387 lines
18 KiB
Plaintext
387 lines
18 KiB
Plaintext
# Print the (hex) textual representation of numbers.
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== 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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# convert the lowest nibble of eax to ascii and return it in the lowest byte of eax
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to-hex-char: # in/eax : int -> out/eax : int
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# no error checking; accepts argument in eax
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# if (eax <= 9) return eax + '0'
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3d/compare-eax-with 0x9/imm32/9
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7f/jump-if-greater $to-hex-char:else/disp8
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05/add-to-eax 0x30/imm32/0
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c3/return
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$to-hex-char:else:
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# otherwise return eax + 'a' - 10
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05/add-to-eax 0x57/imm32/a-10
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c3/return
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append-byte-hex: # f : (addr stream byte), n : 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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# AL = convert upper nibble to hex
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0xc/disp8 . # copy *(ebp+12) to eax
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c1/shift 5/subop/logic-right 3/mod/direct 0/rm32/eax . . . . . 4/imm8 # shift eax right by 4 bits, while padding zeroes
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25/and-eax 0xf/imm32
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# . AL = to-hex-char(AL)
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e8/call to-hex-char/disp32
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# append-byte(f, AL)
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# . . push args
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50/push-eax
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
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# . . call
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e8/call append-byte/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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# AL = convert lower nibble to hex
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0xc/disp8 . # copy *(ebp+12) to eax
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25/and-eax 0xf/imm32
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# . AL = to-hex-char(AL)
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e8/call to-hex-char/disp32
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# append-byte(f, AL)
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# . . push args
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50/push-eax
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
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# . . call
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e8/call append-byte/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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$append-byte-hex:end:
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# . restore registers
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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-append-byte-hex:
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# - check that append-byte-hex adds the hex textual representation
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# setup
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# . clear-stream(_test-stream)
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# . . push args
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68/push _test-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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# append-byte-hex(_test-stream, 0xa) # exercises digit, non-digit as well as leading zero
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# . . push args
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68/push 0xa/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call append-byte-hex/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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# check-stream-equal(_test-stream, "0a", msg)
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# . . push args
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68/push "F - test-append-byte-hex"/imm32
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68/push "0a"/imm32
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68/push _test-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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# print the hex representation for the lowest byte of a number
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print-byte-buffered: # f : (addr buffered-file), n : 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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# AL = convert upper nibble to hex
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0xc/disp8 . # copy *(ebp+12) to eax
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c1/shift 5/subop/logic-right 3/mod/direct 0/rm32/eax . . . . . 4/imm8 # shift eax right by 4 bits, while padding zeroes
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25/and-eax 0xf/imm32
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# . AL = to-hex-char(AL)
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e8/call to-hex-char/disp32
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# write-byte-buffered(f, AL)
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# . . push args
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50/push-eax
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
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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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# AL = convert lower nibble to hex
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0xc/disp8 . # copy *(ebp+12) to eax
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25/and-eax 0xf/imm32
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# . AL = to-hex-char(AL)
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e8/call to-hex-char/disp32
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# write-byte-buffered(f, AL)
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# . . push args
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50/push-eax
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
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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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$print-byte-buffered:end:
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# . restore registers
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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-print-byte-buffered:
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# - check that print-byte-buffered prints the hex textual representation
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# setup
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# . clear-stream(_test-stream)
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# . . push args
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68/push _test-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-buffered-file->buffer)
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# . . push args
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68/push $_test-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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# print-byte-buffered(_test-buffered-file, 0xa) # exercises digit, non-digit as well as leading zero
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# . . push args
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68/push 0xa/imm32
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68/push _test-buffered-file/imm32
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# . . call
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e8/call print-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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# flush(_test-buffered-file)
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# . . push args
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68/push _test-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-stream, "0a", msg)
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# . . push args
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68/push "F - test-print-byte-buffered"/imm32
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68/push "0a"/imm32
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68/push _test-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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print-int32: # f : (addr stream byte), n : int
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# pseudocode:
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# write(f, "0x")
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# ecx = 28
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# while true
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# if (ecx < 0) break
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# eax = n >> ecx
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# eax = eax & 0xf
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# append-byte(f, AL)
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# ecx -= 4
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#
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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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# ecx = 28
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b9/copy-to-ecx 0x1c/imm32
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$print-int32:print-hex-prefix:
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# write(f, "0x")
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# . . push args
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68/push "0x"/imm32
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
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# . . call
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e8/call write/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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$print-int32:loop:
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# if (ecx < 0) break
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81 7/subop/compare 3/mod/direct 1/rm32/ecx . . . . . 0/imm32 # compare ecx
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7c/jump-if-lesser $print-int32:end/disp8
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# eax = n >> ecx
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0xc/disp8 . # copy *(ebp+12) to eax
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d3/>>ecx 5/subop/pad-zeroes 3/mod/direct 0/rm32/eax . . . . . . # shift eax right by ecx bits, padding zeroes
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# eax = to-hex-char(AL)
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25/and-eax 0xf/imm32
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e8/call to-hex-char/disp32
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# append-byte(f, AL)
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# . . push args
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50/push-eax
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
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# . . call
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e8/call append-byte/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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# ecx -= 4
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81 5/subop/subtract 3/mod/direct 1/rm32/ecx . . . . . 4/imm32 # subtract from ecx
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eb/jump $print-int32:loop/disp8
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$print-int32:end:
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# . restore registers
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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-print-int32:
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# - check that print-int32 prints the hex textual representation
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# setup
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# . clear-stream(_test-stream)
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# . . push args
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68/push _test-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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# print-int32(_test-stream, 0x8899aa)
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# . . push args
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68/push 0x8899aa/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call print-int32/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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# check-stream-equal(_test-stream, "0x008899aa", msg)
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# . . push args
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68/push "F - test-print-int32"/imm32
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68/push "0x008899aa"/imm32
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68/push _test-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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print-int32-buffered: # f : (addr buffered-file), n : int
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# pseudocode:
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# write-buffered(f, "0x")
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# ecx = 28
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# while true
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# if (ecx < 0) break
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# eax = n >> ecx
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# eax = eax & 0xf
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# write-byte-buffered(f, AL)
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# ecx -= 4
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#
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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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# ecx = 28
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b9/copy-to-ecx 0x1c/imm32
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$print-int32-buffered:print-hex-prefix:
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# write-buffered(f, "0x")
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# . . push args
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68/push "0x"/imm32
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
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# . . call
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e8/call write-buffered/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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$print-int32-buffered:loop:
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# if (ecx < 0) break
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81 7/subop/compare 3/mod/direct 1/rm32/ecx . . . . . 0/imm32 # compare ecx
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7c/jump-if-lesser $print-int32-buffered:end/disp8
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# eax = n >> ecx
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0xc/disp8 . # copy *(ebp+12) to eax
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d3/>>ecx 5/subop/pad-zeroes 3/mod/direct 0/rm32/eax . . . . . . # shift eax right by ecx bits, padding zeroes
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# eax = to-hex-char(AL)
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25/and-eax 0xf/imm32
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e8/call to-hex-char/disp32
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# write-byte-buffered(f, AL)
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# . . push args
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50/push-eax
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
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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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# ecx -= 4
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81 5/subop/subtract 3/mod/direct 1/rm32/ecx . . . . . 4/imm32 # subtract from ecx
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eb/jump $print-int32-buffered:loop/disp8
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$print-int32-buffered:end:
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# . restore registers
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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-print-int32-buffered:
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# - check that print-int32-buffered prints the hex textual representation
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# setup
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# . clear-stream(_test-stream)
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# . . push args
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68/push _test-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-buffered-file->buffer)
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# . . push args
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68/push $_test-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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# print-int32-buffered(_test-buffered-file, 0x8899aa)
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# . . push args
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68/push 0x8899aa/imm32
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68/push _test-buffered-file/imm32
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# . . call
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e8/call print-int32-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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# flush(_test-buffered-file)
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# . . push args
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68/push _test-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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#? # dump line {{{
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#? # . write-stream(2/stderr, line)
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#? # . . push args
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#? 68/push _test-stream/imm32
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#? 68/push 2/imm32/stderr
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#? # . . call
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#? e8/call write-stream/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(2/stderr, "$\n")
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#? # . . push args
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#? 68/push "$\n"/imm32
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#? 68/push 2/imm32/stderr
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#? # . . call
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#? e8/call write/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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#? # }}}
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# check-stream-equal(_test-stream, "0x008899aa", msg)
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# . . push args
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68/push "F - test-print-int32-buffered"/imm32
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68/push "0x008899aa"/imm32
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68/push _test-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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