emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

*: add optimization barrier to all "G trick" locations

Browse Source
This commit is contained in:
Denis Vlasenko
2008-02-27 18:41:59 +00:00
parent fe66a0eca1
commit 574f2f4394
32 changed files with 97 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
include/libbb.h
View File

@ -1208,10 +1208,14 @@ extern char bb_common_bufsiz1[COMMON_BUFSIZE];
struct globals;
/* '*const' ptr makes gcc optimize code much better.
* Magic prevents ptr_to_globals from going into rodata.
* If you want to assign a value, use PTR_TO_GLOBALS = xxx */
* If you want to assign a value, use SET_PTR_TO_GLOBALS(x) */
extern struct globals *const ptr_to_globals;
#define PTR_TO_GLOBALS (*(struct globals**)&ptr_to_globals)
/* At least gcc 3.4.6 on mipsel system needs optimization barrier */
#define barrier() asm volatile("":::"memory")
#define SET_PTR_TO_GLOBALS(x) do { \
(*(struct globals**)&ptr_to_globals) = (x); \
barrier(); \
} while (0)
/* You can change LIBBB_DEFAULT_LOGIN_SHELL, but don't use it,
* use bb_default_login_shell and following defines.