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author | Ilya Leoshkevich <iii@linux.ibm.com> | 2019-07-04 16:18:15 +0200 |
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committer | Vasily Gorbik <gor@linux.ibm.com> | 2019-11-30 10:52:44 +0100 |
commit | 914d52e46490b6599b7f03fad233f4f19bf23cf7 (patch) | |
tree | fc4a50362037e203cfacff290f77f8db02df8fb6 /drivers/s390 | |
parent | ea1f56fa16ae5f6e67f6ea03836b36c6053d33d1 (diff) |
s390: implement perf_arch_fetch_caller_regs
On s390 bpf_get_stack_raw_tp() returns 0 entries for both kernel and
user stacks. While there is no practical unwinding solution for userspace
on s390 at this moment, there certainly is a kernel unwinder. However,
it is not properly integrated with BPF.
In order to start unwinding, bpf_get_stack_raw_tp() obtains the current
kernel register values using perf_fetch_caller_regs(), which is not
implemented for s390. The actual unwinding then happens by passing those
registers to perf_callchain_kernel().
Implement perf_arch_fetch_caller_regs() for s390, where
__builtin_frame_address(0) points to back_chain.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'drivers/s390')
0 files changed, 0 insertions, 0 deletions