| #include "runtime.h" |
| #include "defs.h" |
| #include "os.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"); |
| } |