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authorDenys Vlasenko <vda.linux@googlemail.com>2016-04-21 16:26:30 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2016-04-21 17:39:11 +0200
commite6a2f4cc5a47d3022bdf5ca2cacbaa5a8c5baf7a (patch)
tree0962142ac9830312cd3df52994db41e8ac47c73c /scripts
parent5598bdf0d3d46a865a4d23785e2d09e6db9be420 (diff)
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libbb: make bb_common_bufsiz1 1 kbyte, add capability to use bss tail for it
The config item is FEATURE_USE_BSS_TAIL. When it is off (default): function old new delta read_config 210 228 +18 doCommands 2279 2294 +15 ipneigh_list_or_flush 763 772 +9 ipaddr_list_or_flush 1256 1261 +5 display_process_list 1301 1306 +5 conspy_main 1378 1383 +5 do_lzo_compress 352 355 +3 do_lzo_decompress 565 567 +2 push 46 44 -2 inetd_main 2136 2134 -2 uevent_main 421 418 -3 addLines 97 92 -5 bb_common_bufsiz1 8193 1024 -7169 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 8/5 up/down: 62/-7181) Total: -7119 bytes text data bss dec hex filename 829850 4086 9080 843016 cdd08 busybox_old 829901 4086 1904 835891 cc133 busybox_unstripped FEATURE_USE_BSS_TAIL=y: read_config 210 228 +18 doCommands 2279 2294 +15 ipneigh_list_or_flush 763 772 +9 ipaddr_list_or_flush 1256 1261 +5 display_process_list 1301 1306 +5 conspy_main 1378 1383 +5 do_lzo_compress 352 355 +3 do_lzo_decompress 565 567 +2 inetd_main 2136 2134 -2 bb_common_bufsiz1 8193 - -8193 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 8/1 up/down: 62/-8195) Total: -8133 bytes text data bss dec hex filename 829850 4086 9080 843016 cdd08 busybox_old 829911 4086 880 834877 cbd3d busybox_unstripped FIXME: setup_common_bufsiz() calls are missing. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/generate_BUFSIZ.sh114
1 files changed, 114 insertions, 0 deletions
diff --git a/scripts/generate_BUFSIZ.sh b/scripts/generate_BUFSIZ.sh
new file mode 100755
index 000000000..afe9eee1e
--- /dev/null
+++ b/scripts/generate_BUFSIZ.sh
@@ -0,0 +1,114 @@
1#!/bin/sh
2# Called from top-level directory a-la
3#
4# scripts/generate_BUFSIZ.sh include/common_bufsiz.h
5
6. ./.config || exit 1
7
8debug=false
9
10common_bufsiz_h=$1
11
12test x"$NM" = x"" && NM="${CONFIG_CROSS_COMPILER_PREFIX}nm"
13test x"$CC" = x"" && CC="${CONFIG_CROSS_COMPILER_PREFIX}gcc"
14
15regenerate() {
16 cat >"$1.$$"
17 test -f "$1" && diff "$1.$$" "$1" >/dev/null && rm "$1.$$" && return
18 mv "$1.$$" "$1"
19}
20
21generate_std_and_exit() {
22 $debug && echo "Default: bb_common_bufsiz1[] in bss"
23 {
24 echo "enum { COMMON_BUFSIZE = 1024 };"
25 echo "extern char bb_common_bufsiz1[];"
26 echo "#define setup_common_bufsiz() ((void)0)"
27 } | regenerate "$common_bufsiz_h"
28 exit 0
29}
30
31# User does not want any funky stuff?
32test x"$CONFIG_FEATURE_USE_BSS_TAIL" = x"y" || generate_std_and_exit
33
34test -f busybox_unstripped || {
35 # We did not try anything yet
36 $debug && echo "Will try to fit bb_common_bufsiz1[] into _end[]"
37 {
38 echo "enum { COMMON_BUFSIZE = 1024 };"
39 echo "extern char _end[]; /* linker-provided label */"
40 echo "#define bb_common_bufsiz1 _end"
41 echo "#define setup_common_bufsiz() ((void)0)"
42 } | regenerate "$common_bufsiz_h"
43 echo 1024 >"$common_bufsiz_h.BUFSIZE"
44 exit 0
45}
46
47# Get _end address
48END=`$NM busybox_unstripped | grep ' . _end$'| cut -d' ' -f1`
49test x"$END" = x"" && generate_std_and_exit
50$debug && echo "END:0x$END $((0x$END))"
51END=$((0x$END))
52
53# Get PAGE_SIZE
54echo "\
55#include <sys/user.h>
56#if defined(PAGE_SIZE) && PAGE_SIZE > 0
57char page_size[PAGE_SIZE];
58#else
59char page_size[1];
60#endif
61" >page_size_$$.c
62$CC -c "page_size_$$.c" || generate_std_and_exit
63PAGE_SIZE=`$NM --size-sort "page_size_$$.o" | cut -d' ' -f1`
64rm "page_size_$$.c" "page_size_$$.o"
65test x"$PAGE_SIZE" = x"" && generate_std_and_exit
66$debug && echo "PAGE_SIZE:0x$PAGE_SIZE $((0x$PAGE_SIZE))"
67PAGE_SIZE=$((0x$PAGE_SIZE))
68test $PAGE_SIZE -lt 1024 && generate_std_and_exit
69
70# How much space between _end[] and next page?
71PAGE_MASK=$((PAGE_SIZE-1))
72REM=$(( (-END) & PAGE_MASK ))
73$debug && echo "REM:$REM"
74
75if test $REM -lt 1024; then
76 # _end[] has no enough space for bb_common_bufsiz1[],
77 # users will need to malloc it.
78 {
79 echo "enum { COMMON_BUFSIZE = 1024 };"
80 echo "extern char *bb_common_bufsiz1;"
81 echo "void setup_common_bufsiz(void);"
82 } | regenerate "$common_bufsiz_h"
83 # Check that we aren't left with a buggy binary:
84 if test -f "$common_bufsiz_h.BUFSIZE"; then
85 rm "$common_bufsiz_h.BUFSIZE"
86 echo "Warning! Space in _end[] is too small ($REM bytes)!"
87 echo "Rerun make to build a binary which doesn't use it!"
88 exit 1
89 fi
90 exit 0
91fi
92
93# _end[] has REM bytes for bb_common_bufsiz1[]
94OLD=1024
95test -f "$common_bufsiz_h.BUFSIZE" && OLD=`cat "$common_bufsiz_h.BUFSIZE"`
96$debug && echo "OLD:$OLD"
97{
98echo "enum { COMMON_BUFSIZE = $REM };"
99echo "extern char _end[]; /* linker-provided label */"
100echo "#define bb_common_bufsiz1 _end"
101echo "#define setup_common_bufsiz() ((void)0)"
102} | regenerate "$common_bufsiz_h"
103echo $REM >"$common_bufsiz_h.BUFSIZE"
104
105# Check that code did not grow too much and thus _end[] did not shink:
106if test $OLD -gt $REM; then
107 echo "Warning! Space in _end[] has decreased from $OLD to $REM bytes!"
108 echo "Rerun make!"
109 exit 1
110fi
111
112if test $OLD != $REM; then
113 echo "Space in _end[] is $REM bytes. Rerun make to use larger COMMON_BUFSIZE."
114fi