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0260	3b	;

# Example reading commandline arguments: compute length of first arg. # # To run: # $ ./bootstrap translate init.linux apps/ex8.subx -o apps/ex8 # $ ./bootstrap run apps/ex8 abc de fghi # Expected result: # $ echo $? # 3 # length of 'abc' # # At the start of a SubX program: # argc: *esp # argv[0]: *(esp+4) # argv[1]: *(esp+8) # ... # Locals start from esp-4 downwards. == code # 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: # . prologue 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp # eax = ascii-length(argv[1]) # . . push args ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8) # . . call e8/call ascii-length/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # exit(eax) 89/copy 3/mod/direct 3/rm32/ebx . . . 0/r32/eax . . # copy eax to ebx e8/call syscall_exit/disp32 ascii-length: # s: (addr array byte) -> n/eax # edx = s 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none . 2/r32/edx 4/disp8 . # copy *(esp+4) to edx # var result/eax = 0 b8/copy-to-eax 0/imm32 $ascii-length:loop: # var c/ecx = *s 8a/copy-byte 0/mod/* 2/rm32/edx . . . 1/r32/CL . . # copy byte at *edx to CL # if (c == '\0') break 81 7/subop/compare 3/mod/direct 1/rm32/ecx . . . . . 0/imm32/null # compare ecx 74/jump-if-= $ascii-length:end/disp8 # ++s 42/increment-edx # ++result 40/increment-eax # loop eb/jump $ascii-length:loop/disp8 $ascii-length:end: # return eax c3/return == data # . . vim:nowrap:textwidth=0