ARC: dw2 unwind: enable cfi pseudo ops in string lib
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>
This commit is contained in:
Vineet Gupta
parent
5a205a32ff
commit
86effd0dc6
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@ -23,6 +23,7 @@
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.global __switch_to
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.type __switch_to, @function
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__switch_to:
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CFI_STARTPROC
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/* Save regs on kernel mode stack of task */
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st.a blink, [sp, -4]
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@ -59,4 +60,4 @@ __switch_to:
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ld.ab blink, [sp, 4]
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j [blink]
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END(__switch_to)
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END_CFI(__switch_to)
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@ -16,7 +16,7 @@
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#define SHIFT r2
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#endif
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ENTRY(memcmp)
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ENTRY_CFI(memcmp)
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or r12,r0,r1
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asl_s r12,r12,30
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sub r3,r2,1
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@ -149,4 +149,4 @@ ENTRY(memcmp)
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.Lnil:
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j_s.d [blink]
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mov r0,0
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END(memcmp)
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END_CFI(memcmp)
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@ -8,7 +8,7 @@
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#include <linux/linkage.h>
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ENTRY(memcpy)
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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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@ -63,4 +63,4 @@ ENTRY(memcpy)
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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(memcpy)
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END_CFI(memcpy)
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@ -40,7 +40,7 @@
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# define ZOLAND 0xF
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#endif
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ENTRY(memcpy)
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ENTRY_CFI(memcpy)
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prefetch [r1] ; Prefetch the read location
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prefetchw [r0] ; Prefetch the write location
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mov.f 0, r2
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@ -233,4 +233,4 @@ ENTRY(memcpy)
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.Lcopybytewise_3:
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j [blink]
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END(memcpy)
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END_CFI(memcpy)
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@ -10,7 +10,7 @@
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#undef PREALLOC_NOT_AVAIL
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ENTRY(memset)
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ENTRY_CFI(memset)
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prefetchw [r0] ; Prefetch the write location
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mov.f 0, r2
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;;; if size is zero
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@ -112,11 +112,11 @@ ENTRY(memset)
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j [blink]
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END(memset)
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END_CFI(memset)
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ENTRY(memzero)
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ENTRY_CFI(memzero)
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; adjust bzero args to memset args
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mov r2, r1
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b.d memset ;tail call so need to tinker with blink
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mov r1, 0
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END(memzero)
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END_CFI(memzero)
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@ -10,7 +10,7 @@
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#define SMALL 7 /* Must be at least 6 to deal with alignment/loop issues. */
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ENTRY(memset)
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ENTRY_CFI(memset)
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mov_s r4,r0
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or r12,r0,r2
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bmsk.f r12,r12,1
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@ -46,14 +46,14 @@ ENTRY(memset)
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stb.ab r1,[r4,1]
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.Ltiny_end:
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j_s [blink]
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END(memset)
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END_CFI(memset)
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; memzero: @r0 = mem, @r1 = size_t
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; memset: @r0 = mem, @r1 = char, @r2 = size_t
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ENTRY(memzero)
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ENTRY_CFI(memzero)
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; adjust bzero args to memset args
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mov r2, r1
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mov r1, 0
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b memset ;tail call so need to tinker with blink
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END(memzero)
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END_CFI(memzero)
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@ -13,7 +13,7 @@
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#include <linux/linkage.h>
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ENTRY(strchr)
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ENTRY_CFI(strchr)
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extb_s r1,r1
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asl r5,r1,8
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bmsk r2,r0,1
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@ -130,4 +130,4 @@ ENTRY(strchr)
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j_s.d [blink]
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mov.mi r0,0
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#endif /* ENDIAN */
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END(strchr)
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END_CFI(strchr)
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@ -8,7 +8,7 @@
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#include <linux/linkage.h>
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ENTRY(strcmp)
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ENTRY_CFI(strcmp)
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or r2, r0, r1
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bmsk_s r2, r2, 1
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brne r2, 0, @.Lcharloop
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@ -75,4 +75,4 @@ ENTRY(strcmp)
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.Lcmpend:
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j_s.d [blink]
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sub r0, r2, r3
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END(strcmp)
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END_CFI(strcmp)
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@ -15,7 +15,7 @@
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#include <linux/linkage.h>
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ENTRY(strcmp)
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ENTRY_CFI(strcmp)
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or r2,r0,r1
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bmsk_s r2,r2,1
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brne r2,0,.Lcharloop
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@ -93,4 +93,4 @@ ENTRY(strcmp)
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.Lcmpend:
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j_s.d [blink]
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sub r0,r2,r3
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END(strcmp)
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END_CFI(strcmp)
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@ -18,7 +18,7 @@
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#include <linux/linkage.h>
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ENTRY(strcpy)
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ENTRY_CFI(strcpy)
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or r2,r0,r1
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bmsk_s r2,r2,1
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brne.d r2,0,charloop
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@ -67,4 +67,4 @@ charloop:
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brne.d r3,0,charloop
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stb.ab r3,[r10,1]
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j [blink]
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END(strcpy)
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END_CFI(strcpy)
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@ -8,7 +8,7 @@
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#include <linux/linkage.h>
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ENTRY(strlen)
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ENTRY_CFI(strlen)
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or r3,r0,7
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ld r2,[r3,-7]
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ld.a r6,[r3,-3]
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@ -80,4 +80,4 @@ ENTRY(strlen)
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.Learly_end:
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b.d .Lend
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sub_s.ne r1,r1,r1
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END(strlen)
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END_CFI(strlen)
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