HP Ski Simulator, IA-64 manual User Registers Pane, Register Window in xski

Ski IA-64 Simulator Reference Manual 1.0L

Figure 3-1. The Register Window in xski

ski shows only a portion of a register set at a time and you use the commands described in Section 5.1, “Register Window Commands” to select which portion of which set to see. The sets are described below in the order they appear in the Reg- ister Window. Their xski realizations are shown as well.

3.2.1The User Registers Pane

The user registers pane (see Figure 3-2) displays the Predicate Registers (prs) in binary, the Application Registers in hexadecimal, and the Branch Registers (b0-b7) and the Instruction Pointer (ip) symbolically if possible, otherwise in hexadecimal. Symbolic displays are limited to sixteen characters; when more than sixteen characters are needed, the first fifteen are displayed and an asterisk (“ *”) is added to indicate that the symbolic display has been abbreviated. The fields of the Current Frame Marker (cfm) register and subfields of the Previous Frame Marker field ( pfm) are displayed in decimal. For bit-encoded registers, some bits are displayed individually using their IA-64 mnemonics. If a bit name is displayed in uppercase, the bit is currently set, and if the name is displayed in lowercase, the bit is currently clear. For example, the psr.be bit is shown as “ BE” in Figure 3-2,indicating that the bit is set. The User Mask bitfield ( psr.um) from the Processor Status Register (psr) is displayed in this pane; the entire psr is shown in the System Registers pane, described in Section 3.2.4, “The System Registers Pane”. Predicate Registers pr16-pr63are displayed in their rotated form, as indicated by the rrbp field of the Current Frame Marker ( cfm) register.

At the middle of the pane, the line starting “ clean” shows, in decimal, the values in the internal registers that control the Register Save Engine (rse). The IA-64 architecture requires that these registers exist but provides no program-visible access to them.

3-2 Screen Presentation Copyright © 2000 Hewlett-Packard Co.