| // 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 |
| { |
| ENOMEM = 12, |
| }; |
| |
| void* |
| runtime·SysAlloc(uintptr n, uint64 *stat) |
| { |
| void *v; |
| |
| v = runtime·mmap(nil, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0); |
| if(v < (void*)4096) |
| return nil; |
| runtime·xadd64(stat, n); |
| return v; |
| } |
| |
| void |
| runtime·SysUnused(void *v, uintptr n) |
| { |
| runtime·madvise(v, n, MADV_FREE); |
| } |
| |
| void |
| runtime·SysUsed(void *v, uintptr n) |
| { |
| USED(v); |
| USED(n); |
| } |
| |
| void |
| runtime·SysFree(void *v, uintptr n, uint64 *stat) |
| { |
| runtime·xadd64(stat, -(uint64)n); |
| runtime·munmap(v, n); |
| } |
| |
| void |
| runtime·SysFault(void *v, uintptr n) |
| { |
| runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0); |
| } |
| |
| void* |
| runtime·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(sizeof(void*) == 8 && n > 1LL<<32) { |
| *reserved = false; |
| return v; |
| } |
| |
| *reserved = true; |
| p = runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0); |
| if(p < (void*)4096) |
| return nil; |
| return p; |
| } |
| |
| void |
| runtime·SysMap(void *v, uintptr n, bool reserved, uint64 *stat) |
| { |
| void *p; |
| |
| runtime·xadd64(stat, n); |
| |
| // On 64-bit, we don't actually have v reserved, so tread carefully. |
| if(!reserved) { |
| // 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. |
| p = runtime·mmap(v, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_FIXED|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, 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"); |
| } |