mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-24 07:31:32 +00:00
422 lines
12 KiB
C
422 lines
12 KiB
C
/* tc-fr30.c -- Assembler for the Fujitsu FR30.
|
||
Copyright (C) 1998-2017 Free Software Foundation, Inc.
|
||
|
||
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. */
|
||
|
||
#include "as.h"
|
||
#include "safe-ctype.h"
|
||
#include "subsegs.h"
|
||
#include "symcat.h"
|
||
#include "opcodes/fr30-desc.h"
|
||
#include "opcodes/fr30-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];
|
||
}
|
||
fr30_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 FR30_SHORTOPTS ""
|
||
const char * md_shortopts = FR30_SHORTOPTS;
|
||
|
||
struct option md_longopts[] =
|
||
{
|
||
{NULL, no_argument, NULL, 0}
|
||
};
|
||
size_t md_longopts_size = sizeof (md_longopts);
|
||
|
||
int
|
||
md_parse_option (int c ATTRIBUTE_UNUSED,
|
||
const char *arg ATTRIBUTE_UNUSED)
|
||
{
|
||
switch (c)
|
||
{
|
||
default:
|
||
return 0;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
void
|
||
md_show_usage (FILE * stream)
|
||
{
|
||
fprintf (stream, _(" FR30 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 (void)
|
||
{
|
||
/* Initialize the `cgen' interface. */
|
||
|
||
/* Set the machine number and endian. */
|
||
gas_cgen_cpu_desc = fr30_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
|
||
CGEN_CPU_OPEN_ENDIAN,
|
||
CGEN_ENDIAN_BIG,
|
||
CGEN_CPU_OPEN_END);
|
||
fr30_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)
|
||
{
|
||
static int last_insn_had_delay_slot = 0;
|
||
fr30_insn insn;
|
||
char *errmsg;
|
||
|
||
/* Initialize GAS's cgen interface for a new instruction. */
|
||
gas_cgen_init_parse ();
|
||
|
||
insn.insn = fr30_cgen_assemble_insn
|
||
(gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
|
||
|
||
if (!insn.insn)
|
||
{
|
||
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);
|
||
|
||
/* Warn about invalid insns in delay slots. */
|
||
if (last_insn_had_delay_slot
|
||
&& CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_NOT_IN_DELAY_SLOT))
|
||
as_warn (_("Instruction %s not allowed in a delay slot."),
|
||
CGEN_INSN_NAME (insn.insn));
|
||
|
||
last_insn_had_delay_slot
|
||
= CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
|
||
}
|
||
|
||
/* The syntax in the manual says constants begin with '#'.
|
||
We just ignore it. */
|
||
|
||
void
|
||
md_operand (expressionS * expressionP)
|
||
{
|
||
if (* input_line_pointer == '#')
|
||
{
|
||
input_line_pointer ++;
|
||
expression (expressionP);
|
||
}
|
||
}
|
||
|
||
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;
|
||
}
|
||
|
||
/* Interface to relax_segment. */
|
||
|
||
/* FIXME: Build table by hand, get it working, then machine generate. */
|
||
|
||
const relax_typeS md_relax_table[] =
|
||
{
|
||
/* The fields are:
|
||
1) most positive reach of this state,
|
||
2) most negative reach of this state,
|
||
3) how many bytes this mode will add to the size of the current frag
|
||
4) which index into the table to try if we can't fit into this one. */
|
||
|
||
/* The first entry must be unused because an `rlx_more' value of zero ends
|
||
each list. */
|
||
{1, 1, 0, 0},
|
||
|
||
/* The displacement used by GAS is from the end of the 2 byte insn,
|
||
so we subtract 2 from the following. */
|
||
/* 16 bit insn, 8 bit disp -> 10 bit range.
|
||
This doesn't handle a branch in the right slot at the border:
|
||
the "& -4" isn't taken into account. It's not important enough to
|
||
complicate things over it, so we subtract an extra 2 (or + 2 in -ve
|
||
case). */
|
||
{511 - 2 - 2, -512 - 2 + 2, 0, 2 },
|
||
/* 32 bit insn, 24 bit disp -> 26 bit range. */
|
||
{0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 },
|
||
/* Same thing, but with leading nop for alignment. */
|
||
{0x2000000 - 1 - 2, -0x2000000 - 2, 4, 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 (fragS * fragP, segT segment)
|
||
{
|
||
/* The only thing we have to handle here are symbols outside of the
|
||
current segment. They may be undefined or in a different segment in
|
||
which case linker scripts may place them anywhere.
|
||
However, we can't finish the fragment here and emit the reloc as insn
|
||
alignment requirements may move the insn about. */
|
||
|
||
if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
|
||
{
|
||
/* The symbol is undefined in this segment.
|
||
Change the relaxation subtype to the max allowable and leave
|
||
all further handling to md_convert_frag. */
|
||
fragP->fr_subtype = 2;
|
||
|
||
{
|
||
const CGEN_INSN * insn;
|
||
int i;
|
||
|
||
/* Update the recorded insn.
|
||
Fortunately we don't have to look very far.
|
||
FIXME: Change this to record in the instruction the next higher
|
||
relaxable insn to use. */
|
||
for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++)
|
||
{
|
||
if ((strcmp (CGEN_INSN_MNEMONIC (insn),
|
||
CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn))
|
||
== 0)
|
||
&& CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED))
|
||
break;
|
||
}
|
||
if (i == 4)
|
||
abort ();
|
||
|
||
fragP->fr_cgen.insn = insn;
|
||
return 2;
|
||
}
|
||
}
|
||
|
||
/* Return the size of the variable part of the frag. */
|
||
return md_relax_table[fragP->fr_subtype].rlx_length;
|
||
}
|
||
|
||
/* *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)
|
||
{
|
||
}
|
||
|
||
/* Functions concerning relocs. */
|
||
|
||
/* 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;
|
||
|
||
return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1;
|
||
}
|
||
|
||
/* 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 FR30_OPERAND_LABEL9: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL;
|
||
case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL;
|
||
case FR30_OPERAND_DISP10: return BFD_RELOC_FR30_10_IN_8;
|
||
case FR30_OPERAND_DISP9: return BFD_RELOC_FR30_9_IN_8;
|
||
case FR30_OPERAND_DISP8: return BFD_RELOC_FR30_8_IN_8;
|
||
case FR30_OPERAND_UDISP6: return BFD_RELOC_FR30_6_IN_4;
|
||
case FR30_OPERAND_I8: return BFD_RELOC_8;
|
||
case FR30_OPERAND_I32: return BFD_RELOC_FR30_48;
|
||
case FR30_OPERAND_I20: return BFD_RELOC_FR30_20;
|
||
default : /* Avoid -Wall warning. */
|
||
break;
|
||
}
|
||
|
||
return BFD_RELOC_NONE;
|
||
}
|
||
|
||
/* 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);
|
||
}
|
||
|
||
const char *
|
||
md_atof (int type, char * litP, int * sizeP)
|
||
{
|
||
return ieee_md_atof (type, litP, sizeP, TRUE);
|
||
}
|
||
|
||
/* Worker function for fr30_is_colon_insn(). */
|
||
static int
|
||
restore_colon (char *next_i_l_p, char *nul_char)
|
||
{
|
||
/* Restore the colon, and advance input_line_pointer to
|
||
the end of the new symbol. */
|
||
*input_line_pointer = *nul_char;
|
||
input_line_pointer = next_i_l_p;
|
||
*nul_char = *next_i_l_p;
|
||
*next_i_l_p = 0;
|
||
return 1;
|
||
}
|
||
|
||
/* Determines if the symbol starting at START and ending in
|
||
a colon that was at the location pointed to by INPUT_LINE_POINTER
|
||
(but which has now been replaced bu a NUL) is in fact an
|
||
LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction.
|
||
If it is, then it restores the colon, advances INPUT_LINE_POINTER
|
||
to the real end of the instruction/symbol, saves the char there to
|
||
NUL_CHAR and pokes a NUL, and returns 1. Otherwise it returns 0. */
|
||
int
|
||
fr30_is_colon_insn (char *start, char *nul_char)
|
||
{
|
||
char * i_l_p = input_line_pointer;
|
||
|
||
if (*nul_char == '"')
|
||
++i_l_p;
|
||
|
||
/* Check to see if the symbol parsed so far is 'ldi'. */
|
||
if ( (start[0] != 'l' && start[0] != 'L')
|
||
|| (start[1] != 'd' && start[1] != 'D')
|
||
|| (start[2] != 'i' && start[2] != 'I')
|
||
|| start[3] != 0)
|
||
{
|
||
/* Nope - check to see a 'd' follows the colon. */
|
||
if ( (i_l_p[1] == 'd' || i_l_p[1] == 'D')
|
||
&& (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n'))
|
||
{
|
||
/* Yup - it might be delay slot instruction. */
|
||
int i;
|
||
static const char * delay_insns [] =
|
||
{
|
||
"call", "jmp", "ret", "bra", "bno",
|
||
"beq", "bne", "bc", "bnc", "bn",
|
||
"bp", "bv", "bnv", "blt", "bge",
|
||
"ble", "bgt", "bls", "bhi"
|
||
};
|
||
|
||
for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;)
|
||
{
|
||
const char * insn = delay_insns[i];
|
||
int len = strlen (insn);
|
||
|
||
if (start [len] != 0)
|
||
continue;
|
||
|
||
while (len --)
|
||
if (TOLOWER (start [len]) != insn [len])
|
||
break;
|
||
|
||
if (len == -1)
|
||
return restore_colon (i_l_p + 1, nul_char);
|
||
}
|
||
}
|
||
|
||
/* Nope - it is a normal label. */
|
||
return 0;
|
||
}
|
||
|
||
/* Check to see if the text following the colon is '8'. */
|
||
if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
|
||
return restore_colon (i_l_p + 2, nul_char);
|
||
|
||
/* Check to see if the text following the colon is '20'. */
|
||
else if (i_l_p[1] == '2' && i_l_p[2] =='0'
|
||
&& (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
|
||
return restore_colon (i_l_p + 3, nul_char);
|
||
|
||
/* Check to see if the text following the colon is '32'. */
|
||
else if (i_l_p[1] == '3' && i_l_p[2] =='2'
|
||
&& (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
|
||
return restore_colon (i_l_p + 3, nul_char);
|
||
|
||
return 0;
|
||
}
|
||
|
||
bfd_boolean
|
||
fr30_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 0;
|
||
|
||
return 1;
|
||
}
|