avr_op_decoder.jinja

/* Autogenerated file, do not edit */

#include <stdint.h>
#include <stdbool.h>
#include "avr_op_decoder.h"

{% macro unpack_operand(op_spec) %}
    {% for run in op_spec %}
{{ '((opcode & 0x%04x) >> %d)' % (run.mask, run.rshift) }}{% if not loop.last %} | {% endif %}
    {%- endfor %}
{% endmacro %}
static const char *instr_names[] =
{
    "undefined",
{% for opcode in oplist %}
    "{{ opcode.instr }}",
{% endfor %}
};

//--- instruction name getters
const char *avr_get_instr_name_by_id(avr_instr_t id)
{
    if (id < {{ oplist|length + 1 }})
        return instr_names[id];
    return "?";
}

//--- instruction decoders
static void decode_undefined(avr_operands_t *result, uint16_t opcode)
{
}

{% for opcode in oplist %}
static void decode_{{ opcode.instr }}(avr_operands_t *result, uint16_t opcode)
{
    {% for op in opcode.operands %}
        {% set var = operand_map[op] %}
    result->{{ var }} = {{ unpack_operand(opcode.unpackers[op]) }};
        {% if op == 'l' %}
    result->{{ var }} = ((int) result->{{ var }} << 25) >> 25;
        {% elif op == 'L' %}
    result->{{ var }} = ((int) result->{{ var }} << 20) >> 20;
        {% elif op == 'R' or op == 'D' %}
    result->{{ var }} += 16;
        {% elif op == 'w' %}
    result->{{ var }} += 12;
        {% endif %}
    {% endfor %}
}

{% endfor %}

//--- instruction matcher
avr_instr_t avr_decode(avr_operands_t *result, uint16_t op)
{
    static void (* const unpackers[{{ oplist|length + 1 }}])(avr_operands_t *, uint16_t) =
    {
        decode_undefined,
{% for rows in oplist|batch(8) %}
        {%+ for opcode in rows %}decode_{{ opcode.instr }}, {% endfor %}

{% endfor %}
    };

    static const uint8_t lut0[{{ lut0|length }}] =
    {
{% for rows in lut0|dictsort|batch(16) %}
        {%+ for i, hash_idx in rows %}{{ hash_idx }}, {% endfor %}

{% endfor %}
    };

    static const uint8_t lut1[{{ lut1|length }}][{{ lut1[0]|length }}] =
    {
{% for idx0, hash in lut1|dictsort %}
        { {% for idx1, instr in hash|dictsort %}{{ instr }}{% if not loop.last %}, {% endif -%}{% endfor %}},
{% endfor %}
    };

    int hash = lut0[op >> {{ 16 - nmsbits }}];
    int instr = lut1[hash][op & {{ '0x%X' % (2 ** (16 - nmsbits) - 1) }}];
    if (result)
        unpackers[instr](result, op);
    return instr;
}