There's a TSO/E vector table that has the address of the REXX routines.
// get the address of the TSO/e vector table
CVT * cvt = *(( CVT ** ) CVTPTR);
TSVT * tsvt = cvt->cvttvt;
// IKJTSVT.H - TSO/E Vector Table mapping
//
// Contains addresses of branch entered routines and control blocks.
//
??=ifdef __COMPILER_VER__
??=pragma filetag("IBM-1047")
??=endif
#ifndef TSVT_H
#define TSVT_H
#ifdef __cplusplus
extern "C" {
#endif
#pragma pack(1)
#ifdef __cplusplus
extern "OS_UPSTACK" {
#else
#pragma linkage(tsvt_rexxfunc_t,OS_UPSTACK)
#endif
typedef int tsvt_rexxfunc_t( char *, ... );
#ifdef __cplusplus
}
#endif
#ifdef __cplusplus
extern "OS_UPSTACK" {
#else
#pragma linkage(tsvt_irxterm_t,OS_UPSTACK)
#endif
typedef int tsvt_irxterm_t();
#ifdef __cplusplus
}
#endif
typedef struct tsvt TSVT;
struct tsvt {
char tsvttsvt[4]; // acronym in EBCDIC 'TSVT'
char tsvtlev; // TSVT version
char tsvtflg1; // flag indicators
char tsvtrsv1[2]; // reserved
void * tsvtnct; // address of the most current notice
void * tsvtvacc; // address of the CLIST variable access routine
void * tsvtasf; // address of the authorized service
void * tsvtltbl; // address of logon address table
void * tsvtfla1; // address of logon initialization
void * tsvtctio; // address of CLIST I/O LAR
void * tsvtctab; // address of load module containing
void * tsvtt440; // address of CLIST variable access
void * tsvtt441; // address of general variable access
void * tsvtputl; // address of PUTLINE routine
void * tsvtptgt; // address of PUTGET routine
void * tsvtgetl; // address of GETLINE routine
void * tsvtstck; // address of STACK routine
void * tsvttsl; // address of TMP LAR
void * tsvtscan; // address of scan routine
void * tsvtpars; // address of parse routine
void * tsvtef02; // address of message writer routine
void * tsvttpvt; // address of TPVT
void * tsvtrcvy; // address of recovery routine ikjcmdrc
void * tsvttran; // IKJTRANS
char tsvtbcmt[8]; // member token for broadcast notice XCF group
void * tsvtcaf; // clist attention facility addr rel 3
struct {
char tsvtlver; //- VERSIONLEVEL
char tsvtlrel[2]; //- RELEASE NUMBER
char tsvtlmod; //- MODIFICATION LEVEL
} tsvttsol;
void *tsvtctdb; // ADDRESS OF DOUBLE BYTE CHAR ROUTINE
void *tsvtrif; // BROADCAST DATA SET INTERFACE
void *tsvtraf; // LOGON RACF SUPPORT ROUTINE ADDRESS
void *tsvtrtrp; // TSO ROUTER ADDRESS
void *tsvttbls; // ADDRESS OF TABLE LOOK UP SERVICE
void *tsvtadtb; // ADDRESS OF ALTLIB
void *tsvttblr; // ADDRESS OF TABLE LOOKUP SERVICE RTN
tsvt_rexxfunc_t *irxestk1; // Address of IRXESTK1
tsvt_rexxfunc_t *irxtvars; // Address of IRXTVARS
tsvt_rexxfunc_t *irxinit; // Address of IRXINIT
tsvt_rexxfunc_t *irxiolar; // Address of IRXIOLAR
tsvt_rexxfunc_t *irxsto00; // Address of IRXSTO00
void * ikjct44x; // Address of IKJCT44X
void * ikjefts2; // Address of IKJEFTS2
tsvt_rexxfunc_t *irxexec; // Address of IRXEXEC
tsvt_rexxfunc_t *irxinout; // Address of IRXINOUT
tsvt_rexxfunc_t *irxload; // Address of IRXLOAD
tsvt_irxterm_t *irxterm;
tsvt_rexxfunc_t *irxsubcm; // Address of IRXSUBCM
tsvt_rexxfunc_t *irxmsgid; // Address of IRXMSGID
tsvt_rexxfunc_t *irxexcom; // Address of IRXEXCOM
tsvt_rexxfunc_t *irxterma; // Address of IRXTERMA
void * tsvtetvp; // Address of Exit & Vector Table
void * tsvttsfi; // Address of IKJEFTSI
void * tsvttsft; // Address of IKJEFTST
int tsvtpcn1; // PC number for IKJPCENV
void * tsvtsnta; // System copy of the SNTAB
void * tsvtsvta; // System copy of the SVTAB
int tsvtsyml; // Length of system SNTAB and SVTAB
int tsvtxcfu; // Lock for parmlib updating
void * tsvtmstr; // Address of Master ASCB
int tsvtbecb; // ECB for IKJBCMSG
void * tsvtappc; // Addr of APPC callable service table
void * tsvturps; // Address of IKJURPS module
int tsvtpcn2; // PC number for IKJCMDPC
void * tsvtmsr0; // Address of IKJMSR0 module
void * tsvtmdt_; // Address of module table
int tsvtsecb; // ECB for broadcast switches
void * tsvtswas; // Address of ASCB for address space
void * tsvtswwa; // Address of switch processing work area
void * tsvtswcb; // Address of switch control block
int _filler1[7]; // Reserved
double tsvtend; // ASSURE TSVT ENDS ON DOUBLE WORD
};
// Values for field "tsvtend" */
#define TSVERETR 1 // RETURN VARIABLE VALUE
#define TSVEUPDT 2 // UPDATE VARIABLE
#define TSVELOC 3 // LOCATE / LOCATE NEXT
#define TSVERSVD 4 // RESERVED
#define TSVNOIMP 18 // NO IMPLICIT @ZA87430
#define TSVROK 0 // EVERY THING OK
#define TSVRNORS 4 // VARIABLE RETURNED SHOULDN'T
#define TSVREVAL 8 // VARIABLE RETURNED REQUIRES
#define TSVRLAB 12 // VARIABLE RETURNED IS A
#define TSVRNAUP 16 // SYSTEM VARIABLE - CAN'T BE
#define TSVRNOM 20 // FOR LOCATE - NO VARIABLE
#define TSVRPROC 24 // VARIABLE RETURNED IS A PROCEDURE
#define TSVRSVD2 30 // RESERVED @E21D2G9
#define TSVRGETF 32 // GETMAIN/FREEMAIN FAILURE
#define TSVRNSIZ 36 // SYMBOL NAME TOO LARGE
#define TSVRENV 40 // INCORRECT ENVIRONMENT
#define TSVRPARM 44 // INVALID ENTRY CODE
#define TSVRDUP 48 // DUPLICATE SYMBOL FOUND
#define TSVRUNDF 52 // UNDEFINED VARIABLE
#define TSVRGLER 56 // TOO MANY GLOBAL VARIABLES
#define TSVRUNDG 60 // UNDEFINED GLOBAL VARIABLE
#define TSVRINVR 64 // VARIABLE NOT VALID AS A CALL BY
#define TSVRUNDR 68 // UNDEFINED CALL BY REFERENCE VARIABLE
#define TSVIREXX 80 // VARIABLE NAME IS NOT VALID FOR REXX
#define TSVREXXE 81 // AN UNEXPECTED RETURN CODE WAS
#define TSVTNCTU 0x80 // Instorage copy of system notices
#define TSVTNETL 0x40 // None of the TSO/E Exits
#define TSVTUPDP 0x20 // IKJBCMSG posted for parmlib update
#define TSVTSWCH 0x10 // IKJBCMSG posted to switch the
#pragma pack(reset)
#ifdef __cplusplus
}
#endif
On Thu, Nov 16, 2023 at 10:55 AM Charles Mills <[email protected]> wrote:
> > There isn’t an R0 issue. IRXINIT(‘FINDENVB’) will fetch the environment
> block.
>
> IIRC I needed the entry R0 to get the address of IRXINIT so I could call
> it.
>
> Charles
>
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