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https://github.com/jart/cosmopolitan.git
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9f149e1de3
It turns out adding OpenBSD msyscall() origin verification broke the --ftrace flag. The executable needs to issue raw syscalls while it's rewriting itself. So they need to be in the same section, and that's just plain simpler too.
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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│ 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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#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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extern __msabi typeof(VirtualProtect) *const __imp_VirtualProtect;
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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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privileged int mprotect(void *addr, uint64_t len, int prot) {
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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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