forked from Minki/linux
534e3adbd2
In some cases gcc >= 4.5.2 will optimize away current_thread_info(). To prevent gcc from doing so the stack address has to be obtained via inline asm. Signed-off-by: Richard Weinberger <richard@nod.at> Acked-by: Kirill A. Shutemov <kirill@shutemov.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#ifndef __UM_THREAD_INFO_H
|
|
#define __UM_THREAD_INFO_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <asm/types.h>
|
|
#include <asm/page.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
struct thread_info {
|
|
struct task_struct *task; /* main task structure */
|
|
struct exec_domain *exec_domain; /* execution domain */
|
|
unsigned long flags; /* low level flags */
|
|
__u32 cpu; /* current CPU */
|
|
int preempt_count; /* 0 => preemptable,
|
|
<0 => BUG */
|
|
mm_segment_t addr_limit; /* thread address space:
|
|
0-0xBFFFFFFF for user
|
|
0-0xFFFFFFFF for kernel */
|
|
struct restart_block restart_block;
|
|
struct thread_info *real_thread; /* Points to non-IRQ stack */
|
|
};
|
|
|
|
#define INIT_THREAD_INFO(tsk) \
|
|
{ \
|
|
.task = &tsk, \
|
|
.exec_domain = &default_exec_domain, \
|
|
.flags = 0, \
|
|
.cpu = 0, \
|
|
.preempt_count = INIT_PREEMPT_COUNT, \
|
|
.addr_limit = KERNEL_DS, \
|
|
.restart_block = { \
|
|
.fn = do_no_restart_syscall, \
|
|
}, \
|
|
.real_thread = NULL, \
|
|
}
|
|
|
|
#define init_thread_info (init_thread_union.thread_info)
|
|
#define init_stack (init_thread_union.stack)
|
|
|
|
#define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
|
|
/* how to get the thread information struct from C */
|
|
static inline struct thread_info *current_thread_info(void)
|
|
{
|
|
struct thread_info *ti;
|
|
unsigned long mask = THREAD_SIZE - 1;
|
|
void *p;
|
|
|
|
asm volatile ("" : "=r" (p) : "0" (&ti));
|
|
ti = (struct thread_info *) (((unsigned long)p) & ~mask);
|
|
return ti;
|
|
}
|
|
|
|
#define THREAD_SIZE_ORDER CONFIG_KERNEL_STACK_ORDER
|
|
|
|
#endif
|
|
|
|
#define PREEMPT_ACTIVE 0x10000000
|
|
|
|
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
|
|
#define TIF_SIGPENDING 1 /* signal pending */
|
|
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
|
|
#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
|
|
* TIF_NEED_RESCHED */
|
|
#define TIF_RESTART_BLOCK 4
|
|
#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
|
|
#define TIF_SYSCALL_AUDIT 6
|
|
#define TIF_RESTORE_SIGMASK 7
|
|
#define TIF_FREEZE 16 /* is freezing for suspend */
|
|
|
|
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
|
|
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
|
|
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
|
|
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
|
|
#define _TIF_MEMDIE (1 << TIF_MEMDIE)
|
|
#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
|
|
#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
|
|
#define _TIF_FREEZE (1 << TIF_FREEZE)
|
|
|
|
#endif
|