# 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 , but it barfs if we #include it directly # (this was fixed in later redhats). 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, [ 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 cywgin 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 ]], [[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$ac_cv_header_sys_ucontext_h" = xyes; then AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include ]], [[ucontext_t u; return u.$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$ac_cv_header_ucontext_h" = xyes; then AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include ]], [[ucontext_t u; return u.$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 ! $pc_field_found; then AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include ]], [[ucontext_t u; return u.$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])