From be024e2a16087adf038088091ebb304355d3d421 Mon Sep 17 00:00:00 2001
From: Nuno Cruces <ncruces@users.noreply.github.com>
Date: Thu, 13 Jun 2024 14:44:51 +0100
Subject: [PATCH] x/sys: add unsafe mmap, munmap, mremap

Fixes golang/go#56123
---
 unix/mremap.go       | 5 +++++
 unix/syscall_unix.go | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/unix/mremap.go b/unix/mremap.go
index fd45fe52..3a5e776f 100644
--- a/unix/mremap.go
+++ b/unix/mremap.go
@@ -50,3 +50,8 @@ func (m *mremapMmapper) Mremap(oldData []byte, newLength int, flags int) (data [
 func Mremap(oldData []byte, newLength int, flags int) (data []byte, err error) {
 	return mapper.Mremap(oldData, newLength, flags)
 }
+
+func MremapPtr(oldAddr unsafe.Pointer, oldSize uintptr, newAddr unsafe.Pointer, newSize uintptr, flags int) (ret unsafe.Pointer, err error) {
+	xaddr, err := mapper.mremap(uintptr(oldAddr), oldSize, newSize, flags, uintptr(newAddr))
+	return unsafe.Pointer(xaddr), err
+}
diff --git a/unix/syscall_unix.go b/unix/syscall_unix.go
index 77081de8..88909f13 100644
--- a/unix/syscall_unix.go
+++ b/unix/syscall_unix.go
@@ -154,6 +154,15 @@ func Munmap(b []byte) (err error) {
 	return mapper.Munmap(b)
 }
 
+func MmapPtr(addr unsafe.Pointer, length uintptr, prot int, flags int, fd int, offset int64) (ret unsafe.Pointer, err error) {
+	xaddr, err := mapper.mmap(uintptr(addr), length, prot, flags, fd, offset)
+	return unsafe.Pointer(xaddr), err
+}
+
+func MunmapPtr(addr unsafe.Pointer, length uintptr) (err error) {
+	return mapper.munmap(uintptr(addr), length)
+}
+
 func Read(fd int, p []byte) (n int, err error) {
 	n, err = read(fd, p)
 	if raceenabled {