81 lines
2.3 KiB
Ruby
81 lines
2.3 KiB
Ruby
module Asm
|
|
|
|
module InstructionTools
|
|
OPCODES = {
|
|
:adc => 0b0101, :add => 0b0100,
|
|
:and => 0b0000, :bic => 0b1110,
|
|
:eor => 0b0001, :orr => 0b1100,
|
|
:rsb => 0b0011, :rsc => 0b0111,
|
|
:sbc => 0b0110, :sub => 0b0010,
|
|
|
|
# for these Rn is sbz (should be zero)
|
|
:mov => 0b1101,
|
|
:mvn => 0b1111,
|
|
# for these Rd is sbz and S=1
|
|
:cmn => 0b1011,
|
|
:cmp => 0b1010,
|
|
:teq => 0b1001,
|
|
:tst => 0b1000,
|
|
|
|
:b => 0b1010,
|
|
:bl => 0b1011,
|
|
:bx => 0b00010010
|
|
}
|
|
COND_CODES = {
|
|
:al => 0b1110, :eq => 0b0000,
|
|
:ne => 0b0001, :cs => 0b0010,
|
|
:mi => 0b0100, :hi => 0b1000,
|
|
:cc => 0b0011, :pl => 0b0101,
|
|
:ls => 0b1001, :vc => 0b0111,
|
|
:lt => 0b1011, :le => 0b1101,
|
|
:ge => 0b1010, :gt => 0b1100,
|
|
:vs => 0b0110
|
|
}
|
|
OPC_DATA_PROCESSING = 0b00
|
|
OPC_MEMORY_ACCESS = 0b01
|
|
OPC_STACK = 0b10
|
|
|
|
def reg_ref(arg)
|
|
if (not arg.is_a?(Asm::Register))
|
|
raise Asm::AssemblyError.new("argument must be a register not #{arg}")
|
|
end
|
|
|
|
ref =
|
|
{'r0' => 0, 'r1' => 1, 'r2' => 2, 'r3' => 3, 'r4' => 4, 'r5' => 5,
|
|
'r6' => 6, 'r7' => 7, 'r8' => 8, 'r9' => 9, 'r10' => 10, 'r11' => 11,
|
|
'r12' => 12, 'r13' => 13, 'r14' => 14, 'r15' => 15, 'a1' => 0, 'a2' => 1,
|
|
'a3' => 2, 'a4' => 3, 'v1' => 4, 'v2' => 5, 'v3' => 6, 'v4' => 7, 'v5' => 8,
|
|
'v6' => 9, 'rfp' => 9, 'sl' => 10, 'fp' => 11, 'ip' => 12, 'sp' => 13,
|
|
'lr' => 14, 'pc' => 15}[arg.name.downcase]
|
|
|
|
if (not ref)
|
|
raise Asm::AssemblyError.new("unknown register #{arg}")
|
|
end
|
|
|
|
ref
|
|
end
|
|
end
|
|
|
|
def calculate_u8_with_rr(arg)
|
|
parts = arg.value.to_s(2).rjust(32,'0').scan(/^(0*)(.+?)0*$/).flatten
|
|
pre_zeros = parts[0].length
|
|
imm_len = parts[1].length
|
|
if ((pre_zeros+imm_len) % 2 == 1)
|
|
u8_imm = (parts[1]+'0').to_i(2)
|
|
imm_len += 1
|
|
else
|
|
u8_imm = parts[1].to_i(2)
|
|
end
|
|
if (u8_imm.fits_u8?)
|
|
# can do!
|
|
rot_imm = (pre_zeros+imm_len) / 2
|
|
if (rot_imm > 15)
|
|
return nil
|
|
end
|
|
return u8_imm | (rot_imm << 8)
|
|
else
|
|
return nil
|
|
end
|
|
end
|
|
|
|
end |