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53 lines
1.6 KiB
Plaintext
53 lines
1.6 KiB
Plaintext
// Copyright Jamie Iles, 2018
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//
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// This file is part of s80x86.
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//
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// s80x86 is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// s80x86 is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with s80x86. If not, see <http://www.gnu.org/licenses/>.
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function logic insn_has_modrm;
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input logic [7:0] opcode;
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casez (opcode)
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<%#modrm_opcodes%>
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<%opc%>: insn_has_modrm = 1'b1;
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<%/modrm_opcodes%>
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default: insn_has_modrm = 1'b0;
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endcase
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endfunction
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function logic [1:0] insn_immed_count;
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input logic [7:0] opcode;
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input logic [2:0] modrm_reg;
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unique casez ({opcode, modrm_reg})
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<%#instructions%>
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{<%opcode%>, <%reg%>}: insn_immed_count = 2'd<%immediate_count%>;
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<%/instructions%>
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default: insn_immed_count = 2'b0;
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endcase
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endfunction
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function logic insn_immed_is_8bit;
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input logic [7:0] opcode;
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input logic [2:0] modrm_reg;
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input logic immed_num;
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unique casez ({opcode, modrm_reg})
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<%#instructions%>
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{<%opcode%>, <%reg%>}: insn_immed_is_8bit = ~|(<%immediate_sizes%> & (2'b1 << immed_num));
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<%/instructions%>
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default: insn_immed_is_8bit = 1'b0;
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endcase
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endfunction
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