Mercurial > pub > dyncall > dyncall
comparison doc/manual/callconvs/callconv_ppc32.tex @ 238:05181c5a6edd
- ppc32 doc tweak
| author | Tassilo Philipp |
|---|---|
| date | Tue, 02 May 2017 03:00:55 +0200 |
| parents | f1fc1c836baf |
| children | cde7b1f3b8f2 |
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| 237:98503af08916 | 238:05181c5a6edd |
|---|---|
| 47 Name & Brief description\\ | 47 Name & Brief description\\ |
| 48 \hline | 48 \hline |
| 49 {\bf gpr0} & scratch\\ | 49 {\bf gpr0} & scratch\\ |
| 50 {\bf gpr1} & stack pointer\\ | 50 {\bf gpr1} & stack pointer\\ |
| 51 {\bf gpr2} & scratch\\ | 51 {\bf gpr2} & scratch\\ |
| 52 {\bf gpr3} & return value, parameter 0 if integer or pointer\\ | 52 {\bf gpr3,gpr4} & return value, parameter 0 and 1 for integer or pointer\\ |
| 53 {\bf gpr4-gpr10} & return value, parameter 1-7 for integer or pointer parameters\\ | 53 {\bf gpr5-gpr10} & parameter 2-7 for integer or pointer parameters\\ |
| 54 {\bf gpr11} & permanent\\ | 54 {\bf gpr11} & permanent\\ |
| 55 {\bf gpr12} & branch target for dynamic code generation\\ | 55 {\bf gpr12} & branch target for dynamic code generation\\ |
| 56 {\bf gpr13-31} & permanent\\ | 56 {\bf gpr13-31} & permanent\\ |
| 57 {\bf fpr0} & scratch\\ | 57 {\bf fpr0} & scratch\\ |
| 58 {\bf fpr1-fpr13} & parameter 0-12 for floating point (always double precision)\\ | 58 {\bf fpr1} & floating point return value, floating point parameter 0 (always double precision)\\ |
| 59 {\bf fpr2-fpr13} & floating point parameters 1-12 (always double precision)\\ | |
| 59 {\bf fpr14-fpr31} & permanent\\ | 60 {\bf fpr14-fpr31} & permanent\\ |
| 60 {\bf v0-v1} & scratch\\ | 61 {\bf v0-v1} & scratch\\ |
| 61 {\bf v2-v13} & vector parameters\\ | 62 {\bf v2-v13} & vector parameters\\ |
| 62 {\bf v14-v19} & scratch\\ | 63 {\bf v14-v19} & scratch\\ |
| 63 {\bf v20-v31} & permanent\\ | 64 {\bf v20-v31} & permanent\\ |
| 71 \end{table} | 72 \end{table} |
| 72 | 73 |
| 73 \paragraph{Parameter passing} | 74 \paragraph{Parameter passing} |
| 74 | 75 |
| 75 \begin{itemize} | 76 \begin{itemize} |
| 76 \item stack parameter order: right-to-left@@@? | 77 \item stack parameter order: right-to-left |
| 77 \item caller cleans up the stack@@@? | 78 \item caller cleans up the stack |
| 78 \item the first 8 integer parameters are passed in registers gpr3-gpr10 | 79 \item the first 8 integer parameters are passed in registers gpr3-gpr10 |
| 79 \item the first 12 floating point parameters are passed in registers fpr1-fpr13 | 80 \item the first 12 floating point parameters are passed in registers fpr1-fpr13 |
| 80 \item if a float parameter is passed via a register, gpr registers are skipped for subsequent integer parameters (based on the size of | 81 \item if a float parameter is passed via a register, gpr registers are skipped for subsequent integer parameters (based on the size of |
| 81 the float - 1 register for single precision and 2 for double precision floating point values) | 82 the float - 1 register for single precision and 2 for double precision floating point values) |
| 82 \item the caller pushes subsequent parameters onto the stack | 83 \item the caller pushes subsequent parameters onto the stack |