[Search for users] [Overall Top Noters] [List of all Conferences] [Download this site]

Conference noted::hackers_v1

Title:	-={ H A C K E R S }=-
Notice:	Write locked - see NOTED::HACKERS
Moderator:	DIEHRD::MORRIS

Created:	Thu Feb 20 1986
Last Modified:	Mon Aug 03 1992
Last Successful Update:	Fri Jun 06 1997
Number of topics:	680
Total number of notes:	5456

248.0. ">255 args to CALLS" by VIRTUE::RICO () Wed May 28 1986 17:13

    This isn't a great hack, but I thought it was funny.  The other
    day, I had a program that was bombing on a call to SYS$FAO.  It
    turned out that the stack was getting corrupted, and futher inspection
    showed that there were more than 255 arguments in the CALLS
    instruction, and only the low order byte is used, so the stack
    was getting trashed on the RET from FAO!!
    
    I could've used CALLG, but instead I just saved and restored
    the SP manually!  (Must be other code somewhere that has to do this...)

T.R Title User Personal
Name Date Lines

248.1 PASTIS::MONAHAN Thu May 29 1986 04:03 5

T.R	Title	User	Personal Name	Date	Lines
248.1		PASTIS::MONAHAN		`Thu May 29 1986 04:03`	5
	DEC Standard 032 on page 123 makes it clear that CALLS has only one byte available for the number of arguments. The other 3 in the longword are "used by DIGITAL software"; does anyone know for what? Dave

    	DEC Standard 032 on page 123 makes it clear that CALLS has only
    one byte available for the number of arguments. The other 3 in the
    longword are "used by DIGITAL software"; does anyone know for what?
    
    		Dave