OVLYBRCH macro - is type 2, gets no lock.
Calls module IEWSUOVR, entry point IGC045.
GTF data is:
- R15
- Address of the entry-table entry that caused the SVC to be issued.
- R0 and R1
- No applicable data.
- PLIST
- 12 bytes long; format is:
- Bytes
- Contents
- 0-3
- Branch instruction to SVC 45.
- 4-7
- Address of the referred-to symbol.
- 8
- "To" segment number.
- 9-11
- Previous caller or zero.