From: Marc Fiuczynski <mef@cs.princeton.edu>
Date: Thu, 28 Jun 2007 23:35:03 +0000 (+0000)
Subject: Proof of concept code I developed that we briefly deployed, but has
X-Git-Tag: linux-2.6-22-1~60
X-Git-Url: http://git.onelab.eu/?a=commitdiff_plain;h=af4864f83e4d2c06e4adfc7a1ac4b921c35e44c6;p=linux-2.6.git

Proof of concept code I developed that we briefly deployed, but has
not been used in at least two years.  There are probably other (better)
solutions out there for the same support.
---

diff --git a/arch/i386/kernel/dstack.S b/arch/i386/kernel/dstack.S
deleted file mode 100644
index cef679947..000000000
--- a/arch/i386/kernel/dstack.S
+++ /dev/null
@@ -1,63 +0,0 @@
-/*
- *  linux/arch/i386/dstack.S
- *
- *  Copyright (C) 2005 Marc E. Fiuczynski
- */
-
-/*
- * dstack.s contains the system specific support for stack overflows
- * and discontiguous stack support.
- */
-
-#include <linux/config.h>
-#include <linux/linkage.h>	
-#include <asm/thread_info.h>	
-#include <asm/errno.h>
-#include <asm/segment.h>
-#include <asm/smp.h>
-#include <asm/page.h>
-
-.data
-.globl stack_overflowed
-stack_overflowed:
-	.long 0
-.text
-
-ENTRY(mcount)
-#warning stack check enabled
-	push %eax
-	movl $(THREAD_SIZE - 1),%eax
-	andl %esp,%eax
-	cmpl $STACK_WARN,%eax
-	jle 1f
-2:
-	popl %eax
-	ret
-1:
-	/* prevent infinite recursion from call to mcount from the
-	 * stack_overflow function.  Need to revisit this code for
-	 * SMP based systems.
-	 */
-	lock; btsl $0,stack_overflowed
-	jc 2b
-
-	/* prepare to jmp to stack_overflow directly, as if it were 
-	 * called directly by the caller of mcount.  
-	 */
-	pushl %ebp
-	pushl %ebx
-	pushl %esi
-	pushl %edi
-	
-	call stack_overflow
-	/* Note that stack_overflow() will clear the stack_overflowed
-	 * variable.
-	 */
-
-	popl %edi
-	popl %esi
-	popl %ebx
-	popl %ebp
-	
-	popl %eax	
-	ret
diff --git a/arch/i386/kernel/dstackdump.c b/arch/i386/kernel/dstackdump.c
deleted file mode 100644
index 9aad728e7..000000000
--- a/arch/i386/kernel/dstackdump.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- *  linux/arch/i386/kernel/stackoverflow.c
- *
- *  Copyright (C) 2005  Marc E. Fiuczynski
- *
- */
-
-/*
- * This file handles the architecture-dependent parts of stack overflow handling...
- */
-
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/thread_info.h>
-#include <asm/processor.h>
-
-void dstackdump(void)
-{
-        unsigned long esp = current_stack_pointer();
-	int panicing = ((esp&(THREAD_SIZE-1)) <= STACK_PANIC);
-
-	oops_in_progress = 1;
-	printk( "esp: 0x%lx masked: 0x%lx STACK_PANIC:0x%lx %d %d\n",
-		esp, (esp&(THREAD_SIZE-1)), STACK_PANIC, 
-		(((esp&(THREAD_SIZE-1)) <= STACK_PANIC)), panicing);
-
-	show_trace(current,(void*)esp);
-
-	if (panicing)
-	  panic("stack overflow\n");
-
-	oops_in_progress = 0;
-
-	/* Just let it happen once per task, as otherwise it goes nuts
-	 * in printing stack traces.  This means that I need to dump
-	 * the stack_overflowed boolean into the task or thread_info
-	 * structure.  For now just turn it off all together.
-	 */
-
-	/* stack_overflowed = 0; */
-}
diff --git a/arch/i386/kernel/stackoverflow.c b/arch/i386/kernel/stackoverflow.c
deleted file mode 100644
index f9b9f6f90..000000000
--- a/arch/i386/kernel/stackoverflow.c
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- *  linux/arch/i386/kernel/stackoverflow.c
- *
- *  Copyright (C) 2005  Marc E. Fiuczynski
- *
- */
-
-/*
- * This file handles the architecture-dependent parts of stack overflow handling...
- */
-
-#include <linux/kernel.h>
-#include <linux/thread_info.h>
-#include <linux/sched.h>
-#include <asm/processor.h>
-
-void stack_overflow(void)
-{
-        unsigned long esp = current_stack_pointer();
-	int panicing = ((esp&(THREAD_SIZE-1)) <= STACK_PANIC);
-
-	oops_in_progress = 1;
-	printk( "esp: 0x%lx masked: 0x%lx STACK_PANIC:0x%lx %d %d\n",
-		esp, (esp&(THREAD_SIZE-1)), STACK_PANIC, 
-		(((esp&(THREAD_SIZE-1)) <= STACK_PANIC)), panicing);
-	show_trace(current,(void*)esp);
-
-	if (panicing)
-	  panic("stack overflow\n");
-
-	oops_in_progress = 0;
-
-	/* Just let it happen once per task, as otherwise it goes nuts
-	 * in printing stack traces.  This means that I need to dump
-	 * the stack_overflowed boolean into the task or thread_info
-	 * structure.  For now just turn it off all together.
-	 */
-
-	/* stack_overflowed = 0; */
-}