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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | #!/bin/sh
# Called from top-level directory a-la
#
# scripts/generate_BUFSIZ.sh include/common_bufsiz.h
. ./.config || exit 1
debug=false
#debug=true
postcompile=false
test x"$1" = x"--post" && { postcompile=true; shift; }
common_bufsiz_h=$1
test x"$NM" = x"" && NM="${CONFIG_CROSS_COMPILER_PREFIX}nm"
test x"$CC" = x"" && CC="${CONFIG_CROSS_COMPILER_PREFIX}gcc"
exitcmd="exit 0"
regenerate() {
cat >"$1.$$"
test -f "$1" && diff "$1.$$" "$1" >/dev/null && rm "$1.$$" && return
mv "$1.$$" "$1"
}
generate_std_and_exit() {
$debug && echo "Configuring: bb_common_bufsiz1[] in bss"
{
echo "enum { COMMON_BUFSIZE = 1024 };"
echo "extern char bb_common_bufsiz1[];"
echo "#define setup_common_bufsiz() ((void)0)"
} | regenerate "$common_bufsiz_h"
echo "std" >"$common_bufsiz_h.method"
$exitcmd
}
generate_big_and_exit() {
$debug && echo "Configuring: bb_common_bufsiz1[] in bss, COMMON_BUFSIZE = $1"
{
echo "enum { COMMON_BUFSIZE = $1 };"
echo "extern char bb_common_bufsiz1[];"
echo "#define setup_common_bufsiz() ((void)0)"
} | regenerate "$common_bufsiz_h"
echo "$2" >"$common_bufsiz_h.method"
$exitcmd
}
generate_1k_and_exit() {
generate_big_and_exit 1024 "1k"
}
round_down_COMMON_BUFSIZE() {
COMMON_BUFSIZE=1024
test "$1" -le 32 && return
COMMON_BUFSIZE=$(( ($1-32) & 0x0ffffff0 ))
COMMON_BUFSIZE=$(( COMMON_BUFSIZE < 1024 ? 1024 : COMMON_BUFSIZE ))
}
# User does not want any funky stuff?
test x"$CONFIG_FEATURE_USE_BSS_TAIL" = x"y" || generate_std_and_exit
# The script is run two times: before compilation, when it needs to
# (re)generate $common_bufsiz_h, and directly after successful build,
# when it needs to assess whether the build is ok to use at all (not buggy),
# and (re)generate $common_bufsiz_h for a future build.
if $postcompile; then
# Postcompile needs to create/delete OK/FAIL files
test -f busybox_unstripped || exit 1
test -f "$common_bufsiz_h.method" || exit 1
# How the build was done?
method=`cat -- "$common_bufsiz_h.method"`
# Get _end address
END=`$NM busybox_unstripped | grep ' . _end$'| cut -d' ' -f1`
test x"$END" = x"" && generate_std_and_exit
$debug && echo "END:0x$END $((0x$END))"
END=$((0x$END))
# Get PAGE_SIZE
{
echo "#include <sys/user.h>"
echo "#if defined(PAGE_SIZE) && PAGE_SIZE > 0"
echo "char page_size[PAGE_SIZE];"
echo "#endif"
} >page_size_$$.c
$CC -c "page_size_$$.c" || exit 1
PAGE_SIZE=`$NM --size-sort "page_size_$$.o" | cut -d' ' -f1`
rm "page_size_$$.c" "page_size_$$.o"
test x"$PAGE_SIZE" = x"" && exit 1
$debug && echo "PAGE_SIZE:0x$PAGE_SIZE $((0x$PAGE_SIZE))"
PAGE_SIZE=$((0x$PAGE_SIZE))
test $PAGE_SIZE -lt 1024 && exit 1
# How much space between _end[] and next page?
PAGE_MASK=$((PAGE_SIZE-1))
TAIL_SIZE=$(( (-END) & PAGE_MASK ))
$debug && echo "TAIL_SIZE:$TAIL_SIZE bytes"
if test x"$method" = x"1k"; then
{
echo $TAIL_SIZE
md5sum <.config | cut -d' ' -f1
stat -c "%Y" .config
} >"$common_bufsiz_h.1k.OK"
round_down_COMMON_BUFSIZE $((1024 + TAIL_SIZE))
# emit message only if COMMON_BUFSIZE is indeed larger
test $COMMON_BUFSIZE -gt 1024 \
&& echo "Rerun make to use larger COMMON_BUFSIZE ($COMMON_BUFSIZE)"
test $COMMON_BUFSIZE = 1024 && generate_1k_and_exit
generate_big_and_exit $COMMON_BUFSIZE "big"
fi
fi
# Based on past success/fail of 1k build, decide next build type
if test -f "$common_bufsiz_h.1k.OK"; then
# previous 1k build succeeded
oldcfg=`tail -n2 -- "$common_bufsiz_h.1k.OK"`
curcfg=`md5sum <.config | cut -d' ' -f1; stat -c "%Y" .config`
# config did not change
if test x"$oldcfg" = x"$curcfg"; then
# Try bigger COMMON_BUFSIZE if possible
TAIL_SIZE=`head -n1 -- "$common_bufsiz_h.1k.OK"`
round_down_COMMON_BUFSIZE $((1024 + TAIL_SIZE))
test $COMMON_BUFSIZE = 1024 && generate_1k_and_exit
generate_big_and_exit $COMMON_BUFSIZE "big"
fi
# config did change
rm -rf -- "$common_bufsiz_h.1k.OK"
fi
# There was no 1k build yet. Try it.
generate_1k_and_exit
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