mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 05:11:48 +00:00
3be80aaef8
* L1_CACHE_SHIFT * PAGE_SIZE, PAGE_OFFSET * struct pt_regs, struct user_regs_struct * struct thread_struct, cpu_relax(), task_pt_regs(), start_thread(), ... * struct thread_info, THREAD_SIZE, INIT_THREAD_INFO(), TIF_*, ... * BUG() * ELF_* * Elf_* To disallow user-space visibility into some of the core kernel data-types such as struct pt_regs, #ifdef __KERNEL__ which also makes the UAPI header spit (further patch in the series) to NOT export it to asm/uapi/ptrace.h Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Jonas Bonn <jonas.bonn@gmail.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Acked-by: Arnd Bergmann <arnd@arndb.de>
122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/*
|
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Vineetg: Oct 2009
|
|
* No need for ARC specific thread_info allocator (kmalloc/free). This is
|
|
* anyways one page allocation, thus slab alloc can be short-circuited and
|
|
* the generic version (get_free_page) would be loads better.
|
|
*
|
|
* Sameer Dhavale: Codito Technologies 2004
|
|
*/
|
|
|
|
#ifndef _ASM_THREAD_INFO_H
|
|
#define _ASM_THREAD_INFO_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/page.h>
|
|
|
|
#ifdef CONFIG_16KSTACKS
|
|
#define THREAD_SIZE_ORDER 1
|
|
#else
|
|
#define THREAD_SIZE_ORDER 0
|
|
#endif
|
|
|
|
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/thread_info.h>
|
|
#include <asm/segment.h>
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
struct thread_info {
|
|
unsigned long flags; /* low level flags */
|
|
int preempt_count; /* 0 => preemptable, <0 => BUG */
|
|
struct task_struct *task; /* main task structure */
|
|
mm_segment_t addr_limit; /* thread address space */
|
|
struct exec_domain *exec_domain;/* execution domain */
|
|
__u32 cpu; /* current CPU */
|
|
unsigned long thr_ptr; /* TLS ptr */
|
|
struct restart_block restart_block;
|
|
};
|
|
|
|
/*
|
|
* macros/functions for gaining access to the thread information structure
|
|
*
|
|
* preempt_count needs to be 1 initially, until the scheduler is functional.
|
|
*/
|
|
#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)
|
|
|
|
static inline __attribute_const__ struct thread_info *current_thread_info(void)
|
|
{
|
|
register unsigned long sp asm("sp");
|
|
return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
|
|
}
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#define PREEMPT_ACTIVE 0x10000000
|
|
|
|
/*
|
|
* 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_RESTORE_SIGMASK 0 /* restore sig mask in do_signal() */
|
|
#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
|
|
#define TIF_SIGPENDING 2 /* signal pending */
|
|
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
|
|
#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
|
|
#define TIF_SYSCALL_TRACE 15 /* syscall trace active */
|
|
|
|
/* true if poll_idle() is polling TIF_NEED_RESCHED */
|
|
#define TIF_MEMDIE 16
|
|
|
|
#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_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
|
|
#define _TIF_MEMDIE (1<<TIF_MEMDIE)
|
|
|
|
/* work to do on interrupt/exception return */
|
|
#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
|
|
_TIF_NOTIFY_RESUME)
|
|
|
|
/*
|
|
* _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it.
|
|
* SYSCALL_TRACE is anways seperately/unconditionally tested right after a
|
|
* syscall, so all that reamins to be tested is _TIF_WORK_MASK
|
|
*/
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_THREAD_INFO_H */
|