SEGLD/SEGWT macro - is type 2, gets no lock.
Calls module IEWSUOVR, entry point IGC037.
GTF data is:
- R15
- No applicable data.
- R0
- Zero entry was from SEGLD. Nonzero entry from SEGWT.
- R1
- Address of the parameter list.
- PLIST
- 12 bytes, format is:
- Bytes
- Contents
- 0-3
- Branch instruction to a SVC 45.
- 4-7
- Address of the referred-to-symbol.
- 8
- "TO" segment number.
- 9-11
- Previous caller or zero.