/* DO NOT EDIT! -*- buffer-read-only: t -*- vi:set ro: */
/* Assembler interface for targets using CGEN. -*- C -*-
CGEN: Cpu tools GENerator
THIS FILE IS MACHINE GENERATED WITH CGEN.
- the resultant file is machine generated, cgen-asm.in isn't
Copyright (C) 1996-2024 Free Software Foundation, Inc.
This file is part of libopcodes.
This library 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.
It 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 this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
/* ??? Eventually more and more of this stuff can go to cpu-independent files.
Keep that in mind. */
/* Check here to see if you're about to try parsing a w as the first arg
and return an error if you are. */
if ((strncmp (*strp, "w", 1) == 0) || (strncmp (*strp, "W", 1) == 0))
{
(*strp)++;
if ((strncmp (*strp, ",", 1) == 0) || ISSPACE (**strp))
{
/* We've been passed a w. Return with an error message so that
cgen will try the next parsing option. */
errmsg = _("W keyword invalid in FR operand slot.");
return errmsg;
}
*strp = old_strp;
}
/* Attempt to parse for "(IP)". */
afteroffset = strstr (*strp, "(IP)");
if (afteroffset == NULL)
/* Make sure it's not in lower case. */
afteroffset = strstr (*strp, "(ip)");
if (afteroffset != NULL)
{
if (afteroffset != *strp)
{
/* Invalid offset present. */
errmsg = _("offset(IP) is not a valid form");
return errmsg;
}
else
{
*strp += 4;
*valuep = 0;
errmsg = NULL;
return errmsg;
}
}
/* Attempt to parse for DP. ex: mov w, offset(DP)
mov offset(DP),w */
/* Try parsing it as an address and see what comes back. */
afteroffset = strstr (*strp, "(DP)");
if (afteroffset == NULL)
/* Maybe it's in lower case. */
afteroffset = strstr (*strp, "(dp)");
if (afteroffset != NULL)
{
if (afteroffset == *strp)
{
/* No offset present. Use 0 by default. */
tempvalue = 0;
errmsg = NULL;
}
else
errmsg = cgen_parse_address (cd, strp, opindex,
BFD_RELOC_IP2K_FR_OFFSET,
& result_type, & tempvalue);
if (errmsg == NULL)
{
if (tempvalue <= 127)
{
/* Value is ok. Fix up the first 2 bits and return. */
*valuep = 0x0100 | tempvalue;
*strp += 4; /* Skip over the (DP) in *strp. */
return errmsg;
}
else
{
/* Found something there in front of (DP) but it's out
of range. */
errmsg = _("(DP) offset out of range.");
return errmsg;
}
}
}
/* Attempt to parse for SP. ex: mov w, offset(SP)
mov offset(SP), w. */
afteroffset = strstr (*strp, "(SP)");
if (afteroffset == NULL)
/* Maybe it's in lower case. */
afteroffset = strstr (*strp, "(sp)");
if (afteroffset != NULL)
{
if (afteroffset == *strp)
{
/* No offset present. Use 0 by default. */
tempvalue = 0;
errmsg = NULL;
}
else
errmsg = cgen_parse_address (cd, strp, opindex,
BFD_RELOC_IP2K_FR_OFFSET,
& result_type, & tempvalue);
if (errmsg == NULL)
{
if (tempvalue <= 127)
{
/* Value is ok. Fix up the first 2 bits and return. */
*valuep = 0x0180 | tempvalue;
*strp += 4; /* Skip over the (SP) in *strp. */
return errmsg;
}
else
{
/* Found something there in front of (SP) but it's out
of range. */
errmsg = _("(SP) offset out of range.");
return errmsg;
}
}
}
/* Attempt to parse as an address. */
*strp = old_strp;
errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IP2K_FR9,
& result_type, & value);
if (errmsg == NULL)
{
*valuep = value;
/* If a parenthesis is found, warn about invalid form. */
if (**strp == '(')
errmsg = _("illegal use of parentheses");
/* If a numeric value is specified, ensure that it is between
1 and 255. */
else if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
{
if (value < 0x1 || value > 0xff)
errmsg = _("operand out of range (not between 1 and 255)");
}
}
return errmsg;
}
if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16H)
code = BFD_RELOC_IP2K_HI8DATA;
else if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16L)
code = BFD_RELOC_IP2K_LO8DATA;
else
{
/* Something is very wrong. opindex has to be one of the above. */
errmsg = _("parse_addr16: invalid opindex.");
return errmsg;
}
errmsg = cgen_parse_address (cd, strp, opindex, code,
& result_type, & value);
if (errmsg == NULL)
{
/* We either have a relocation or a number now. */
if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
{
/* We got a number back. */
if (code == BFD_RELOC_IP2K_HI8DATA)
value >>= 8;
else
/* code = BFD_RELOC_IP2K_LOW8DATA. */
value &= 0x00FF;
}
*valuep = value;
}
if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16CJP)
code = BFD_RELOC_IP2K_ADDR16CJP;
else if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16P)
code = BFD_RELOC_IP2K_PAGE3;
errmsg = cgen_parse_address (cd, strp, opindex, code,
& result_type, & value);
if (errmsg == NULL)
{
if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
{
if ((value & 0x1) == 0) /* If the address is even .... */
{
if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16CJP)
*valuep = (value >> 1) & 0x1FFF; /* Should mask be 1FFF? */
else if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16P)
*valuep = (value >> 14) & 0x7;
}
else
errmsg = _("Byte address required. - must be even.");
}
else if (result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED)
{
/* This will happen for things like (s2-s1) where s2 and s1
are labels. */
*valuep = value;
}
else
errmsg = _("cgen_parse_address returned a symbol. Literal required.");
}
return errmsg;
}
This function is basically just a big switch statement. Earlier versions
used tables to look up the function to use, but
- if the table contains both assembler and disassembler functions then
the disassembler contains much of the assembler and vice-versa,
- there's a lot of inlining possibilities as things grow,
- using a switch statement avoids the function call overhead.
This function could be moved into `parse_insn_normal', but keeping it
separate makes clear the interface between `parse_insn_normal' and each of
the handlers. */
const char *
ip2k_cgen_parse_operand (CGEN_CPU_DESC cd,
int opindex,
const char ** strp,
CGEN_FIELDS * fields)
{
const char * errmsg = NULL;
/* Used by scalar operands that still need to be parsed. */
long junk ATTRIBUTE_UNUSED;
switch (opindex)
{
case IP2K_OPERAND_ADDR16CJP :
errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16CJP, (unsigned long *) (& fields->f_addr16cjp));
break;
case IP2K_OPERAND_ADDR16H :
errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16H, (unsigned long *) (& fields->f_imm8));
break;
case IP2K_OPERAND_ADDR16L :
errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16L, (unsigned long *) (& fields->f_imm8));
break;
case IP2K_OPERAND_ADDR16P :
errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16P, (unsigned long *) (& fields->f_page3));
break;
case IP2K_OPERAND_BITNO :
errmsg = parse_bit3 (cd, strp, IP2K_OPERAND_BITNO, (unsigned long *) (& fields->f_bitno));
break;
case IP2K_OPERAND_CBIT :
errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_CBIT, (unsigned long *) (& junk));
break;
case IP2K_OPERAND_DCBIT :
errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_DCBIT, (unsigned long *) (& junk));
break;
case IP2K_OPERAND_FR :
errmsg = parse_fr (cd, strp, IP2K_OPERAND_FR, (unsigned long *) (& fields->f_reg));
break;
case IP2K_OPERAND_LIT8 :
errmsg = parse_lit8 (cd, strp, IP2K_OPERAND_LIT8, (long *) (& fields->f_imm8));
break;
case IP2K_OPERAND_PABITS :
errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_PABITS, (unsigned long *) (& junk));
break;
case IP2K_OPERAND_RETI3 :
errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_RETI3, (unsigned long *) (& fields->f_reti3));
break;
case IP2K_OPERAND_ZBIT :
errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_ZBIT, (unsigned long *) (& junk));
break;
default :
/* xgettext:c-format */
opcodes_error_handler
(_("internal error: unrecognized field %d while parsing"),
opindex);
abort ();
}
syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
/* Mnemonics come first in the syntax string. */
if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
return _("missing mnemonic in syntax string");
++syn;
/* Generate a case sensitive regular expression that emulates case
insensitive matching in the "C" locale. We cannot generate a case
insensitive regular expression because in Turkish locales, 'i' and 'I'
are not equal modulo case conversion. */
/* Copy the literal mnemonic out of the insn. */
for (; *mnem; mnem++)
{
char c = *mnem;
/* Copy any remaining literals from the syntax string into the rx. */
for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
{
if (CGEN_SYNTAX_CHAR_P (* syn))
{
char c = CGEN_SYNTAX_CHAR (* syn);
switch (c)
{
/* Escape any regex metacharacters in the syntax. */
case '.': case '[': case '\\':
case '*': case '^': case '$':
#ifdef CGEN_ESCAPE_EXTENDED_REGEX
case '?': case '{': case '}':
case '(': case ')': case '*':
case '|': case '+': case ']':
#endif
*rx++ = '\\';
*rx++ = c;
break;
The syntax string is scanned and operands are parsed and stored in FIELDS.
Relocs are queued as we go via other callbacks.
??? Note that this is currently an all-or-nothing parser. If we fail to
parse the instruction, we return 0 and the caller will start over from
the beginning. Backtracking will be necessary in parsing subexpressions,
but that can be handled there. Not handling backtracking here may get
expensive in the case of the m68k. Deal with later.
Returns NULL for success, an error message for failure. */
/* For now we assume the mnemonic is first (there are no leading operands).
We can parse it without needing to set up operand parsing.
GAS's input scrubber will ensure mnemonics are lowercase, but we may
not be called from GAS. */
p = CGEN_INSN_MNEMONIC (insn);
while (*p && TOLOWER (*p) == TOLOWER (*str))
++p, ++str;
/* We don't check for (*str != '\0') here because we want to parse
any trailing fake arguments in the syntax string. */
syn = CGEN_SYNTAX_STRING (syntax);
/* Mnemonics come first for now, ensure valid string. */
if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
abort ();
++syn;
while (* syn != 0)
{
/* Non operand chars must match exactly. */
if (CGEN_SYNTAX_CHAR_P (* syn))
{
/* FIXME: While we allow for non-GAS callers above, we assume the
first char after the mnemonic part is a space. */
/* FIXME: We also take inappropriate advantage of the fact that
GAS's input scrubber will remove extraneous blanks. */
if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
{
#ifdef CGEN_MNEMONIC_OPERANDS
if (CGEN_SYNTAX_CHAR(* syn) == ' ')
past_opcode_p = 1;
#endif
++ syn;
++ str;
}
else if (*str)
{
/* Syntax char didn't match. Can't be this insn. */
static char msg [80];
/* xgettext:c-format */
sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
CGEN_SYNTAX_CHAR(*syn), *str);
return msg;
}
else
{
/* Ran out of input. */
static char msg [80];
/* xgettext:c-format */
sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
CGEN_SYNTAX_CHAR(*syn));
return msg;
}
continue;
}
#ifdef CGEN_MNEMONIC_OPERANDS
(void) past_opcode_p;
#endif
/* We have an operand of some sort. */
errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
if (errmsg)
return errmsg;
/* Done with this operand, continue with next one. */
++ syn;
}
/* If we're at the end of the syntax string, we're done. */
if (* syn == 0)
{
/* FIXME: For the moment we assume a valid `str' can only contain
blanks now. IE: We needn't try again with a longer version of
the insn and it is assumed that longer versions of insns appear
before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
while (ISSPACE (* str))
++ str;
if (* str != '\0')
return _("junk at end of line"); /* FIXME: would like to include `str' */
return NULL;
}
/* We couldn't parse it. */
return _("unrecognized instruction");
}
/* Main entry point.
This routine is called for each instruction to be assembled.
STR points to the insn to be assembled.
We assume all necessary tables have been initialized.
The assembled instruction, less any fixups, is stored in BUF.
Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
still needs to be converted to target byte order, otherwise BUF is an array
of bytes in target byte order.
The result is a pointer to the insn's entry in the opcode table,
or NULL if an error occured (an error message will have already been
printed).
Note that when processing (non-alias) macro-insns,
this function recurses.
??? It's possible to make this cpu-independent.
One would have to deal with a few minor things.
At this point in time doing so would be more of a curiosity than useful
[for example this file isn't _that_ big], but keeping the possibility in
mind helps keep the design clean. */
/* Skip leading white space. */
while (ISSPACE (* str))
++ str;
/* The instructions are stored in hashed lists.
Get the first in the list. */
ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
/* Keep looking until we find a match. */
start = str;
for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
{
const CGEN_INSN *insn = ilist->insn;
recognized_mnemonic = 1;
#ifdef CGEN_VALIDATE_INSN_SUPPORTED
/* Not usually needed as unsupported opcodes
shouldn't be in the hash lists. */
/* Is this insn supported by the selected cpu? */
if (! ip2k_cgen_insn_supported (cd, insn))
continue;
#endif
/* If the RELAXED attribute is set, this is an insn that shouldn't be
chosen immediately. Instead, it is used during assembler/linker
relaxation if possible. */
if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
continue;
str = start;
/* Skip this insn if str doesn't look right lexically. */
if (CGEN_INSN_RX (insn) != NULL &&
regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
continue;
/* Allow parse/insert handlers to obtain length of insn. */
CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
