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Further optimize applet tables; prettify build output

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text    data     bss     dec     hex filename
 775923     929    9100  785952   bfe20 busybox_old
 775565     929    9100  785594   bfcba busybox_unstripped
This commit is contained in:
Denis Vlasenko 2007-11-29 03:31:20 +00:00
parent c253778de9
commit 745cd17926
5 changed files with 74 additions and 50 deletions
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14
applets/Kbuild
View File

@ -14,20 +14,20 @@ always:= $(hostprogs-y)
# Generated files need additional love
quiet_cmd_gen_usage_compressed = GEN include/usage_compressed.h
cmd_gen_usage_compressed = $(srctree)/applets/usage_compressed include/usage_compressed.h applets
HOSTCFLAGS_usage.o = -I$(srctree)/include
applets/applets.o: include/usage_compressed.h include/applet_tables.h
applets/usage: .config $(srctree)/applets/usage_compressed
quiet_cmd_gen_usage_compressed = GEN include/usage_compressed.h
cmd_gen_usage_compressed = $(srctree)/applets/usage_compressed include/usage_compressed.h applets
include/usage_compressed.h: applets/usage $(srctree)/applets/usage_compressed
$(call cmd,gen_usage_compressed)
# Two-stage file creation, to avoid having target file still created
# in case applet_tables fails
quiet_cmd_gen_applet_tables = GEN include/applet_tables.h
cmd_gen_applet_tables = applets/applet_tables include/applet_tables.h
include/applet_tables.h: applets/applet_tables
applets/applet_tables >include/applet_tables.h.tmp
mv include/applet_tables.h.tmp include/applet_tables.h
$(call cmd,gen_applet_tables)

55
applets/applet_tables.c
View File

@ -50,45 +50,66 @@ int main(int argc, char **argv)
qsort(applets, NUM_APPLETS, sizeof(applets[0]), cmp_name);
/* Keep in sync with include/busybox.h! */
puts("const char applet_names[] ALIGN1 =");
ofs = 0;
i = 0;
for (i = 0; i < NUM_APPLETS; i++) {
offset[i] = ofs;
ofs += strlen(applets[i].name) + 1;
}
/* We reuse 4 high-order bits of offset array for other purposes,
* so if they are indeed needed, refuse to proceed */
if (ofs > 0xfff)
return 1;
if (!argv[1])
return 1;
i = open(argv[1], O_WRONLY | O_TRUNC | O_CREAT, 0666);
if (i < 0)
return 1;
dup2(i, 1);
/* Keep in sync with include/busybox.h! */
puts("/* This is a generated file, don't edit */");
puts("const char applet_names[] ALIGN1 =");
for (i = 0; i < NUM_APPLETS; i++) {
printf("\"%s\" \"\\0\"\n", applets[i].name);
}
puts(";");
puts("int (*const applet_mains[])(int argc, char **argv) = {");
puts("int (*const applet_main[])(int argc, char **argv) = {");
for (i = 0; i < NUM_APPLETS; i++) {
printf("%s_main,\n", applets[i].main);
}
puts("};");
#if ENABLE_FEATURE_INSTALLER || ENABLE_FEATURE_PREFER_APPLETS
puts("const uint32_t applet_nameofs[] = {");
#else
puts("const uint16_t applet_nameofs[] ALIGN2 = {");
#endif
for (i = 0; i < NUM_APPLETS; i++) {
printf("0x%08x,\n",
printf("0x%04x,\n",
offset[i]
#if ENABLE_FEATURE_PREFER_APPLETS
+ (applets[i].nofork << 12)
+ (applets[i].noexec << 13)
#endif
#if ENABLE_FEATURE_SUID
+ (applets[i].need_suid << 14) /* 2 bits */
#endif
#if ENABLE_FEATURE_INSTALLER
+ (applets[i].install_loc << 16) /* 3 bits */
#endif
#if ENABLE_FEATURE_PREFER_APPLETS
+ (applets[i].nofork << 19)
+ (applets[i].noexec << 20)
#endif
);
}
puts("};");
#if ENABLE_FEATURE_INSTALLER
puts("const uint8_t applet_install_loc[] ALIGN1 = {");
i = 0;
while (i < NUM_APPLETS) {
int v = applets[i].install_loc; /* 3 bits */
if (++i < NUM_APPLETS)
v |= applets[i].install_loc << 4; /* 3 bits */
printf("0x%02x,\n", v);
i++;
}
puts("};");
#endif
return 0;
}

35
include/busybox.h
View File

@ -28,28 +28,31 @@ typedef enum bb_suid_t {
/* Defined in appletlib.c (by including generated applet_tables.h) */
/* Keep in sync with applets/applet_tables.c! */
extern const char applet_names[];
extern int (*const applet_mains[])(int argc, char **argv);
#if ENABLE_FEATURE_INSTALLER || ENABLE_FEATURE_PREFER_APPLETS
extern const uint32_t applet_nameofs[];
#else
extern int (*const applet_main[])(int argc, char **argv);
extern const uint16_t applet_nameofs[];
#endif
extern const uint8_t applet_install_loc[];
#if ENABLE_FEATURE_SUID
#define APPLET_NAME(i) (applet_names + (applet_nameofs[i] & 0x3fff))
#define APPLET_SUID(i) ((applet_nameofs[i] >> 14) & 0x3)
#if ENABLE_FEATURE_SUID || ENABLE_FEATURE_PREFER_APPLETS
#define APPLET_NAME(i) (applet_names + (applet_nameofs[i] & 0x0fff))
#else
#define APPLET_NAME(i) (applet_names + (applet_nameofs[i] & 0xffff))
#endif
#if ENABLE_FEATURE_INSTALLER
#define APPLET_INSTALL_LOC(i) ((applet_nameofs[i] >> 16) & 0x7)
#define APPLET_NAME(i) (applet_names + applet_nameofs[i])
#endif
#if ENABLE_FEATURE_PREFER_APPLETS
#define APPLET_IS_NOFORK(i) (applet_nameofs[i] & (1 << 19))
#define APPLET_IS_NOEXEC(i) (applet_nameofs[i] & (1 << 20))
#define APPLET_IS_NOFORK(i) (applet_nameofs[i] & (1 << 12))
#define APPLET_IS_NOEXEC(i) (applet_nameofs[i] & (1 << 13))
#endif
#if ENABLE_FEATURE_SUID
#define APPLET_SUID(i) ((applet_nameofs[i] >> 14) & 0x3)
#endif
#if ENABLE_FEATURE_INSTALLER
#define APPLET_INSTALL_LOC(i) ({ \
unsigned v = (i); \
if (v & 1) v = applet_install_loc[v/2] >> 4; \
else v = applet_install_loc[v/2] & 0xf; \
v; })
#endif

14
libbb/appletlib.c
View File

@ -101,19 +101,17 @@ void bb_show_usage(void)
}
/* NB: any char pointer will work as well, not necessarily applet_names */
static int applet_name_compare(const void *name, const void *v)
{
int i = (const char *)v - applet_names;
return strcmp(name, APPLET_NAME(i));
}
int find_applet_by_name(const char *name)
{
const char *p;
/* Do a binary search to find the applet entry given the name. */
/* NB: any char pointer will work as well, not necessarily applet_names */
p = bsearch(name, applet_names, ARRAY_SIZE(applet_mains), 1, applet_name_compare);
const char *p;
p = bsearch(name, applet_names, ARRAY_SIZE(applet_main), 1, applet_name_compare);
if (!p)
return -1;
return p - applet_names;
@ -543,10 +541,12 @@ static void install_links(const char *busybox, int use_symbolic_links)
if (use_symbolic_links)
lf = symlink;
for (i = 0; i < ARRAY_SIZE(applet_mains); i++) {
for (i = 0; i < ARRAY_SIZE(applet_main); i++) {
fpc = concat_path_file(
install_dir[APPLET_INSTALL_LOC(i)],
APPLET_NAME(i));
// debug: bb_error_msg("%slinking %s to busybox",
// use_symbolic_links ? "sym" : "", fpc);
rc = lf(busybox, fpc);
if (rc != 0 && errno != EEXIST) {
bb_simple_perror_msg(fpc);
@ -644,7 +644,7 @@ void run_applet_no_and_exit(int applet_no, char **argv)
bb_show_usage();
if (ENABLE_FEATURE_SUID)
check_suid(applet_no);
exit(applet_mains[applet_no](argc, argv));
exit(applet_main[applet_no](argc, argv));
}
void run_applet_and_exit(const char *name, char **argv)

2
libbb/vfork_daemon_rexec.c
View File

@ -143,7 +143,7 @@ int run_nofork_applet_prime(struct nofork_save_area *old, int applet_no, char **
char *tmp_argv[argc+1];
memcpy(tmp_argv, argv, (argc+1) * sizeof(tmp_argv[0]));
/* Finally we can call NOFORK applet's main() */
rc = applet_mains[applet_no](argc, tmp_argv);
rc = applet_main[applet_no](argc, tmp_argv);
} else { /* xfunc died in NOFORK applet */
/* in case they meant to return 0... */
if (rc == -2222)