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fix the load memory instruction

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This commit is contained in:
Torsten Ruger 2014-06-01 22:06:59 +03:00
parent 31a55b07ac
commit 83d4ce55ca
2 changed files with 24 additions and 18 deletions
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40
lib/arm/memory_instruction.rb
View File

@ -31,15 +31,17 @@ module Arm
@rn = arg
if @right
@operand = @right
if (@operand < 0)
@add_offset = 0
#TODO test/check/understand
@operand *= -1
else
@add_offset = 1
end
if (@operand.abs > 4095)
raise "reference offset too large/small (max 4095) #{arg} #{inspect}"
unless( @operand.is_a? Symbol)
if (@operand < 0)
@add_offset = 0
#TODO test/check/understand
@operand *= -1
else
@add_offset = 1
end
if (@operand.abs > 4095)
raise "reference offset too large/small (max 4095) #{arg} #{inspect}"
end
end
end
elsif (arg.is_a?(Vm::StringConstant) ) #use pc relative
@ -62,8 +64,6 @@ module Arm
def assemble(io)
build
puts inspect
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
@ -71,21 +71,27 @@ module Arm
# TODO to be continued
@add_offset = 0 if @attributes[:add_offset]
@pre_post_index = 1
@pre_post_index = 0 if @attributes[:flaggie]
w = 0 #W flag
byte_access = opcode.to_s[-1] == "b" ? 1 : 0 #B (byte) flag
instuction_class = 0b01 # OPC_MEMORY_ACCESS
val = @operand
val = reg_code(@operand) if @operand.is_a?(Symbol)
if @operand.is_a?(Symbol)
val = reg_code(@operand)
@pre_post_index = 0
i = 1 # not quite sure about this, but it gives the output of as. read read read.
else
i = 0 #I flag (third bit)
val = @operand
end
val = shift(val , 0 ) # for the test
@pre_post_index = 0 if @attributes[:flaggie]
val |= shift(reg_code(@result) , 12 )
val |= shift(reg_code(@rn) , 12+4) #16
val |= shift(@is_load , 12+4 +4)
val |= shift(w , 12+4 +4+1)
val |= shift(byte_access , 12+4 +4+1+1)
val |= shift(@add_offset , 12+4 +4+1+1+1)
val |= shift(@pre_post_index , 12+4 +4+1+1+1+1)#24
val |= shift(i , 12+4 +4+1+1+1+1 +1)
val |= shift(@add_offset , 12+4 +4+1+1+1)
val |= shift(@pre_post_index, 12+4 +4+1+1+1+1)#24
val |= shift(i , 12+4 +4+1+1+1+1 +1)
val |= shift(instuction_class,12+4 +4+1+1+1+1 +1+1)
val |= shift(cond_bit_code , 12+4 +4+1+1+1+1 +1+1+2)
io.write_uint32 val

2
lib/core/kernel.rb
View File

@ -88,7 +88,7 @@ module Core
# make char out of digit (by using ascii encoding) 48 == "0"
b = utoa_function.body.scope binding
b.remainder = remainder + 48
b.strb( remainder, right: str_addr )
b.strb( remainder, str_addr )
b.sub( str_addr, str_addr , 1 )
b.cmp( number , 0 )
b.callne( utoa_function )