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killasmurf86



Joined: 29 Sep 2010
Posts: 36
killasmurf86
Is it somehow possible to
Code:
push macro_name macro_parameter    


I want to know if it's possible for macro to "return" value, that will be pushed?
Post 31 Oct 2010, 16:10
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baldr



Joined: 19 Mar 2008
Posts: 1651
baldr
killasmurf86,

Macro is a macro, it has nothing to do with instructions (it's assembler stage's work). Could you show an example of what you're trying to achieve?
Post 31 Oct 2010, 16:19
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killasmurf86



Joined: 29 Sep 2010
Posts: 36
killasmurf86
I need analogue to http://fxr.watson.org/fxr/source/sys/ioccom.h?v=FREEBSD8
So later I can use puch _IOW(g,n,t) for example

Currently I work around this by inserting push in one of macros.... this works quite well, but code doesn't look so readable

here's part of code, that reads vol from /dev/mixer on FreeBSD

Code:
SIZEOF_INT                     = 4 ; for 64bit arch should be 8

IOCPARM_SHIFT                           = 13
IOCPARM_MASK                            = (1 shl IOCPARM_SHIFT) - 1
macro IOCPARM_LEN x              { (x shr 16) and IOCPARM_MASK }
macro IOCBASECMD x                 { x and not (IOCPARM_MASK shl 16) }
macro IOCGROUP x               { (x shr 8) and 0xFF }
IOC_VOID                            = 0x20000000
IOC_OUT                                 = 0x40000000
IOC_IN                                  = 0x80000000
IOC_INOUT                       = IOC_OUT or IOC_IN
IOC_DIRMASK                      = IOC_VOID or IOC_OUT or IOC_IN
macro _IOC inout, group, num, len   { push inout or ((len and IOCPARM_MASK) shl 16) or (group shl 8) or num }
macro _IO g, n                            { _IOC IOC_VOID, g, n, 0 }
macro _IOWINT g, n              { _IOC IOC_VOID, g, n, SIZEOF_INT }
macro _IOR g, n, t             { _IOC IOC_OUT, g, n, t } ; t must be sizeof
macro _IOW g, n, t                    { _IOC IOC_IN, g, n, t }  ; t must be sizeof
macro _IORW g, n, t                   { _IOC IOC_INOUT, g, n, t }       ; t must be sizeof

macro MIXER_READ dev              { _IOR 'M', dev, SIZEOF_INT } 
macro MIXER_WRITE dev             { _IOW 'M', dev, SIZEOF_INT } 

...
    push    vol
    MIXER_READ SOUND_MIXER_VOLUME
    push    eax
    push    eax
    mov          eax,SYS_IOCTL
    int        0x80
    lea         esp,[esp+4*4]
    jc         error
    mov        eax,[vol]
    

SOUND_MIXER_VOLUME is constant (also calculated in source)
Post 31 Oct 2010, 18:17
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baldr



Joined: 19 Mar 2008
Posts: 1651
baldr
killasmurf86,

You're taking wrong measures against inexistent problems. That .H file doesn't define (almost) anything besides constants.
Post 31 Oct 2010, 18:55
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killasmurf86



Joined: 29 Sep 2010
Posts: 36
killasmurf86
I now....
But it's the way how it defines constants
Post 31 Oct 2010, 20:12
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