forked from Minki/linux
289 lines
8.8 KiB
C
289 lines
8.8 KiB
C
/* thread_info.h: low-level thread information
|
|
*
|
|
* Copyright (C) 2002 David Howells (dhowells@redhat.com)
|
|
* - Incorporating suggestions made by Linus Torvalds and Dave Miller
|
|
*/
|
|
|
|
#ifndef _ASM_X86_THREAD_INFO_H
|
|
#define _ASM_X86_THREAD_INFO_H
|
|
|
|
#include <linux/compiler.h>
|
|
#include <asm/page.h>
|
|
#include <asm/types.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
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
struct task_struct;
|
|
struct exec_domain;
|
|
#include <asm/processor.h>
|
|
#include <asm/ftrace.h>
|
|
#include <linux/atomic.h>
|
|
|
|
struct thread_info {
|
|
struct task_struct *task; /* main task structure */
|
|
struct exec_domain *exec_domain; /* execution domain */
|
|
__u32 flags; /* low level flags */
|
|
__u32 status; /* thread synchronous flags */
|
|
__u32 cpu; /* current CPU */
|
|
int preempt_count; /* 0 => preemptable,
|
|
<0 => BUG */
|
|
mm_segment_t addr_limit;
|
|
struct restart_block restart_block;
|
|
void __user *sysenter_return;
|
|
#ifdef CONFIG_X86_32
|
|
unsigned long previous_esp; /* ESP of the previous stack in
|
|
case of nested (IRQ) stacks
|
|
*/
|
|
__u8 supervisor_stack[0];
|
|
#endif
|
|
unsigned int sig_on_uaccess_error:1;
|
|
unsigned int uaccess_err:1; /* uaccess failed */
|
|
};
|
|
|
|
#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)
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
#include <asm/asm-offsets.h>
|
|
|
|
#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
|
|
* Warning: layout of LSW is hardcoded in entry.S
|
|
*/
|
|
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
|
|
#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
|
|
#define TIF_SIGPENDING 2 /* signal pending */
|
|
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
|
|
#define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/
|
|
#define TIF_IRET 5 /* force IRET */
|
|
#define TIF_SYSCALL_EMU 6 /* syscall emulation active */
|
|
#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
|
|
#define TIF_SECCOMP 8 /* secure computing */
|
|
#define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
|
|
#define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */
|
|
#define TIF_UPROBE 12 /* breakpointed or singlestepping */
|
|
#define TIF_NOTSC 16 /* TSC is not accessible in userland */
|
|
#define TIF_IA32 17 /* IA32 compatibility process */
|
|
#define TIF_FORK 18 /* ret_from_fork */
|
|
#define TIF_MEMDIE 20 /* is terminating due to OOM killer */
|
|
#define TIF_DEBUG 21 /* uses debug registers */
|
|
#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
|
|
#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */
|
|
#define TIF_BLOCKSTEP 25 /* set when we want DEBUGCTLMSR_BTF */
|
|
#define TIF_LAZY_MMU_UPDATES 27 /* task is updating the mmu lazily */
|
|
#define TIF_SYSCALL_TRACEPOINT 28 /* syscall tracepoint instrumentation */
|
|
#define TIF_ADDR32 29 /* 32-bit address space on 64 bits */
|
|
#define TIF_X32 30 /* 32-bit native x86-64 binary */
|
|
|
|
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
|
|
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
|
|
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
|
|
#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
|
|
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
|
|
#define _TIF_IRET (1 << TIF_IRET)
|
|
#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
|
|
#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
|
|
#define _TIF_SECCOMP (1 << TIF_SECCOMP)
|
|
#define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY)
|
|
#define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY)
|
|
#define _TIF_UPROBE (1 << TIF_UPROBE)
|
|
#define _TIF_NOTSC (1 << TIF_NOTSC)
|
|
#define _TIF_IA32 (1 << TIF_IA32)
|
|
#define _TIF_FORK (1 << TIF_FORK)
|
|
#define _TIF_DEBUG (1 << TIF_DEBUG)
|
|
#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
|
|
#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
|
|
#define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP)
|
|
#define _TIF_LAZY_MMU_UPDATES (1 << TIF_LAZY_MMU_UPDATES)
|
|
#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
|
|
#define _TIF_ADDR32 (1 << TIF_ADDR32)
|
|
#define _TIF_X32 (1 << TIF_X32)
|
|
|
|
/* work to do in syscall_trace_enter() */
|
|
#define _TIF_WORK_SYSCALL_ENTRY \
|
|
(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT | \
|
|
_TIF_SECCOMP | _TIF_SINGLESTEP | _TIF_SYSCALL_TRACEPOINT)
|
|
|
|
/* work to do in syscall_trace_leave() */
|
|
#define _TIF_WORK_SYSCALL_EXIT \
|
|
(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP | \
|
|
_TIF_SYSCALL_TRACEPOINT)
|
|
|
|
/* work to do on interrupt/exception return */
|
|
#define _TIF_WORK_MASK \
|
|
(0x0000FFFF & \
|
|
~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT| \
|
|
_TIF_SINGLESTEP|_TIF_SECCOMP|_TIF_SYSCALL_EMU))
|
|
|
|
/* work to do on any return to user space */
|
|
#define _TIF_ALLWORK_MASK \
|
|
((0x0000FFFF & ~_TIF_SECCOMP) | _TIF_SYSCALL_TRACEPOINT)
|
|
|
|
/* Only used for 64 bit */
|
|
#define _TIF_DO_NOTIFY_MASK \
|
|
(_TIF_SIGPENDING | _TIF_MCE_NOTIFY | _TIF_NOTIFY_RESUME | \
|
|
_TIF_USER_RETURN_NOTIFY)
|
|
|
|
/* flags to check in __switch_to() */
|
|
#define _TIF_WORK_CTXSW \
|
|
(_TIF_IO_BITMAP|_TIF_NOTSC|_TIF_BLOCKSTEP)
|
|
|
|
#define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
|
|
#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)
|
|
|
|
#define PREEMPT_ACTIVE 0x10000000
|
|
|
|
#ifdef CONFIG_X86_32
|
|
|
|
#define STACK_WARN (THREAD_SIZE/8)
|
|
/*
|
|
* macros/functions for gaining access to the thread information structure
|
|
*
|
|
* preempt_count needs to be 1 initially, until the scheduler is functional.
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
|
|
|
|
/* how to get the current stack pointer from C */
|
|
register unsigned long current_stack_pointer asm("esp") __used;
|
|
|
|
/* how to get the thread information struct from C */
|
|
static inline struct thread_info *current_thread_info(void)
|
|
{
|
|
return (struct thread_info *)
|
|
(current_stack_pointer & ~(THREAD_SIZE - 1));
|
|
}
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
/* how to get the thread information struct from ASM */
|
|
#define GET_THREAD_INFO(reg) \
|
|
movl $-THREAD_SIZE, reg; \
|
|
andl %esp, reg
|
|
|
|
/* use this one if reg already contains %esp */
|
|
#define GET_THREAD_INFO_WITH_ESP(reg) \
|
|
andl $-THREAD_SIZE, reg
|
|
|
|
#endif
|
|
|
|
#else /* X86_32 */
|
|
|
|
#include <asm/percpu.h>
|
|
#define KERNEL_STACK_OFFSET (5*8)
|
|
|
|
/*
|
|
* macros/functions for gaining access to the thread information structure
|
|
* preempt_count needs to be 1 initially, until the scheduler is functional.
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
DECLARE_PER_CPU(unsigned long, kernel_stack);
|
|
|
|
static inline struct thread_info *current_thread_info(void)
|
|
{
|
|
struct thread_info *ti;
|
|
ti = (void *)(this_cpu_read_stable(kernel_stack) +
|
|
KERNEL_STACK_OFFSET - THREAD_SIZE);
|
|
return ti;
|
|
}
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
/* how to get the thread information struct from ASM */
|
|
#define GET_THREAD_INFO(reg) \
|
|
movq PER_CPU_VAR(kernel_stack),reg ; \
|
|
subq $(THREAD_SIZE-KERNEL_STACK_OFFSET),reg
|
|
|
|
/*
|
|
* Same if PER_CPU_VAR(kernel_stack) is, perhaps with some offset, already in
|
|
* a certain register (to be used in assembler memory operands).
|
|
*/
|
|
#define THREAD_INFO(reg, off) KERNEL_STACK_OFFSET+(off)-THREAD_SIZE(reg)
|
|
|
|
#endif
|
|
|
|
#endif /* !X86_32 */
|
|
|
|
/*
|
|
* Thread-synchronous status.
|
|
*
|
|
* This is different from the flags in that nobody else
|
|
* ever touches our thread-synchronous status, so we don't
|
|
* have to worry about atomic accesses.
|
|
*/
|
|
#define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/
|
|
#define TS_POLLING 0x0004 /* idle task polling need_resched,
|
|
skip sending interrupt */
|
|
#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */
|
|
|
|
#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#define HAVE_SET_RESTORE_SIGMASK 1
|
|
static inline void set_restore_sigmask(void)
|
|
{
|
|
struct thread_info *ti = current_thread_info();
|
|
ti->status |= TS_RESTORE_SIGMASK;
|
|
WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
|
|
}
|
|
static inline void clear_restore_sigmask(void)
|
|
{
|
|
current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
|
|
}
|
|
static inline bool test_restore_sigmask(void)
|
|
{
|
|
return current_thread_info()->status & TS_RESTORE_SIGMASK;
|
|
}
|
|
static inline bool test_and_clear_restore_sigmask(void)
|
|
{
|
|
struct thread_info *ti = current_thread_info();
|
|
if (!(ti->status & TS_RESTORE_SIGMASK))
|
|
return false;
|
|
ti->status &= ~TS_RESTORE_SIGMASK;
|
|
return true;
|
|
}
|
|
|
|
static inline bool is_ia32_task(void)
|
|
{
|
|
#ifdef CONFIG_X86_32
|
|
return true;
|
|
#endif
|
|
#ifdef CONFIG_IA32_EMULATION
|
|
if (current_thread_info()->status & TS_COMPAT)
|
|
return true;
|
|
#endif
|
|
return false;
|
|
}
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#ifndef __ASSEMBLY__
|
|
extern void arch_task_cache_init(void);
|
|
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
|
|
extern void arch_release_task_struct(struct task_struct *tsk);
|
|
#endif
|
|
#endif /* _ASM_X86_THREAD_INFO_H */
|