config/kernel-objtool.m4

   1 dnl #
   2 dnl # Detect objtool functionality.
   3 dnl #
   4
   5 dnl #
   6 dnl # Kernel 5.10: linux/frame.h was renamed linux/objtool.h
   7 dnl #
   8 AC_DEFUN([ZFS_AC_KERNEL_OBJTOOL_HEADER], [
   9         AC_MSG_CHECKING([whether objtool header is available])
  10         ZFS_LINUX_TRY_COMPILE([
  11                 #include <linux/objtool.h>
  12         ],[
  13         ],[
  14                 AC_DEFINE(HAVE_KERNEL_OBJTOOL_HEADER, 1,
  15                     [kernel has linux/objtool.h])
  16                 AC_MSG_RESULT(linux/objtool.h)
  17         ],[
  18                 AC_MSG_RESULT(linux/frame.h)
  19         ])
  20 ])
  21
  22 dnl #
  23 dnl # Check for objtool support.
  24 dnl #
  25 AC_DEFUN([ZFS_AC_KERNEL_SRC_OBJTOOL], [
  26
  27         dnl # 4.6 API for compile-time stack validation
  28         ZFS_LINUX_TEST_SRC([objtool], [
  29                 #undef __ASSEMBLY__
  30                 #include <asm/ptrace.h>
  31                 #include <asm/frame.h>
  32         ],[
  33                 #if !defined(FRAME_BEGIN)
  34                 #error "FRAME_BEGIN is not defined"
  35                 #endif
  36         ])
  37
  38         dnl # 4.6 API added STACK_FRAME_NON_STANDARD macro
  39         ZFS_LINUX_TEST_SRC([stack_frame_non_standard], [
  40                 #ifdef HAVE_KERNEL_OBJTOOL_HEADER
  41                 #include <linux/objtool.h>
  42                 #else
  43                 #include <linux/frame.h>
  44                 #endif
  45         ],[
  46                 #if !defined(STACK_FRAME_NON_STANDARD)
  47                 #error "STACK_FRAME_NON_STANDARD is not defined."
  48                 #endif
  49         ])
  50 ])
  51
  52 AC_DEFUN([ZFS_AC_KERNEL_OBJTOOL], [
  53         AC_MSG_CHECKING(
  54             [whether compile-time stack validation (objtool) is available])
  55         ZFS_LINUX_TEST_RESULT([objtool], [
  56                 AC_MSG_RESULT(yes)
  57                 AC_DEFINE(HAVE_KERNEL_OBJTOOL, 1,
  58                     [kernel does stack verification])
  59
  60                 AC_MSG_CHECKING([whether STACK_FRAME_NON_STANDARD is defined])
  61                 ZFS_LINUX_TEST_RESULT([stack_frame_non_standard], [
  62                         AC_MSG_RESULT(yes)
  63                         AC_DEFINE(HAVE_STACK_FRAME_NON_STANDARD, 1,
  64                            [STACK_FRAME_NON_STANDARD is defined])
  65                 ],[
  66                         AC_MSG_RESULT(no)
  67                 ])
  68         ],[
  69                 AC_MSG_RESULT(no)
  70         ])
  71 ])