dbx strcpy arguments

Thanks for the answer. As for the values accuracy I also noticed that. In my case first parameter equal to 0x4c0a2f3. I always thought that user data addresses always should be mapped in high region of the virtual memory. Do you know is it correct ? or why the first parameter has such strange value?

Thanks.

gshcherb@gmailcom at 2007-7-7 2:48:43 >

When no debug info is available for a function, dbx displays contents of out or in registers as function parameters (assuming that you're on sparc). Sparc provides six registers for parameters passing: o0-o5 (o6 and o7 are reserved by the ABI) -- this is why you see six parameters in strcpy() call.

Of course, not all of them are used by the function, but as to leaf functions that get their parameters through 'in' registers rather than 'out', dbx does its best to detect such a function and present correct registers as this function parameters.

In case of strcpy(), it is a leaf function in Solaris 10 and not a leaf function in, for example, Solaris 8's libc.so. So in the first case dbx will display 'out' registers as strcpy() parameters and in the second case, it will display 'in' registers (assuming function prologue, a 'save' instruction, has been executed and new reg window is allocated; before that, it will display out regs).

MaximKartashev at 2007-7-7 2:48:43 >