Mercurial > pub > dyncall > dyncall
comparison doc/manual/callconvs/callconv_x64.tex @ 340:6e33db95e724
- syscall infos in doc
| author | Tassilo Philipp |
|---|---|
| date | Sat, 04 Jan 2020 22:48:51 +0100 |
| parents | 74c056b597b7 |
| children | c607d67cd6b8 |
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| 339:4f9f49fb82ce | 340:6e33db95e724 |
|---|---|
| 44 | 44 |
| 45 | 45 |
| 46 | 46 |
| 47 \paragraph{\product{dyncall} support} | 47 \paragraph{\product{dyncall} support} |
| 48 | 48 |
| 49 \product{dyncall} supports the MS Windows and System V calling convention.\\ | 49 Currently, the MS Windows and System V calling conventions are supported.\\ |
| 50 \\ | 50 \product{Dyncall} can also be used to issue syscalls on System V platforms by |
| 51 | 51 using the syscall number as target parameter and selecting the correct mode. |
| 52 | |
| 53 | 52 |
| 54 \subsubsection{MS Windows} | 53 \subsubsection{MS Windows} |
| 55 | 54 |
| 56 \paragraph{Registers and register usage} | 55 \paragraph{Registers and register usage} |
| 57 | 56 |
| 239 & \vdots & & \\ | 238 & \vdots & & \\ |
| 240 \end{tabular} | 239 \end{tabular} |
| 241 \caption{Stack layout on x64 System V (Linux/*BSD)} | 240 \caption{Stack layout on x64 System V (Linux/*BSD)} |
| 242 \end{figure} | 241 \end{figure} |
| 243 | 242 |
| 243 | |
| 244 \newpage | |
| 245 | |
| 246 \subsubsection{System V syscalls} | |
| 247 | |
| 248 \paragraph{Parameter passing} | |
| 249 | |
| 250 \begin{itemize} | |
| 251 \item syscall is issued via the {\em syscall} instruction | |
| 252 \item kernel destroys registers rcx and r11 | |
| 253 \item syscall number is set in rax | |
| 254 \item up to 6 params are passed in the following registers in this order: rdi, rsi, rdx, rcx, r8, r9 | |
| 255 \item no stack in use, meaning syscalls are limited to six arguments | |
| 256 \item register rax holds the return value (values in between -4095 and -1 indicate errors) | |
| 257 \end{itemize} | |
| 258 |