58 lines
1.7 KiB
Ruby
58 lines
1.7 KiB
Ruby
module Asm
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module InstructionTools
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OPCODES = {
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:adc => 0b0101, :add => 0b0100,
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:and => 0b0000, :bic => 0b1110,
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:eor => 0b0001, :orr => 0b1100,
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:rsb => 0b0011, :rsc => 0b0111,
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:sbc => 0b0110, :sub => 0b0010,
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# for these Rn is sbz (should be zero)
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:mov => 0b1101,
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:mvn => 0b1111,
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# for these Rd is sbz and S=1
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:cmn => 0b1011,
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:cmp => 0b1010,
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:teq => 0b1001,
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:tst => 0b1000,
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:b => 0b1010,
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:bl => 0b1011,
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:bx => 0b00010010
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}
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COND_CODES = {
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:al => 0b1110, :eq => 0b0000,
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:ne => 0b0001, :cs => 0b0010,
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:mi => 0b0100, :hi => 0b1000,
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:cc => 0b0011, :pl => 0b0101,
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:ls => 0b1001, :vc => 0b0111,
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:lt => 0b1011, :le => 0b1101,
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:ge => 0b1010, :gt => 0b1100,
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:vs => 0b0110
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}
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OPC_DATA_PROCESSING = 0b00
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OPC_MEMORY_ACCESS = 0b01
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OPC_STACK = 0b10
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def reg_ref(arg)
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if (not arg.is_a?(Asm::Register))
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raise Asm::AssemblyError.new("argument must be a register not #{arg}")
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end
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ref =
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{'r0' => 0, 'r1' => 1, 'r2' => 2, 'r3' => 3, 'r4' => 4, 'r5' => 5,
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'r6' => 6, 'r7' => 7, 'r8' => 8, 'r9' => 9, 'r10' => 10, 'r11' => 11,
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'r12' => 12, 'r13' => 13, 'r14' => 14, 'r15' => 15, 'a1' => 0, 'a2' => 1,
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'a3' => 2, 'a4' => 3, 'v1' => 4, 'v2' => 5, 'v3' => 6, 'v4' => 7, 'v5' => 8,
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'v6' => 9, 'rfp' => 9, 'sl' => 10, 'fp' => 11, 'ip' => 12, 'sp' => 13,
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'lr' => 14, 'pc' => 15}[arg.name.downcase]
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if (not ref)
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raise Asm::AssemblyError.new("unknown register #{arg}")
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end
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ref
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end
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end
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end |