mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-11-19 06:17:37 +01:00
84 lines
3.3 KiB
TeX
84 lines
3.3 KiB
TeX
|
\documentclass{article}
|
||
|
|
\usepackage[fancyhdr,pdf]{latex2man}
|
||
|
|
|
||
|
|
\input{common.tex}
|
||
|
|
|
||
|
|
\begin{document}
|
||
|
|
|
||
|
|
\begin{Name}{3}{unw\_reg\_states\_iterate}{David Mosberger-Tang}{Programming Library}{unw\_reg\_states\_iterate}unw\_reg\_states\_iterate -- get register state info on current procedure
|
||
|
|
\end{Name}
|
||
|
|
|
||
|
|
\section{Synopsis}
|
||
|
|
|
||
|
|
\File{\#include $<$libunwind.h$>$}\\
|
||
|
|
|
||
|
|
\Type{int} \Func{unw\_reg\_states\_iterate}(\Type{unw\_cursor\_t~*}\Var{cp}, \Type{unw\_reg\_states\_callback}\Var{cb}, \Type{void~*}\Var{token});\\
|
||
|
|
|
||
|
|
\section{Description}
|
||
|
|
|
||
|
|
The \Func{unw\_reg\_states\_iterate}() routine provides
|
||
|
|
information about the procedure that created the stack frame
|
||
|
|
identified by argument \Var{cp}. The \Var{cb} argument is a pointer
|
||
|
|
to a function of type \Type{unw\_reg\_states\_callback} which is used to
|
||
|
|
return the information. The function \Type{unw\_reg\_states\_callback} has the
|
||
|
|
following definition:
|
||
|
|
|
||
|
|
\Type{int} (~*\Var{unw\_reg\_states\_callback})(\Type{void~*}\Var{token},
|
||
|
|
\Type{void~*}\Var{reg\_states\_data},
|
||
|
|
\Type{size\_t} \Var{reg\_states\_data\_size},
|
||
|
|
\Type{unw\_word\_t} \Var{start\_ip}, \Type{unw\_word\_t} \Var{end\_ip});
|
||
|
|
|
||
|
|
The callback function may be invoked several times for each call of \Func{unw\_reg\_states\_iterate}. Each call is associcated with a instruction address range and a set of instructions on how to update register values when returning from the procedure in that address range. For each invocation, the arguments to the callback function are:
|
||
|
|
\begin{description}
|
||
|
|
\item[\Type{void~*} \Var{token}] The token value passed to \Var{unw\_reg\_states\_callback}. \\
|
||
|
|
\item[\Type{void~*} \Var{reg\_states\_data}] A pointer to data about
|
||
|
|
updating register values. This data, or a copy of it, can be passed
|
||
|
|
to \Var{unw\_apply\_reg\_state}.\\
|
||
|
|
\item[\Type{int} \Var{reg\_states\_data\_size}] The size of the register update data. \\
|
||
|
|
\item[\Type{unw\_word\_t} \Var{start\_ip}] The address of the first
|
||
|
|
instruction of the address range. \\
|
||
|
|
\item[\Type{unw\_word\_t} \Var{end\_ip}] The address of the first
|
||
|
|
instruction \emph{beyond} the end of the address range. \\
|
||
|
|
\end{description}
|
||
|
|
|
||
|
|
\section{Return Value}
|
||
|
|
|
||
|
|
On successful completion, \Func{unw\_reg\_states\_iterate}() returns
|
||
|
|
0. If the callback function returns a nonzero value, that indicates
|
||
|
|
failure and the function returns immediately. Otherwise the negative
|
||
|
|
value of one of the error-codes below is returned.
|
||
|
|
|
||
|
|
\section{Thread and Signal Safety}
|
||
|
|
|
||
|
|
\Func{unw\_reg\_states\_iterate}() is thread-safe. If cursor \Var{cp} is
|
||
|
|
in the local address-space, this routine is also safe to use from a
|
||
|
|
signal handler.
|
||
|
|
|
||
|
|
\section{Errors}
|
||
|
|
|
||
|
|
\begin{Description}
|
||
|
|
\item[\Const{UNW\_EUNSPEC}] An unspecified error occurred.
|
||
|
|
\item[\Const{UNW\_ENOINFO}] \Prog{Libunwind} was unable to locate
|
||
|
|
unwind-info for the procedure.
|
||
|
|
\item[\Const{UNW\_EBADVERSION}] The unwind-info for the procedure has
|
||
|
|
version or format that is not understood by \Prog{libunwind}.
|
||
|
|
\end{Description}
|
||
|
|
In addition, \Func{unw\_reg\_states\_iterate}() may return any error
|
||
|
|
returned by the \Func{access\_mem}() call-back (see
|
||
|
|
\Func{unw\_create\_addr\_space}(3)).
|
||
|
|
|
||
|
|
\section{See Also}
|
||
|
|
|
||
|
|
\SeeAlso{libunwind(3)},
|
||
|
|
\SeeAlso{unw\_apply\_reg\_state(3)}
|
||
|
|
|
||
|
|
\section{Author}
|
||
|
|
|
||
|
|
\noindent
|
||
|
|
David Mosberger-Tang\\
|
||
|
|
Email: \Email{dmosberger@gmail.com}\\
|
||
|
|
WWW: \URL{http://www.nongnu.org/libunwind/}.
|
||
|
|
\LatexManEnd
|
||
|
|
|
||
|
|
\end{document}
|