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1b1b0a28a8
Allow the unused stack to be reset to the check value at any time in the application, allowing for delta-stack calculations to be done. Add ESP.resetFreeContStack() class method for general use. Add in some dumping in the BearSSL_Validation example to show the usage for those that care.
82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/*
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cont_util.s - continuations support for Xtensa call0 ABI
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Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "cont.h"
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#include <stddef.h>
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#include <string.h>
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#include "ets_sys.h"
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#define CONT_STACKGUARD 0xfeefeffe
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void cont_init(cont_t* cont) {
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memset(cont, 0, sizeof(cont_t));
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cont->stack_guard1 = CONT_STACKGUARD;
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cont->stack_guard2 = CONT_STACKGUARD;
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cont->stack_end = cont->stack + (sizeof(cont->stack) / 4);
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cont->struct_start = (unsigned*) cont;
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// fill stack with magic values to check high water mark
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for(int pos = 0; pos < (int)(sizeof(cont->stack) / 4); pos++)
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{
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cont->stack[pos] = CONT_STACKGUARD;
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}
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}
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int ICACHE_RAM_ATTR cont_check(cont_t* cont) {
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if(cont->stack_guard1 != CONT_STACKGUARD || cont->stack_guard2 != CONT_STACKGUARD) return 1;
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return 0;
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}
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int ICACHE_RAM_ATTR cont_get_free_stack(cont_t* cont) {
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uint32_t *head = cont->stack;
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int freeWords = 0;
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while(*head == CONT_STACKGUARD)
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{
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head++;
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freeWords++;
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}
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return freeWords * 4;
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}
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bool ICACHE_RAM_ATTR cont_can_yield(cont_t* cont) {
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return !ETS_INTR_WITHINISR() &&
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cont->pc_ret != 0 && cont->pc_yield == 0;
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}
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// No need for this to be in IRAM, not expected to be IRQ called
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void cont_repaint_stack(cont_t *cont)
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{
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register uint32_t *sp asm("a1");
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// Ensure 64 bytes adjacent to the current SP don't get touched to endure
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// we don't accidentally trounce over locals or IRQ temps.
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uint32_t sp_safe = CONT_STACKSIZE/4 - ((sp - &cont->stack[0] - 64)/4);
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// Fill stack with magic values
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for(uint32_t pos = 0; pos < sp_safe; pos++)
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{
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cont->stack[pos] = CONT_STACKGUARD;
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}
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}
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