mirror of
https://github.com/intel/linux-sgx
synced 2026-06-08 14:49:32 +00:00
Li, Xun
c505e6129a
Added support for Reproducible Enclave Build using Docker file. Added support for Intel AVX-512 instructions and Intel SHA Extensions New Instructions (SHA-NI) in trusted libraries. Support both EPID and ECDSA based quote for quoting related interfaces in sgx_uae_service library. Updated key exchange library to support both EPID and ECDSA based remote attestation. Support new interface to check platform information blob from remote attestation response message. Fixed bugs. Signed-off-by: Li, Xun <xun.li@intel.com>
88 lines
3.2 KiB
TeX
88 lines
3.2 KiB
TeX
\documentclass{article}
|
|
\usepackage[fancyhdr,pdf]{latex2man}
|
|
|
|
\input{common.tex}
|
|
|
|
\begin{document}
|
|
|
|
\begin{Name}{3}{libunwind-setjmp}{David Mosberger-Tang}{Programming Library}{libunwind-based non-local gotos}libunwind-setjmp -- libunwind-based non-local gotos
|
|
\end{Name}
|
|
|
|
\section{Synopsis}
|
|
|
|
\File{\#include $<$setjmp.h$>$}\\
|
|
|
|
\noindent
|
|
\Type{int} \Func{setjmp}(\Type{jmp\_buf}~\Var{env});\\
|
|
\Type{void} \Func{longjmp}(\Type{jmp\_buf}~\Var{env}, \Type{int}~\Var{val});\\
|
|
\Type{int} \Func{\_setjmp}(\Type{jmp\_buf}~\Var{env});\\
|
|
\Type{void} \Func{\_longjmp}(\Type{jmp\_buf}~\Var{env}, \Type{int}~\Var{val});\\
|
|
\Type{int} \Func{sigsetjmp}(\Type{sigjmp\_buf}~\Var{env}, \Type{int}~\Var{savemask});\\
|
|
\Type{void} \Func{siglongjmp}(\Type{sigjmp\_buf}~\Var{env}, \Type{int}~\Var{val});\\
|
|
|
|
\section{Description}
|
|
|
|
The \Prog{unwind-setjmp} library offers a \Prog{libunwind}-based
|
|
implementation of non-local gotos. This implementation is intended to
|
|
be a drop-in replacement for the normal, system-provided routines of
|
|
the same name. The main advantage of using the \Prog{unwind-setjmp}
|
|
library is that setting up a non-local goto via one of the
|
|
\Func{setjmp}() routines is very fast. Typically, just 2 or 3 words
|
|
need to be saved in the jump-buffer (plus one call to
|
|
\Func{sigprocmask}(2), in the case of \Func{sigsetjmp}). On the
|
|
other hand, executing a non-local goto by calling one of the
|
|
\Func{longjmp}() routines tends to be much slower than with the
|
|
system-provided routines. In fact, the time spent on a
|
|
\Func{longjmp}() will be proportional to the number of call frames
|
|
that exist between the points where \Func{setjmp}() and
|
|
\Func{longjmp}() were called. For this reason, the
|
|
\Prog{unwind-setjmp} library is beneficial primarily in applications
|
|
that frequently call \Func{setjmp}() but only rarely call
|
|
\Func{longjmp}().
|
|
|
|
\section{Caveats}
|
|
|
|
\begin{itemize}
|
|
\item The correct operation of this library depends on the presence of
|
|
correct unwind information. On newer platforms, this is rarely an
|
|
issue. On older platforms, care needs to be taken to
|
|
ensure that each of the functions whose stack frames may have to be
|
|
unwound during a \Func{longjmp}() have correct unwind information
|
|
(on those platforms, there is usually a compiler-switch, such as
|
|
\Opt{-funwind-tables}, to request the generation of unwind
|
|
information).
|
|
\item The contents of \Type{jmp\_buf} and \Type{sigjmp\_buf} as setup
|
|
and used by these routines is completely different from the ones
|
|
used by the system-provided routines. Thus, a jump-buffer created
|
|
by the libunwind-based \Func{setjmp}()/\Func{\_setjmp} may only be
|
|
used in a call to the libunwind-based
|
|
\Func{longjmp}()/\Func{\_longjmp}(). The analogous applies for
|
|
\Type{sigjmp\_buf} with \Func{sigsetjmp}() and \Func{siglongjmp}().
|
|
\end{itemize}
|
|
|
|
\section{Files}
|
|
|
|
\begin{Description}
|
|
\item[\Opt{-l}\File{unwind-setjmp}] The library an application should
|
|
be linked against to ensure it uses the libunwind-based non-local
|
|
goto routines.
|
|
\end{Description}
|
|
|
|
|
|
\section{See Also}
|
|
|
|
\SeeAlso{libunwind(3)},
|
|
setjmp(3), longjmp(3),
|
|
\_setjmp(3), \_longjmp(3),
|
|
sigsetjmp(3), siglongjmp(3)
|
|
|
|
\section{Author}
|
|
|
|
\noindent
|
|
David Mosberger-Tang\\
|
|
Email: \Email{dmosberger@gmail.com}\\
|
|
WWW: \URL{http://www.nongnu.org/libunwind/}.
|
|
\LatexManEnd
|
|
|
|
\end{document}
|