commit e2faf8970804e61bd3fb8ab5427ad112999690b4
author Youling Tang <tangyouling@loongson.cn> Tue Nov 01 20:14:06 2022 +0800
committer Copybara-Service <copybara-worker@google.com> Tue Nov 01 05:21:31 2022 -0700
tree 9674829705d77cbaf6384381ff19a9062f4c70f1
parent 55f2db4bc5f9b0969ebd0ff3f240e9b89bc903ea

[builtins][LoongArch] Port __clear_cache to LoongArch Linux

There are two failures in the current builtins,
Failed Tests (2):
  Builtins-loongarch64-linux :: clear_cache_test.c
  Builtins-loongarch64-linux :: enable_execute_stack_test.c

It is caused by __clear_cache not being implemented and triggering `abort`.

"__clear_cache" is implemented in the same way as "clear_cache" in gcc (
in gcc/config/loongarch/loongarch.md)

Differential Revision: https://reviews.llvm.org/D136921

GitOrigin-RevId: 5b27578fc52bdf06e2d81a271705a39266b047fe

lib/builtins/clear_cache.c

diff --git a/lib/builtins/clear_cache.c b/lib/builtins/clear_cache.c
index 9816940..bcc5922 100644
--- a/lib/builtins/clear_cache.c
+++ b/lib/builtins/clear_cache.c
@@ -91,6 +91,8 @@
 #else
   compilerrt_abort();
 #endif
+#elif defined(__linux__) && defined(__loongarch__)
+  __asm__ volatile("ibar 0");
 #elif defined(__linux__) && defined(__mips__)
   const uintptr_t start_int = (uintptr_t)start;
   const uintptr_t end_int = (uintptr_t)end;