mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-11-16 05:08:12 +01:00
74 lines
2.3 KiB
TeX
74 lines
2.3 KiB
TeX
\documentclass{article}
|
|
\usepackage[fancyhdr,pdf]{latex2man}
|
|
|
|
\input{common.tex}
|
|
|
|
\begin{document}
|
|
|
|
\begin{Name}{3}{unw\_resume}{David Mosberger-Tang}{Programming Library}{unw\_resume}
|
|
|
|
unw\_resume -- resume execution in a particular stack frame
|
|
\end{Name}
|
|
|
|
\section{Synopsis}
|
|
|
|
\File{\#include $<$libunwind.h$>$}\\
|
|
|
|
\Type{int} \Func{unw\_resume}(\Type{unw\_cursor\_t~*}\Var{cursor});\\
|
|
|
|
\section{Description}
|
|
|
|
The \Func{unw\_resume}() routine resumes execution at the stack frame
|
|
identified by \Var{cursor}. Normally, this is accomplished by
|
|
restoring the ``preserved'' (callee-saved) machine state. However, if
|
|
execution in any of the stack frames younger (more deeply nested) than
|
|
the one identified by \Var{cursor} was interrupted by a signal, then
|
|
\Func{unw\_resume}() will restore the entire machine state, including
|
|
the ``preserved'' and ``scratch'' (caller-saved) registers, as well as
|
|
the signal mask.
|
|
|
|
Most platforms reserve some registers to pass arguments to exception
|
|
handlers (e.g., IA-64 uses \texttt{r15}-\texttt{r18} for this
|
|
purpose). These registers are normally treated like ``scratch''
|
|
registers. However, if \Prog{libunwind} is used to define an
|
|
exception argument register, e.g., by calling \Func{unw\_set\_reg}(),
|
|
then \Func{unw\_resume}() will always install the new value as the
|
|
contents of that register. In other words, the exception handling
|
|
arguments are installed even in cases where normally only the
|
|
``preserved'' registers are restored.
|
|
|
|
\section{Return Value}
|
|
|
|
For local unwinding, \Func{unw\_resume}() does not return on success.
|
|
For remote unwinding, it returns 0 on success. On failure, the
|
|
negative value of one of the errors below is returned.
|
|
|
|
\section{Errors}
|
|
|
|
\begin{Description}
|
|
\item[\Const{UNW\_EUNSPEC}] An unspecified error occurred.
|
|
\item[\Const{UNW\_EBADREG}] A register needed by \Func{unw\_resume}() wasn't
|
|
accessible.
|
|
\item[\Const{UNW\_EINVALIDIP}] The instruction pointer identified by
|
|
\Var{cursor} is not valid.
|
|
\item[\Const{UNW\_BADFRAME}] The stack frame identified by
|
|
\Var{cursor} is not valid.
|
|
\end{Description}
|
|
|
|
\section{See Also}
|
|
|
|
\SeeAlso{libunwind(3)},
|
|
\SeeAlso{unw\_set\_reg(3)},
|
|
sigprocmask(2)
|
|
|
|
\section{Author}
|
|
|
|
\noindent
|
|
David Mosberger-Tang\\
|
|
Hewlett-Packard Labs\\
|
|
Palo-Alto, CA 94304\\
|
|
Email: \Email{davidm@hpl.hp.com}\\
|
|
WWW: \URL{http://www.hpl.hp.com/research/linux/libunwind/}.
|
|
\LatexManEnd
|
|
|
|
\end{document}
|