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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2015-2017 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 "py/mpstate.h"
#include "py/gc.h"
__attribute__((naked)) uint32_t gc_helper_get_regs_and_sp(uint32_t *regs) {
(void)regs;
// store registers into given array and return the stack pointer
__asm volatile (
"str r4, [r0, #0]\n"
"str r5, [r0, #4]\n"
"str r6, [r0, #8]\n"
"str r7, [r0, #12]\n"
"mov r1, r8\n"
"str r1, [r0, #16]\n"
"mov r1, r9\n"
"str r1, [r0, #20]\n"
"mov r1, r10\n"
"str r1, [r0, #24]\n"
"mov r1, r11\n"
"str r1, [r0, #28]\n"
"mov r1, r12\n"
"str r1, [r0, #32]\n"
"mov r1, r13\n"
"str r1, [r0, #36]\n"
"mov r0, sp\n"
"bx lr\n"
);
}
void gc_collect(void) {
gc_collect_start();
// get the registers and the sp
uint32_t regs[10];
uint32_t sp = gc_helper_get_regs_and_sp(regs);
// trace the stack, including the registers (since they live on the stack in this function)
gc_collect_root((void**)sp, ((uint32_t)MP_STATE_THREAD(stack_top) - sp) / sizeof(uint32_t));
gc_collect_end();
}
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