Add implicit null and stack checks for x86
This adds compiler and runtime changes for x86
implicit checks. 32 bit only.
Both host and target are supported.
By default, on the host, the implicit checks are null pointer and
stack overflow. Suspend is implemented but not switched on.
Change-Id: I88a609e98d6bf32f283eaa4e6ec8bbf8dc1df78a
diff --git a/runtime/thread_linux.cc b/runtime/thread_linux.cc
index ee66ccc..518211b 100644
--- a/runtime/thread_linux.cc
+++ b/runtime/thread_linux.cc
@@ -35,8 +35,8 @@
void Thread::SetUpAlternateSignalStack() {
// Create and set an alternate signal stack.
stack_t ss;
- ss.ss_sp = new uint8_t[SIGSTKSZ];
- ss.ss_size = SIGSTKSZ;
+ ss.ss_sp = new uint8_t[SIGSTKSZ * 2]; // NB. this is 16K.
+ ss.ss_size = SIGSTKSZ * 2;
ss.ss_flags = 0;
CHECK(ss.ss_sp != NULL);
SigAltStack(&ss, NULL);
@@ -56,7 +56,7 @@
// Tell the kernel to stop using it.
ss.ss_sp = NULL;
ss.ss_flags = SS_DISABLE;
- ss.ss_size = SIGSTKSZ; // Avoid ENOMEM failure with Mac OS' buggy libc.
+ ss.ss_size = SIGSTKSZ * 2; // Avoid ENOMEM failure with Mac OS' buggy libc.
SigAltStack(&ss, NULL);
// Free it.