MIPS_R_T5
[BPF_REG_5] = {MIPS_R_T5, MIPS_R_T4},
BIT(MIPS_R_T5))
emit_sext(ctx, MIPS_R_T5, src);
emit_cmpxchg_r(ctx, dst, MIPS_R_T5, tmp, off);
emit_sext(ctx, MIPS_R_T5, src); /* Sign-extended src */
emit_jmp_r(ctx, MIPS_R_T4, MIPS_R_T5, rel, jmp);
emit_mov_i(ctx, MIPS_R_T5, imm);
emit_jmp_r(ctx, MIPS_R_T4, MIPS_R_T5, rel, jmp);