With -fstack-check the stack probes emitted access memory below the
stack pointer.
Bootstrapped and regression tested on s390x.
Committed to mainline
gcc/ChangeLog:
* config/s390/s390.h (STACK_CHECK_MOVING_SP): New macro
definition.
---
gcc/config/s390/s390.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/gcc/config/s390/s390.h b/gcc/config/s390/s390.h
index fb16a455a03..186c5c6200b 100644
--- a/gcc/config/s390/s390.h
+++ b/gcc/config/s390/s390.h
@@ -332,6 +332,11 @@ extern const char *s390_host_detect_local_cpu (int argc,
const char **argv);
#define STACK_SIZE_MODE (Pmode)
+/* Make the stack pointer to be moved downwards while issuing stack probes with
+ -fstack-check. We need this to prevent memory below the stack pointer from
+ being accessed. */
+#define STACK_CHECK_MOVING_SP 1
+
#ifndef IN_LIBGCC2
/* Width of a word, in units (bytes). */
--
2.31.1
