1 ## print out a (global variable) string to stdout 2 # 3 # To run (from the subx directory): 4 # $ subx translate examples/ex6.subx -o examples/ex6 5 # $ subx run examples/ex6 6 # Hello, world! 7 8 == code 9 # instruction effective address operand displacement immediate 10 # op subop mod rm32 base index scale r32 11 # 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 12 13 # syscall(write, stdout, X, size) 14 # fd = 1 (stdout) 15 bb/copy-to-EBX 1/imm32 16 # initialize X (location to write result to) 17 b9/copy-to-ECX X/imm32 18 # initialize size 19 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 2/r32/EDX Size/disp32 . # copy *size to EDX 20 # syscall 21 b8/copy-to-EAX 4/imm32/write 22 cd/syscall 0x80/imm8 23 24 # syscall(exit, EBX) 25 b8/copy-to-EAX 1/imm32/exit 26 cd/syscall 0x80/imm8 27 28 == data 29 30 Size: # size of string 31 0e 00 00 00 # 14 32 X: # string to print 33 48 65 6c 6c 6f 2c 20 77 6f 72 6c 64 21 0a 00 34 # H e l l o , ␣ w o r l d ! newline null 35 36 # vim:nowrap:textwidth=0