forked from Minki/linux
2991be7252
Drop TIF_USERSPACE and add addr_limit to the thread_info struct. Subsequently, use that for address checking in strnlen_user() to ward off bogus -EFAULTs. Make __strnlen_user() return 0 on exception, rather than -EFAULT. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
#ifndef __ASM_SH_THREAD_INFO_H
|
|
#define __ASM_SH_THREAD_INFO_H
|
|
|
|
/* SuperH version
|
|
* Copyright (C) 2002 Niibe Yutaka
|
|
*
|
|
* The copyright of original i386 version is:
|
|
*
|
|
* Copyright (C) 2002 David Howells (dhowells@redhat.com)
|
|
* - Incorporating suggestions made by Linus Torvalds and Dave Miller
|
|
*/
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <asm/processor.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;
|
|
int preempt_count; /* 0 => preemptable, <0 => BUG */
|
|
mm_segment_t addr_limit; /* thread address space */
|
|
struct restart_block restart_block;
|
|
__u8 supervisor_stack[0];
|
|
};
|
|
|
|
#endif
|
|
|
|
#define PREEMPT_ACTIVE 0x10000000
|
|
|
|
/*
|
|
* macros/functions for gaining access to the thread information structure
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
#define INIT_THREAD_INFO(tsk) \
|
|
{ \
|
|
.task = &tsk, \
|
|
.exec_domain = &default_exec_domain, \
|
|
.flags = 0, \
|
|
.cpu = 0, \
|
|
.preempt_count = 1, \
|
|
.addr_limit = KERNEL_DS, \
|
|
.restart_block = { \
|
|
.fn = do_no_restart_syscall, \
|
|
}, \
|
|
}
|
|
|
|
#define init_thread_info (init_thread_union.thread_info)
|
|
#define init_stack (init_thread_union.stack)
|
|
|
|
#define THREAD_SIZE (2*PAGE_SIZE)
|
|
|
|
/* how to get the thread information struct from C */
|
|
static inline struct thread_info *current_thread_info(void)
|
|
{
|
|
struct thread_info *ti;
|
|
#ifdef CONFIG_CPU_HAS_SR_RB
|
|
__asm__("stc r7_bank, %0" : "=r" (ti));
|
|
#else
|
|
unsigned long __dummy;
|
|
|
|
__asm__ __volatile__ (
|
|
"mov r15, %0\n\t"
|
|
"and %1, %0\n\t"
|
|
: "=&r" (ti), "=r" (__dummy)
|
|
: "1" (~(THREAD_SIZE - 1))
|
|
: "memory");
|
|
#endif
|
|
|
|
return ti;
|
|
}
|
|
|
|
/* thread information allocation */
|
|
#define alloc_thread_info(ti) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
|
|
#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
/* how to get the thread information struct from ASM */
|
|
#define GET_THREAD_INFO(reg) \
|
|
stc r7_bank, reg
|
|
|
|
#endif
|
|
|
|
/*
|
|
* thread information flags
|
|
* - these are process state flags that various assembly files may need to access
|
|
* - pending work-to-be-done flags are in LSW
|
|
* - other flags in MSW
|
|
*/
|
|
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
|
|
#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
|
|
#define TIF_SIGPENDING 2 /* signal pending */
|
|
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
|
|
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
|
|
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
|
|
#define TIF_MEMDIE 18
|
|
|
|
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
|
|
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
|
|
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
|
|
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
|
|
#define _TIF_USEDFPU (1<<TIF_USEDFPU)
|
|
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
|
|
|
|
#define _TIF_WORK_MASK 0x000000FE /* work to do on interrupt/exception return */
|
|
#define _TIF_ALLWORK_MASK 0x000000FF /* work to do on any return to u-space */
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __ASM_SH_THREAD_INFO_H */
|