github.com/razvanm/vanadium-go-1.3@v0.0.0-20160721203343-4a65068e5915/src/runtime/mem_darwin.c (about) 1 // Copyright 2010 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 #include "runtime.h" 6 #include "arch_GOARCH.h" 7 #include "defs_GOOS_GOARCH.h" 8 #include "os_GOOS.h" 9 #include "malloc.h" 10 #include "textflag.h" 11 12 #pragma textflag NOSPLIT 13 void* 14 runtime·sysAlloc(uintptr n, uint64 *stat) 15 { 16 void *v; 17 18 v = runtime·mmap(nil, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0); 19 if(v < (void*)4096) 20 return nil; 21 runtime·xadd64(stat, n); 22 return v; 23 } 24 25 void 26 runtime·SysUnused(void *v, uintptr n) 27 { 28 // Linux's MADV_DONTNEED is like BSD's MADV_FREE. 29 runtime·madvise(v, n, MADV_FREE); 30 } 31 32 void 33 runtime·SysUsed(void *v, uintptr n) 34 { 35 USED(v); 36 USED(n); 37 } 38 39 void 40 runtime·SysFree(void *v, uintptr n, uint64 *stat) 41 { 42 runtime·xadd64(stat, -(uint64)n); 43 runtime·munmap(v, n); 44 } 45 46 void 47 runtime·SysFault(void *v, uintptr n) 48 { 49 runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0); 50 } 51 52 void* 53 runtime·SysReserve(void *v, uintptr n, bool *reserved) 54 { 55 void *p; 56 57 *reserved = true; 58 p = runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0); 59 if(p < (void*)4096) 60 return nil; 61 return p; 62 } 63 64 enum 65 { 66 ENOMEM = 12, 67 }; 68 69 void 70 runtime·SysMap(void *v, uintptr n, bool reserved, uint64 *stat) 71 { 72 void *p; 73 74 USED(reserved); 75 76 runtime·xadd64(stat, n); 77 p = runtime·mmap(v, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0); 78 if(p == (void*)ENOMEM) 79 runtime·throw("runtime: out of memory"); 80 if(p != v) 81 runtime·throw("runtime: cannot map pages in arena address space"); 82 }