diff options
Diffstat (limited to 'arch/arm64/net/bpf_jit_comp.c')
| -rw-r--r-- | arch/arm64/net/bpf_jit_comp.c | 86 |
1 files changed, 66 insertions, 20 deletions
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index bb32f7f6dd0f..1d4f1da7c58f 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -31,8 +31,6 @@ #include "bpf_jit.h" -int bpf_jit_enable __read_mostly; - #define TMP_REG_1 (MAX_BPF_JIT_REG + 0) #define TMP_REG_2 (MAX_BPF_JIT_REG + 1) #define TCALL_CNT (MAX_BPF_JIT_REG + 2) @@ -99,6 +97,20 @@ static inline void emit_a64_mov_i64(const int reg, const u64 val, } } +static inline void emit_addr_mov_i64(const int reg, const u64 val, + struct jit_ctx *ctx) +{ + u64 tmp = val; + int shift = 0; + + emit(A64_MOVZ(1, reg, tmp & 0xffff, shift), ctx); + for (;shift < 48;) { + tmp >>= 16; + shift += 16; + emit(A64_MOVK(1, reg, tmp & 0xffff, shift), ctx); + } +} + static inline void emit_a64_mov_i(const int is64, const int reg, const s32 val, struct jit_ctx *ctx) { @@ -378,18 +390,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx) case BPF_ALU64 | BPF_DIV | BPF_X: case BPF_ALU | BPF_MOD | BPF_X: case BPF_ALU64 | BPF_MOD | BPF_X: - { - const u8 r0 = bpf2a64[BPF_REG_0]; - - /* if (src == 0) return 0 */ - jmp_offset = 3; /* skip ahead to else path */ - check_imm19(jmp_offset); - emit(A64_CBNZ(is64, src, jmp_offset), ctx); - emit(A64_MOVZ(1, r0, 0, 0), ctx); - jmp_offset = epilogue_offset(ctx); - check_imm26(jmp_offset); - emit(A64_B(jmp_offset), ctx); - /* else */ switch (BPF_OP(code)) { case BPF_DIV: emit(A64_UDIV(is64, dst, dst, src), ctx); @@ -401,7 +401,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx) break; } break; - } case BPF_ALU | BPF_LSH | BPF_X: case BPF_ALU64 | BPF_LSH | BPF_X: emit(A64_LSLV(is64, dst, dst, src), ctx); @@ -605,7 +604,10 @@ emit_cond_jmp: const u8 r0 = bpf2a64[BPF_REG_0]; const u64 func = (u64)__bpf_call_base + imm; - emit_a64_mov_i64(tmp, func, ctx); + if (ctx->prog->is_func) + emit_addr_mov_i64(tmp, func, ctx); + else + emit_a64_mov_i64(tmp, func, ctx); emit(A64_BLR(tmp), ctx); emit(A64_MOV(1, r0, A64_R(0)), ctx); break; @@ -837,16 +839,24 @@ static inline void bpf_flush_icache(void *start, void *end) flush_icache_range((unsigned long)start, (unsigned long)end); } +struct arm64_jit_data { + struct bpf_binary_header *header; + u8 *image; + struct jit_ctx ctx; +}; + struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog) { struct bpf_prog *tmp, *orig_prog = prog; struct bpf_binary_header *header; + struct arm64_jit_data *jit_data; bool tmp_blinded = false; + bool extra_pass = false; struct jit_ctx ctx; int image_size; u8 *image_ptr; - if (!bpf_jit_enable) + if (!prog->jit_requested) return orig_prog; tmp = bpf_jit_blind_constants(prog); @@ -860,13 +870,30 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog) prog = tmp; } + jit_data = prog->aux->jit_data; + if (!jit_data) { + jit_data = kzalloc(sizeof(*jit_data), GFP_KERNEL); + if (!jit_data) { + prog = orig_prog; + goto out; + } + prog->aux->jit_data = jit_data; + } + if (jit_data->ctx.offset) { + ctx = jit_data->ctx; + image_ptr = jit_data->image; + header = jit_data->header; + extra_pass = true; + image_size = sizeof(u32) * ctx.idx; + goto skip_init_ctx; + } memset(&ctx, 0, sizeof(ctx)); ctx.prog = prog; ctx.offset = kcalloc(prog->len, sizeof(int), GFP_KERNEL); if (ctx.offset == NULL) { prog = orig_prog; - goto out; + goto out_off; } /* 1. Initial fake pass to compute ctx->idx. */ @@ -897,6 +924,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog) /* 2. Now, the actual pass. */ ctx.image = (__le32 *)image_ptr; +skip_init_ctx: ctx.idx = 0; build_prologue(&ctx); @@ -922,13 +950,31 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog) bpf_flush_icache(header, ctx.image + ctx.idx); - bpf_jit_binary_lock_ro(header); + if (!prog->is_func || extra_pass) { + if (extra_pass && ctx.idx != jit_data->ctx.idx) { + pr_err_once("multi-func JIT bug %d != %d\n", + ctx.idx, jit_data->ctx.idx); + bpf_jit_binary_free(header); + prog->bpf_func = NULL; + prog->jited = 0; + goto out_off; + } + bpf_jit_binary_lock_ro(header); + } else { + jit_data->ctx = ctx; + jit_data->image = image_ptr; + jit_data->header = header; + } prog->bpf_func = (void *)ctx.image; prog->jited = 1; prog->jited_len = image_size; + if (!prog->is_func || extra_pass) { out_off: - kfree(ctx.offset); + kfree(ctx.offset); + kfree(jit_data); + prog->aux->jit_data = NULL; + } out: if (tmp_blinded) bpf_jit_prog_release_other(prog, prog == orig_prog ? |