diff options
Diffstat (limited to 'scripts')
| -rwxr-xr-x | scripts/generate_BUFSIZ.sh | 54 |
1 files changed, 41 insertions, 13 deletions
diff --git a/scripts/generate_BUFSIZ.sh b/scripts/generate_BUFSIZ.sh index 750fedb..8442619 100755 --- a/scripts/generate_BUFSIZ.sh +++ b/scripts/generate_BUFSIZ.sh @@ -6,6 +6,7 @@ . ./.config || exit 1 debug=false +#debug=true postcompile=false test x"$1" = x"--post" && { postcompile=true; shift; } @@ -62,6 +63,11 @@ generate_malloc_and_exit() { $exitcmd } +round_down_COMMON_BUFSIZE() { + COMMON_BUFSIZE=$(( ($1-32) & 0xfffffe0 )) + COMMON_BUFSIZE=$(( 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 @@ -102,22 +108,43 @@ if $postcompile; then # How much space between _end[] and next page? PAGE_MASK=$((PAGE_SIZE-1)) - COMMON_BUFSIZE=$(( (-END) & PAGE_MASK )) - echo "COMMON_BUFSIZE = $COMMON_BUFSIZE bytes" + TAIL_SIZE=$(( (-END) & PAGE_MASK )) + $debug && echo "TAIL_SIZE:$TAIL_SIZE bytes" - if test x"$method" != x"malloc"; then - if test $COMMON_BUFSIZE -lt 1024; then + if test x"$method" = x"1k" || test x"$method" = x"big"; then + if test $TAIL_SIZE -lt 1024; then # _end[] has no enough space for bb_common_bufsiz1[] + echo "Warning! Space in _end[] is too small ($TAIL_SIZE bytes)!" + echo "Rerun make to build a binary which doesn't use it!" rm -- "$common_bufsiz_h.1k.OK" 2>/dev/null { md5sum <.config | cut -d' ' -f1; stat -c "%Y" .config; } >"$common_bufsiz_h.1k.FAIL" - echo "Warning! Space in _end[] is too small ($COMMON_BUFSIZE bytes)!" - echo "Rerun make to build a binary which doesn't use it!" - rm busybox_unstripped busybox + rm busybox_unstripped busybox 2>/dev/null +# Note: here we can do either a "malloc" or "std" build. +# "malloc" gives a bit bigger code: +# text bss filename +# 804355 5385 busybox.std +# 804618 4361 busybox.malloc +# but may have a smaller .bss (not guaranteed!). Use "pmap -x" to verify. exitcmd="exit 1" + generate_malloc_and_exit else + PREV_SIZE=1024 + test x"$method" = x"big" && PREV_SIZE=`cat -- "$common_bufsiz_h.1k.OK"` + round_down_COMMON_BUFSIZE $PREV_SIZE + PREV_BUFSIZE=$COMMON_BUFSIZE + rm -- "$common_bufsiz_h.1k.FAIL" 2>/dev/null - echo $COMMON_BUFSIZE >"$common_bufsiz_h.1k.OK" - test $COMMON_BUFSIZE -gt $((1024+32)) && echo "Rerun make to use larger COMMON_BUFSIZE" + echo $TAIL_SIZE >"$common_bufsiz_h.1k.OK" + round_down_COMMON_BUFSIZE $TAIL_SIZE + # emit message only if COMMON_BUFSIZE is indeed larger + test $COMMON_BUFSIZE -gt $PREV_BUFSIZE \ + && echo "Rerun make to use larger COMMON_BUFSIZE ($COMMON_BUFSIZE)" +#TODO: test $PREV_BUFSIZE -lt $TAIL_SIZE && PANIC!!! +#Code size with COMMON_BUFSIZE > 1024 may be bigger than code with COMMON_BUFSIZE = 1024! +#(currently we just hope "-32 and round down to 32" saves us) + + test $COMMON_BUFSIZE = 1024 && generate_1k_and_exit + generate_big_and_exit $COMMON_BUFSIZE "big" fi fi fi @@ -127,13 +154,12 @@ fi if test -f "$common_bufsiz_h.1k.OK"; then # Previous build succeeded fitting 1k into _end[]. # Try bigger COMMON_BUFSIZE if possible. - COMMON_BUFSIZE=`cat -- "$common_bufsiz_h.1k.OK"` - # Round down a bit - COMMON_BUFSIZE=$(( (COMMON_BUFSIZE-32) & 0xfffffe0 )) - COMMON_BUFSIZE=$(( COMMON_BUFSIZE < 1024 ? 1024 : COMMON_BUFSIZE )) + TAIL_SIZE=`cat -- "$common_bufsiz_h.1k.OK"` + round_down_COMMON_BUFSIZE $TAIL_SIZE test $COMMON_BUFSIZE = 1024 && generate_1k_and_exit generate_big_and_exit $COMMON_BUFSIZE "big" fi + if test -f "$common_bufsiz_h.1k.FAIL"; then # Previous build FAILED to fit 1k into _end[]. # Was it with same .config? @@ -142,6 +168,7 @@ if test -f "$common_bufsiz_h.1k.FAIL"; then # If yes, then build a "malloced" version if test x"$oldcfg" = x"$curcfg"; then echo "Will not try 1k build, it failed before. Touch .config to override" +# Note: here we can do either a "malloc" or "std" build. generate_malloc_and_exit fi # else: try 1k version @@ -149,5 +176,6 @@ if test -f "$common_bufsiz_h.1k.FAIL"; then rm -- "$common_bufsiz_h.1k.FAIL" generate_1k_and_exit fi + # There was no 1k build yet. Try it. generate_1k_and_exit |