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242 lines
7.2 KiB
242 lines
7.2 KiB
/* |
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* LC-3b bytecode utility functions |
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* |
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* Copyright (C) 2003 Peter Johnson |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND OTHER CONTRIBUTORS ``AS IS'' |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR OTHER CONTRIBUTORS BE |
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include <util.h> |
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/*@unused@*/ RCSID("$Id$"); |
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#define YASM_LIB_INTERNAL |
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#define YASM_BC_INTERNAL |
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#include <libyasm.h> |
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#include "lc3barch.h" |
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/* Bytecode callback function prototypes */ |
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static void lc3b_bc_insn_destroy(void *contents); |
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static void lc3b_bc_insn_print(const void *contents, FILE *f, |
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int indent_level); |
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static yasm_bc_resolve_flags lc3b_bc_insn_resolve |
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(yasm_bytecode *bc, int save, yasm_calc_bc_dist_func calc_bc_dist); |
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static int lc3b_bc_insn_tobytes(yasm_bytecode *bc, unsigned char **bufp, |
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void *d, yasm_output_expr_func output_expr, |
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/*@null@*/ yasm_output_reloc_func output_reloc); |
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/* Bytecode callback structures */ |
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static const yasm_bytecode_callback lc3b_bc_callback_insn = { |
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lc3b_bc_insn_destroy, |
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lc3b_bc_insn_print, |
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yasm_bc_finalize_common, |
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lc3b_bc_insn_resolve, |
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lc3b_bc_insn_tobytes |
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}; |
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void |
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yasm_lc3b__bc_transform_insn(yasm_bytecode *bc, lc3b_insn *insn) |
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{ |
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yasm_bc_transform(bc, &lc3b_bc_callback_insn, insn); |
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} |
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static void |
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lc3b_bc_insn_destroy(void *contents) |
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{ |
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lc3b_insn *insn = (lc3b_insn *)contents; |
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if (insn->imm) |
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yasm_expr_destroy(insn->imm); |
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yasm_xfree(contents); |
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} |
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static void |
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lc3b_bc_insn_print(const void *contents, FILE *f, int indent_level) |
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{ |
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const lc3b_insn *insn = (const lc3b_insn *)contents; |
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fprintf(f, "%*s_Instruction_\n", indent_level, ""); |
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fprintf(f, "%*sImmediate Value:", indent_level, ""); |
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if (!insn->imm) |
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fprintf(f, " (nil)\n"); |
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else { |
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indent_level++; |
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fprintf(f, "\n%*sVal=", indent_level, ""); |
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yasm_expr_print(insn->imm, f); |
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fprintf(f, "\n%*sType=", indent_level, ""); |
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switch (insn->imm_type) { |
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case LC3B_IMM_NONE: |
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fprintf(f, "NONE-SHOULDN'T HAPPEN"); |
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break; |
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case LC3B_IMM_4: |
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fprintf(f, "4-bit"); |
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break; |
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case LC3B_IMM_5: |
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fprintf(f, "5-bit"); |
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break; |
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case LC3B_IMM_6_WORD: |
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fprintf(f, "6-bit, word-multiple"); |
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break; |
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case LC3B_IMM_6_BYTE: |
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fprintf(f, "6-bit, byte-multiple"); |
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break; |
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case LC3B_IMM_8: |
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fprintf(f, "8-bit, word-multiple"); |
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break; |
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case LC3B_IMM_9: |
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fprintf(f, "9-bit, signed, word-multiple"); |
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break; |
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case LC3B_IMM_9_PC: |
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fprintf(f, "9-bit, signed, word-multiple, PC-relative"); |
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break; |
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} |
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indent_level--; |
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} |
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fprintf(f, "\n%*sOrigin=", indent_level, ""); |
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if (insn->origin) { |
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fprintf(f, "\n"); |
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yasm_symrec_print(insn->origin, f, indent_level+1); |
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} else |
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fprintf(f, "(nil)\n"); |
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fprintf(f, "%*sOpcode: %04x\n", indent_level, "", |
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(unsigned int)insn->opcode); |
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} |
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static yasm_bc_resolve_flags |
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lc3b_bc_insn_resolve(yasm_bytecode *bc, int save, |
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yasm_calc_bc_dist_func calc_bc_dist) |
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{ |
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lc3b_insn *insn = (lc3b_insn *)bc->contents; |
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/*@null@*/ yasm_expr *temp; |
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/*@dependent@*/ /*@null@*/ const yasm_intnum *num; |
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long rel; |
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/* Fixed size instruction length */ |
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bc->len = 2; |
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/* Only need to worry about out-of-range to PC-relative, and only if we're |
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* saving. |
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*/ |
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if (insn->imm_type != LC3B_IMM_9_PC || !save) |
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return YASM_BC_RESOLVE_MIN_LEN; |
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temp = yasm_expr_copy(insn->imm); |
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temp = yasm_expr_create(YASM_EXPR_SUB, yasm_expr_expr(temp), |
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yasm_expr_sym(insn->origin), bc->line); |
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num = yasm_expr_get_intnum(&temp, calc_bc_dist); |
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if (!num) { |
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yasm__error(bc->line, N_("target external or out of segment")); |
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yasm_expr_destroy(temp); |
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return YASM_BC_RESOLVE_ERROR | YASM_BC_RESOLVE_UNKNOWN_LEN; |
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} |
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rel = yasm_intnum_get_int(num); |
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rel -= 2; |
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yasm_expr_destroy(temp); |
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/* 9-bit signed, word-multiple displacement */ |
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if (rel < -512 || rel > 511) { |
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yasm__error(bc->line, N_("target out of range")); |
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return YASM_BC_RESOLVE_ERROR | YASM_BC_RESOLVE_UNKNOWN_LEN; |
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} |
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return YASM_BC_RESOLVE_MIN_LEN; |
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} |
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static int |
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lc3b_bc_insn_tobytes(yasm_bytecode *bc, unsigned char **bufp, void *d, |
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yasm_output_expr_func output_expr, |
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/*@unused@*/ yasm_output_reloc_func output_reloc) |
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{ |
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lc3b_insn *insn = (lc3b_insn *)bc->contents; |
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/* Output opcode */ |
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YASM_SAVE_16_L(*bufp, insn->opcode); |
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/* Insert immediate into opcode. */ |
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switch (insn->imm_type) { |
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case LC3B_IMM_NONE: |
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break; |
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case LC3B_IMM_4: |
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if (output_expr(&insn->imm, *bufp, 2, 4, 0, 0, bc, 0, 1, d)) |
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return 1; |
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break; |
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case LC3B_IMM_5: |
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if (output_expr(&insn->imm, *bufp, 2, 5, 0, 0, bc, 0, 1, d)) |
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return 1; |
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break; |
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case LC3B_IMM_6_WORD: |
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if (output_expr(&insn->imm, *bufp, 2, 6, -1, 0, bc, 0, 1, d)) |
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return 1; |
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break; |
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case LC3B_IMM_6_BYTE: |
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if (output_expr(&insn->imm, *bufp, 2, 6, 0, 0, bc, 0, 1, d)) |
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return 1; |
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break; |
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case LC3B_IMM_8: |
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if (output_expr(&insn->imm, *bufp, 2, 8, -1, 0, bc, 0, 1, d)) |
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return 1; |
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break; |
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case LC3B_IMM_9_PC: |
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insn->imm = yasm_expr_create(YASM_EXPR_SUB, |
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yasm_expr_expr(insn->imm), yasm_expr_sym(insn->origin), |
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bc->line); |
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if (output_expr(&insn->imm, *bufp, 2, 9, -1, 0, bc, 1, 1, d)) |
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return 1; |
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break; |
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case LC3B_IMM_9: |
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if (output_expr(&insn->imm, *bufp, 2, 9, -1, 0, bc, 0, 1, d)) |
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return 1; |
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break; |
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default: |
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yasm_internal_error(N_("Unrecognized immediate type")); |
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} |
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*bufp += 2; /* all instructions are 2 bytes in size */ |
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return 0; |
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} |
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int |
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yasm_lc3b__intnum_fixup_rel(yasm_arch *arch, yasm_intnum *intn, |
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size_t valsize, const yasm_bytecode *bc, |
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unsigned long line) |
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{ |
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yasm_intnum *delta; |
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if (valsize != 9) |
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yasm_internal_error( |
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N_("tried to do PC-relative offset from invalid sized value")); |
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delta = yasm_intnum_create_uint(bc->len); |
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yasm_intnum_calc(intn, YASM_EXPR_SUB, delta, line); |
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yasm_intnum_destroy(delta); |
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return 0; |
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} |
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int |
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yasm_lc3b__intnum_tobytes(yasm_arch *arch, const yasm_intnum *intn, |
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unsigned char *buf, size_t destsize, size_t valsize, |
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int shift, const yasm_bytecode *bc, int warn, |
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unsigned long line) |
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{ |
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/* Write value out. */ |
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yasm_intnum_get_sized(intn, buf, destsize, valsize, shift, 0, warn, |
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line); |
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return 0; |
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}
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