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Arch specific helpers handle 64-bit data copy using 32 bit regs. Need to validate fsession support along with trampoline support. v1->v2: No change since v1 [v1]: https://lore.kernel.org/bpf/20260216155310.38457-1-adubey@linux.ibm.com Signed-off-by: Abhishek Dubey --- arch/powerpc/net/bpf_jit_comp.c | 8 ++++++- arch/powerpc/net/bpf_jit_comp32.c | 35 +++++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index 6d334c0c3d85..8e6bfba37a67 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -542,7 +542,13 @@ bool bpf_jit_supports_private_stack(void) bool bpf_jit_supports_fsession(void) { - return IS_ENABLED(CONFIG_PPC64); + /* + * TODO: Remove after validating support + * for fsession and trampoline on ppc32. + */ + if (IS_ENABLED(CONFIG_PPC32)) + return -EOPNOTSUPP; + return true; } bool bpf_jit_supports_arena(void) diff --git a/arch/powerpc/net/bpf_jit_comp32.c b/arch/powerpc/net/bpf_jit_comp32.c index 3087e744fb25..72dc2a55d66c 100644 --- a/arch/powerpc/net/bpf_jit_comp32.c +++ b/arch/powerpc/net/bpf_jit_comp32.c @@ -123,6 +123,41 @@ void bpf_jit_realloc_regs(struct codegen_context *ctx) } } +void prepare_for_fsession_fentry(u32 *image, struct codegen_context *ctx, int cookie_cnt, + int cookie_off, int retval_off) +{ + /* + * Set session cookies value + * Clear cookies field on stack + * Ensure retval to be cleared on fentry + */ + EMIT(PPC_RAW_LI(bpf_to_ppc(TMP_REG), 0)); + + for (int i = 0; i < cookie_cnt; i++) { + EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, cookie_off + 4 * i)); + EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, cookie_off + 4 * i + 4)); + } + + EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, retval_off)); + EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, retval_off + 4)); +} + +void store_func_meta(u32 *image, struct codegen_context *ctx, + u64 func_meta, int func_meta_off) +{ + /* + * Store func_meta to stack: [R1 + func_meta_off] = func_meta + * func_meta := argument count in first byte + cookie value + */ + /* Store lower word */ + EMIT(PPC_RAW_LI(bpf_to_ppc(TMP_REG), (u32)func_meta)); + EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, func_meta_off)); + + /* Store upper word */ + EMIT(PPC_RAW_LI(bpf_to_ppc(TMP_REG), (u32)(func_meta >> 32))); + EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, func_meta_off + 4)); +} + void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx) { int i; -- 2.52.0