From: Andreas Krebbel <krebbel@linux.ibm.com>
Date: Thu, 4 Nov 2021 18:37:19 +0000 (+0100)
Subject: IBM Z: Define STACK_CHECK_MOVING_SP
X-Git-Tag: basepoints/gcc-13~3387
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=79fe28d2c4b78562de095c1843d8d3b1a1e7d2d7;p=thirdparty%2Fgcc.git

IBM Z: Define STACK_CHECK_MOVING_SP

With -fstack-check the stack probes emitted access memory below the
stack pointer.

gcc/ChangeLog:

	* config/s390/s390.h (STACK_CHECK_MOVING_SP): New macro
	definition.
---

diff --git a/gcc/config/s390/s390.h b/gcc/config/s390/s390.h
index fb16a455a035..186c5c6200bc 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).  */