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/*
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* arch / arm / include / asm / thread_info . h
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*
* Copyright ( C ) 2002 Russell King .
*
* 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 .
*/
# ifndef __ASM_ARM_THREAD_INFO_H
# define __ASM_ARM_THREAD_INFO_H
# ifdef __KERNEL__
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# include <linux/compiler.h>
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# include <asm/fpstate.h>
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# define THREAD_SIZE_ORDER 1
# define THREAD_SIZE 8192
# define THREAD_START_SP (THREAD_SIZE - 8)
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# ifndef __ASSEMBLY__
struct task_struct ;
struct exec_domain ;
# include <asm/types.h>
# include <asm/domain.h>
typedef unsigned long mm_segment_t ;
struct cpu_context_save {
__u32 r4 ;
__u32 r5 ;
__u32 r6 ;
__u32 r7 ;
__u32 r8 ;
__u32 r9 ;
__u32 sl ;
__u32 fp ;
__u32 sp ;
__u32 pc ;
__u32 extra [ 2 ] ; /* Xscale 'acc' register, etc */
} ;
/*
* low level task data that entry . S needs immediate access to .
* __switch_to ( ) assumes cpu_context follows immediately after cpu_domain .
*/
struct thread_info {
unsigned long flags ; /* low level flags */
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int preempt_count ; /* 0 => preemptable, <0 => bug */
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mm_segment_t addr_limit ; /* address limit */
struct task_struct * task ; /* main task structure */
struct exec_domain * exec_domain ; /* execution domain */
__u32 cpu ; /* cpu */
__u32 cpu_domain ; /* cpu domain */
struct cpu_context_save cpu_context ; /* cpu context */
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__u32 syscall ; /* syscall number */
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__u8 used_cp [ 16 ] ; /* thread used copro */
unsigned long tp_value ;
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struct crunch_state crunchstate ;
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union fp_state fpstate __attribute__ ( ( aligned ( 8 ) ) ) ;
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union vfp_state vfpstate ;
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# ifdef CONFIG_ARM_THUMBEE
unsigned long thumbee_state ; /* ThumbEE Handler Base register */
# endif
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struct restart_block restart_block ;
} ;
# define INIT_THREAD_INFO(tsk) \
{ \
. task = & tsk , \
. exec_domain = & default_exec_domain , \
. flags = 0 , \
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. preempt_count = INIT_PREEMPT_COUNT , \
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. addr_limit = KERNEL_DS , \
. cpu_domain = domain_val ( DOMAIN_USER , DOMAIN_MANAGER ) | \
domain_val ( DOMAIN_KERNEL , DOMAIN_MANAGER ) | \
domain_val ( DOMAIN_IO , DOMAIN_CLIENT ) , \
. restart_block = { \
. fn = do_no_restart_syscall , \
} , \
}
# define init_thread_info (init_thread_union.thread_info)
# define init_stack (init_thread_union.stack)
/*
* how to get the thread information struct from C
*/
static inline struct thread_info * current_thread_info ( void ) __attribute_const__ ;
static inline struct thread_info * current_thread_info ( void )
{
register unsigned long sp asm ( " sp " ) ;
return ( struct thread_info * ) ( sp & ~ ( THREAD_SIZE - 1 ) ) ;
}
# define thread_saved_pc(tsk) \
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( ( unsigned long ) ( task_thread_info ( tsk ) - > cpu_context . pc ) )
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# define thread_saved_sp(tsk) \
( ( unsigned long ) ( task_thread_info ( tsk ) - > cpu_context . sp ) )
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# define thread_saved_fp(tsk) \
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( ( unsigned long ) ( task_thread_info ( tsk ) - > cpu_context . fp ) )
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extern void crunch_task_disable ( struct thread_info * ) ;
extern void crunch_task_copy ( struct thread_info * , void * ) ;
extern void crunch_task_restore ( struct thread_info * , void * ) ;
extern void crunch_task_release ( struct thread_info * ) ;
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extern void iwmmxt_task_disable ( struct thread_info * ) ;
extern void iwmmxt_task_copy ( struct thread_info * , void * ) ;
extern void iwmmxt_task_restore ( struct thread_info * , void * ) ;
extern void iwmmxt_task_release ( struct thread_info * ) ;
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extern void iwmmxt_task_switch ( struct thread_info * ) ;
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extern void vfp_sync_hwstate ( struct thread_info * ) ;
extern void vfp_flush_hwstate ( struct thread_info * ) ;
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# endif
/*
* We use bit 30 of the preempt_count to indicate that kernel
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* preemption is occurring . See < asm / hardirq . h > .
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*/
# define PREEMPT_ACTIVE 0x40000000
/*
* thread information flags :
* TIF_SYSCALL_TRACE - syscall trace active
* TIF_SIGPENDING - signal pending
* TIF_NEED_RESCHED - rescheduling necessary
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* TIF_NOTIFY_RESUME - callback before returning to user
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* TIF_USEDFPU - FPU was used by this task this quantum ( SMP )
* TIF_POLLING_NRFLAG - true if poll_idle ( ) is polling TIF_NEED_RESCHED
*/
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# define TIF_SIGPENDING 0
# define TIF_NEED_RESCHED 1
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# define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
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# define TIF_SYSCALL_TRACE 8
# define TIF_POLLING_NRFLAG 16
# define TIF_USING_IWMMXT 17
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# define TIF_MEMDIE 18 /* is terminating due to OOM killer */
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# define TIF_FREEZE 19
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>
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# define TIF_RESTORE_SIGMASK 20
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# define TIF_SECCOMP 21
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# define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
# define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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# define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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# define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
# define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
# define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
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# define _TIF_FREEZE (1 << TIF_FREEZE)
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 15:58:11 +04:00
# define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
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# define _TIF_SECCOMP (1 << TIF_SECCOMP)
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/*
* Change these and you break ASM code in entry - common . S
*/
# define _TIF_WORK_MASK 0x000000ff
# endif /* __KERNEL__ */
# endif /* __ASM_ARM_THREAD_INFO_H */
