1303 files changed, 32187 insertions, 57138 deletions
diff --git a/scripts/generate_BUFSIZ.sh b/scripts/generate_BUFSIZ.sh new file mode 100755 index 0000000..718788e --- a/dev/null +++ b/scripts/generate_BUFSIZ.sh @@ -0,0 +1,137 @@ +#!/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 |