//go:linkname _cgo_munmap _cgo_munmap
var _cgo_munmap unsafe.Pointer

// mmap is used to route the mmap system call through C code when using cgo, to
// support sanitizer interceptors. Don't allow stack splits, since this function
// (used by sysAlloc) is called in a lot of low-level parts of the runtime and
// callers often assume it won't acquire any locks.
//
//go:nosplit

	// for which we have computed the size and offset, in a
	// mmap'd region. The second part writes more content, for
	// which we don't know the size.
	if ctxt.Arch.Family != sys.Wasm {
		// Don't mmap if we're building for Wasm. Wasm file
		// layout is very different so filesize is meaningless.
		if err := ctxt.Out.Mmap(filesize); err != nil {
			Exitf("mapping output file failed: %v", err)
		}
	}

//go:build unix && (!solaris || go1.20)

package mmap

import (
	"fmt"
	"io/fs"
	"os"
	"syscall"
)

func mmapFile(f *os.File, _ *Data) (Data, error) {
	st, err := f.Stat()
	if err != nil {
		return Data{}, err
	}
	size := st.Size()
	pagesize := int64(os.Getpagesize())
	if int64(int(size+(pagesize-1))) != size+(pagesize-1) {
		return Data{}, fmt.Errorf("%s: too large for mmap", f.Name())
	}
	n := int(size)

func sysFaultOS(v unsafe.Pointer, n uintptr) {
	mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE|_MAP_FIXED, -1, 0)
}

func sysReserveOS(v unsafe.Pointer, n uintptr) unsafe.Pointer {
	p, err := mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
	if err != 0 {
		return nil
	}
	return p
}

const _ENOMEM = 12

func sysMapOS(v unsafe.Pointer, n uintptr) {

// license that can be found in the LICENSE file.

//go:build unix

package ld

import (
	"syscall"
)

// Mmap maps the output file with the given size. It unmaps the old mapping
// if it is already mapped. It also flushes any in-heap data to the new
// mapping.
func (out *OutBuf) Mmap(filesize uint64) (err error) {
	oldlen := len(out.buf)
	if oldlen != 0 {
		out.munmap()
	}

	for {

// prevents us from allocating more stack.
//
//go:nosplit
func sysAllocOS(n uintptr) unsafe.Pointer {
	p, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
	if err != 0 {
		if err == _EACCES {
			print("runtime: mmap: access denied\n")
			exit(2)
		}
		if err == _EAGAIN {
			print("runtime: mmap: too much locked memory (check 'ulimit -l').\n")
			exit(2)
		}
		return nil
	}
	return p
}

		// wherein large mappings can cause fork to fail.
		flags |= _sunosMAP_NORESERVE
	}
	p, err := mmap(v, n, _PROT_NONE, flags, -1, 0)
	if err != 0 {
		return nil
	}
	return p
}

const _sunosEAGAIN = 11
const _ENOMEM = 12

func sysMapOS(v unsafe.Pointer, n uintptr) {
	p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0)

//go:build !unix && !windows

package ld

// Mmap allocates an in-heap output buffer with the given size. It copies
// any old data (if any) to the new buffer.
func (out *OutBuf) Mmap(filesize uint64) error {
	// We need space to put all the symbols before we apply relocations.
	oldheap := out.heap
	if filesize < uint64(len(oldheap)) {
		panic("mmap size too small")
	}
	out.heap = make([]byte, filesize)

//go:build unix

package mmap

import (
	"fmt"
	"io/fs"
	"os"
	"syscall"
)

func mmapFile(f *os.File) (Data, error) {
	st, err := f.Stat()
	if err != nil {
		return Data{}, err
	}
	size := st.Size()
	pagesize := int64(os.Getpagesize())
	if int64(int(size+(pagesize-1))) != size+(pagesize-1) {
		return Data{}, fmt.Errorf("%s: too large for mmap", f.Name())
	}
	n := int(size)
	if n == 0 {

// prevents us from allocating more stack.
//
//go:nosplit
func sysAllocOS(n uintptr) unsafe.Pointer {
	p, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
	if err != 0 {
		if err == _EACCES {
			print("runtime: mmap: access denied\n")
			exit(2)
		}
		if err == _EAGAIN {
			print("runtime: mmap: too much locked memory (check 'ulimit -l').\n")
			exit(2)
		}
		return nil
	}
	return p
}