Support trampoline for LoongArch #5483
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added 4 commits
June 20, 2025 11:37
Add branch jump function: larch_insn_gen_beq larch_insn_gen_bne Add instruction copy function: larch_insn_text_copy Co-developed-by: George Guo <[email protected]> Signed-off-by: George Guo <[email protected]> Co-developed-by: Youling Tang <[email protected]> Signed-off-by: Youling Tang <[email protected]> Signed-off-by: Chenghao Duan <[email protected]>
Implement the bpf_arch_text_poke function for the LoongArch architecture. On LoongArch, since symbol addresses in the direct mapping region cannot be reached via relative jump instructions from the paged mapping region, we use the move_imm+jirl instruction pair as absolute jump instructions. These require 2-5 instructions, so we reserve 5 NOP instructions in the program as placeholders for function jumps. Co-developed-by: George Guo <[email protected]> Signed-off-by: George Guo <[email protected]> Signed-off-by: Chenghao Duan <[email protected]>
BPF trampoline is the critical infrastructure of the BPF subsystem, acting as a mediator between kernel functions and BPF programs. Numerous important features, such as using BPF program for zero overhead kernel introspection, rely on this key component. The related tests have passed, Including the following technical points: 1. fentry 2. fmod_ret 3. fexit Co-developed-by: George Guo <[email protected]> Signed-off-by: George Guo <[email protected]> Signed-off-by: Chenghao Duan <[email protected]>
Update the code to rename validate_code to validate_ctx. validate_code is used to check the validity of code. validate_ctx is used to check both code validity and table entry correctness. Co-developed-by: George Guo <[email protected]> Signed-off-by: George Guo <[email protected]> Signed-off-by: Chenghao Duan <[email protected]>
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Pull request for series with
subject: Support trampoline for LoongArch
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=973377