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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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ENTRY_CFI(memcpy)
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or r3,r0,r1
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asl_s r3,r3,30
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mov_s r5,r0
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brls.d r2,r3,.Lcopy_bytewise
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sub.f r3,r2,1
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ld_s r12,[r1,0]
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asr.f lp_count,r3,3
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bbit0.d r3,2,.Lnox4
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bmsk_s r2,r2,1
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st.ab r12,[r5,4]
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ld.a r12,[r1,4]
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.Lnox4:
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lppnz .Lendloop
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ld_s r3,[r1,4]
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st.ab r12,[r5,4]
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ld.a r12,[r1,8]
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st.ab r3,[r5,4]
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.Lendloop:
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breq r2,0,.Last_store
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ld r3,[r5,0]
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#ifdef __LITTLE_ENDIAN__
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add3 r2,-1,r2
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; uses long immediate
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xor_s r12,r12,r3
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bmsk r12,r12,r2
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xor_s r12,r12,r3
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#else /* BIG ENDIAN */
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sub3 r2,31,r2
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; uses long immediate
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xor_s r3,r3,r12
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bmsk r3,r3,r2
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xor_s r12,r12,r3
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#endif /* ENDIAN */
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.Last_store:
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j_s.d [blink]
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st r12,[r5,0]
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.balign 4
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.Lcopy_bytewise:
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jcs [blink]
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ldb_s r12,[r1,0]
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lsr.f lp_count,r3
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bhs_s .Lnox1
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stb.ab r12,[r5,1]
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ldb.a r12,[r1,1]
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.Lnox1:
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lppnz .Lendbloop
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ldb_s r3,[r1,1]
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stb.ab r12,[r5,1]
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ldb.a r12,[r1,2]
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stb.ab r3,[r5,1]
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.Lendbloop:
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j_s.d [blink]
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stb r12,[r5,0]
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END_CFI(memcpy)
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