mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
78 lines
3.9 KiB
C
78 lines
3.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/calls/syscall-sysv.internal.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/intrin/describeflags.internal.h"
|
|
#include "libc/intrin/directmap.internal.h"
|
|
#include "libc/intrin/strace.internal.h"
|
|
#include "libc/nt/runtime.h"
|
|
#include "libc/runtime/memtrack.internal.h"
|
|
|
|
/**
|
|
* Obtains memory mapping directly from system.
|
|
*
|
|
* The mmap() function needs to track memory mappings in order to
|
|
* support Windows NT and Address Sanitizer. That memory tracking can be
|
|
* bypassed by calling this function. However the caller is responsible
|
|
* for passing the magic memory handle on Windows NT to CloseHandle().
|
|
*
|
|
* @asyncsignalsafe
|
|
* @threadsafe
|
|
*/
|
|
struct DirectMap sys_mmap(void *addr, size_t size, int prot, int flags, int fd,
|
|
int64_t off) {
|
|
#ifdef __x86_64__
|
|
struct DirectMap d;
|
|
if (!IsWindows() && !IsMetal()) {
|
|
d.addr = __sys_mmap(addr, size, prot, flags, fd, off, off);
|
|
d.maphandle = kNtInvalidHandleValue;
|
|
} else if (IsMetal()) {
|
|
d = sys_mmap_metal(addr, size, prot, flags, fd, off);
|
|
} else {
|
|
d = sys_mmap_nt(addr, size, prot, flags, fd, off);
|
|
}
|
|
KERNTRACE("sys_mmap(%.12p /* %s */, %'zu, %s, %s, %d, %'ld) → {%.12p, %p}% m",
|
|
addr, DescribeFrame((intptr_t)addr >> 16), size,
|
|
DescribeProtFlags(prot), DescribeMapFlags(flags), fd, off, d.addr,
|
|
d.maphandle);
|
|
return d;
|
|
#elif defined(__aarch64__)
|
|
register long r0 asm("x0") = (long)addr;
|
|
register long r1 asm("x1") = (long)size;
|
|
register long r2 asm("x2") = (long)prot;
|
|
register long r3 asm("x3") = (long)flags;
|
|
register long r4 asm("x4") = (long)fd;
|
|
register long r5 asm("x5") = (long)off;
|
|
register long res_x0 asm("x0");
|
|
long res;
|
|
asm volatile("mov\tx8,%1\n"
|
|
"svc\t0"
|
|
: "=r"(res_x0)
|
|
: "i"(222), "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r5)
|
|
: "x8", "memory");
|
|
res = res_x0;
|
|
if ((unsigned long)res >= (unsigned long)-4095) {
|
|
errno = (int)-res;
|
|
res = -1;
|
|
}
|
|
return (struct DirectMap){(void *)res, kNtInvalidHandleValue};
|
|
#else
|
|
#error "arch unsupported"
|
|
#endif
|
|
}
|