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implement offset addressing for load (ie reg+num)

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This commit is contained in:
Torsten Ruger
2014-04-22 12:23:55 +03:00
parent 2784a8da98
commit 5127deeeff
3 changed files with 21 additions and 16 deletions
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21
lib/asm/arm/memory_access_builder.rb
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@ -28,32 +28,25 @@ module Asm
# Build representation for target address
def build_operand(arg)
#str / ldr are _seruous instructions. With BIG possibilities no half are implemented
#str / ldr are _serious instructions. With BIG possibilities not half are implemented
@i = 0
@pre_post_index = 0
@w = 0
@operand = 0
if (arg.is_a?(Asm::RegisterNode))
@rn = reg_ref(arg)
if (false ) #argr.op and argr.right.is_a?(Asm::NumLiteralNode))
# this if was buggy even before
# but as mentioned here we'd have to implement the options
# though a better syntax will have to be found
val = argr.right.value
if (val < 0)
if(arg.offset != 0)
@operand = arg.offset
if (@operand < 0)
@add_offset = 0
val *= -1
#TODO test/check/understand
@operand *= -1
else
@add_offset = 1
end
if (val.abs > 4095)
if (@operand.abs > 4095)
raise Asm::AssemblyError.new('reference offset too large/small (max 4095)', argr.right)
end
@operand = val
else
# raise Asm::AssemblyError.new(Asm::ERRSTR_INVALID_ARG, arg)
end
elsif (arg.is_a?(Asm::LabelRefNode) or arg.is_a?(Asm::NumLiteralNode))
@pre_post_index = 1