this retrofits the eval and dis modules to use a bigint for the opcode during the decode phase, supporting pcodes of arbitrary length and (potentially) variable-length opcodes.
once a particular encoding is identified through the decode tree, we convert the bigint to a fixed-width bitvector. this is then passed through to the rest of the evaluation / analysis.
this can be tested with the following ASL file:
__instruction test1
__encoding test
__instruction_set TEST
__opcode 'xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxx xxxx'
__guard TRUE
__decode
__execute
boolean something;
bits(64) left = Zeros();
bits(64) right = Zeros();
if (left == right) then
something = TRUE;
else
something = FALSE;
__decode TEST
case (0 +: 4) of
when (_) => __encoding test
run:
dune exec asli -- --no-aarch64 prelude.asl mra_tools/arch/regs.asl mra_tools/types.asl mra_tools/arch//arch.asl tests/test.asl
this 40-bit opcode will now decode successfully: :sem TEST 0xffffeeeeff.
this retrofits the eval and dis modules to use a bigint for the opcode during the decode phase, supporting pcodes of arbitrary length and (potentially) variable-length opcodes.
once a particular encoding is identified through the decode tree, we convert the bigint to a fixed-width bitvector. this is then passed through to the rest of the evaluation / analysis.
this can be tested with the following ASL file:
run:
this 40-bit opcode will now decode successfully:
:sem TEST 0xffffeeeeff.