97f7943d70
The following is a patch provided by Ananth Mavinakayanahalli that implements
the new PPC64 specific parts of the new function return probe design.
NOTE: Since getting Ananth's patch, I changed trampoline_probe_handler()
to consume each of the outstanding return probem instances (feedback
on my original RFC after Ananth cut a patch), and also added the
arch_init() function (adding arch specific initialization.) I have
cross compiled but have not testing this on a PPC64 machine.
Changes include:
* Addition of kretprobe_trampoline to act as a dummy function for instrumented
functions to return to, and for the return probe infrastructure to place
a kprobe on on, gaining control so that the return probe handler
can be called, and so that the instruction pointer can be moved back
to the original return address.
* Addition of arch_init(), allowing a kprobe to be registered on
kretprobe_trampoline
* Addition of trampoline_probe_handler() which is used as the pre_handler
for the kprobe inserted on kretprobe_implementation. This is the function
that handles the details for calling the return probe handler function
and returning control back at the original return address
* Addition of arch_prepare_kretprobe() which is setup as the pre_handler
for a kprobe registered at the beginning of the target function by
kernel/kprobes.c so that a return probe instance can be setup when
a caller enters the target function. (A return probe instance contains
all the needed information for trampoline_probe_handler to do it's job.)
* Hooks added to the exit path of a task so that we can cleanup any left-over
return probe instances (i.e. if a task dies while inside a targeted function
then the return probe instance was reserved at the beginning of the function
but the function never returns so we need to mark the instance as unused.)
Signed-off-by: Rusty Lynch <rusty.lynch@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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| .. | ||
| iSeries | ||
| 8253pit.h | ||
| a.out.h | ||
| abs_addr.h | ||
| agp.h | ||
| atomic.h | ||
| bitops.h | ||
| bootinfo.h | ||
| btext.h | ||
| bug.h | ||
| bugs.h | ||
| byteorder.h | ||
| cache.h | ||
| cacheflush.h | ||
| checksum.h | ||
| compat.h | ||
| cputable.h | ||
| cputime.h | ||
| current.h | ||
| dbdma.h | ||
| delay.h | ||
| div64.h | ||
| dma-mapping.h | ||
| dma.h | ||
| eeh.h | ||
| elf.h | ||
| errno.h | ||
| fcntl.h | ||
| floppy.h | ||
| hardirq.h | ||
| hdreg.h | ||
| hvcall.h | ||
| hvconsole.h | ||
| hvcserver.h | ||
| hw_irq.h | ||
| ide.h | ||
| imalloc.h | ||
| io.h | ||
| ioctl.h | ||
| ioctls.h | ||
| iommu.h | ||
| ipc.h | ||
| ipcbuf.h | ||
| irq.h | ||
| kdebug.h | ||
| kexec.h | ||
| keylargo.h | ||
| kmap_types.h | ||
| kprobes.h | ||
| linkage.h | ||
| lmb.h | ||
| local.h | ||
| lppaca.h | ||
| machdep.h | ||
| macio.h | ||
| mc146818rtc.h | ||
| memory.h | ||
| mman.h | ||
| mmu.h | ||
| mmu_context.h | ||
| mmzone.h | ||
| module.h | ||
| msgbuf.h | ||
| naca.h | ||
| namei.h | ||
| numnodes.h | ||
| nvram.h | ||
| of_device.h | ||
| paca.h | ||
| page.h | ||
| param.h | ||
| parport.h | ||
| pci-bridge.h | ||
| pci.h | ||
| percpu.h | ||
| pgalloc.h | ||
| pgtable.h | ||
| plpar_wrappers.h | ||
| pmac_feature.h | ||
| pmac_low_i2c.h | ||
| pmc.h | ||
| poll.h | ||
| posix_types.h | ||
| ppc32.h | ||
| ppc_asm.h | ||
| ppcdebug.h | ||
| processor.h | ||
| prom.h | ||
| pSeries_reconfig.h | ||
| ptrace-common.h | ||
| ptrace.h | ||
| resource.h | ||
| rtas.h | ||
| rwsem.h | ||
| scatterlist.h | ||
| seccomp.h | ||
| sections.h | ||
| segment.h | ||
| semaphore.h | ||
| sembuf.h | ||
| serial.h | ||
| setup.h | ||
| shmbuf.h | ||
| shmparam.h | ||
| sigcontext.h | ||
| siginfo.h | ||
| signal.h | ||
| smp.h | ||
| smu.h | ||
| socket.h | ||
| sockios.h | ||
| sparsemem.h | ||
| spinlock.h | ||
| sstep.h | ||
| stat.h | ||
| statfs.h | ||
| string.h | ||
| system.h | ||
| systemcfg.h | ||
| termbits.h | ||
| termios.h | ||
| thread_info.h | ||
| time.h | ||
| timex.h | ||
| tlb.h | ||
| tlbflush.h | ||
| topology.h | ||
| types.h | ||
| uaccess.h | ||
| ucontext.h | ||
| udbg.h | ||
| unaligned.h | ||
| uninorth.h | ||
| unistd.h | ||
| user.h | ||
| vdso.h | ||
| vga.h | ||
| vio.h | ||
| xics.h | ||
| xor.h | ||