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/*
* LC-3b architecture description
*
* Copyright (C) 2003-2007 Peter Johnson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND OTHER CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR OTHER CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <util.h>
#include <libyasm.h>
#include "lc3barch.h"
yasm_arch_module yasm_lc3b_LTX_arch;
static /*@only@*/ yasm_arch *
lc3b_create(const char *machine, const char *parser,
/*@out@*/ yasm_arch_create_error *error)
{
yasm_arch_base *arch;
*error = YASM_ARCH_CREATE_OK;
if (yasm__strcasecmp(machine, "lc3b") != 0) {
*error = YASM_ARCH_CREATE_BAD_MACHINE;
return NULL;
}
if (yasm__strcasecmp(parser, "nasm") != 0) {
*error = YASM_ARCH_CREATE_BAD_PARSER;
return NULL;
}
arch = yasm_xmalloc(sizeof(yasm_arch_base));
arch->module = &yasm_lc3b_LTX_arch;
return (yasm_arch *)arch;
}
static void
lc3b_destroy(/*@only@*/ yasm_arch *arch)
{
yasm_xfree(arch);
}
static const char *
lc3b_get_machine(/*@unused@*/ const yasm_arch *arch)
{
return "lc3b";
}
static unsigned int
lc3b_get_address_size(/*@unused@*/ const yasm_arch *arch)
{
return 16;
}
static int
lc3b_set_var(yasm_arch *arch, const char *var, unsigned long val)
{
return 1;
}
static const unsigned char **
lc3b_get_fill(const yasm_arch *arch)
{
/* NOP pattern is all 0's per LC-3b Assembler 3.50 output */
static const unsigned char *fill[16] = {
NULL, /* unused */
NULL, /* 1 - illegal; all opcodes are 2 bytes long */
(const unsigned char *)
"\x00\x00", /* 4 */
NULL, /* 3 - illegal */
(const unsigned char *)
"\x00\x00\x00\x00", /* 4 */
NULL, /* 5 - illegal */
(const unsigned char *)
"\x00\x00\x00\x00\x00\x00", /* 6 */
NULL, /* 7 - illegal */
(const unsigned char *)
"\x00\x00\x00\x00\x00\x00" /* 8 */
"\x00\x00",
NULL, /* 9 - illegal */
(const unsigned char *)
"\x00\x00\x00\x00\x00\x00" /* 10 */
"\x00\x00\x00\x00",
NULL, /* 11 - illegal */
(const unsigned char *)
"\x00\x00\x00\x00\x00\x00" /* 12 */
"\x00\x00\x00\x00\x00\x00",
NULL, /* 13 - illegal */
(const unsigned char *)
"\x00\x00\x00\x00\x00\x00" /* 14 */
"\x00\x00\x00\x00\x00\x00\x00\x00",
NULL /* 15 - illegal */
};
return fill;
}
static unsigned int
lc3b_get_reg_size(/*@unused@*/ yasm_arch *arch, /*@unused@*/ uintptr_t reg)
{
return 16;
}
static uintptr_t
lc3b_reggroup_get_reg(/*@unused@*/ yasm_arch *arch,
/*@unused@*/ uintptr_t reggroup,
/*@unused@*/ unsigned long regindex)
{
return 0;
}
static void
lc3b_reg_print(/*@unused@*/ yasm_arch *arch, uintptr_t reg, FILE *f)
{
fprintf(f, "r%u", (unsigned int)(reg&7));
}
static int
lc3b_floatnum_tobytes(yasm_arch *arch, const yasm_floatnum *flt,
unsigned char *buf, size_t destsize, size_t valsize,
size_t shift, int warn)
{
yasm_error_set(YASM_ERROR_FLOATING_POINT,
N_("LC-3b does not support floating point"));
return 1;
}
static yasm_effaddr *
lc3b_ea_create_expr(yasm_arch *arch, yasm_expr *e)
{
yasm_effaddr *ea = yasm_xmalloc(sizeof(yasm_effaddr));
yasm_value_initialize(&ea->disp, e, 0);
ea->need_nonzero_len = 0;
ea->need_disp = 1;
ea->nosplit = 0;
ea->strong = 0;
ea->segreg = 0;
ea->pc_rel = 0;
ea->not_pc_rel = 0;
return ea;
}
void
yasm_lc3b__ea_destroy(/*@only@*/ yasm_effaddr *ea)
{
yasm_value_delete(&ea->disp);
yasm_xfree(ea);
}
static void
lc3b_ea_print(const yasm_effaddr *ea, FILE *f, int indent_level)
{
fprintf(f, "%*sDisp:\n", indent_level, "");
yasm_value_print(&ea->disp, f, indent_level+1);
}
/* Define lc3b machines -- see arch.h for details */
static yasm_arch_machine lc3b_machines[] = {
{ "LC-3b", "lc3b" },
{ NULL, NULL }
};
/* Define arch structure -- see arch.h for details */
yasm_arch_module yasm_lc3b_LTX_arch = {
"LC-3b",
"lc3b",
NULL,
lc3b_create,
lc3b_destroy,
lc3b_get_machine,
lc3b_get_address_size,
lc3b_set_var,
yasm_lc3b__parse_check_insnprefix,
yasm_lc3b__parse_check_regtmod,
lc3b_get_fill,
lc3b_floatnum_tobytes,
yasm_lc3b__intnum_tobytes,
lc3b_get_reg_size,
lc3b_reggroup_get_reg,
lc3b_reg_print,
NULL, /*yasm_lc3b__segreg_print*/
lc3b_ea_create_expr,
yasm_lc3b__ea_destroy,
lc3b_ea_print,
yasm_lc3b__create_empty_insn,
lc3b_machines,
"lc3b",
16,
2
};
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