== 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 # print 'n' in hex in 'width' bytes in lower-endian order, with a space after every byte emit-hex: # out: (addr buffered-file), n: int, width: int # . prologue 55/push-ebp 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp # . save registers 50/push-eax 51/push-ecx 52/push-edx 53/push-ebx 57/push-edi # edi = out 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 7/r32/edi 8/disp8 . # copy *(ebp+8) to edi # ebx = n 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 3/r32/ebx 0xc/disp8 . # copy *(ebp+12) to ebx # edx = width 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 2/r32/edx 0x10/disp8 . # copy *(ebp+16) to edx # var curr/ecx: int = 0 31/xor 3/mod/direct 1/rm32/ecx . . . 1/r32/ecx . . # clear ecx $emit-hex:loop: # if (curr >= width) break 39/compare 3/mod/direct 1/rm32/ecx . . . 2/r32/edx . . # compare ecx with edx 7d/jump-if->= $emit-hex:end/disp8 # write-byte-hex-buffered(out, ebx) # only BL used # . . push args 53/push-ebx 57/push-edi # . . call e8/call write-byte-hex-buffered/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp # write-byte-buffered(out, ' ') # . . push args 68/push 0x20/imm32/space 57/push-edi # . . call e8/call write-byte-buffered/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp # ebx = ebx >> 8 c1/shift 5/subop/logic-right 3/mod/direct 3/rm32/ebx . . . . . 8/imm8 # shift ebx right by 8 bits, while padding zeroes $emit-hex:continue: # ++curr 41/increment-ecx eb/jump $emit-hex:loop/disp8 $emit-hex:end: # . restore registers 5f/pop-to-edi 5b/pop-to-ebx 5a/pop-to-edx 59/pop-to-ecx 58/pop-to-eax # . epilogue 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp 5d/pop-to-ebp c3/return test-emit-hex-single-byte: # setup # . clear-stream(_test-output-stream) # . . push args 68/push _test-output-stream/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # . clear-stream($_test-output-buffered-file->buffer) # . . push args 68/push $_test-output-buffered-file->buffer/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # emit-hex(_test-output-buffered-file, 0xab, 1) # . . push args 68/push 1/imm32 68/push 0xab/imm32 68/push _test-output-buffered-file/imm32 # . . call e8/call emit-hex/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp # flush(_test-output-buffered-file) # . . push args 68/push _test-output-buffered-file/imm32 # . . call e8/call flush/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # check-ints-equal(*_test-output-stream->data, 'ab ', msg) # . . push args 68/push "F - test-emit-hex-single-byte"/imm32 68/push 0x206261/imm32 # . . push *_test-output-stream->data b8/copy-to-eax _test-output-stream/imm32 ff 6/subop/push 1/mod/*+disp8 0/rm32/eax . . . . 0xc/disp8 . # push *(eax+12) # . . call e8/call check-ints-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp # . end c3/return test-emit-hex-multiple-byte: # setup # . clear-stream(_test-output-stream) # . . push args 68/push _test-output-stream/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # . clear-stream($_test-output-buffered-file->buffer) # . . push args 68/push $_test-output-buffered-file->buffer/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # emit-hex(_test-output-buffered-file, 0x1234, 2) # . . push args 68/push 2/imm32 68/push 0x1234/imm32 68/push _test-output-buffered-file/imm32 # . . call e8/call emit-hex/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp # flush(_test-output-buffered-file) # . . push args 68/push _test-output-buffered-file/imm32 # . . call e8/call flush/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # check-stream-equal(_test-output-stream, "34 12 ", msg) # . . push args 68/push "F - test-emit-hex-multiple-byte/1"/imm32 68/push "34 12 "/imm32 68/push _test-output-stream/imm32 # . . call e8/call check-stream-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp # . end c3/return test-emit-hex-zero-pad: # setup # . clear-stream(_test-output-stream) # . . push args 68/push _test-output-stream/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # . clear-stream($_test-output-buffered-file->buffer) # . . push args 68/push $_test-output-buffered-file->buffer/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # emit-hex(_test-output-buffered-file, 0xab, 2) # . . push args 68/push 2/imm32 68/push 0xab/imm32 68/push _test-output-buffered-file/imm32 # . . call e8/call emit-hex/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp # flush(_test-output-buffered-file) # . . push args 68/push _test-output-buffered-file/imm32 # . . call e8/call flush/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # check(_test-output-stream->data == 'ab 00 ') # . . push args 68/push "F - test-emit-hex-zero-pad/1"/imm32 68/push "ab 00 "/imm32 68/push _test-output-stream/imm32 # . . call e8/call check-stream-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp # . end c3/return test-emit-hex-negative: # setup # . clear-stream(_test-output-stream) # . . push args 68/push _test-output-stream/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # . clear-stream($_test-output-buffered-file->buffer) # . . push args 68/push $_test-output-buffered-file->buffer/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # emit-hex(_test-output-buffered-file, -1, 2) # . . push args 68/push 2/imm32 68/push -1/imm32 68/push _test-output-buffered-file/imm32 # . . call e8/call emit-hex/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp # flush(_test-output-buffered-file) # . . push args 68/push _test-output-buffered-file/imm32 # . . call e8/call flush/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # check-stream-equal(_test-output-stream == "ff ff ") # . . push args 68/push "F - test-emit-hex-negative/1"/imm32 68/push "ff ff "/imm32 68/push _test-output-stream/imm32 # . . call e8/call check-stream-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp # . end c3/return # . . vim:nowrap:textwidth=0