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| author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2017-03-08 13:56:07 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-20 23:18:55 +1000 |
| commit | a64e3f35a45f4a84148d0ba30a3c75c4c7076928 (patch) | |
| tree | 0ace3f325af79dc5daccba251c511f262bea7b4d /arch/powerpc/kernel/kprobes.c | |
| parent | 290e3070762ac80e5fc4087d8c4de7e3f1d90aca (diff) | |
| download | linux-a64e3f35a45f4a84148d0ba30a3c75c4c7076928.tar.gz linux-a64e3f35a45f4a84148d0ba30a3c75c4c7076928.tar.bz2 linux-a64e3f35a45f4a84148d0ba30a3c75c4c7076928.zip | |
powerpc/kretprobes: Override default function entry offset
With ABIv2, we offset 8 bytes into a function to get at the local entry
point.
mpe: NB this function is currently not called, the change to generic code to
call it is being merged via the tip tree.
Acked-by: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/kprobes.c')
| -rw-r--r-- | arch/powerpc/kernel/kprobes.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c index 65828fbc410d..97b5eed1f76d 100644 --- a/arch/powerpc/kernel/kprobes.c +++ b/arch/powerpc/kernel/kprobes.c @@ -189,6 +189,15 @@ static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs, kcb->kprobe_saved_msr = regs->msr; } +bool arch_function_offset_within_entry(unsigned long offset) +{ +#ifdef PPC64_ELF_ABI_v2 + return offset <= 8; +#else + return !offset; +#endif +} + void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) { |