Mercurial > pub > dyncall > dyncall
comparison doc/manual/callconvs/callconv_mips32.tex @ 304:6869d834a847
- mips32 doc
| author | Tassilo Philipp |
|---|---|
| date | Wed, 23 May 2018 11:39:40 +0200 |
| parents | d55f9d508074 |
| children | b104c5beec8b |
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| 303:c81374ac9fba | 304:6869d834a847 |
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| 123 \begin{tabular*}{0.95\textwidth}{lll} | 123 \begin{tabular*}{0.95\textwidth}{lll} |
| 124 Name & Alias & Brief description\\ | 124 Name & Alias & Brief description\\ |
| 125 \hline | 125 \hline |
| 126 {\bf \$0} & {\bf \$zero} & hardware zero \\ | 126 {\bf \$0} & {\bf \$zero} & hardware zero \\ |
| 127 {\bf \$1} & {\bf \$at} & assembler temporary \\ | 127 {\bf \$1} & {\bf \$at} & assembler temporary \\ |
| 128 {\bf \$2-\$3} & {\bf \$v0-\$v1} & return value (only integer, on hard-float targets), scratch \\ | 128 {\bf \$2-\$3} & {\bf \$v0-\$v1} & return value (only integer on hard-float targets), scratch \\ |
| 129 {\bf \$4-\$7} & {\bf \$a0-\$a3} & first arguments (only integer, on hard-float targets), scratch\\ | 129 {\bf \$4-\$7} & {\bf \$a0-\$a3} & first arguments (only integer on hard-float targets), scratch\\ |
| 130 {\bf \$8-\$15,\$24} & {\bf \$t0-\$t7,\$t8} & temporaries, scratch \\ | 130 {\bf \$8-\$15,\$24} & {\bf \$t0-\$t7,\$t8} & temporaries, scratch \\ |
| 131 {\bf \$25} & {\bf \$t9} & temporary, hold the address of the called function for all PIC calls (by convention) \\ | 131 {\bf \$25} & {\bf \$t9} & temporary, holds address of called function for PIC calls (by convention) \\ |
| 132 {\bf \$16-\$23} & {\bf \$s0-\$s7} & preserved \\ | 132 {\bf \$16-\$23} & {\bf \$s0-\$s7} & preserved \\ |
| 133 {\bf \$26,\$27} & {\bf \$k0,\$k1} & reserved for kernel \\ | 133 {\bf \$26,\$27} & {\bf \$k0,\$k1} & reserved for kernel \\ |
| 134 {\bf \$28} & {\bf \$gp} & global pointer, preserved by caller \\ | 134 {\bf \$28} & {\bf \$gp} & global pointer, preserved by caller \\ |
| 135 {\bf \$29} & {\bf \$sp} & stack pointer, preserve \\ | 135 {\bf \$29} & {\bf \$sp} & stack pointer, preserve \\ |
| 136 {\bf \$30} & {\bf \$fp} & frame pointer, preserve \\ | 136 {\bf \$30} & {\bf \$fp} & frame pointer, preserve \\ |
| 156 \item subsequent parameters are passed vie the stack | 156 \item subsequent parameters are passed vie the stack |
| 157 \item 64-bit params passed via registers are passed using either two registers (starting at an even register number, skipping an odd one if necessary), or via the stack using an 8-byte alignment | 157 \item 64-bit params passed via registers are passed using either two registers (starting at an even register number, skipping an odd one if necessary), or via the stack using an 8-byte alignment |
| 158 \item only on hard-float targets: if the very first call argument is a float, up to 2 floats or doubles can be passed via \$f12 and \$f14, respectively, for first and second argument | 158 \item only on hard-float targets: if the very first call argument is a float, up to 2 floats or doubles can be passed via \$f12 and \$f14, respectively, for first and second argument |
| 159 \item only on hard-float targets: if any arguments are passed via float registers, skip \$a0-\$a3 for subsequent arguments as if the values were passed via them | 159 \item only on hard-float targets: if any arguments are passed via float registers, skip \$a0-\$a3 for subsequent arguments as if the values were passed via them |
| 160 \item only on hard-float targets: note that if the first argument is not a float, but the second, it'll get passed via the \$a? registers | 160 \item only on hard-float targets: note that if the first argument is not a float, but the second, it'll get passed via the \$a? registers |
| 161 \item results are returned in \$v0 and \$v1, with \$v0 for all values < 64bit (only integer, on hard-float targets) | 161 \item results are returned in \$v0 and \$v1, with \$v0 for all values < 64bit (only integer on hard-float targets) |
| 162 \item only on hard-float targets: floating point results are returned in \$f0 (32-bit float), or \$f0 and \$f3 (64bit float) | 162 \item only on hard-float targets: floating point results are returned in \$f0 (32-bit float), or \$f0 and \$f3 (64bit float) |
| 163 \item single precision float parameters (32 bit) are right-justified in their 8-byte slot on the stack on big endian targets, as they aren't promoted @@@ | |
| 163 \end{itemize} | 164 \end{itemize} |
| 164 | 165 |
| 165 \paragraph{Stack layout} | 166 \paragraph{Stack layout} |
| 166 | 167 |
| 167 Stack directly after function prolog:\\ | 168 Stack directly after function prolog:\\ |