4fc2866f45
This commit simplifies and cleans up the bare-arm port, and adds just enough system and library code to make it execute on an STM32F405 MCU. The mpconfigport.h configuration is simplified to just specify those configuration values that are different from the defaults. And the addition of -fdata-sections and -ffunction-sections means the final firmware is smaller than it previously was, by about 4200 bytes. A README is also added. Signed-off-by: Damien George <damien@micropython.org>
129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2021 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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// These memory functions are needed when the garbage collector is disabled.
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// A full implementation should be provided, or the garbage collector enabled.
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// The functions here are very simple.
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extern char _heap_start;
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void *malloc(size_t n) {
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static char *cur_heap = NULL;
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if (cur_heap == NULL) {
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cur_heap = &_heap_start;
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}
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void *ptr = cur_heap;
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cur_heap += (n + 7) & ~7;
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return ptr;
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}
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void *realloc(void *ptr, size_t size) {
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void *ptr2 = malloc(size);
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if (ptr && size) {
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memcpy(ptr2, ptr, size); // size may be greater than ptr's region, do copy anyway
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}
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return ptr2;
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}
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void free(void *p) {
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}
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// These standard string functions are needed by the runtime, and can be
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// provided either by the system or lib/libc/string0.c. The implementations
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// here are very simple.
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int memcmp(const void *s1, const void *s2, size_t n) {
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const unsigned char *ss1 = s1, *ss2 = s2;
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while (n--) {
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int c = *ss1++ - *ss2++;
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if (c) {
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return c;
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}
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}
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return 0;
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}
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void *memcpy(void *dest, const void *src, size_t n) {
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return memmove(dest, src, n);
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}
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void *memmove(void *dest, const void *src, size_t n) {
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unsigned char *d = dest;
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const unsigned char *s = src;
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if (s < d && d < s + n) {
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// Need to copy backwards.
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d += n - 1;
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s += n - 1;
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while (n--) {
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*d-- = *s--;
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}
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} else {
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// Can copy forwards.
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while (n--) {
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*d++ = *s++;
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}
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}
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return dest;
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}
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void *memset(void *s, int c, size_t n) {
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unsigned char *ss = s;
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while (n--) {
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*ss++ = c;
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}
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return s;
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}
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char *strchr(const char *s, int c) {
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while (*s) {
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if (*s == c) {
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return (char *)s;
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}
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++s;
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}
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return NULL;
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}
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int strcmp(const char *s1, const char *s2) {
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while (*s1 && *s2) {
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int c = *s1++ - *s2++;
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if (c) {
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return c;
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}
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}
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return *s1 - *s2;
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}
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size_t strlen(const char *s) {
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const char *ss = s;
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while (*ss) {
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++ss;
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}
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return ss - s;
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}
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