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bde8ef7af7
Wire everything that relies on stack smashing detection to call `__stack_chk_fail()` (aka what libssp / ssp / stack-protector uses) Expose it in our debugging header Rename overflow -> smashing, as these are different things we are trying to detect (meaning, that we check for things writing there, not some kind of `alloca` issue or the way `-fstack-check` would have worked) ref. #8666 `-fstack-protector` continues to work as it always did CONT replaces `abort()`, also moves its check to the loop wrapper to avoid dumping otherwise useless SYS context memory StackThunk replaces a similar `abort()` call
87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/*
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cont.h - 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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#ifndef CONT_H_
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#define CONT_H_
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#include <stdbool.h>
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#ifndef CONT_STACKSIZE
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#define CONT_STACKSIZE 4096
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct cont_ {
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void (*pc_ret)(void);
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unsigned* sp_ret;
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void (*pc_suspend)(void);
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unsigned* sp_suspend;
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unsigned* stack_end;
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unsigned unused1;
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unsigned unused2;
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unsigned stack_guard1;
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unsigned stack[CONT_STACKSIZE / 4];
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unsigned stack_guard2;
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unsigned* struct_start;
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} cont_t;
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extern cont_t* g_pcont;
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// Initialize the cont_t structure before calling cont_run
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void cont_init(cont_t*);
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// Run function pfn in a separate stack, or continue execution
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// at the point where cont_suspend was called
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void cont_run(cont_t*, void (*pfn)(void));
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// Return to the point where cont_run was called, saving the
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// execution state (registers and stack)
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void cont_suspend(cont_t*);
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// Check guard bytes around the stack. Immediately panics on failure.
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void cont_check(cont_t*);
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// Go through stack and check how many bytes are most probably still unchanged
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// and thus weren't used by the user code. i.e. that stack space is free. (high water mark)
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int cont_get_free_stack(cont_t* cont);
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// Check if cont_suspend() may be called. Returns true if we are running inside
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// continuation stack
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bool cont_can_suspend(cont_t* cont);
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// Repaint the stack from the current SP to the end, to allow individual
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// routines' stack usages to be calculated by re-painting, checking current
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// free, running the routine, then checking the max free
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void cont_repaint_stack(cont_t *cont);
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONT_H_ */
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