[RFC 0/4] arm64: add livepatch support
huawei.libin at huawei.com
Wed May 27 23:06:48 PDT 2015
On 2015/4/24 17:27, Jiri Kosina wrote:
> On Fri, 24 Apr 2015, AKASHI Takahiro wrote:
>> This patchset enables livepatch support on arm64.
>> Livepatch was merged in v4.0, and allows replacying a function dynamically
>> based on ftrace framework, but it also requires -mfentry option of gcc.
>> Currently arm64 gcc doesn't support it, but by adding a helper function to
>> ftrace, we will be able to support livepatch on arch's which don't support
>> this option.
>> I submit this patchset as RFC since I'm not quite sure that I'm doing
>> in the right way, or we should definitely support -fentry instead.
> I don't have arm64 cross-compiler handy, could you please copy/paste how
> does function prologue, generated by gcc -pg on arm64 look like?
The function prologue on arm64 with gcc -pg look like as following:
stp x29, x30, [sp, -48]!
add x29, sp, 0
mov x1, x30
str w0, [x29,28]
mov x0, x1
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