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. Here is the pseudo-assembler from the C++ compiler. 4400 C1AC 000114 | EX r0,HOOK..STMT 5870 D0C0 000114 | L r7,record(,r13,192) 5810 D0C8 000114 | L r1,#CEECAACRENT_2(, 5880 35DA 000114 | L r8,=Q(entryPoint)(, 4118 1000 000114 | LA r1,=Q(entryPoint)(r 5810 1000 000114 | L r1,entryPoint(,r1,0 58F0 1008 000114 | L r15,&EPA_&WSA(,r1,8 5800 100C 000114 | L r0,&EPA_&WSA(,r1,12 5000 C1F4 000114 | ST r0,_CEECAA_(,r12,50 4110 D098 000114 | LA r1,#MX_TEMP2(,r13,1 5070 D098 000114 | ST r7,#MX_TEMP2(,r13,1 4400 C1C0 000114 | EX r0,HOOK..CALLBGN 0DEF 000114 | BASR r14,r15 4400 C1C4 000114 | EX r0,HOOK..CALLRET Does anyone know what I should be declaring or doing differently? (If all else fails I will just write a stub in assembler to do this. I know how to L 15 BALR 14,15 in assembler <g>.) Charles ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
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