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    SubjectRe: [RFC] [PATCH 2.6.37-rc5-tip 12/20] 12: uprobes: get the breakpoint address.
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    On Thu, 2010-12-16 at 15:29 +0530, Srikar Dronamraju wrote:
    > On a breakpoint hit, perform a architecture specific calculation to
    > return the address where the breakpoint was hit.

    And yet all the code added is generic ;-)

    > Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
    > Signed-off-by: Jim Keniston <jkenisto@us.ibm.com>
    > ---
    > include/linux/uprobes.h | 5 +++++
    > kernel/uprobes.c | 11 +++++++++++
    > 2 files changed, 16 insertions(+), 0 deletions(-)
    >
    > diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
    > index a631c42..ee12b2e 100644
    > --- a/include/linux/uprobes.h
    > +++ b/include/linux/uprobes.h
    > @@ -154,6 +154,7 @@ extern void uprobe_free_utask(struct task_struct *tsk);
    >
    > struct vm_area_struct;
    > extern void uprobe_mmap(struct vm_area_struct *vma);
    > +extern unsigned long uprobes_get_bkpt_addr(struct pt_regs *regs);
    > extern void uprobe_dup_mmap(struct mm_struct *old_mm, struct mm_struct *mm);
    > extern void uprobes_free_xol_area(struct mm_struct *mm);
    > #else /* CONFIG_UPROBES is not defined */
    > @@ -173,5 +174,9 @@ static inline void uprobe_dup_mmap(struct mm_struct *old_mm,
    > static inline void uprobe_free_utask(struct task_struct *tsk) {}
    > static inline void uprobe_mmap(struct vm_area_struct *vma) { }
    > static inline void uprobes_free_xol_area(struct mm_struct *mm) {}
    > +static inline unsigned long uprobes_get_bkpt_addr(struct pt_regs *regs)
    > +{
    > + return 0;
    > +}
    > #endif /* CONFIG_UPROBES */
    > #endif /* _LINUX_UPROBES_H */
    > diff --git a/kernel/uprobes.c b/kernel/uprobes.c
    > index 09e36f6..f486c4f 100644
    > --- a/kernel/uprobes.c
    > +++ b/kernel/uprobes.c
    > @@ -976,6 +976,17 @@ static void xol_free_insn_slot(struct task_struct *tsk, unsigned long slot_addr)
    > __func__, slot_addr);
    > }
    >
    > +/**
    > + * uprobes_get_bkpt_addr - compute address of bkpt given post-bkpt regs
    > + * @regs: Reflects the saved state of the task after it has hit a breakpoint
    > + * instruction.
    > + * Return the address of the breakpoint instruction.
    > + */
    > +unsigned long uprobes_get_bkpt_addr(struct pt_regs *regs)
    > +{
    > + return instruction_pointer(regs) - UPROBES_BKPT_INSN_SIZE;
    > +}
    > +
    > /*
    > * Called with no locks held.
    > * Called in context of a exiting or a exec-ing thread.




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