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Diffstat (limited to 'c/src/lib/libmisc/stackchk/README')
| -rw-r--r-- | c/src/lib/libmisc/stackchk/README | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/c/src/lib/libmisc/stackchk/README b/c/src/lib/libmisc/stackchk/README index 20e76f07bc..0f6e2f2b10 100644 --- a/c/src/lib/libmisc/stackchk/README +++ b/c/src/lib/libmisc/stackchk/README @@ -2,12 +2,27 @@ # $Id$ # +Introduction +============ + This directory contains a stack bounds checker. It provides two primary features: + check for stack overflow at each context switch + provides an educated guess at each task's stack usage +Enabling +======== + +Add the stack checker extension to the initial user extension set. +If using confdefs.h to build your configuration table, this is +as simple as adding -DSTACK_CHECK_ON to the gcc command line which +compiles the file defining the configuration table. In the RTEMS +test suites and samples, this is always init.c + +Background +========== + The stack overflow check at context switch works by looking for a 16 byte pattern at the logical end of the stack to be corrupted. The "guesser" assumes that the entire stack was prefilled with a known |