1#!/usr/bin/env python3 2 3## 4## Copyright (c) 2024 Taylor Simpson <ltaylorsimpson@gmail.com> 5## 6## This program is free software; you can redistribute it and/or modify 7## it under the terms of the GNU General Public License as published by 8## the Free Software Foundation; either version 2 of the License, or 9## (at your option) any later version. 10## 11## This program is distributed in the hope that it will be useful, 12## but WITHOUT ANY WARRANTY; without even the implied warranty of 13## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14## GNU General Public License for more details. 15## 16## You should have received a copy of the GNU General Public License 17## along with this program; if not, see <http://www.gnu.org/licenses/>. 18## 19 20import io 21import re 22 23import sys 24import textwrap 25import iset 26import hex_common 27 28encs = { 29 tag: "".join(reversed(iset.iset[tag]["enc"].replace(" ", ""))) 30 for tag in iset.tags 31 if iset.iset[tag]["enc"] != "MISSING ENCODING" 32} 33 34 35regre = re.compile(r"((?<!DUP)[MNORCPQXSGVZA])([stuvwxyzdefg]+)([.]?[LlHh]?)(\d+S?)") 36immre = re.compile(r"[#]([rRsSuUm])(\d+)(?:[:](\d+))?") 37 38 39def ordered_unique(l): 40 return sorted(set(l), key=l.index) 41 42 43def code_fmt(txt): 44 return textwrap.indent(textwrap.dedent(txt), " ") 45 46open_curly = "{" 47close_curly = "}" 48 49def mark_which_imm_extended(f, tag): 50 immre = re.compile(r"IMMEXT\([rRsSuUm]") 51 imm = immre.findall(hex_common.semdict[tag]) 52 if len(imm) == 0: 53 # No extended operand found 54 return 55 letter = re.split("\\(", imm[0])[1] 56 f.write(code_fmt(f"""\ 57 insn->which_extended = {0 if letter.islower() else 1}; 58 """)) 59 60## 61## Generate the QEMU decodetree trans_<tag> function for each instruction 62## For A2_add: Rd32=add(Rs32,Rt32) 63## We produce: 64## static bool trans_A2_add(DisasContext *ctx, arg_A2_add *args) 65## { 66## Insn *insn = ctx->insn; 67## insn->opcode = A2_add; 68## insn->regno[0] = args->Rd; 69## insn->regno[1] = args->Rs; 70## insn->regno[2] = args->Rt; 71## insn->new_read_idx = -1; 72## insn->dest_idx = 0; 73## insn->has_pred_dest = false; 74## return true; 75## } 76## 77def gen_trans_funcs(f): 78 f.write(f"/* DO NOT MODIFY - This file is generated by {sys.argv[0]} */\n\n") 79 for tag in sorted(encs.keys(), key=iset.tags.index): 80 regs = ordered_unique(regre.findall(iset.iset[tag]["syntax"])) 81 imms = ordered_unique(immre.findall(iset.iset[tag]["syntax"])) 82 83 f.write(textwrap.dedent(f"""\ 84 static bool trans_{tag}(DisasContext *ctx, arg_{tag} *args) 85 {open_curly} 86 Insn *insn = ctx->insn; 87 insn->opcode = {tag}; 88 """)) 89 90 new_read_idx = -1 91 dest_idx = -1 92 dest_idx_reg_id = None 93 has_pred_dest = "false" 94 for regno, (reg_type, reg_id, *_) in enumerate(regs): 95 reg = hex_common.get_register(tag, reg_type, reg_id) 96 f.write(code_fmt(f"""\ 97 insn->regno[{regno}] = args->{reg_type}{reg_id}; 98 """)) 99 if reg.is_read() and reg.is_new(): 100 new_read_idx = regno 101 if reg.is_written(): 102 # dest_idx should be the first destination alphabetically 103 if dest_idx_reg_id is None or reg_id < dest_idx_reg_id: 104 dest_idx = regno 105 dest_idx_reg_id = reg_id 106 if reg_type == "P" and reg.is_written() and not reg.is_read(): 107 has_pred_dest = "true" 108 109 if len(imms) != 0: 110 mark_which_imm_extended(f, tag) 111 112 for imm in imms: 113 imm_type = imm[0] 114 imm_letter = "i" if imm_type.islower() else "I" 115 immno = 0 if imm_type.islower() else 1 116 imm_shift = int(imm[2]) if imm[2] else 0 117 if imm_shift: 118 f.write(code_fmt(f"""\ 119 insn->immed[{immno}] = 120 shift_left(ctx, args->{imm_type}{imm_letter}, 121 {imm_shift}, {immno}); 122 """)) 123 else: 124 f.write(code_fmt(f"""\ 125 insn->immed[{immno}] = args->{imm_type}{imm_letter}; 126 """)) 127 128 f.write(code_fmt(f"""\ 129 insn->new_read_idx = {new_read_idx}; 130 insn->dest_idx = {dest_idx}; 131 insn->has_pred_dest = {has_pred_dest}; 132 """)) 133 f.write(textwrap.dedent(f"""\ 134 return true; 135 {close_curly} 136 """)) 137 138 139if __name__ == "__main__": 140 hex_common.read_semantics_file(sys.argv[1]) 141 hex_common.init_registers() 142 with open(sys.argv[2], "w") as f: 143 gen_trans_funcs(f) 144