138 lines
3.9 KiB
Bash
Executable File
138 lines
3.9 KiB
Bash
Executable File
#!/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
|