diff options
author | Russ Cox <rsc@golang.org> | 2014-11-11 23:00:29 -0500 |
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committer | Russ Cox <rsc@golang.org> | 2014-11-11 23:00:29 -0500 |
commit | ef35f8a674d61b2946ba2a3d4340a28b3d8ae96e (patch) | |
tree | bdba506721a2804a076a80054d9b852b00eed01c /src/runtime/mem_bsd.go | |
parent | b44834d2002225f283764d5f43651ba83a0d797d (diff) | |
download | go-ef35f8a674d61b2946ba2a3d4340a28b3d8ae96e.tar.gz |
[dev.cc] runtime: convert freebsd to Go
It builds.
Don't know if it works, but it's a lot closer than having everything in C.
LGTM=r
R=r
CC=golang-codereviews
https://codereview.appspot.com/168590043
Diffstat (limited to 'src/runtime/mem_bsd.go')
-rw-r--r-- | src/runtime/mem_bsd.go | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/src/runtime/mem_bsd.go b/src/runtime/mem_bsd.go new file mode 100644 index 000000000..fffb350ed --- /dev/null +++ b/src/runtime/mem_bsd.go @@ -0,0 +1,88 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// +build dragonfly freebsd netbsd openbsd + +package runtime + +import "unsafe" + +//go:nosplit +func sysAlloc(n uintptr, stat *uint64) unsafe.Pointer { + v := unsafe.Pointer(mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)) + if uintptr(v) < 4096 { + return nil + } + xadd64(stat, int64(n)) + return v +} + +func sysUnused(v unsafe.Pointer, n uintptr) { + madvise(v, n, _MADV_FREE) +} + +func sysUsed(v unsafe.Pointer, n uintptr) { +} + +func sysFree(v unsafe.Pointer, n uintptr, stat *uint64) { + xadd64(stat, -int64(n)) + munmap(v, n) +} + +func sysFault(v unsafe.Pointer, n uintptr) { + mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE|_MAP_FIXED, -1, 0) +} + +func sysReserve(v unsafe.Pointer, n uintptr, reserved *bool) unsafe.Pointer { + // On 64-bit, people with ulimit -v set complain if we reserve too + // much address space. Instead, assume that the reservation is okay + // and check the assumption in SysMap. + if ptrSize == 8 && uint64(n) > 1<<32 { + *reserved = false + return v + } + + p := unsafe.Pointer(mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE, -1, 0)) + if uintptr(p) < 4096 { + return nil + } + *reserved = true + return p +} + +func sysMap(v unsafe.Pointer, n uintptr, reserved bool, stat *uint64) { + const _ENOMEM = 12 + + xadd64(stat, int64(n)) + + // On 64-bit, we don't actually have v reserved, so tread carefully. + if !reserved { + flags := int32(_MAP_ANON | _MAP_PRIVATE) + if GOOS == "dragonfly" { + // TODO(jsing): For some reason DragonFly seems to return + // memory at a different address than we requested, even when + // there should be no reason for it to do so. This can be + // avoided by using MAP_FIXED, but I'm not sure we should need + // to do this - we do not on other platforms. + flags |= _MAP_FIXED + } + p := mmap(v, n, _PROT_READ|_PROT_WRITE, flags, -1, 0) + if uintptr(p) == _ENOMEM { + gothrow("runtime: out of memory") + } + if p != v { + print("runtime: address space conflict: map(", v, ") = ", p, "\n") + gothrow("runtime: address space conflict") + } + return + } + + p := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0) + if uintptr(p) == _ENOMEM { + gothrow("runtime: out of memory") + } + if p != v { + gothrow("runtime: cannot map pages in arena address space") + } +} |