42 lines
2.5 KiB
C
42 lines
2.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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#include "libc/runtime/memtrack.h"
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#include "libc/runtime/runtime.h"
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/**
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* Returns true if address isn't stack and was malloc'd or mmap'd.
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*
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* @assume stack addresses are always greater than heap addresses
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* @assume stack memory isn't stored beneath %rsp (-mno-red-zone)
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*/
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bool isheap(void *p) {
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int x, i;
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uintptr_t rsp;
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asm("mov\t%%rsp,%0" : "=r"(rsp));
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if (ROUNDDOWN(rsp, STACKSIZE) == ROUNDDOWN((intptr_t)p, STACKSIZE)) {
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return false;
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} else {
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if ((intptr_t)p <= (intptr_t)_end) return false;
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x = (intptr_t)p >> 16;
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i = FindMemoryInterval(&_mmi, x);
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return i < _mmi.i && x >= _mmi.p[i].x && x <= _mmi.p[i].y;
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}
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}
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