ruby-x/rubyx
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

a spirited effort to make assembly repeatable

Browse Source
This commit is contained in:
Torsten Ruger
2014-06-05 10:46:42 +03:00
parent 41a02a7190
commit e6e969b4e4
5 changed files with 84 additions and 79 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
lib/arm/move_instruction.rb
View File

@@ -23,13 +23,18 @@ module Arm
4
end
def build
def assemble(io)
# don't overwrite instance variables, to make assembly repeatable
rn = @rn
operand = @operand
immediate = @immediate
right = @from
if right.is_a?(Vm::StringConstant)
# do pc relative addressing with the difference to the instuction
# 8 is for the funny pipeline adjustment (ie oc pointing to fetch and not execute)
right = Vm::IntegerConstant.new( right.position - self.position - 8 )
@rn = :pc
rn = :pc
end
if( right.is_a? Fixnum )
right = Vm::IntegerConstant.new( right )
@@ -37,34 +42,30 @@ module Arm
if (right.is_a?(Vm::IntegerConstant))
if (right.integer.fits_u8?)
# no shifting needed
@operand = right.integer
@immediate = 1
operand = right.integer
immediate = 1
elsif (op_with_rot = calculate_u8_with_rr(right))
@operand = op_with_rot
@immediate = 1
operand = op_with_rot
immediate = 1
raise "hmm"
else
raise "cannot fit numeric literal argument in operand #{right.inspect}"
end
elsif (right.is_a?(Symbol) or right.is_a?(Vm::Integer))
@operand = reg_code(right) #integer means the register the integer is in (otherwise constant)
@immediate = 0 # ie not immediate is register
operand = reg_code(right) #integer means the register the integer is in (otherwise constant)
immediate = 0 # ie not immediate is register
else
raise "invalid operand argument #{right.inspect} , #{inspect}"
end
end
def assemble(io)
build
op = shift_handling
instuction_class = 0b00 # OPC_DATA_PROCESSING
val = shift(@operand , 0)
val = shift(operand , 0)
val |= shift(op , 0) # any barral action, is already shifted
val |= shift(reg_code(@to) , 12)
val |= shift(reg_code(@rn) , 12+4)
val |= shift(reg_code(rn) , 12+4)
val |= shift(@attributes[:update_status] , 12+4+4)#20
val |= shift(op_bit_code , 12+4+4 +1)
val |= shift(@immediate , 12+4+4 +1+4)
val |= shift(immediate , 12+4+4 +1+4)
val |= shift(instuction_class , 12+4+4 +1+4+1)
val |= shift(cond_bit_code , 12+4+4 +1+4+1+2)
io.write_uint32 val