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bpf, sparc64: remove obsolete exception handling from div/mod 

Since we've changed div/mod exception handling for src_reg in
eBPF verifier itself, remove the leftovers from sparc64 JIT.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann 2018-01-26 23:33:44 +01:00 committed by Alexei Starovoitov
parent 53fbf5719a
commit 740d52c646
1 changed files with 0 additions and 18 deletions
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18
arch/sparc/net/bpf_jit_comp_64.c
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@ -967,31 +967,17 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
emit_alu(MULX, src, dst, ctx);
break;
case BPF_ALU | BPF_DIV | BPF_X:
emit_cmp(src, G0, ctx);
emit_branch(BE|ANNUL, ctx->idx, ctx->epilogue_offset, ctx);
emit_loadimm(0, bpf2sparc[BPF_REG_0], ctx);
emit_write_y(G0, ctx);
emit_alu(DIV, src, dst, ctx);
break;
case BPF_ALU64 | BPF_DIV | BPF_X:
emit_cmp(src, G0, ctx);
emit_branch(BE|ANNUL, ctx->idx, ctx->epilogue_offset, ctx);
emit_loadimm(0, bpf2sparc[BPF_REG_0], ctx);
emit_alu(UDIVX, src, dst, ctx);
break;
case BPF_ALU | BPF_MOD | BPF_X: {
const u8 tmp = bpf2sparc[TMP_REG_1];
ctx->tmp_1_used = true;
emit_cmp(src, G0, ctx);
emit_branch(BE|ANNUL, ctx->idx, ctx->epilogue_offset, ctx);
emit_loadimm(0, bpf2sparc[BPF_REG_0], ctx);
emit_write_y(G0, ctx);
emit_alu3(DIV, dst, src, tmp, ctx);
emit_alu3(MULX, tmp, src, tmp, ctx);
@ -1003,10 +989,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
ctx->tmp_1_used = true;
emit_cmp(src, G0, ctx);
emit_branch(BE|ANNUL, ctx->idx, ctx->epilogue_offset, ctx);
emit_loadimm(0, bpf2sparc[BPF_REG_0], ctx);
emit_alu3(UDIVX, dst, src, tmp, ctx);
emit_alu3(MULX, tmp, src, tmp, ctx);
emit_alu3(SUB, dst, tmp, dst, ctx);