ack/mach/powerpc/as/mach5.c

quad emit_ha(struct expr_t* expr, bool is_signed)
{
    /* If this is a symbol reference, discard the symbol and keep only the
        * offset part. */
    quad type = expr->typ & S_TYP;
    quad val = expr->val;
    uint16_t hi = val >> 16;
    uint16_t lo = val & 0xffff;

    if (type != S_ABS)
		newrelo(expr->typ, RELOPPC | FIXUPFLAGS);

    /* If the low half of this relocation is going to be a memory operation,
     * then it'll be treated as a signed value. That means that values greater
     * than 0x7fff will cause the high word to have 1 subtracted from it; so
     * we apply an adjustment here.
     */

    if (is_signed && (lo > 0x7fff))
        hi++;

    return hi;
}

quad emit_lo(struct expr_t* expr)
{
    quad type = expr->typ & S_TYP;
    quad val = expr->val;

    /* If the assembler stored a symbol for relocation later, we need to
     * abandon it (because the relocation was generated by emit_ha). */

    if (type != S_ABS)
        relonami = 0;

    return val & 0xffff;
}