micropython-unicorn/unicorn/main.c

/*
 * This file is part of the MicroPython 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.
 */

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

#include "py/builtin.h"
#include "py/compile.h"
#include "py/runtime.h"
#include "py/stackctrl.h"
#include "py/repl.h"
#include "py/gc.h"
#include "py/mperrno.h"
#include "shared/runtime/interrupt_char.h"
#include "shared/runtime/pyexec.h"
#include "unicorn_mcu.h"

void do_str(const char *src, mp_parse_input_kind_t input_kind) {
    nlr_buf_t nlr;
    if (nlr_push(&nlr) == 0) {
        mp_lexer_t *lex = mp_lexer_new_from_str_len(MP_QSTR__lt_stdin_gt_, src, strlen(src), 0);
        mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
        mp_obj_t module_fun = mp_compile(&parse_tree, MP_QSTR__lt_stdin_gt_, false);
        mp_call_function_0(module_fun);
        nlr_pop();
    } else {
        // uncaught exception
        mp_obj_print_exception(&mp_plat_print, (mp_obj_t)nlr.ret_val);
    }
}

int main(int argc, char **argv) {
    extern uint32_t _ebss;
    extern uint32_t _sdata;

    // Stack limit should be less than real stack size, so we have a chance
    // to recover from limit hit.  (Limit is measured in bytes.)
    mp_stack_set_top((uint8_t*)&_sdata + UNICORN_CONTROLLER->RAM_SIZE);
    mp_stack_set_limit(UNICORN_CONTROLLER->STACK_SIZE - 1024);

    while (true) {
        gc_init(&_ebss, (uint8_t*)&_sdata + UNICORN_CONTROLLER->RAM_SIZE - UNICORN_CONTROLLER->STACK_SIZE);
        mp_init();

        do_str("for i in range(1):pass", MP_PARSE_FILE_INPUT);

        for (;;) {
            if (pyexec_mode_kind == PYEXEC_MODE_RAW_REPL) {
                if (pyexec_raw_repl() != 0) {
                    break;
                }
            } else {
                if (pyexec_friendly_repl() != 0) {
                    break;
                }
            }
        }
        mp_deinit();
        printf("PYB: soft reboot\n");
    }
    return 0;
}

void gc_collect(void) {
    // WARNING: This gc_collect implementation doesn't try to get root
    // pointers from CPU registers, and thus may function incorrectly.
    void *dummy;
    gc_collect_start();
    gc_collect_root(&dummy, ((mp_uint_t)MP_STATE_THREAD(stack_top) - (mp_uint_t)&dummy) / sizeof(mp_uint_t));
    gc_collect_end();
}

mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
    mp_raise_OSError(MP_ENOENT);
}

mp_import_stat_t mp_import_stat(const char *path) {
    return MP_IMPORT_STAT_NO_EXIST;
}

mp_obj_t mp_builtin_open(uint n_args, const mp_obj_t *args, mp_map_t *kwargs) {
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);

void nlr_jump_fail(void *val) {
    while (1);
}

void NORETURN __fatal_error(const char *msg) {
    while (1);
}

#ifndef NDEBUG
void MP_WEAK __assert_func(const char *file, int line, const char *func, const char *expr) {
    printf("Assertion '%s' failed, at file %s:%d\n", expr, file, line);
    __fatal_error("Assertion failed");
}
#endif

// this is a minimal IRQ and reset framework for any Cortex-M CPU

extern uint32_t _sidata, _sdata, _edata, _sbss, _ebss;

void Reset_Handler(void) __attribute__((naked));
void Reset_Handler(void) {
    // set stack pointer
    __asm volatile ("ldr r0, =0x08000000");
    __asm volatile ("ldr sp, [r0]");
    // copy .data section from flash to RAM
    for (uint32_t *src = &_sidata, *dest = &_sdata; dest < &_edata;) {
        *dest++ = *src++;
    }
    // zero out .bss section
    for (uint32_t *dest = &_sbss; dest < &_ebss;) {
        *dest++ = 0;
    }

    UNICORN_CONTROLLER->PENDING = (uint32_t) &MP_STATE_MAIN_THREAD(mp_pending_exception);
    UNICORN_CONTROLLER->EXCEPTION = (uint32_t) &MP_STATE_VM(mp_kbd_exception);
    UNICORN_CONTROLLER->INTR_CHAR = (uint32_t) &mp_interrupt_char;

    // jump to board initialisation
    void _start(void);
    _start();
}

void Default_Handler(void) {
    for (;;) {
    }
}

const uint32_t isr_vector[] __attribute__((section(".isr_vector"))) = {
    0, // will be set dynamically
    (uint32_t)&Reset_Handler,
    (uint32_t)&Default_Handler, // NMI_Handler
    (uint32_t)&Default_Handler, // HardFault_Handler
    (uint32_t)&Default_Handler, // MemManage_Handler
    (uint32_t)&Default_Handler, // BusFault_Handler
    (uint32_t)&Default_Handler, // UsageFault_Handler
    0,
    0,
    0,
    0,
    (uint32_t)&Default_Handler, // SVC_Handler
    (uint32_t)&Default_Handler, // DebugMon_Handler
    0,
    (uint32_t)&Default_Handler, // PendSV_Handler
    (uint32_t)&Default_Handler, // SysTick_Handler
};

void _start(void) {
    // when we get here: stack is initialised, bss is clear, data is copied

    // SCB->CCR: enable 8-byte stack alignment for IRQ handlers, in accord with EABI
    //*((volatile uint32_t*)0xe000ed14) |= 1 << 9;

    // initialise the cpu and peripherals

    // now that we have a basic system up and running we can call main
    main(0, NULL);

    // we must not return
    for (;;) {
    }
}