| 1 | # stack-direction.m4 serial 7
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| 2 | dnl Copyright (C) 2002-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software, distributed under the terms of the GNU
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| 4 | dnl General Public License. As a special exception to the GNU General
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| 5 | dnl Public License, this file may be distributed as part of a program
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| 6 | dnl that contains a configuration script generated by Autoconf, under
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| 7 | dnl the same distribution terms as the rest of that program.
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| 8 |
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| 9 | dnl Written by Bruno Haible.
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| 10 |
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| 11 | # Determine the stack direction. Define the C macro STACK_DIRECTION.
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| 12 | AC_DEFUN([SV_STACK_DIRECTION],
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| 13 | [
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| 14 | AC_REQUIRE([AC_CANONICAL_HOST])
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| 15 | AC_CACHE_CHECK([for stack direction], [sv_cv_stack_direction_msg], [
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| 16 | case "$host_cpu" in
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| 17 | dnl See the #define STACK_GROWS_DOWNWARD in gcc-3.1/gcc/config/*/*.h.
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| 18 | a29k | \
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| 19 | aarch64* | \
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| 20 | alpha* | \
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| 21 | arc | \
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| 22 | arm* | strongarm* | xscale* | \
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| 23 | avr | avr32 | \
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| 24 | bfin | \
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| 25 | c1 | c2 | c32 | c34 | c38 | \
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| 26 | clipper | \
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| 27 | cris | \
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| 28 | d30v | \
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| 29 | elxsi | \
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| 30 | fr30 | \
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| 31 | h8300 | \
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| 32 | i?86 | x86_64 | \
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| 33 | i860 | \
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| 34 | ia64 | \
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| 35 | m32r | \
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| 36 | m68* | \
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| 37 | m88k | \
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| 38 | mcore | \
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| 39 | microblaze | \
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| 40 | mips* | \
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| 41 | mmix | \
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| 42 | mn10200 | \
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| 43 | mn10300 | \
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| 44 | nios2 | \
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| 45 | nds32* | \
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| 46 | ns32k | \
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| 47 | pdp11 | \
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| 48 | pj* | \
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| 49 | powerpc* | rs6000 | \
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| 50 | riscv* | \
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| 51 | romp | \
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| 52 | s390* | \
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| 53 | sh* | \
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| 54 | sparc* | \
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| 55 | v850 | \
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| 56 | vax | \
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| 57 | xtensa)
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| 58 | sv_cv_stack_direction=-1 ;;
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| 59 | c4x | \
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| 60 | dsp16xx | \
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| 61 | i960 | \
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| 62 | hppa* | parisc* | \
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| 63 | stormy16 | \
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| 64 | we32k)
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| 65 | sv_cv_stack_direction=1 ;;
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| 66 | *)
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| 67 | if test $cross_compiling = no; then
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| 68 | cat > conftest.c <<EOF
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| 69 | #include <stdio.h>
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| 70 | int
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| 71 | find_stack_direction (int *addr, int depth)
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| 72 | {
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| 73 | int dir, dummy = 0;
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| 74 | if (! addr)
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| 75 | addr = &dummy;
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| 76 | *addr = addr < &dummy ? 1 : addr == &dummy ? 0 : -1;
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| 77 | dir = depth ? find_stack_direction (addr, depth - 1) : 0;
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| 78 | return dir + dummy;
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| 79 | }
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| 80 | int
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| 81 | main (int argc, char *argv[])
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| 82 | {
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| 83 | printf ("%d\n", find_stack_direction (NULL, argc + 20));
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| 84 | return 0;
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| 85 | }
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| 86 | EOF
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| 87 | AC_TRY_EVAL([ac_link])
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| 88 | sv_cv_stack_direction=`./conftest`
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| 89 | else
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| 90 | sv_cv_stack_direction=0
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| 91 | fi
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| 92 | ;;
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| 93 | esac
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| 94 | case $sv_cv_stack_direction in
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| 95 | 1) sv_cv_stack_direction_msg="grows up";;
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| 96 | -1) sv_cv_stack_direction_msg="grows down";;
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| 97 | *) sv_cv_stack_direction_msg="unknown";;
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| 98 | esac
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| 99 | ])
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| 100 | AC_DEFINE_UNQUOTED([STACK_DIRECTION], [$sv_cv_stack_direction],
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| 101 | [Define as the direction of stack growth for your system.
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| 102 | STACK_DIRECTION > 0 => grows toward higher addresses
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| 103 | STACK_DIRECTION < 0 => grows toward lower addresses
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| 104 | STACK_DIRECTION = 0 => spaghetti stack.])
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| 105 | ])
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