From 79fe28d2c4b78562de095c1843d8d3b1a1e7d2d7 Mon Sep 17 00:00:00 2001 From: Andreas Krebbel Date: Thu, 4 Nov 2021 19:37:19 +0100 Subject: [PATCH] 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. --- 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 fb16a45..186c5c6 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). */ -- 2.7.4