motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-12-17 21:26:13 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions

util/cacheflush.c: Update cache flushing mechanism for Emscripten

Browse source 
Although __builtin___clear_cache is used to flush the instruction cache for
a specified memory region, this operation doesn't apply to wasm, as its
memory isn't executable. Moreover, Emscripten does not support this builtin
and fails to compile it with the following error.

> fatal error: error in backend: llvm.clear_cache is not supported on wasm

To resolve this, this commit removes the call to __builtin___clear_cache for
Emscripten build.

Signed-off-by: Kohei Tokunaga <ktokunaga.mail@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Link: https://lore.kernel.org/r/2926a798fa52a3a5b11c3df4edd1643d2b7cdcb9.1745820062.git.ktokunaga.mail@gmail.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Kohei Tokunaga 2025-04-28 15:39:00 +09:00 • committed by Paolo Bonzini
parent 4cd5a25557
commit 4c7c051719
2 changed files with 11 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

4
util/cacheflush.c
View file

@ -229,6 +229,10 @@ static void __attribute__((constructor)) init_cache_info(void)
/* Caches are coherent and do not require flushing; symbol inline. */
#elif defined(EMSCRIPTEN)
/* Wasm doesn't have executable region of memory. */
#elif defined(__aarch64__) && !defined(CONFIG_WIN32)
/*
* For Windows, we use generic implementation of flush_idcache_range, that