emitinlinethumb.c 31.8 KB
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/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

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#include <stdint.h>
#include <stdio.h>
#include <string.h>
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#include <stdarg.h>
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#include <assert.h>

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#include "py/emit.h"
#include "py/asmthumb.h"
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#if MICROPY_EMIT_INLINE_THUMB
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typedef enum {
#define DEF_RULE(rule, comp, kind, ...) PN_##rule,
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#include "py/grammar.h"
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#undef DEF_RULE
    PN_maximum_number_of,
} pn_kind_t;

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struct _emit_inline_asm_t {
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    uint16_t pass;
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    scope_t *scope;
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    mp_obj_t *error_slot;
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    mp_uint_t max_num_labels;
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    qstr *label_lookup;
    asm_thumb_t *as;
};

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STATIC void emit_inline_thumb_error_msg(emit_inline_asm_t *emit, const char *msg) {
    *emit->error_slot = mp_obj_new_exception_msg(&mp_type_SyntaxError, msg);
}

STATIC void emit_inline_thumb_error_exc(emit_inline_asm_t *emit, mp_obj_t exc) {
    *emit->error_slot = exc;
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}

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emit_inline_asm_t *emit_inline_thumb_new(mp_uint_t max_num_labels) {
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    emit_inline_asm_t *emit = m_new_obj(emit_inline_asm_t);
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    emit->max_num_labels = max_num_labels;
    emit->label_lookup = m_new(qstr, max_num_labels);
    emit->as = asm_thumb_new(max_num_labels);
    return emit;
}

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void emit_inline_thumb_free(emit_inline_asm_t *emit) {
    m_del(qstr, emit->label_lookup, emit->max_num_labels);
    asm_thumb_free(emit->as, false);
    m_del_obj(emit_inline_asm_t, emit);
}

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STATIC void emit_inline_thumb_start_pass(emit_inline_asm_t *emit, pass_kind_t pass, scope_t *scope, mp_obj_t *error_slot) {
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    emit->pass = pass;
    emit->scope = scope;
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    emit->error_slot = error_slot;
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    if (emit->pass == MP_PASS_CODE_SIZE) {
        memset(emit->label_lookup, 0, emit->max_num_labels * sizeof(qstr));
    }
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    asm_thumb_start_pass(emit->as, pass == MP_PASS_EMIT ? ASM_THUMB_PASS_EMIT : ASM_THUMB_PASS_COMPUTE);
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    asm_thumb_entry(emit->as, 0);
}

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STATIC void emit_inline_thumb_end_pass(emit_inline_asm_t *emit) {
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    asm_thumb_exit(emit->as);
    asm_thumb_end_pass(emit->as);

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    if (emit->pass == MP_PASS_EMIT) {
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        void *f = asm_thumb_get_code(emit->as);
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        mp_emit_glue_assign_native(emit->scope->raw_code, MP_CODE_NATIVE_ASM, f, asm_thumb_get_code_size(emit->as), emit->scope->num_pos_args, 0, 0, 0);
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    }
}

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STATIC mp_uint_t emit_inline_thumb_count_params(emit_inline_asm_t *emit, mp_uint_t n_params, mp_parse_node_t *pn_params) {
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    if (n_params > 4) {
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        emit_inline_thumb_error_msg(emit, "can only have up to 4 parameters to Thumb assembly");
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        return 0;
    }
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    for (mp_uint_t i = 0; i < n_params; i++) {
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        if (!MP_PARSE_NODE_IS_ID(pn_params[i])) {
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            emit_inline_thumb_error_msg(emit, "parameters must be registers in sequence r0 to r3");
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            return 0;
        }
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        const char *p = qstr_str(MP_PARSE_NODE_LEAF_ARG(pn_params[i]));
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        if (!(strlen(p) == 2 && p[0] == 'r' && p[1] == '0' + i)) {
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            emit_inline_thumb_error_msg(emit, "parameters must be registers in sequence r0 to r3");
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            return 0;
        }
    }
    return n_params;
}

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STATIC bool emit_inline_thumb_label(emit_inline_asm_t *emit, mp_uint_t label_num, qstr label_id) {
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    assert(label_num < emit->max_num_labels);
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    if (emit->pass == MP_PASS_CODE_SIZE) {
        // check for duplicate label on first pass
        for (int i = 0; i < emit->max_num_labels; i++) {
            if (emit->label_lookup[i] == label_id) {
                return false;
            }
        }
    }
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    emit->label_lookup[label_num] = label_id;
    asm_thumb_label_assign(emit->as, label_num);
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    return true;
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}

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STATIC void emit_inline_thumb_align(emit_inline_asm_t *emit, mp_uint_t align) {
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    asm_thumb_align(emit->as, align);
}

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STATIC void emit_inline_thumb_data(emit_inline_asm_t *emit, mp_uint_t bytesize, mp_uint_t val) {
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    asm_thumb_data(emit->as, bytesize, val);
}

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typedef struct _reg_name_t { byte reg; byte name[3]; } reg_name_t;
STATIC const reg_name_t reg_name_table[] = {
    {0, "r0\0"},
    {1, "r1\0"},
    {2, "r2\0"},
    {3, "r3\0"},
    {4, "r4\0"},
    {5, "r5\0"},
    {6, "r6\0"},
    {7, "r7\0"},
    {8, "r8\0"},
    {9, "r9\0"},
    {10, "r10"},
    {11, "r11"},
    {12, "r12"},
    {13, "r13"},
    {14, "r14"},
    {15, "r15"},
    {10, "sl\0"},
    {11, "fp\0"},
    {13, "sp\0"},
    {14, "lr\0"},
    {15, "pc\0"},
};

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// return empty string in case of error, so we can attempt to parse the string
// without a special check if it was in fact a string
STATIC const char *get_arg_str(mp_parse_node_t pn) {
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    if (MP_PARSE_NODE_IS_ID(pn)) {
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        qstr qst = MP_PARSE_NODE_LEAF_ARG(pn);
        return qstr_str(qst);
    } else {
        return "";
    }
}

STATIC mp_uint_t get_arg_reg(emit_inline_asm_t *emit, const char *op, mp_parse_node_t pn, mp_uint_t max_reg) {
    const char *reg_str = get_arg_str(pn);
    for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(reg_name_table); i++) {
        const reg_name_t *r = &reg_name_table[i];
        if (reg_str[0] == r->name[0]
            && reg_str[1] == r->name[1]
            && reg_str[2] == r->name[2]
            && (reg_str[2] == '\0' || reg_str[3] == '\0')) {
            if (r->reg > max_reg) {
                emit_inline_thumb_error_exc(emit,
                    mp_obj_new_exception_msg_varg(&mp_type_SyntaxError,
                        "'%s' expects at most r%d", op, max_reg));
                return 0;
            } else {
                return r->reg;
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            }
        }
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    }
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    emit_inline_thumb_error_exc(emit,
        mp_obj_new_exception_msg_varg(&mp_type_SyntaxError,
            "'%s' expects a register", op));
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    return 0;
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}

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#if MICROPY_EMIT_INLINE_THUMB_FLOAT
STATIC mp_uint_t get_arg_vfpreg(emit_inline_asm_t *emit, const char *op, mp_parse_node_t pn) {
    const char *reg_str = get_arg_str(pn);
    if (reg_str[0] == 's' && reg_str[1] != '\0') {
        mp_uint_t regno = 0;
        for (++reg_str; *reg_str; ++reg_str) {
            mp_uint_t v = *reg_str;
            if (!('0' <= v && v <= '9')) {
                goto malformed;
            }
            regno = 10 * regno + v - '0';
        }
        if (regno > 31) {
            emit_inline_thumb_error_exc(emit,
                 mp_obj_new_exception_msg_varg(&mp_type_SyntaxError,
                       "'%s' expects at most r%d", op, 31));
            return 0;
        } else {
            return regno;
        }
    }
malformed:
    emit_inline_thumb_error_exc(emit,
         mp_obj_new_exception_msg_varg(&mp_type_SyntaxError,
            "'%s' expects an FPU register", op));
    return 0;
}
#endif

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STATIC mp_uint_t get_arg_reglist(emit_inline_asm_t *emit, const char *op, mp_parse_node_t pn) {
    // a register list looks like {r0, r1, r2} and is parsed as a Python set

    if (!MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_atom_brace)) {
        goto bad_arg;
    }

    mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
    assert(MP_PARSE_NODE_STRUCT_NUM_NODES(pns) == 1); // should always be
    pn = pns->nodes[0];

    mp_uint_t reglist = 0;

    if (MP_PARSE_NODE_IS_ID(pn)) {
        // set with one element
        reglist |= 1 << get_arg_reg(emit, op, pn, 15);
    } else if (MP_PARSE_NODE_IS_STRUCT(pn)) {
        pns = (mp_parse_node_struct_t*)pn;
        if (MP_PARSE_NODE_STRUCT_KIND(pns) == PN_dictorsetmaker) {
            assert(MP_PARSE_NODE_IS_STRUCT(pns->nodes[1])); // should succeed
            mp_parse_node_struct_t *pns1 = (mp_parse_node_struct_t*)pns->nodes[1];
            if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_dictorsetmaker_list) {
                // set with multiple elements

                // get first element of set (we rely on get_arg_reg to catch syntax errors)
                reglist |= 1 << get_arg_reg(emit, op, pns->nodes[0], 15);

                // get tail elements (2nd, 3rd, ...)
                mp_parse_node_t *nodes;
                int n = mp_parse_node_extract_list(&pns1->nodes[0], PN_dictorsetmaker_list2, &nodes);

                // process rest of elements
                for (int i = 0; i < n; i++) {
                    reglist |= 1 << get_arg_reg(emit, op, nodes[i], 15);
                }
            } else {
                goto bad_arg;
            }
        } else {
            goto bad_arg;
        }
    } else {
        goto bad_arg;
    }

    return reglist;

bad_arg:
    emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "'%s' expects {r0, r1, ...}", op));
    return 0;
}

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STATIC int get_arg_i(emit_inline_asm_t *emit, const char *op, mp_parse_node_t pn, int fit_mask) {
    if (!MP_PARSE_NODE_IS_SMALL_INT(pn)) {
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        emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "'%s' expects an integer", op));
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        return 0;
    }
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    int i = MP_PARSE_NODE_LEAF_SMALL_INT(pn);
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    if ((i & (~fit_mask)) != 0) {
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        emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "'%s' integer 0x%x does not fit in mask 0x%x", op, i, fit_mask));
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        return 0;
    }
    return i;
}

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STATIC bool get_arg_addr(emit_inline_asm_t *emit, const char *op, mp_parse_node_t pn, mp_parse_node_t *pn_base, mp_parse_node_t *pn_offset) {
    if (!MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_atom_bracket)) {
        goto bad_arg;
    }
    mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
    if (!MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_testlist_comp)) {
        goto bad_arg;
    }
    pns = (mp_parse_node_struct_t*)pns->nodes[0];
    if (MP_PARSE_NODE_STRUCT_NUM_NODES(pns) != 2) {
        goto bad_arg;
    }

    *pn_base = pns->nodes[0];
    *pn_offset = pns->nodes[1];
    return true;

bad_arg:
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    emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "'%s' expects an address of the form [a, b]", op));
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    return false;
}

STATIC int get_arg_label(emit_inline_asm_t *emit, const char *op, mp_parse_node_t pn) {
    if (!MP_PARSE_NODE_IS_ID(pn)) {
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        emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "'%s' expects a label", op));
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        return 0;
    }
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    qstr label_qstr = MP_PARSE_NODE_LEAF_ARG(pn);
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    for (int i = 0; i < emit->max_num_labels; i++) {
        if (emit->label_lookup[i] == label_qstr) {
            return i;
        }
    }
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    // only need to have the labels on the last pass
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    if (emit->pass == MP_PASS_EMIT) {
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        emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "label '%q' not defined", label_qstr));
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    }
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    return 0;
}

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typedef struct _cc_name_t { byte cc; byte name[2]; } cc_name_t;
STATIC const cc_name_t cc_name_table[] = {
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    { ASM_THUMB_CC_EQ, "eq" },
    { ASM_THUMB_CC_NE, "ne" },
    { ASM_THUMB_CC_CS, "cs" },
    { ASM_THUMB_CC_CC, "cc" },
    { ASM_THUMB_CC_MI, "mi" },
    { ASM_THUMB_CC_PL, "pl" },
    { ASM_THUMB_CC_VS, "vs" },
    { ASM_THUMB_CC_VC, "vc" },
    { ASM_THUMB_CC_HI, "hi" },
    { ASM_THUMB_CC_LS, "ls" },
    { ASM_THUMB_CC_GE, "ge" },
    { ASM_THUMB_CC_LT, "lt" },
    { ASM_THUMB_CC_GT, "gt" },
    { ASM_THUMB_CC_LE, "le" },
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};

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typedef struct _format_4_op_t { byte op; char name[3]; } format_4_op_t;
#define X(x) (((x) >> 4) & 0xff) // only need 1 byte to distinguish these ops
STATIC const format_4_op_t format_4_op_table[] = {
    { X(ASM_THUMB_FORMAT_4_EOR), "eor" },
    { X(ASM_THUMB_FORMAT_4_LSL), "lsl" },
    { X(ASM_THUMB_FORMAT_4_LSR), "lsr" },
    { X(ASM_THUMB_FORMAT_4_ASR), "asr" },
    { X(ASM_THUMB_FORMAT_4_ADC), "adc" },
    { X(ASM_THUMB_FORMAT_4_SBC), "sbc" },
    { X(ASM_THUMB_FORMAT_4_ROR), "ror" },
    { X(ASM_THUMB_FORMAT_4_TST), "tst" },
    { X(ASM_THUMB_FORMAT_4_NEG), "neg" },
    { X(ASM_THUMB_FORMAT_4_CMP), "cmp" },
    { X(ASM_THUMB_FORMAT_4_CMN), "cmn" },
    { X(ASM_THUMB_FORMAT_4_ORR), "orr" },
    { X(ASM_THUMB_FORMAT_4_MUL), "mul" },
    { X(ASM_THUMB_FORMAT_4_BIC), "bic" },
    { X(ASM_THUMB_FORMAT_4_MVN), "mvn" },
};
#undef X

typedef struct _format_9_10_op_t { uint16_t op; char name[5]; } format_9_10_op_t;
#define X(x) (x)
STATIC const format_9_10_op_t format_9_10_op_table[] = {
    { X(ASM_THUMB_FORMAT_9_LDR | ASM_THUMB_FORMAT_9_WORD_TRANSFER), "ldr" },
    { X(ASM_THUMB_FORMAT_9_LDR | ASM_THUMB_FORMAT_9_BYTE_TRANSFER), "ldrb" },
    { X(ASM_THUMB_FORMAT_10_LDRH), "ldrh" },
    { X(ASM_THUMB_FORMAT_9_STR | ASM_THUMB_FORMAT_9_WORD_TRANSFER), "str" },
    { X(ASM_THUMB_FORMAT_9_STR | ASM_THUMB_FORMAT_9_BYTE_TRANSFER), "strb" },
    { X(ASM_THUMB_FORMAT_10_STRH), "strh" },
};
#undef X

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#if MICROPY_EMIT_INLINE_THUMB_FLOAT
// actual opcodes are: 0xee00 | op.hi_nibble, 0x0a00 | op.lo_nibble
typedef struct _format_vfp_op_t { byte op; char name[3]; } format_vfp_op_t;
STATIC const format_vfp_op_t format_vfp_op_table[] = {
    { 0x30, "add" },
    { 0x34, "sub" },
    { 0x20, "mul" },
    { 0x80, "div" },
};
#endif

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// shorthand alias for whether we allow ARMv7-M instructions
#define ARMV7M MICROPY_EMIT_INLINE_THUMB_ARMV7M

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STATIC void emit_inline_thumb_op(emit_inline_asm_t *emit, qstr op, mp_uint_t n_args, mp_parse_node_t *pn_args) {
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    // TODO perhaps make two tables:
Damien's avatar
Damien committed
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    // one_args =
    // "b", LAB, asm_thumb_b_n,
    // "bgt", LAB, asm_thumb_bgt_n,
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    // two_args =
    // "movs", RLO, I8, asm_thumb_movs_reg_i8
    // "movw", REG, REG, asm_thumb_movw_reg_i16
    // three_args =
    // "subs", RLO, RLO, I3, asm_thumb_subs_reg_reg_i3

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    mp_uint_t op_len;
    const char *op_str = (const char*)qstr_data(op, &op_len);
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    #if MICROPY_EMIT_INLINE_THUMB_FLOAT
    if (op_str[0] == 'v') {
        // floating point operations
        if (n_args == 2) {
            mp_uint_t op_code = 0x0ac0, op_code_hi;
            if (strcmp(op_str, "vcmp") == 0) {
                op_code_hi = 0xeeb4;
                op_vfp_twoargs:;
                mp_uint_t vd = get_arg_vfpreg(emit, op_str, pn_args[0]);
                mp_uint_t vm = get_arg_vfpreg(emit, op_str, pn_args[1]);
                asm_thumb_op32(emit->as,
                    op_code_hi | ((vd & 1) << 6),
                    op_code | ((vd & 0x1e) << 11) | ((vm & 1) << 5) | (vm & 0x1e) >> 1);
            } else if (strcmp(op_str, "vsqrt") == 0) {
                op_code_hi = 0xeeb1;
                goto op_vfp_twoargs;
            } else if (strcmp(op_str, "vneg") == 0) {
                op_code_hi = 0xeeb1;
                op_code = 0x0a40;
                goto op_vfp_twoargs;
            } else if (strcmp(op_str, "vcvt_f32_s32") == 0) {
                op_code_hi = 0xeeb8; // int to float
                goto op_vfp_twoargs;
            } else if (strcmp(op_str, "vcvt_s32_f32") == 0) {
                op_code_hi = 0xeebd; // float to int
                goto op_vfp_twoargs;
            } else if (strcmp(op_str, "vmrs") == 0) {
                mp_uint_t reg_dest;
                const char *reg_str0 = get_arg_str(pn_args[0]);
                if (strcmp(reg_str0, "APSR_nzcv") == 0) {
                    reg_dest = 15;
                } else {
                    reg_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
                }
                const char *reg_str1 = get_arg_str(pn_args[1]);
                if (strcmp(reg_str1, "FPSCR") == 0) {
                    // FP status to ARM reg
                    asm_thumb_op32(emit->as, 0xeef1, 0x0a10 | (reg_dest << 12));
                } else {
                    goto unknown_op;
                }
            } else if (strcmp(op_str, "vmov") == 0) {
                op_code_hi = 0xee00;
                mp_uint_t r_arm, vm;
                const char *reg_str = get_arg_str(pn_args[0]);
                if (reg_str[0] == 'r') {
                    r_arm = get_arg_reg(emit, op_str, pn_args[0], 15);
                    vm = get_arg_vfpreg(emit, op_str, pn_args[1]);
                    op_code_hi |= 0x10;
                } else {
                    vm = get_arg_vfpreg(emit, op_str, pn_args[0]);
                    r_arm = get_arg_reg(emit, op_str, pn_args[1], 15);
                }
                asm_thumb_op32(emit->as,
                    op_code_hi | ((vm & 0x1e) >> 1),
                    0x0a10 | (r_arm << 12) | ((vm & 1) << 7));
            } else if (strcmp(op_str, "vldr") == 0) {
                op_code_hi = 0xed90;
                op_vldr_vstr:;
                mp_uint_t vd = get_arg_vfpreg(emit, op_str, pn_args[0]);
                mp_parse_node_t pn_base, pn_offset;
                if (get_arg_addr(emit, op_str, pn_args[1], &pn_base, &pn_offset)) {
                    mp_uint_t rlo_base = get_arg_reg(emit, op_str, pn_base, 7);
                    mp_uint_t i8;
                    i8 = get_arg_i(emit, op_str, pn_offset, 0xff);
                    asm_thumb_op32(emit->as,
                        op_code_hi | rlo_base | ((vd & 1) << 6),
                        0x0a00 | ((vd & 0x1e) << 11) | i8);
                }
            } else if (strcmp(op_str, "vstr") == 0) {
                op_code_hi = 0xed80;
                goto op_vldr_vstr;
            } else {
                goto unknown_op;
            }
        } else if (n_args == 3) {
            // search table for arith ops
            for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(format_vfp_op_table); i++) {
                if (strncmp(op_str + 1, format_vfp_op_table[i].name, 3) == 0 && op_str[4] == '\0') {
                    mp_uint_t op_code_hi = 0xee00 | (format_vfp_op_table[i].op & 0xf0);
                    mp_uint_t op_code = 0x0a00 | ((format_vfp_op_table[i].op & 0x0f) << 4);
                    mp_uint_t vd = get_arg_vfpreg(emit, op_str, pn_args[0]);
                    mp_uint_t vn = get_arg_vfpreg(emit, op_str, pn_args[1]);
                    mp_uint_t vm = get_arg_vfpreg(emit, op_str, pn_args[2]);
                    asm_thumb_op32(emit->as,
                        op_code_hi | ((vd & 1) << 6) | (vn >> 1),
                        op_code | (vm >> 1) | ((vm & 1) << 5) | ((vd & 0x1e) << 11) | ((vn & 1) << 7));
                    return;
                }
            }
            goto unknown_op;
        } else {
            goto unknown_op;
        }
    } else
    #endif
508
    if (n_args == 0) {
509
510
511
512
        if (strcmp(op_str, "nop") == 0) {
            asm_thumb_op16(emit->as, ASM_THUMB_OP_NOP);
        } else if (strcmp(op_str, "wfi") == 0) {
            asm_thumb_op16(emit->as, ASM_THUMB_OP_WFI);
513
514
        } else {
            goto unknown_op;
515
        }
516
517
518

    } else if (n_args == 1) {
        if (strcmp(op_str, "b") == 0) {
519
            int label_num = get_arg_label(emit, op_str, pn_args[0]);
520
521
522
            if (!asm_thumb_b_n_label(emit->as, label_num)) {
                goto branch_not_in_range;
            }
523
524
        } else if (strcmp(op_str, "bl") == 0) {
            int label_num = get_arg_label(emit, op_str, pn_args[0]);
525
526
527
            if (!asm_thumb_bl_label(emit->as, label_num)) {
                goto branch_not_in_range;
            }
528
529
530
        } else if (strcmp(op_str, "bx") == 0) {
            mp_uint_t r = get_arg_reg(emit, op_str, pn_args[0], 15);
            asm_thumb_op16(emit->as, 0x4700 | (r << 3));
531
532
        } else if (op_str[0] == 'b' && (op_len == 3
                    || (op_len == 5 && op_str[3] == '_'
533
                        && (op_str[4] == 'n' || (ARMV7M && op_str[4] == 'w'))))) {
534
535
            mp_uint_t cc = -1;
            for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(cc_name_table); i++) {
536
537
538
539
540
541
542
                if (op_str[1] == cc_name_table[i].name[0] && op_str[2] == cc_name_table[i].name[1]) {
                    cc = cc_name_table[i].cc;
                }
            }
            if (cc == -1) {
                goto unknown_op;
            }
543
            int label_num = get_arg_label(emit, op_str, pn_args[0]);
544
            if (!asm_thumb_bcc_nw_label(emit->as, cc, label_num, op_len == 5 && op_str[4] == 'w')) {
545
546
                goto branch_not_in_range;
            }
547
        } else if (ARMV7M && op_str[0] == 'i' && op_str[1] == 't') {
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
            const char *arg_str = get_arg_str(pn_args[0]);
            mp_uint_t cc = -1;
            for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(cc_name_table); i++) {
                if (arg_str[0] == cc_name_table[i].name[0]
                    && arg_str[1] == cc_name_table[i].name[1]
                    && arg_str[2] == '\0') {
                    cc = cc_name_table[i].cc;
                    break;
                }
            }
            if (cc == -1) {
                goto unknown_op;
            }
            const char *os = op_str + 2;
            while (*os != '\0') {
                os++;
            }
            if (os > op_str + 5) {
                goto unknown_op;
            }
            mp_uint_t it_mask = 8;
            while (--os >= op_str + 2) {
                it_mask >>= 1;
                if (*os == 't') {
                    it_mask |= (cc & 1) << 3;
                } else if (*os == 'e') {
                    it_mask |= ((~cc) & 1) << 3;
                } else {
                    goto unknown_op;
                }
            }
            asm_thumb_it_cc(emit->as, cc, it_mask);
580
        } else if (strcmp(op_str, "cpsid") == 0) {
581
582
            // TODO check pn_args[0] == i
            asm_thumb_op16(emit->as, ASM_THUMB_OP_CPSID_I);
583
        } else if (strcmp(op_str, "cpsie") == 0) {
584
585
            // TODO check pn_args[0] == i
            asm_thumb_op16(emit->as, ASM_THUMB_OP_CPSIE_I);
586
587
588
589
590
        } else if (strcmp(op_str, "push") == 0) {
            mp_uint_t reglist = get_arg_reglist(emit, op_str, pn_args[0]);
            if ((reglist & 0xff00) == 0) {
                asm_thumb_op16(emit->as, 0xb400 | reglist);
            } else {
591
592
593
                if (!ARMV7M) {
                    goto unknown_op;
                }
594
595
596
597
598
599
600
                asm_thumb_op32(emit->as, 0xe92d, reglist);
            }
        } else if (strcmp(op_str, "pop") == 0) {
            mp_uint_t reglist = get_arg_reglist(emit, op_str, pn_args[0]);
            if ((reglist & 0xff00) == 0) {
                asm_thumb_op16(emit->as, 0xbc00 | reglist);
            } else {
601
602
603
                if (!ARMV7M) {
                    goto unknown_op;
                }
604
605
                asm_thumb_op32(emit->as, 0xe8bd, reglist);
            }
606
607
        } else {
            goto unknown_op;
608
        }
609
610

    } else if (n_args == 2) {
611
612
        if (MP_PARSE_NODE_IS_ID(pn_args[1])) {
            // second arg is a register (or should be)
613
            mp_uint_t op_code, op_code_hi;
614
            if (strcmp(op_str, "mov") == 0) {
615
616
                mp_uint_t reg_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
                mp_uint_t reg_src = get_arg_reg(emit, op_str, pn_args[1], 15);
617
                asm_thumb_mov_reg_reg(emit->as, reg_dest, reg_src);
618
            } else if (ARMV7M && strcmp(op_str, "clz") == 0) {
619
620
621
622
623
624
625
                op_code_hi = 0xfab0;
                op_code = 0xf080;
                mp_uint_t rd, rm;
                op_clz_rbit:
                rd = get_arg_reg(emit, op_str, pn_args[0], 15);
                rm = get_arg_reg(emit, op_str, pn_args[1], 15);
                asm_thumb_op32(emit->as, op_code_hi | rm, op_code | (rd << 8) | rm);
626
            } else if (ARMV7M && strcmp(op_str, "rbit") == 0) {
627
628
629
                op_code_hi = 0xfa90;
                op_code = 0xf0a0;
                goto op_clz_rbit;
630
            } else {
631
632
633
634
635
636
637
                if (strcmp(op_str, "and_") == 0) {
                    op_code = ASM_THUMB_FORMAT_4_AND;
                    mp_uint_t reg_dest, reg_src;
                    op_format_4:
                    reg_dest = get_arg_reg(emit, op_str, pn_args[0], 7);
                    reg_src = get_arg_reg(emit, op_str, pn_args[1], 7);
                    asm_thumb_format_4(emit->as, op_code, reg_dest, reg_src);
638
                    return;
639
                }
640
                // search table for ALU ops
641
642
643
644
645
646
                for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(format_4_op_table); i++) {
                    if (strncmp(op_str, format_4_op_table[i].name, 3) == 0 && op_str[3] == '\0') {
                        op_code = 0x4000 | (format_4_op_table[i].op << 4);
                        goto op_format_4;
                    }
                }
647
648
                goto unknown_op;
            }
649
        } else {
650
            // second arg is not a register
651
            mp_uint_t op_code;
652
653
            if (strcmp(op_str, "mov") == 0) {
                op_code = ASM_THUMB_FORMAT_3_MOV;
654
                mp_uint_t rlo_dest, i8_src;
655
656
657
658
659
660
661
662
663
664
665
666
667
                op_format_3:
                rlo_dest = get_arg_reg(emit, op_str, pn_args[0], 7);
                i8_src = get_arg_i(emit, op_str, pn_args[1], 0xff);
                asm_thumb_format_3(emit->as, op_code, rlo_dest, i8_src);
            } else if (strcmp(op_str, "cmp") == 0) {
                op_code = ASM_THUMB_FORMAT_3_CMP;
                goto op_format_3;
            } else if (strcmp(op_str, "add") == 0) {
                op_code = ASM_THUMB_FORMAT_3_ADD;
                goto op_format_3;
            } else if (strcmp(op_str, "sub") == 0) {
                op_code = ASM_THUMB_FORMAT_3_SUB;
                goto op_format_3;
668
            } else if (ARMV7M && strcmp(op_str, "movw") == 0) {
669
670
671
672
                op_code = ASM_THUMB_OP_MOVW;
                mp_uint_t reg_dest;
                op_movw_movt:
                reg_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
673
                int i_src = get_arg_i(emit, op_str, pn_args[1], 0xffff);
674
                asm_thumb_mov_reg_i16(emit->as, op_code, reg_dest, i_src);
675
            } else if (ARMV7M && strcmp(op_str, "movt") == 0) {
676
677
                op_code = ASM_THUMB_OP_MOVT;
                goto op_movw_movt;
678
            } else if (ARMV7M && strcmp(op_str, "movwt") == 0) {
679
680
                // this is a convenience instruction
                // we clear the MSB since it might be set from extracting the small int value
681
                mp_uint_t reg_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
682
                int i_src = get_arg_i(emit, op_str, pn_args[1], 0xffffffff);
683
684
                asm_thumb_mov_reg_i16(emit->as, ASM_THUMB_OP_MOVW, reg_dest, i_src & 0xffff);
                asm_thumb_mov_reg_i16(emit->as, ASM_THUMB_OP_MOVT, reg_dest, (i_src >> 16) & 0x7fff);
685
            } else if (ARMV7M && strcmp(op_str, "ldrex") == 0) {
686
687
688
689
690
691
692
                mp_uint_t r_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
                mp_parse_node_t pn_base, pn_offset;
                if (get_arg_addr(emit, op_str, pn_args[1], &pn_base, &pn_offset)) {
                    mp_uint_t r_base = get_arg_reg(emit, op_str, pn_base, 15);
                    mp_uint_t i8 = get_arg_i(emit, op_str, pn_offset, 0xff) >> 2;
                    asm_thumb_op32(emit->as, 0xe850 | r_base, 0x0f00 | (r_dest << 12) | i8);
                }
693
            } else {
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
                // search table for ldr/str instructions
                for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(format_9_10_op_table); i++) {
                    if (strcmp(op_str, format_9_10_op_table[i].name) == 0) {
                        op_code = format_9_10_op_table[i].op;
                        mp_parse_node_t pn_base, pn_offset;
                        mp_uint_t rlo_dest = get_arg_reg(emit, op_str, pn_args[0], 7);
                        if (get_arg_addr(emit, op_str, pn_args[1], &pn_base, &pn_offset)) {
                            mp_uint_t rlo_base = get_arg_reg(emit, op_str, pn_base, 7);
                            mp_uint_t i5;
                            if (op_code & ASM_THUMB_FORMAT_9_BYTE_TRANSFER) {
                                i5 = get_arg_i(emit, op_str, pn_offset, 0x1f);
                            } else if (op_code & ASM_THUMB_FORMAT_10_STRH) { // also catches LDRH
                                i5 = get_arg_i(emit, op_str, pn_offset, 0x3e) >> 1;
                            } else {
                                i5 = get_arg_i(emit, op_str, pn_offset, 0x7c) >> 2;
                            }
                            asm_thumb_format_9_10(emit->as, op_code, rlo_dest, rlo_base, i5);
                            return;
                        }
                        break;
                    }
                }
716
717
                goto unknown_op;
            }
718
        }
719
720

    } else if (n_args == 3) {
721
        mp_uint_t op_code;
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
        if (strcmp(op_str, "lsl") == 0) {
            op_code = ASM_THUMB_FORMAT_1_LSL;
            mp_uint_t rlo_dest, rlo_src, i5;
            op_format_1:
            rlo_dest = get_arg_reg(emit, op_str, pn_args[0], 7);
            rlo_src = get_arg_reg(emit, op_str, pn_args[1], 7);
            i5 = get_arg_i(emit, op_str, pn_args[2], 0x1f);
            asm_thumb_format_1(emit->as, op_code, rlo_dest, rlo_src, i5);
        } else if (strcmp(op_str, "lsr") == 0) {
            op_code = ASM_THUMB_FORMAT_1_LSR;
            goto op_format_1;
        } else if (strcmp(op_str, "asr") == 0) {
            op_code = ASM_THUMB_FORMAT_1_ASR;
            goto op_format_1;
        } else if (strcmp(op_str, "add") == 0) {
737
            op_code = ASM_THUMB_FORMAT_2_ADD;
738
            mp_uint_t rlo_dest, rlo_src;
739
740
741
742
743
744
745
746
747
748
749
750
            op_format_2:
            rlo_dest = get_arg_reg(emit, op_str, pn_args[0], 7);
            rlo_src = get_arg_reg(emit, op_str, pn_args[1], 7);
            int src_b;
            if (MP_PARSE_NODE_IS_ID(pn_args[2])) {
                op_code |= ASM_THUMB_FORMAT_2_REG_OPERAND;
                src_b = get_arg_reg(emit, op_str, pn_args[2], 7);
            } else {
                op_code |= ASM_THUMB_FORMAT_2_IMM_OPERAND;
                src_b = get_arg_i(emit, op_str, pn_args[2], 0x7);
            }
            asm_thumb_format_2(emit->as, op_code, rlo_dest, rlo_src, src_b);
751
        } else if (ARMV7M && strcmp(op_str, "sdiv") == 0) {
752
753
754
755
756
757
758
            op_code = 0xfb90; // sdiv high part
            mp_uint_t rd, rn, rm;
            op_sdiv_udiv:
            rd = get_arg_reg(emit, op_str, pn_args[0], 15);
            rn = get_arg_reg(emit, op_str, pn_args[1], 15);
            rm = get_arg_reg(emit, op_str, pn_args[2], 15);
            asm_thumb_op32(emit->as, op_code | rn, 0xf0f0 | (rd << 8) | rm);
759
        } else if (ARMV7M && strcmp(op_str, "udiv") == 0) {
760
761
            op_code = 0xfbb0; // udiv high part
            goto op_sdiv_udiv;
762
763
764
        } else if (strcmp(op_str, "sub") == 0) {
            op_code = ASM_THUMB_FORMAT_2_SUB;
            goto op_format_2;
765
        } else if (ARMV7M && strcmp(op_str, "strex") == 0) {
766
767
768
769
770
771
772
773
            mp_uint_t r_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
            mp_uint_t r_src = get_arg_reg(emit, op_str, pn_args[1], 15);
            mp_parse_node_t pn_base, pn_offset;
            if (get_arg_addr(emit, op_str, pn_args[2], &pn_base, &pn_offset)) {
                mp_uint_t r_base = get_arg_reg(emit, op_str, pn_base, 15);
                mp_uint_t i8 = get_arg_i(emit, op_str, pn_offset, 0xff) >> 2;
                asm_thumb_op32(emit->as, 0xe840 | r_base, (r_src << 12) | (r_dest << 8) | i8);
            }
774
775
        } else {
            goto unknown_op;
776
777
778
        }

    } else {
779
        goto unknown_op;
780
    }
781
782
783
784

    return;

unknown_op:
785
    emit_inline_thumb_error_exc(emit, mp_obj_new_exception_msg_varg(&mp_type_SyntaxError, "unsupported Thumb instruction '%s' with %d arguments", op_str, n_args));
786
787
788
789
790
    return;

branch_not_in_range:
    emit_inline_thumb_error_msg(emit, "branch not in range");
    return;
791
792
793
794
795
}

const emit_inline_asm_method_table_t emit_inline_thumb_method_table = {
    emit_inline_thumb_start_pass,
    emit_inline_thumb_end_pass,
796
    emit_inline_thumb_count_params,
797
    emit_inline_thumb_label,
798
799
    emit_inline_thumb_align,
    emit_inline_thumb_data,
800
801
802
    emit_inline_thumb_op,
};

803
#endif // MICROPY_EMIT_INLINE_THUMB