Add Xtensa port

1 files changed, 593 insertions, 0 deletions

diff --git a/bfd/xtensa-isa.c b/bfd/xtensa-isa.c
new file mode 100644
index 0000000..ffbef53
--- /dev/null
+++ b/bfd/xtensa-isa.c
@@ -0,0 +1,593 @@
+/* Configurable Xtensa ISA support.
+   Copyright 2003 Free Software Foundation, Inc.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <string.h>
+
+#include "xtensa-isa.h"
+#include "xtensa-isa-internal.h"
+
+xtensa_isa xtensa_default_isa = NULL;
+
+static int
+opname_lookup_compare (const void *v1, const void *v2)
+{
+  opname_lookup_entry *e1 = (opname_lookup_entry *)v1;
+  opname_lookup_entry *e2 = (opname_lookup_entry *)v2;
+
+  return strcmp (e1->key, e2->key);
+}
+
+
+xtensa_isa
+xtensa_isa_init (void)
+{
+  xtensa_isa isa;
+  int mod;
+
+  isa = xtensa_load_isa (0);
+  if (isa == 0)
+    {
+      fprintf (stderr, "Failed to initialize Xtensa base ISA module\n");
+      return NULL;
+    }
+
+  for (mod = 1; xtensa_isa_modules[mod].get_num_opcodes_fn; mod++)
+    {
+      if (!xtensa_extend_isa (isa, mod))
+	{
+	  fprintf (stderr, "Failed to initialize Xtensa TIE ISA module\n");
+	  return NULL;
+	}
+    }
+
+  return isa;
+}
+
+/* ISA information.  */
+
+static int
+xtensa_check_isa_config (xtensa_isa_internal *isa,
+			 struct config_struct *config_table)
+{
+  int i, j;
+
+  if (!config_table)
+    {
+      fprintf (stderr, "Error: Empty configuration table in ISA DLL\n");
+      return 0;
+    }
+
+  /* For the first module, save a pointer to the table and record the
+     specified endianness and availability of the density option.  */
+
+  if (isa->num_modules == 0)
+    {
+      int found_memory_order = 0;
+
+      isa->config = config_table;
+      isa->has_density = 1;  /* Default to have density option.  */
+
+      for (i = 0; config_table[i].param_name; i++)
+	{
+	  if (!strcmp (config_table[i].param_name, "IsaMemoryOrder"))
+	    {
+	      isa->is_big_endian =
+		(strcmp (config_table[i].param_value, "BigEndian") == 0);
+	      found_memory_order = 1;
+	    }
+	  if (!strcmp (config_table[i].param_name, "IsaUseDensityInstruction"))
+	    {
+	      isa->has_density = atoi (config_table[i].param_value);
+	    }
+	}
+      if (!found_memory_order)
+	{
+	  fprintf (stderr, "Error: \"IsaMemoryOrder\" missing from "
+		   "configuration table in ISA DLL\n");
+	  return 0;
+	}
+
+      return 1;
+    }
+
+  /* For subsequent modules, check that the parameters match.  Note: This
+     code is sufficient to handle the current model where there are never
+     more than 2 modules; we might at some point want to handle cases where
+     module N > 0 specifies some parameters not included in the base table,
+     and we would then add those to isa->config so that subsequent modules
+     would check against them. */
+
+  for (i = 0; config_table[i].param_name; i++)
+    {
+      for (j = 0; isa->config[j].param_name; j++)
+	{
+	  if (!strcmp (config_table[i].param_name, isa->config[j].param_name))
+	    {
+	      int mismatch;
+	      if (!strcmp (config_table[i].param_name, "IsaCoprocessorCount"))
+		{
+		  /* Only require the coprocessor count to be <= the base.  */
+		  int tiecnt = atoi (config_table[i].param_value);
+		  int basecnt = atoi (isa->config[j].param_value);
+		  mismatch = (tiecnt > basecnt);
+		}
+	      else
+		mismatch = strcmp (config_table[i].param_value,
+				   isa->config[j].param_value);
+	      if (mismatch)
+		{
+#define MISMATCH_MESSAGE \
+"Error: Configuration mismatch in the \"%s\" parameter:\n\
+the configuration used when the TIE file was compiled had a value of\n\
+\"%s\", while the current configuration has a value of\n\
+\"%s\". Please rerun the TIE compiler with a matching\n\
+configuration.\n"
+		  fprintf (stderr, MISMATCH_MESSAGE,
+			   config_table[i].param_name,
+			   config_table[i].param_value,
+			   isa->config[j].param_value);
+		  return 0;
+		}
+	      break;
+	    }
+	}
+    }
+
+  return 1;
+}
+
+
+static int
+xtensa_add_isa (xtensa_isa_internal *isa, libisa_module_specifier libisa)
+{
+  const int (*get_num_opcodes_fn) (void);
+  struct config_struct *(*get_config_table_fn) (void);
+  xtensa_opcode_internal **(*get_opcodes_fn) (void);
+  int (*decode_insn_fn) (const xtensa_insnbuf);
+  xtensa_opcode_internal **opcodes;
+  int opc, insn_size, prev_num_opcodes, new_num_opcodes, this_module;
+
+  get_num_opcodes_fn = xtensa_isa_modules[libisa].get_num_opcodes_fn;
+  get_opcodes_fn = xtensa_isa_modules[libisa].get_opcodes_fn;
+  decode_insn_fn = xtensa_isa_modules[libisa].decode_insn_fn;
+  get_config_table_fn = xtensa_isa_modules[libisa].get_config_table_fn;
+
+  if (!get_num_opcodes_fn || !get_opcodes_fn || !decode_insn_fn
+      || (!get_config_table_fn && isa->num_modules == 0))
+    return 0;
+
+  if (get_config_table_fn
+      && !xtensa_check_isa_config (isa, get_config_table_fn ()))
+    return 0;
+
+  prev_num_opcodes = isa->num_opcodes;
+  new_num_opcodes = (*get_num_opcodes_fn) ();
+
+  isa->num_opcodes += new_num_opcodes;
+  isa->opcode_table = (xtensa_opcode_internal **)
+    realloc (isa->opcode_table, isa->num_opcodes *
+	     sizeof (xtensa_opcode_internal *));
+  isa->opname_lookup_table = (opname_lookup_entry *)
+    realloc (isa->opname_lookup_table, isa->num_opcodes *
+	     sizeof (opname_lookup_entry));
+
+  opcodes = (*get_opcodes_fn) ();
+
+  insn_size = isa->insn_size;
+  for (opc = 0; opc < new_num_opcodes; opc++)
+    {
+      xtensa_opcode_internal *intopc = opcodes[opc];
+      int newopc = prev_num_opcodes + opc;
+      isa->opcode_table[newopc] = intopc;
+      isa->opname_lookup_table[newopc].key = intopc->name;
+      isa->opname_lookup_table[newopc].opcode = newopc;
+      if (intopc->length > insn_size)
+	insn_size = intopc->length;
+    }
+
+  isa->insn_size = insn_size;
+  isa->insnbuf_size = ((isa->insn_size + sizeof (xtensa_insnbuf_word) - 1) /
+		       sizeof (xtensa_insnbuf_word));
+
+  qsort (isa->opname_lookup_table, isa->num_opcodes,
+	 sizeof (opname_lookup_entry), opname_lookup_compare);
+
+  /* Check for duplicate opcode names.  */
+  for (opc = 1; opc < isa->num_opcodes; opc++)
+    {
+      if (!opname_lookup_compare (&isa->opname_lookup_table[opc-1],
+				  &isa->opname_lookup_table[opc]))
+	{
+	  fprintf (stderr, "Error: Duplicate TIE opcode \"%s\"\n",
+		   isa->opname_lookup_table[opc].key);
+	  return 0;
+	}
+    }
+
+  this_module = isa->num_modules;
+  isa->num_modules += 1;
+
+  isa->module_opcode_base = (int *) realloc (isa->module_opcode_base,
+					     isa->num_modules * sizeof (int));
+  isa->module_decode_fn = (xtensa_insn_decode_fn *)
+    realloc (isa->module_decode_fn, isa->num_modules *
+	     sizeof (xtensa_insn_decode_fn));
+
+  isa->module_opcode_base[this_module] = prev_num_opcodes;
+  isa->module_decode_fn[this_module] = decode_insn_fn;
+
+  xtensa_default_isa = isa;
+
+  return 1;	/* Library was successfully added.  */
+}
+
+
+xtensa_isa
+xtensa_load_isa (libisa_module_specifier libisa)
+{
+  xtensa_isa_internal *isa;
+
+  isa = (xtensa_isa_internal *) malloc (sizeof (xtensa_isa_internal));
+  memset (isa, 0, sizeof (xtensa_isa_internal));
+  if (!xtensa_add_isa (isa, libisa))
+    {
+      xtensa_isa_free (isa);
+      return NULL;
+    }
+  return (xtensa_isa) isa;
+}
+
+
+int
+xtensa_extend_isa (xtensa_isa isa, libisa_module_specifier libisa)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  return xtensa_add_isa (intisa, libisa);
+}
+
+
+void
+xtensa_isa_free (xtensa_isa isa)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  if (intisa->opcode_table)
+    free (intisa->opcode_table);
+  if (intisa->opname_lookup_table)
+    free (intisa->opname_lookup_table);
+  if (intisa->module_opcode_base)
+    free (intisa->module_opcode_base);
+  if (intisa->module_decode_fn)
+    free (intisa->module_decode_fn);
+  free (intisa);
+}
+
+
+int
+xtensa_insn_maxlength (xtensa_isa isa)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  return intisa->insn_size;
+}
+
+
+int
+xtensa_insnbuf_size (xtensa_isa isa)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *)isa;
+  return intisa->insnbuf_size;
+}
+
+
+int
+xtensa_num_opcodes (xtensa_isa isa)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  return intisa->num_opcodes;
+}
+
+
+xtensa_opcode
+xtensa_opcode_lookup (xtensa_isa isa, const char *opname)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  opname_lookup_entry entry, *result;
+
+  entry.key = opname;
+  result = bsearch (&entry, intisa->opname_lookup_table, intisa->num_opcodes,
+		    sizeof (opname_lookup_entry), opname_lookup_compare);
+  if (!result) return XTENSA_UNDEFINED;
+  return result->opcode;
+}
+
+
+xtensa_opcode
+xtensa_decode_insn (xtensa_isa isa, const xtensa_insnbuf insn)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  int n, opc;
+  for (n = 0; n < intisa->num_modules; n++) {
+    opc = (intisa->module_decode_fn[n]) (insn);
+    if (opc != XTENSA_UNDEFINED)
+      return intisa->module_opcode_base[n] + opc;
+  }
+  return XTENSA_UNDEFINED;
+}
+
+
+/* Opcode information.  */
+
+void
+xtensa_encode_insn (xtensa_isa isa, xtensa_opcode opc, xtensa_insnbuf insn)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  xtensa_insnbuf template = intisa->opcode_table[opc]->template();
+  int len = intisa->opcode_table[opc]->length;
+  int n;
+
+  /* Convert length to 32-bit words.  */
+  len = (len + 3) / 4;
+
+  /* Copy the template.  */
+  for (n = 0; n < len; n++)
+    insn[n] = template[n];
+
+  /* Fill any unused buffer space with zeros.  */
+  for ( ; n < intisa->insnbuf_size; n++)
+    insn[n] = 0;
+}
+
+
+const char *
+xtensa_opcode_name (xtensa_isa isa, xtensa_opcode opc)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  return intisa->opcode_table[opc]->name;
+}
+
+
+int
+xtensa_insn_length (xtensa_isa isa, xtensa_opcode opc)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  return intisa->opcode_table[opc]->length;
+}
+
+
+int
+xtensa_insn_length_from_first_byte (xtensa_isa isa, char first_byte)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  int is_density = (first_byte & (intisa->is_big_endian ? 0x80 : 0x08)) != 0;
+  return (intisa->has_density && is_density ? 2 : 3);
+}
+
+
+int
+xtensa_num_operands (xtensa_isa isa, xtensa_opcode opc)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  return intisa->opcode_table[opc]->iclass->num_operands;
+}
+
+
+xtensa_operand
+xtensa_get_operand (xtensa_isa isa, xtensa_opcode opc, int opnd)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  xtensa_iclass_internal *iclass = intisa->opcode_table[opc]->iclass;
+  if (opnd >= iclass->num_operands)
+    return NULL;
+  return (xtensa_operand) iclass->operands[opnd];
+}
+
+
+/* Operand information.  */
+
+char *
+xtensa_operand_kind (xtensa_operand opnd)
+{
+  xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
+  return intop->operand_kind;
+}
+
+
+char
+xtensa_operand_inout (xtensa_operand opnd)
+{
+  xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
+  return intop->inout;
+}
+
+
+uint32
+xtensa_operand_get_field (xtensa_operand opnd, const xtensa_insnbuf insn)
+{
+  xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
+  return (*intop->get_field) (insn);
+}
+
+
+void
+xtensa_operand_set_field (xtensa_operand opnd, xtensa_insnbuf insn, uint32 val)
+{
+  xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
+  return (*intop->set_field) (insn, val);
+}
+
+
+xtensa_encode_result
+xtensa_operand_encode (xtensa_operand opnd, uint32 *valp)
+{
+  xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
+  return (*intop->encode) (valp);
+}
+
+
+uint32
+xtensa_operand_decode (xtensa_operand opnd, uint32 val)
+{
+  xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
+  return (*intop->decode) (val);
+}
+
+
+int
+xtensa_operand_isPCRelative (xtensa_operand opnd)
+{
+  xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
+  return intop->isPCRelative;
+}
+
+
+uint32
+xtensa_operand_do_reloc (xtensa_operand opnd, uint32 addr, uint32 pc)
+{
+  xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
+  if (!intop->isPCRelative)
+    return addr;
+  return (*intop->do_reloc) (addr, pc);
+}
+
+
+uint32
+xtensa_operand_undo_reloc (xtensa_operand opnd, uint32 offset, uint32 pc)
+{
+  xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
+  if (!intop->isPCRelative)
+    return offset;
+  return (*intop->undo_reloc) (offset, pc);
+}
+
+
+/* Instruction buffers.  */
+
+xtensa_insnbuf
+xtensa_insnbuf_alloc (xtensa_isa isa)
+{
+  return (xtensa_insnbuf) malloc (xtensa_insnbuf_size (isa) *
+				  sizeof (xtensa_insnbuf_word));
+}
+
+
+void
+xtensa_insnbuf_free (xtensa_insnbuf buf)
+{
+  free( buf );
+}
+
+
+/* Given <byte_index>, the index of a byte in a xtensa_insnbuf, our
+   internal representation of a xtensa instruction word, return the index of
+   its word and the bit index of its low order byte in the xtensa_insnbuf.  */
+
+static inline int
+byte_to_word_index (int byte_index)
+{
+  return byte_index / sizeof (xtensa_insnbuf_word);
+}
+
+
+static inline int
+byte_to_bit_index (int byte_index)
+{
+  return (byte_index & 0x3) * 8;
+}
+
+
+/* Copy an instruction in the 32 bit words pointed at by <insn> to characters
+   pointed at by <cp>.  This is more complicated than you might think because
+   we want 16 bit instructions in bytes 2,3 for big endian. This function
+   allows us to specify which byte in <insn> to start with and which way to
+   increment, allowing trivial implementation for both big and little endian.
+   And it seems to make pretty good code for both.  */
+
+void
+xtensa_insnbuf_to_chars (xtensa_isa isa, const xtensa_insnbuf insn, char *cp)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  int insn_size = xtensa_insn_maxlength (intisa);
+  int fence_post, start, increment, i, byte_count;
+  xtensa_opcode opc;
+
+  if (intisa->is_big_endian)
+    {
+      start = insn_size - 1;
+      increment = -1;
+    }
+  else
+    {
+      start = 0;
+      increment = 1;
+    }
+
+  /* Find the opcode; do nothing if the buffer does not contain a valid
+     instruction since we need to know how many bytes to copy.  */
+  opc = xtensa_decode_insn (isa, insn);
+  if (opc == XTENSA_UNDEFINED)
+    return;
+
+  byte_count = xtensa_insn_length (isa, opc);
+  fence_post = start + (byte_count * increment);
+
+  for (i = start; i != fence_post; i += increment, ++cp)
+    {
+      int word_inx = byte_to_word_index (i);
+      int bit_inx = byte_to_bit_index (i);
+
+      *cp = (insn[word_inx] >> bit_inx) & 0xff;
+    }
+}
+
+/* Inward conversion from byte stream to xtensa_insnbuf.  See
+   xtensa_insnbuf_to_chars for a discussion of why this is
+   complicated by endianness.  */
+    
+void
+xtensa_insnbuf_from_chars (xtensa_isa isa, xtensa_insnbuf insn, const char* cp)
+{
+  xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
+  int insn_size = xtensa_insn_maxlength (intisa);
+  int fence_post, start, increment, i;
+
+  if (intisa->is_big_endian)
+    {
+      start = insn_size - 1;
+      increment = -1;
+    }
+  else
+    {
+      start = 0;
+      increment = 1;
+    }
+
+  fence_post = start + (insn_size * increment);
+  memset (insn, 0, xtensa_insnbuf_size (isa) * sizeof (xtensa_insnbuf_word));
+
+  for ( i = start; i != fence_post; i += increment, ++cp )
+    {
+      int word_inx = byte_to_word_index (i);
+      int bit_inx = byte_to_bit_index (i);
+
+      insn[word_inx] |= (*cp & 0xff) << bit_inx;
+    }
+}
+