github.com/flyinox/gosm@v0.0.0-20171117061539-16768cb62077/src/runtime/cgo/signal_darwin_armx.go (about)

     1  // Copyright 2015 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  // +build darwin
     6  // +build arm arm64
     7  
     8  package cgo
     9  
    10  import "unsafe"
    11  
    12  //go:cgo_import_static x_cgo_panicmem
    13  //go:linkname x_cgo_panicmem x_cgo_panicmem
    14  var x_cgo_panicmem uintptr
    15  
    16  // use a pointer to avoid relocation of external symbol in __TEXT
    17  // make linker happy
    18  var _cgo_panicmem = &x_cgo_panicmem
    19  
    20  // TODO(crawshaw): move this into x_cgo_init, it will not run until
    21  // runtime has finished loading, which may be after its use.
    22  func init() {
    23  	*_cgo_panicmem = funcPC(panicmem)
    24  }
    25  
    26  func funcPC(f interface{}) uintptr {
    27  	var ptrSize = unsafe.Sizeof(uintptr(0))
    28  	return **(**uintptr)(add(unsafe.Pointer(&f), ptrSize))
    29  }
    30  
    31  func add(p unsafe.Pointer, x uintptr) unsafe.Pointer {
    32  	return unsafe.Pointer(uintptr(p) + x)
    33  }
    34  
    35  func panicmem()