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bpf, mips64: 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 mips64 JIT.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Daney <david.daney@cavium.com>
Reviewed-by: David Daney <david.daney@cavium.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
hifive-unleashed-5.1
Daniel Borkmann 2018-01-26 23:33:45 +01:00 committed by Alexei Starovoitov
parent 740d52c646
commit 1fb5c9c622
1 changed files with 0 additions and 10 deletions
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10
arch/mips/net/ebpf_jit.c
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@ -860,11 +860,6 @@ static int build_one_insn(const struct bpf_insn *insn, struct jit_ctx *ctx,
break;
case BPF_DIV:
case BPF_MOD:
b_off = b_imm(exit_idx, ctx);
if (is_bad_offset(b_off))
return -E2BIG;
emit_instr(ctx, beq, src, MIPS_R_ZERO, b_off);
emit_instr(ctx, movz, MIPS_R_V0, MIPS_R_ZERO, src);
emit_instr(ctx, ddivu, dst, src);
if (bpf_op == BPF_DIV)
emit_instr(ctx, mflo, dst);
@ -943,11 +938,6 @@ static int build_one_insn(const struct bpf_insn *insn, struct jit_ctx *ctx,
break;
case BPF_DIV:
case BPF_MOD:
b_off = b_imm(exit_idx, ctx);
if (is_bad_offset(b_off))
return -E2BIG;
emit_instr(ctx, beq, src, MIPS_R_ZERO, b_off);
emit_instr(ctx, movz, MIPS_R_V0, MIPS_R_ZERO, src);
emit_instr(ctx, divu, dst, src);
if (bpf_op == BPF_DIV)
emit_instr(ctx, mflo, dst);