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binutils-gdb/gas/config/tc-xc16x.c
Nick Clifton d70c5fc7c5 Add support for the Infineon XC16X.
2006-02-17 14:36:28 +00:00

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/* tc-xc16x.c -- Assembler for the Infineon XC16X.
Copyright 2006 Free Software Foundation, Inc.
Contributed by KPIT Cummins Infosystems
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 <stdio.h>
#include "as.h"
#include "safe-ctype.h"
#include "subsegs.h"
#include "symcat.h"
#include "opcodes/xc16x-desc.h"
#include "opcodes/xc16x-opc.h"
#include "cgen.h"
#include "bfd.h"
#include "dwarf2dbg.h"
#ifdef OBJ_ELF
#include "elf/xc16x.h"
#endif
/* 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];
}
xc16x_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";
#define XC16X_SHORTOPTS ""
const char * md_shortopts = XC16X_SHORTOPTS;
struct option md_longopts[] =
{
{NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof (md_longopts);
static void
xc16xlmode (int arg ATTRIBUTE_UNUSED)
{
if (stdoutput != NULL)
if (!bfd_set_arch_mach (stdoutput, bfd_arch_xc16x, bfd_mach_xc16xl))
as_warn (_("could not set architecture and machine"));
}
static void
xc16xsmode (int arg ATTRIBUTE_UNUSED)
{
if (!bfd_set_arch_mach (stdoutput, bfd_arch_xc16x, bfd_mach_xc16xs))
as_warn (_("could not set architecture and machine"));
}
static void
xc16xmode (int arg ATTRIBUTE_UNUSED)
{
if (!bfd_set_arch_mach (stdoutput, bfd_arch_xc16x, bfd_mach_xc16x))
as_warn (_("could not set architecture and machine"));
}
/* The target specific pseudo-ops which we support. */
const pseudo_typeS md_pseudo_table[] =
{
{ "word", cons, 2 },
{"xc16xl", xc16xlmode, 0},
{"xc16xs", xc16xsmode, 0},
{"xc16x", xc16xmode, 0},
{ NULL, NULL, 0 }
};
void
md_begin (void)
{
/* Initialize the `cgen' interface. */
/* Set the machine number and endian. */
gas_cgen_cpu_desc = xc16x_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
CGEN_CPU_OPEN_ENDIAN,
CGEN_ENDIAN_LITTLE,
CGEN_CPU_OPEN_END);
xc16x_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);
}
void
md_assemble (char *str)
{
xc16x_insn insn;
char *errmsg;
/* Initialize GAS's cgen interface for a new instruction. */
gas_cgen_init_parse ();
insn.insn = xc16x_cgen_assemble_insn
(gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
if (!insn.insn)
{
as_bad (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);
}
/* 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)
{
switch (operand->type)
{
case XC16X_OPERAND_REL:
fixP->fx_where += 1;
fixP->fx_pcrel = 1;
return BFD_RELOC_8_PCREL;
case XC16X_OPERAND_CADDR:
fixP->fx_where += 2;
return BFD_RELOC_16;
case XC16X_OPERAND_UIMM7:
fixP->fx_where += 1;
fixP->fx_pcrel = 1;
return BFD_RELOC_8_PCREL;
case XC16X_OPERAND_UIMM16:
case XC16X_OPERAND_MEMORY:
fixP->fx_where += 2;
return BFD_RELOC_16;
case XC16X_OPERAND_UPOF16:
fixP->fx_where += 2;
return BFD_RELOC_XC16X_POF;
case XC16X_OPERAND_UPAG16:
fixP->fx_where += 2;
return BFD_RELOC_XC16X_PAG;
case XC16X_OPERAND_USEG8:
fixP->fx_where += 1;
return BFD_RELOC_XC16X_SEG;
case XC16X_OPERAND_USEG16:
case XC16X_OPERAND_USOF16:
fixP->fx_where += 2;
return BFD_RELOC_XC16X_SOF;
default : /* avoid -Wall warning */
break;
}
fixP->fx_where += 2;
return BFD_RELOC_XC16X_SOF;
}
/* 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_littleendian (buf, val, n);
}
void
md_show_usage (FILE * stream)
{
fprintf (stream, _(" XC16X specific command line options:\n"));
}
int
md_parse_option (int c ATTRIBUTE_UNUSED,
char *arg ATTRIBUTE_UNUSED)
{
return 0;
}
/* 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 i;
int prec;
LITTLENUM_TYPE words[MAX_LITTLENUMS];
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);
for (i = prec - 1; i >= 0; i--)
{
md_number_to_chars (litP, (valueT) words[i],
sizeof (LITTLENUM_TYPE));
litP += sizeof (LITTLENUM_TYPE);
}
return 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 NULL;
}
int
md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,
segT segment_type ATTRIBUTE_UNUSED)
{
printf (_("call tomd_estimate_size_before_relax \n"));
abort ();
}
long
md_pcrel_from (fixS *fixP)
{
long temp_val;
temp_val=fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address;
return temp_val;
}
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
|| S_IS_EXTERNAL (fixP->fx_addsy)
|| S_IS_WEAK (fixP->fx_addsy)))
{
return 0;
}
return md_pcrel_from (fixP);
}
arelent *
tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp)
{
arelent *rel;
bfd_reloc_code_real_type r_type;
if (fixp->fx_addsy && fixp->fx_subsy)
{
if ((S_GET_SEGMENT (fixp->fx_addsy) != S_GET_SEGMENT (fixp->fx_subsy))
|| S_GET_SEGMENT (fixp->fx_addsy) == undefined_section)
{
as_bad_where (fixp->fx_file, fixp->fx_line,
"Difference of symbols in different sections is not supported");
return NULL;
}
}
rel = xmalloc (sizeof (arelent));
rel->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
*rel->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
rel->address = fixp->fx_frag->fr_address + fixp->fx_where;
rel->addend = fixp->fx_offset;
r_type = fixp->fx_r_type;
#define DEBUG 0
#if DEBUG
fprintf (stderr, "%s\n", bfd_get_reloc_code_name (r_type));
fflush(stderr);
#endif
rel->howto = bfd_reloc_type_lookup (stdoutput, r_type);
if (rel->howto == NULL)
{
as_bad_where (fixp->fx_file, fixp->fx_line,
_("Cannot represent relocation type %s"),
bfd_get_reloc_code_name (r_type));
return NULL;
}
return rel;
}
void
md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
{
if(!strstr (seg->name,".debug"))
{
if (*valP < 128)
*valP /= 2;
if (*valP>268435455)
{
*valP = *valP * (-1);
*valP /= 2;
*valP = 256 - (*valP);
}
}
gas_cgen_md_apply_fix (fixP, valP, seg);
return;
}
void
md_convert_frag (bfd *headers ATTRIBUTE_UNUSED,
segT seg ATTRIBUTE_UNUSED,
fragS *fragP ATTRIBUTE_UNUSED)
{
printf (_("call to md_convert_frag \n"));
abort ();
}
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