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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| .. | ||
| vdso32 | ||
| vdso64 | ||
| align.c | ||
| asm-offsets.c | ||
| binfmt_elf32.c | ||
| bitops.c | ||
| bpa_iic.c | ||
| bpa_iic.h | ||
| bpa_iommu.c | ||
| bpa_iommu.h | ||
| bpa_nvram.c | ||
| bpa_setup.c | ||
| btext.c | ||
| cpu_setup_power4.S | ||
| cputable.c | ||
| dma.c | ||
| eeh.c | ||
| entry.S | ||
| head.S | ||
| HvCall.c | ||
| hvCall.S | ||
| hvconsole.c | ||
| hvcserver.c | ||
| HvLpConfig.c | ||
| HvLpEvent.c | ||
| i8259.c | ||
| i8259.h | ||
| idle_power4.S | ||
| idle.c | ||
| init_task.c | ||
| ioctl32.c | ||
| iomap.c | ||
| iommu.c | ||
| irq.c | ||
| iSeries_htab.c | ||
| iSeries_iommu.c | ||
| iSeries_irq.c | ||
| iSeries_pci.c | ||
| iSeries_proc.c | ||
| iSeries_setup.c | ||
| iSeries_setup.h | ||
| iSeries_smp.c | ||
| iSeries_VpdInfo.c | ||
| ItLpQueue.c | ||
| kprobes.c | ||
| lmb.c | ||
| lparcfg.c | ||
| LparData.c | ||
| machine_kexec.c | ||
| Makefile | ||
| maple_pci.c | ||
| maple_setup.c | ||
| maple_time.c | ||
| mf.c | ||
| misc.S | ||
| module.c | ||
| mpic.c | ||
| mpic.h | ||
| nvram.c | ||
| of_device.c | ||
| pacaData.c | ||
| pci_direct_iommu.c | ||
| pci_dn.c | ||
| pci_iommu.c | ||
| pci.c | ||
| pci.h | ||
| pmac_feature.c | ||
| pmac_low_i2c.c | ||
| pmac_nvram.c | ||
| pmac_pci.c | ||
| pmac_setup.c | ||
| pmac_smp.c | ||
| pmac_time.c | ||
| pmac.h | ||
| pmc.c | ||
| ppc_ksyms.c | ||
| proc_ppc64.c | ||
| process.c | ||
| prom_init.c | ||
| prom.c | ||
| pSeries_hvCall.S | ||
| pSeries_iommu.c | ||
| pSeries_lpar.c | ||
| pSeries_nvram.c | ||
| pSeries_pci.c | ||
| pSeries_reconfig.c | ||
| pSeries_setup.c | ||
| pSeries_smp.c | ||
| ptrace32.c | ||
| ptrace.c | ||
| ras.c | ||
| rtas_flash.c | ||
| rtas_pci.c | ||
| rtas-proc.c | ||
| rtas.c | ||
| rtasd.c | ||
| rtc.c | ||
| scanlog.c | ||
| semaphore.c | ||
| setup.c | ||
| signal32.c | ||
| signal.c | ||
| smp-tbsync.c | ||
| smp.c | ||
| spider-pic.c | ||
| sys_ppc32.c | ||
| syscalls.c | ||
| sysfs.c | ||
| time.c | ||
| traps.c | ||
| u3_iommu.c | ||
| udbg.c | ||
| vdso.c | ||
| vecemu.c | ||
| vector.S | ||
| vio.c | ||
| viopath.c | ||
| vmlinux.lds.S | ||
| xics.c | ||