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79 lines
2.4 KiB
TeX
79 lines
2.4 KiB
TeX
\documentclass{article}
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\usepackage[fancyhdr,pdf]{latex2man}
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\input{common.tex}
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\begin{document}
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\begin{Name}{3}{unw\_get\_reg}{David Mosberger-Tang}{Programming Library}{unw\_get\_reg}unw\_get\_reg -- get register contents
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\end{Name}
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\section{Synopsis}
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\File{\#include $<$libunwind.h$>$}\\
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\Type{int} \Func{unw\_get\_reg}(\Type{unw\_cursor\_t~*}\Var{cp}, \Type{unw\_regnum\_t} \Var{reg}, \Type{unw\_word\_t~*}\Var{valp});\\
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\section{Description}
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The \Func{unw\_get\_reg}() routine reads the value of register
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\Var{reg} in the stack frame identified by cursor \Var{cp} and stores
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the value in the word pointed to by \Var{valp}.
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The register numbering is target-dependent and described in separate
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manual pages (e.g., libunwind-ia64(3) for the IA-64 target).
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Furthermore, the exact set of accessible registers may depend on the
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type of frame that \Var{cp} is referring to. For ordinary stack
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frames, it is normally possible to access only the preserved
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(``callee-saved'') registers and frame-related registers (such as the
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stack-pointer). However, for signal frames (see
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\Func{unw\_is\_signal\_frame}(3)), it is usually possible to access
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all registers.
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Note that \Func{unw\_get\_reg}() can only read the contents of
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registers whose values fit in a single word. See
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\Func{unw\_get\_fpreg}(3) for a way to read registers which do not fit
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this constraint.
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\section{Return Value}
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On successful completion, \Func{unw\_get\_reg}() returns 0.
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Otherwise the negative value of one of the error-codes below is
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returned.
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\section{Thread and Signal Safety}
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\Func{unw\_get\_reg}() is thread-safe as well as safe to use
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from a signal handler.
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\section{Errors}
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\begin{Description}
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\item[\Const{UNW\_EUNSPEC}] An unspecified error occurred.
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\item[\Const{UNW\_EBADREG}] An attempt was made to read a register
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that is either invalid or not accessible in the current frame.
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\end{Description}
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In addition, \Func{unw\_get\_reg}() may return any error returned by
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the \Func{access\_mem}(), \Func{access\_reg}(), and
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\Func{access\_fpreg}() call-backs (see
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\Func{unw\_create\_addr\_space}(3)).
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\section{See Also}
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\SeeAlso{libunwind(3)},
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\SeeAlso{libunwind-ia64(3)},
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\SeeAlso{unw\_get\_fpreg(3)},
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\SeeAlso{unw\_is\_signal\_frame(3)},
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\SeeAlso{unw\_set\_reg(3)}
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\section{Author}
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\noindent
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David Mosberger-Tang\\
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Hewlett-Packard Labs\\
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Palo-Alto, CA 94304\\
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Email: \Email{davidm@hpl.hp.com}\\
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WWW: \URL{http://www.hpl.hp.com/research/linux/libunwind/}.
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\LatexManEnd
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\end{document}
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