[MSan] Enable MSAN for aarch64

This patch enabled msan for aarch64 with 39-bit VMA and 42-bit VMA.
As defined by lib/msan/msan.h the memory layout used is for 39-bit is:

   00 0000 0000 - 40 0000 0000:  invalid
   40 0000 0000 - 43 0000 0000:  shadow
   43 0000 0000 - 46 0000 0000:  origin
   46 0000 0000 - 55 0000 0000:  invalid
   55 0000 0000 - 56 0000 0000:  app (low)
   56 0000 0000 - 70 0000 0000:  invalid
   70 0000 0000 - 80 0000 0000:  app (high)

And for 42-bit VMA:

   000 0000 0000 - 100 0000 0000:  invalid
   100 0000 0000 - 11b 0000 0000:  shadow
   11b 0000 0000 - 120 0000 0000:  invalid
   120 0000 0000 - 13b 0000 0000:  origin
   13b 0000 0000 - 2aa 0000 0000:  invalid
   2aa 0000 0000 - 2ab 0000 0000:  app (low)
   2ab 0000 0000 - 3f0 0000 0000:  invalid
   3f0 0000 0000 - 400 0000 0000:  app (high)

Most of tests are passing with exception of:

   * Linux/mallinfo.cc
   * chained_origin_limits.cc
   * dlerror.cc
   * param_tls_limit.cc
   * signal_stress_test.cc
   * nonnull-arg.cpp

The 'Linux/mallinfo.cc' is due the fact AArch64 returns the sret in 'x8'
instead of default first argument 'x1'.  So a function prototype that
aims  to mimic (by using first argument as the return of function) won't
work. For GCC one can make a register alias (register var asm ("r8")), but
for clang it detects is an unused variable and generate wrong code.

The 'chained_origin_limits' is probably due a wrong code generation,
since it fails only when origin memory is used
(-fsanitize-memory-track-origins=2) and only in the returned code
(return buf[50]).

The 'signal_streess_test' and 'nonnull-arg' are due currently missing variadic
argument handling in memory sanitizer code instrumentation on LLVM side.

Both 'dlerror' and 'param_tls_test' are unknown failures that require
further investigation.

All the failures are XFAIL for aarch64 for now.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@247809 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/sanitizer_common/sanitizer_common_syscalls.inc b/lib/sanitizer_common/sanitizer_common_syscalls.inc
index 5d4840f96..008e57745 100644
--- a/lib/sanitizer_common/sanitizer_common_syscalls.inc
+++ b/lib/sanitizer_common/sanitizer_common_syscalls.inc
@@ -2301,7 +2301,7 @@ POST_SYSCALL(ni_syscall)(long res) {}
 PRE_SYSCALL(ptrace)(long request, long pid, long addr, long data) {
 #if !SANITIZER_ANDROID && \
     (defined(__i386) || defined(__x86_64) || defined(__mips64) || \
-     defined(__powerpc64__))
+     defined(__powerpc64__) || defined(__aarch64__))
   if (data) {
     if (request == ptrace_setregs) {
       PRE_READ((void *)data, struct_user_regs_struct_sz);
@@ -2322,7 +2322,7 @@ PRE_SYSCALL(ptrace)(long request, long pid, long addr, long data) {
 POST_SYSCALL(ptrace)(long res, long request, long pid, long addr, long data) {
 #if !SANITIZER_ANDROID && \
     (defined(__i386) || defined(__x86_64) || defined(__mips64) || \
-     defined(__powerpc64__))
+     defined(__powerpc64__) || defined(__aarch64__))
   if (res >= 0 && data) {
     // Note that this is different from the interceptor in
     // sanitizer_common_interceptors.inc.