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| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2011-02-27 05:36:54 +0100 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2011-02-27 05:36:54 +0100 |
| commit | aa0c4071694a19b0f7de5fcaca8b1f9918e06fc8 (patch) | |
| tree | 0d5bad5f1baa77fdda46ecbe476f7d55a51eb214 /i386 | |
| parent | a9ad81b8d42190ff10aa0ce72bdf31bb313408b1 (diff) | |
Detect interrupt overflow
* i386/i386/locore.S (int_from_instack): Check %esp against _intstack, issue
ud2 on stack overflow.
Diffstat (limited to 'i386')
| -rw-r--r-- | i386/i386/locore.S | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/i386/i386/locore.S b/i386/i386/locore.S index c1e6448..d2c600a 100644 --- a/i386/i386/locore.S +++ b/i386/i386/locore.S @@ -704,6 +704,8 @@ LEXT(return_to_iret) /* ( label for kdb_kintr and hardclock) */ iret /* return to caller */ int_from_intstack: + cmpl $EXT(_intstack),%esp /* seemingly looping? */ + jb stack_overflowed /* if not: */ call EXT(interrupt) /* call interrupt routine */ _return_to_iret_i: /* ( label for kdb_kintr) */ pop %edx /* must have been on kernel segs */ @@ -711,6 +713,9 @@ _return_to_iret_i: /* ( label for kdb_kintr) */ pop %eax /* no ASTs */ iret +stack_overflowed: + ud2 + /* * Take an AST from an interrupt. * On PCB stack. |