Using virtual in macro

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hellomachine

Joined: 18 May 2023
Posts: 22
Location: I don't even exist

hellomachine 19 May 2023, 20:41

Hello, i tried to create a macro for virtual process but i got illegal instruction error

Code:

macro virtual_define_size \
 [v_label] {
  forward
   virtual #v_label
    #v_label#.size = $ - $$
   end virtual
}

What is the problem?

_________________
JESUS _F_ CHRIST

19 May 2023, 20:41

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20401
Location: In your JS exploiting you and your system

revolution 19 May 2023, 21:21

"virtual #v_label" get joined to a single "virtualv_label". Remove the leading #.

19 May 2023, 21:21

macomics

Joined: 26 Jan 2021
Posts: 1004
Location: Russia

macomics 19 May 2023, 22:28

Code:

macro virtual_define_size [v_label] { forward label v_label#.size at ( $ - v_label ) }

19 May 2023, 22:28

hellomachine

Joined: 18 May 2023
Posts: 22
Location: I don't even exist

hellomachine 20 May 2023, 05:38

revolution wrote:

"virtual #v_label" get joined to a single "virtualv_label". Remove the leading #.

Is this correct (for defining a virtual and using

Code:

db

to define its bytes) ?

Code:

macro v_define \
[virtual_label] {
  forward
   virtual virtual_label#
    #virtual_label#.size = $ - $$
   end virtual
   #virtual_label#.start:
   repeat virtual_label#.size
    load a BYTE from virtual_label#:%-1
    db a
   end repeat }

I got no error from this, but i afraid there might be a hidden problem !

_________________
JESUS _F_ CHRIST

20 May 2023, 05:38

macomics

Joined: 26 Jan 2021
Posts: 1004
Location: Russia

macomics 20 May 2023, 11:16

Code:

macro v_define [virtual_label] { common label virtual_label#.size at ( $ - $$ )
  forward virtual_label#.start: repeat virtual_label#.size
    load a BYTE from virtual_label: ( % - 1 )
    db a
   end repeat }

virtual
a::
db 256 dup $
end virtual
v_define a

Code:

~ $ fasm -m 1024 test.asm
flat assembler  version 1.73.30  (1024 kilobytes memory)
1 passes, 0 bytes.

0 bytes - because $ - $$ = 0
It is necessary to calculate the size inside the virtual block, then the value will be correct (256)

Code:

macro v_define [virtual_label] { common local a
  forward virtual_label#.start: repeat virtual_label#.size
    load a BYTE from virtual_label: ( % - 1 )
    db a
   end repeat }

virtual
a::
db 256 dup $
label a.size at ( $ - $$ )
end virtual
v_define a

Code:

~ $ fasm -m 1024 test.asm
flat assembler  version 1.73.30  (1024 kilobytes memory)
1 passes, 256 bytes.

Code:

~ $ hexdump -C ./test.bin
00000000  00 01 02 03 04 05 06 07  08 09 0a 0b 0c 0d 0e 0f  |................|
00000010  10 11 12 13 14 15 16 17  18 19 1a 1b 1c 1d 1e 1f  |................|
00000020  20 21 22 23 24 25 26 27  28 29 2a 2b 2c 2d 2e 2f  | !"#$%&'()*+,-./|
00000030  30 31 32 33 34 35 36 37  38 39 3a 3b 3c 3d 3e 3f  |0123456789:;<=>?|
00000040  40 41 42 43 44 45 46 47  48 49 4a 4b 4c 4d 4e 4f  |@ABCDEFGHIJKLMNO|
00000050  50 51 52 53 54 55 56 57  58 59 5a 5b 5c 5d 5e 5f  |PQRSTUVWXYZ[\]^_|
00000060  60 61 62 63 64 65 66 67  68 69 6a 6b 6c 6d 6e 6f  |`abcdefghijklmno|
00000070  70 71 72 73 74 75 76 77  78 79 7a 7b 7c 7d 7e 7f  |pqrstuvwxyz{|}~.|
00000080  80 81 82 83 84 85 86 87  88 89 8a 8b 8c 8d 8e 8f  |................|
00000090  90 91 92 93 94 95 96 97  98 99 9a 9b 9c 9d 9e 9f  |................|
000000a0  a0 a1 a2 a3 a4 a5 a6 a7  a8 a9 aa ab ac ad ae af  |................|
000000b0  b0 b1 b2 b3 b4 b5 b6 b7  b8 b9 ba bb bc bd be bf  |................|
000000c0  c0 c1 c2 c3 c4 c5 c6 c7  c8 c9 ca cb cc cd ce cf  |................|
000000d0  d0 d1 d2 d3 d4 d5 d6 d7  d8 d9 da db dc dd de df  |................|
000000e0  e0 e1 e2 e3 e4 e5 e6 e7  e8 e9 ea eb ec ed ee ef  |................|
000000f0  f0 f1 f2 f3 f4 f5 f6 f7  f8 f9 fa fb fc fd fe ff  |................|
00000100

20 May 2023, 11:16

hellomachine

Joined: 18 May 2023
Posts: 22
Location: I don't even exist

hellomachine 20 May 2023, 17:55

macomics wrote:

Code:

macro v_define [virtual_label] { common label virtual_label#.size at ( $ - $$ )
  forward virtual_label#.start: repeat virtual_label#.size
    load a BYTE from virtual_label: ( % - 1 )
    db a
   end repeat }

virtual
a::
db 256 dup $
end virtual
v_define a

Code:

~ $ fasm -m 1024 test.asm
flat assembler  version 1.73.30  (1024 kilobytes memory)
1 passes, 0 bytes.

0 bytes - because $ - $$ = 0
It is necessary to calculate the size inside the virtual block, then the value will be correct (256)

Code:

macro v_define [virtual_label] { common local a
  forward virtual_label#.start: repeat virtual_label#.size
    load a BYTE from virtual_label: ( % - 1 )
    db a
   end repeat }

virtual
a::
db 256 dup $
label a.size at ( $ - $$ )
end virtual
v_define a

Code:

~ $ fasm -m 1024 test.asm
flat assembler  version 1.73.30  (1024 kilobytes memory)
1 passes, 256 bytes.

Code:

~ $ hexdump -C ./test.bin
00000000  00 01 02 03 04 05 06 07  08 09 0a 0b 0c 0d 0e 0f  |................|
00000010  10 11 12 13 14 15 16 17  18 19 1a 1b 1c 1d 1e 1f  |................|
00000020  20 21 22 23 24 25 26 27  28 29 2a 2b 2c 2d 2e 2f  | !"#$%&'()*+,-./|
00000030  30 31 32 33 34 35 36 37  38 39 3a 3b 3c 3d 3e 3f  |0123456789:;<=>?|
00000040  40 41 42 43 44 45 46 47  48 49 4a 4b 4c 4d 4e 4f  |@ABCDEFGHIJKLMNO|
00000050  50 51 52 53 54 55 56 57  58 59 5a 5b 5c 5d 5e 5f  |PQRSTUVWXYZ[\]^_|
00000060  60 61 62 63 64 65 66 67  68 69 6a 6b 6c 6d 6e 6f  |`abcdefghijklmno|
00000070  70 71 72 73 74 75 76 77  78 79 7a 7b 7c 7d 7e 7f  |pqrstuvwxyz{|}~.|
00000080  80 81 82 83 84 85 86 87  88 89 8a 8b 8c 8d 8e 8f  |................|
00000090  90 91 92 93 94 95 96 97  98 99 9a 9b 9c 9d 9e 9f  |................|
000000a0  a0 a1 a2 a3 a4 a5 a6 a7  a8 a9 aa ab ac ad ae af  |................|
000000b0  b0 b1 b2 b3 b4 b5 b6 b7  b8 b9 ba bb bc bd be bf  |................|
000000c0  c0 c1 c2 c3 c4 c5 c6 c7  c8 c9 ca cb cc cd ce cf  |................|
000000d0  d0 d1 d2 d3 d4 d5 d6 d7  d8 d9 da db dc dd de df  |................|
000000e0  e0 e1 e2 e3 e4 e5 e6 e7  e8 e9 ea eb ec ed ee ef  |................|
000000f0  f0 f1 f2 f3 f4 f5 f6 f7  f8 f9 fa fb fc fd fe ff  |................|
00000100

Hello, thanks for your codes, but your second v_define is equal to mine. Right ? Or I missed something ? I also, calculated the virtual's size in virtual ... end virtual ...

_________________
JESUS _F_ CHRIST

20 May 2023, 17:55

macomics

Joined: 26 Jan 2021
Posts: 1004
Location: Russia

macomics 20 May 2023, 18:16

Here are the comments for the second code

Code:

macro v_define [virtual_label] ; Declaring the v_define macro
{
  common ; The following lines will be executed once per macro call
    local a ; Declare the local name [b]a[/b] in the macro in order to use it as a variable and not overwrite the value of the global variable [b]a[/b]
  forward ; The following lines will be executed for each macro argument (*)
    virtual_label#.start: ; Declaring the block start label (*)
      repeat virtual_label#.size ; Byte-by-byte block copy cycle (*)
        load a BYTE from virtual_label: ( % - 1 ) ; Reading the next byte (*)
        db a ; Copying the value of the next byte (*)
   end repeat ; End of cycle (*)
}

virtual ; Declaring data in the virtual block
a:: ; Data access label from the virtual block
; <- $$
db 256 dup $ ; 256 arbitrary bytes
; <- $
label a.size at ( $ - $$ ) ; Calculating the length of data in the virtual block
end virtual ; End of virtual
; * In this example, the macro lines will be repeated once
v_define a ; Calling a macro with the [b]a[/b] parameter

Code:

macro v_define [virtual_label] ; Declaring the v_define macro
{
  common ; The following lines will be executed once per macro call
    local a ; Declare the local name [b]a[/b] in the macro in order to use it as a variable and not overwrite the value of the global variable [b]a[/b]
  forward ; The following lines will be executed for each macro argument (*)
    virtual_label#.start: ; Declaring the block start label (*)
      repeat virtual_label#.size ; Byte-by-byte block copy cycle (*)
        load a BYTE from virtual_label: ( % - 1 ) ; Reading the next byte (*)
        db a ; Copying the value of the next byte (*)
   end repeat ; End of cycle (*)
}

virtual ; Declaring data in the virtual block
a:: ; Data access label from the virtual block
; <- $$
db 128 dup $ ; 128 arbitrary bytes
; <- $
label a.size at ( $ - $$ ) ; Calculating the length of data in the virtual block
end virtual ; End of virtual
virtual ; Declaring data in the virtual block
b:: ; Data access label from the virtual block
; <- $$
db 128 dup $ ; 128 arbitrary bytes
; <- $
label b.size at ( $ - $$ ) ; Calculating the length of data in the virtual block
end virtual ; End of virtual
; * In this example, the macro lines will be repeated twice
v_define a, b ; Calling a macro with the [b]a[/b] and [b]b[/b] parameters

Code:

~ $ fasm -m 1024 test1.asm
flat assembler  version 1.73.30  (1024 kilobytes memory)
1 passes, 256 bytes.
~ $ hexdump -C ./test1.bin
00000000  00 01 02 03 04 05 06 07  08 09 0a 0b 0c 0d 0e 0f  |................|
00000010  10 11 12 13 14 15 16 17  18 19 1a 1b 1c 1d 1e 1f  |................|
00000020  20 21 22 23 24 25 26 27  28 29 2a 2b 2c 2d 2e 2f  | !"#$%&'()*+,-./|
00000030  30 31 32 33 34 35 36 37  38 39 3a 3b 3c 3d 3e 3f  |0123456789:;<=>?|
00000040  40 41 42 43 44 45 46 47  48 49 4a 4b 4c 4d 4e 4f  |@ABCDEFGHIJKLMNO|
00000050  50 51 52 53 54 55 56 57  58 59 5a 5b 5c 5d 5e 5f  |PQRSTUVWXYZ[\]^_|
00000060  60 61 62 63 64 65 66 67  68 69 6a 6b 6c 6d 6e 6f  |`abcdefghijklmno|
00000070  70 71 72 73 74 75 76 77  78 79 7a 7b 7c 7d 7e 7f  |pqrstuvwxyz{|}~.|
00000080  80 81 82 83 84 85 86 87  88 89 8a 8b 8c 8d 8e 8f  |................|
00000090  90 91 92 93 94 95 96 97  98 99 9a 9b 9c 9d 9e 9f  |................|
000000a0  a0 a1 a2 a3 a4 a5 a6 a7  a8 a9 aa ab ac ad ae af  |................|
000000b0  b0 b1 b2 b3 b4 b5 b6 b7  b8 b9 ba bb bc bd be bf  |................|
000000c0  c0 c1 c2 c3 c4 c5 c6 c7  c8 c9 ca cb cc cd ce cf  |................|
000000d0  d0 d1 d2 d3 d4 d5 d6 d7  d8 d9 da db dc dd de df  |................|
000000e0  e0 e1 e2 e3 e4 e5 e6 e7  e8 e9 ea eb ec ed ee ef  |................|
000000f0  f0 f1 f2 f3 f4 f5 f6 f7  f8 f9 fa fb fc fd fe ff  |................|
00000100
~ $ fasm -m 1024 test2.asm
flat assembler  version 1.73.30  (1024 kilobytes memory)
1 passes, 256 bytes.
~ $ hexdump -C ./test2.bin
00000000  00 01 02 03 04 05 06 07  08 09 0a 0b 0c 0d 0e 0f  |................|
00000010  10 11 12 13 14 15 16 17  18 19 1a 1b 1c 1d 1e 1f  |................|
00000020  20 21 22 23 24 25 26 27  28 29 2a 2b 2c 2d 2e 2f  | !"#$%&'()*+,-./|
00000030  30 31 32 33 34 35 36 37  38 39 3a 3b 3c 3d 3e 3f  |0123456789:;<=>?|
00000040  40 41 42 43 44 45 46 47  48 49 4a 4b 4c 4d 4e 4f  |@ABCDEFGHIJKLMNO|
00000050  50 51 52 53 54 55 56 57  58 59 5a 5b 5c 5d 5e 5f  |PQRSTUVWXYZ[\]^_|
00000060  60 61 62 63 64 65 66 67  68 69 6a 6b 6c 6d 6e 6f  |`abcdefghijklmno|
00000070  70 71 72 73 74 75 76 77  78 79 7a 7b 7c 7d 7e 7f  |pqrstuvwxyz{|}~.|
00000080  00 01 02 03 04 05 06 07  08 09 0a 0b 0c 0d 0e 0f  |................|
00000090  10 11 12 13 14 15 16 17  18 19 1a 1b 1c 1d 1e 1f  |................|
000000a0  20 21 22 23 24 25 26 27  28 29 2a 2b 2c 2d 2e 2f  | !"#$%&'()*+,-./|
000000b0  30 31 32 33 34 35 36 37  38 39 3a 3b 3c 3d 3e 3f  |0123456789:;<=>?|
000000c0  40 41 42 43 44 45 46 47  48 49 4a 4b 4c 4d 4e 4f  |@ABCDEFGHIJKLMNO|
000000d0  50 51 52 53 54 55 56 57  58 59 5a 5b 5c 5d 5e 5f  |PQRSTUVWXYZ[\]^_|
000000e0  60 61 62 63 64 65 66 67  68 69 6a 6b 6c 6d 6e 6f  |`abcdefghijklmno|
000000f0  70 71 72 73 74 75 76 77  78 79 7a 7b 7c 7d 7e 7f  |pqrstuvwxyz{|}~.|
00000100

20 May 2023, 18:16

hellomachine

Joined: 18 May 2023
Posts: 22
Location: I don't even exist

hellomachine 20 May 2023, 19:27

macomics wrote:

Here are the comments for the second code

Code:

macro v_define [virtual_label] ; Declaring the v_define macro
{
  common ; The following lines will be executed once per macro call
    local a ; Declare the local name [b]a[/b] in the macro in order to use it as a variable and not overwrite the value of the global variable [b]a[/b]
  forward ; The following lines will be executed for each macro argument (*)
    virtual_label#.start: ; Declaring the block start label (*)
      repeat virtual_label#.size ; Byte-by-byte block copy cycle (*)
        load a BYTE from virtual_label: ( % - 1 ) ; Reading the next byte (*)
        db a ; Copying the value of the next byte (*)
   end repeat ; End of cycle (*)
}

virtual ; Declaring data in the virtual block
a:: ; Data access label from the virtual block
; <- $$
db 256 dup $ ; 256 arbitrary bytes
; <- $
label a.size at ( $ - $$ ) ; Calculating the length of data in the virtual block
end virtual ; End of virtual
; * In this example, the macro lines will be repeated once
v_define a ; Calling a macro with the [b]a[/b] parameter

Code:

macro v_define [virtual_label] ; Declaring the v_define macro
{
  common ; The following lines will be executed once per macro call
    local a ; Declare the local name [b]a[/b] in the macro in order to use it as a variable and not overwrite the value of the global variable [b]a[/b]
  forward ; The following lines will be executed for each macro argument (*)
    virtual_label#.start: ; Declaring the block start label (*)
      repeat virtual_label#.size ; Byte-by-byte block copy cycle (*)
        load a BYTE from virtual_label: ( % - 1 ) ; Reading the next byte (*)
        db a ; Copying the value of the next byte (*)
   end repeat ; End of cycle (*)
}

virtual ; Declaring data in the virtual block
a:: ; Data access label from the virtual block
; <- $$
db 128 dup $ ; 128 arbitrary bytes
; <- $
label a.size at ( $ - $$ ) ; Calculating the length of data in the virtual block
end virtual ; End of virtual
virtual ; Declaring data in the virtual block
b:: ; Data access label from the virtual block
; <- $$
db 128 dup $ ; 128 arbitrary bytes
; <- $
label b.size at ( $ - $$ ) ; Calculating the length of data in the virtual block
end virtual ; End of virtual
; * In this example, the macro lines will be repeated twice
v_define a, b ; Calling a macro with the [b]a[/b] and [b]b[/b] parameters

Code:

~ $ fasm -m 1024 test1.asm
flat assembler  version 1.73.30  (1024 kilobytes memory)
1 passes, 256 bytes.
~ $ hexdump -C ./test1.bin
00000000  00 01 02 03 04 05 06 07  08 09 0a 0b 0c 0d 0e 0f  |................|
00000010  10 11 12 13 14 15 16 17  18 19 1a 1b 1c 1d 1e 1f  |................|
00000020  20 21 22 23 24 25 26 27  28 29 2a 2b 2c 2d 2e 2f  | !"#$%&'()*+,-./|
00000030  30 31 32 33 34 35 36 37  38 39 3a 3b 3c 3d 3e 3f  |0123456789:;<=>?|
00000040  40 41 42 43 44 45 46 47  48 49 4a 4b 4c 4d 4e 4f  |@ABCDEFGHIJKLMNO|
00000050  50 51 52 53 54 55 56 57  58 59 5a 5b 5c 5d 5e 5f  |PQRSTUVWXYZ[\]^_|
00000060  60 61 62 63 64 65 66 67  68 69 6a 6b 6c 6d 6e 6f  |`abcdefghijklmno|
00000070  70 71 72 73 74 75 76 77  78 79 7a 7b 7c 7d 7e 7f  |pqrstuvwxyz{|}~.|
00000080  80 81 82 83 84 85 86 87  88 89 8a 8b 8c 8d 8e 8f  |................|
00000090  90 91 92 93 94 95 96 97  98 99 9a 9b 9c 9d 9e 9f  |................|
000000a0  a0 a1 a2 a3 a4 a5 a6 a7  a8 a9 aa ab ac ad ae af  |................|
000000b0  b0 b1 b2 b3 b4 b5 b6 b7  b8 b9 ba bb bc bd be bf  |................|
000000c0  c0 c1 c2 c3 c4 c5 c6 c7  c8 c9 ca cb cc cd ce cf  |................|
000000d0  d0 d1 d2 d3 d4 d5 d6 d7  d8 d9 da db dc dd de df  |................|
000000e0  e0 e1 e2 e3 e4 e5 e6 e7  e8 e9 ea eb ec ed ee ef  |................|
000000f0  f0 f1 f2 f3 f4 f5 f6 f7  f8 f9 fa fb fc fd fe ff  |................|
00000100
~ $ fasm -m 1024 test2.asm
flat assembler  version 1.73.30  (1024 kilobytes memory)
1 passes, 256 bytes.
~ $ hexdump -C ./test2.bin
00000000  00 01 02 03 04 05 06 07  08 09 0a 0b 0c 0d 0e 0f  |................|
00000010  10 11 12 13 14 15 16 17  18 19 1a 1b 1c 1d 1e 1f  |................|
00000020  20 21 22 23 24 25 26 27  28 29 2a 2b 2c 2d 2e 2f  | !"#$%&'()*+,-./|
00000030  30 31 32 33 34 35 36 37  38 39 3a 3b 3c 3d 3e 3f  |0123456789:;<=>?|
00000040  40 41 42 43 44 45 46 47  48 49 4a 4b 4c 4d 4e 4f  |@ABCDEFGHIJKLMNO|
00000050  50 51 52 53 54 55 56 57  58 59 5a 5b 5c 5d 5e 5f  |PQRSTUVWXYZ[\]^_|
00000060  60 61 62 63 64 65 66 67  68 69 6a 6b 6c 6d 6e 6f  |`abcdefghijklmno|
00000070  70 71 72 73 74 75 76 77  78 79 7a 7b 7c 7d 7e 7f  |pqrstuvwxyz{|}~.|
00000080  00 01 02 03 04 05 06 07  08 09 0a 0b 0c 0d 0e 0f  |................|
00000090  10 11 12 13 14 15 16 17  18 19 1a 1b 1c 1d 1e 1f  |................|
000000a0  20 21 22 23 24 25 26 27  28 29 2a 2b 2c 2d 2e 2f  | !"#$%&'()*+,-./|
000000b0  30 31 32 33 34 35 36 37  38 39 3a 3b 3c 3d 3e 3f  |0123456789:;<=>?|
000000c0  40 41 42 43 44 45 46 47  48 49 4a 4b 4c 4d 4e 4f  |@ABCDEFGHIJKLMNO|
000000d0  50 51 52 53 54 55 56 57  58 59 5a 5b 5c 5d 5e 5f  |PQRSTUVWXYZ[\]^_|
000000e0  60 61 62 63 64 65 66 67  68 69 6a 6b 6c 6d 6e 6f  |`abcdefghijklmno|
000000f0  70 71 72 73 74 75 76 77  78 79 7a 7b 7c 7d 7e 7f  |pqrstuvwxyz{|}~.|
00000100

Thank you, a useful example.

_________________
JESUS _F_ CHRIST

20 May 2023, 19:27

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