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# This file is from Google Performance Tools, svn revision r226.
#
# The Google Performance Tools license is:
########
# Copyright (c) 2005, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
########
# Original file follows below.
# We want to access the "PC" (Program Counter) register from a struct
# ucontext. Every system has its own way of doing that. We try all the
# possibilities we know about. Note REG_PC should come first (REG_RIP
# is also defined on solaris, but does the wrong thing).
# OpenBSD doesn't have ucontext.h, but we can get PC from ucontext_t
# by using signal.h.
# The first argument of AC_PC_FROM_UCONTEXT will be invoked when we
# cannot find a way to obtain PC from ucontext.
AC_DEFUN([AC_PC_FROM_UCONTEXT],
[AC_CHECK_HEADERS(ucontext.h)
# Redhat 7 has <sys/ucontext.h>, but it barfs if we #include it directly
# (this was fixed in later redhats). <ucontext.h> works fine, so use that.
if grep "Red Hat Linux release 7" /etc/redhat-release >/dev/null 2>&1; then
AC_DEFINE(HAVE_SYS_UCONTEXT_H, 0, [<sys/ucontext.h> is broken on redhat 7])
ac_cv_header_sys_ucontext_h=no
else
AC_CHECK_HEADERS(sys/ucontext.h) # ucontext on OS X 10.6 (at least)
fi
AC_CHECK_HEADERS(cygwin/signal.h) # ucontext on cygwin
AC_MSG_CHECKING([how to access the program counter from a struct ucontext])
pc_fields=" uc_mcontext.gregs[[REG_PC]]" # Solaris x86 (32 + 64 bit)
pc_fields="$pc_fields uc_mcontext.gregs[[REG_EIP]]" # Linux (i386)
pc_fields="$pc_fields uc_mcontext.gregs[[REG_RIP]]" # Linux (x86_64)
pc_fields="$pc_fields uc_mcontext.sc_ip" # Linux (ia64)
pc_fields="$pc_fields uc_mcontext.uc_regs->gregs[[PT_NIP]]" # Linux (ppc)
pc_fields="$pc_fields uc_mcontext.gregs[[R15]]" # Linux (arm old [untested])
pc_fields="$pc_fields uc_mcontext.arm_pc" # Linux (arm arch 5)
pc_fields="$pc_fields uc_mcontext.gp_regs[[PT_NIP]]" # Suse SLES 11 (ppc64)
pc_fields="$pc_fields uc_mcontext.mc_eip" # FreeBSD (i386)
pc_fields="$pc_fields uc_mcontext.mc_rip" # FreeBSD (x86_64 [untested])
pc_fields="$pc_fields uc_mcontext.__gregs[[_REG_EIP]]" # NetBSD (i386)
pc_fields="$pc_fields uc_mcontext.__gregs[[_REG_RIP]]" # NetBSD (x86_64)
pc_fields="$pc_fields uc_mcontext->ss.eip" # OS X (i386, <=10.4)
pc_fields="$pc_fields uc_mcontext->__ss.__eip" # OS X (i386, >=10.5)
pc_fields="$pc_fields uc_mcontext->ss.rip" # OS X (x86_64)
pc_fields="$pc_fields uc_mcontext->__ss.__rip" # OS X (>=10.5 [untested])
pc_fields="$pc_fields uc_mcontext->ss.srr0" # OS X (ppc, ppc64 [untested])
pc_fields="$pc_fields uc_mcontext->__ss.__srr0" # OS X (>=10.5 [untested])
pc_field_found=false
for pc_field in $pc_fields; do
if ! $pc_field_found; then
# Prefer sys/ucontext.h to ucontext.h, for OS X's sake.
if test "x$ac_cv_header_cygwin_signal_h" = xyes; then
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <cygwin/signal.h>]],
[[ucontext_t u; return u.$pc_field == 0;]])],
AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
How to access the PC from a struct ucontext)
AC_MSG_RESULT([$pc_field])
pc_field_found=true)
elif test "x$ac_cv_header_sys_ucontext_h" = xyes; then
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/ucontext.h>]],
[[ucontext_t u; return u.$pc_field == 0;]])],
AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
How to access the PC from a struct ucontext)
AC_MSG_RESULT([$pc_field])
pc_field_found=true)
elif test "x$ac_cv_header_ucontext_h" = xyes; then
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <ucontext.h>]],
[[ucontext_t u; return u.$pc_field == 0;]])],
AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
How to access the PC from a struct ucontext)
AC_MSG_RESULT([$pc_field])
pc_field_found=true)
else # hope some standard header gives it to us
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],
[[ucontext_t u; return u.$pc_field == 0;]])],
AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
How to access the PC from a struct ucontext)
AC_MSG_RESULT([$pc_field])
pc_field_found=true)
fi
fi
done
if ! $pc_field_found; then
pc_fields=" sc_eip" # OpenBSD (i386)
pc_fields="$pc_fields sc_rip" # OpenBSD (x86_64)
for pc_field in $pc_fields; do
if ! $pc_field_found; then
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <signal.h>]],
[[ucontext_t u; return u.$pc_field == 0;]])],
AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
How to access the PC from a struct ucontext)
AC_MSG_RESULT([$pc_field])
pc_field_found=true)
fi
done
fi
if ! $pc_field_found; then
[$1]
fi])
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