Finding XPLINK information in a Language Environment dump

Table 1 describes the specific XPLINK information in sections of the Language Environment dump.

Table 1. Contents of XPLINK information in a Language Environment dump
Section Number and Heading	Contents
[1] Traceback	When an XPLINK-compiled routine calls a NOXPLINK-compiled routine, a glue routine gets control to convert the linkage conventions of the XPLINK caller to those of the NOXPLINK callee. In the sample dump, this routine is CEEVRONU and it appears between `main()` and tran1() and again between `tran2()` and `tran3()`. When a NOXPLINK-compiled routine calls an XPLINK-compiled routine, a glue routine gets control to convert the linkage conventions of the NOXPLINK caller to those of the XPLINK callee. In the sample dump, this routine is CEEVROND and it appears between EDCZHINV and `main()` and again between `tran1()` and `tran2()`.
[2] Parameters, Registers, and Variables for Active Routines	In this section, each DSA is identified as one of the following: UPSTACK DSA The DSA format is that for a NOXPLINK-compiled program that uses an upward growing stack. DOWNSTACK DSA The DSA format is that for ax XPLINK-compiled program that uses an downward growing stack. TRANSITION DSA The DSA format is that of its callee. A transition DSA can occur between an UPSTACK DSA and a DOWNSTACK DSA where it represents a transition from one linkage convention to another. A transition DSA can also occur between two DOWNSTACK DSAs where it represents a transition from one stack segment to another (a stack overflow).
[3] Control Blocks for Active Routines	In this section, DSAs are formatted. Those previously identified as UPSTACK DSAs will have one format and those identified as DOWNSTACK DSAs will have a different format. Those identified as TRANSITION DSAs will have two parts; the first will be either the downstack or upstack format, the second is unique to transition DSAs and contains information about the transition. It is important to understand that the registers saved in an upstack DSA are those saved by a routine that the DSA-owning routine called. Typically register 15 is the entry point of the routine that was called, and register 14 is the return address into the DSA-owning routine. In contrast, the registers saved in an downstack DSA are those saved by the DSA-owning routine on entry. Register 7 is the return address back to the caller of the DSA-owning routine. Register 6 may be the entry point of the DSA-owning routine. (This is not true when the Branch Relative and Save instruction is used to implement the call.)