2008-05-12 07:43:41 -06:00
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/* thread_info.h: low-level thread information
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*
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* Copyright (C) 2002 David Howells (dhowells@redhat.com)
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* - Incorporating suggestions made by Linus Torvalds and Dave Miller
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*/
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2008-10-22 23:26:29 -06:00
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#ifndef _ASM_X86_THREAD_INFO_H
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#define _ASM_X86_THREAD_INFO_H
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2008-05-12 07:43:41 -06:00
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#include <linux/compiler.h>
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#include <asm/page.h>
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2008-04-28 19:52:33 -06:00
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#include <asm/types.h>
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2008-05-12 07:43:41 -06:00
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/*
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* low level task data that entry.S needs immediate access to
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* - this struct should fit entirely inside of one cache line
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* - this struct shares the supervisor stack pages
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*/
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#ifndef __ASSEMBLY__
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2008-04-28 19:52:35 -06:00
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struct task_struct;
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struct exec_domain;
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#include <asm/processor.h>
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2011-07-26 17:09:06 -06:00
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#include <linux/atomic.h>
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2008-05-12 07:43:41 -06:00
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struct thread_info {
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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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2008-12-03 16:58:19 -07:00
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__u32 flags; /* low level flags */
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2008-04-28 19:52:35 -06:00
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__u32 status; /* thread synchronous flags */
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2008-05-12 07:43:41 -06:00
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__u32 cpu; /* current CPU */
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2008-05-17 00:28:33 -06:00
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int preempt_count; /* 0 => preemptable,
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2008-05-12 07:43:41 -06:00
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<0 => BUG */
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2008-04-28 19:52:35 -06:00
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mm_segment_t addr_limit;
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2008-05-12 07:43:41 -06:00
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struct restart_block restart_block;
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2008-04-28 19:52:35 -06:00
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void __user *sysenter_return;
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#ifdef CONFIG_X86_32
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2008-05-12 07:43:41 -06:00
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unsigned long previous_esp; /* ESP of the previous stack in
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case of nested (IRQ) stacks
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*/
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__u8 supervisor_stack[0];
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2008-04-28 19:52:35 -06:00
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#endif
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2012-01-10 18:11:46 -07:00
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unsigned int sig_on_uaccess_error:1;
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unsigned int uaccess_err:1; /* uaccess failed */
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2008-05-12 07:43:41 -06:00
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};
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2008-04-28 19:52:36 -06:00
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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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.cpu = 0, \
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2009-07-10 06:57:56 -06:00
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.preempt_count = INIT_PREEMPT_COUNT, \
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2008-04-28 19:52:36 -06:00
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.addr_limit = KERNEL_DS, \
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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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2008-05-12 07:43:41 -06:00
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#else /* !__ASSEMBLY__ */
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#include <asm/asm-offsets.h>
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#endif
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2008-04-28 19:52:38 -06:00
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/*
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* thread information flags
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* - these are process state flags that various assembly files
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* may need to access
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* - pending work-to-be-done flags are in LSW
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* - other flags in MSW
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* Warning: layout of LSW is hardcoded in entry.S
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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2008-04-19 20:10:57 -06:00
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#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
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2008-04-28 19:52:38 -06:00
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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#define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/
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#define TIF_SYSCALL_EMU 6 /* syscall emulation active */
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#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
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#define TIF_SECCOMP 8 /* secure computing */
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#define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
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2009-09-19 00:40:22 -06:00
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#define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */
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uprobes/core: Handle breakpoint and singlestep exceptions
Uprobes uses exception notifiers to get to know if a thread hit
a breakpoint or a singlestep exception.
When a thread hits a uprobe or is singlestepping post a uprobe
hit, the uprobe exception notifier sets its TIF_UPROBE bit,
which will then be checked on its return to userspace path
(do_notify_resume() ->uprobe_notify_resume()), where the
consumers handlers are run (in task context) based on the
defined filters.
Uprobe hits are thread specific and hence we need to maintain
information about if a task hit a uprobe, what uprobe was hit,
the slot where the original instruction was copied for xol so
that it can be singlestepped with appropriate fixups.
In some cases, special care is needed for instructions that are
executed out of line (xol). These are architecture specific
artefacts, such as handling RIP relative instructions on x86_64.
Since the instruction at which the uprobe was inserted is
executed out of line, architecture specific fixups are added so
that the thread continues normal execution in the presence of a
uprobe.
Postpone the signals until we execute the probed insn.
post_xol() path does a recalc_sigpending() before return to
user-mode, this ensures the signal can't be lost.
Uprobes relies on DIE_DEBUG notification to notify if a
singlestep is complete.
Adds x86 specific uprobe exception notifiers and appropriate
hooks needed to determine a uprobe hit and subsequent post
processing.
Add requisite x86 fixups for xol for uprobes. Specific cases
needing fixups include relative jumps (x86_64), calls, etc.
Where possible, we check and skip singlestepping the
breakpointed instructions. For now we skip single byte as well
as few multibyte nop instructions. However this can be extended
to other instructions too.
Credits to Oleg Nesterov for suggestions/patches related to
signal, breakpoint, singlestep handling code.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@linux.vnet.ibm.com>
Cc: Linux-mm <linux-mm@kvack.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120313180011.29771.89027.sendpatchset@srdronam.in.ibm.com
[ Performed various cleanliness edits ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2012-03-13 12:00:11 -06:00
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#define TIF_UPROBE 12 /* breakpointed or singlestepping */
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2008-04-28 19:52:38 -06:00
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#define TIF_NOTSC 16 /* TSC is not accessible in userland */
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2012-02-06 14:03:09 -07:00
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#define TIF_IA32 17 /* IA32 compatibility process */
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2008-04-28 19:52:38 -06:00
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#define TIF_FORK 18 /* ret_from_fork */
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2012-07-11 12:26:34 -06:00
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#define TIF_NOHZ 19 /* in adaptive nohz mode */
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2010-05-14 03:13:27 -06:00
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#define TIF_MEMDIE 20 /* is terminating due to OOM killer */
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2008-04-28 19:52:38 -06:00
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#define TIF_DEBUG 21 /* uses debug registers */
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#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
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#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */
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2010-03-25 07:51:51 -06:00
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#define TIF_BLOCKSTEP 25 /* set when we want DEBUGCTLMSR_BTF */
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2009-02-18 00:46:21 -07:00
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#define TIF_LAZY_MMU_UPDATES 27 /* task is updating the mmu lazily */
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2009-08-24 15:43:11 -06:00
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#define TIF_SYSCALL_TRACEPOINT 28 /* syscall tracepoint instrumentation */
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2012-02-06 14:03:09 -07:00
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#define TIF_ADDR32 29 /* 32-bit address space on 64 bits */
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2012-02-14 14:56:49 -07:00
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#define TIF_X32 30 /* 32-bit native x86-64 binary */
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2008-04-28 19:52:38 -06:00
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#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
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2008-04-19 20:10:57 -06:00
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#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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2008-04-28 19:52:38 -06:00
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#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
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#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
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#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
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#define _TIF_SECCOMP (1 << TIF_SECCOMP)
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#define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY)
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2009-09-19 00:40:22 -06:00
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#define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY)
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uprobes/core: Handle breakpoint and singlestep exceptions
Uprobes uses exception notifiers to get to know if a thread hit
a breakpoint or a singlestep exception.
When a thread hits a uprobe or is singlestepping post a uprobe
hit, the uprobe exception notifier sets its TIF_UPROBE bit,
which will then be checked on its return to userspace path
(do_notify_resume() ->uprobe_notify_resume()), where the
consumers handlers are run (in task context) based on the
defined filters.
Uprobe hits are thread specific and hence we need to maintain
information about if a task hit a uprobe, what uprobe was hit,
the slot where the original instruction was copied for xol so
that it can be singlestepped with appropriate fixups.
In some cases, special care is needed for instructions that are
executed out of line (xol). These are architecture specific
artefacts, such as handling RIP relative instructions on x86_64.
Since the instruction at which the uprobe was inserted is
executed out of line, architecture specific fixups are added so
that the thread continues normal execution in the presence of a
uprobe.
Postpone the signals until we execute the probed insn.
post_xol() path does a recalc_sigpending() before return to
user-mode, this ensures the signal can't be lost.
Uprobes relies on DIE_DEBUG notification to notify if a
singlestep is complete.
Adds x86 specific uprobe exception notifiers and appropriate
hooks needed to determine a uprobe hit and subsequent post
processing.
Add requisite x86 fixups for xol for uprobes. Specific cases
needing fixups include relative jumps (x86_64), calls, etc.
Where possible, we check and skip singlestepping the
breakpointed instructions. For now we skip single byte as well
as few multibyte nop instructions. However this can be extended
to other instructions too.
Credits to Oleg Nesterov for suggestions/patches related to
signal, breakpoint, singlestep handling code.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@linux.vnet.ibm.com>
Cc: Linux-mm <linux-mm@kvack.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120313180011.29771.89027.sendpatchset@srdronam.in.ibm.com
[ Performed various cleanliness edits ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2012-03-13 12:00:11 -06:00
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#define _TIF_UPROBE (1 << TIF_UPROBE)
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2008-04-28 19:52:38 -06:00
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#define _TIF_NOTSC (1 << TIF_NOTSC)
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#define _TIF_IA32 (1 << TIF_IA32)
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#define _TIF_FORK (1 << TIF_FORK)
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2012-07-11 12:26:34 -06:00
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#define _TIF_NOHZ (1 << TIF_NOHZ)
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2008-04-28 19:52:38 -06:00
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#define _TIF_DEBUG (1 << TIF_DEBUG)
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#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
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#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
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2010-03-25 07:51:51 -06:00
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#define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP)
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2009-02-18 00:46:21 -07:00
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#define _TIF_LAZY_MMU_UPDATES (1 << TIF_LAZY_MMU_UPDATES)
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2009-08-24 15:43:11 -06:00
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#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
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2012-02-06 14:03:09 -07:00
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#define _TIF_ADDR32 (1 << TIF_ADDR32)
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2012-02-14 14:56:49 -07:00
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#define _TIF_X32 (1 << TIF_X32)
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2008-04-28 19:52:38 -06:00
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2008-07-09 03:38:07 -06:00
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/* work to do in syscall_trace_enter() */
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#define _TIF_WORK_SYSCALL_ENTRY \
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2009-08-24 15:43:11 -06:00
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(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT | \
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2012-07-11 12:26:34 -06:00
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_TIF_SECCOMP | _TIF_SINGLESTEP | _TIF_SYSCALL_TRACEPOINT | \
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_TIF_NOHZ)
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2008-07-09 03:38:07 -06:00
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/* work to do in syscall_trace_leave() */
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#define _TIF_WORK_SYSCALL_EXIT \
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2009-03-06 21:53:00 -07:00
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(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP | \
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2012-07-11 12:26:34 -06:00
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_TIF_SYSCALL_TRACEPOINT | _TIF_NOHZ)
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2008-07-09 03:38:07 -06:00
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2008-04-28 19:52:39 -06:00
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/* work to do on interrupt/exception return */
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#define _TIF_WORK_MASK \
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(0x0000FFFF & \
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2008-07-09 02:33:14 -06:00
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~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT| \
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2008-07-09 03:38:07 -06:00
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_TIF_SINGLESTEP|_TIF_SECCOMP|_TIF_SYSCALL_EMU))
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2008-04-28 19:52:39 -06:00
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/* work to do on any return to user space */
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2009-08-24 15:43:11 -06:00
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#define _TIF_ALLWORK_MASK \
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2012-07-11 12:26:34 -06:00
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((0x0000FFFF & ~_TIF_SECCOMP) | _TIF_SYSCALL_TRACEPOINT | \
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_TIF_NOHZ)
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2008-04-28 19:52:39 -06:00
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2008-04-28 19:52:40 -06:00
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/* Only used for 64 bit */
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2008-04-28 19:52:39 -06:00
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#define _TIF_DO_NOTIFY_MASK \
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2009-09-19 00:40:22 -06:00
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(_TIF_SIGPENDING | _TIF_MCE_NOTIFY | _TIF_NOTIFY_RESUME | \
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_TIF_USER_RETURN_NOTIFY)
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2008-04-28 19:52:39 -06:00
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/* flags to check in __switch_to() */
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#define _TIF_WORK_CTXSW \
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2010-03-25 07:51:51 -06:00
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(_TIF_IO_BITMAP|_TIF_NOTSC|_TIF_BLOCKSTEP)
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2008-04-28 19:52:39 -06:00
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2009-09-19 00:40:22 -06:00
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#define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
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2008-04-28 19:52:39 -06:00
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#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)
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2008-04-28 19:52:37 -06:00
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#define PREEMPT_ACTIVE 0x10000000
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2008-04-28 19:52:40 -06:00
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#ifdef CONFIG_X86_32
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#define STACK_WARN (THREAD_SIZE/8)
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2008-05-12 07:43:41 -06:00
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/*
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* macros/functions for gaining access to the thread information structure
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*
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* preempt_count needs to be 1 initially, until the scheduler is functional.
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*/
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#ifndef __ASSEMBLY__
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/* how to get the current stack pointer from C */
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register unsigned long current_stack_pointer asm("esp") __used;
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/* how to get the thread information struct from C */
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static inline struct thread_info *current_thread_info(void)
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{
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return (struct thread_info *)
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(current_stack_pointer & ~(THREAD_SIZE - 1));
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}
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#else /* !__ASSEMBLY__ */
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/* how to get the thread information struct from ASM */
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#define GET_THREAD_INFO(reg) \
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movl $-THREAD_SIZE, reg; \
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andl %esp, reg
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/* use this one if reg already contains %esp */
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#define GET_THREAD_INFO_WITH_ESP(reg) \
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andl $-THREAD_SIZE, reg
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#endif
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#else /* X86_32 */
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2009-01-18 08:38:58 -07:00
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#include <asm/percpu.h>
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#define KERNEL_STACK_OFFSET (5*8)
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2008-05-12 07:43:41 -06:00
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/*
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* macros/functions for gaining access to the thread information structure
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* preempt_count needs to be 1 initially, until the scheduler is functional.
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*/
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#ifndef __ASSEMBLY__
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2009-01-18 08:38:58 -07:00
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DECLARE_PER_CPU(unsigned long, kernel_stack);
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2008-05-12 07:43:41 -06:00
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2009-01-18 08:38:58 -07:00
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static inline struct thread_info *current_thread_info(void)
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2008-05-12 07:43:41 -06:00
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{
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struct thread_info *ti;
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2012-05-11 01:35:27 -06:00
|
|
|
ti = (void *)(this_cpu_read_stable(kernel_stack) +
|
2009-01-18 08:38:58 -07:00
|
|
|
KERNEL_STACK_OFFSET - THREAD_SIZE);
|
2008-05-12 07:43:41 -06:00
|
|
|
return ti;
|
|
|
|
}
|
|
|
|
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
|
|
|
|
/* how to get the thread information struct from ASM */
|
|
|
|
#define GET_THREAD_INFO(reg) \
|
2009-01-18 08:38:58 -07:00
|
|
|
movq PER_CPU_VAR(kernel_stack),reg ; \
|
|
|
|
subq $(THREAD_SIZE-KERNEL_STACK_OFFSET),reg
|
2008-05-12 07:43:41 -06:00
|
|
|
|
2011-11-29 04:17:45 -07:00
|
|
|
/*
|
|
|
|
* 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)
|
|
|
|
|
2008-05-12 07:43:41 -06:00
|
|
|
#endif
|
|
|
|
|
2008-04-28 19:52:34 -06:00
|
|
|
#endif /* !X86_32 */
|
|
|
|
|
2008-05-12 07:43:41 -06:00
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|
2008-04-28 19:52:34 -06:00
|
|
|
#define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/
|
2010-05-24 09:34:36 -06:00
|
|
|
#define TS_POLLING 0x0004 /* idle task polling need_resched,
|
|
|
|
skip sending interrupt */
|
2008-04-30 14:13:44 -06:00
|
|
|
#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */
|
2008-05-12 07:43:41 -06:00
|
|
|
|
|
|
|
#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
|
|
|
|
|
2008-04-30 14:13:44 -06:00
|
|
|
#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;
|
2012-04-27 11:42:45 -06:00
|
|
|
WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
|
2008-04-30 14:13:44 -06:00
|
|
|
}
|
2012-04-26 20:29:20 -06:00
|
|
|
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;
|
|
|
|
}
|
2012-03-13 08:03:03 -06:00
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
2008-04-30 14:13:44 -06:00
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
|
2008-03-10 16:28:04 -06:00
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
extern void arch_task_cache_init(void);
|
|
|
|
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
|
2012-05-05 09:05:42 -06:00
|
|
|
extern void arch_release_task_struct(struct task_struct *tsk);
|
2008-03-10 16:28:04 -06:00
|
|
|
#endif
|
2008-10-22 23:26:29 -06:00
|
|
|
#endif /* _ASM_X86_THREAD_INFO_H */
|