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comparison doc/manual/callconvs/callconv_arm32.tex @ 45:e5cdf4b4d813

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- armhf callback fix for calls with >= 64byte of floating point params where d7 is filled before all args are pushed
author cslag
date Sat, 19 Dec 2015 23:24:35 +0100
parents ecc9403e214a
children c4de113dc1e9
comparison
equal deleted inserted replaced
44:b8f16ad80e34 45:e5cdf4b4d813
335 \item stack parameter order: right-to-left 335 \item stack parameter order: right-to-left
336 \item caller cleans up the stack 336 \item caller cleans up the stack
337 \item first four non-floating-point words are passed using r0-r3 337 \item first four non-floating-point words are passed using r0-r3
338 \item first 16 single-precision, or 8 double-precision arguments are passed via s0-s15 or d0-d7, respectively (note that since s and d registers are aliased, already used ones are skipped) 338 \item first 16 single-precision, or 8 double-precision arguments are passed via s0-s15 or d0-d7, respectively (note that since s and d registers are aliased, already used ones are skipped)
339 \item subsequent parameters are pushed onto the stack (in right to left order, such that the stack pointer points to the first of the remaining parameters) 339 \item subsequent parameters are pushed onto the stack (in right to left order, such that the stack pointer points to the first of the remaining parameters)
340 \item note that as soon as d7 is used, subsequent single precision floating point parameters are also pushed onto the stack, even if there are still free S* registers
340 \item if the callee takes the address of one of the parameters and uses it to address other parameters (e.g. varargs) it has to copy - in its prolog - the first four words to a reserved stack area adjacent to the other parameters on the stack @@@?check spilling of float args, also 341 \item if the callee takes the address of one of the parameters and uses it to address other parameters (e.g. varargs) it has to copy - in its prolog - the first four words to a reserved stack area adjacent to the other parameters on the stack @@@?check spilling of float args, also
341 \item parameters \textless=\ 32 bits are passed as 32 bit words 342 \item parameters \textless=\ 32 bits are passed as 32 bit words
342 \item structures and unions are passed by value, with the first four words of the parameters in r0-r3 @@@?check doc 343 \item structures and unions are passed by value, with the first four words of the parameters in r0-r3 @@@?check doc
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}) 344 \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})
344 \end{itemize} 345 \end{itemize}