static int emit_store_r64()

in net/bpf_jit_comp32.c [873:913]

• 37 lines of code
• 9 McCabe index (conditional complexity)

static int emit_store_r64(const s8 *dst, const s8 *src, s16 off,
			  struct rv_jit_context *ctx, const u8 size,
			  const u8 mode)
{
	const s8 *tmp1 = bpf2rv32[TMP_REG_1];
	const s8 *tmp2 = bpf2rv32[TMP_REG_2];
	const s8 *rd = bpf_get_reg64(dst, tmp1, ctx);
	const s8 *rs = bpf_get_reg64(src, tmp2, ctx);

	if (mode == BPF_ATOMIC && size != BPF_W)
		return -1;

	emit_imm(RV_REG_T0, off, ctx);
	emit(rv_add(RV_REG_T0, RV_REG_T0, lo(rd)), ctx);

	switch (size) {
	case BPF_B:
		emit(rv_sb(RV_REG_T0, 0, lo(rs)), ctx);
		break;
	case BPF_H:
		emit(rv_sh(RV_REG_T0, 0, lo(rs)), ctx);
		break;
	case BPF_W:
		switch (mode) {
		case BPF_MEM:
			emit(rv_sw(RV_REG_T0, 0, lo(rs)), ctx);
			break;
		case BPF_ATOMIC: /* Only BPF_ADD supported */
			emit(rv_amoadd_w(RV_REG_ZERO, lo(rs), RV_REG_T0, 0, 0),
			     ctx);
			break;
		}
		break;
	case BPF_DW:
		emit(rv_sw(RV_REG_T0, 0, lo(rs)), ctx);
		emit(rv_sw(RV_REG_T0, 4, hi(rs)), ctx);
		break;
	}

	return 0;
}