107 lines
4.3 KiB
C
107 lines
4.3 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ 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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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/runtime.h"
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#include "libc/runtime/mappings.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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/**
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* Releases memory pages.
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*
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* @param addr is a pointer within any memory mapped region the process
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* has permission to control, such as address ranges returned by
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* mmap(), the program image itself, etc.
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* @param size is the amount of memory to unmap, which should be a
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* multiple of PAGESIZE, and may be a subset of that which was
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* mapped previously
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* @return 0 on success, or -1 w/ errno
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*/
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int __munmap(void *addr, size_t size) {
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int rc;
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intptr_t p;
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size_t i, j;
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struct AddrSize a;
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struct MemoryCoord c, m;
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p = (intptr_t)addr;
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assert(!(0 < p && p < 0x200000));
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assert(-0x800000000000L <= p && p <= 0x7fffffffffffL);
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if (!size) return 0;
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if (!addr || addr == MAP_FAILED) return 0;
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if (addr == NULL && size <= 0x200000) return 0;
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addr = (void *)ROUNDDOWN((intptr_t)addr, FRAMESIZE);
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size = ROUNDUP(size, FRAMESIZE);
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rc = 0;
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c = ADDRSIZE_TO_COORD(addr, size);
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j = findmapping(c.y);
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for (i = j; i; --i) {
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m = _mm.p[i - 1];
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assert(m.x <= m.y);
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assert(c.y >= m.x);
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if (c.x > m.y) {
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break;
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} else if (c.x > m.x && c.y < m.y) {
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/* remove middle portion */
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assert(!"map hole punching not implemented");
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} else if (c.x > m.x && c.y >= m.y) {
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/* remove righthand portion */
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assert(!"map hole punching not implemented");
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/* _mm.p[i - 1].y = c.x - 1; */
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/* i++; */
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/* break; */
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} else if (c.x <= m.x && c.y < m.y) {
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/* remove lefthand portion */
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assert(!"map hole punching not implemented");
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/* _mm.p[i - 1].x = c.y + 1; */
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/* j--; */
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} else if ((m.x >= c.x && m.x <= c.y) && (m.y >= c.x && m.y <= c.y)) {
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a = COORD_TO_ADDRSIZE(m);
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if (!IsWindows()) {
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rc |= munmap$sysv(a.addr, a.size);
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} else {
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if (!UnmapViewOfFile(a.addr)) rc = -1;
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if (!CloseHandle(_mm.h[i - 1])) rc = -1;
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}
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} else {
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assert(!"wut");
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}
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}
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if (i < j) {
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if (j < _mm.i) {
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memmove(&_mm.p[i], &_mm.p[j],
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(intptr_t)&_mm.p[_mm.i] - (intptr_t)&_mm.p[j]);
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memmove(&_mm.h[i], &_mm.h[j],
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(intptr_t)&_mm.h[_mm.i] - (intptr_t)&_mm.h[j]);
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}
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_mm.i -= j - i;
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}
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return rc;
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}
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