NonStop S-Series Server Description Manual (G06.27+)

TNS Execution Modes
HP NonStop S-Series Server Description Manual—520331-004
6-43
Actions of the PCAL Instruction
Figure 6-24. Sequence of Events Performed by a PCAL Instruction
L Register
ENV Register
P Register
Preceding
Stack
Marker
Caller's
Local
Data
Top of Stack
Three-word stack marker
saving caller's environment
L Register
7150
PCAL Instruction Format
0010111
PEP Number (PN)
P Register
S Register
6
PEP
C [PN]
C [PEP]
ENV Register
Caller's L Register
(Last stack marker)
Caller's ENV Register
Caller's P Register
(Next instruction)
7
S Register
Caller
RP
Code Segment Data Segment
Prior
1
2
3
4
5
6
P
ENV
L
PCAL PN
Called
Procedure
VST289.vsd