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| author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2017-04-19 18:22:26 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-24 19:07:58 +1000 |
| commit | ead514d5fb30a0889d51c0f0e35c3e346165a955 (patch) | |
| tree | a6fb97f2cfce93e5c8ff10351cd3f4763ae1fc4e /arch/powerpc/kernel/kprobes.c | |
| parent | 2f59be5b970b503ca8db1cb723b155e455ebac8e (diff) | |
| download | linux-ead514d5fb30a0889d51c0f0e35c3e346165a955.tar.bz2 | |
powerpc/kprobes: Add support for KPROBES_ON_FTRACE
Allow kprobes to be placed on ftrace _mcount() call sites. This optimization
avoids the use of a trap, by riding on ftrace infrastructure.
This depends on HAVE_DYNAMIC_FTRACE_WITH_REGS which depends on MPROFILE_KERNEL,
which is only currently enabled on powerpc64le with newer toolchains.
Based on the x86 code by Masami.
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 | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c index b71922618ed2..50aabf819787 100644 --- a/arch/powerpc/kernel/kprobes.c +++ b/arch/powerpc/kernel/kprobes.c @@ -192,7 +192,11 @@ static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs, bool arch_function_offset_within_entry(unsigned long offset) { #ifdef PPC64_ELF_ABI_v2 +#ifdef CONFIG_KPROBES_ON_FTRACE + return offset <= 16; +#else return offset <= 8; +#endif #else return !offset; #endif @@ -301,7 +305,9 @@ int __kprobes kprobe_handler(struct pt_regs *regs) } p = __this_cpu_read(current_kprobe); if (p->break_handler && p->break_handler(p, regs)) { - goto ss_probe; + if (!skip_singlestep(p, regs, kcb)) + goto ss_probe; + ret = 1; } } goto no_kprobe; |