2005-04-16 22:20:36 +00:00
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/*
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2008-08-02 09:55:55 +00:00
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* arch/arm/include/asm/thread_info.h
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2005-04-16 22:20:36 +00:00
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*
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* Copyright (C) 2002 Russell King.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_THREAD_INFO_H
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#define __ASM_ARM_THREAD_INFO_H
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#ifdef __KERNEL__
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2005-11-16 17:23:57 +00:00
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#include <linux/compiler.h>
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2005-04-16 22:20:36 +00:00
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#include <asm/fpstate.h>
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2005-05-05 12:11:00 +00:00
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE 8192
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#define THREAD_START_SP (THREAD_SIZE - 8)
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2005-04-16 22:20:36 +00:00
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#ifndef __ASSEMBLY__
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struct task_struct;
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struct exec_domain;
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#include <asm/types.h>
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#include <asm/domain.h>
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typedef unsigned long mm_segment_t;
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struct cpu_context_save {
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__u32 r4;
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__u32 r5;
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__u32 r6;
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__u32 r7;
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__u32 r8;
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__u32 r9;
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__u32 sl;
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__u32 fp;
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__u32 sp;
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__u32 pc;
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__u32 extra[2]; /* Xscale 'acc' register, etc */
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};
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/*
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* low level task data that entry.S needs immediate access to.
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* __switch_to() assumes cpu_context follows immediately after cpu_domain.
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*/
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struct thread_info {
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unsigned long flags; /* low level flags */
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2005-06-23 07:09:07 +00:00
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int preempt_count; /* 0 => preemptable, <0 => bug */
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2005-04-16 22:20:36 +00:00
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mm_segment_t addr_limit; /* address limit */
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struct task_struct *task; /* main task structure */
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struct exec_domain *exec_domain; /* execution domain */
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__u32 cpu; /* cpu */
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__u32 cpu_domain; /* cpu domain */
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struct cpu_context_save cpu_context; /* cpu context */
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2007-05-06 12:56:26 +00:00
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__u32 syscall; /* syscall number */
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2005-04-16 22:20:36 +00:00
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__u8 used_cp[16]; /* thread used copro */
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unsigned long tp_value;
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2006-06-27 22:03:03 +00:00
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struct crunch_state crunchstate;
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2006-03-12 22:36:06 +00:00
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union fp_state fpstate __attribute__((aligned(8)));
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2005-04-16 22:20:36 +00:00
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union vfp_state vfpstate;
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2008-04-18 21:43:06 +00:00
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#ifdef CONFIG_ARM_THUMBEE
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unsigned long thumbee_state; /* ThumbEE Handler Base register */
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#endif
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2005-04-16 22:20:36 +00:00
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struct restart_block restart_block;
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};
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.exec_domain = &default_exec_domain, \
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.flags = 0, \
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2009-07-10 12:57:56 +00:00
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.preempt_count = INIT_PREEMPT_COUNT, \
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2005-04-16 22:20:36 +00:00
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.addr_limit = KERNEL_DS, \
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.cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
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domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
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domain_val(DOMAIN_IO, DOMAIN_CLIENT), \
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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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}
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#define init_thread_info (init_thread_union.thread_info)
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#define init_stack (init_thread_union.stack)
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/*
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* how to get the thread information struct from C
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*/
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static inline struct thread_info *current_thread_info(void) __attribute_const__;
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static inline struct thread_info *current_thread_info(void)
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{
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register unsigned long sp asm ("sp");
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return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
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}
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#define thread_saved_pc(tsk) \
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2008-09-06 09:14:24 +00:00
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((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
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2009-02-11 12:07:53 +00:00
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#define thread_saved_sp(tsk) \
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((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
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2005-04-16 22:20:36 +00:00
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#define thread_saved_fp(tsk) \
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2006-01-12 09:05:56 +00:00
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((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
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2005-04-16 22:20:36 +00:00
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2006-06-27 22:03:03 +00:00
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extern void crunch_task_disable(struct thread_info *);
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extern void crunch_task_copy(struct thread_info *, void *);
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extern void crunch_task_restore(struct thread_info *, void *);
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extern void crunch_task_release(struct thread_info *);
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2005-04-16 22:20:36 +00:00
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extern void iwmmxt_task_disable(struct thread_info *);
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extern void iwmmxt_task_copy(struct thread_info *, void *);
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extern void iwmmxt_task_restore(struct thread_info *, void *);
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extern void iwmmxt_task_release(struct thread_info *);
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2006-07-01 18:56:48 +00:00
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extern void iwmmxt_task_switch(struct thread_info *);
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2005-04-16 22:20:36 +00:00
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2010-02-06 11:36:23 +00:00
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extern void vfp_sync_hwstate(struct thread_info *);
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extern void vfp_flush_hwstate(struct thread_info *);
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2009-02-11 12:12:56 +00:00
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2005-04-16 22:20:36 +00:00
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#endif
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/*
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* We use bit 30 of the preempt_count to indicate that kernel
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2008-08-02 09:55:55 +00:00
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* preemption is occurring. See <asm/hardirq.h>.
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2005-04-16 22:20:36 +00:00
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*/
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#define PREEMPT_ACTIVE 0x40000000
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/*
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* thread information flags:
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* TIF_SYSCALL_TRACE - syscall trace active
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* TIF_SIGPENDING - signal pending
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* TIF_NEED_RESCHED - rescheduling necessary
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2009-09-02 08:14:16 +00:00
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* TIF_NOTIFY_RESUME - callback before returning to user
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2005-04-16 22:20:36 +00:00
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* TIF_USEDFPU - FPU was used by this task this quantum (SMP)
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* TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
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*/
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2007-07-31 07:38:00 +00:00
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#define TIF_SIGPENDING 0
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#define TIF_NEED_RESCHED 1
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2009-09-02 08:14:16 +00:00
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#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
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2005-04-16 22:20:36 +00:00
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#define TIF_SYSCALL_TRACE 8
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#define TIF_POLLING_NRFLAG 16
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#define TIF_USING_IWMMXT 17
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2010-05-14 09:13:27 +00:00
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#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
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2006-12-13 08:34:30 +00:00
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#define TIF_FREEZE 19
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ARM: 5677/1: ARM support for TIF_RESTORE_SIGMASK/pselect6/ppoll/epoll_pwait
This patch adds support for TIF_RESTORE_SIGMASK to ARM's
signal handling, which allows to hook up the pselect6, ppoll,
and epoll_pwait syscalls on ARM.
Tested here with eabi userspace and a test program with a
deliberate race between a child's exit and the parent's
sigprocmask/select sequence. Using sys_pselect6() instead
of sigprocmask/select reliably prevents the race.
The other arch's support for TIF_RESTORE_SIGMASK has evolved
over time:
In 2.6.16:
- add TIF_RESTORE_SIGMASK which parallels TIF_SIGPENDING
- test both when checking for pending signal [changed later]
- reimplement sys_sigsuspend() to use current->saved_sigmask,
TIF_RESTORE_SIGMASK [changed later], and -ERESTARTNOHAND;
ditto for sys_rt_sigsuspend(), but drop private code and
use common code via __ARCH_WANT_SYS_RT_SIGSUSPEND;
- there are now no "extra" calls to do_signal() so its oldset
parameter is always ¤t->blocked so need not be passed,
also its return value is changed to void
- change handle_signal() to return 0/-errno
- change do_signal() to honor TIF_RESTORE_SIGMASK:
+ get oldset from current->saved_sigmask if TIF_RESTORE_SIGMASK
is set
+ if handle_signal() was successful then clear TIF_RESTORE_SIGMASK
+ if no signal was delivered and TIF_RESTORE_SIGMASK is set then
clear it and restore the sigmask
- hook up sys_pselect6() and sys_ppoll()
In 2.6.19:
- hook up sys_epoll_pwait()
In 2.6.26:
- allow archs to override how TIF_RESTORE_SIGMASK is implemented;
default set_restore_sigmask() sets both TIF_RESTORE_SIGMASK and
TIF_SIGPENDING; archs need now just test TIF_SIGPENDING again
when checking for pending signal work; some archs now implement
TIF_RESTORE_SIGMASK as a secondary/non-atomic thread flag bit
- call set_restore_sigmask() in sys_sigsuspend() instead of setting
TIF_RESTORE_SIGMASK
In 2.6.29-rc:
- kill sys_pselect7() which no arch wanted
So for 2.6.31-rc6/ARM this patch does the following:
- Add TIF_RESTORE_SIGMASK. Use the generic set_restore_sigmask()
which sets both TIF_SIGPENDING and TIF_RESTORE_SIGMASK, so
TIF_RESTORE_SIGMASK need not claim one of the scarce low thread
flags, and existing TIF_SIGPENDING and _TIF_WORK_MASK tests need
not be extended for TIF_RESTORE_SIGMASK.
- sys_sigsuspend() is reimplemented to use current->saved_sigmask
and set_restore_sigmask(), making it identical to most other archs
- The private code for sys_rt_sigsuspend() is removed, instead
generic code supplies it via __ARCH_WANT_SYS_RT_SIGSUSPEND.
- sys_sigsuspend() and sys_rt_sigsuspend() no longer need a pt_regs
parameter, so their assembly code wrappers are removed.
- handle_signal() is changed to return 0 on success or -errno.
- The oldset parameter to do_signal() is now redundant and removed,
and the return value is now also redundant and changed to void.
- do_signal() is changed to honor TIF_RESTORE_SIGMASK:
+ get oldset from current->saved_sigmask if TIF_RESTORE_SIGMASK
is set
+ if handle_signal() was successful then clear TIF_RESTORE_SIGMASK
+ if no signal was delivered and TIF_RESTORE_SIGMASK is set then
clear it and restore the sigmask
- Hook up sys_pselect6, sys_ppoll, and sys_epoll_pwait.
Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-08-15 11:58:11 +00:00
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#define TIF_RESTORE_SIGMASK 20
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2010-08-26 22:08:35 +00:00
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#define TIF_SECCOMP 21
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2005-04-16 22:20:36 +00:00
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#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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2009-09-02 08:14:16 +00:00
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#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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2005-04-16 22:20:36 +00:00
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#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
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#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
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#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
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2006-12-13 08:34:30 +00:00
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#define _TIF_FREEZE (1 << TIF_FREEZE)
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ARM: 5677/1: ARM support for TIF_RESTORE_SIGMASK/pselect6/ppoll/epoll_pwait
This patch adds support for TIF_RESTORE_SIGMASK to ARM's
signal handling, which allows to hook up the pselect6, ppoll,
and epoll_pwait syscalls on ARM.
Tested here with eabi userspace and a test program with a
deliberate race between a child's exit and the parent's
sigprocmask/select sequence. Using sys_pselect6() instead
of sigprocmask/select reliably prevents the race.
The other arch's support for TIF_RESTORE_SIGMASK has evolved
over time:
In 2.6.16:
- add TIF_RESTORE_SIGMASK which parallels TIF_SIGPENDING
- test both when checking for pending signal [changed later]
- reimplement sys_sigsuspend() to use current->saved_sigmask,
TIF_RESTORE_SIGMASK [changed later], and -ERESTARTNOHAND;
ditto for sys_rt_sigsuspend(), but drop private code and
use common code via __ARCH_WANT_SYS_RT_SIGSUSPEND;
- there are now no "extra" calls to do_signal() so its oldset
parameter is always ¤t->blocked so need not be passed,
also its return value is changed to void
- change handle_signal() to return 0/-errno
- change do_signal() to honor TIF_RESTORE_SIGMASK:
+ get oldset from current->saved_sigmask if TIF_RESTORE_SIGMASK
is set
+ if handle_signal() was successful then clear TIF_RESTORE_SIGMASK
+ if no signal was delivered and TIF_RESTORE_SIGMASK is set then
clear it and restore the sigmask
- hook up sys_pselect6() and sys_ppoll()
In 2.6.19:
- hook up sys_epoll_pwait()
In 2.6.26:
- allow archs to override how TIF_RESTORE_SIGMASK is implemented;
default set_restore_sigmask() sets both TIF_RESTORE_SIGMASK and
TIF_SIGPENDING; archs need now just test TIF_SIGPENDING again
when checking for pending signal work; some archs now implement
TIF_RESTORE_SIGMASK as a secondary/non-atomic thread flag bit
- call set_restore_sigmask() in sys_sigsuspend() instead of setting
TIF_RESTORE_SIGMASK
In 2.6.29-rc:
- kill sys_pselect7() which no arch wanted
So for 2.6.31-rc6/ARM this patch does the following:
- Add TIF_RESTORE_SIGMASK. Use the generic set_restore_sigmask()
which sets both TIF_SIGPENDING and TIF_RESTORE_SIGMASK, so
TIF_RESTORE_SIGMASK need not claim one of the scarce low thread
flags, and existing TIF_SIGPENDING and _TIF_WORK_MASK tests need
not be extended for TIF_RESTORE_SIGMASK.
- sys_sigsuspend() is reimplemented to use current->saved_sigmask
and set_restore_sigmask(), making it identical to most other archs
- The private code for sys_rt_sigsuspend() is removed, instead
generic code supplies it via __ARCH_WANT_SYS_RT_SIGSUSPEND.
- sys_sigsuspend() and sys_rt_sigsuspend() no longer need a pt_regs
parameter, so their assembly code wrappers are removed.
- handle_signal() is changed to return 0 on success or -errno.
- The oldset parameter to do_signal() is now redundant and removed,
and the return value is now also redundant and changed to void.
- do_signal() is changed to honor TIF_RESTORE_SIGMASK:
+ get oldset from current->saved_sigmask if TIF_RESTORE_SIGMASK
is set
+ if handle_signal() was successful then clear TIF_RESTORE_SIGMASK
+ if no signal was delivered and TIF_RESTORE_SIGMASK is set then
clear it and restore the sigmask
- Hook up sys_pselect6, sys_ppoll, and sys_epoll_pwait.
Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-08-15 11:58:11 +00:00
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#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
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2010-08-26 22:08:35 +00:00
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#define _TIF_SECCOMP (1 << TIF_SECCOMP)
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2005-04-16 22:20:36 +00:00
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/*
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* Change these and you break ASM code in entry-common.S
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*/
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#define _TIF_WORK_MASK 0x000000ff
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#endif /* __KERNEL__ */
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#endif /* __ASM_ARM_THREAD_INFO_H */
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