bpf: emit empty epilogues in naked functions

This patch fixes the BPF backend to not generate `exit' (return)
instructions in epilogues of functions that are declared as naked via
the corresponding compiler attribute.  Having extra exit instructions
upsets the kernel BPF verifier.

Tested in bpf-unknown-none target in x86_64-linux-gnu host.

gcc/ChangeLog

	* config/bpf/bpf.cc (bpf_expand_epilogue): Do not emit a return
	instruction in naked function epilogues.

gcc/testsuite/ChangeLog

	* gcc.target/bpf/naked-1.c: Update test to not expect an exit
	instruction in naked function.
	* gcc.target/bpf/naked-2.c: New test.

0 files changed, 0 insertions, 0 deletions