Totalview® Reference Guide : PART III Platforms and Operating Systems : Chapter 11 Architectures : Intel IA-64 : Previous Function State Register Fields (PFS)
Previous Function State Register Fields (PFS)
The Previous Function State register (PFS) contains multiple fields: Previous Frame Marker (pfm), Previous Epilog Count (pec), and Previous Privilege Level (ppl). These values are copied automatically on a call from the CFM register, Epilog Count Register (EC), and PSR.cpl (Current Privilege Level in the Processor Status Register) to accelerate procedure calling.
Value
Bit Setting
Meaning
37:0
pfm
previous frame marker
57:52
pec
previous epilog count
63:62
ppl
previous privilege level