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/*
* LC-3b bytecode utility functions
*
* 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"
/* Bytecode callback function prototypes */
static void lc3b_bc_insn_destroy(void *contents);
static void lc3b_bc_insn_print(const void *contents, FILE *f,
int indent_level);
static int lc3b_bc_insn_calc_len(yasm_bytecode *bc,
yasm_bc_add_span_func add_span,
void *add_span_data);
static int lc3b_bc_insn_expand(yasm_bytecode *bc, int span, long old_val,
long new_val, /*@out@*/ long *neg_thres,
/*@out@*/ long *pos_thres);
static int lc3b_bc_insn_tobytes(yasm_bytecode *bc, unsigned char **bufp,
unsigned char *bufstart,
void *d, yasm_output_value_func output_value,
/*@null@*/ yasm_output_reloc_func output_reloc);
/* Bytecode callback structures */
static const yasm_bytecode_callback lc3b_bc_callback_insn = {
lc3b_bc_insn_destroy,
lc3b_bc_insn_print,
yasm_bc_finalize_common,
NULL,
lc3b_bc_insn_calc_len,
lc3b_bc_insn_expand,
lc3b_bc_insn_tobytes,
0
};
void
yasm_lc3b__bc_transform_insn(yasm_bytecode *bc, lc3b_insn *insn)
{
yasm_bc_transform(bc, &lc3b_bc_callback_insn, insn);
}
static void
lc3b_bc_insn_destroy(void *contents)
{
lc3b_insn *insn = (lc3b_insn *)contents;
yasm_value_delete(&insn->imm);
yasm_xfree(contents);
}
static void
lc3b_bc_insn_print(const void *contents, FILE *f, int indent_level)
{
const lc3b_insn *insn = (const lc3b_insn *)contents;
fprintf(f, "%*s_Instruction_\n", indent_level, "");
fprintf(f, "%*sImmediate Value:", indent_level, "");
if (!insn->imm.abs)
fprintf(f, " (nil)\n");
else {
indent_level++;
fprintf(f, "\n");
yasm_value_print(&insn->imm, f, indent_level);
fprintf(f, "%*sType=", indent_level, "");
switch (insn->imm_type) {
case LC3B_IMM_NONE:
fprintf(f, "NONE-SHOULDN'T HAPPEN");
break;
case LC3B_IMM_4:
fprintf(f, "4-bit");
break;
case LC3B_IMM_5:
fprintf(f, "5-bit");
break;
case LC3B_IMM_6_WORD:
fprintf(f, "6-bit, word-multiple");
break;
case LC3B_IMM_6_BYTE:
fprintf(f, "6-bit, byte-multiple");
break;
case LC3B_IMM_8:
fprintf(f, "8-bit, word-multiple");
break;
case LC3B_IMM_9:
fprintf(f, "9-bit, signed, word-multiple");
break;
case LC3B_IMM_9_PC:
fprintf(f, "9-bit, signed, word-multiple, PC-relative");
break;
}
indent_level--;
}
/* FIXME
fprintf(f, "\n%*sOrigin=", indent_level, "");
if (insn->origin) {
fprintf(f, "\n");
yasm_symrec_print(insn->origin, f, indent_level+1);
} else
fprintf(f, "(nil)\n");
*/
fprintf(f, "%*sOpcode: %04x\n", indent_level, "",
(unsigned int)insn->opcode);
}
static int
lc3b_bc_insn_calc_len(yasm_bytecode *bc, yasm_bc_add_span_func add_span,
void *add_span_data)
{
lc3b_insn *insn = (lc3b_insn *)bc->contents;
yasm_bytecode *target_prevbc;
/* Fixed size instruction length */
bc->len += 2;
/* Only need to worry about out-of-range to PC-relative */
if (insn->imm_type != LC3B_IMM_9_PC)
return 0;
if (insn->imm.rel
&& (!yasm_symrec_get_label(insn->imm.rel, &target_prevbc)
|| target_prevbc->section != bc->section)) {
/* External or out of segment, so we can't check distance. */
return 0;
}
/* 9-bit signed, word-multiple displacement */
add_span(add_span_data, bc, 1, &insn->imm, -512+(long)bc->len,
511+(long)bc->len);
return 0;
}
static int
lc3b_bc_insn_expand(yasm_bytecode *bc, int span, long old_val, long new_val,
/*@out@*/ long *neg_thres, /*@out@*/ long *pos_thres)
{
yasm_error_set(YASM_ERROR_VALUE, N_("jump target out of range"));
return -1;
}
static int
lc3b_bc_insn_tobytes(yasm_bytecode *bc, unsigned char **bufp,
unsigned char *bufstart, void *d,
yasm_output_value_func output_value,
/*@unused@*/ yasm_output_reloc_func output_reloc)
{
lc3b_insn *insn = (lc3b_insn *)bc->contents;
/*@only@*/ yasm_intnum *delta;
unsigned long buf_off = (unsigned long)(*bufp - bufstart);
/* Output opcode */
YASM_SAVE_16_L(*bufp, insn->opcode);
/* Insert immediate into opcode. */
switch (insn->imm_type) {
case LC3B_IMM_NONE:
break;
case LC3B_IMM_4:
insn->imm.size = 4;
if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 1, d))
return 1;
break;
case LC3B_IMM_5:
insn->imm.size = 5;
insn->imm.sign = 1;
if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 1, d))
return 1;
break;
case LC3B_IMM_6_WORD:
insn->imm.size = 6;
if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 1, d))
return 1;
break;
case LC3B_IMM_6_BYTE:
insn->imm.size = 6;
insn->imm.sign = 1;
if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 1, d))
return 1;
break;
case LC3B_IMM_8:
insn->imm.size = 8;
if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 1, d))
return 1;
break;
case LC3B_IMM_9_PC:
/* Adjust relative displacement to end of bytecode */
delta = yasm_intnum_create_int(-1);
if (!insn->imm.abs)
insn->imm.abs = yasm_expr_create_ident(yasm_expr_int(delta),
bc->line);
else
insn->imm.abs =
yasm_expr_create(YASM_EXPR_ADD,
yasm_expr_expr(insn->imm.abs),
yasm_expr_int(delta), bc->line);
insn->imm.size = 9;
insn->imm.sign = 1;
if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 1, d))
return 1;
break;
case LC3B_IMM_9:
insn->imm.size = 9;
if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 1, d))
return 1;
break;
default:
yasm_internal_error(N_("Unrecognized immediate type"));
}
*bufp += 2; /* all instructions are 2 bytes in size */
return 0;
}
int
yasm_lc3b__intnum_tobytes(yasm_arch *arch, const yasm_intnum *intn,
unsigned char *buf, size_t destsize, size_t valsize,
int shift, const yasm_bytecode *bc, int warn)
{
/* Write value out. */
yasm_intnum_get_sized(intn, buf, destsize, valsize, shift, 0, warn);
return 0;
}
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