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249 lines
8.4 KiB
249 lines
8.4 KiB
/* |
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* LC-3b bytecode utility functions |
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* |
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* Copyright (C) 2003-2007 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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#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 int lc3b_bc_insn_calc_len(yasm_bytecode *bc, |
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yasm_bc_add_span_func add_span, |
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void *add_span_data); |
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static int lc3b_bc_insn_expand(yasm_bytecode *bc, int span, long old_val, |
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long new_val, /*@out@*/ long *neg_thres, |
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/*@out@*/ long *pos_thres); |
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static int lc3b_bc_insn_tobytes(yasm_bytecode *bc, unsigned char **bufp, |
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unsigned char *bufstart, |
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void *d, yasm_output_value_func output_value, |
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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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NULL, |
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lc3b_bc_insn_calc_len, |
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lc3b_bc_insn_expand, |
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lc3b_bc_insn_tobytes, |
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0 |
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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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yasm_value_delete(&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.abs) |
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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"); |
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yasm_value_print(&insn->imm, f, indent_level); |
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fprintf(f, "%*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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/* FIXME |
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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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*/ |
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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 int |
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lc3b_bc_insn_calc_len(yasm_bytecode *bc, yasm_bc_add_span_func add_span, |
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void *add_span_data) |
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{ |
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lc3b_insn *insn = (lc3b_insn *)bc->contents; |
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yasm_bytecode *target_prevbc; |
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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 */ |
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if (insn->imm_type != LC3B_IMM_9_PC) |
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return 0; |
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if (insn->imm.rel |
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&& (!yasm_symrec_get_label(insn->imm.rel, &target_prevbc) |
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|| target_prevbc->section != bc->section)) { |
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/* External or out of segment, so we can't check distance. */ |
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return 0; |
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} |
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/* 9-bit signed, word-multiple displacement */ |
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add_span(add_span_data, bc, 1, &insn->imm, -512+(long)bc->len, |
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511+(long)bc->len); |
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return 0; |
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} |
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static int |
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lc3b_bc_insn_expand(yasm_bytecode *bc, int span, long old_val, long new_val, |
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/*@out@*/ long *neg_thres, /*@out@*/ long *pos_thres) |
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{ |
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yasm_error_set(YASM_ERROR_VALUE, N_("jump target out of range")); |
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return -1; |
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} |
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static int |
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lc3b_bc_insn_tobytes(yasm_bytecode *bc, unsigned char **bufp, |
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unsigned char *bufstart, void *d, |
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yasm_output_value_func output_value, |
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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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/*@only@*/ yasm_intnum *delta; |
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unsigned long buf_off = (unsigned long)(*bufp - bufstart); |
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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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insn->imm.size = 4; |
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if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 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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insn->imm.size = 5; |
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insn->imm.sign = 1; |
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if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 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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insn->imm.size = 6; |
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if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 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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insn->imm.size = 6; |
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insn->imm.sign = 1; |
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if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 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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insn->imm.size = 8; |
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if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 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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/* Adjust relative displacement to end of bytecode */ |
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delta = yasm_intnum_create_int(-1); |
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if (!insn->imm.abs) |
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insn->imm.abs = yasm_expr_create_ident(yasm_expr_int(delta), |
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bc->line); |
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else |
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insn->imm.abs = |
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yasm_expr_create(YASM_EXPR_ADD, |
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yasm_expr_expr(insn->imm.abs), |
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yasm_expr_int(delta), bc->line); |
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insn->imm.size = 9; |
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insn->imm.sign = 1; |
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if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 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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insn->imm.size = 9; |
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if (output_value(&insn->imm, *bufp, 2, buf_off, bc, 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_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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{ |
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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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return 0; |
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}
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