Add LM32 port.

2 files changed, 469 insertions, 0 deletions

diff --git a/gas/config/tc-lm32.c b/gas/config/tc-lm32.c
new file mode 100644
index 0000000..5d02c3a
--- /dev/null
+++ b/gas/config/tc-lm32.c
@@ -0,0 +1,419 @@
+/* tc-lm32.c - Lattice Mico32 assembler.
+   Copyright 2008   Free Software Foundation, Inc.
+   Contributed by Jon Beniston <jon@beniston.com>
+
+   This file is part of GAS, the GNU Assembler.
+
+   GAS 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, or (at your option)
+   any later version.
+
+   GAS 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 GAS; see the file COPYING.  If not, write to the Free Software
+   Foundation, 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#include <string.h>
+#include <stdlib.h>
+
+#include "as.h"
+#include "safe-ctype.h"
+#include "subsegs.h"
+#include "bfd.h"
+#include "safe-ctype.h"
+#include "opcodes/lm32-desc.h"
+#include "opcodes/lm32-opc.h"
+#include "cgen.h"
+#include "elf/lm32.h"
+
+typedef struct
+{
+  const CGEN_INSN *insn;
+  const CGEN_INSN *orig_insn;
+  CGEN_FIELDS fields;
+#if CGEN_INT_INSN_P
+  CGEN_INSN_INT buffer [1];
+#define INSN_VALUE(buf) (*(buf))
+#else
+  unsigned char buffer[CGEN_MAX_INSN_SIZE];
+#define INSN_VALUE(buf) (buf)
+#endif
+  char *addr;
+  fragS *frag;
+  int num_fixups;
+  fixS *fixups[GAS_CGEN_MAX_FIXUPS];
+  int indices[MAX_OPERAND_INSTANCES];
+} lm32_insn;
+
+/* Configuration options */
+
+#define LM_CFG_MULTIPLIY_ENABLED        0x0001
+#define LM_CFG_DIVIDE_ENABLED           0x0002
+#define LM_CFG_BARREL_SHIFT_ENABLED     0x0004
+#define LM_CFG_SIGN_EXTEND_ENABLED      0x0008
+#define LM_CFG_USER_ENABLED             0x0010
+#define LM_CFG_ICACHE_ENABLED           0x0020
+#define LM_CFG_DCACHE_ENABLED           0x0040
+#define LM_CFG_BREAK_ENABLED            0x0080
+
+static unsigned config = 0U;
+
+/* Target specific assembler tokens / delimiters.  */
+
+const char comment_chars[]        = "#";
+const char line_comment_chars[]   = "#";
+const char line_separator_chars[] = ";";
+const char EXP_CHARS[]            = "eE";
+const char FLT_CHARS[]            = "dD";
+
+/* Target specific assembly directives.  */
+
+const pseudo_typeS md_pseudo_table[] =
+{
+  { "align",   s_align_bytes,       0 },
+  { "byte",    cons,                1 },
+  { "hword",   cons,                2 },
+  { "word",    cons,                4 },
+  { "dword",   cons,                8 },
+  {(char *)0 , (void(*)(int))0,     0}
+};
+
+/* Target specific command line options.  */
+
+const char * md_shortopts = "";
+
+struct option md_longopts[] =
+{
+#define OPTION_MULTIPLY_ENABLED         (OPTION_MD_BASE + 1)
+  { "mmultiply-enabled",            no_argument, NULL, OPTION_MULTIPLY_ENABLED },
+#define OPTION_DIVIDE_ENABLED           (OPTION_MD_BASE + 2)
+  { "mdivide-enabled",              no_argument, NULL, OPTION_DIVIDE_ENABLED },
+#define OPTION_BARREL_SHIFT_ENABLED     (OPTION_MD_BASE + 3)
+  { "mbarrel-shift-enabled",        no_argument, NULL, OPTION_BARREL_SHIFT_ENABLED },
+#define OPTION_SIGN_EXTEND_ENABLED      (OPTION_MD_BASE + 4)
+  { "msign-extend-enabled",         no_argument, NULL, OPTION_SIGN_EXTEND_ENABLED },
+#define OPTION_USER_ENABLED             (OPTION_MD_BASE + 5)
+  { "muser-enabled",                no_argument, NULL, OPTION_USER_ENABLED },
+#define OPTION_ICACHE_ENABLED           (OPTION_MD_BASE + 6)
+  { "micache-enabled",              no_argument, NULL, OPTION_ICACHE_ENABLED },
+#define OPTION_DCACHE_ENABLED           (OPTION_MD_BASE + 7)
+  { "mdcache-enabled",              no_argument, NULL, OPTION_DCACHE_ENABLED },
+#define OPTION_BREAK_ENABLED            (OPTION_MD_BASE + 8)
+  { "mbreak-enabled",               no_argument, NULL, OPTION_BREAK_ENABLED },
+#define OPTION_ALL_ENABLED              (OPTION_MD_BASE + 9)
+  { "mall-enabled",                 no_argument, NULL, OPTION_ALL_ENABLED },
+};
+
+size_t md_longopts_size = sizeof (md_longopts);
+
+/* Display architecture specific options.  */
+
+void
+md_show_usage (FILE * fp)
+{
+  fprintf (fp, "LM32 specific options:\n"
+        "  -mmultiply-enabled          enable multiply instructions\n"
+        "  -mdivide-enabled            enable divide and modulus instructions\n"
+        "  -mbarrel-shift-enabled      enable multi-bit shift instructions\n"
+        "  -msign-extend-enabled       enable sign-extension instructions\n"
+        "  -muser-enabled              enable user-defined instructions\n"
+        "  -micache-enabled            enable instruction cache instructions\n"
+        "  -mdcache-enabled            enable data cache instructions\n"
+        "  -mbreak-enabled             enable the break instruction\n"
+        "  -mall-enabled               enable all optional instructions\n"
+        );
+}
+
+/* Parse command line options.  */
+
+int
+md_parse_option (int c, char * arg ATTRIBUTE_UNUSED)
+{
+  switch (c)
+    {
+      case OPTION_MULTIPLY_ENABLED:
+        config |= LM_CFG_MULTIPLIY_ENABLED;
+        break;
+      case OPTION_DIVIDE_ENABLED:
+        config |= LM_CFG_DIVIDE_ENABLED;
+        break;
+      case OPTION_BARREL_SHIFT_ENABLED:
+        config |= LM_CFG_BARREL_SHIFT_ENABLED;
+        break;
+      case OPTION_SIGN_EXTEND_ENABLED:
+        config |= LM_CFG_SIGN_EXTEND_ENABLED;
+        break;
+      case OPTION_USER_ENABLED:
+        config |= LM_CFG_USER_ENABLED;
+        break;
+      case OPTION_ICACHE_ENABLED:
+        config |= LM_CFG_ICACHE_ENABLED;
+        break;
+      case OPTION_DCACHE_ENABLED:
+        config |= LM_CFG_DCACHE_ENABLED;
+        break;
+      case OPTION_BREAK_ENABLED:
+        config |= LM_CFG_BREAK_ENABLED;
+        break;
+      case OPTION_ALL_ENABLED:
+        config |= LM_CFG_MULTIPLIY_ENABLED;
+        config |= LM_CFG_DIVIDE_ENABLED;
+        config |= LM_CFG_BARREL_SHIFT_ENABLED;
+        config |= LM_CFG_SIGN_EXTEND_ENABLED;
+        config |= LM_CFG_USER_ENABLED;
+        config |= LM_CFG_ICACHE_ENABLED;
+        config |= LM_CFG_DCACHE_ENABLED;
+        config |= LM_CFG_BREAK_ENABLED;
+        break;
+      default:
+        return 0;
+    }
+  return 1;
+}
+
+/* Do any architecture specific initialisation.  */
+
+void
+md_begin (void)
+{
+  /* Initialize the `cgen' interface.  */
+
+  /* Set the machine number and endian.  */
+  gas_cgen_cpu_desc = lm32_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
+					   CGEN_CPU_OPEN_ENDIAN,
+					   CGEN_ENDIAN_BIG,
+					   CGEN_CPU_OPEN_END);
+  lm32_cgen_init_asm (gas_cgen_cpu_desc);
+
+  /* This is a callback from cgen to gas to parse operands.  */
+  cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
+}
+
+/* Turn an integer of n bytes (in val) into a stream of bytes appropriate
+   for use in the a.out file, and stores them in the array pointed to by buf. */
+
+void
+md_number_to_chars (char * buf, valueT val, int n)
+{
+  if (target_big_endian)
+    number_to_chars_bigendian (buf, val, n);
+  else
+    number_to_chars_littleendian (buf, val, n);
+}
+
+/* Turn a string in input_line_pointer into a floating point constant
+   of type TYPE, and store the appropriate bytes in *LITP.  The number
+   of LITTLENUMS emitted is stored in *SIZEP.  An error message is
+   returned, or NULL on OK.  */
+
+char *
+md_atof (int type, char *litP, int *sizeP)
+{
+  int i;
+  int prec;
+  LITTLENUM_TYPE words[4];
+
+  char *t;
+
+  switch (type)
+    {
+    case 'f':
+      prec = 2;
+      break;
+    case 'd':
+      prec = 4;
+      break;
+    default:
+      *sizeP = 0;
+      return _("bad call to md_atof");
+    }
+
+  t = atof_ieee (input_line_pointer, type, words);
+  if (t)
+    input_line_pointer = t;
+
+  *sizeP = prec * sizeof (LITTLENUM_TYPE);
+
+  if (target_big_endian)
+    {
+      for (i = 0; i < prec; i++)
+	{
+	  md_number_to_chars (litP, (valueT) words[i],
+			      sizeof (LITTLENUM_TYPE));
+	  litP += sizeof (LITTLENUM_TYPE);
+	}
+    }
+  else
+    {
+      for (i = prec - 1; i >= 0; i--)
+	{
+	  md_number_to_chars (litP, (valueT) words[i],
+			      sizeof (LITTLENUM_TYPE));
+	  litP += sizeof (LITTLENUM_TYPE);
+	}
+    }
+
+  return NULL;
+}
+
+/* Called for each undefined symbol. */
+
+symbolS *
+md_undefined_symbol (char * name ATTRIBUTE_UNUSED)
+{
+  return 0;
+}
+
+/* Round up a section size to the appropriate boundary.  */
+
+valueT
+md_section_align (asection *seg, valueT addr)
+{
+  int align = bfd_get_section_alignment (stdoutput, seg);
+  return ((addr + (1 << align) - 1) & (-1 << align));
+}
+
+/* This function assembles the instructions. It emits the frags/bytes to the
+   sections and creates the relocation entries.  */
+
+void
+md_assemble (char * str)
+{
+  lm32_insn insn;
+  char * errmsg;
+
+  /* Initialize GAS's cgen interface for a new instruction.  */
+  gas_cgen_init_parse ();
+
+  insn.insn = lm32_cgen_assemble_insn
+      (gas_cgen_cpu_desc, str, &insn.fields, insn.buffer, &errmsg);
+
+  if (!insn.insn)
+    {
+      as_bad ("%s", errmsg);
+      return;
+    }
+
+  gas_cgen_finish_insn (insn.insn, insn.buffer,
+			CGEN_FIELDS_BITSIZE (&insn.fields), 1, NULL);
+}
+
+/* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
+   Returns BFD_RELOC_NONE if no reloc type can be found.
+   *FIXP may be modified if desired.  */
+
+bfd_reloc_code_real_type
+md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED,
+		      const CGEN_OPERAND *operand,
+		      fixS *fixP ATTRIBUTE_UNUSED)
+{
+  switch (operand->type)
+    {
+    case LM32_OPERAND_GOT16:
+      return BFD_RELOC_LM32_16_GOT;
+    case LM32_OPERAND_GOTOFFHI16:
+      return BFD_RELOC_LM32_GOTOFF_HI16;
+    case LM32_OPERAND_GOTOFFLO16:
+      return BFD_RELOC_LM32_GOTOFF_LO16;
+    case LM32_OPERAND_GP16:
+      return BFD_RELOC_GPREL16;
+    case LM32_OPERAND_LO16:
+      return BFD_RELOC_LO16;
+    case LM32_OPERAND_HI16:
+      return BFD_RELOC_HI16;
+    case LM32_OPERAND_BRANCH:
+      return BFD_RELOC_LM32_BRANCH;
+    case LM32_OPERAND_CALL:
+      return BFD_RELOC_LM32_CALL;
+    default:
+      break;
+    }
+  return BFD_RELOC_NONE;
+}
+
+/* Return the position from which the PC relative adjustment for a PC relative
+   fixup should be made.  */
+
+long
+md_pcrel_from (fixS *fixP)
+{
+  /* Shouldn't get called.  */
+  abort ();
+  /* Return address of current instruction.  */
+  return fixP->fx_where + fixP->fx_frag->fr_address;
+}
+
+/* The location from which a PC relative jump should be calculated,
+   given a PC relative reloc.  */
+
+long
+md_pcrel_from_section (fixS * fixP, segT sec)
+{
+  if ((fixP->fx_addsy != (symbolS *) NULL)
+      && (! S_IS_DEFINED (fixP->fx_addsy)
+	  || (S_GET_SEGMENT (fixP->fx_addsy) != sec)))
+    {
+      /* The symbol is undefined (or is defined but not in this section).
+	 Let the linker figure it out.  */
+      return 0;
+    }
+
+  /*fprintf(stderr, "%s extern %d local %d\n", S_GET_NAME (fixP->fx_addsy), S_IS_EXTERN (fixP->fx_addsy), S_IS_LOCAL (fixP->fx_addsy));*/
+  /* FIXME: Weak problem? */
+  if ((fixP->fx_addsy != (symbolS *) NULL)
+      && S_IS_EXTERNAL (fixP->fx_addsy))
+    {
+      /* If the symbol is external, let the linker handle it.  */
+      return 0;
+    }
+
+  return fixP->fx_where + fixP->fx_frag->fr_address;
+}
+
+/* Return true if we can partially resolve a relocation now.  */
+
+bfd_boolean
+lm32_fix_adjustable (fixS * fixP)
+{
+  /* We need the symbol name for the VTABLE entries */
+  if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
+      || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
+    return FALSE;
+
+  return TRUE;
+}
+
+/* Relaxation isn't required/supported on this target.  */
+
+int
+md_estimate_size_before_relax (fragS *fragp ATTRIBUTE_UNUSED,
+			       asection *seg ATTRIBUTE_UNUSED)
+{
+  abort ();
+  return 0;
+}
+
+void
+md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
+		 asection *sec ATTRIBUTE_UNUSED,
+		 fragS *fragP ATTRIBUTE_UNUSED)
+{
+  abort ();
+}
+
+void
+md_apply_fix (fixS * fixP, valueT * valP, segT seg)
+{
+  /* Fix for weak symbols. Why do we have fx_addsy for weak symbols?  */
+  if (fixP->fx_addsy != NULL && S_IS_WEAK (fixP->fx_addsy))
+    *valP = 0;
+
+  gas_cgen_md_apply_fix (fixP, valP, seg);
+  return;
+}
diff --git a/gas/config/tc-lm32.h b/gas/config/tc-lm32.h
new file mode 100644
index 0000000..dbba939
--- /dev/null
+++ b/gas/config/tc-lm32.h
@@ -0,0 +1,50 @@
+/* tc-lm32.h -- Header file for tc-lm32.c
+   Copyright 2008   Free Software Foundation, Inc.
+   Contributed by Jon Beniston <jon@beniston.com>
+
+   This file is part of GAS, the GNU Assembler.
+
+   GAS 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, or (at your option)
+   any later version.
+
+   GAS 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 GAS; see the file COPYING.  If not, write to the Free Software
+   Foundation, 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#ifndef TC_LM32_H
+#define TC_LM32_H
+
+#define TARGET_FORMAT "elf32-lm32"
+#define TARGET_ARCH bfd_arch_lm32
+#define TARGET_MACH bfd_mach_lm32
+
+#define TARGET_BYTES_BIG_ENDIAN 1
+
+/* Permit temporary numeric labels.  */
+#define LOCAL_LABELS_FB 1
+
+#define WORKING_DOT_WORD
+
+/* Values passed to md_apply_fix3 don't include the symbol value.  */
+#define MD_APPLY_SYM_VALUE(FIX) 0
+
+#define md_operand(X)
+#define tc_gen_reloc gas_cgen_tc_gen_reloc
+
+/* Call md_pcrel_from_section(), not md_pcrel_from().  */
+extern long md_pcrel_from_section (struct fix *, segT);
+#define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section (FIXP, SEC)
+
+extern bfd_boolean lm32_fix_adjustable (struct fix *);
+#define tc_fix_adjustable(FIX) lm32_fix_adjustable (FIX)
+
+#endif /* TC_LM32_H */
+