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| 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 | d14c2c01392ded46ae2bc16aa6f08ab2594cc65c (patch) | |
| tree | 482909159cf1ff8ac31009bdb44ab17fe4fc04ab /compiler-rt/lib/builtins/clear_cache.c | |
| parent | 3989c9f96f73d8ac99a5597d5de8ca6687769a82 (diff) | |
| download | bcm5719-llvm-d14c2c01392ded46ae2bc16aa6f08ab2594cc65c.tar.gz bcm5719-llvm-d14c2c01392ded46ae2bc16aa6f08ab2594cc65c.zip | |
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.
llvm-svn: 280877
Diffstat (limited to 'compiler-rt/lib/builtins/clear_cache.c')
| -rw-r--r-- | compiler-rt/lib/builtins/clear_cache.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/compiler-rt/lib/builtins/clear_cache.c b/compiler-rt/lib/builtins/clear_cache.c index 55bbdd37589..4c2ac3b1eb0 100644 --- a/compiler-rt/lib/builtins/clear_cache.c +++ b/compiler-rt/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(); } |
