diff options
| author | Andreas Krebbel <krebbel1@de.ibm.com> | 2005-10-19 11:00:03 +0000 |
|---|---|---|
| committer | Andreas Krebbel <krebbel@gcc.gnu.org> | 2005-10-19 11:00:03 +0000 |
| commit | f695eccf71367a91aa87a4ff5a61d365da305d94 (patch) | |
| tree | 8bf9f0bec953868197c70df044f850d5f8d177c9 | |
| parent | d1f36c51be6d9560caa7931e970bd1905da2ebe5 (diff) | |
| download | gcc-f695eccf71367a91aa87a4ff5a61d365da305d94.zip gcc-f695eccf71367a91aa87a4ff5a61d365da305d94.tar.gz gcc-f695eccf71367a91aa87a4ff5a61d365da305d94.tar.bz2 | |
s390.c (override_options): Added check for -mstack-size 64k limitation.
2005-10-19 Andreas Krebbel <krebbel1@de.ibm.com>
* config/s390/s390.c (override_options): Added check for -mstack-size
64k limitation.
* doc/invoke.texi: Mention that limit in the documenation.
From-SVN: r105609
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/config/s390/s390.c | 2 | ||||
| -rw-r--r-- | gcc/doc/invoke.texi | 5 |
3 files changed, 11 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index c032c98..2b626a3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2005-10-19 Andreas Krebbel <krebbel1@de.ibm.com> + + * config/s390/s390.c (override_options): Added check for -mstack-size + 64k limitation. + * doc/invoke.texi: Mention that limit in the documenation. + 2005-10-18 Paolo Bonzini <bonzini@gnu.org> PR #19672 diff --git a/gcc/config/s390/s390.c b/gcc/config/s390/s390.c index 5284db1..7c0d984 100644 --- a/gcc/config/s390/s390.c +++ b/gcc/config/s390/s390.c @@ -1385,6 +1385,8 @@ override_options (void) error ("-mstack-size implies use of -mstack-guard"); else if (s390_stack_guard >= s390_stack_size) error ("stack size must be greater than the stack guard value"); + else if (s390_stack_size > 1 << 16) + error ("stack size must not be greater than 64k"); } else if (s390_stack_guard) error ("-mstack-guard implies use of -mstack-size"); diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 4d8e67a..8bbbb04 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -11659,9 +11659,10 @@ back end emits additional instructions in the function prologue which trigger a if the stack size is @var{stack-guard} bytes above the @var{stack-size} (remember that the stack on s390 grows downward). These options are intended to be used to help debugging stack overflow problems. The additionally emitted code -cause only little overhead and hence can also be used in production like systems +causes only little overhead and hence can also be used in production like systems without greater performance degradation. The given values have to be exact -powers of 2 and @var{stack-size} has to be greater than @var{stack-guard}. +powers of 2 and @var{stack-size} has to be greater than @var{stack-guard} without +exceeding 64k. In order to be efficient the extra code makes the assumption that the stack starts at an address aligned to the value given by @var{stack-size}. @end table |