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

/* tc-ip2k.c -- Assembler for the Scenix IP2xxx.
   Copyright (C) 2000, 2002 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, 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <stdio.h>
#include <ctype.h>

#include "as.h"
#include "dwarf2dbg.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";

static void ip2k_elf_section_text (int);
static void ip2k_elf_section_rtn (int);

/* The target specific pseudo-ops which we support.  */
const pseudo_typeS md_pseudo_table[] =
{
    { "file",	dwarf2_directive_file,	0 },
    { "loc",	dwarf2_directive_loc,	0 },
    { "text",   ip2k_elf_section_text,  0 },
    { "sect",   ip2k_elf_section_rtn,   0 },
    { NULL, 	NULL,			0 }
};

\f

#define OPTION_CPU_IP2022    (OPTION_MD_BASE)
#define OPTION_CPU_IP2022EXT (OPTION_MD_BASE+1)

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 = "";

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

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

int
md_parse_option (c, arg)
    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 (stream)
    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 ()
{
  /* 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 (str)
     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;
      long value;
      const char *curpc_plus_2 = ".+2";

      errmsg = cgen_parse_address (gas_cgen_cpu_desc, & curpc_plus_2,
				   IP2K_OPERAND_ADDR16CJP,
				   BFD_RELOC_IP2K_PC_SKIP,
				   & result_type, & value);
      if (errmsg)
	{
	  as_bad ("%s", errmsg);
	  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 (segment, size)
     segT   segment;
     valueT size;
{
  int align = bfd_get_section_alignment (stdoutput, segment);

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


symbolS *
md_undefined_symbol (name)
    char * name ATTRIBUTE_UNUSED;
{
    return 0;
}
\f
int
md_estimate_size_before_relax (fragP, segment)
     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 (abfd, sec, fragP)
    bfd   * abfd  ATTRIBUTE_UNUSED;
    segT    sec   ATTRIBUTE_UNUSED;
    fragS * fragP ATTRIBUTE_UNUSED;
{
}

\f
/* Functions concerning relocs.  */

long
md_pcrel_from (fixP)
     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 (insn, operand, fixP)
     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 (buf, val, n)
     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 (type, litP, sizeP)
     char   type;
     char * litP;
     int *  sizeP;
{
  int              prec;
  LITTLENUM_TYPE   words [MAX_LITTLENUMS];
  LITTLENUM_TYPE  *wordP;
  char *           t;
  char *           atof_ieee PARAMS ((char *, int, LITTLENUM_TYPE *));

  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 (fix)
     fixS * fix;
{
  switch (fix->fx_r_type)
    {
      /* (No C++ support in ip2k.  */
      /* case BFD_RELOC_VTABLE_INHERIT: */
      /* case BFD_RELOC_VTABLE_ENTRY: */

    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;
	}
      return 0;

    default:
      return 0;
    }
}

void
ip2k_apply_fix3 (fixP, valueP, seg)
     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_fix3 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, where,
			       CGEN_INSN_BITSIZE (fixP->fx_cgen.insn));
      /* Preserve (DP) or (SP) specification.  */
      *valueP += (insn_value & 0x180);
    }

  gas_cgen_md_apply_fix3 (fixP, valueP, seg);
}

int
ip2k_elf_section_flags (flags, attr, type)
     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;
}

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;
}
Commit	Line	Data
a40cbfa3 NC	1	/* tc-ip2k.c -- Assembler for the Scenix IP2xxx.
	2	Copyright (C) 2000, 2002 Free Software Foundation.
	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
	18	the Free Software Foundation, 59 Temple Place - Suite 330,
	19	Boston, MA 02111-1307, USA. */
	20
	21	#include <stdio.h>
	22	#include <ctype.h>
	23
	24	#include "as.h"
	25	#include "dwarf2dbg.h"
	26	#include "subsegs.h"
	27	#include "symcat.h"
	28	#include "opcodes/ip2k-desc.h"
	29	#include "opcodes/ip2k-opc.h"
	30	#include "cgen.h"
	31	#include "elf/common.h"
	32	#include "elf/ip2k.h"
	33	#include "libbfd.h"
	34
	35	/* Structure to hold all of the different components describing
	36	an individual instruction. */
	37	typedef struct
	38	{
	39	const CGEN_INSN * insn;
	40	const CGEN_INSN * orig_insn;
	41	CGEN_FIELDS fields;
	42	#if CGEN_INT_INSN_P
	43	CGEN_INSN_INT buffer [1];
	44	#define INSN_VALUE(buf) (*(buf))
	45	#else
	46	unsigned char buffer [CGEN_MAX_INSN_SIZE];
	47	#define INSN_VALUE(buf) (buf)
	48	#endif
	49	char * addr;
	50	fragS * frag;
	51	int num_fixups;
	52	fixS * fixups [GAS_CGEN_MAX_FIXUPS];
	53	int indices [MAX_OPERAND_INSTANCES];
	54	}
	55	ip2k_insn;
	56
	57	const char comment_chars[] = ";";
	58	const char line_comment_chars[] = "#";
	59	const char line_separator_chars[] = "";
	60	const char EXP_CHARS[] = "eE";
	61	const char FLT_CHARS[] = "dD";
	62
	63	static void ip2k_elf_section_text (int);
	64	static void ip2k_elf_section_rtn (int);
65
66	/* The target specific pseudo-ops which we support. */
67	const pseudo_typeS md_pseudo_table[] =
68	{
69	{ "file", dwarf2_directive_file, 0 },
70	{ "loc", dwarf2_directive_loc, 0 },
71	{ "text", ip2k_elf_section_text, 0 },
72	{ "sect", ip2k_elf_section_rtn, 0 },
73	{ NULL, NULL, 0 }
74	};
75
76	\f
77
78	#define OPTION_CPU_IP2022 (OPTION_MD_BASE)
79	#define OPTION_CPU_IP2022EXT (OPTION_MD_BASE+1)
80
81	struct option md_longopts[] =
82	{
83	{ "mip2022", no_argument, NULL, OPTION_CPU_IP2022 },
84	{ "mip2022ext", no_argument, NULL, OPTION_CPU_IP2022EXT },
85	{ NULL, no_argument, NULL, 0 },
86	};
87	size_t md_longopts_size = sizeof (md_longopts);
88
89	const char * md_shortopts = "";
90
91	/* Flag to detect when switching to code section where insn alignment is
92	implied. */
93	static int force_code_align = 0;
94
95	/* Mach selected from command line. */
96	int ip2k_mach = 0;
97	unsigned ip2k_mach_bitmask = 0;
98
99	int
100	md_parse_option (c, arg)
101	int c ATTRIBUTE_UNUSED;
102	char * arg ATTRIBUTE_UNUSED;
103	{
104	switch (c)
105	{
106	case OPTION_CPU_IP2022:
107	ip2k_mach = bfd_mach_ip2022;
108	ip2k_mach_bitmask = 1 << MACH_IP2022;
109	break;
110
111	case OPTION_CPU_IP2022EXT:
112	ip2k_mach = bfd_mach_ip2022ext;
113	ip2k_mach_bitmask = 1 << MACH_IP2022EXT;
114	break;
115
116	default:
117	return 0;
118	}
119
120	return 1;
121	}
122
123
124	void
125	md_show_usage (stream)
126	FILE * stream;
127	{
128	fprintf (stream, _("IP2K specific command line options:\n"));
129	fprintf (stream, _(" -mip2022 restrict to IP2022 insns \n"));
130	fprintf (stream, _(" -mip2022ext permit extended IP2022 insn\n"));
131	}
132
133	\f
134	void
135	md_begin ()
136	{
137	/* Initialize the `cgen' interface. */
138
139	/* Set the machine number and endian. */
140	gas_cgen_cpu_desc = ip2k_cgen_cpu_open (CGEN_CPU_OPEN_MACHS,
141	ip2k_mach_bitmask,
142	CGEN_CPU_OPEN_ENDIAN,
143	CGEN_ENDIAN_BIG,
144	CGEN_CPU_OPEN_END);
145	ip2k_cgen_init_asm (gas_cgen_cpu_desc);
146
147	/* This is a callback from cgen to gas to parse operands. */
148	cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
149
150	/* Set the machine type. */
151	bfd_default_set_arch_mach (stdoutput, bfd_arch_ip2k, ip2k_mach);
152	}
153
154
155	void
156	md_assemble (str)
157	char * str;
158	{
159	ip2k_insn insn;
160	char * errmsg;
161
162	/* Initialize GAS's cgen interface for a new instruction. */
163	gas_cgen_init_parse ();
164
165	insn.insn = ip2k_cgen_assemble_insn
166	(gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
167
168	if (!insn.insn)
169	{
170	as_bad ("%s", errmsg);
171	return;
172	}
173
174	/* Check for special relocation required by SKIP instructions. */
175	if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_SKIPA))
176	/* Unconditional skip has a 1-bit relocation of the current pc, so
177	that we emit either sb pcl.0 or snb pcl.0 depending on whether
178	the PCL (pc + 2) >> 1 is odd or even. */
179	{
180	enum cgen_parse_operand_result result_type;
181	long value;
182	const char *curpc_plus_2 = ".+2";
183
184	errmsg = cgen_parse_address (gas_cgen_cpu_desc, & curpc_plus_2,
185	IP2K_OPERAND_ADDR16CJP,
186	BFD_RELOC_IP2K_PC_SKIP,
187	& result_type, & value);
188	if (errmsg)
189	{
190	as_bad ("%s", errmsg);
191	return;
192	}
193	}
194
195	/* Doesn't really matter what we pass for RELAX_P here. */
196	gas_cgen_finish_insn (insn.insn, insn.buffer,
197	CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
198	}
199
200	valueT
201	md_section_align (segment, size)
202	segT segment;
203	valueT size;
204	{
205	int align = bfd_get_section_alignment (stdoutput, segment);
206
207	return ((size + (1 << align) - 1) & (-1 << align));
208	}
209
210
211	symbolS *
212	md_undefined_symbol (name)
213	char * name ATTRIBUTE_UNUSED;
214	{
215	return 0;
216	}
217	\f
218	int
219	md_estimate_size_before_relax (fragP, segment)
220	fragS * fragP ATTRIBUTE_UNUSED;
221	segT segment ATTRIBUTE_UNUSED;
222	{
223	as_fatal (_("md_estimate_size_before_relax\n"));
224	return 1;
225	}
226
227
228	/* *fragP has been relaxed to its final size, and now needs to have
229	the bytes inside it modified to conform to the new size.
230
231	Called after relaxation is finished.
232	fragP->fr_type == rs_machine_dependent.
233	fragP->fr_subtype is the subtype of what the address relaxed to. */
234
235	void
236	md_convert_frag (abfd, sec, fragP)
237	bfd * abfd ATTRIBUTE_UNUSED;
238	segT sec ATTRIBUTE_UNUSED;
239	fragS * fragP ATTRIBUTE_UNUSED;
240	{
241	}
242
243	\f
244	/* Functions concerning relocs. */
245
246	long
247	md_pcrel_from (fixP)
248	fixS *fixP;
249	{
250	as_fatal (_("md_pcrel_from\n"));
251
252	/* Return the address of the delay slot. */
253	return fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address;
254	}
255
256
257	/* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
258	Returns BFD_RELOC_NONE if no reloc type can be found.
259	FIXP may be modified if desired. /
260
261	bfd_reloc_code_real_type
262	md_cgen_lookup_reloc (insn, operand, fixP)
263	const CGEN_INSN * insn ATTRIBUTE_UNUSED;
264	const CGEN_OPERAND * operand;
265	fixS * fixP ATTRIBUTE_UNUSED;
266	{
267	bfd_reloc_code_real_type result;
268
269	result = BFD_RELOC_NONE;
270
271	switch (operand->type)
272	{
273	case IP2K_OPERAND_FR:
274	case IP2K_OPERAND_ADDR16L:
275	case IP2K_OPERAND_ADDR16H:
276	case IP2K_OPERAND_LIT8:
277	/* These may have been processed at parse time. */
278	if (fixP->fx_cgen.opinfo != 0)
279	result = fixP->fx_cgen.opinfo;
280	fixP->fx_no_overflow = 1;
281	break;
282
283	case IP2K_OPERAND_ADDR16CJP:
284	result = fixP->fx_cgen.opinfo;
285	if (result == 0 \|\| result == BFD_RELOC_NONE)
286	result = BFD_RELOC_IP2K_ADDR16CJP;
287	fixP->fx_no_overflow = 1;
288	break;
289
290	case IP2K_OPERAND_ADDR16P:
291	result = BFD_RELOC_IP2K_PAGE3;
292	fixP->fx_no_overflow = 1;
293	break;
294
295	default:
296	result = BFD_RELOC_NONE;
297	break;
298	}
299
300	return result;
301	}
302
303
304	/* Write a value out to the object file, using the appropriate endianness. */
305
306	void
307	md_number_to_chars (buf, val, n)
308	char * buf;
309	valueT val;
310	int n;
311	{
312	number_to_chars_bigendian (buf, val, n);
313	}
314
315	/* Turn a string in input_line_pointer into a floating point constant of type
316	type, and store the appropriate bytes in *litP. The number of LITTLENUMS
317	emitted is stored in *sizeP . An error message is returned, or NULL on
318	OK. */
319
320	/* Equal to MAX_PRECISION in atof-ieee.c */
321	#define MAX_LITTLENUMS 6
322
323	char *
324	md_atof (type, litP, sizeP)
325	char type;
326	char * litP;
327	int * sizeP;
328	{
329	int prec;
330	LITTLENUM_TYPE words [MAX_LITTLENUMS];
331	LITTLENUM_TYPE *wordP;
332	char * t;
333	char * atof_ieee PARAMS ((char , int, LITTLENUM_TYPE ));
334
335	switch (type)
336	{
337	case 'f':
338	case 'F':
339	case 's':
340	case 'S':
341	prec = 2;
342	break;
343
344	case 'd':
345	case 'D':
346	case 'r':
347	case 'R':
348	prec = 4;
349	break;
350
351	/* FIXME: Some targets allow other format chars for bigger sizes here. */
352
353	default:
354	* sizeP = 0;
355	return _("Bad call to md_atof()");
356	}
357
358	t = atof_ieee (input_line_pointer, type, words);
359	if (t)
360	input_line_pointer = t;
361	* sizeP = prec * sizeof (LITTLENUM_TYPE);
362
363	/* This loops outputs the LITTLENUMs in REVERSE order; in accord with
364	the ip2k endianness. */
365	for (wordP = words; prec--;)
366	{
367	md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE));
368	litP += sizeof (LITTLENUM_TYPE);
369	}
370
371	return 0;
372	}
373
374
375	/* See whether we need to force a relocation into the output file.
376	Force most of them, since the linker's bfd relocation engine
377	understands range limits better than gas' cgen fixup engine.
378	Consider the case of a fixup intermediate value being larger than
379	the instruction it will be eventually encoded within. */
380
381	int
382	ip2k_force_relocation (fix)
383	fixS * fix;
384	{
385	switch (fix->fx_r_type)
386	{
387	/* (No C++ support in ip2k. */
388	/* case BFD_RELOC_VTABLE_INHERIT: */
389	/* case BFD_RELOC_VTABLE_ENTRY: */
390
391	case BFD_RELOC_IP2K_FR9:
392	case BFD_RELOC_IP2K_FR_OFFSET:
393	case BFD_RELOC_IP2K_BANK:
394	case BFD_RELOC_IP2K_ADDR16CJP:
395	case BFD_RELOC_IP2K_PAGE3:
396	case BFD_RELOC_IP2K_LO8DATA:
397	case BFD_RELOC_IP2K_HI8DATA:
398	case BFD_RELOC_IP2K_EX8DATA:
399	case BFD_RELOC_IP2K_LO8INSN:
400	case BFD_RELOC_IP2K_HI8INSN:
401	case BFD_RELOC_IP2K_PC_SKIP:
402	case BFD_RELOC_IP2K_TEXT:
403	return 1;
404
405	case BFD_RELOC_16:
406	if (fix->fx_subsy && S_IS_DEFINED (fix->fx_subsy)
407	&& fix->fx_addsy && S_IS_DEFINED (fix->fx_addsy)
408	&& (S_GET_SEGMENT (fix->fx_addsy)->flags & SEC_CODE))
409	{
410	fix->fx_r_type = BFD_RELOC_IP2K_TEXT;
411	return 0;
412	}
413	return 0;
414
415	default:
416	return 0;
417	}
418	}
419
420	void
421	ip2k_apply_fix3 (fixP, valueP, seg)
422	fixS *fixP;
423	valueT *valueP;
424	segT seg;
425	{
426	if (fixP->fx_r_type == BFD_RELOC_IP2K_TEXT
427	&& ! fixP->fx_addsy
428	&& ! fixP->fx_subsy)
429	{
430	valueP = ((int)(valueP)) / 2;
431	fixP->fx_r_type = BFD_RELOC_16;
432	}
433	else if (fixP->fx_r_type == BFD_RELOC_UNUSED + IP2K_OPERAND_FR)
434	{
435	/* Must be careful when we are fixing up an FR. We could be
436	fixing up an offset to (SP) or (DP) in which case we don't
437	want to step on the top 2 bits of the FR operand. The
438	gas_cgen_md_apply_fix3 doesn't know any better and overwrites
439	the entire operand. We counter this by adding the bits
440	to the new value. */
441	char *where = fixP->fx_frag->fr_literal + fixP->fx_where;
442
443	/* Canonical name, since used a lot. */
444	CGEN_CPU_DESC cd = gas_cgen_cpu_desc;
445	CGEN_INSN_INT insn_value
446	= cgen_get_insn_value (cd, where,
447	CGEN_INSN_BITSIZE (fixP->fx_cgen.insn));
448	/* Preserve (DP) or (SP) specification. */
449	*valueP += (insn_value & 0x180);
450	}
451
452	gas_cgen_md_apply_fix3 (fixP, valueP, seg);
453	}
454
455	int
456	ip2k_elf_section_flags (flags, attr, type)
457	int flags;
458	int attr ATTRIBUTE_UNUSED;
459	int type ATTRIBUTE_UNUSED;
460	{
461	/* This is used to detect when the section changes to an executable section.
462	This function is called by the elf section processing. When we note an
463	executable section specifier we set an internal flag to denote when
464	word alignment should be forced. */
465	if (flags & SEC_CODE)
466	force_code_align = 1;
467
468	return flags;
469	}
470
471	static void
472	ip2k_elf_section_rtn (int i)
473	{
474	obj_elf_section(i);
475
476	if (force_code_align)
477	{
478	/* The s_align_ptwo function expects that we are just after a .align
479	directive and it will either try and read the align value or stop
480	if end of line so we must fake it out so it thinks we are at the
481	end of the line. */
482	char *old_input_line_pointer = input_line_pointer;
483	input_line_pointer = "\n";
484	s_align_ptwo (1);
485	force_code_align = 0;
486	/* Restore. */
487	input_line_pointer = old_input_line_pointer;
488	}
489	}
490
491	static void
492	ip2k_elf_section_text (int i)
493	{
494	char *old_input_line_pointer;
495	obj_elf_text(i);
496
497	/* the s_align_ptwo function expects that we are just after a .align
498	directive and it will either try and read the align value or stop if
499	end of line so we must fake it out so it thinks we are at the end of
500	the line. */
501	old_input_line_pointer = input_line_pointer;
502	input_line_pointer = "\n";
503	s_align_ptwo (1);
504	force_code_align = 0;
505	/* Restore. */
506	input_line_pointer = old_input_line_pointer;
507	}