| /* |
| * 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> |
| /*@unused@*/ RCSID("$Id: lc3bbc.c,v 1.1.1.1 2012/03/29 17:21:01 uid42307 Exp $"); |
| |
| #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, |
| 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, |
| 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, 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; |
| |
| /* 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, 0, 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, 0, bc, 1, d)) |
| return 1; |
| break; |
| case LC3B_IMM_6_WORD: |
| insn->imm.size = 6; |
| if (output_value(&insn->imm, *bufp, 2, 0, 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, 0, bc, 1, d)) |
| return 1; |
| break; |
| case LC3B_IMM_8: |
| insn->imm.size = 8; |
| if (output_value(&insn->imm, *bufp, 2, 0, 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, 0, bc, 1, d)) |
| return 1; |
| break; |
| case LC3B_IMM_9: |
| insn->imm.size = 9; |
| if (output_value(&insn->imm, *bufp, 2, 0, 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; |
| } |
