aboutsummaryrefslogtreecommitdiff
path: root/arch/um/sys-i386/bugs.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/um/sys-i386/bugs.c')
-rw-r--r--arch/um/sys-i386/bugs.c46
1 files changed, 20 insertions, 26 deletions
diff --git a/arch/um/sys-i386/bugs.c b/arch/um/sys-i386/bugs.c
index fc991184850..b0cb05228a9 100644
--- a/arch/um/sys-i386/bugs.c
+++ b/arch/um/sys-i386/bugs.c
@@ -3,14 +3,12 @@
* Licensed under the GPL
*/
-#include <errno.h>
#include <signal.h>
-#include <string.h>
#include "kern_constants.h"
-#include "os.h"
+#include "longjmp.h"
#include "task.h"
#include "user.h"
-#include "sysdep/archsetjmp.h"
+#include "sysdep/ptrace.h"
/* Set during early boot */
int host_has_cmov = 1;
@@ -22,7 +20,7 @@ static void cmov_sigill_test_handler(int sig)
longjmp(cmov_test_return, 1);
}
-static void test_for_host_cmov(void)
+void arch_check_bugs(void)
{
struct sigaction old, new;
@@ -44,16 +42,7 @@ static void test_for_host_cmov(void)
sigaction(SIGILL, &old, &new);
}
-void arch_init_thread(void)
-{
-}
-
-void arch_check_bugs(void)
-{
- test_for_host_cmov();
-}
-
-int arch_handle_signal(int sig, struct uml_pt_regs *regs)
+void arch_examine_signal(int sig, struct uml_pt_regs *regs)
{
unsigned char tmp[2];
@@ -62,20 +51,25 @@ int arch_handle_signal(int sig, struct uml_pt_regs *regs)
* SIGILL in init.
*/
if ((sig != SIGILL) || (TASK_PID(get_current()) != 1))
- return 0;
+ return;
+
+ if (copy_from_user_proc(tmp, (void *) UPT_IP(regs), 2)) {
+ printk(UM_KERN_ERR "SIGILL in init, could not read "
+ "instructions!\n");
+ return;
+ }
- if (copy_from_user_proc(tmp, (void *) UPT_IP(regs), 2))
- panic("SIGILL in init, could not read instructions!\n");
if ((tmp[0] != 0x0f) || ((tmp[1] & 0xf0) != 0x40))
- return 0;
+ return;
if (host_has_cmov == 0)
- panic("SIGILL caused by cmov, which this processor doesn't "
- "implement, boot a filesystem compiled for older "
- "processors");
+ printk(UM_KERN_ERR "SIGILL caused by cmov, which this "
+ "processor doesn't implement. Boot a filesystem "
+ "compiled for older processors");
else if (host_has_cmov == 1)
- panic("SIGILL caused by cmov, which this processor claims to "
- "implement");
- else panic("Bad value for host_has_cmov (%d)", host_has_cmov);
- return 0;
+ printk(UM_KERN_ERR "SIGILL caused by cmov, which this "
+ "processor claims to implement");
+ else
+ printk(UM_KERN_ERR "Bad value for host_has_cmov (%d)",
+ host_has_cmov);
}