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Commit 2e46477a authored by Denis Kirjanov's avatar Denis Kirjanov Committed by David S. Miller
Browse files

mips: bpf: Fix broken BPF_MOD 



Remove optimize_div() from BPF_MOD | BPF_K case
since we don't know the dividend and fix the
emit_mod() by reading the mod operation result from HI register

Signed-off-by: default avatarDenis Kirjanov <kda@linux-powerpc.org>
Reviewed-by: default avatarMarkos Chandras <markos.chandras@imgtec.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f2a01517

arch/mips/net/bpf_jit.c

+2 −2
Original line number Diff line number Diff line
@@ -426,7 +426,7 @@ static inline void emit_mod(unsigned int dst, unsigned int src, 
		u32 *p = &ctx->target[ctx->idx];

		uasm_i_divu(&p, dst, src);

		p = &ctx->target[ctx->idx + 1];

		uasm_i_mflo(&p, dst);

		uasm_i_mfhi(&p, dst);

	}

	ctx->idx += 2; /* 2 insts */

}
@@ -971,7 +971,7 @@ static int build_body(struct jit_ctx *ctx) 
			break;

		case BPF_ALU | BPF_MOD | BPF_K:

			/* A %= k */

			if (k == 1 || optimize_div(&k)) {

			if (k == 1) {

				ctx->flags |= SEEN_A;

				emit_jit_reg_move(r_A, r_zero, ctx);

			} else {