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Date: Tue, 03 Oct 2006 18:56:46 -0400
From: Jeff Dike <jdike@...toit.com>
To: akpm@...l.org
cc: linux-kernel@...r.kernel.org,
user-mode-linux-devel@...ts.sourceforge.net
Subject: [PATCH] UML - add generic BUG support
The BUG changes in -mm3 need some arch support. This patch adds the UML
support needed. For the most part, it was stolen from the underlying
architecture. The exception is the kernel eip < PAGE_OFFSET test, which is
wrong for skas mode UMLs.
Signed-off-by: Jeff Dike <jdike@...toit.com>
---
arch/um/Kconfig | 5 +++++
arch/um/sys-i386/Makefile | 2 +-
arch/um/sys-i386/bug.c | 20 ++++++++++++++++++++
arch/um/sys-x86_64/Makefile | 2 +-
arch/um/sys-x86_64/bug.c | 20 ++++++++++++++++++++
include/asm-um/bug.h | 4 +++-
6 files changed, 50 insertions(+), 3 deletions(-)
Index: linux-2.6.18-mm/arch/um/Kconfig
===================================================================
--- linux-2.6.18-mm.orig/arch/um/Kconfig 2006-10-03 12:46:44.000000000 -0400
+++ linux-2.6.18-mm/arch/um/Kconfig 2006-10-03 17:44:32.000000000 -0400
@@ -29,6 +29,11 @@ config GENERIC_CALIBRATE_DELAY
bool
default y
+config GENERIC_BUG
+ bool
+ default y
+ depends on BUG
+
# Used in kernel/irq/manage.c and include/linux/irq.h
config IRQ_RELEASE_METHOD
bool
Index: linux-2.6.18-mm/include/asm-um/bug.h
===================================================================
--- linux-2.6.18-mm.orig/include/asm-um/bug.h 2006-06-17 21:49:35.000000000 -0400
+++ linux-2.6.18-mm/include/asm-um/bug.h 2006-10-03 13:29:28.000000000 -0400
@@ -1,4 +1,6 @@
#ifndef __UM_BUG_H
#define __UM_BUG_H
-#include <asm-generic/bug.h>
+
+#include <asm/arch/bug.h>
+
#endif
Index: linux-2.6.18-mm/arch/um/sys-i386/Makefile
===================================================================
--- linux-2.6.18-mm.orig/arch/um/sys-i386/Makefile 2006-10-03 12:53:13.000000000 -0400
+++ linux-2.6.18-mm/arch/um/sys-i386/Makefile 2006-10-03 17:44:32.000000000 -0400
@@ -1,4 +1,4 @@
-obj-y = bugs.o checksum.o delay.o fault.o ksyms.o ldt.o ptrace.o \
+obj-y = bug.o bugs.o checksum.o delay.o fault.o ksyms.o ldt.o ptrace.o \
ptrace_user.o setjmp.o signal.o sigcontext.o syscalls.o sysrq.o \
sys_call_table.o tls.o
Index: linux-2.6.18-mm/arch/um/sys-i386/bug.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.18-mm/arch/um/sys-i386/bug.c 2006-10-03 13:45:39.000000000 -0400
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2006 Jeff Dike (jdike@...toit.com)
+ * Licensed under the GPL V2
+ */
+
+#include <linux/uaccess.h>
+
+/* Mostly copied from i386/x86_86 - eliminated the eip < PAGE_OFFSET because
+ * that's not relevent in skas mode.
+ */
+
+int is_valid_bugaddr(unsigned long eip)
+{
+ unsigned short ud2;
+
+ if (probe_kernel_address((unsigned short __user *)eip, ud2))
+ return 0;
+
+ return ud2 == 0x0b0f;
+}
Index: linux-2.6.18-mm/arch/um/sys-x86_64/Makefile
===================================================================
--- linux-2.6.18-mm.orig/arch/um/sys-x86_64/Makefile 2006-10-03 12:53:13.000000000 -0400
+++ linux-2.6.18-mm/arch/um/sys-x86_64/Makefile 2006-10-03 17:44:32.000000000 -0400
@@ -4,7 +4,7 @@
# Licensed under the GPL
#
-obj-y = bugs.o delay.o fault.o ldt.o mem.o ptrace.o ptrace_user.o \
+obj-y = bug.o bugs.o delay.o fault.o ldt.o mem.o ptrace.o ptrace_user.o \
setjmp.o sigcontext.o signal.o syscalls.o syscall_table.o sysrq.o \
ksyms.o tls.o
Index: linux-2.6.18-mm/arch/um/sys-x86_64/bug.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.18-mm/arch/um/sys-x86_64/bug.c 2006-10-03 13:45:53.000000000 -0400
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2006 Jeff Dike (jdike@...toit.com)
+ * Licensed under the GPL V2
+ */
+
+#include <linux/uaccess.h>
+
+/* Mostly copied from i386/x86_86 - eliminated the eip < PAGE_OFFSET because
+ * that's not relevent in skas mode.
+ */
+
+int is_valid_bugaddr(unsigned long eip)
+{
+ unsigned short ud2;
+
+ if (probe_kernel_address((unsigned short __user *)eip, ud2))
+ return 0;
+
+ return ud2 == 0x0b0f;
+}
-
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