zircon/kernel/lib/userboot/BUILD.gn

# Copyright 2019 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import("$zx/kernel/lib/vdso/rodso.gni")

source_set("userboot") {
  sources = [
    "userboot.cpp",
  ]
  include_dirs = [ target_gen_dir ]
  deps = [
    ":gen-userboot-code-header",
    ":image",
    "$zx/kernel/lib/console",
    "$zx/kernel/lib/counters",
    "$zx/kernel/lib/vdso",
    "$zx/kernel/vm",
    "$zx/system/ulib/elf-psabi",
    "$zx/system/ulib/zircon-internal",
  ]
}

# The userboot-code.h generated header file tells the userboot.cpp code
# where the segment boundaries and entry points are.
rodso_code_header("gen-userboot-code-header") {
  visibility = [ ":*" ]
  name = "USERBOOT"
  outputs = [
    "$target_gen_dir/userboot-code.h",
  ]
  deps = [
    "user",
  ]
}

# The generated header is also needed to tell .incbin how much of the
# image file to embed (see $zx/kernel/lib/vdso/include/lib/rodso-asm.h).
source_set("image") {
  visibility = [ ":*" ]
  sources = [
    "userboot-image.S",
  ]
  include_dirs = [ target_gen_dir ]
  deps = [
    ":gen-userboot-code-header",
    "$zx/kernel/lib/vdso",
  ]

  # userboot-image.S includes the userboot contents and so must be
  # reassembled when that changes.  We can't express that in $inputs
  # here because we don't know the exact name of the file since that
  # depends on the toolchain selected.  Fortunately, we already depend
  # on the generated userboot-code.h header, which is always
  # regenerated whenever the userboot binary itself changes.  So this
  # indirect dependency is sufficient.
}