root/src/pkg/runtime/mem_nacl.c

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DEFINITIONS

This source file includes following definitions.
  1. runtimeツキSysAlloc
  2. runtimeツキSysUnused
  3. runtimeツキSysUsed
  4. runtimeツキSysFree
  5. runtimeツキSysFault
  6. runtimeツキSysReserve
  7. runtimeツキSysMap

// 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"

enum
{
        Debug = 0,
};

void*
runtimeツキSysAlloc(uintptr n, uint64 *stat)
{
        void *v;

        v = runtimeツキmmap(nil, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
        if(v < (void*)4096) {
                if(Debug)
                        runtimeツキprintf("SysAlloc(%p): %p\n", n, v);
                return nil;
        }
        runtimeツキxadd64(stat, n);
        if(Debug)
                runtimeツキprintf("SysAlloc(%p) = %p\n", n, v);
        return v;
}

void
runtimeツキSysUnused(void *v, uintptr n)
{
        if(Debug)
                runtimeツキprintf("SysUnused(%p, %p)\n", v, n);
}

void
runtimeツキSysUsed(void *v, uintptr n)
{
        USED(v);
        USED(n);
}

void
runtimeツキSysFree(void *v, uintptr n, uint64 *stat)
{
        if(Debug)
                runtimeツキprintf("SysFree(%p, %p)\n", v, n);
        runtimeツキxadd64(stat, -(uint64)n);
        runtimeツキmunmap(v, n);
}

void
runtimeツキSysFault(void *v, uintptr n)
{
        runtimeツキmmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0);
}

void*
runtimeツキSysReserve(void *v, uintptr n, bool *reserved)
{
        void *p;

        // 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(NaCl || sizeof(void*) == 8) {
                *reserved = false;
                return v;
        }
        
        p = runtimeツキmmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
        if(p < (void*)4096)
                return nil;
        *reserved = true;
        return p;
}

void
runtimeツキSysMap(void *v, uintptr n, bool reserved, uint64 *stat)
{
        void *p;
        
        runtimeツキxadd64(stat, n);

        // On 64-bit, we don't actually have v reserved, so tread carefully.
        if(!reserved) {
                p = runtimeツキmmap(v, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
                if(p == (void*)ENOMEM) {
                        runtimeツキprintf("SysMap(%p, %p): %p\n", v, n, p);
                        runtimeツキthrow("runtime: out of memory");
                }
                if(p != v) {
                        runtimeツキprintf("SysMap(%p, %p): %p\n", v, n, p);
                        runtimeツキprintf("runtime: address space conflict: map(%p) = %p\n", v, p);
                        runtimeツキthrow("runtime: address space conflict");
                }
                if(Debug)
                        runtimeツキprintf("SysMap(%p, %p) = %p\n", v, n, p);
                return;
        }

        p = runtimeツキmmap(v, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0);
        if(p == (void*)ENOMEM) {
                runtimeツキprintf("SysMap(%p, %p): %p\n", v, n, p);
                runtimeツキthrow("runtime: out of memory");
        }
        if(p != v) {
                runtimeツキprintf("SysMap(%p, %p): %p\n", v, n, p);
                runtimeツキprintf("mmap MAP_FIXED %p returned %p\n", v, p);
                runtimeツキthrow("runtime: cannot map pages in arena address space");
        }
        if(Debug)
                runtimeツキprintf("SysMap(%p, %p) = %p\n", v, n, p);
}

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