mirror of
https://github.com/jart/cosmopolitan.git
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3e4fd4b0ad
This change also pays off some of the remaining technical debt with stdio, file descriptors, and memory managemnt polyfills.
61 lines
2.9 KiB
C
61 lines
2.9 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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#define ShouldUseMsabiAttribute() 1
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#include "libc/bits/bits.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/sysv/consts/nr.h"
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/**
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* Modifies restrictions on virtual memory address range.
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*
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* @param prot can have PROT_{NONE,READ,WRITE,EXEC,GROWSDOWN}
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* @return 0 on success, or -1 w/ errno
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* @see mmap()
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*/
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int mprotect(void *addr, uint64_t len, int prot) {
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extern __msabi typeof(VirtualProtect) *const __imp_VirtualProtect;
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bool cf;
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int64_t rc;
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uint32_t oldprot;
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if (!IsWindows()) {
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asm volatile(CFLAG_ASM("syscall")
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: CFLAG_CONSTRAINT(cf), "=a"(rc)
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: "1"(__NR_mprotect), "D"(addr), "S"(len), "d"(prot)
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: "rcx", "r11", "memory", "cc");
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if (cf) {
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rc = -rc;
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rc = -1;
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} else if (rc > -4096ul) {
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errno = -rc;
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rc = -1;
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}
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return rc;
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} else {
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if (__imp_VirtualProtect(addr, len, prot2nt(prot, 0), &oldprot)) {
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return 0;
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} else {
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return __winerr();
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}
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}
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}
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