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| author | Peter Maydell <peter.maydell@linaro.org> | 2018-06-15 14:57:14 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2018-06-15 15:23:34 +0100 |
| commit | afa4f6653dca095f63f3fe7f2001e9334f5676c1 (patch) | |
| tree | 5d3b9c27711a2b3ef5eaa2635593921092e32ae9 /docs | |
| parent | 2948f0cde3974185ad22d6721438cf85df852877 (diff) | |
| download | qemu-afa4f6653dca095f63f3fe7f2001e9334f5676c1.zip qemu-afa4f6653dca095f63f3fe7f2001e9334f5676c1.tar.gz qemu-afa4f6653dca095f63f3fe7f2001e9334f5676c1.tar.bz2 | |
bswap: Add new stn_*_p() and ldn_*_p() memory access functions
There's a common pattern in QEMU where a function needs to perform
a data load or store of an N byte integer in a particular endianness.
At the moment this is handled by doing a switch() on the size and
calling the appropriate ld*_p or st*_p function for each size.
Provide a new family of functions ldn_*_p() and stn_*_p() which
take the size as an argument and do the switch() themselves.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180611171007.4165-2-peter.maydell@linaro.org
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/devel/loads-stores.rst | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/docs/devel/loads-stores.rst b/docs/devel/loads-stores.rst index 6a990cc..57d8c52 100644 --- a/docs/devel/loads-stores.rst +++ b/docs/devel/loads-stores.rst @@ -53,9 +53,24 @@ The ``_{endian}`` infix is omitted for target-endian accesses. The target endian accessors are only available to source files which are built per-target. +There are also functions which take the size as an argument: + +load: ``ldn{endian}_p(ptr, sz)`` + +which performs an unsigned load of ``sz`` bytes from ``ptr`` +as an ``{endian}`` order value and returns it in a uint64_t. + +store: ``stn{endian}_p(ptr, sz, val)`` + +which stores ``val`` to ``ptr`` as an ``{endian}`` order value +of size ``sz`` bytes. + + Regexes for git grep - ``\<ldf\?[us]\?[bwlq]\(_[hbl]e\)\?_p\>`` - ``\<stf\?[bwlq]\(_[hbl]e\)\?_p\>`` + - ``\<ldn_\([hbl]e\)?_p\>`` + - ``\<stn_\([hbl]e\)?_p\>`` ``cpu_{ld,st}_*`` ~~~~~~~~~~~~~~~~~ |