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// 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.
#include "runtime.h"
#include "arch_GOARCH.h"
#include "defs_GOOS_GOARCH.h"
#include "os_GOOS.h"
#include "malloc.h"
void*
runtime·SysAlloc(uintptr n)
{
void *v;
mstats.sys += n;
v = runtime·mmap(nil, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
if(v < (void*)4096)
return nil;
return v;
}
void
runtime·SysUnused(void *v, uintptr n)
{
USED(v);
USED(n);
// TODO(rsc): call madvise MADV_DONTNEED
}
void
runtime·SysFree(void *v, uintptr n)
{
mstats.sys -= n;
runtime·munmap(v, n);
}
void*
runtime·SysReserve(void *v, uintptr n)
{
// 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(sizeof(void*) == 8)
return v;
return runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
}
enum
{
ENOMEM = 12,
};
void
runtime·SysMap(void *v, uintptr n)
{
void *p;
mstats.sys += n;
// On 64-bit, we don't actually have v reserved, so tread carefully.
if(sizeof(void*) == 8) {
p = runtime·mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
if(p == (void*)-ENOMEM)
runtime·throw("runtime: out of memory");
if(p != v) {
runtime·printf("runtime: address space conflict: map(%p) = %p\n", v, p);
runtime·throw("runtime: address space conflict");
}
return;
}
p = runtime·mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0);
if(p == (void*)-ENOMEM)
runtime·throw("runtime: out of memory");
if(p != v)
runtime·throw("runtime: cannot map pages in arena address space");
}
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