diff options
Diffstat (limited to 'arch/arm64/net/bpf_jit_comp.c')
| -rw-r--r-- | arch/arm64/net/bpf_jit_comp.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index c870d6f01ac2..2f0505b5c240 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -71,6 +71,7 @@ struct jit_ctx { int epilogue_offset; int *offset; u32 *image; + u32 stack_size; }; static inline void emit(const u32 insn, struct jit_ctx *ctx) @@ -147,16 +148,11 @@ static inline int epilogue_offset(const struct jit_ctx *ctx) /* Stack must be multiples of 16B */ #define STACK_ALIGN(sz) (((sz) + 15) & ~15) -#define _STACK_SIZE \ - (MAX_BPF_STACK \ - + 4 /* extra for skb_copy_bits buffer */) - -#define STACK_SIZE STACK_ALIGN(_STACK_SIZE) - #define PROLOGUE_OFFSET 8 static int build_prologue(struct jit_ctx *ctx) { + const struct bpf_prog *prog = ctx->prog; const u8 r6 = bpf2a64[BPF_REG_6]; const u8 r7 = bpf2a64[BPF_REG_7]; const u8 r8 = bpf2a64[BPF_REG_8]; @@ -178,9 +174,9 @@ static int build_prologue(struct jit_ctx *ctx) * | | * | ... | BPF prog stack * | | - * +-----+ <= (BPF_FP - MAX_BPF_STACK) + * +-----+ <= (BPF_FP - prog->aux->stack_depth) * |RSVD | JIT scratchpad - * current A64_SP => +-----+ <= (BPF_FP - STACK_SIZE) + * current A64_SP => +-----+ <= (BPF_FP - ctx->stack_size) * | | * | ... | Function call stack * | | @@ -204,8 +200,12 @@ static int build_prologue(struct jit_ctx *ctx) /* Initialize tail_call_cnt */ emit(A64_MOVZ(1, tcc, 0, 0), ctx); + /* 4 byte extra for skb_copy_bits buffer */ + ctx->stack_size = prog->aux->stack_depth + 4; + ctx->stack_size = STACK_ALIGN(ctx->stack_size); + /* Set up function call stack */ - emit(A64_SUB_I(1, A64_SP, A64_SP, STACK_SIZE), ctx); + emit(A64_SUB_I(1, A64_SP, A64_SP, ctx->stack_size), ctx); cur_offset = ctx->idx - idx0; if (cur_offset != PROLOGUE_OFFSET) { @@ -290,7 +290,7 @@ static void build_epilogue(struct jit_ctx *ctx) const u8 fp = bpf2a64[BPF_REG_FP]; /* We're done with BPF stack */ - emit(A64_ADD_I(1, A64_SP, A64_SP, STACK_SIZE), ctx); + emit(A64_ADD_I(1, A64_SP, A64_SP, ctx->stack_size), ctx); /* Restore fs (x25) and x26 */ emit(A64_POP(fp, A64_R(26), A64_SP), ctx); @@ -589,7 +589,7 @@ emit_cond_jmp: break; } /* tail call */ - case BPF_JMP | BPF_CALL | BPF_X: + case BPF_JMP | BPF_TAIL_CALL: if (emit_bpf_tail_call(ctx)) return -EFAULT; break; @@ -735,7 +735,7 @@ emit_cond_jmp: return -EINVAL; } emit_a64_mov_i64(r3, size, ctx); - emit(A64_SUB_I(1, r4, fp, STACK_SIZE), ctx); + emit(A64_SUB_I(1, r4, fp, ctx->stack_size), ctx); emit_a64_mov_i64(r5, (unsigned long)bpf_load_pointer, ctx); emit(A64_BLR(r5), ctx); emit(A64_MOV(1, r0, A64_R(0)), ctx); @@ -903,6 +903,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog) bpf_jit_binary_lock_ro(header); prog->bpf_func = (void *)ctx.image; prog->jited = 1; + prog->jited_len = image_size; out_off: kfree(ctx.offset); |