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little more attribute filing

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This commit is contained in:
Torsten Ruger 2014-05-10 16:08:53 +03:00
parent 9e5b60dfab
commit 5b002c0ff6
3 changed files with 6 additions and 9 deletions
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1
lib/arm/compare_instruction.rb
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@ -8,7 +8,6 @@ module Arm
def initialize(attributes)
super(attributes)
@attributes[:condition_code] = :al
@attributes[:opcode] = attributes[:opcode]
@operand = 0
@i = 0
@attributes[:update_status_flag] = 1

1
lib/arm/logic_instruction.rb
View File

@ -10,7 +10,6 @@ module Arm
super(attributes)
@attributes[:update_status_flag] = 0
@attributes[:condition_code] = :al
@attributes[:opcode] = attributes[:opcode]
@operand = 0
@rn = nil

13
lib/arm/memory_instruction.rb
View File

@ -10,14 +10,10 @@ module Arm
super(attributes)
@attributes[:update_status_flag] = 0
@attributes[:condition_code] = :al
@attributes[:opcode] = attributes[:opcode]
@operand = 0
@i = 0 #I flag (third bit)
@pre_post_index = 0 #P flag
@add_offset = 0 #U flag
@byte_access = opcode.to_s[-1] == "b" ? 1 : 0 #B (byte) flag
@w = 0 #W flag
@is_load = opcode.to_s[0] == "l" ? 1 : 0 #L (load) flag
@rn = :r0 # register zero = zero bit pattern
@rd = :r0 # register zero = zero bit pattern
@ -73,21 +69,24 @@ module Arm
def assemble(io)
build
i = 0 #I flag (third bit)
#not sure about these 2 constants. They produce the correct output for str r0 , r1
# but i can't help thinking that that is because they are not used in that instruction and
# so it doesn't matter. Will see
@add_offset = 1
@pre_post_index = 1
w = 0 #W flag
byte_access = opcode.to_s[-1] == "b" ? 1 : 0 #B (byte) flag
instuction_class = 0b01 # OPC_MEMORY_ACCESS
val = @operand.is_a?(Symbol) ? reg_code(@operand) : @operand
val |= (reg_code(@rd) << 12 )
val |= (reg_code(@rn) << 12+4) #16
val |= (@is_load << 12+4 +4)
val |= (@w << 12+4 +4+1)
val |= (@byte_access << 12+4 +4+1+1)
val |= (w << 12+4 +4+1)
val |= (byte_access << 12+4 +4+1+1)
val |= (@add_offset << 12+4 +4+1+1+1)
val |= (@pre_post_index << 12+4 +4+1+1+1+1)#24
val |= (@i << 12+4 +4+1+1+1+1 +1)
val |= (i << 12+4 +4+1+1+1+1 +1)
val |= (instuction_class<<12+4 +4+1+1+1+1 +1+1)
val |= (cond_bit_code << 12+4 +4+1+1+1+1 +1+1+2)
io.write_uint32 val