179 lines
4.9 KiB
C
179 lines
4.9 KiB
C
/* MN10300 Low-level thread information
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _ASM_THREAD_INFO_H
|
|
#define _ASM_THREAD_INFO_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/page.h>
|
|
|
|
#define PREEMPT_ACTIVE 0x10000000
|
|
|
|
#ifdef CONFIG_4KSTACKS
|
|
#define THREAD_SIZE (4096)
|
|
#else
|
|
#define THREAD_SIZE (8192)
|
|
#endif
|
|
|
|
#define STACK_WARN (THREAD_SIZE / 8)
|
|
|
|
/*
|
|
* low level task data that entry.S needs immediate access to
|
|
* - this struct should fit entirely inside of one cache line
|
|
* - this struct shares the supervisor stack pages
|
|
* - if the contents of this structure are changed, the assembly constants
|
|
* 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 */
|
|
|
|
mm_segment_t addr_limit; /* thread address space:
|
|
0-0xBFFFFFFF for user-thead
|
|
0-0xFFFFFFFF for kernel-thread
|
|
*/
|
|
struct restart_block restart_block;
|
|
|
|
__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__
|
|
#include <asm/asm-offsets.h>
|
|
#endif
|
|
|
|
#endif
|
|
|
|
/*
|
|
* 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 = INIT_PREEMPT_COUNT, \
|
|
.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 init_uregs \
|
|
((struct pt_regs *) \
|
|
((unsigned long) init_stack + THREAD_SIZE - sizeof(struct pt_regs)))
|
|
|
|
extern struct thread_info *__current_ti;
|
|
|
|
/* how to get the thread information struct from C */
|
|
static inline __attribute__((const))
|
|
struct thread_info *current_thread_info(void)
|
|
{
|
|
struct thread_info *ti;
|
|
asm("mov sp,%0\n"
|
|
"and %1,%0\n"
|
|
: "=d" (ti)
|
|
: "i" (~(THREAD_SIZE - 1))
|
|
: "cc");
|
|
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)
|
|
{
|
|
unsigned long sp;
|
|
asm("mov sp,%0; ":"=r" (sp));
|
|
return sp;
|
|
}
|
|
|
|
#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
|
|
|
|
/* thread information allocation */
|
|
#ifdef CONFIG_DEBUG_STACK_USAGE
|
|
#define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL)
|
|
#else
|
|
#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
|
|
#endif
|
|
|
|
#define free_thread_info(ti) kfree((ti))
|
|
#define get_thread_info(ti) get_task_struct((ti)->task)
|
|
#define put_thread_info(ti) put_task_struct((ti)->task)
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
#ifndef __VMLINUX_LDS__
|
|
/* how to get the thread information struct from ASM */
|
|
.macro GET_THREAD_INFO reg
|
|
mov sp,\reg
|
|
and -THREAD_SIZE,\reg
|
|
.endm
|
|
#endif
|
|
#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_SINGLESTEP 4 /* restore singlestep on return to user mode */
|
|
#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
|
|
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
|
|
#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
|
|
#define TIF_FREEZE 18 /* freezing for suspend */
|
|
|
|
#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_SINGLESTEP +(1 << TIF_SINGLESTEP)
|
|
#define _TIF_RESTORE_SIGMASK +(1 << TIF_RESTORE_SIGMASK)
|
|
#define _TIF_POLLING_NRFLAG +(1 << TIF_POLLING_NRFLAG)
|
|
#define _TIF_FREEZE +(1 << TIF_FREEZE)
|
|
|
|
#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
|
|
#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_THREAD_INFO_H */
|