From 1a57267a17c2fc17fb6e104846fabc3e363c326c Mon Sep 17 00:00:00 2001
From: Emile <git@emile.space>
Date: Fri, 16 Aug 2024 19:50:26 +0200
Subject: initial commit

---
 vendor/modernc.org/memory/mmap_illumos_amd64.go | 91 +++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 vendor/modernc.org/memory/mmap_illumos_amd64.go

(limited to 'vendor/modernc.org/memory/mmap_illumos_amd64.go')

diff --git a/vendor/modernc.org/memory/mmap_illumos_amd64.go b/vendor/modernc.org/memory/mmap_illumos_amd64.go
new file mode 100644
index 0000000..1006fe8
--- /dev/null
+++ b/vendor/modernc.org/memory/mmap_illumos_amd64.go
@@ -0,0 +1,91 @@
+// Copyright 2011 Evan Shaw. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE-MMAP-GO file.
+
+// Modifications (c) 2022 The Memory Authors.
+
+package memory // import "modernc.org/memory"
+
+import (
+	"os"
+	"syscall"
+	_ "unsafe"
+)
+
+const (
+	pageSizeLog = 20
+
+	// $ find /usr/include -name syscall.h
+	// /usr/include/sys/syscall.h
+	// $ grep -ni munmap /usr/include/sys/syscall.h
+	// 293:#define     SYS_munmap      117
+	// $ grep -ni mmap /usr/include/sys/syscall.h
+	// 291:#define	SYS_mmap	115
+	// 303:#define	SYS_mmapobj	127
+	// 442:#define	SYS_mmap64		214
+	// $
+	// $ uname -a
+	// SunOS omnios64 5.11 omnios-r151044-d3b715b9d1 i86pc i386 i86pc
+	// $
+	sys_MUNMAP = 117
+	sys_MMAP   = 214
+)
+
+var (
+	osPageMask = osPageSize - 1
+	osPageSize = os.Getpagesize()
+)
+
+//go:linkname mmapSyscall syscall.mmap
+func mmapSyscall(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error)
+
+func unmap(addr uintptr, size int) error {
+	_, _, errno := syscall.Syscall(sys_MUNMAP, addr, uintptr(size), 0)
+	if errno != 0 {
+		return errno
+	}
+
+	return nil
+}
+
+// pageSize aligned.
+func mmap(size int) (uintptr, int, error) {
+	size = roundup(size, osPageSize)
+	// The actual mmap syscall varies by architecture. mmapSyscall provides same
+	// functionality as the unexported funtion syscall.mmap and is declared in
+	// mmap_*_*.go and mmap_fallback.go. To add support for a new architecture,
+	// check function mmap in src/syscall/syscall_*_*.go or
+	// src/syscall/zsyscall_*_*.go in Go's source code.
+	p, err := mmapSyscall(0, uintptr(size+pageSize), syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_PRIVATE|syscall.MAP_ANON, -1, 0)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	n := size + pageSize
+	if p&uintptr(osPageMask) != 0 {
+		panic("internal error")
+	}
+
+	mod := int(p) & pageMask
+	if mod != 0 {
+		m := pageSize - mod
+		if err := unmap(p, m); err != nil {
+			return 0, 0, err
+		}
+
+		n -= m
+		p += uintptr(m)
+	}
+
+	if p&uintptr(pageMask) != 0 {
+		panic("internal error")
+	}
+
+	if n-size != 0 {
+		if err := unmap(p+uintptr(size), n-size); err != nil {
+			return 0, 0, err
+		}
+	}
+
+	return p, size, nil
+}
-- 
cgit 1.4.1