110 lines
3.6 KiB
C
110 lines
3.6 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) 2014 Fabian Vogt
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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 <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include "py/mpstate.h"
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#include "py/gc.h"
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#if MICROPY_EMIT_NATIVE || (MICROPY_PY_FFI && MICROPY_FORCE_PLAT_ALLOC_EXEC)
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#if defined(__OpenBSD__) || defined(__MACH__)
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#define MAP_ANONYMOUS MAP_ANON
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#endif
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// The memory allocated here is not on the GC heap (and it may contain pointers
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// that need to be GC'd) so we must somehow trace this memory. We do it by
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// keeping a linked list of all mmap'd regions, and tracing them explicitly.
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typedef struct _mmap_region_t {
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void *ptr;
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size_t len;
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struct _mmap_region_t *next;
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} mmap_region_t;
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void mp_unix_alloc_exec(size_t min_size, void **ptr, size_t *size) {
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// size needs to be a multiple of the page size
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*size = (min_size + 0xfff) & (~0xfff);
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*ptr = mmap(NULL, *size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (*ptr == MAP_FAILED) {
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*ptr = NULL;
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}
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// add new link to the list of mmap'd regions
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mmap_region_t *rg = m_new_obj(mmap_region_t);
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rg->ptr = *ptr;
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rg->len = min_size;
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rg->next = MP_STATE_VM(mmap_region_head);
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MP_STATE_VM(mmap_region_head) = rg;
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}
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void mp_unix_free_exec(void *ptr, size_t size) {
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munmap(ptr, size);
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// unlink the mmap'd region from the list
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for (mmap_region_t **rg = (mmap_region_t **)&MP_STATE_VM(mmap_region_head); *rg != NULL; *rg = (*rg)->next) {
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if ((*rg)->ptr == ptr) {
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mmap_region_t *next = (*rg)->next;
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m_del_obj(mmap_region_t, *rg);
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*rg = next;
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return;
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}
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}
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}
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void mp_unix_mark_exec(void) {
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for (mmap_region_t *rg = MP_STATE_VM(mmap_region_head); rg != NULL; rg = rg->next) {
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gc_collect_root(rg->ptr, rg->len / sizeof(mp_uint_t));
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}
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}
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#if MICROPY_FORCE_PLAT_ALLOC_EXEC
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// Provide implementation of libffi ffi_closure_* functions in terms
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// of the functions above. On a normal Linux system, this save a lot
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// of code size.
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void *ffi_closure_alloc(size_t size, void **code);
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void ffi_closure_free(void *ptr);
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void *ffi_closure_alloc(size_t size, void **code) {
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size_t dummy;
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mp_unix_alloc_exec(size, code, &dummy);
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return *code;
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}
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void ffi_closure_free(void *ptr) {
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(void)ptr;
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// TODO
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}
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#endif
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MP_REGISTER_ROOT_POINTER(void *mmap_region_head);
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#endif // MICROPY_EMIT_NATIVE || (MICROPY_PY_FFI && MICROPY_FORCE_PLAT_ALLOC_EXEC)
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