Mercurial > pub > dyncall > dyncall
diff doc/manual/callconvs/callconv_arm32.tex @ 148:12729fd52ab7
- performance improvement and more correct handling of arm32 armhf calls, not copying bogus data just to reserve spill area space
- added armhf callconv stack layout diagram to doc
| author | cslag |
|---|---|
| date | Sun, 11 Sep 2016 01:19:27 +0200 |
| parents | 4a64b733dc76 |
| children | 8402121e1737 |
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--- a/doc/manual/callconvs/callconv_arm32.tex Fri Sep 09 15:23:16 2016 +0200 +++ b/doc/manual/callconvs/callconv_arm32.tex Sun Sep 11 01:19:27 2016 +0200 @@ -333,6 +333,7 @@ \item parameters \textless=\ 32 bits are passed as 32 bit words \item structures and unions are passed by value, with the first four words of the parameters in r0-r3 @@@?check doc \item if return value is a structure, a pointer pointing to the return value's space is passed in r0, the first parameter in r1, etc. (see {\bf return values}) +\item callee spills, caller reserves spill area space, though \end{itemize} \paragraph{Return values} @@ -344,7 +345,37 @@ \item if return value is a structure, the caller allocates space for the return value on the stack in its frame and passes a pointer to it in r0 \end{itemize} +\paragraph{Stack layout} +Stack directly after function prolog:\\ + +\begin{figure}[h] +\begin{tabular}{5|3|1 1} +\hhline{~-~~} + & \vdots & & \\ +\hhline{~=~~} +register save area & \hspace{4cm} & & \mrrbrace{6}{caller's frame} \\ +\hhline{~-~~} +local data & & & \\ +\hhline{~-~~} +\mrlbrace{7}{parameter area} & r0-r3 & \mrrbrace{1}{spill area (if needed)} & \\ +\hhline{~-~~} + & \ldots & \mrrbrace{3}{stack parameters} & \\ + & \ldots & & \\ + & \ldots & & \\ +\hhline{~=~~} +register save area (with return address) & & & \mrrbrace{3}{current frame} \\ +\hhline{~-~~} +local data & & & \\ +\hhline{~-~~} +parameter area & \vdots & & \\ +\hhline{~-~~} +\end{tabular} +\caption{Stack layout on arm32 armhf} +\end{figure} + + +\newpage \subsubsection{Architectures}