address alignment

[devel]

Hi,

might be a newbie question but how to locate a 6 bytes structure at an odd word address i.e.
address mod 4 equals to 2? An example in C would be very helpful, thnx.

regards,
devel.

[01000101]

I am confused by your question. Do you want to know how to find a 6-byte structure or are you wondering about its location relative to an 'odd' linear address?

[devel]

I am confused by your question. Do you want to know how to find a 6-byte structure or are you wondering about its location relative to an 'odd' linear address?

how to put 6bytes structure at an odd word address.

[cyr1x]

Code: Select all

 memcpy(ptr-(ptr%4), ptr, lenght); 

I think this should work.

[bewing]

Add a 2 byte word to the beginning of the structure, and put it at a normal address -- then pass the pointer to the second entry in the structure.

[os64dev]

how to locate a 6 bytes structure at an odd word address i.e.
address mod 4 equals to 2? An example in C would be very helpful, thnx.

Code: Select all

struct pseudo_ptr {
    unsigned short dummy;
    unsigned short segment:
    unsigned long  address;
};

an example where it is used. struct needs to be packed btw.