build system: fix generate_BUFSIZ.sh to not alternate 1k and malloc builds
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
93e1aaa1c7
commit
d7b502c059
2
Makefile
2
Makefile
@ -611,7 +611,7 @@ quiet_cmd_busybox__ ?= LINK $@
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"$(core-y)" \
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"$(libs-y)" \
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"$(LDLIBS)" \
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&& $(srctree)/scripts/generate_BUFSIZ.sh include/common_bufsiz.h
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&& $(srctree)/scripts/generate_BUFSIZ.sh --post include/common_bufsiz.h
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# Generate System.map
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quiet_cmd_sysmap = SYSMAP
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@ -7,11 +7,16 @@
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debug=false
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postcompile=false
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test x"$1" = x"--post" && { postcompile=true; shift; }
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common_bufsiz_h=$1
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test x"$NM" = x"" && NM="${CONFIG_CROSS_COMPILER_PREFIX}nm"
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test x"$CC" = x"" && CC="${CONFIG_CROSS_COMPILER_PREFIX}gcc"
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exitcmd="exit 0"
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regenerate() {
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cat >"$1.$$"
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test -f "$1" && diff "$1.$$" "$1" >/dev/null && rm "$1.$$" && return
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@ -19,99 +24,130 @@ regenerate() {
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}
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generate_std_and_exit() {
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$debug && echo "Default: bb_common_bufsiz1[] in bss"
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$debug && echo "Configuring: bb_common_bufsiz1[] in bss"
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{
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echo "enum { COMMON_BUFSIZE = 1024 };"
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echo "extern char bb_common_bufsiz1[];"
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echo "#define setup_common_bufsiz() ((void)0)"
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} | regenerate "$common_bufsiz_h"
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exit 0
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echo "std" >"$common_bufsiz_h.method"
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$exitcmd
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}
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# User does not want any funky stuff?
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test x"$CONFIG_FEATURE_USE_BSS_TAIL" = x"y" || generate_std_and_exit
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test -f busybox_unstripped || {
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# We did not try anything yet
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$debug && echo "Will try to fit bb_common_bufsiz1[] into _end[]"
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generate_big_and_exit() {
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$debug && echo "Configuring: bb_common_bufsiz1[] in _end[], COMMON_BUFSIZE = $1"
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{
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echo "enum { COMMON_BUFSIZE = 1024 };"
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echo "enum { COMMON_BUFSIZE = $1 };"
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echo "extern char _end[]; /* linker-provided label */"
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echo "#define bb_common_bufsiz1 _end"
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echo "#define setup_common_bufsiz() ((void)0)"
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} | regenerate "$common_bufsiz_h"
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echo 1024 >"$common_bufsiz_h.BUFSIZE"
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exit 0
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echo "$2" >"$common_bufsiz_h.method"
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$exitcmd
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}
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# Get _end address
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END=`$NM busybox_unstripped | grep ' . _end$'| cut -d' ' -f1`
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test x"$END" = x"" && generate_std_and_exit
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$debug && echo "END:0x$END $((0x$END))"
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END=$((0x$END))
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generate_1k_and_exit() {
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generate_big_and_exit 1024 "1k"
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}
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# Get PAGE_SIZE
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echo "\
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#include <sys/user.h>
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#if defined(PAGE_SIZE) && PAGE_SIZE > 0
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char page_size[PAGE_SIZE];
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#else
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char page_size[1];
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#endif
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" >page_size_$$.c
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$CC -c "page_size_$$.c" || generate_std_and_exit
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PAGE_SIZE=`$NM --size-sort "page_size_$$.o" | cut -d' ' -f1`
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rm "page_size_$$.c" "page_size_$$.o"
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test x"$PAGE_SIZE" = x"" && generate_std_and_exit
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$debug && echo "PAGE_SIZE:0x$PAGE_SIZE $((0x$PAGE_SIZE))"
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PAGE_SIZE=$((0x$PAGE_SIZE))
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test $PAGE_SIZE -lt 1024 && generate_std_and_exit
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# How much space between _end[] and next page?
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PAGE_MASK=$((PAGE_SIZE-1))
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REM=$(( (-END) & PAGE_MASK ))
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$debug && echo "REM:$REM"
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if test $REM -lt 1024; then
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# _end[] has no enough space for bb_common_bufsiz1[],
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# users will need to malloc it.
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generate_malloc_and_exit() {
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$debug && echo "Configuring: bb_common_bufsiz1[] is malloced"
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{
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echo "enum { COMMON_BUFSIZE = 1024 };"
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echo "extern char *const bb_common_bufsiz1;"
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echo "void setup_common_bufsiz(void);"
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} | regenerate "$common_bufsiz_h"
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# Check that we aren't left with a buggy binary:
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if test -f "$common_bufsiz_h.BUFSIZE"; then
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rm "$common_bufsiz_h.BUFSIZE"
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echo "Warning! Space in _end[] is too small ($REM bytes)!"
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echo "malloc" >"$common_bufsiz_h.method"
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$exitcmd
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}
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# User does not want any funky stuff?
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test x"$CONFIG_FEATURE_USE_BSS_TAIL" = x"y" || generate_std_and_exit
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# The script is run two times: before compilation, when it needs to
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# (re)generate $common_bufsiz_h, and directly after successful build,
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# when it needs to assess whether the build is ok to use at all (not buggy),
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# and (re)generate $common_bufsiz_h for a future build.
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if $postcompile; then
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# Postcompile needs to create/delete OK/FAIL files
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test -f busybox_unstripped || exit 1
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test -f "$common_bufsiz_h.method" || exit 1
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# How the build was done?
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method=`cat -- "$common_bufsiz_h.method"`
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# Get _end address
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END=`$NM busybox_unstripped | grep ' . _end$'| cut -d' ' -f1`
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test x"$END" = x"" && generate_std_and_exit
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$debug && echo "END:0x$END $((0x$END))"
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END=$((0x$END))
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# Get PAGE_SIZE
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{
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echo "#include <sys/user.h>"
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echo "#if defined(PAGE_SIZE) && PAGE_SIZE > 0"
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echo "char page_size[PAGE_SIZE];"
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echo "#endif"
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} >page_size_$$.c
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$CC -c "page_size_$$.c" || exit 1
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PAGE_SIZE=`$NM --size-sort "page_size_$$.o" | cut -d' ' -f1`
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rm "page_size_$$.c" "page_size_$$.o"
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test x"$PAGE_SIZE" = x"" && exit 1
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$debug && echo "PAGE_SIZE:0x$PAGE_SIZE $((0x$PAGE_SIZE))"
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PAGE_SIZE=$((0x$PAGE_SIZE))
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test $PAGE_SIZE -lt 512 && exit 1
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# How much space between _end[] and next page?
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PAGE_MASK=$((PAGE_SIZE-1))
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COMMON_BUFSIZE=$(( (-END) & PAGE_MASK ))
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echo "COMMON_BUFSIZE = $COMMON_BUFSIZE bytes"
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if test x"$method" = x"1k"; then
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if test $COMMON_BUFSIZE -lt 1024; then
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# _end[] has no enough space for bb_common_bufsiz1[]
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rm -- "$common_bufsiz_h.1k.OK" 2>/dev/null
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{ md5sum <.config | cut -d' ' -f1; stat -c "%Y" .config; } >"$common_bufsiz_h.1k.FAIL"
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echo "Warning! Space in _end[] is too small ($COMMON_BUFSIZE bytes)!"
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echo "Rerun make to build a binary which doesn't use it!"
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exit 1
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rm busybox_unstripped
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exitcmd="exit 1"
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else
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rm -- "$common_bufsiz_h.1k.FAIL" 2>/dev/null
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echo $COMMON_BUFSIZE >"$common_bufsiz_h.1k.OK"
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test $COMMON_BUFSIZE -gt $((1024+32)) && echo "Rerun make to use larger COMMON_BUFSIZE"
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fi
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fi
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echo "COMMON_BUFSIZE = 1024 bytes, the buffer will be malloced"
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exit 0
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fi
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# _end[] has REM bytes for bb_common_bufsiz1[]
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OLD=1024
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test -f "$common_bufsiz_h.BUFSIZE" && OLD=`cat "$common_bufsiz_h.BUFSIZE"`
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$debug && echo "OLD:$OLD"
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{
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echo "enum { COMMON_BUFSIZE = $REM };"
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echo "extern char _end[]; /* linker-provided label */"
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echo "#define bb_common_bufsiz1 _end"
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echo "#define setup_common_bufsiz() ((void)0)"
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} | regenerate "$common_bufsiz_h"
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echo $REM >"$common_bufsiz_h.BUFSIZE"
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# Based on past success/fail of 1k build, decide next build type
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# Check that code did not grow too much and thus _end[] did not shrink:
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if test $OLD -gt $REM; then
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echo "Warning! Space in _end[] has decreased from $OLD to $REM bytes!"
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echo "Rerun make!"
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exit 1
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if test -f "$common_bufsiz_h.1k.OK"; then
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# Previous build succeeded fitting 1k into _end[].
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# Try bigger COMMON_BUFSIZE if possible.
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COMMON_BUFSIZE=`cat -- "$common_bufsiz_h.1k.OK"`
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# Round down a bit
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COMMON_BUFSIZE=$(( (COMMON_BUFSIZE-32) & 0xfffffe0 ))
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COMMON_BUFSIZE=$(( COMMON_BUFSIZE < 1024 ? 1024 : COMMON_BUFSIZE ))
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test $COMMON_BUFSIZE = 1024 && generate_1k_and_exit
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generate_big_and_exit $COMMON_BUFSIZE "big"
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fi
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if test $OLD != $REM; then
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echo "Space in _end[] is $REM bytes. Rerun make to use larger COMMON_BUFSIZE."
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else
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echo "COMMON_BUFSIZE = $REM bytes"
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if test -f "$common_bufsiz_h.1k.FAIL"; then
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# Previous build FAILED to fit 1k into _end[].
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# Was it with same .config?
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oldcfg=`cat -- "$common_bufsiz_h.1k.FAIL"`
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curcfg=`md5sum <.config | cut -d' ' -f1; stat -c "%Y" .config`
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# If yes, then build a "malloced" version
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if test x"$oldcfg" = x"$curcfg"; then
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echo "Will not try 1k build, it failed before. Touch .config to override"
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generate_malloc_and_exit
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fi
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# else: try 1k version
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echo "New .config, will try 1k build"
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rm -- "$common_bufsiz_h.1k.FAIL"
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generate_1k_and_exit
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fi
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# There was no 1k build yet. Try it.
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generate_1k_and_exit
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