[deliverable/binutils-gdb.git] / gas / config / tc-ip2k.c

/* tc-ip2k.c -- Assembler for the Scenix IP2xxx.
   Copyright (C) 2000, 2002, 2003, 2005, 2006 Free Software Foundation.

   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 "as.h"
#include "subsegs.h"     
#include "symcat.h"
#include "opcodes/ip2k-desc.h"
#include "opcodes/ip2k-opc.h"
#include "cgen.h"
#include "elf/common.h"
#include "elf/ip2k.h"
#include "libbfd.h"

/* Structure to hold all of the different components describing
   an individual instruction.  */
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];
}
ip2k_insn;

const char comment_chars[]        = ";";
const char line_comment_chars[]   = "#";
const char line_separator_chars[] = ""; 
const char EXP_CHARS[]            = "eE";
const char FLT_CHARS[]            = "dD";

/* Flag to detect when switching to code section where insn alignment is
   implied.  */
static int force_code_align = 0;

/* Mach selected from command line.  */
static int ip2k_mach = 0;
static unsigned ip2k_mach_bitmask = 0;


static void
ip2k_elf_section_rtn (int i)
{
  obj_elf_section(i);

  if (force_code_align)
    {
      /* The s_align_ptwo function expects that we are just after a .align
	 directive and it will either try and read the align value or stop
	 if end of line so we must fake it out so it thinks we are at the
	 end of the line.  */
      char *old_input_line_pointer = input_line_pointer;
      input_line_pointer = "\n";
      s_align_ptwo (1);
      force_code_align = 0;
      /* Restore.  */
      input_line_pointer = old_input_line_pointer;
    }
}

static void
ip2k_elf_section_text (int i)
{
  char *old_input_line_pointer;
  obj_elf_text(i);

  /* the s_align_ptwo function expects that we are just after a .align
     directive and it will either try and read the align value or stop if
     end of line so we must fake it out so it thinks we are at the end of
     the line.  */
  old_input_line_pointer = input_line_pointer;
  input_line_pointer = "\n";
  s_align_ptwo (1);
  force_code_align = 0;
  /* Restore.  */
  input_line_pointer = old_input_line_pointer;
}

/* The target specific pseudo-ops which we support.  */
const pseudo_typeS md_pseudo_table[] =
{
    { "text",   ip2k_elf_section_text,  0 },
    { "sect",   ip2k_elf_section_rtn,   0 },
    { NULL, 	NULL,			0 }
};

\f

enum options
{
  OPTION_CPU_IP2022 = OPTION_MD_BASE,
  OPTION_CPU_IP2022EXT
};

struct option md_longopts[] = 
{
  { "mip2022",     no_argument, NULL, OPTION_CPU_IP2022 },
  { "mip2022ext",  no_argument, NULL, OPTION_CPU_IP2022EXT },
  { NULL,           no_argument, NULL, 0 },
};
size_t md_longopts_size = sizeof (md_longopts);

const char * md_shortopts = "";

int
md_parse_option (int c ATTRIBUTE_UNUSED, char * arg ATTRIBUTE_UNUSED)
{
  switch (c)
    {
    case OPTION_CPU_IP2022:
      ip2k_mach = bfd_mach_ip2022;
      ip2k_mach_bitmask = 1 << MACH_IP2022;
      break;

    case OPTION_CPU_IP2022EXT:
      ip2k_mach = bfd_mach_ip2022ext;
      ip2k_mach_bitmask = 1 << MACH_IP2022EXT;
      break;

    default:
      return 0;
    }

  return 1;
}

void
md_show_usage (FILE * stream)
{
  fprintf (stream, _("IP2K specific command line options:\n"));
  fprintf (stream, _("  -mip2022               restrict to IP2022 insns \n"));
  fprintf (stream, _("  -mip2022ext            permit extended IP2022 insn\n"));
}

\f
void
md_begin (void)
{
  /* Initialize the `cgen' interface.  */
  
  /* Set the machine number and endian.  */
  gas_cgen_cpu_desc = ip2k_cgen_cpu_open (CGEN_CPU_OPEN_MACHS,
					  ip2k_mach_bitmask,
					  CGEN_CPU_OPEN_ENDIAN,
					  CGEN_ENDIAN_BIG,
					  CGEN_CPU_OPEN_END);
  ip2k_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);

  /* Set the machine type.  */
  bfd_default_set_arch_mach (stdoutput, bfd_arch_ip2k, ip2k_mach);
}


void
md_assemble (char * str)
{
  ip2k_insn insn;
  char * errmsg;

  /* Initialize GAS's cgen interface for a new instruction.  */
  gas_cgen_init_parse ();

  insn.insn = ip2k_cgen_assemble_insn
      (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);

  if (!insn.insn)
    {
      as_bad ("%s", errmsg);
      return;
    }

  /* Check for special relocation required by SKIP instructions.  */
  if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_SKIPA))
    /* Unconditional skip has a 1-bit relocation of the current pc, so
       that we emit either sb pcl.0 or snb pcl.0 depending on whether
       the PCL (pc + 2) >> 1 is odd or even.  */
    {
      enum cgen_parse_operand_result result_type;
      bfd_vma value;
      const char *curpc_plus_2 = ".+2";
      const char *err;

      err = cgen_parse_address (gas_cgen_cpu_desc, & curpc_plus_2,
				IP2K_OPERAND_ADDR16CJP,
				BFD_RELOC_IP2K_PC_SKIP,
				& result_type, & value);
      if (err)
	{
	  as_bad ("%s", err);
	  return;
	}
    }

  /* Doesn't really matter what we pass for RELAX_P here.  */
  gas_cgen_finish_insn (insn.insn, insn.buffer,
			CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
}

valueT
md_section_align (segT segment, valueT size)
{
  int align = bfd_get_section_alignment (stdoutput, segment);

  return ((size + (1 << align) - 1) & (-1 << align));
}


symbolS *
md_undefined_symbol (char * name ATTRIBUTE_UNUSED)
{
    return 0;
}
\f
int
md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED,
			       segT    segment ATTRIBUTE_UNUSED)
{
  as_fatal (_("md_estimate_size_before_relax\n"));
  return 1;
} 


/* *fragP has been relaxed to its final size, and now needs to have
   the bytes inside it modified to conform to the new size.

   Called after relaxation is finished.
   fragP->fr_type == rs_machine_dependent.
   fragP->fr_subtype is the subtype of what the address relaxed to.  */

void
md_convert_frag (bfd   * abfd  ATTRIBUTE_UNUSED,
		 segT    sec   ATTRIBUTE_UNUSED,
		 fragS * fragP ATTRIBUTE_UNUSED)
{
}

\f
/* Functions concerning relocs.  */

long
md_pcrel_from (fixS *fixP)
{
  as_fatal (_("md_pcrel_from\n"));

  /* Return the address of the delay slot. */
  return fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address;
}


/* 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)
{
  bfd_reloc_code_real_type result;

  result = BFD_RELOC_NONE;

  switch (operand->type)
    {
    case IP2K_OPERAND_FR:
    case IP2K_OPERAND_ADDR16L:
    case IP2K_OPERAND_ADDR16H:
    case IP2K_OPERAND_LIT8:
      /* These may have been processed at parse time.  */
      if (fixP->fx_cgen.opinfo != 0)
	result = fixP->fx_cgen.opinfo;
      fixP->fx_no_overflow = 1;
      break;

    case IP2K_OPERAND_ADDR16CJP:
      result = fixP->fx_cgen.opinfo;
      if (result == 0 || result == BFD_RELOC_NONE)
	result = BFD_RELOC_IP2K_ADDR16CJP;
      fixP->fx_no_overflow = 1;
      break;

    case IP2K_OPERAND_ADDR16P:
      result = BFD_RELOC_IP2K_PAGE3;
      fixP->fx_no_overflow = 1;
      break;

    default:
      result = BFD_RELOC_NONE;
      break;
    }

  return result;
}


/* Write a value out to the object file, using the appropriate endianness.  */

void
md_number_to_chars (char * buf, valueT val, int n)
{
  number_to_chars_bigendian (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.  */

/* Equal to MAX_PRECISION in atof-ieee.c  */
#define MAX_LITTLENUMS 6

char *
md_atof (int type, char * litP, int *  sizeP)
{
  int              prec;
  LITTLENUM_TYPE   words [MAX_LITTLENUMS];
  LITTLENUM_TYPE  *wordP;
  char *           t;

  switch (type)
    {
    case 'f':
    case 'F':
    case 's':
    case 'S':
      prec = 2;
      break;

    case 'd':
    case 'D':
    case 'r':
    case 'R':
      prec = 4;
      break;

   /* FIXME: Some targets allow other format chars for bigger sizes here.  */

    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);

  /* This loops outputs the LITTLENUMs in REVERSE order; in accord with
     the ip2k endianness.  */
  for (wordP = words; prec--;)
    {
      md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE));
      litP += sizeof (LITTLENUM_TYPE);
    }
     
  return 0;
}


/* See whether we need to force a relocation into the output file.
   Force most of them, since the linker's bfd relocation engine
   understands range limits better than gas' cgen fixup engine.
   Consider the case of a fixup intermediate value being larger than
   the instruction it will be eventually encoded within.  */

int
ip2k_force_relocation (fixS * fix)
{
  switch (fix->fx_r_type)
    {
    case BFD_RELOC_IP2K_FR9:
    case BFD_RELOC_IP2K_FR_OFFSET:
    case BFD_RELOC_IP2K_BANK:
    case BFD_RELOC_IP2K_ADDR16CJP:
    case BFD_RELOC_IP2K_PAGE3:
    case BFD_RELOC_IP2K_LO8DATA:
    case BFD_RELOC_IP2K_HI8DATA:
    case BFD_RELOC_IP2K_EX8DATA:
    case BFD_RELOC_IP2K_LO8INSN:
    case BFD_RELOC_IP2K_HI8INSN:
    case BFD_RELOC_IP2K_PC_SKIP:
    case BFD_RELOC_IP2K_TEXT:
      return 1;

    case BFD_RELOC_16:
      if (fix->fx_subsy && S_IS_DEFINED (fix->fx_subsy)
	  && fix->fx_addsy && S_IS_DEFINED (fix->fx_addsy)
	  && (S_GET_SEGMENT (fix->fx_addsy)->flags & SEC_CODE))
	{
	  fix->fx_r_type = BFD_RELOC_IP2K_TEXT;
	  return 0;
	}
      break;

    default:
      break;
    }

  return generic_force_reloc (fix);
}

void
ip2k_apply_fix (fixS *fixP, valueT *valueP, segT seg)
{
  if (fixP->fx_r_type == BFD_RELOC_IP2K_TEXT
      && ! fixP->fx_addsy
      && ! fixP->fx_subsy)
    {
      *valueP = ((int)(* valueP)) / 2;
      fixP->fx_r_type = BFD_RELOC_16;
    }
  else if (fixP->fx_r_type == BFD_RELOC_UNUSED + IP2K_OPERAND_FR)
    {
      /* Must be careful when we are fixing up an FR.  We could be
	 fixing up an offset to (SP) or (DP) in which case we don't
	 want to step on the top 2 bits of the FR operand.  The
	 gas_cgen_md_apply_fix doesn't know any better and overwrites
	 the entire operand.  We counter this by adding the bits
	 to the new value.  */
      char *where = fixP->fx_frag->fr_literal + fixP->fx_where;

      /* Canonical name, since used a lot.  */
      CGEN_CPU_DESC cd = gas_cgen_cpu_desc;
      CGEN_INSN_INT insn_value
	= cgen_get_insn_value (cd, (unsigned char *) where,
			       CGEN_INSN_BITSIZE (fixP->fx_cgen.insn));
      /* Preserve (DP) or (SP) specification.  */
      *valueP += (insn_value & 0x180);
    }

  gas_cgen_md_apply_fix (fixP, valueP, seg);
}

int
ip2k_elf_section_flags (int flags,
			int attr ATTRIBUTE_UNUSED,
			int type ATTRIBUTE_UNUSED)
{
  /* This is used to detect when the section changes to an executable section.
     This function is called by the elf section processing.  When we note an
     executable section specifier we set an internal flag to denote when
     word alignment should be forced.  */
  if (flags & SEC_CODE)
    force_code_align = 1;
 
  return flags;
}
Commit	Line	Data
a40cbfa3	1	/* tc-ip2k.c -- Assembler for the Scenix IP2xxx.
ebd1c875	2	Copyright (C) 2000, 2002, 2003, 2005, 2006 Free Software Foundation.
a40cbfa3 NC	3
	4	This file is part of GAS, the GNU Assembler.
	5
	6	GAS is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2, or (at your option)
	9	any later version.
	10
	11	GAS is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with GAS; see the file COPYING. If not, write to
4b4da160 NC	18	the Free Software Foundation, 51 Franklin Street - Fifth Floor,
4b4da160 NC	19	Boston, MA 02110-1301, USA. */
a40cbfa3	20
a40cbfa3	21	#include "as.h"
a40cbfa3 NC	22	#include "subsegs.h"
	23	#include "symcat.h"
	24	#include "opcodes/ip2k-desc.h"
	25	#include "opcodes/ip2k-opc.h"
	26	#include "cgen.h"
	27	#include "elf/common.h"
	28	#include "elf/ip2k.h"
	29	#include "libbfd.h"
	30
	31	/* Structure to hold all of the different components describing
	32	an individual instruction. */
	33	typedef struct
	34	{
	35	const CGEN_INSN * insn;
	36	const CGEN_INSN * orig_insn;
	37	CGEN_FIELDS fields;
	38	#if CGEN_INT_INSN_P
	39	CGEN_INSN_INT buffer [1];
	40	#define INSN_VALUE(buf) (*(buf))
	41	#else
	42	unsigned char buffer [CGEN_MAX_INSN_SIZE];
	43	#define INSN_VALUE(buf) (buf)
	44	#endif
	45	char * addr;
	46	fragS * frag;
	47	int num_fixups;
	48	fixS * fixups [GAS_CGEN_MAX_FIXUPS];
	49	int indices [MAX_OPERAND_INSTANCES];
	50	}
	51	ip2k_insn;
	52
	53	const char comment_chars[] = ";";
	54	const char line_comment_chars[] = "#";
	55	const char line_separator_chars[] = "";
	56	const char EXP_CHARS[] = "eE";
	57	const char FLT_CHARS[] = "dD";
	58
ea1562b3 NC	59	/* Flag to detect when switching to code section where insn alignment is
	60	implied. */
	61	static int force_code_align = 0;
	62
	63	/* Mach selected from command line. */
	64	static int ip2k_mach = 0;
	65	static unsigned ip2k_mach_bitmask = 0;
	66
	67
	68	static void
	69	ip2k_elf_section_rtn (int i)
	70	{
	71	obj_elf_section(i);
	72
	73	if (force_code_align)
	74	{
	75	/* The s_align_ptwo function expects that we are just after a .align
	76	directive and it will either try and read the align value or stop
	77	if end of line so we must fake it out so it thinks we are at the
	78	end of the line. */
	79	char *old_input_line_pointer = input_line_pointer;
	80	input_line_pointer = "\n";
	81	s_align_ptwo (1);
	82	force_code_align = 0;
	83	/* Restore. */
	84	input_line_pointer = old_input_line_pointer;
	85	}
	86	}
	87
	88	static void
	89	ip2k_elf_section_text (int i)
	90	{
	91	char *old_input_line_pointer;
	92	obj_elf_text(i);
	93
	94	/* the s_align_ptwo function expects that we are just after a .align
	95	directive and it will either try and read the align value or stop if
	96	end of line so we must fake it out so it thinks we are at the end of
	97	the line. */
	98	old_input_line_pointer = input_line_pointer;
	99	input_line_pointer = "\n";
	100	s_align_ptwo (1);
	101	force_code_align = 0;
	102	/* Restore. */
	103	input_line_pointer = old_input_line_pointer;
	104	}
a40cbfa3 NC	105
	106	/* The target specific pseudo-ops which we support. */
	107	const pseudo_typeS md_pseudo_table[] =
	108	{
a40cbfa3 NC	109	{ "text", ip2k_elf_section_text, 0 },
	110	{ "sect", ip2k_elf_section_rtn, 0 },
	111	{ NULL, NULL, 0 }
	112	};
	113
	114	\f
	115
ea1562b3 NC	116	enum options
	117	{
	118	OPTION_CPU_IP2022 = OPTION_MD_BASE,
	119	OPTION_CPU_IP2022EXT
	120	};
a40cbfa3 NC	121
	122	struct option md_longopts[] =
	123	{
	124	{ "mip2022", no_argument, NULL, OPTION_CPU_IP2022 },
	125	{ "mip2022ext", no_argument, NULL, OPTION_CPU_IP2022EXT },
	126	{ NULL, no_argument, NULL, 0 },
	127	};
	128	size_t md_longopts_size = sizeof (md_longopts);
	129
	130	const char * md_shortopts = "";
	131
a40cbfa3	132	int
ea1562b3	133	md_parse_option (int c ATTRIBUTE_UNUSED, char * arg ATTRIBUTE_UNUSED)
a40cbfa3 NC	134	{
	135	switch (c)
	136	{
	137	case OPTION_CPU_IP2022:
	138	ip2k_mach = bfd_mach_ip2022;
	139	ip2k_mach_bitmask = 1 << MACH_IP2022;
	140	break;
	141
	142	case OPTION_CPU_IP2022EXT:
	143	ip2k_mach = bfd_mach_ip2022ext;
	144	ip2k_mach_bitmask = 1 << MACH_IP2022EXT;
	145	break;
	146
	147	default:
	148	return 0;
	149	}
	150
	151	return 1;
	152	}
	153
a40cbfa3	154	void
ea1562b3	155	md_show_usage (FILE * stream)
a40cbfa3 NC	156	{
	157	fprintf (stream, _("IP2K specific command line options:\n"));
	158	fprintf (stream, _(" -mip2022 restrict to IP2022 insns \n"));
	159	fprintf (stream, _(" -mip2022ext permit extended IP2022 insn\n"));
	160	}
	161
	162	\f
	163	void
ea1562b3	164	md_begin (void)
a40cbfa3 NC	165	{
	166	/* Initialize the `cgen' interface. */
	167
	168	/* Set the machine number and endian. */
	169	gas_cgen_cpu_desc = ip2k_cgen_cpu_open (CGEN_CPU_OPEN_MACHS,
	170	ip2k_mach_bitmask,
	171	CGEN_CPU_OPEN_ENDIAN,
	172	CGEN_ENDIAN_BIG,
	173	CGEN_CPU_OPEN_END);
	174	ip2k_cgen_init_asm (gas_cgen_cpu_desc);
	175
	176	/* This is a callback from cgen to gas to parse operands. */
	177	cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
	178
	179	/* Set the machine type. */
	180	bfd_default_set_arch_mach (stdoutput, bfd_arch_ip2k, ip2k_mach);
	181	}
	182
	183
	184	void
ea1562b3	185	md_assemble (char * str)
a40cbfa3 NC	186	{
	187	ip2k_insn insn;
	188	char * errmsg;
	189
	190	/* Initialize GAS's cgen interface for a new instruction. */
	191	gas_cgen_init_parse ();
	192
	193	insn.insn = ip2k_cgen_assemble_insn
	194	(gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
	195
	196	if (!insn.insn)
	197	{
	198	as_bad ("%s", errmsg);
	199	return;
	200	}
	201
	202	/* Check for special relocation required by SKIP instructions. */
	203	if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_SKIPA))
	204	/* Unconditional skip has a 1-bit relocation of the current pc, so
	205	that we emit either sb pcl.0 or snb pcl.0 depending on whether
	206	the PCL (pc + 2) >> 1 is odd or even. */
	207	{
	208	enum cgen_parse_operand_result result_type;
2132e3a3	209	bfd_vma value;
a40cbfa3	210	const char *curpc_plus_2 = ".+2";
64384dfd	211	const char *err;
a40cbfa3	212
64384dfd AM	213	err = cgen_parse_address (gas_cgen_cpu_desc, & curpc_plus_2,
	214	IP2K_OPERAND_ADDR16CJP,
	215	BFD_RELOC_IP2K_PC_SKIP,
	216	& result_type, & value);
	217	if (err)
a40cbfa3	218	{
64384dfd	219	as_bad ("%s", err);
a40cbfa3 NC	220	return;
	221	}
	222	}
	223
	224	/* Doesn't really matter what we pass for RELAX_P here. */
	225	gas_cgen_finish_insn (insn.insn, insn.buffer,
	226	CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
	227	}
	228
	229	valueT
ea1562b3	230	md_section_align (segT segment, valueT size)
a40cbfa3 NC	231	{
	232	int align = bfd_get_section_alignment (stdoutput, segment);
	233
	234	return ((size + (1 << align) - 1) & (-1 << align));
	235	}
	236
	237
	238	symbolS *
ea1562b3	239	md_undefined_symbol (char * name ATTRIBUTE_UNUSED)
a40cbfa3 NC	240	{
	241	return 0;
	242	}
	243	\f
	244	int
ea1562b3 NC	245	md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED,
ea1562b3 NC	246	segT segment ATTRIBUTE_UNUSED)
a40cbfa3 NC	247	{
	248	as_fatal (_("md_estimate_size_before_relax\n"));
	249	return 1;
	250	}
	251
	252
	253	/* *fragP has been relaxed to its final size, and now needs to have
	254	the bytes inside it modified to conform to the new size.
	255
	256	Called after relaxation is finished.
	257	fragP->fr_type == rs_machine_dependent.
	258	fragP->fr_subtype is the subtype of what the address relaxed to. */
	259
	260	void
ea1562b3 NC	261	md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED,
	262	segT sec ATTRIBUTE_UNUSED,
	263	fragS * fragP ATTRIBUTE_UNUSED)
a40cbfa3 NC	264	{
	265	}
	266
	267	\f
	268	/* Functions concerning relocs. */
	269
	270	long
ea1562b3	271	md_pcrel_from (fixS *fixP)
a40cbfa3 NC	272	{
	273	as_fatal (_("md_pcrel_from\n"));
	274
	275	/* Return the address of the delay slot. */
	276	return fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address;
	277	}
	278
	279
	280	/* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
	281	Returns BFD_RELOC_NONE if no reloc type can be found.
	282	FIXP may be modified if desired. /
	283
	284	bfd_reloc_code_real_type
ea1562b3 NC	285	md_cgen_lookup_reloc (const CGEN_INSN * insn ATTRIBUTE_UNUSED,
	286	const CGEN_OPERAND * operand,
	287	fixS * fixP ATTRIBUTE_UNUSED)
a40cbfa3 NC	288	{
	289	bfd_reloc_code_real_type result;
	290
	291	result = BFD_RELOC_NONE;
	292
	293	switch (operand->type)
	294	{
	295	case IP2K_OPERAND_FR:
	296	case IP2K_OPERAND_ADDR16L:
	297	case IP2K_OPERAND_ADDR16H:
	298	case IP2K_OPERAND_LIT8:
	299	/* These may have been processed at parse time. */
	300	if (fixP->fx_cgen.opinfo != 0)
	301	result = fixP->fx_cgen.opinfo;
	302	fixP->fx_no_overflow = 1;
	303	break;
	304
	305	case IP2K_OPERAND_ADDR16CJP:
	306	result = fixP->fx_cgen.opinfo;
	307	if (result == 0 \|\| result == BFD_RELOC_NONE)
	308	result = BFD_RELOC_IP2K_ADDR16CJP;
	309	fixP->fx_no_overflow = 1;
	310	break;
	311
	312	case IP2K_OPERAND_ADDR16P:
	313	result = BFD_RELOC_IP2K_PAGE3;
	314	fixP->fx_no_overflow = 1;
	315	break;
	316
	317	default:
	318	result = BFD_RELOC_NONE;
	319	break;
	320	}
	321
	322	return result;
	323	}
	324
	325
	326	/* Write a value out to the object file, using the appropriate endianness. */
	327
	328	void
ea1562b3	329	md_number_to_chars (char * buf, valueT val, int n)
a40cbfa3 NC	330	{
	331	number_to_chars_bigendian (buf, val, n);
	332	}
	333
	334	/* Turn a string in input_line_pointer into a floating point constant of type
	335	type, and store the appropriate bytes in *litP. The number of LITTLENUMS
	336	emitted is stored in *sizeP . An error message is returned, or NULL on
	337	OK. */
	338
	339	/* Equal to MAX_PRECISION in atof-ieee.c */
	340	#define MAX_LITTLENUMS 6
	341
	342	char *
ea1562b3	343	md_atof (int type, char * litP, int * sizeP)
a40cbfa3 NC	344	{
	345	int prec;
	346	LITTLENUM_TYPE words [MAX_LITTLENUMS];
	347	LITTLENUM_TYPE *wordP;
	348	char * t;
a40cbfa3 NC	349
	350	switch (type)
	351	{
	352	case 'f':
	353	case 'F':
	354	case 's':
	355	case 'S':
	356	prec = 2;
	357	break;
	358
	359	case 'd':
	360	case 'D':
	361	case 'r':
	362	case 'R':
	363	prec = 4;
	364	break;
	365
	366	/* FIXME: Some targets allow other format chars for bigger sizes here. */
	367
	368	default:
	369	* sizeP = 0;
	370	return _("Bad call to md_atof()");
	371	}
	372
	373	t = atof_ieee (input_line_pointer, type, words);
	374	if (t)
	375	input_line_pointer = t;
	376	* sizeP = prec * sizeof (LITTLENUM_TYPE);
	377
	378	/* This loops outputs the LITTLENUMs in REVERSE order; in accord with
	379	the ip2k endianness. */
	380	for (wordP = words; prec--;)
	381	{
	382	md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE));
	383	litP += sizeof (LITTLENUM_TYPE);
	384	}
	385
	386	return 0;
	387	}
	388
	389
	390	/* See whether we need to force a relocation into the output file.
	391	Force most of them, since the linker's bfd relocation engine
	392	understands range limits better than gas' cgen fixup engine.
	393	Consider the case of a fixup intermediate value being larger than
	394	the instruction it will be eventually encoded within. */
	395
	396	int
ea1562b3	397	ip2k_force_relocation (fixS * fix)
a40cbfa3 NC	398	{
	399	switch (fix->fx_r_type)
	400	{
a40cbfa3 NC	401	case BFD_RELOC_IP2K_FR9:
	402	case BFD_RELOC_IP2K_FR_OFFSET:
	403	case BFD_RELOC_IP2K_BANK:
	404	case BFD_RELOC_IP2K_ADDR16CJP:
	405	case BFD_RELOC_IP2K_PAGE3:
	406	case BFD_RELOC_IP2K_LO8DATA:
	407	case BFD_RELOC_IP2K_HI8DATA:
	408	case BFD_RELOC_IP2K_EX8DATA:
	409	case BFD_RELOC_IP2K_LO8INSN:
	410	case BFD_RELOC_IP2K_HI8INSN:
	411	case BFD_RELOC_IP2K_PC_SKIP:
	412	case BFD_RELOC_IP2K_TEXT:
	413	return 1;
	414
	415	case BFD_RELOC_16:
a161fe53	416	if (fix->fx_subsy && S_IS_DEFINED (fix->fx_subsy)
a40cbfa3 NC	417	&& fix->fx_addsy && S_IS_DEFINED (fix->fx_addsy)
	418	&& (S_GET_SEGMENT (fix->fx_addsy)->flags & SEC_CODE))
	419	{
	420	fix->fx_r_type = BFD_RELOC_IP2K_TEXT;
	421	return 0;
	422	}
a161fe53	423	break;
a40cbfa3 NC	424
a40cbfa3 NC	425	default:
a161fe53	426	break;
a40cbfa3	427	}
a161fe53	428
ae6063d4	429	return generic_force_reloc (fix);
a40cbfa3 NC	430	}
	431
	432	void
55cf6793	433	ip2k_apply_fix (fixS fixP, valueT valueP, segT seg)
a40cbfa3 NC	434	{
	435	if (fixP->fx_r_type == BFD_RELOC_IP2K_TEXT
	436	&& ! fixP->fx_addsy
	437	&& ! fixP->fx_subsy)
	438	{
ea1562b3	439	valueP = ((int)( valueP)) / 2;
a40cbfa3 NC	440	fixP->fx_r_type = BFD_RELOC_16;
	441	}
	442	else if (fixP->fx_r_type == BFD_RELOC_UNUSED + IP2K_OPERAND_FR)
	443	{
	444	/* Must be careful when we are fixing up an FR. We could be
	445	fixing up an offset to (SP) or (DP) in which case we don't
	446	want to step on the top 2 bits of the FR operand. The
55cf6793	447	gas_cgen_md_apply_fix doesn't know any better and overwrites
a40cbfa3 NC	448	the entire operand. We counter this by adding the bits
	449	to the new value. */
	450	char *where = fixP->fx_frag->fr_literal + fixP->fx_where;
	451
	452	/* Canonical name, since used a lot. */
	453	CGEN_CPU_DESC cd = gas_cgen_cpu_desc;
	454	CGEN_INSN_INT insn_value
2132e3a3	455	= cgen_get_insn_value (cd, (unsigned char *) where,
a40cbfa3 NC	456	CGEN_INSN_BITSIZE (fixP->fx_cgen.insn));
	457	/* Preserve (DP) or (SP) specification. */
	458	*valueP += (insn_value & 0x180);
	459	}
	460
55cf6793	461	gas_cgen_md_apply_fix (fixP, valueP, seg);
a40cbfa3 NC	462	}
	463
	464	int
ea1562b3 NC	465	ip2k_elf_section_flags (int flags,
	466	int attr ATTRIBUTE_UNUSED,
	467	int type ATTRIBUTE_UNUSED)
a40cbfa3 NC	468	{
	469	/* This is used to detect when the section changes to an executable section.
	470	This function is called by the elf section processing. When we note an
	471	executable section specifier we set an internal flag to denote when
	472	word alignment should be forced. */
	473	if (flags & SEC_CODE)
	474	force_code_align = 1;
	475
	476	return flags;
	477	}
	478