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Diffstat (limited to 'arch/sparc/net/bpf_jit_comp_64.c')
-rw-r--r--arch/sparc/net/bpf_jit_comp_64.c80
1 files changed, 2 insertions, 78 deletions
diff --git a/arch/sparc/net/bpf_jit_comp_64.c b/arch/sparc/net/bpf_jit_comp_64.c
index 48a25869349b..222785af550b 100644
--- a/arch/sparc/net/bpf_jit_comp_64.c
+++ b/arch/sparc/net/bpf_jit_comp_64.c
@@ -48,10 +48,6 @@ static void bpf_flush_icache(void *start_, void *end_)
}
}
-#define SEEN_DATAREF 1 /* might call external helpers */
-#define SEEN_XREG 2 /* ebx is used */
-#define SEEN_MEM 4 /* use mem[] for temporary storage */
-
#define S13(X) ((X) & 0x1fff)
#define S5(X) ((X) & 0x1f)
#define IMMED 0x00002000
@@ -198,7 +194,6 @@ struct jit_ctx {
bool tmp_1_used;
bool tmp_2_used;
bool tmp_3_used;
- bool saw_ld_abs_ind;
bool saw_frame_pointer;
bool saw_call;
bool saw_tail_call;
@@ -207,9 +202,7 @@ struct jit_ctx {
#define TMP_REG_1 (MAX_BPF_JIT_REG + 0)
#define TMP_REG_2 (MAX_BPF_JIT_REG + 1)
-#define SKB_HLEN_REG (MAX_BPF_JIT_REG + 2)
-#define SKB_DATA_REG (MAX_BPF_JIT_REG + 3)
-#define TMP_REG_3 (MAX_BPF_JIT_REG + 4)
+#define TMP_REG_3 (MAX_BPF_JIT_REG + 2)
/* Map BPF registers to SPARC registers */
static const int bpf2sparc[] = {
@@ -238,9 +231,6 @@ static const int bpf2sparc[] = {
[TMP_REG_1] = G1,
[TMP_REG_2] = G2,
[TMP_REG_3] = G3,
-
- [SKB_HLEN_REG] = L4,
- [SKB_DATA_REG] = L5,
};
static void emit(const u32 insn, struct jit_ctx *ctx)
@@ -800,25 +790,6 @@ static int emit_compare_and_branch(const u8 code, const u8 dst, u8 src,
return 0;
}
-static void load_skb_regs(struct jit_ctx *ctx, u8 r_skb)
-{
- const u8 r_headlen = bpf2sparc[SKB_HLEN_REG];
- const u8 r_data = bpf2sparc[SKB_DATA_REG];
- const u8 r_tmp = bpf2sparc[TMP_REG_1];
- unsigned int off;
-
- off = offsetof(struct sk_buff, len);
- emit(LD32I | RS1(r_skb) | S13(off) | RD(r_headlen), ctx);
-
- off = offsetof(struct sk_buff, data_len);
- emit(LD32I | RS1(r_skb) | S13(off) | RD(r_tmp), ctx);
-
- emit(SUB | RS1(r_headlen) | RS2(r_tmp) | RD(r_headlen), ctx);
-
- off = offsetof(struct sk_buff, data);
- emit(LDPTRI | RS1(r_skb) | S13(off) | RD(r_data), ctx);
-}
-
/* Just skip the save instruction and the ctx register move. */
#define BPF_TAILCALL_PROLOGUE_SKIP 16
#define BPF_TAILCALL_CNT_SP_OFF (STACK_BIAS + 128)
@@ -857,9 +828,6 @@ static void build_prologue(struct jit_ctx *ctx)
emit_reg_move(I0, O0, ctx);
/* If you add anything here, adjust BPF_TAILCALL_PROLOGUE_SKIP above. */
-
- if (ctx->saw_ld_abs_ind)
- load_skb_regs(ctx, bpf2sparc[BPF_REG_1]);
}
static void build_epilogue(struct jit_ctx *ctx)
@@ -926,7 +894,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
const int i = insn - ctx->prog->insnsi;
const s16 off = insn->off;
const s32 imm = insn->imm;
- u32 *func;
if (insn->src_reg == BPF_REG_FP)
ctx->saw_frame_pointer = true;
@@ -1225,16 +1192,11 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
u8 *func = ((u8 *)__bpf_call_base) + imm;
ctx->saw_call = true;
- if (ctx->saw_ld_abs_ind && bpf_helper_changes_pkt_data(func))
- emit_reg_move(bpf2sparc[BPF_REG_1], L7, ctx);
emit_call((u32 *)func, ctx);
emit_nop(ctx);
emit_reg_move(O0, bpf2sparc[BPF_REG_0], ctx);
-
- if (ctx->saw_ld_abs_ind && bpf_helper_changes_pkt_data(func))
- load_skb_regs(ctx, L7);
break;
}
@@ -1412,43 +1374,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
emit_nop(ctx);
break;
}
-#define CHOOSE_LOAD_FUNC(K, func) \
- ((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative_offset : func) : func##_positive_offset)
-
- /* R0 = ntohx(*(size *)(((struct sk_buff *)R6)->data + imm)) */
- case BPF_LD | BPF_ABS | BPF_W:
- func = CHOOSE_LOAD_FUNC(imm, bpf_jit_load_word);
- goto common_load;
- case BPF_LD | BPF_ABS | BPF_H:
- func = CHOOSE_LOAD_FUNC(imm, bpf_jit_load_half);
- goto common_load;
- case BPF_LD | BPF_ABS | BPF_B:
- func = CHOOSE_LOAD_FUNC(imm, bpf_jit_load_byte);
- goto common_load;
- /* R0 = ntohx(*(size *)(((struct sk_buff *)R6)->data + src + imm)) */
- case BPF_LD | BPF_IND | BPF_W:
- func = bpf_jit_load_word;
- goto common_load;
- case BPF_LD | BPF_IND | BPF_H:
- func = bpf_jit_load_half;
- goto common_load;
-
- case BPF_LD | BPF_IND | BPF_B:
- func = bpf_jit_load_byte;
- common_load:
- ctx->saw_ld_abs_ind = true;
-
- emit_reg_move(bpf2sparc[BPF_REG_6], O0, ctx);
- emit_loadimm(imm, O1, ctx);
-
- if (BPF_MODE(code) == BPF_IND)
- emit_alu(ADD, src, O1, ctx);
-
- emit_call(func, ctx);
- emit_alu_K(SRA, O1, 0, ctx);
-
- emit_reg_move(O0, bpf2sparc[BPF_REG_0], ctx);
- break;
default:
pr_err_once("unknown opcode %02x\n", code);
@@ -1583,12 +1508,11 @@ skip_init_ctx:
build_epilogue(&ctx);
if (bpf_jit_enable > 1)
- pr_info("Pass %d: shrink = %d, seen = [%c%c%c%c%c%c%c]\n", pass,
+ pr_info("Pass %d: shrink = %d, seen = [%c%c%c%c%c%c]\n", pass,
image_size - (ctx.idx * 4),
ctx.tmp_1_used ? '1' : ' ',
ctx.tmp_2_used ? '2' : ' ',
ctx.tmp_3_used ? '3' : ' ',
- ctx.saw_ld_abs_ind ? 'L' : ' ',
ctx.saw_frame_pointer ? 'F' : ' ',
ctx.saw_call ? 'C' : ' ',
ctx.saw_tail_call ? 'T' : ' ');