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x86, bts: add fork and exit handling

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Impact: introduce new ptrace facility

Add arch_ptrace_untrace() function that is called when the tracer
detaches (either voluntarily or when the tracing task dies);
ptrace_disable() is only called on a voluntary detach.

Add ptrace_fork() and arch_ptrace_fork(). They are called when a
traced task is forked.

Clear DS and BTS related fields on fork.

Release DS resources and reclaim memory in ptrace_untrace(). This
releases resources already when the tracing task dies. We used to do
that when the traced task dies.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Markus Metzger
2008-12-19 15:10:24 +01:00
committed by Ingo Molnar
parent 30cd324e97
commit bf53de907d
9 changed files with 119 additions and 30 deletions
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7
arch/x86/include/asm/ptrace.h
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@@ -235,6 +235,13 @@ extern int do_get_thread_area(struct task_struct *p, int idx,
extern int do_set_thread_area(struct task_struct *p, int idx,
struct user_desc __user *info, int can_allocate);
extern void x86_ptrace_untrace(struct task_struct *);
extern void x86_ptrace_fork(struct task_struct *child,
unsigned long clone_flags);
#define arch_ptrace_untrace(tsk) x86_ptrace_untrace(tsk)
#define arch_ptrace_fork(child, flags) x86_ptrace_fork(child, flags)
#endif /* __KERNEL__ */
#endif /* !__ASSEMBLY__ */