mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
daf4454a06
- Work towards improving non-optimized build support - Introduce MODE=zero which is -O0 without ASAN/UBSAN - Use system GCC when ~/.cosmo.mk has USE_SYSTEM_TOOLCHAIN=1 - Have package.com check .privileged code doesn't call non-privileged
75 lines
3.5 KiB
C
75 lines
3.5 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 2021 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/calls.h"
|
|
#include "libc/calls/syscall-sysv.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/intrin/asmflag.h"
|
|
#include "libc/intrin/strace.internal.h"
|
|
#include "libc/sysv/consts/map.h"
|
|
#include "libc/sysv/consts/mremap.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
/**
|
|
* Relocates memory.
|
|
*
|
|
* This function lets you move to to different addresses witohut copying
|
|
* it. This system call is currently supported on Linux and NetBSD. Your
|
|
* C library runtime won't have any awareness of this memory, so certain
|
|
* features like ASAN memory safety and kprintf() won't work as well.
|
|
*/
|
|
void *sys_mremap(void *p, size_t n, size_t m, int f, void *q) {
|
|
#ifdef __x86_64__
|
|
bool cf;
|
|
uintptr_t res, rdi, rsi, rdx;
|
|
register uintptr_t r8 asm("r8");
|
|
register uintptr_t r10 asm("r10");
|
|
if (IsLinux()) {
|
|
r10 = f;
|
|
r8 = (uintptr_t)q;
|
|
asm("syscall"
|
|
: "=a"(res)
|
|
: "0"(0x019), "D"(p), "S"(n), "d"(m), "r"(r10), "r"(r8)
|
|
: "rcx", "r11", "memory", "cc");
|
|
if (res > -4096ul) errno = -res, res = -1;
|
|
} else if (IsNetbsd()) {
|
|
if (f & MREMAP_MAYMOVE) {
|
|
res = 0x19B;
|
|
r10 = m;
|
|
r8 = (f & MREMAP_FIXED) ? MAP_FIXED : 0;
|
|
asm(CFLAG_ASM("syscall")
|
|
: CFLAG_CONSTRAINT(cf), "+a"(res), "=d"(rdx)
|
|
: "D"(p), "S"(n), "2"(q), "r"(r10), "r"(r8)
|
|
: "rcx", "r9", "r11", "memory", "cc");
|
|
if (cf) errno = res, res = -1;
|
|
} else {
|
|
res = einval();
|
|
}
|
|
} else {
|
|
res = enosys();
|
|
}
|
|
#elif defined(__aarch64__)
|
|
void *res;
|
|
res = __sys_mremap(p, n, m, f, q);
|
|
#else
|
|
#error "arch unsupported"
|
|
#endif
|
|
KERNTRACE("sys_mremap(%p, %'zu, %'zu, %#b, %p) → %p% m", p, n, m, f, q, res);
|
|
return (void *)res;
|
|
}
|