bpf, mips: Implement DADDI workarounds for JIT
authorJiaxun Yang <jiaxun.yang@flygoat.com>
Tue, 28 Feb 2023 11:33:04 +0000 (11:33 +0000)
committerDaniel Borkmann <daniel@iogearbox.net>
Tue, 28 Feb 2023 13:52:40 +0000 (14:52 +0100)
commitbbefef2f07080cd502a93cb1c529e1c8a6c4ac8e
tree559de75a3e3d3affdbe6991b5d5a867e6ff8dc2e
parentc8ee37bde4021a275d2e4f33bd48d54912bb00c4
bpf, mips: Implement DADDI workarounds for JIT

For DADDI errata we just workaround by disable immediate operation
for BPF_ADD / BPF_SUB to avoid generation of DADDIU.

All other use cases in JIT won't cause overflow thus they are all safe.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Link: https://lore.kernel.org/bpf/20230228113305.83751-2-jiaxun.yang@flygoat.com
arch/mips/Kconfig
arch/mips/net/bpf_jit_comp.c