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* [gcc r12-4926] IBM Z: Define STACK_CHECK_MOVING_SP
@ 2021-11-04 18:40 Andreas Krebbel
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From: Andreas Krebbel @ 2021-11-04 18:40 UTC (permalink / raw)
  To: gcc-cvs

https://gcc.gnu.org/g:79fe28d2c4b78562de095c1843d8d3b1a1e7d2d7

commit r12-4926-g79fe28d2c4b78562de095c1843d8d3b1a1e7d2d7
Author: Andreas Krebbel <krebbel@linux.ibm.com>
Date:   Thu Nov 4 19:37:19 2021 +0100

    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:
---
 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).  */


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