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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build amd64 || arm64
package main
import "unsafe"
func init() {
register("FramePointerAdjust", FramePointerAdjust)
}
func FramePointerAdjust() { framePointerAdjust1(0) }
//go:noinline
func framePointerAdjust1(x int) {
argp := uintptr(unsafe.Pointer(&x))
fp := *getFP()
if !(argp-0x100 <= fp && fp <= argp+0x100) {
print("saved FP=", fp, " &x=", argp, "\n")
panic("FAIL")
}
// grow the stack
grow(10000)
// check again
argp = uintptr(unsafe.Pointer(&x))
fp = *getFP()
if !(argp-0x100 <= fp && fp <= argp+0x100) {
print("saved FP=", fp, " &x=", argp, "\n")
panic("FAIL")
}
}
func grow(n int) {
if n > 0 {
grow(n - 1)
}
}
func getFP() *uintptr
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