Clear the icache on arm

1 files changed, 4 insertions, 0 deletions

diff --git a/yjit.c b/yjit.c
index 0dddcfdc5a..a0c5c09091 100644
--- a/yjit.c
+++ b/yjit.c
@@ -78,6 +78,10 @@ rb_yjit_mark_executable(void *mem_block, uint32_t mem_size)
         rb_bug("Couldn't make JIT page (%p, %lu bytes) executable, errno: %s\n",
             mem_block, (unsigned long)mem_size, strerror(errno));
     }
+
+    // Clear/invalidate the instruction cache. Compiles to nothing on x86_64
+    // but required on ARM. On Darwin it's the same as calling sys_icache_invalidate().
+    __builtin___clear_cache(mem_block, (char *)mem_block + mem_size);
 }
 
 # define PTR2NUM(x)   (rb_int2inum((intptr_t)(void *)(x)))