github.com/mtsmfm/go/src@v0.0.0-20221020090648-44bdcb9f8fde/runtime/mem_aix.go (about) 1 // Copyright 2018 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 package runtime 6 7 import ( 8 "unsafe" 9 ) 10 11 // Don't split the stack as this method may be invoked without a valid G, which 12 // prevents us from allocating more stack. 13 // 14 //go:nosplit 15 func sysAllocOS(n uintptr) unsafe.Pointer { 16 p, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0) 17 if err != 0 { 18 if err == _EACCES { 19 print("runtime: mmap: access denied\n") 20 exit(2) 21 } 22 if err == _EAGAIN { 23 print("runtime: mmap: too much locked memory (check 'ulimit -l').\n") 24 exit(2) 25 } 26 return nil 27 } 28 return p 29 } 30 31 func sysUnusedOS(v unsafe.Pointer, n uintptr) { 32 madvise(v, n, _MADV_DONTNEED) 33 } 34 35 func sysUsedOS(v unsafe.Pointer, n uintptr) { 36 } 37 38 func sysHugePageOS(v unsafe.Pointer, n uintptr) { 39 } 40 41 // Don't split the stack as this function may be invoked without a valid G, 42 // which prevents us from allocating more stack. 43 // 44 //go:nosplit 45 func sysFreeOS(v unsafe.Pointer, n uintptr) { 46 munmap(v, n) 47 } 48 49 func sysFaultOS(v unsafe.Pointer, n uintptr) { 50 mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE|_MAP_FIXED, -1, 0) 51 } 52 53 func sysReserveOS(v unsafe.Pointer, n uintptr) unsafe.Pointer { 54 p, err := mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE, -1, 0) 55 if err != 0 { 56 return nil 57 } 58 return p 59 } 60 61 func sysMapOS(v unsafe.Pointer, n uintptr) { 62 // AIX does not allow mapping a range that is already mapped. 63 // So, call mprotect to change permissions. 64 // Note that sysMap is always called with a non-nil pointer 65 // since it transitions a Reserved memory region to Prepared, 66 // so mprotect is always possible. 67 _, err := mprotect(v, n, _PROT_READ|_PROT_WRITE) 68 if err == _ENOMEM { 69 throw("runtime: out of memory") 70 } 71 if err != 0 { 72 print("runtime: mprotect(", v, ", ", n, ") returned ", err, "\n") 73 throw("runtime: cannot map pages in arena address space") 74 } 75 }