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