x86_64-no_context_hook.patch

Linux-2.6.18内核调试工具补丁程序KGDB。

This adds a call to notify_die() in the "no context" portion of
do_page_fault() as someone on the chain might care and want to do a fixup.

Signed-off-by: Tom Rini <[e-mail]>

 arch/x86_64/mm/fault.c      |    4 ++++
 include/asm-x86_64/kdebug.h |    1 +
 2 files changed, 5 insertions(+)

Index: linux-2.6.15-rc4/arch/x86_64/mm/fault.c
===================================================================
--- linux-2.6.15-rc4.orig/arch/x86_64/mm/fault.c
+++ linux-2.6.15-rc4/arch/x86_64/mm/fault.c
@@ -506,6 +506,10 @@ no_context:
 	if (is_errata93(regs, address))
 		return; 
 
+	if (notify_die(DIE_PAGE_FAULT_NO_CONTEXT, "no context", regs,
+				error_code, 14, SIGSEGV) == NOTIFY_STOP)
+		return;
+
 /*
  * Oops. The kernel tried to access some bad page. We'll have to
  * terminate things with extreme prejudice.
Index: linux-2.6.15-rc4/include/asm-x86_64/kdebug.h
===================================================================
--- linux-2.6.15-rc4.orig/include/asm-x86_64/kdebug.h
+++ linux-2.6.15-rc4/include/asm-x86_64/kdebug.h
@@ -33,6 +33,7 @@ enum die_val { 
 	DIE_CALL,
 	DIE_NMI_IPI,
 	DIE_PAGE_FAULT,
+	DIE_PAGE_FAULT_NO_CONTEXT,
 }; 
 	
 static inline int notify_die(enum die_val val,char *str,struct pt_regs *regs,long err,int trap, int sig)