diff options
| author | Saleem Abdulrasool <compnerd@compnerd.org> | 2016-09-07 22:59:54 +0000 |
|---|---|---|
| committer | Saleem Abdulrasool <compnerd@compnerd.org> | 2016-09-07 22:59:54 +0000 |
| commit | ff75f2a0260b1940436a483413091c5770427c04 (patch) | |
| tree | 76d4b80b0115104b0242673195b817084ca476f1 /lib/builtins/clear_cache.c | |
| parent | 4febb1f485cda52639b5d33bfd69785a9abcea19 (diff) | |
builtins: make sure that flags is setup properly for __clear_cache
On Linux ARM, the syscall will take 3 arguments (start, end, flags). Ensure
that we do not pass garbage to the flags, which can cause the cacheflush call to
fail, and therefore cause an abort at runtime.
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@280877 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/builtins/clear_cache.c')
| -rw-r--r-- | lib/builtins/clear_cache.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/builtins/clear_cache.c b/lib/builtins/clear_cache.c index 55bbdd375..4c2ac3b1e 100644 --- a/lib/builtins/clear_cache.c +++ b/lib/builtins/clear_cache.c @@ -110,10 +110,12 @@ void __clear_cache(void *start, void *end) { #elif defined(__linux__) register int start_reg __asm("r0") = (int) (intptr_t) start; const register int end_reg __asm("r1") = (int) (intptr_t) end; + const register int flags __asm("r2") = 0; const register int syscall_nr __asm("r7") = __ARM_NR_cacheflush; __asm __volatile("svc 0x0" : "=r"(start_reg) - : "r"(syscall_nr), "r"(start_reg), "r"(end_reg)); + : "r"(syscall_nr), "r"(start_reg), "r"(end_reg), + "r"(flags)); if (start_reg != 0) { compilerrt_abort(); } |