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binutils-gdb/gas/config/tc-msp430.c
Ben Elliston 1a9a8ab429 Remove redundant returns in void functions.
2003-12-10 06:41:08 +00:00

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/* tc-msp430.c -- Assembler code for the Texas Instruments MSP430
Copyright (C) 2002, 2003 Free Software Foundation, Inc.
Contributed by Dmitry Diky <diwil@mail.ru>
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 <string.h>
#include <stdlib.h>
#include <limits.h>
#define PUSH_1X_WORKAROUND
#include "as.h"
#include "subsegs.h"
#include "opcode/msp430.h"
#include "safe-ctype.h"
const char comment_chars[] = ";";
const char line_comment_chars[] = "#";
const char line_separator_chars[] = "";
const char EXP_CHARS[] = "eE";
const char FLT_CHARS[] = "dD";
/* Handle long expressions. */
extern LITTLENUM_TYPE generic_bignum[];
static struct hash_control *msp430_hash;
static unsigned int msp430_operands
PARAMS ((struct msp430_opcode_s *, char *));
static int msp430_srcoperand
PARAMS ((struct msp430_operand_s *, char *, int, int *));
static int msp430_dstoperand
PARAMS ((struct msp430_operand_s *, char *, int));
static char *parse_exp
PARAMS ((char *, expressionS *));
static inline char *skip_space
PARAMS ((char *));
static int check_reg
PARAMS ((char *));
static void msp430_set_arch
PARAMS ((int));
static void show_mcu_list
PARAMS ((FILE *));
static void del_spaces
PARAMS ((char *));
#define MAX_OP_LEN 256
struct mcu_type_s
{
char *name;
int isa;
int mach;
};
#define MSP430_ISA_11 11
#define MSP430_ISA_110 110
#define MSP430_ISA_12 12
#define MSP430_ISA_13 13
#define MSP430_ISA_14 14
#define MSP430_ISA_15 15
#define MSP430_ISA_16 16
#define MSP430_ISA_31 31
#define MSP430_ISA_32 32
#define MSP430_ISA_33 33
#define MSP430_ISA_41 41
#define MSP430_ISA_42 42
#define MSP430_ISA_43 43
#define MSP430_ISA_44 44
#define CHECK_RELOC_MSP430 ((imm_op || byte_op)?BFD_RELOC_MSP430_16_BYTE:BFD_RELOC_MSP430_16)
#define CHECK_RELOC_MSP430_PCREL ((imm_op || byte_op)?BFD_RELOC_MSP430_16_PCREL_BYTE:BFD_RELOC_MSP430_16_PCREL)
static struct mcu_type_s mcu_types[] =
{
{"msp1", MSP430_ISA_11, bfd_mach_msp11},
{"msp2", MSP430_ISA_14, bfd_mach_msp14},
{"msp430x110", MSP430_ISA_11, bfd_mach_msp11},
{"msp430x112", MSP430_ISA_11, bfd_mach_msp11},
{"msp430x1101",MSP430_ISA_110, bfd_mach_msp110},
{"msp430x1111",MSP430_ISA_110, bfd_mach_msp110},
{"msp430x1121",MSP430_ISA_110, bfd_mach_msp110},
{"msp430x1122",MSP430_ISA_11, bfd_mach_msp110},
{"msp430x1132",MSP430_ISA_11, bfd_mach_msp110},
{"msp430x122", MSP430_ISA_12, bfd_mach_msp12},
{"msp430x123", MSP430_ISA_12, bfd_mach_msp12},
{"msp430x1222",MSP430_ISA_12, bfd_mach_msp12},
{"msp430x1232",MSP430_ISA_12, bfd_mach_msp12},
{"msp430x133", MSP430_ISA_13, bfd_mach_msp13},
{"msp430x135", MSP430_ISA_13, bfd_mach_msp13},
{"msp430x1331",MSP430_ISA_13, bfd_mach_msp13},
{"msp430x1351",MSP430_ISA_13, bfd_mach_msp13},
{"msp430x147", MSP430_ISA_14, bfd_mach_msp14},
{"msp430x148", MSP430_ISA_14, bfd_mach_msp14},
{"msp430x149", MSP430_ISA_14, bfd_mach_msp14},
{"msp430x155", MSP430_ISA_15, bfd_mach_msp15},
{"msp430x156", MSP430_ISA_15, bfd_mach_msp15},
{"msp430x157", MSP430_ISA_15, bfd_mach_msp15},
{"msp430x167", MSP430_ISA_16, bfd_mach_msp16},
{"msp430x168", MSP430_ISA_16, bfd_mach_msp16},
{"msp430x169", MSP430_ISA_16, bfd_mach_msp16},
{"msp430x311", MSP430_ISA_31, bfd_mach_msp31},
{"msp430x312", MSP430_ISA_31, bfd_mach_msp31},
{"msp430x313", MSP430_ISA_31, bfd_mach_msp31},
{"msp430x314", MSP430_ISA_31, bfd_mach_msp31},
{"msp430x315", MSP430_ISA_31, bfd_mach_msp31},
{"msp430x323", MSP430_ISA_32, bfd_mach_msp32},
{"msp430x325", MSP430_ISA_32, bfd_mach_msp32},
{"msp430x336", MSP430_ISA_33, bfd_mach_msp33},
{"msp430x337", MSP430_ISA_33, bfd_mach_msp33},
{"msp430x412", MSP430_ISA_41, bfd_mach_msp41},
{"msp430x413", MSP430_ISA_41, bfd_mach_msp41},
{"msp430xE423", MSP430_ISA_42, bfd_mach_msp42},
{"msp430xE425", MSP430_ISA_42, bfd_mach_msp42},
{"msp430xE427", MSP430_ISA_42, bfd_mach_msp42},
{"msp430xW423", MSP430_ISA_42, bfd_mach_msp42},
{"msp430xW425", MSP430_ISA_42, bfd_mach_msp42},
{"msp430xW427", MSP430_ISA_42, bfd_mach_msp42},
{"msp430x435", MSP430_ISA_43, bfd_mach_msp43},
{"msp430x436", MSP430_ISA_43, bfd_mach_msp43},
{"msp430x437", MSP430_ISA_43, bfd_mach_msp43},
{"msp430x447", MSP430_ISA_44, bfd_mach_msp44},
{"msp430x448", MSP430_ISA_44, bfd_mach_msp44},
{"msp430x449", MSP430_ISA_44, bfd_mach_msp44},
{NULL, 0, 0}
};
static struct mcu_type_s default_mcu =
{ "msp430x11", MSP430_ISA_11, bfd_mach_msp11 };
static struct mcu_type_s *msp430_mcu = &default_mcu;
const pseudo_typeS md_pseudo_table[] =
{
{"arch", msp430_set_arch, 0},
{NULL, NULL, 0}
};
#define OPTION_MMCU 'm'
const char *md_shortopts = "m:";
struct option md_longopts[] =
{
{"mmcu", required_argument, NULL, OPTION_MMCU},
{NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof (md_longopts);
static void
show_mcu_list (stream)
FILE *stream;
{
int i;
fprintf (stream, _("Known MCU names:\n"));
for (i = 0; mcu_types[i].name; i++)
fprintf (stream, _("\t %s\n"), mcu_types[i].name);
fprintf (stream, "\n");
}
void
md_show_usage (stream)
FILE *stream;
{
fprintf (stream,
_("MSP430 options:\n"
" -mmcu=[msp430-name] select microcontroller type\n"
" msp430x110 msp430x112\n"
" msp430x1101 msp430x1111\n"
" msp430x1121 msp430x1122 msp430x1132\n"
" msp430x122 msp430x123\n"
" msp430x1222 msp430x1232\n"
" msp430x133 msp430x135\n"
" msp430x1331 msp430x1351\n"
" msp430x147 msp430x148 msp430x149\n"
" msp430x155 msp430x156 msp430x157\n"
" msp430x167 msp430x168 msp430x169\n"
" msp430x311 msp430x312 msp430x313 msp430x314 msp430x315\n"
" msp430x323 msp430x325\n"
" msp430x336 msp430x337\n"
" msp430x412 msp430x413\n"
" msp430xE423 msp430xE425 msp430E427\n"
" msp430xW423 msp430xW425 msp430W427\n"
" msp430x435 msp430x436 msp430x437\n"
" msp430x447 msp430x448 msp430x449\n"));
show_mcu_list (stream);
}
static char *
extract_word (char *from, char *to, int limit)
{
char *op_start;
char *op_end;
int size = 0;
/* Drop leading whitespace. */
from = skip_space (from);
*to = 0;
/* Find the op code end. */
for (op_start = op_end = from; *op_end != 0 && is_part_of_name (*op_end);)
{
to[size++] = *op_end++;
if (size + 1 >= limit)
break;
}
to[size] = 0;
return op_end;
}
static void
msp430_set_arch (dummy)
int dummy ATTRIBUTE_UNUSED;
{
char *str = (char *) alloca (32); /* 32 for good measure. */
input_line_pointer = extract_word (input_line_pointer, str, 32);
md_parse_option (OPTION_MMCU, str);
bfd_set_arch_mach (stdoutput, TARGET_ARCH, msp430_mcu->mach);
}
int
md_parse_option (c, arg)
int c;
char *arg;
{
int i;
switch (c)
{
case OPTION_MMCU:
for (i = 0; mcu_types[i].name; ++i)
if (strcmp (mcu_types[i].name, arg) == 0)
break;
if (!mcu_types[i].name)
{
show_mcu_list (stderr);
as_fatal (_("unknown MCU: %s\n"), arg);
}
if (msp430_mcu == &default_mcu || msp430_mcu->mach == mcu_types[i].mach)
msp430_mcu = &mcu_types[i];
else
as_fatal (_("redefinition of mcu type %s' to %s'"),
msp430_mcu->name, mcu_types[i].name);
return 1;
}
return 0;
}
symbolS *
md_undefined_symbol (name)
char *name ATTRIBUTE_UNUSED;
{
return 0;
}
static inline char *
skip_space (s)
char *s;
{
while (ISSPACE (*s))
++s;
return s;
}
/* Delete spaces from s: X ( r 1 2) => X(r12). */
static void
del_spaces (s)
char *s;
{
while (*s)
{
if (ISSPACE (*s))
{
char *m = s + 1;
while (ISSPACE (*m) && *m)
m++;
memmove (s, m, strlen (m) + 1);
}
else
s++;
}
}
/* Extract one word from FROM and copy it to TO. Delimeters are ",;\n" */
static char *
extract_operand (char *from, char *to, int limit)
{
int size = 0;
/* Drop leading whitespace. */
from = skip_space (from);
while (size < limit && *from)
{
*(to + size) = *from;
if (*from == ',' || *from == ';' || *from == '\n')
break;
from++;
size++;
}
*(to + size) = 0;
del_spaces (to);
from++;
return from;
}
static char *
extract_cmd (char *from, char *to, int limit)
{
int size = 0;
while (*from && ! ISSPACE (*from) && *from != '.' && limit > size)
{
*(to + size) = *from;
from++;
size++;
}
*(to + size) = 0;
return from;
}
/* 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. */
char *
md_atof (type, litP, sizeP)
int type;
char *litP;
int *sizeP;
{
int prec;
LITTLENUM_TYPE words[4];
LITTLENUM_TYPE *wordP;
char *t;
switch (type)
{
case 'f':
prec = 2;
break;
case 'd':
prec = 4;
break;
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 loop outputs the LITTLENUMs in REVERSE order. */
for (wordP = words + prec - 1; prec--;)
{
md_number_to_chars (litP, (valueT) (*wordP--), sizeof (LITTLENUM_TYPE));
litP += sizeof (LITTLENUM_TYPE);
}
return NULL;
}
void
md_convert_frag (abfd, sec, fragP)
bfd *abfd ATTRIBUTE_UNUSED;
asection *sec ATTRIBUTE_UNUSED;
fragS *fragP ATTRIBUTE_UNUSED;
{
abort ();
}
void
md_begin ()
{
struct msp430_opcode_s *opcode;
msp430_hash = hash_new ();
for (opcode = msp430_opcodes; opcode->name; opcode++)
hash_insert (msp430_hash, opcode->name, (char *) opcode);
bfd_set_arch_mach (stdoutput, TARGET_ARCH, msp430_mcu->mach);
}
void
md_assemble (str)
char *str;
{
struct msp430_opcode_s *opcode;
char cmd[32];
unsigned int i = 0;
str = skip_space (str); /* Skip leading spaces. */
str = extract_cmd (str, cmd, sizeof (cmd));
while (cmd[i] && i < sizeof (cmd))
{
char a = TOLOWER (cmd[i]);
cmd[i] = a;
i++;
}
if (!cmd[0])
{
as_bad (_("can't find opcode "));
return;
}
opcode = (struct msp430_opcode_s *) hash_find (msp430_hash, cmd);
if (opcode == NULL)
{
as_bad (_("unknown opcode `%s'"), cmd);
return;
}
{
char *__t = input_line_pointer;
msp430_operands (opcode, str);
input_line_pointer = __t;
}
}
/* Parse instruction operands.
Return binary opcode. */
static unsigned int
msp430_operands (opcode, line)
struct msp430_opcode_s *opcode;
char *line;
{
int bin = opcode->bin_opcode; /* opcode mask. */
int __is;
char l1[MAX_OP_LEN], l2[MAX_OP_LEN];
char *frag;
int where;
struct msp430_operand_s op1, op2;
int res = 0;
static short ZEROS = 0;
int byte_op, imm_op;
/* opcode is the one from opcodes table
line contains something like
[.w] @r2+, 5(R1)
or
.b @r2+, 5(R1). */
/* Check if byte or word operation. */
if (*line == '.' && TOLOWER (*(line + 1)) == 'b')
{
bin |= BYTE_OPERATION;
byte_op = 1;
}
else
byte_op = 0;
/* skip .[bwBW]. */
while (! ISSPACE (*line) && *line)
line++;
if (opcode->insn_opnumb && (!*line || *line == '\n'))
{
as_bad (_("instruction %s requires %d operand(s)"),
opcode->name, opcode->insn_opnumb);
return 0;
}
memset (l1, 0, sizeof (l1));
memset (l2, 0, sizeof (l2));
memset (&op1, 0, sizeof (op1));
memset (&op2, 0, sizeof (op2));
imm_op = 0;
switch (opcode->fmt)
{
case 0: /* Emulated. */
switch (opcode->insn_opnumb)
{
case 0:
/* Set/clear bits instructions. */
__is = 2;
frag = frag_more (__is);
bfd_putl16 ((bfd_vma) bin, frag);
break;
case 1:
/* Something which works with destination operand. */
line = extract_operand (line, l1, sizeof (l1));
res = msp430_dstoperand (&op1, l1, opcode->bin_opcode);
if (res)
break;
bin |= (op1.reg | (op1.am << 7));
__is = 1 + op1.ol;
frag = frag_more (2 * __is);
where = frag - frag_now->fr_literal;
bfd_putl16 ((bfd_vma) bin, frag);
if (op1.mode == OP_EXP)
{
where += 2;
bfd_putl16 ((bfd_vma) ZEROS, frag + 2);
if (op1.reg)
fix_new_exp (frag_now, where, 2,
&(op1.exp), FALSE, CHECK_RELOC_MSP430);
else
fix_new_exp (frag_now, where, 2,
&(op1.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
break;
case 2:
{
/* Shift instruction. */
line = extract_operand (line, l1, sizeof (l1));
strncpy (l2, l1, sizeof (l2));
l2[sizeof (l2) - 1] = '\0';
res = msp430_srcoperand (&op1, l1, opcode->bin_opcode, &imm_op);
res += msp430_dstoperand (&op2, l2, opcode->bin_opcode);
if (res)
break; /* An error occurred. All warnings were done before. */
bin |= (op2.reg | (op1.reg << 8) | (op1.am << 4) | (op2.am << 7));
__is = 1 + op1.ol + op2.ol; /* insn size in words. */
frag = frag_more (2 * __is);
where = frag - frag_now->fr_literal;
bfd_putl16 ((bfd_vma) bin, frag);
if (op1.mode == OP_EXP)
{
where += 2; /* Advance 'where' as we do not know _where_. */
bfd_putl16 ((bfd_vma) ZEROS, frag + 2);
if (op1.reg || (op1.reg == 0 && op1.am == 3)) /* Not PC relative. */
fix_new_exp (frag_now, where, 2,
&(op1.exp), FALSE, CHECK_RELOC_MSP430);
else
fix_new_exp (frag_now, where, 2,
&(op1.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
if (op2.mode == OP_EXP)
{
imm_op = 0;
bfd_putl16 ((bfd_vma) ZEROS, frag + 2 + ((__is == 3) ? 2 : 0));
if (op2.reg) /* Not PC relative. */
fix_new_exp (frag_now, where + 2, 2,
&(op2.exp), FALSE, CHECK_RELOC_MSP430);
else
fix_new_exp (frag_now, where + 2, 2,
&(op2.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
break;
}
case 3:
/* Branch instruction => mov dst, r0. */
line = extract_operand (line, l1, sizeof (l1));
res = msp430_srcoperand (&op1, l1, opcode->bin_opcode, &imm_op);
if (res)
break;
byte_op = 0;
imm_op = 0;
bin |= ((op1.reg << 8) | (op1.am << 4));
__is = 1 + op1.ol;
frag = frag_more (2 * __is);
where = frag - frag_now->fr_literal;
bfd_putl16 ((bfd_vma) bin, frag);
if (op1.mode == OP_EXP)
{
where += 2;
bfd_putl16 ((bfd_vma) ZEROS, frag + 2);
if (op1.reg || (op1.reg == 0 && op1.am == 3))
fix_new_exp (frag_now, where, 2,
&(op1.exp), FALSE, CHECK_RELOC_MSP430);
else
fix_new_exp (frag_now, where, 2,
&(op1.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
break;
}
break;
case 1: /* Format 1, double operand. */
line = extract_operand (line, l1, sizeof (l1));
line = extract_operand (line, l2, sizeof (l2));
res = msp430_srcoperand (&op1, l1, opcode->bin_opcode, &imm_op);
res += msp430_dstoperand (&op2, l2, opcode->bin_opcode);
if (res)
break; /* Error occurred. All warnings were done before. */
bin |= (op2.reg | (op1.reg << 8) | (op1.am << 4) | (op2.am << 7));
__is = 1 + op1.ol + op2.ol; /* insn size in words. */
frag = frag_more (2 * __is);
where = frag - frag_now->fr_literal;
bfd_putl16 ((bfd_vma) bin, frag);
if (op1.mode == OP_EXP)
{
where += 2; /* Advance where as we do not know _where_. */
bfd_putl16 ((bfd_vma) ZEROS, frag + 2);
if (op1.reg || (op1.reg == 0 && op1.am == 3)) /* Not PC relative. */
fix_new_exp (frag_now, where, 2,
&(op1.exp), FALSE, CHECK_RELOC_MSP430);
else
fix_new_exp (frag_now, where, 2,
&(op1.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
if (op2.mode == OP_EXP)
{
imm_op = 0;
bfd_putl16 ((bfd_vma) ZEROS, frag + 2 + ((__is == 3) ? 2 : 0));
if (op2.reg) /* Not PC relative. */
fix_new_exp (frag_now, where + 2, 2,
&(op2.exp), FALSE, CHECK_RELOC_MSP430);
else
fix_new_exp (frag_now, where + 2, 2,
&(op2.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
break;
case 2: /* Single-operand mostly instr. */
if (opcode->insn_opnumb == 0)
{
/* reti instruction. */
frag = frag_more (2);
bfd_putl16 ((bfd_vma) bin, frag);
break;
}
line = extract_operand (line, l1, sizeof (l1));
res = msp430_srcoperand (&op1, l1, opcode->bin_opcode, &imm_op);
if (res)
break; /* Error in operand. */
bin |= op1.reg | (op1.am << 4);
__is = 1 + op1.ol;
frag = frag_more (2 * __is);
where = frag - frag_now->fr_literal;
bfd_putl16 ((bfd_vma) bin, frag);
if (op1.mode == OP_EXP)
{
bfd_putl16 ((bfd_vma) ZEROS, frag + 2);
if (op1.reg || (op1.reg == 0 && op1.am == 3)) /* Not PC relative. */
fix_new_exp (frag_now, where + 2, 2,
&(op1.exp), FALSE, CHECK_RELOC_MSP430);
else
fix_new_exp (frag_now, where + 2, 2,
&(op1.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
break;
case 3: /* Conditional jumps instructions. */
line = extract_operand (line, l1, sizeof (l1));
/* l1 is a label. */
if (l1[0])
{
char *m = l1;
expressionS exp;
if (*m == '$')
m++;
parse_exp (m, &exp);
frag = frag_more (2); /* Instr size is 1 word. */
/* In order to handle something like:
and #0x8000, r5
tst r5
jz 4 ; skip next 4 bytes
inv r5
inc r5
nop ; will jump here if r5 positive or zero
jCOND -n ;assumes jump n bytes backward:
mov r5,r6
jmp -2
is equal to:
lab:
mov r5,r6
jmp lab
jCOND $n ; jump from PC in either direction. */
if (exp.X_op == O_constant)
{
int x = exp.X_add_number;
if (x & 1)
{
as_warn (_("Even number required. Rounded to %d"), x + 1);
x++;
}
if ((*l1 == '$' && x > 0) || x < 0)
x -= 2;
x >>= 1;
if (x > 512 || x < -511)
{
as_bad (_("Wrong displacement %d"), x << 1);
break;
}
bin |= x & 0x3ff;
bfd_putl16 ((bfd_vma) bin, frag);
}
else if (exp.X_op == O_symbol && *l1 != '$')
{
where = frag - frag_now->fr_literal;
fix_new_exp (frag_now, where, 2,
&exp, TRUE, BFD_RELOC_MSP430_10_PCREL);
bfd_putl16 ((bfd_vma) bin, frag);
}
else if (*l1 == '$')
{
as_bad (_("instruction requires label sans '$'"));
break;
}
else
{
as_bad (_
("instruction requires label or value in range -511:512"));
break;
}
}
else
{
as_bad (_("instruction requires label"));
break;
}
break;
default:
as_bad (_("Ilegal instruction or not implmented opcode."));
}
input_line_pointer = line;
return 0;
}
static int
msp430_dstoperand (op, l, bin)
struct msp430_operand_s *op;
char *l;
int bin;
{
int dummy;
int ret = msp430_srcoperand (op, l, bin, &dummy);
if (ret)
return ret;
if (op->am == 2)
{
char *__tl = "0";
op->mode = OP_EXP;
op->am = 1;
op->ol = 1;
parse_exp (__tl, &(op->exp));
if (op->exp.X_op != O_constant || op->exp.X_add_number != 0)
{
as_bad (_("Internal bug. Try to use 0(r%d) instead of @r%d"),
op->reg, op->reg);
return 1;
}
return 0;
}
if (op->am > 1)
{
as_bad (_
("this addressing mode is not applicable for destination operand"));
return 1;
}
return 0;
}
static int
check_reg (t)
char *t;
{
/* If this is a reg numb, str 't' must be a number from 0 - 15. */
if (strlen (t) > 2 && *(t + 2) != '+')
return 1;
while (*t)
{
if ((*t < '0' || *t > '9') && *t != '+')
break;
t++;
}
if (*t)
return 1;
return 0;
}
static int
msp430_srcoperand (op, l, bin, imm_op)
struct msp430_operand_s *op;
char *l;
int bin;
int *imm_op;
{
char *__tl = l;
/* Check if an immediate #VALUE. The hash sign should be only at the beginning! */
if (*l == '#')
{
char *h = l;
int vshift = -1;
int rval = 0;
/* Check if there is:
llo(x) - least significant 16 bits, x &= 0xffff
lhi(x) - x = (x >> 16) & 0xffff,
hlo(x) - x = (x >> 32) & 0xffff,
hhi(x) - x = (x >> 48) & 0xffff
The value _MUST_ be constant expression: #hlo(1231231231). */
*imm_op = 1;
if (strncasecmp (h, "#llo(", 5) == 0)
{
vshift = 0;
rval = 3;
}
else if (strncasecmp (h, "#lhi(", 5) == 0)
{
vshift = 1;
rval = 3;
}
else if (strncasecmp (h, "#hlo(", 5) == 0)
{
vshift = 2;
rval = 3;
}
else if (strncasecmp (h, "#hhi(", 5) == 0)
{
vshift = 3;
rval = 3;
}
else if (strncasecmp (h, "#lo(", 4) == 0)
{
vshift = 0;
rval = 2;
}
else if (strncasecmp (h, "#hi(", 4) == 0)
{
vshift = 1;
rval = 2;
}
op->reg = 0; /* Reg PC. */
op->am = 3;
op->ol = 1; /* Immediate will follow an instruction. */
__tl = h + 1 + rval;
op->mode = OP_EXP;
parse_exp (__tl, &(op->exp));
if (op->exp.X_op == O_constant)
{
int x = op->exp.X_add_number;
if (vshift == 0)
{
x = x & 0xffff;
op->exp.X_add_number = x;
}
else if (vshift == 1)
{
x = (x >> 16) & 0xffff;
op->exp.X_add_number = x;
}
else if (vshift > 1)
{
if (x < 0)
op->exp.X_add_number = -1;
else
op->exp.X_add_number = 0; /* Nothing left. */
x = op->exp.X_add_number;
}
if (op->exp.X_add_number > 65535 || op->exp.X_add_number < -32768)
{
as_bad (_("value %ld out of range. Use #lo() or #hi()"), x);
return 1;
}
/* Now check constants. */
/* Substitute register mode with a constant generator if applicable. */
x = (short) x; /* Extend sign. */
if (x == 0)
{
op->reg = 3;
op->am = 0;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 1)
{
op->reg = 3;
op->am = 1;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 2)
{
op->reg = 3;
op->am = 2;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == -1)
{
op->reg = 3;
op->am = 3;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 4)
{
#ifdef PUSH_1X_WORKAROUND
if (bin == 0x1200)
{
/* Remove warning as confusing.
as_warn(_("Hardware push bug workaround")); */
}
else
#endif
{
op->reg = 2;
op->am = 2;
op->ol = 0;
op->mode = OP_REG;
}
}
else if (x == 8)
{
#ifdef PUSH_1X_WORKAROUND
if (bin == 0x1200)
{
/* Remove warning as confusing.
as_warn(_("Hardware push bug workaround")); */
}
else
#endif
{
op->reg = 2;
op->am = 3;
op->ol = 0;
op->mode = OP_REG;
}
}
}
else if (op->exp.X_op == O_symbol)
{
op->mode = OP_EXP;
}
else if (op->exp.X_op == O_big)
{
short x;
if (vshift != -1)
{
op->exp.X_op = O_constant;
op->exp.X_add_number = 0xffff & generic_bignum[vshift];
x = op->exp.X_add_number;
}
else
{
as_bad (_
("unknown expression in operand %s. use #llo() #lhi() #hlo() #hhi() "),
l);
return 1;
}
if (x == 0)
{
op->reg = 3;
op->am = 0;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 1)
{
op->reg = 3;
op->am = 1;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 2)
{
op->reg = 3;
op->am = 2;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == -1)
{
op->reg = 3;
op->am = 3;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 4)
{
op->reg = 2;
op->am = 2;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 8)
{
op->reg = 2;
op->am = 3;
op->ol = 0;
op->mode = OP_REG;
}
}
else
{
as_bad (_("unknown operand %s"), l);
}
return 0;
}
/* Check if absolute &VALUE (assume that we can construct something like ((a&b)<<7 + 25). */
if (*l == '&')
{
char *h = l;
op->reg = 2; /* reg 2 in absolute addr mode. */
op->am = 1; /* mode As == 01 bin. */
op->ol = 1; /* Immediate value followed by instruction. */
__tl = h + 1;
parse_exp (__tl, &(op->exp));
op->mode = OP_EXP;
if (op->exp.X_op == O_constant)
{
int x = op->exp.X_add_number;
if (x > 65535 || x < -32768)
{
as_bad (_("value out of range: %d"), x);
return 1;
}
}
else if (op->exp.X_op == O_symbol)
{
}
else
{
as_bad (_("unknown expression in operand %s"), l);
return 1;
}
return 0;
}
/* Check if indirect register mode @Rn / postincrement @Rn+. */
if (*l == '@')
{
char *t = l;
char *m = strchr (l, '+');
if (t != l)
{
as_bad (_("unknown addressing mode %s"), l);
return 1;
}
t++;
if (*t != 'r' && *t != 'R')
{
as_bad (_("unknown addressing mode %s"), l);
return 1;
}
t++; /* Points to the reg value. */
if (check_reg (t))
{
as_bad (_("Bad register name r%s"), t);
return 1;
}
op->mode = OP_REG;
op->am = m ? 3 : 2;
op->ol = 0;
if (m)
*m = 0; /* strip '+' */
op->reg = atoi (t);
if (op->reg < 0 || op->reg > 15)
{
as_bad (_("MSP430 does not have %d registers"), op->reg);
return 1;
}
return 0;
}
/* Check if register indexed X(Rn). */
do
{
char *h = strrchr (l, '(');
char *m = strrchr (l, ')');
char *t;
*imm_op = 1;
if (!h)
break;
if (!m)
{
as_bad (_("')' required"));
return 1;
}
t = h;
op->am = 1;
op->ol = 1;
/* Extract a register. */
t++; /* Advance pointer. */
if (*t != 'r' && *t != 'R')
{
as_bad (_
("unknown operator %s. Did you mean X(Rn) or #[hl][hl][oi](CONST) ?"),
l);
return 1;
}
t++;
op->reg = *t - '0';
if (op->reg > 9 || op->reg < 0)
{
as_bad (_("unknown operator (r%s substituded as a register name"),
t);
return 1;
}
t++;
if (*t != ')')
{
op->reg = op->reg * 10;
op->reg += *t - '0';
if (op->reg > 15)
{
as_bad (_("unknown operator %s"), l);
return 1;
}
if (op->reg == 2)
{
as_bad (_("r2 should not be used in indexed addressing mode"));
return 1;
}
if (*(t + 1) != ')')
{
as_bad (_("unknown operator %s"), l);
return 1;
}
}
/* Extract constant. */
__tl = l;
*h = 0;
op->mode = OP_EXP;
parse_exp (__tl, &(op->exp));
if (op->exp.X_op == O_constant)
{
int x = op->exp.X_add_number;
if (x > 65535 || x < -32768)
{
as_bad (_("value out of range: %d"), x);
return 1;
}
if (x == 0)
{
op->mode = OP_REG;
op->am = 2;
op->ol = 0;
return 0;
}
}
else if (op->exp.X_op == O_symbol)
{
}
else
{
as_bad (_("unknown expression in operand %s"), l);
return 1;
}
return 0;
}
while (0);
/* Register mode 'mov r1,r2'. */
do
{
char *t = l;
/* Operand should be a register. */
if (*t == 'r' || *t == 'R')
{
int x = atoi (t + 1);
if (check_reg (t + 1))
break;
if (x < 0 || x > 15)
break; /* Symbolic mode. */
op->mode = OP_REG;
op->am = 0;
op->ol = 0;
op->reg = x;
return 0;
}
}
while (0);
/* Symbolic mode 'mov a, b' == 'mov x(pc), y(pc)'. */
do
{
char *t = l;
__tl = l;
while (*t)
{
/* alpha/number underline dot for labels. */
if (! ISALNUM (*t) && *t != '_' && *t != '.')
{
as_bad (_("unknown operand %s"), l);
return 1;
}
t++;
}
op->mode = OP_EXP;
op->reg = 0; /* PC relative... be careful. */
op->am = 1;
op->ol = 1;
__tl = l;
parse_exp (__tl, &(op->exp));
return 0;
}
while (0);
/* Unreachable. */
as_bad (_("unknown addressing mode for operand %s"), l);
return 1;
}
/* GAS will call this function for each section at the end of the assembly,
to permit the CPU backend to adjust the alignment of a section. */
valueT
md_section_align (seg, addr)
asection *seg;
valueT addr;
{
int align = bfd_get_section_alignment (stdoutput, seg);
return ((addr + (1 << align) - 1) & (-1 << align));
}
/* If you define this macro, it should return the offset between the
address of a PC relative fixup and the position from which the PC
relative adjustment should be made. On many processors, the base
of a PC relative instruction is the next instruction, so this
macro would return the length of an instruction. */
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)))
return 0;
return fixp->fx_frag->fr_address + fixp->fx_where;
}
/* GAS will call this for each fixup. It should store the correct
value in the object file. */
void
md_apply_fix3 (fixp, valuep, seg)
fixS *fixp;
valueT *valuep;
segT seg;
{
unsigned char *where;
unsigned long insn;
long value;
if (fixp->fx_addsy == (symbolS *) NULL)
{
value = *valuep;
fixp->fx_done = 1;
}
else if (fixp->fx_pcrel)
{
segT s = S_GET_SEGMENT (fixp->fx_addsy);
if (fixp->fx_addsy && (s == seg || s == absolute_section))
{
value = S_GET_VALUE (fixp->fx_addsy) + *valuep;
fixp->fx_done = 1;
}
else
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);
fixp->fx_done = 1;
}
else
{
/* We don't actually support subtracting a symbol. */
as_bad_where (fixp->fx_file, fixp->fx_line,
_("expression too complex"));
}
}
}
switch (fixp->fx_r_type)
{
default:
fixp->fx_no_overflow = 1;
break;
case BFD_RELOC_MSP430_10_PCREL:
break;
}
if (fixp->fx_done)
{
/* Fetch the instruction, insert the fully resolved operand
value, and stuff the instruction back again. */
where = fixp->fx_frag->fr_literal + fixp->fx_where;
insn = bfd_getl16 (where);
switch (fixp->fx_r_type)
{
case BFD_RELOC_MSP430_10_PCREL:
if (value & 1)
as_bad_where (fixp->fx_file, fixp->fx_line,
_("odd address operand: %ld"), value);
/* Jumps are in words. */
value >>= 1;
--value; /* Correct PC. */
if (value < -512 || value > 511)
as_bad_where (fixp->fx_file, fixp->fx_line,
_("operand out of range: %ld"), value);
value &= 0x3ff; /* get rid of extended sign */
bfd_putl16 ((bfd_vma) (value | insn), where);
break;
case BFD_RELOC_MSP430_16_PCREL:
if (value & 1)
as_bad_where (fixp->fx_file, fixp->fx_line,
_("odd address operand: %ld"), value);
/* Nothing to be corrected here. */
if (value < -32768 || value > 65536)
as_bad_where (fixp->fx_file, fixp->fx_line,
_("operand out of range: %ld"), value);
value &= 0xffff; /* Get rid of extended sign. */
bfd_putl16 ((bfd_vma) value, where);
break;
case BFD_RELOC_MSP430_16_PCREL_BYTE:
/* Nothing to be corrected here. */
if (value < -32768 || value > 65536)
as_bad_where (fixp->fx_file, fixp->fx_line,
_("operand out of range: %ld"), value);
value &= 0xffff; /* Get rid of extended sign. */
bfd_putl16 ((bfd_vma) value, where);
break;
case BFD_RELOC_32:
bfd_putl16 ((bfd_vma) value, where);
break;
case BFD_RELOC_MSP430_16:
case BFD_RELOC_16:
case BFD_RELOC_MSP430_16_BYTE:
value &= 0xffff;
bfd_putl16 ((bfd_vma) value, where);
break;
default:
as_fatal (_("line %d: unknown relocation type: 0x%x"),
fixp->fx_line, fixp->fx_r_type);
break;
}
}
else
{
fixp->fx_addnumber = value;
}
}
/* A `BFD_ASSEMBLER' GAS will call this to generate a reloc. GAS
will pass the resulting reloc to `bfd_install_relocation'. This
currently works poorly, as `bfd_install_relocation' often does the
wrong thing, and instances of `tc_gen_reloc' have been written to
work around the problems, which in turns makes it difficult to fix
`bfd_install_relocation'. */
/* If while processing a fixup, a reloc really needs to be created
then it is done here. */
arelent *
tc_gen_reloc (seg, fixp)
asection *seg ATTRIBUTE_UNUSED;
fixS *fixp;
{
arelent *reloc;
reloc = (arelent *) xmalloc (sizeof (arelent));
reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
*reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
if (reloc->howto == (reloc_howto_type *) NULL)
{
as_bad_where (fixp->fx_file, fixp->fx_line,
_("reloc %d not supported by object file format"),
(int) fixp->fx_r_type);
return NULL;
}
if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT
|| fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
reloc->address = fixp->fx_offset;
reloc->addend = fixp->fx_offset;
return reloc;
}
/* Parse ordinary expression. */
static char *
parse_exp (s, op)
char *s;
expressionS *op;
{
input_line_pointer = s;
expression (op);
if (op->X_op == O_absent)
as_bad (_("missing operand"));
return input_line_pointer;
}
int
md_estimate_size_before_relax (fragp, seg)
fragS *fragp ATTRIBUTE_UNUSED;
asection *seg ATTRIBUTE_UNUSED;
{
abort ();
return 0;
}
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