122 lines
3.7 KiB
Plaintext
122 lines
3.7 KiB
Plaintext
$OpenBSD: patch-src_runtime_mem_openbsd_go,v 1.1 2018/04/05 18:38:38 jsing Exp $
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Index: src/runtime/mem_openbsd.go
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--- src/runtime/mem_openbsd.go.orig
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+++ src/runtime/mem_openbsd.go
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@@ -0,0 +1,115 @@
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+// Copyright 2010 The Go Authors. All rights reserved.
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+// Use of this source code is governed by a BSD-style
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+// license that can be found in the LICENSE file.
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+
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+package runtime
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+
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+import (
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+ "runtime/internal/sys"
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+ "unsafe"
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+)
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+
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+// Don't split the stack as this function may be invoked without a valid G,
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+// which prevents us from allocating more stack.
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+//go:nosplit
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+func sysAlloc(n uintptr, sysStat *uint64) unsafe.Pointer {
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+ v, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
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+ if err != 0 {
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+ return nil
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+ }
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+ mSysStatInc(sysStat, n)
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+ return v
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+}
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+
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+// Don't split the stack as this function may be invoked without a valid G,
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+// which prevents us from allocating more stack.
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+//go:nosplit
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+func sysMarkStack(v unsafe.Pointer, n uintptr) {
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+ p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_FIXED|_MAP_ANON|_MAP_PRIVATE|_MAP_STACK, -1, 0)
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+ if err != 0 || p != v {
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+ throw("runtime: failed to mark stack")
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+ }
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+}
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+
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+// Don't split the stack as this function may be invoked without a valid G,
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+// which prevents us from allocating more stack.
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+//go:nosplit
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+func sysUnmarkStack(v unsafe.Pointer, n uintptr) {
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+ p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_FIXED|_MAP_ANON|_MAP_PRIVATE, -1, 0)
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+ if err != 0 || p != v {
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+ throw("runtime: failed to unmark stack")
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+ }
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+}
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+
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+func sysUnused(v unsafe.Pointer, n uintptr) {
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+ madvise(v, n, _MADV_FREE)
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+}
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+
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+func sysUsed(v unsafe.Pointer, n uintptr) {
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+}
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+
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+// Don't split the stack as this function may be invoked without a valid G,
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+// which prevents us from allocating more stack.
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+//go:nosplit
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+func sysFree(v unsafe.Pointer, n uintptr, sysStat *uint64) {
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+ mSysStatDec(sysStat, n)
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+ munmap(v, n)
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+}
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+
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+func sysFault(v unsafe.Pointer, n uintptr) {
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+ mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE|_MAP_FIXED, -1, 0)
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+}
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+
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+func sysReserve(v unsafe.Pointer, n uintptr, reserved *bool) unsafe.Pointer {
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+ // On 64-bit, people with ulimit -v set complain if we reserve too
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+ // much address space. Instead, assume that the reservation is okay
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+ // and check the assumption in SysMap.
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+ if sys.PtrSize == 8 && uint64(n) > 1<<32 || sys.GoosNacl != 0 {
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+ *reserved = false
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+ return v
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+ }
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+
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+ p, err := mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
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+ if err != 0 {
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+ return nil
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+ }
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+ *reserved = true
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+ return p
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+}
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+
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+const _sunosEAGAIN = 11
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+const _ENOMEM = 12
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+
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+func sysMap(v unsafe.Pointer, n uintptr, reserved bool, sysStat *uint64) {
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+ mSysStatInc(sysStat, n)
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+
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+ // On 64-bit, we don't actually have v reserved, so tread carefully.
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+ if !reserved {
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+ flags := int32(_MAP_ANON | _MAP_PRIVATE)
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+ if GOOS == "dragonfly" {
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+ // TODO(jsing): For some reason DragonFly seems to return
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+ // memory at a different address than we requested, even when
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+ // there should be no reason for it to do so. This can be
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+ // avoided by using MAP_FIXED, but I'm not sure we should need
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+ // to do this - we do not on other platforms.
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+ flags |= _MAP_FIXED
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+ }
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+ p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, flags, -1, 0)
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+ if err == _ENOMEM || (GOOS == "solaris" && err == _sunosEAGAIN) {
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+ throw("runtime: out of memory")
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+ }
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+ if p != v || err != 0 {
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+ print("runtime: address space conflict: map(", v, ") = ", p, "(err ", err, ")\n")
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+ throw("runtime: address space conflict")
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+ }
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+ return
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+ }
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+
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+ p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0)
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+ if err == _ENOMEM || (GOOS == "solaris" && err == _sunosEAGAIN) {
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+ throw("runtime: out of memory")
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+ }
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+ if p != v || err != 0 {
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+ throw("runtime: cannot map pages in arena address space")
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+ }
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+}
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