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author | hp.com!davidm <hp.com!davidm> | 2005-05-17 13:24:49 +0000 |
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committer | hp.com!davidm <hp.com!davidm> | 2005-05-17 13:24:49 +0000 |
commit | 0cae8247a870cfb8c370046640923423f4a62ea1 (patch) | |
tree | d7a347a9744328a8a3fe6024da7f1cedfded271a /doc | |
parent | a6ba57d5566681e68c0f9b6628be829f5a3dade1 (diff) | |
download | libunwind-0cae8247a870cfb8c370046640923423f4a62ea1.tar.gz |
Clarify that UNW_IA64_PR works like the "move predicates" instruction, i.e.,
it acesses the physical (unrotated) contents of p16-p63.
(Logical change 1.292)
Diffstat (limited to 'doc')
-rw-r--r-- | doc/libunwind-ia64.tex | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/doc/libunwind-ia64.tex b/doc/libunwind-ia64.tex index b3dd45d4..1275709a 100644 --- a/doc/libunwind-ia64.tex +++ b/doc/libunwind-ia64.tex @@ -145,8 +145,11 @@ The following normal register name macros are available: \Const{UNW\_IA64\_BR}\texttt{+6} should be used. \item[\Const{UNW\_IA64\_PR}:] Contains the set of predicate registers. This 64-bit wide register contains registers \texttt{p0} through - \texttt{p63} in the ``broad-side'' format (i.e., \texttt{p0} - corresponds to bit 0, \texttt{p1} to bit 1, and so on). + \texttt{p63} in the ``broad-side'' format. Just like with the + ``move predicates'' instruction, the registers are mapped as if + \texttt{CFM.rrb.pr} were set to 0. Thus, in general the value of + predicate register \texttt{p}$N$ with $N$>=16 can be found + in bit \texttt{16 + (($N$-16)+CFM.rrb.pr) \% 48}. \item[\Const{UNW\_IA64\_CFM}:] Contains the current-frame-mask register. \end{Description} |