binutils-gdb/gas/config/tc-xstormy16.c
2002-01-15 11:58:45 +00:00

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/* tc-xstormy16.c -- Assembler for the Sanyo XSTORMY16.
Copyright (C) 2000, 2001, 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 "as.h"
#include "subsegs.h"
#include "symcat.h"
#include "opcodes/xstormy16-desc.h"
#include "opcodes/xstormy16-opc.h"
#include "cgen.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];
}
xstormy16_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 O_fptr_symbol (O_max + 1)
#define XSTORMY16_SHORTOPTS ""
const char * md_shortopts = XSTORMY16_SHORTOPTS;
struct option md_longopts[] =
{
{NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof (md_longopts);
int
md_parse_option (c, arg)
int c ATTRIBUTE_UNUSED;
char * arg ATTRIBUTE_UNUSED;
{
return 0;
}
void
md_show_usage (stream)
FILE * stream;
{
fprintf (stream, _(" XSTORMY16 specific command line options:\n"));
}
/* The target specific pseudo-ops which we support. */
const pseudo_typeS md_pseudo_table[] =
{
{ "word", cons, 4 },
{ NULL, NULL, 0 }
};
void
md_begin ()
{
/* Initialize the `cgen' interface. */
/* Set the machine number and endian. */
gas_cgen_cpu_desc = xstormy16_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
CGEN_CPU_OPEN_ENDIAN,
CGEN_ENDIAN_LITTLE,
CGEN_CPU_OPEN_END);
xstormy16_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 (str)
char * str;
{
xstormy16_insn insn;
char * errmsg;
/* Initialize GAS's cgen interface for a new instruction. */
gas_cgen_init_parse ();
insn.insn = xstormy16_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), 0, NULL);
}
void
md_operand (e)
expressionS * e;
{
if (*input_line_pointer != '@')
return;
if (strncmp (input_line_pointer+1, "fptr", 4) == 0)
{
input_line_pointer += 5;
SKIP_WHITESPACE ();
if (*input_line_pointer != '(')
{
as_bad ("Expected '('");
goto err;
}
input_line_pointer++;
expression (e);
if (*input_line_pointer != ')')
{
as_bad ("Missing ')'");
goto err;
}
input_line_pointer++;
if (e->X_op != O_symbol)
as_bad ("Not a symbolic expression");
else
e->X_op = O_fptr_symbol;
}
return;
err:
ignore_rest_of_line ();
}
/* Called while parsing data to create a fixup.
Create BFD_RELOC_XSTORMY16_FPTR16 relocations. */
void
xstormy16_cons_fix_new (f, where, nbytes, exp)
fragS *f;
int where;
int nbytes;
expressionS *exp;
{
bfd_reloc_code_real_type code;
fixS *fix;
if (exp->X_op == O_fptr_symbol)
{
if (nbytes != 2)
{
as_bad ("unsupported fptr fixup size %d", nbytes);
return;
}
exp->X_op = O_symbol;
code = BFD_RELOC_XSTORMY16_FPTR16;
}
else if (nbytes == 1)
code = BFD_RELOC_8;
else if (nbytes == 2)
code = BFD_RELOC_16;
else if (nbytes == 4)
code = BFD_RELOC_32;
else
{
as_bad ("unsupported fixup size %d", nbytes);
return;
}
fix = fix_new_exp (f, where, nbytes, exp, 0, code);
}
/* Called while parsing an instruction to create a fixup.
Create BFD_RELOC_XSTORMY16_FPTR16 relocations. */
fixS *
xstormy16_cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp)
fragS * frag;
int where;
const CGEN_INSN * insn;
int length;
const CGEN_OPERAND * operand;
int opinfo;
expressionS * exp;
{
fixS *fixP;
operatorT op = exp->X_op;
if (op == O_fptr_symbol)
exp->X_op = O_symbol;
fixP = gas_cgen_record_fixup_exp (frag, where, insn, length,
operand, opinfo, exp);
if (op == O_fptr_symbol)
{
if (operand->type != XSTORMY16_OPERAND_IMM16)
as_bad ("unsupported fptr fixup");
else
{
fixP->fx_r_type = BFD_RELOC_XSTORMY16_FPTR16;
fixP->fx_where += 2;
}
}
return fixP;
}
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;
}
/* Return an initial guess of the length by which a fragment must grow to
hold a branch to reach its destination.
Also updates fr_type/fr_subtype as necessary.
Called just before doing relaxation.
Any symbol that is now undefined will not become defined.
The guess for fr_var is ACTUALLY the growth beyond fr_fix.
Whatever we do to grow fr_fix or fr_var contributes to our returned value.
Although it may not be explicit in the frag, pretend fr_var starts with a
0 value. */
int
md_estimate_size_before_relax (fragP, segment)
fragS * fragP ATTRIBUTE_UNUSED;
segT segment ATTRIBUTE_UNUSED;
{
/* No assembler relaxation is defined (or necessary) for this port. */
abort ();
}
/* *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;
{
/* No assembler relaxation is defined (or necessary) for this port. */
abort ();
}
/* Functions concerning relocs. */
/* The location from which a PC relative jump should be calculated,
given a PC relative reloc. */
long
md_pcrel_from_section (fixP, sec)
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;
}
return fixP->fx_frag->fr_address + fixP->fx_where;
}
/* 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;
{
switch (operand->type)
{
case XSTORMY16_OPERAND_IMM2:
case XSTORMY16_OPERAND_IMM3:
case XSTORMY16_OPERAND_IMM3B:
case XSTORMY16_OPERAND_IMM4:
case XSTORMY16_OPERAND_IMM12:
case XSTORMY16_OPERAND_HMEM8:
return BFD_RELOC_NONE;
case XSTORMY16_OPERAND_IMM8:
case XSTORMY16_OPERAND_LMEM8:
return fixP->fx_pcrel ? BFD_RELOC_8_PCREL : BFD_RELOC_8;
case XSTORMY16_OPERAND_IMM16:
fixP->fx_where += 2;
return fixP->fx_pcrel ? BFD_RELOC_16_PCREL : BFD_RELOC_16;
case XSTORMY16_OPERAND_ABS24:
return BFD_RELOC_XSTORMY16_24;
case XSTORMY16_OPERAND_REL8_2:
case XSTORMY16_OPERAND_REL8_4:
fixP->fx_pcrel = 1;
return BFD_RELOC_8_PCREL;
case XSTORMY16_OPERAND_REL12:
fixP->fx_where += 2;
/* Fall through... */
case XSTORMY16_OPERAND_REL12A:
fixP->fx_pcrel = 1;
return BFD_RELOC_XSTORMY16_REL_12;
default : /* avoid -Wall warning */
abort ();
}
}
/* See whether we need to force a relocation into the output file.
This is used to force out switch and PC relative relocations when
relaxing. */
int
xstormy16_force_relocation (fix)
fixS * fix;
{
switch (fix->fx_r_type)
{
case BFD_RELOC_XSTORMY16_FPTR16:
case BFD_RELOC_VTABLE_INHERIT:
case BFD_RELOC_VTABLE_ENTRY:
return 1;
default:
return 0;
}
}
/* Return true if a relocation against a symbol may be replaced with
a relocation against section+offset. */
boolean
xstormy16_fix_adjustable (fixP)
fixS * fixP;
{
if (fixP->fx_addsy == NULL)
return 1;
/* Prevent all adjustments to global symbols. */
if (S_IS_EXTERN (fixP->fx_addsy))
return 0;
if (S_IS_WEAK (fixP->fx_addsy))
return 0;
/* 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 0;
return ! xstormy16_force_relocation (fixP);
}
/* This is a copy of gas_cgen_md_apply_fix3, with some enhancements to
do various things that would not be valid for all ports. */
void
xstormy16_md_apply_fix3 (fixP, valueP, seg)
fixS * fixP;
valueT * valueP;
segT seg ATTRIBUTE_UNUSED;
{
char *where = fixP->fx_frag->fr_literal + fixP->fx_where;
valueT value;
/* Canonical name, since used a lot. */
CGEN_CPU_DESC cd = gas_cgen_cpu_desc;
/* This port has pc-relative relocs and DIFF_EXPR_OK defined, so
it must deal with turning a BFD_RELOC_{8,16,32,64} into a
BFD_RELOC_*_PCREL for the case of
.word something-.
*/
if (fixP->fx_pcrel)
switch (fixP->fx_r_type)
{
case BFD_RELOC_8:
fixP->fx_r_type = BFD_RELOC_8_PCREL;
break;
case BFD_RELOC_16:
fixP->fx_r_type = BFD_RELOC_16_PCREL;
break;
case BFD_RELOC_32:
fixP->fx_r_type = BFD_RELOC_32_PCREL;
break;
case BFD_RELOC_64:
fixP->fx_r_type = BFD_RELOC_64_PCREL;
break;
default:
break;
}
/* FIXME FIXME FIXME: The value we are passed in *valuep includes
the symbol values. Since we are using BFD_ASSEMBLER, if we are
doing this relocation the code in write.c is going to call
bfd_install_relocation, which is also going to use the symbol
value. That means that if the reloc is fully resolved we want to
use *valuep since bfd_install_relocation is not being used.
However, if the reloc is not fully resolved we do not want to use
*valuep, and must use fx_offset instead. However, if the reloc
is PC relative, we do want to use *valuep since it includes the
result of md_pcrel_from. This is confusing. */
if (fixP->fx_addsy == (symbolS *) NULL)
{
value = *valueP;
fixP->fx_done = 1;
}
else if (fixP->fx_pcrel)
value = *valueP;
else
{
value = fixP->fx_offset;
if (fixP->fx_subsy != (symbolS *) NULL)
{
if (S_GET_SEGMENT (fixP->fx_subsy) == absolute_section)
value -= S_GET_VALUE (fixP->fx_subsy);
else
{
/* We don't actually support subtracting a symbol. */
as_bad_where (fixP->fx_file, fixP->fx_line,
_("expression too complex"));
}
}
}
if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED)
{
int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED;
const CGEN_OPERAND *operand = cgen_operand_lookup_by_num (cd, opindex);
const char *errmsg;
bfd_reloc_code_real_type reloc_type;
CGEN_FIELDS *fields = alloca (CGEN_CPU_SIZEOF_FIELDS (cd));
const CGEN_INSN *insn = fixP->fx_cgen.insn;
/* If the reloc has been fully resolved finish the operand here. */
/* FIXME: This duplicates the capabilities of code in BFD. */
if (fixP->fx_done)
{
CGEN_CPU_SET_FIELDS_BITSIZE (cd) (fields, CGEN_INSN_BITSIZE (insn));
CGEN_CPU_SET_VMA_OPERAND (cd) (cd, opindex, fields, (bfd_vma) value);
#if CGEN_INT_INSN_P
{
CGEN_INSN_INT insn_value =
cgen_get_insn_value (cd, where, CGEN_INSN_BITSIZE (insn));
/* ??? 0 is passed for `pc'. */
errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields,
&insn_value, (bfd_vma) 0);
cgen_put_insn_value (cd, where, CGEN_INSN_BITSIZE (insn),
insn_value);
}
#else
/* ??? 0 is passed for `pc'. */
errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, where,
(bfd_vma) 0);
#endif
if (errmsg)
as_bad_where (fixP->fx_file, fixP->fx_line, "%s", errmsg);
}
if (fixP->fx_done)
return;
/* The operand isn't fully resolved. Determine a BFD reloc value
based on the operand information and leave it to
bfd_install_relocation. Note that this doesn't work when
partial_inplace == false. */
reloc_type = md_cgen_lookup_reloc (insn, operand, fixP);
if (reloc_type != BFD_RELOC_NONE)
{
fixP->fx_r_type = reloc_type;
}
else
{
as_bad_where (fixP->fx_file, fixP->fx_line,
_("unresolved expression that must be resolved"));
fixP->fx_done = 1;
return;
}
}
else if (fixP->fx_done)
{
/* We're finished with this fixup. Install it because
bfd_install_relocation won't be called to do it. */
switch (fixP->fx_r_type)
{
case BFD_RELOC_8:
md_number_to_chars (where, value, 1);
break;
case BFD_RELOC_16:
md_number_to_chars (where, value, 2);
break;
case BFD_RELOC_32:
md_number_to_chars (where, value, 4);
break;
case BFD_RELOC_64:
md_number_to_chars (where, value, 8);
break;
default:
as_bad_where (fixP->fx_file, fixP->fx_line,
_("internal error: can't install fix for reloc type %d (`%s')"),
fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type));
break;
}
}
else
{
/* bfd_install_relocation will be called to finish things up. */
}
/* This is a RELA port. Thus, it does not need to store a
value if it is going to make a reloc. What's more, when
assembling a line like
.byte global-0x7f00
we'll get a spurious error message if we try to stuff 0x7f00 into
the byte. */
if (! fixP->fx_done)
*valueP = 0;
/* Tuck `value' away for use by tc_gen_reloc.
See the comment describing fx_addnumber in write.h.
This field is misnamed (or misused :-). */
fixP->fx_addnumber = value;
}
/* 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_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.
*/
/* 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;
switch (type)
{
case 'f':
case 'F':
prec = 2;
break;
case 'd':
case 'D':
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);
*sizeP = prec * sizeof (LITTLENUM_TYPE);
/* This loops outputs the LITTLENUMs in REVERSE order; in accord with
the littleendianness of the processor. */
for (wordP = words + prec - 1; prec--;)
{
md_number_to_chars (litP, (valueT) (*wordP--), sizeof (LITTLENUM_TYPE));
litP += sizeof (LITTLENUM_TYPE);
}
return 0;
}