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[PATCH] UML: add generic BUG support

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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@addtoit.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeff Dike 2006-12-08 02:36:23 -08:00 committed by Linus Torvalds
parent c31a0bf3e1
commit e182c965b6
6 changed files with 50 additions and 3 deletions
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5
arch/um/Kconfig
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@ -47,6 +47,11 @@ 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

2
arch/um/sys-i386/Makefile
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@ -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

20
arch/um/sys-i386/bug.c Normal file
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@ -0,0 +1,20 @@
/*
* Copyright (C) 2006 Jeff Dike (jdike@addtoit.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;
}

2
arch/um/sys-x86_64/Makefile
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@ -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

20
arch/um/sys-x86_64/bug.c Normal file
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@ -0,0 +1,20 @@
/*
* Copyright (C) 2006 Jeff Dike (jdike@addtoit.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;
}

4
include/asm-um/bug.h
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@ -1,4 +1,6 @@
#ifndef __UM_BUG_H
#define __UM_BUG_H
#include <asm-generic/bug.h>
#include <asm/arch/bug.h>
#endif