dyncall: doc/manual/callconvs/callconv

- doc: added syscall info to appendix, fixed broken literature link - cleanup, added missing forward declarations, ...

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-:d60728b1f4a1
+:c607d67cd6b8
 \item Linux PPC 64-bit ABI is specified in "64-bit PowerPC ELF Application Binary Interface Supplement"\cite{ppcelf64abi} which is based on "System V ABI".
 \end{itemize}
 \paragraph{\product{dyncall} support}
-\product{Dyncall} supports PowerPC (64bit) Big Endian and Little Endian ELF ABIs on System V systems (Linux, etc.), including syscalls. Mac OS X is not supported.
+\product{Dyncall} and \product{dyncallback} are supported for PowerPC (64bit)
+Big Endian and Little Endian ELF ABIs on System V systems. Mac OS X is not
+supported.\\
+\product{Dyncall} can also be used to issue syscalls by using the syscall
+number as target parameter and selecting the correct mode.
 \subsubsection{PPC64 ELF ABI}
 \paragraph{Registers and register usage}
 linkage area                      & \vdots                        &                                      &                               \\
 \end{tabular}
 \caption{Stack layout on ppc64 ELF ABI}
 \end{figure}
+\newpage
+\subsubsection{System V syscalls}
+\paragraph{Parameter passing}
+\begin{itemize}
+\item syscall is issued via the {\em sc} instruction
+\item kernel destroys registers r13
+\item syscall number is set in r0
+\item params are passed in registers r3 through r10
+\item no stack in use, meaning syscalls are in theory limited to eight arguments
+\item register r3 holds the return value, overflow flag in conditional register cr0 signals errors in syscall
+\end{itemize}

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