diff options
Diffstat (limited to 'arch/powerpc/net/bpf_jit_comp32.c')
| -rw-r--r-- | arch/powerpc/net/bpf_jit_comp32.c | 43 |
1 files changed, 36 insertions, 7 deletions
diff --git a/arch/powerpc/net/bpf_jit_comp32.c b/arch/powerpc/net/bpf_jit_comp32.c index c4db278dae36..bfdc50740da8 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 */ + PPC_LI32(bpf_to_ppc(TMP_REG), (u32)func_meta); + EMIT(PPC_RAW_STW(bpf_to_ppc(TMP_REG), _R1, func_meta_off)); + + /* Store upper word */ + PPC_LI32(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; @@ -313,7 +348,6 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code u64 func_addr; u32 true_cond; u32 tmp_idx; - int j; if (i && (BPF_CLASS(code) == BPF_ALU64 || BPF_CLASS(code) == BPF_ALU) && (BPF_CLASS(prevcode) == BPF_ALU64 || BPF_CLASS(prevcode) == BPF_ALU) && @@ -1088,7 +1122,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code } ret = bpf_add_extable_entry(fp, image, fimage, pass, ctx, insn_idx, - jmp_off, dst_reg); + jmp_off, dst_reg, code); if (ret) return ret; } @@ -1099,13 +1133,8 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code * 16 byte instruction that uses two 'struct bpf_insn' */ case BPF_LD | BPF_IMM | BPF_DW: /* dst = (u64) imm */ - tmp_idx = ctx->idx; PPC_LI32(dst_reg_h, (u32)insn[i + 1].imm); PPC_LI32(dst_reg, (u32)insn[i].imm); - /* padding to allow full 4 instructions for later patching */ - if (!image) - for (j = ctx->idx - tmp_idx; j < 4; j++) - EMIT(PPC_RAW_NOP()); /* Adjust for two bpf instructions */ addrs[++i] = ctx->idx * 4; break; |