MN10300: Save frame pointer in thread_info struct rather than global var
Save the current exception frame pointer in the thread_info struct rather than
in a global variable as the latter makes SMP tricky, especially when preemption
is also enabled.
This also replaces __frame with current_frame() and rearranges header file
inclusions to make it all compile.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
diff --git a/arch/mn10300/include/asm/thread_info.h b/arch/mn10300/include/asm/thread_info.h
index 2001cb6..aa07a4a 100644
--- a/arch/mn10300/include/asm/thread_info.h
+++ b/arch/mn10300/include/asm/thread_info.h
@@ -16,10 +16,6 @@
#include <asm/page.h>
-#ifndef __ASSEMBLY__
-#include <asm/processor.h>
-#endif
-
#define PREEMPT_ACTIVE 0x10000000
#ifdef CONFIG_4KSTACKS
@@ -38,10 +34,14 @@
* must also be changed
*/
#ifndef __ASSEMBLY__
+typedef struct {
+ unsigned long seg;
+} mm_segment_t;
struct thread_info {
struct task_struct *task; /* main task structure */
struct exec_domain *exec_domain; /* execution domain */
+ struct pt_regs *frame; /* current exception frame */
unsigned long flags; /* low level flags */
__u32 cpu; /* current CPU */
__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
@@ -55,6 +55,10 @@
__u8 supervisor_stack[0];
};
+#define thread_info_to_uregs(ti) \
+ ((struct pt_regs *) \
+ ((unsigned long)ti + THREAD_SIZE - sizeof(struct pt_regs)))
+
#else /* !__ASSEMBLY__ */
#ifndef __ASM_OFFSETS_H__
@@ -102,6 +106,12 @@
return ti;
}
+static inline __attribute__((const))
+struct pt_regs *current_frame(void)
+{
+ return current_thread_info()->frame;
+}
+
/* how to get the current stack pointer from C */
static inline unsigned long current_stack_pointer(void)
{