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configure.ac
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configure.ac
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dnl Autoconf configuration for libsigsegv.
dnl Process this file with autoconf to produce a configure script.
dnl
dnl Copyright (C) 2002-2023 Bruno Haible <[email protected]>
dnl
dnl This program is free software: you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2 of the License, or
dnl (at your option) any later version.
dnl
dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program. If not, see <https://www.gnu.org/licenses/>.
AC_PREREQ([2.64])
AC_INIT([libsigsegv], [2.14])
AC_CONFIG_SRCDIR([src/sigsegv.h.in])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIRS([m4])
AC_CONFIG_HEADERS([config.h])
RSE_BOLD
{ echo; echo "${term_bold}Build Tools:${term_norm}"; } >& AS_MESSAGE_FD
AM_INIT_AUTOMAKE
dnl Override automake's tar command used for creating distributions.
am__tar='${AMTAR} chf - --owner=root --group=root "$$tardir"'
AC_PROG_CC
AC_PROG_CPP
AC_CANONICAL_HOST
dnl ========================== Determine PLATFORM ==========================
dnl Requires AC_CANONICAL_HOST.
dnl PLATFORM is a modified config.guess triple that is supposed to contain
dnl the bits of information which influence the configuration or functioning
dnl of catching faults.
AC_MSG_CHECKING([host platform])
sv_cv_host="$host"
changequote(,)dnl Autoconf 2.52 brokenness
case "$host_os" in
linux | linux-*)
kernelversion=`uname -r | sed -e 's/^\([0-9.]*\).*/\1/'`
sv_cv_host=`echo $sv_cv_host | sed -e "s/linux/linux$kernelversion/"`
;;
esac
changequote([,])dnl Autoconf 2.52 brokenness
cat > conftest.c << EOF
#include <features.h>
#ifdef __GNU_LIBRARY__
Version __GLIBC__ . __GLIBC_MINOR__
#endif
EOF
dnl We cannot simply use 'grep Version' on the output; see
dnl https://lists.gnu.org/archive/html/bug-autoconf/2017-02/msg00001.html
sed_extract_lines_after_version='/Version/{
:a
p
n
ba
}'
glibcversion=`$CPP $CPPFLAGS conftest.c 2>/dev/null | sed -e '/^#/d' | sed -n -e "$sed_extract_lines_after_version" | tr -d '\n' | sed -e 's/Version//' -e 's/ //g'`
if test -n "$glibcversion"; then
sv_cv_host="$sv_cv_host-glibc$glibcversion"
fi
AC_MSG_RESULT([$sv_cv_host])
PLATFORM="$sv_cv_host"
AC_SUBST([PLATFORM])
gl_MUSL_LIBC
dnl ========================== Done with PLATFORM ==========================
AC_PROG_INSTALL
LT_INIT([disable-shared])
# For testing cross-compilation behaviour.
#cross_compiling=yes
{ echo; echo "${term_bold}Optional Platform Environment:${term_norm}"; } >& AS_MESSAGE_FD
dnl Headers to be included with <signal.h>. On MacOS X (Darwin) one also
dnl needs <sys/signal.h>.
AC_CHECK_HEADERS([sys/signal.h])
dnl ========================== Determine CFG_SIGNALS ==========================
dnl Requires AC_CANONICAL_HOST.
dnl List of signals that are sent when an invalid virtual memory address
dnl is accessed, or when the stack overflows.
case "$host_os" in
sunos4* | freebsd* | dragonfly* | openbsd* | netbsd* | midnightbsd* | \
kfreebsd* | knetbsd*)
CFG_SIGNALS=signals-bsd.h ;;
hpux*)
CFG_SIGNALS=signals-hpux.h ;;
macos* | darwin*)
CFG_SIGNALS=signals-macos.h ;;
gnu*)
CFG_SIGNALS=signals-hurd.h ;;
*)
CFG_SIGNALS=signals.h ;;
esac
AC_DEFINE_UNQUOTED([CFG_SIGNALS], ["$CFG_SIGNALS"],
[The name of the include file describing the fault signals.])
dnl ========================== Done with CFG_SIGNALS ==========================
# How to determine the memory page size.
SV_GETPAGESIZE
# How to allocate fresh memory using mmap.
# (We need mmap, because mprotect() doesn't work on malloc()ed memory on
# some systems.)
SV_MMAP_ANON
dnl ================== Determine CFG_HANDLER partially, ==================
dnl ================== CFG_FAULT, CFG_MACHFAULT, ==================
dnl ================== FAULT_CONTEXT, FAULT_CONTEXT_INCLUDE ==================
dnl Requires AC_CANONICAL_HOST, SV_MMAP_ANON.
# How to write a SIGSEGV handler with access to the fault address.
# Cygwin >= 2.1 supports sigaltstack(). For older versions of Cygwin,
# a Windows API based handler is needed, with complex code to make EFAULT work.
# Use the simpler approach by default.
AC_ARG_ENABLE([support-old-cygwin],
[AS_HELP_STRING([--enable-support-old-cygwin],
[enable support of Cygwin older than 2.1 (2015)])])
# On MacOS X 10.2 to 10.12, we don't need these tests, because we'll end up
# using handler-macos.c anyway. If we were to perform the tests, 5 Crash Report
# dialog windows would pop up.
# Starting with MacOS X 10.13 (at least), handler-unix.c works fine too.
case "$host_os" in
macos* | darwin[[6-9]]* | darwin1[[0-6]]*) ;;
*)
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_FAULT([POSIX], sv_cv_fault_posix,
[*-*-solaris2.[7-9] | i?86-*-linux2.[4-9]* | sparc*-*-linux2.6.* | i?86-*-freebsd[4-9]* | i?86-*-freebsd[1-9][0-9]* | i?86-*-kfreebsd[4-9]* | i?86-*-kfreebsd[1-9][0-9]* | x86_64-*-kfreebsd[4-9]* | x86_64-*-kfreebsd[1-9][0-9]* | i?86-*-mirbsd1[0-9] | alpha*-dec-osf[4-9]* | *-*-hpux11* | mips-sgi-irix6*],
[],
[int sig, siginfo_t *sip, void *ucp],
[sip->si_addr],
[action.sa_sigaction = &sigsegv_handler;
action.sa_flags = SA_SIGINFO;])
SV_TRY_FAULT([Linux/i386], sv_cv_fault_linux_i386, [i?86-*-linux2.[2-9]*],
[#include <asm/sigcontext.h>],
[int sig, struct sigcontext sc],
[sc.cr2])
SV_TRY_FAULT([old Linux/i386], sv_cv_fault_linux_i386_old,
[i?86-*-linux2.[2-9]*],
[],
[int sig, unsigned int more],
[((unsigned long *) &more) [21]])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_FAULT([Linux/m68k], sv_cv_fault_linux_m68k, [],
[#include <asm/sigcontext.h>
#include "$srcdir/src/fault-linux-m68k-old.c"],
[int sig, int code, struct sigcontext *scp],
[get_fault_addr (scp)])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_FAULT([Linux/PowerPC], sv_cv_fault_linux_powerpc, [],
[#include <asm/sigcontext.h>],
[int sig, struct sigcontext *scp],
[scp->regs->dar])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_FAULT([Linux/HPPA], sv_cv_fault_linux_hppa, [],
[],
[int sig, siginfo_t *sip, void *ucp],
[sip->si_ptr],
[action.sa_sigaction = &sigsegv_handler;
action.sa_flags = SA_SIGINFO;])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_FAULT([BSD], sv_cv_fault_bsd, [i?86-*-freebsd[4-9]* | i?86-*-freebsd[1-9][0-9]* | x86_64-*-kfreebsd[4-9]* | x86_64-*-kfreebsd[1-9][0-9]*],
[],
[int sig, int code, struct sigcontext *scp, void *addr],
[addr])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_FAULT([IRIX], sv_cv_fault_irix, [mips-sgi-irix6*],
[],
[int sig, int code, struct sigcontext *scp],
[(unsigned long) scp->sc_badvaddr])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_FAULT([HP-UX HPPA], sv_cv_fault_hpux_hppa, [hppa*-*-hpux11*],
[
#define USE_64BIT_REGS(mc) \
(((mc).ss_flags & SS_WIDEREGS) && ((mc).ss_flags & SS_NARROWISINVALID))
#define GET_CR21(mc) \
(USE_64BIT_REGS(mc) ? (mc).ss_wide.ss_64.ss_cr21 : (mc).ss_narrow.ss_cr21)
],
[int sig, int code, struct sigcontext *scp],
[GET_CR21 (scp->sc_sl.sl_ss)])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_FAULT([OSF/1 Alpha], sv_cv_fault_osf_alpha,
[alpha*-*-osf[4-9]* | alpha*-*-linux2.[4-9]*],
[],
[int sig, int code, struct sigcontext *scp],
[scp->sc_traparg_a0])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_FAULT([NetBSD Alpha], sv_cv_fault_netbsd_alpha,
[alpha*-*-osf[4-9]* | alpha-*-*bsd*],
[#include "$srcdir/src/fault-netbsd-alpha.c"],
[int sig, int code, struct sigcontext *scp],
[get_fault_addr (scp)])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_FAULT([AIX], sv_cv_fault_aix, [*-*-aix[34]*],
[],
[int sig, int code, struct sigcontext *scp],
[scp->sc_jmpbuf.jmp_context.o_vaddr])
SV_TRY_FAULT([MacOSX/Darwin7 PowerPC], sv_cv_fault_macosdarwin7_ppc,
[powerpc-*-darwin7*],
[#include "$srcdir/src/fault-macosdarwin7-powerpc.c"],
[int sig, siginfo_t *sip, ucontext_t *ucp],
[get_fault_addr (sip, ucp)],
[action.sa_sigaction = (void (*) (int, siginfo_t *, void *)) &sigsegv_handler;
action.sa_flags = SA_SIGINFO;])
if test "$sv_cv_fault_macosdarwin7_ppc" != yes; then
SV_TRY_FAULT([MacOSX/Darwin5 PowerPC], sv_cv_fault_macosdarwin5_ppc,
[powerpc-*-darwin5*],
[#include "$srcdir/src/fault-macosdarwin5-powerpc.c"],
[int sig, int code, struct sigcontext *scp],
[get_fault_addr (scp)])
fi
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_FAULT([Hurd], sv_cv_fault_hurd, [],
[],
[int sig, int code, struct sigcontext *scp],
[code])
# End of MacOS X special casing.
;;
esac
dnl Now determine the fault handler include file.
dnl We prefer the platform specific include files to the generic fault-posix.h
dnl because the former often defines SIGSEGV_FAULT_STACKPOINTER.
dnl Also we put the BSD test second-to-last, because the test may produce
dnl false positives.
CFG_HANDLER=
CFG_FAULT=
CFG_MACHFAULT=
FAULT_CONTEXT=void
FAULT_CONTEXT_INCLUDE=
dnl
dnl First the cases where the OS provides the fault address.
dnl
if test -z "$CFG_FAULT" && test "$sv_cv_fault_aix" = yes; then
case "$host_cpu" in
powerpc* | rs6000) CFG_FAULT=fault-aix3-powerpc.h ;;
*) CFG_FAULT=fault-aix3.h ;;
esac
FAULT_CONTEXT='struct sigcontext'
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_irix" = yes; then
case "$host_cpu" in
mips*) CFG_FAULT=fault-irix-mips.h ;;
*) CFG_FAULT=fault-irix.h ;;
esac
FAULT_CONTEXT='struct sigcontext'
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_hpux_hppa" = yes; then
case "$host_cpu" in
hppa* | parisc*) CFG_FAULT=fault-hpux-hppa.h ;;
*) CFG_FAULT=fault-hpux.h ;;
esac
FAULT_CONTEXT='struct sigcontext'
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_osf_alpha" = yes; then
case "$host_cpu" in
alpha*) CFG_FAULT=fault-osf-alpha.h ;;
*) CFG_FAULT=fault-osf.h ;;
esac
FAULT_CONTEXT='struct sigcontext'
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_netbsd_alpha" = yes; then
case "$host_cpu" in
alpha*) CFG_FAULT=fault-netbsd-alpha.h ;;
esac
FAULT_CONTEXT='struct sigcontext'
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_hurd" = yes; then
case "$host_os" in
gnu*)
# Test $sv_cv_fault_hurd before testing $sv_cv_fault_posix, because
# support for SA_SIGINFO in Hurd is present only in upstream glibc ≥ 2.33
# or in Debian glibc ≥ 2.19.
case "$host_cpu" in
i?86 | x86_64)
CFG_FAULT=fault-hurd-i386-old.h
;;
*)
CFG_FAULT=fault-hurd.h
;;
esac
FAULT_CONTEXT='struct sigcontext'
;;
esac
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_bsd" = yes; then
case "$host_os" in
freebsd* | dragonfly* | kfreebsd*)
case "$host_cpu" in
i?86 | x86_64)
CFG_FAULT=fault-freebsd-i386.h
FAULT_CONTEXT='struct sigcontext'
;;
*)
CFG_FAULT=fault-bsd.h
FAULT_CONTEXT='void'
;;
esac
;;
*)
CFG_FAULT=fault-bsd.h
FAULT_CONTEXT='void'
;;
esac
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_posix" = yes; then
case "$host_os" in
openbsd*)
case "$host_cpu" in
alpha*) CFG_FAULT=fault-openbsd-alpha.h ;;
arm* | strongarm* | xscale*) CFG_FAULT=fault-openbsd-arm.h ;;
hppa* | parisc*) CFG_FAULT=fault-openbsd-hppa.h ;;
i?86 | x86_64) CFG_FAULT=fault-openbsd-i386.h ;;
m68*) CFG_FAULT=fault-openbsd-m68k.h ;;
m88k*) CFG_FAULT=fault-openbsd-m88k.h ;;
mips*) CFG_FAULT=fault-openbsd-mips.h ;;
powerpc* | rs6000) CFG_FAULT=fault-openbsd-powerpc.h ;;
sh*) CFG_FAULT=fault-openbsd-sh.h ;;
sparc*) CFG_FAULT=fault-openbsd-sparc.h ;;
vax*) CFG_FAULT=fault-openbsd-vax.h ;;
*) CFG_FAULT=fault-openbsd.h ;;
esac
FAULT_CONTEXT='struct sigcontext'
;;
mirbsd*)
case "$host_cpu" in
i?86 | x86_64)
CFG_FAULT=fault-openbsd-i386.h
FAULT_CONTEXT='struct sigcontext'
;;
esac
;;
linux*)
case "$host_cpu" in
ia64)
CFG_FAULT=fault-linux-ia64-old.h
FAULT_CONTEXT='struct sigcontext'
;;
esac
;;
darwin*)
case "$host_cpu" in
aarch64*) CFG_FAULT=fault-macos-arm64.h ;;
i?86 | x86_64) CFG_FAULT=fault-macos-i386.h ;;
powerpc* | rs6000) CFG_FAULT=fault-macos-powerpc.h ;;
*) CFG_FAULT=fault-macos.h ;;
esac
FAULT_CONTEXT='ucontext_t'
FAULT_CONTEXT_INCLUDE='#include <sys/ucontext.h>'
;;
haiku*)
case "$host_cpu" in
i?86 | x86_64) CFG_FAULT=fault-haiku-i386.h ;;
*) CFG_FAULT=fault-haiku.h ;;
esac
FAULT_CONTEXT='ucontext_t'
FAULT_CONTEXT_INCLUDE='#include <signal.h>'
;;
esac
if test -z "$CFG_FAULT"; then
dnl <ucontext.h> was required by POSIX:2001, and many systems have it. But
dnl POSIX:2008 does not require it any more, and MirBSD does not have it.
AC_CHECK_HEADERS([ucontext.h])
if test $ac_cv_header_ucontext_h = yes; then
case "$host_os" in
solaris*)
case "$host_cpu" in
i?86 | x86_64) CFG_FAULT=fault-solaris-i386.h ;;
sparc*)
case "$host_os" in
solaris2.11)
CFG_FAULT=fault-solaris11-sparc.h
;;
*)
CFG_FAULT=fault-solaris-sparc.h
;;
esac
;;
*) CFG_FAULT=fault-solaris.h ;;
esac
;;
aix*)
case "$host_cpu" in
powerpc* | rs6000) CFG_FAULT=fault-aix5-powerpc.h ;;
*) CFG_FAULT=fault-aix5.h ;;
esac
;;
freebsd* | dragonfly* | kfreebsd*)
case "$host_cpu" in
arm* | strongarm* | xscale* | aarch64*)
CFG_FAULT=fault-freebsd-arm.h
;;
*)
CFG_FAULT=fault-posix-ucontext.h
;;
esac
;;
netbsd*)
CFG_FAULT=fault-netbsd.h
;;
linux*)
case "$host_cpu" in
alpha*)
CFG_FAULT=fault-linux-alpha.h
;;
arm* | strongarm* | xscale* | aarch64*)
CFG_FAULT=fault-linux-arm.h
;;
cris)
CFG_FAULT=fault-linux-cris.h
;;
hppa* | parisc*)
CFG_FAULT=fault-linux-hppa.h
;;
i?86 | x86_64)
CFG_FAULT=fault-linux-i386.h
;;
ia64)
CFG_FAULT=fault-linux-ia64.h
;;
loongarch64)
CFG_FAULT=fault-linux-loongarch.h
;;
m68*)
CFG_FAULT=fault-linux-m68k.h
;;
mips*)
CFG_FAULT=fault-linux-mips.h
;;
nds32*)
CFG_FAULT=fault-linux-nds32.h
;;
powerpc* | rs6000)
CFG_FAULT=fault-linux-powerpc.h
;;
riscv64)
CFG_FAULT=fault-linux-riscv64.h
;;
s390*)
CFG_FAULT=fault-linux-s390.h
;;
sh*)
CFG_FAULT=fault-linux-sh.h
;;
sparc*)
CFG_FAULT=fault-linux-sparc.h
;;
*)
CFG_FAULT=fault-posix-ucontext.h
;;
esac
;;
cygwin*)
case "$host_cpu" in
i?86* | x86_64*)
CFG_FAULT=fault-cygwin-i386.h
;;
*)
CFG_FAULT=fault-cygwin.h
;;
esac
;;
gnu*)
case "$host_cpu" in
i?86 | x86_64)
CFG_FAULT=fault-hurd-i386.h
;;
*)
CFG_FAULT=fault-posix-ucontext.h
;;
esac
;;
*)
CFG_FAULT=fault-posix-ucontext.h
;;
esac
FAULT_CONTEXT='ucontext_t'
FAULT_CONTEXT_INCLUDE='#include <ucontext.h>'
else
CFG_FAULT=fault-posix.h
FAULT_CONTEXT='void'
fi
fi
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_linux_i386" = yes; then
case "$host_cpu" in
i?86 | x86_64) CFG_FAULT=fault-linux-i386-old.h ;;
esac
FAULT_CONTEXT='struct sigcontext'
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_linux_i386_old" = yes; then
case "$host_cpu" in
i?86 | x86_64) CFG_FAULT=fault-linux-i386-oldold.h ;;
esac
FAULT_CONTEXT='struct sigcontext'
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_linux_powerpc" = yes; then
case "$host_cpu" in
powerpc* | rs6000) CFG_FAULT=fault-linux-powerpc-old.h ;;
esac
FAULT_CONTEXT='struct sigcontext'
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_linux_hppa" = yes; then
case "$host_cpu" in
hppa* | parisc*) CFG_FAULT=fault-linux-hppa-old.h ;;
esac
fi
if test -z "$CFG_FAULT"; then
case "$host_os" in
macos* | darwin[[6-9]]* | darwin[[1-9]][[0-9]]*)
case "$host_cpu" in
powerpc* | rs6000 | i?86 | x86_64 | aarch64)
CFG_MACHFAULT=machfault-macos.h
FAULT_CONTEXT_INCLUDE='#include <signal.h>
#include <mach/thread_status.h>
#if defined __aarch64__
#define sigsegv_thread_state_t arm_thread_state64_t
#endif
#if defined __ppc64__
#define sigsegv_thread_state_t ppc_thread_state64_t
#elif defined __ppc__
#define sigsegv_thread_state_t ppc_thread_state_t
#endif
#if defined __x86_64__
#define sigsegv_thread_state_t x86_thread_state64_t
#elif defined __i386__
#if defined x86_THREAD_STATE32
#define sigsegv_thread_state_t x86_thread_state32_t
#else
#define sigsegv_thread_state_t i386_thread_state_t
#endif
#endif'
FAULT_CONTEXT='sigsegv_thread_state_t'
;;
esac
if test -n "$CFG_MACHFAULT"; then
CFG_HANDLER=handler-macos.c
CFG_FAULT=fault-macos.h # nonexistent, just a dummy
fi
;;
esac
fi
dnl
dnl Next, the cases where there is a hairy CPU dependent way to get the
dnl fault address.
dnl
if test -z "$CFG_FAULT" && test "$sv_cv_fault_linux_m68k" = yes; then
case "$host_cpu" in
m68*)
CFG_FAULT=fault-linux-m68k-old.h
FAULT_CONTEXT='struct sigcontext'
;;
esac
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_macosdarwin7_ppc" = yes; then
case "$host_cpu" in
powerpc* | rs6000)
CFG_FAULT=fault-macosdarwin7-powerpc.h
FAULT_CONTEXT='ucontext_t'
FAULT_CONTEXT_INCLUDE='#include <signal.h>
#include <ucontext.h>'
;;
esac
fi
if test -z "$CFG_FAULT" && test "$sv_cv_fault_macosdarwin5_ppc" = yes; then
case "$host_cpu" in
powerpc* | rs6000)
CFG_FAULT=fault-macosdarwin5-powerpc.h
FAULT_CONTEXT='struct sigcontext'
;;
esac
fi
case "$host_os" in
mingw* | windows*)
FAULT_CONTEXT='CONTEXT'
FAULT_CONTEXT_INCLUDE='#include <windows.h>'
CFG_FAULT=fault-win32.h # nonexistent, just a dummy
;;
cygwin*)
if test "$enable_support_old_cygwin" = yes; then
FAULT_CONTEXT='struct _CONTEXT'
# CONTEXT is defined in <windows.h>, but cygwin programs should not
# normally inspect the contents of CONTEXT, and the outright inclusion
# of <windows.h> pollutes the namespace.
FAULT_CONTEXT_INCLUDE='struct _CONTEXT;'
# Cygwin 1.7 uses fault-posix.h. Cygwin 1.5.x needs a hacky workaround.
if test -z "$CFG_FAULT"; then
CFG_FAULT=fault-cygwin-old.h
AC_DEFINE([OLD_CYGWIN_WORKAROUND], [1],
[Define to 1 on Cygwin versions older than 1.7.])
fi
fi
;;
esac
if test -n "$CFG_FAULT"; then
sv_cv_have_sigsegv_recovery=yes
else
sv_cv_have_sigsegv_recovery=no
dnl
dnl No way to get the fault address. But other information is available.
dnl
case "$host_os" in
linux*)
case "$host_cpu" in
alpha*)
CFG_FAULT=fault-linux-alpha-old.h
FAULT_CONTEXT='struct sigcontext'
;;
arm* | strongarm* | xscale*)
CFG_FAULT=fault-linux-arm-old.h
FAULT_CONTEXT='struct sigcontext'
;;
cris)
CFG_FAULT=fault-linux-cris-old.h
FAULT_CONTEXT='struct sigcontext'
;;
mips*)
CFG_FAULT=fault-linux-mips-old.h
FAULT_CONTEXT='struct sigcontext'
;;
s390*)
CFG_FAULT=fault-linux-s390-old.h
FAULT_CONTEXT='struct sigcontext'
;;
sh*)
CFG_FAULT=fault-linux-sh-old.h
FAULT_CONTEXT='struct sigcontext'
;;
sparc*)
CFG_FAULT=fault-linux-sparc-old.h
FAULT_CONTEXT='struct sigcontext'
;;
x86_64)
CFG_FAULT=fault-linux-x86_64-old.h
FAULT_CONTEXT='struct sigcontext'
;;
esac
;;
beos*)
case "$host_cpu" in
i?86 | x86_64) CFG_FAULT=fault-beos-i386.h ;;
*) CFG_FAULT=fault-beos.h ;;
esac
FAULT_CONTEXT='struct vregs'
;;
macos* | darwin*)
case "$host_cpu" in
i?86 | x86_64) CFG_FAULT=fault-macos-i386-old.h ;;
esac
FAULT_CONTEXT='struct sigcontext'
;;
esac
fi
AC_MSG_CHECKING([for the fault handler specifics])
if test -n "$CFG_FAULT"; then
sv_cv_fault_include=$CFG_FAULT
else
if test -n "$CFG_MACHFAULT"; then
sv_cv_fault_include=$CFG_MACHFAULT
else
sv_cv_fault_include=none
fi
fi
AC_MSG_RESULT([$sv_cv_fault_include])
if test -z "$CFG_FAULT"; then
CFG_FAULT=fault-none.h
fi
AC_DEFINE_UNQUOTED([CFG_FAULT], ["$CFG_FAULT"],
[The name of the include file describing the fault handler.])
if test -z "$CFG_MACHFAULT"; then
CFG_MACHFAULT=fault-none.h
fi
AC_DEFINE_UNQUOTED([CFG_MACHFAULT], ["$CFG_MACHFAULT"],
[The name of the include file describing the Mach fault handler.])
AC_SUBST([FAULT_CONTEXT])
AC_SUBST([FAULT_CONTEXT_INCLUDE])
dnl AM_SUBST_NOTMAKE, because FAULT_CONTEXT_INCLUDE may have a multiline value.
AM_SUBST_NOTMAKE([FAULT_CONTEXT_INCLUDE])
dnl ================== Done with CFG_HANDLER partially, ==================
dnl ================== CFG_FAULT, CFG_MACHFAULT, ==================
dnl ================== FAULT_CONTEXT, FAULT_CONTEXT_INCLUDE ==================
dnl ===================== Determine HAVE_SIGSEGV_RECOVERY =====================
dnl Requires CFG_HANDLER / CFG_FAULT / etc.
AC_MSG_CHECKING([if the system supports catching SIGSEGV])
AC_MSG_RESULT([$sv_cv_have_sigsegv_recovery])
if test $sv_cv_have_sigsegv_recovery != no; then
HAVE_SIGSEGV_RECOVERY=1
else
HAVE_SIGSEGV_RECOVERY=0
fi
AC_SUBST([HAVE_SIGSEGV_RECOVERY])
dnl ===================== Done with HAVE_SIGSEGV_RECOVERY =====================
dnl The stackoverflow_context_t type depends on the CFG_FAULT include file.
dnl Stack direction.
SV_STACK_DIRECTION
dnl ========================= Determine CFG_STACKVMA =========================
dnl Requires AC_CANONICAL_HOST.
AC_ARG_ENABLE([stackvma],
AS_HELP_STRING([--disable-stackvma],
[detect stack overflow without stack VMA heuristic]),
[use_stackvma=$enableval], [use_stackvma=yes])
if test "$use_stackvma" != no; then
dnl Determination of the stack's virtual memory area.
AC_CACHE_CHECK([for prmap_t in sys/procfs.h], [sv_cv_procfsvma], [
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[
/* Persuade Solaris OpenIndiana <signal.h> to declare 'struct sigaltstack'. */
#define __EXTENSIONS__ 1
#include <sys/procfs.h>
]], [[prmap_t x;]])],
[sv_cv_procfsvma=yes], [sv_cv_procfsvma=no])
])
AC_CHECK_FUNCS([mquery mincore])
CFG_STACKVMA=
if test $sv_cv_procfsvma = yes; then
case "$host_os" in
aix*) CFG_STACKVMA=stackvma-aix.c ;;
*) CFG_STACKVMA=stackvma-procfs.c ;;
esac
fi
if test -z "$CFG_STACKVMA"; then
case "$host_os" in
linux*) CFG_STACKVMA=stackvma-linux.c ;;
freebsd* | kfreebsd*-gnu* | dragonfly*)
CFG_STACKVMA=stackvma-freebsd.c ;;
netbsd*) CFG_STACKVMA=stackvma-netbsd.c ;;
cygwin*) if test "$enable_support_old_cygwin" != yes; then
CFG_STACKVMA=stackvma-cygwin.c
fi
;;
beos* | haiku*) CFG_STACKVMA=stackvma-beos.c ;;
macos* | darwin*) CFG_STACKVMA=stackvma-mach.c ;;
dnl About gnu*): GNU/Hurd provides a /proc/self/maps file that is similar
dnl to one on Linux, and the vma_iterate (from gnulib) that reads this file
dnl works fine on GNU/Hurd under normal conditions. But in the context of
dnl libsigsegv, that is, during a SIGSEGV handler, it just hangs.
esac
fi
dnl We prefer the mquery based approach over the mincore based approach,
dnl because stackvma-mincore.c:is_unmapped() has a bad worst-case runtime.
if test -z "$CFG_STACKVMA" && test $ac_cv_func_mquery = yes; then
CFG_STACKVMA=stackvma-mquery.c
fi
if test -z "$CFG_STACKVMA" && test $ac_cv_func_mincore = yes; then
CFG_STACKVMA=stackvma-aix.c
fi
if test -n "$CFG_STACKVMA"; then
AC_DEFINE([HAVE_STACKVMA], [1],
[Define if CFG_STACKVMA is set to a nontrivial source file.])
else
CFG_STACKVMA=stackvma-none.c
fi
else
CFG_STACKVMA=stackvma-none.c
fi
AC_DEFINE_UNQUOTED([CFG_STACKVMA], ["$CFG_STACKVMA"],
[The name of the file determining the stack virtual memory area.])
AC_SUBST([CFG_STACKVMA])
dnl ========================= Done with CFG_STACKVMA =========================
AC_CHECK_FUNCS([getrlimit setrlimit])
dnl Catching stack overflow requires an alternate signal stack.
dnl The old "install a guard page" trick would be unreliable, because
dnl we don't know where exactly to place the guard page.
SV_SIGALTSTACK
dnl =========================== Determine CFG_LEAVE ===========================
dnl Requires AC_CANONICAL_HOST.
# How to longjmp out of a signal handler, in such a way that the
# alternate signal stack remains functional.
# On MacOS X 10.2 or newer, we don't need these tests, because we'll end up
# using handler-macos.c anyway. If we were to perform the tests, 2 Crash Report
# dialog windows would pop up.
case "$host_os" in
macos* | darwin[[6-9]]* | darwin[[1-9]][[0-9]]*) ;;
*)
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_LEAVE_HANDLER_LONGJMP([], sv_cv_leave_handler_longjmp,
[*-*-kfreebsd* | *-*-osf[4-9]* | *-*-hpux11* | *-*-linux2.[2-9]*],
[], [])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_LEAVE_HANDLER_LONGJMP([ and sigaltstack],
sv_cv_leave_handler_longjmp_sigaltstack,
[*-*-freebsd* | *-*-kfreebsd*],
[
#ifndef SS_ONSTACK
#define SS_ONSTACK SA_ONSTACK
#endif
],
[stack_t ss;
if (sigaltstack (NULL, &ss) >= 0)
{
ss.ss_flags &= ~SS_ONSTACK;
sigaltstack (&ss, NULL);
}
])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_LEAVE_HANDLER_LONGJMP([ and setcontext],
sv_cv_leave_handler_longjmp_setcontext,
[*-*-kfreebsd* | *-*-irix* | *-*-solaris*],
[#include <ucontext.h>
#ifndef SS_ONSTACK
#define SS_ONSTACK SA_ONSTACK
#endif
],
[static int fl;
static ucontext_t uc;
fl = 0;
if (getcontext (&uc) >= 0)
if (fl == 0)
if (uc.uc_stack.ss_flags & SS_ONSTACK)
{
uc.uc_stack.ss_flags &= ~SS_ONSTACK;
fl = 1;
setcontext (&uc);
}
])
# End of MacOS X special casing.
;;
esac
# How to siglongjmp out of a signal handler, in such a way that the
# alternate signal stack remains functional.
# On MacOS X 10.2 or newer, we don't need these tests, because we'll end up
# using handler-macos.c anyway. If we were to perform the tests, 2 Crash Report
# dialog windows would pop up.
case "$host_os" in
macos* | darwin[[6-9]]* | darwin[[1-9]][[0-9]]*) ;;
*)
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_LEAVE_HANDLER_SIGLONGJMP([], sv_cv_leave_handler_siglongjmp,
[*-*-kfreebsd* | *-*-osf[4-9]* | *-*-hpux11* | *-*-linux2.[2-9]* | *-*-irix* | *-*-solaris*],
[], [])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_LEAVE_HANDLER_SIGLONGJMP([ and sigaltstack],
sv_cv_leave_handler_siglongjmp_sigaltstack,
[*-*-freebsd* | *-*-kfreebsd*],
[
#ifndef SS_ONSTACK
#define SS_ONSTACK SA_ONSTACK
#endif
],
[stack_t ss;
if (sigaltstack (NULL, &ss) >= 0)
{
ss.ss_flags &= ~SS_ONSTACK;
sigaltstack (&ss, NULL);
}
])
dnl FIXME: Put in some more known values into the third argument.
SV_TRY_LEAVE_HANDLER_SIGLONGJMP([ and setcontext],
sv_cv_leave_handler_siglongjmp_setcontext,
[*-*-kfreebsd*],
[#include <ucontext.h>
#ifndef SS_ONSTACK
#define SS_ONSTACK SA_ONSTACK
#endif
],
[static int fl;
static ucontext_t uc;
fl = 0;
if (getcontext(&uc) >= 0)
if (fl == 0)
if (uc.uc_stack.ss_flags & SS_ONSTACK)
{
uc.uc_stack.ss_flags &= ~SS_ONSTACK;
fl = 1;
setcontext(&uc);
}
])
# End of MacOS X special casing.
;;
esac
CFG_LEAVE=
if test "$sv_cv_leave_handler_longjmp" != no; then
CFG_LEAVE=leave-nop.c
else
if test "$sv_cv_leave_handler_longjmp_sigaltstack" != no; then
CFG_LEAVE=leave-sigaltstack.c
else
if test "$sv_cv_leave_handler_longjmp_setcontext" != no; then
CFG_LEAVE=leave-setcontext.c
fi
fi
fi
case "$host_os" in
# On BeOS, the 6 tests fail because sigaltstack() doesn't exist.
# If one uses set_signal_stack() instead of sigaltstack(), the first
# test actually works. i.e. sv_cv_leave_handler_longjmp would be 'yes'.
beos*) CFG_LEAVE=leave-nop.c ;;
esac
if test -z "$CFG_LEAVE"; then
CFG_LEAVE=leave-none.c
fi
AC_DEFINE_UNQUOTED([CFG_LEAVE], ["$CFG_LEAVE"],
[The name of the file implementing sigsegv_reset_onstack_flag.])
AC_SUBST([CFG_LEAVE])
dnl =========================== Done with CFG_LEAVE ===========================
dnl ================= Determine HAVE_STACK_OVERFLOW_RECOVERY =================
dnl Requires AC_CANONICAL_HOST, CFG_HANDLER / CFG_FAULT / etc., CFG_STACKVMA,
dnl CFG_LEAVE.
AC_CACHE_CHECK([if the system supports catching stack overflow],
[sv_cv_have_stack_overflow_recovery],
[
dnl On Mach, it requires a machfault-*.h (see src/handler-macos.c).
dnl On Unix, it requires either sigaltstack() or the BeOS set_signal_stack()
dnl function, and the ability to longjmp out of the signal handler, and on
dnl Unix it also requires a fault-*.h or a stackvma-*.c with certain
dnl properties (see src/handler-unix.c).
if test "$CFG_MACHFAULT" != fault-none.h; then
sv_cv_have_stack_overflow_recovery=yes
else
case "$host_os" in
mingw* | windows* | cygwin*) sv_cv_have_stack_overflow_recovery=yes ;;
*)
if test "$CFG_LEAVE" != 'leave-none.c'; then
if test "$sv_cv_sigaltstack" != no; then
sv_cv_have_stack_overflow_recovery=maybe
else
case "$host_os" in
beos*) sv_cv_have_stack_overflow_recovery=maybe ;;
*) sv_cv_have_stack_overflow_recovery=no ;;
esac
fi
else
sv_cv_have_stack_overflow_recovery=no
fi