# Add the first 10 numbers, and return the result in the exit code. # # To run: # $ ./subx translate examples/ex3.subx -o examples/ex3 # $ ./subx run examples/ex3 # Expected result: # $ echo $? # 55 == code 0x09000000 # instruction effective address register displacement immediate # . op subop mod rm32 base index scale r32 # . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes Entry: # result: EBX = 0 bb/copy-to-EBX 0/imm32 # counter: ECX = 1 b9/copy-to-ECX 1/imm32 $loop: # if (counter > 10) break 81 7/subop/compare 3/mod/direct 1/rm32/ECX . . . . . 0xa/imm32 # compare ECX 7f/jump-if-greater $exit/disp8 # result += counter 01/add 3/mod/direct 3/rm32/EBX . . . 1/r32/ECX . . # add ECX to EBX # ++counter 41/increment-ECX # loop eb/jump $loop/disp8 $exit: # syscall(exit, EBX) b8/copy-to-EAX 1/imm32/exit cd/syscall 0x80/imm8 == data 0x0a000000 # . . vim:nowrap:textwidth=0