overkill: use segments to catch stack overflow (delete before next year)

1 files changed, 4 insertions, 1 deletions

diff --git a/proc.h b/proc.h
index 57fb4d9..285f6bf 100644
--- a/proc.h
+++ b/proc.h
@@ -4,7 +4,9 @@
 #define SEG_UCODE 3
 #define SEG_UDATA 4
 #define SEG_TSS   5  // this process's task state
-#define NSEGS     6
+#define SEG_CPUSTACK 6
+#define SEG_PROCSTACK 7
+#define NSEGS     8
 
 // Saved registers for kernel context switches.
 // Don't need to save all the %fs etc. segment registers,
@@ -22,6 +24,7 @@ struct context {
   int esi;
   int edi;
   int ebp;
+  int ss;
 };
 
 enum proc_state { UNUSED, EMBRYO, SLEEPING, RUNNABLE, RUNNING, ZOMBIE };