David, thanks, will try again tomorrow. Does it perhaps want to factor differently? Perhaps something more like
(*extern "OS" entryPoint)(const char *); or something? Otherwise aren't you saying that the pointer itself is extern? Don't let me confuse the issue -- it is not CSRSI that I am calling. Header for CSRSI is in SYS1.SAMPLIB somewhere but is printed in the callable services manual. They have something they call csrsi_byaddr that looks exactly like what I am trying to accomplish but it is bracketed with #ifndef __cplusplus which is what leads me to think that perhaps this linkage is not supported for C++. No, have not taken the XPLINK leap. One of these days. Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of David Crayford Sent: Monday, July 16, 2012 7:17 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: How call from C++ thru function pointer to assembler? extern "OS" (*entryPoint)(const char *) is the correct declaration for C++. I have called OS linkage functions from the CVT in C++ without problems. Where is the header file for CSRSI? Are you XPLINK? On 17/07/2012 10:10 AM, Charles Mills wrote: > Another way of saying what I am trying to do is what you do if you are > calling from C++ any MVS callable service or something like that using > the pointer somewhere off of the CVT. > > Looking at the header file for CSRSI it looks like perhaps you can't > do it from C++. > > Charles > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] > On Behalf Of Charles Mills > Sent: Monday, July 16, 2012 5:14 PM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: How call from C++ thru function pointer to assembler? > > Does anyone know the answer to this? > > I have an assembler function whose address I know at run-time in C++. > I define and store it like this > > void __cdecl (*entryPoint)(const char *); entryPoint = (void (__cdecl > *)(const char *))(myVoidStar); printf("entryPoint is %p\n", > entryPoint); > > Printf prints the correct address (DFFD058, FWIW) so I am good so far. > > I then call it with > (entryPoint)(record); > > and I end up S0C6ing out in the weeds at 27F5023B. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
