github.com/razvanm/vanadium-go-1.3@v0.0.0-20160721203343-4a65068e5915/src/runtime/mem_dragonfly.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 enum 13 { 14 ENOMEM = 12, 15 }; 16 17 #pragma textflag NOSPLIT 18 void* 19 runtime·sysAlloc(uintptr n, uint64 *stat) 20 { 21 void *v; 22 23 v = runtime·mmap(nil, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0); 24 if(v < (void*)4096) 25 return nil; 26 runtime·xadd64(stat, n); 27 return v; 28 } 29 30 void 31 runtime·SysUnused(void *v, uintptr n) 32 { 33 runtime·madvise(v, n, MADV_FREE); 34 } 35 36 void 37 runtime·SysUsed(void *v, uintptr n) 38 { 39 USED(v); 40 USED(n); 41 } 42 43 void 44 runtime·SysFree(void *v, uintptr n, uint64 *stat) 45 { 46 runtime·xadd64(stat, -(uint64)n); 47 runtime·munmap(v, n); 48 } 49 50 void 51 runtime·SysFault(void *v, uintptr n) 52 { 53 runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0); 54 } 55 56 void* 57 runtime·SysReserve(void *v, uintptr n, bool *reserved) 58 { 59 void *p; 60 61 // On 64-bit, people with ulimit -v set complain if we reserve too 62 // much address space. Instead, assume that the reservation is okay 63 // and check the assumption in SysMap. 64 if(sizeof(void*) == 8 && n > 1LL<<32) { 65 *reserved = false; 66 return v; 67 } 68 69 *reserved = true; 70 p = runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0); 71 if(p < (void*)4096) 72 return nil; 73 return p; 74 } 75 76 void 77 runtime·SysMap(void *v, uintptr n, bool reserved, uint64 *stat) 78 { 79 void *p; 80 81 runtime·xadd64(stat, n); 82 83 // On 64-bit, we don't actually have v reserved, so tread carefully. 84 if(!reserved) { 85 // TODO(jsing): For some reason DragonFly seems to return 86 // memory at a different address than we requested, even when 87 // there should be no reason for it to do so. This can be 88 // avoided by using MAP_FIXED, but I'm not sure we should need 89 // to do this - we do not on other platforms. 90 p = runtime·mmap(v, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0); 91 if(p == (void*)ENOMEM) 92 runtime·throw("runtime: out of memory"); 93 if(p != v) { 94 runtime·printf("runtime: address space conflict: map(%p) = %p\n", v, p); 95 runtime·throw("runtime: address space conflict"); 96 } 97 return; 98 } 99 100 p = runtime·mmap(v, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0); 101 if(p == (void*)ENOMEM) 102 runtime·throw("runtime: out of memory"); 103 if(p != v) 104 runtime·throw("runtime: cannot map pages in arena address space"); 105 }