+
+static const struct frame_unwind moxie_frame_unwind = {
+  NORMAL_FRAME,
+  moxie_frame_this_id,
+  moxie_frame_prev_register,
+  NULL,
+  default_frame_sniffer
+};
+
+/* Return the base address of this_frame.  */
+
+static CORE_ADDR
+moxie_frame_base_address (struct frame_info *this_frame, void **this_cache)
+{
+  struct moxie_frame_cache *cache = moxie_frame_cache (this_frame,
+						       this_cache);
+
+  return cache->base;
+}
+
+static const struct frame_base moxie_frame_base = {
+  &moxie_frame_unwind,
+  moxie_frame_base_address,
+  moxie_frame_base_address,
+  moxie_frame_base_address
+};
+
+static struct frame_id
+moxie_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
+{
+  CORE_ADDR sp = get_frame_register_unsigned (this_frame, MOXIE_SP_REGNUM);
+
+  return frame_id_build (sp, get_frame_pc (this_frame));
+}
+
+/* Allocate and initialize the moxie gdbarch object.  */
+
+static struct gdbarch *
+moxie_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+  struct gdbarch *gdbarch;
+  struct gdbarch_tdep *tdep;
+
+  /* If there is already a candidate, use it.  */
+  arches = gdbarch_list_lookup_by_info (arches, &info);
+  if (arches != NULL)
+    return arches->gdbarch;
+
+  /* Allocate space for the new architecture.  */
+  tdep = XMALLOC (struct gdbarch_tdep);
+  gdbarch = gdbarch_alloc (&info, tdep);
+
+  set_gdbarch_read_pc (gdbarch, moxie_read_pc);
+  set_gdbarch_write_pc (gdbarch, moxie_write_pc);
+  set_gdbarch_unwind_sp (gdbarch, moxie_unwind_sp);
+
+  set_gdbarch_num_regs (gdbarch, MOXIE_NUM_REGS);
+  set_gdbarch_sp_regnum (gdbarch, MOXIE_SP_REGNUM);
+  set_gdbarch_register_name (gdbarch, moxie_register_name);
+  set_gdbarch_register_type (gdbarch, moxie_register_type);
+
+  set_gdbarch_return_value (gdbarch, moxie_return_value);
+
+  set_gdbarch_skip_prologue (gdbarch, moxie_skip_prologue);
+  set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+  set_gdbarch_breakpoint_from_pc (gdbarch, moxie_breakpoint_from_pc);
+  set_gdbarch_frame_align (gdbarch, moxie_frame_align);
+
+  frame_base_set_default (gdbarch, &moxie_frame_base);
+
+  /* Methods for saving / extracting a dummy frame's ID.  The ID's
+     stack address must match the SP value returned by
+     PUSH_DUMMY_CALL, and saved by generic_save_dummy_frame_tos.  */
+  set_gdbarch_dummy_id (gdbarch, moxie_dummy_id);
+
+  set_gdbarch_unwind_pc (gdbarch, moxie_unwind_pc);
+
+  set_gdbarch_print_insn (gdbarch, print_insn_moxie);
+
+  /* Hook in ABI-specific overrides, if they have been registered.  */
+  gdbarch_init_osabi (info, gdbarch);
+
+  /* Hook in the default unwinders.  */
+  frame_unwind_append_unwinder (gdbarch, &moxie_frame_unwind);
+
+  /* Support simple overlay manager.  */
+  set_gdbarch_overlay_update (gdbarch, simple_overlay_update);
+
+  return gdbarch;
+}
+
+/* Register this machine's init routine.  */
+
+void
+_initialize_moxie_tdep (void)
+{
+  register_gdbarch_init (bfd_arch_moxie, moxie_gdbarch_init);
+}