Mercurial > pub > dyncall > dyncall
comparison doc/manual/callconvs/callconv_arm32.tex @ 42:ecc9403e214a r0.9-RC3
- final touch for complete armhf callback support, yay
- armhf doc updates
| author | cslag |
|---|---|
| date | Fri, 18 Dec 2015 23:28:18 +0100 |
| parents | 00310bf92924 |
| children | e5cdf4b4d813 |
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| 41:00310bf92924 | 42:ecc9403e214a |
|---|---|
| 303 \begin{table}[h] | 303 \begin{table}[h] |
| 304 \begin{tabular}{3 B} | 304 \begin{tabular}{3 B} |
| 305 \hline | 305 \hline |
| 306 Name & Brief description\\ | 306 Name & Brief description\\ |
| 307 \hline | 307 \hline |
| 308 {\bf R0} & parameter 0, scratch, return value\\ | 308 {\bf R0} & parameter 0, scratch, non floating point return value\\ |
| 309 {\bf R1} & parameter 1, scratch, return value\\ | 309 {\bf R1} & parameter 1, scratch, non floating point return value\\ |
| 310 {\bf R2,R3} & parameters 2 and 3, scratch\\ | 310 {\bf R2,R3} & parameters 2 and 3, scratch\\ |
| 311 {\bf R4,R5} & permanent\\ | 311 {\bf R4,R5} & permanent\\ |
| 312 {\bf R6} & scratch\\ | 312 {\bf R6} & scratch\\ |
| 313 {\bf R7} & frame pointer, permanent\\ | 313 {\bf R7} & frame pointer, permanent\\ |
| 314 {\bf R8} & permanent\\ | 314 {\bf R8} & permanent\\ |
| 317 {\bf R12} & scratch, intra-procedure scratch register (IP) used by dynamic linker\\ | 317 {\bf R12} & scratch, intra-procedure scratch register (IP) used by dynamic linker\\ |
| 318 {\bf R13} & stack pointer, permanent\\ | 318 {\bf R13} & stack pointer, permanent\\ |
| 319 {\bf R14} & link register, permanent\\ | 319 {\bf R14} & link register, permanent\\ |
| 320 {\bf R15} & program counter (note: due to pipeline, r15 points to 2 instructions ahead)\\ | 320 {\bf R15} & program counter (note: due to pipeline, r15 points to 2 instructions ahead)\\ |
| 321 {\bf CPSR} & Program status register\\ | 321 {\bf CPSR} & Program status register\\ |
| 322 {\bf S0-S15} & floating point arguments, single precision\\ | 322 {\bf S0} & floating point argument, floating point return value, single precision\\ |
| 323 {\bf D0-D7} & aliases S0-S15, floating point arguments, double precision\\ | 323 {\bf D0} & floating point argument, floating point return value, double precision, aliases S0-S1, \\ |
| 324 {\bf S1-S15} & floating point arguments, single precision\\ | |
| 325 {\bf D1-D7} & aliases S2-S15, floating point arguments, double precision\\ | |
| 324 {\bf FPSCR} & VFP status register.\\ | 326 {\bf FPSCR} & VFP status register.\\ |
| 325 \hline | 327 \hline |
| 326 \end{tabular} | 328 \end{tabular} |
| 327 \caption{Register usage on armhf} | 329 \caption{Register usage on armhf} |
| 328 \end{table} | 330 \end{table} |
| 341 \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}) | 343 \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}) |
| 342 \end{itemize} | 344 \end{itemize} |
| 343 | 345 |
| 344 \paragraph{Return values} | 346 \paragraph{Return values} |
| 345 \begin{itemize} | 347 \begin{itemize} |
| 346 \item return values \textless=\ 32 bits use r0 | 348 \item non floating point return values \textless=\ 32 bits use r0 |
| 347 \item 64 bit return values use r0 and r1 | 349 \item non floating point 64-bit return values use r0 and r1 |
| 350 \item single precision floating point return value uses s0 | |
| 351 \item double precision floating point return value uses d0 | |
| 348 \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 | 352 \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 |
| 349 \end{itemize} | 353 \end{itemize} |
| 350 | 354 |
| 351 | 355 |
| 352 | 356 |