Optimize __memset_chk, __memcpy_chk. DO NOT MERGE.
This change creates assembler versions of __memcpy_chk/__memset_chk
that is implemented in the memcpy/memset assembler code. This change
avoids an extra call to memcpy/memset, instead allowing a simple fall
through to occur from the chk code into the body of the real
implementation.
Testing:
- Ran the libc_test on __memcpy_chk/__memset_chk on all nexus devices.
- Wrote a small test executable that has three calls to __memcpy_chk and
three calls to __memset_chk. First call dest_len is length + 1. Second
call dest_len is length. Third call dest_len is length - 1.
Verified that the first two calls pass, and the third fails. Examined
the logcat output on all nexus devices to verify that the fortify
error message was sent properly.
- I benchmarked the new __memcpy_chk and __memset_chk on all systems. For
__memcpy_chk and large copies, the savings is relatively small (about 1%).
For small copies, the savings is large on cortex-a15/krait devices
(between 5% to 30%).
For cortex-a9 and small copies, the speed up is present, but relatively
small (about 3% to 5%).
For __memset_chk and large copies, the savings is also small (about 1%).
However, all processors show larger speed-ups on small copies (about 30% to
100%).
Bug: 9293744
Merge from internal master.
(cherry-picked from 7c860db0747f6276a6e43984d43f8fa5181ea936)
Change-Id: I916ad305e4001269460ca6ebd38aaa0be8ac7f52
diff --git a/libc/private/libc_logging.h b/libc/private/libc_logging.h
index f69e2ed..1cdcb6e 100644
--- a/libc/private/libc_logging.h
+++ b/libc/private/libc_logging.h
@@ -36,19 +36,7 @@
__BEGIN_DECLS
-enum {
- BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW = 80100,
- BIONIC_EVENT_STRCAT_BUFFER_OVERFLOW = 80105,
- BIONIC_EVENT_MEMMOVE_BUFFER_OVERFLOW = 80110,
- BIONIC_EVENT_STRNCAT_BUFFER_OVERFLOW = 80115,
- BIONIC_EVENT_STRNCPY_BUFFER_OVERFLOW = 80120,
- BIONIC_EVENT_MEMSET_BUFFER_OVERFLOW = 80125,
- BIONIC_EVENT_STRCPY_BUFFER_OVERFLOW = 80130,
-
- BIONIC_EVENT_RESOLVER_OLD_RESPONSE = 80300,
- BIONIC_EVENT_RESOLVER_WRONG_SERVER = 80305,
- BIONIC_EVENT_RESOLVER_WRONG_QUERY = 80310,
-};
+#include "libc_events.h"
enum {
ANDROID_LOG_UNKNOWN = 0,