mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 08:05:04 +07:00
86effd0dc6
This uses a new set of annoations viz. ENTRY_CFI/END_CFI to enabel cfi
ops generation.
Note that we didn't change the normal ENTRY/EXIT as we don't actually
want unwind info in the trap/exception/interrutp handlers which use
these, as unwinder then gets confused (it keeps recursing vs. stopping).
Semantically these are leaf routines and unwinding should stop when it
hits those routines.
Before
------
28.52% 1.19% 9929 hackbench libuClibc-1.0.17.so [.] __write_nocancel
|
---__write_nocancel
|--8.95%--EV_Trap
| --8.25%--sys_write
| |--3.93%--sock_write_iter
...
|--2.62%--memset <==== [LEAF entry as no unwind info]
^^^^^^
After
-----
29.46% 1.24% 13622 hackbench libuClibc-1.0.17.so [.] __write_nocancel
|
---__write_nocancel
|--9.31%--EV_Trap
| --8.62%--sys_write
| |--4.17%--sock_write_iter
...
|--6.19%--sys_write
| --6.19%--sock_write_iter
| unix_stream_sendmsg
| |--1.62%--sock_alloc_send_pskb
| |--0.89%--sock_def_readable
| |--0.88%--_raw_spin_unlock_irqrestore
| |--0.69%--memset
| | ^^^^^^ <==== [now in proper callframe]
| |
| --0.52%--skb_copy_datagram_from_iter
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
67 lines
1.2 KiB
ArmAsm
67 lines
1.2 KiB
ArmAsm
/*
|
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
ENTRY_CFI(memcpy)
|
|
or r3,r0,r1
|
|
asl_s r3,r3,30
|
|
mov_s r5,r0
|
|
brls.d r2,r3,.Lcopy_bytewise
|
|
sub.f r3,r2,1
|
|
ld_s r12,[r1,0]
|
|
asr.f lp_count,r3,3
|
|
bbit0.d r3,2,.Lnox4
|
|
bmsk_s r2,r2,1
|
|
st.ab r12,[r5,4]
|
|
ld.a r12,[r1,4]
|
|
.Lnox4:
|
|
lppnz .Lendloop
|
|
ld_s r3,[r1,4]
|
|
st.ab r12,[r5,4]
|
|
ld.a r12,[r1,8]
|
|
st.ab r3,[r5,4]
|
|
.Lendloop:
|
|
breq r2,0,.Last_store
|
|
ld r3,[r5,0]
|
|
#ifdef __LITTLE_ENDIAN__
|
|
add3 r2,-1,r2
|
|
; uses long immediate
|
|
xor_s r12,r12,r3
|
|
bmsk r12,r12,r2
|
|
xor_s r12,r12,r3
|
|
#else /* BIG ENDIAN */
|
|
sub3 r2,31,r2
|
|
; uses long immediate
|
|
xor_s r3,r3,r12
|
|
bmsk r3,r3,r2
|
|
xor_s r12,r12,r3
|
|
#endif /* ENDIAN */
|
|
.Last_store:
|
|
j_s.d [blink]
|
|
st r12,[r5,0]
|
|
|
|
.balign 4
|
|
.Lcopy_bytewise:
|
|
jcs [blink]
|
|
ldb_s r12,[r1,0]
|
|
lsr.f lp_count,r3
|
|
bhs_s .Lnox1
|
|
stb.ab r12,[r5,1]
|
|
ldb.a r12,[r1,1]
|
|
.Lnox1:
|
|
lppnz .Lendbloop
|
|
ldb_s r3,[r1,1]
|
|
stb.ab r12,[r5,1]
|
|
ldb.a r12,[r1,2]
|
|
stb.ab r3,[r5,1]
|
|
.Lendbloop:
|
|
j_s.d [blink]
|
|
stb r12,[r5,0]
|
|
END_CFI(memcpy)
|