* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
@ 2009-07-17 18:20 ` mjw at redhat dot com
2009-07-29 16:58 ` mhiramat at redhat dot com
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From: mjw at redhat dot com @ 2009-07-17 18:20 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mjw at redhat dot com 2009-07-17 18:20 -------
Bug #10318 comment #7 seems to contain another instance of this bug
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
2009-07-17 18:20 ` [Bug translator/10408] " mjw at redhat dot com
@ 2009-07-29 16:58 ` mhiramat at redhat dot com
2009-07-29 17:13 ` mjw at redhat dot com
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From: mhiramat at redhat dot com @ 2009-07-29 16:58 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mhiramat at redhat dot com 2009-07-29 16:58 -------
Verified on bear Fedora11:
kernel-PAE-2.6.29.6-213.fc11.i686
systemtap-0.9.8-1.fc11.i586
Here is the c code generated by stap -p3.
---
c->last_stmt = "identifier '$epfd' at
/usr/share/systemtap/tapset/syscalls.stp:657:37";
if (unlikely (c->nesting+2 >= MAXNESTING)) {
c->last_error = "MAXNESTING exceeded";
return;
} else {
c->nesting ++;
}
l->__retvalue = 0;
#define return goto out
{
{
{
intptr_t addr;
{ // DWARF expression: 0x71
{
intptr_t s0;
s0 = fetch_register (1) + 0L;
addr = s0;
}
}
{ int32_t value = deref (4, addr);THIS->__retvalue = value; }
---
fetch_register(1) is regs->cx. Should that be reg->sp(or fetch_register(4))?
BTW, this kernel is built with ftrace(mcount).
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
2009-07-17 18:20 ` [Bug translator/10408] " mjw at redhat dot com
2009-07-29 16:58 ` mhiramat at redhat dot com
@ 2009-07-29 17:13 ` mjw at redhat dot com
2009-07-29 19:59 ` mhiramat at redhat dot com
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From: mjw at redhat dot com @ 2009-07-29 17:13 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mjw at redhat dot com 2009-07-29 17:13 -------
It doesn't seem PAE, I see the same on 2.6.29.6-213.fc11.i586
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (2 preceding siblings ...)
2009-07-29 17:13 ` mjw at redhat dot com
@ 2009-07-29 19:59 ` mhiramat at redhat dot com
2009-07-29 19:59 ` mhiramat at redhat dot com
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From: mhiramat at redhat dot com @ 2009-07-29 19:59 UTC (permalink / raw)
To: systemtap
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |mhiramat at redhat dot com
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (3 preceding siblings ...)
2009-07-29 19:59 ` mhiramat at redhat dot com
@ 2009-07-29 19:59 ` mhiramat at redhat dot com
2009-07-31 15:24 ` mhiramat at redhat dot com
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From: mhiramat at redhat dot com @ 2009-07-29 19:59 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mhiramat at redhat dot com 2009-07-29 19:59 -------
Dwarfdump said:
---
<1><48125> DW_TAG_subprogram
DW_AT_external yes(1)
DW_AT_name sys_epoll_wait
DW_AT_decl_file 1 fs/eventpoll.c
DW_AT_decl_line 1249
DW_AT_prototyped yes(1)
DW_AT_type <172>
DW_AT_low_pc 0xc04cc908
DW_AT_high_pc 0xc04ccc8b
DW_AT_frame_base <loclist with 3 entries follows>
[ 0]<lowpc=0xc04cc908><highpc=0xc04cc909>DW_OP_breg4+4
[ 1]<lowpc=0xc04cc909><highpc=0xc04cc90b>DW_OP_breg4+8
[ 2]<lowpc=0xc04cc90b><highpc=0xc04ccc8b>DW_OP_breg5+8
DW_AT_sibling <49424>
<2><48155> DW_TAG_formal_parameter
DW_AT_name epfd
DW_AT_decl_file 1 fs/eventpoll.c
DW_AT_decl_line 1249
DW_AT_type <96>
DW_AT_location <loclist with 3 entries follows>
[ 0]<lowpc=0xc04cc908><highpc=0xc04cc93f>DW_OP_breg1+0
[ 1]<lowpc=0xc04cc93f><highpc=0xc04cc96c>DW_OP_reg0
[ 2]<lowpc=0xc04cc96c><highpc=0xc04ccc8b>DW_OP_breg1+0
---
And objdump said:
---
c04cc908 <sys_epoll_wait>:
c04cc908: 55 push %ebp
c04cc909: 89 e5 mov %esp,%ebp
c04cc90b: 57 push %edi
c04cc90c: 56 push %esi
c04cc90d: 53 push %ebx
c04cc90e: 51 push %ecx
c04cc90f: 83 ec 60 sub $0x60,%esp
c04cc912: 8d 4d 08 lea 0x8(%ebp),%ecx <---here!
c04cc915: e8 4a d5 f3 ff call c0409e64 <mcount>
c04cc91a: 8b 51 04 mov 0x4(%ecx),%edx
c04cc91d: 8b 01 mov (%ecx),%eax
c04cc91f: 8b 79 0c mov 0xc(%ecx),%edi
c04cc922: 89 55 b0 mov %edx,-0x50(%ebp)
c04cc925: 8b 71 08 mov 0x8(%ecx),%esi
c04cc928: 89 f2 mov %esi,%edx
c04cc92a: 4a dec %edx
---
You can see that the top of stack address is assigned to ecx at c04cc912.
However, dwarf has no such information. It seems gcc's bug.(maybe, the
combination of -g and mcount will cause this bug)
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (4 preceding siblings ...)
2009-07-29 19:59 ` mhiramat at redhat dot com
@ 2009-07-31 15:24 ` mhiramat at redhat dot com
2009-07-31 16:38 ` mjw at redhat dot com
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From: mhiramat at redhat dot com @ 2009-07-31 15:24 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mhiramat at redhat dot com 2009-07-31 15:23 -------
Here is the result of stap ... -p2 (probe part)
---
# probes
kernel.function("sys_epoll_wait@fs/eventpoll.c:1249")? /* pc=_stext+0xca908 */
/* <- syscall.epoll_wait = kernel.function("compat_sys_epoll_wait")?,
kernel.function("SyS_epoll_wait")!, kernel.function("sys_epoll_wait")? <-
syscall.epoll_wait */
# locals
argstr:string
{
(argstr) = (sprintf("%d, %p, %d, %d", _dwarf_tvar_get_epfd_4(),
_dwarf_tvar_get_events_5(), _dwarf_tvar_get_maxevents_6(),
_dwarf_tvar_get_timeout_7()))
printf("%s\\n", argstr)
exit()
}
---
And /proc/kallsyms said;
c0402000 T _stext
So, actual probing address is 0xc04cc908 (sys_epoll_wait+0).
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (5 preceding siblings ...)
2009-07-31 15:24 ` mhiramat at redhat dot com
@ 2009-07-31 16:38 ` mjw at redhat dot com
2009-07-31 21:47 ` mhiramat at redhat dot com
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From: mjw at redhat dot com @ 2009-07-31 16:38 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mjw at redhat dot com 2009-07-31 16:38 -------
On my i386 machine the prologue tests also fail:
FAIL: prologues -P
FAIL: prologues no-P
This is most likely related since the probe is placed so early.
Do those tests also fail for you?
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (6 preceding siblings ...)
2009-07-31 16:38 ` mjw at redhat dot com
@ 2009-07-31 21:47 ` mhiramat at redhat dot com
2009-07-31 23:29 ` mhiramat at redhat dot com
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16 siblings, 0 replies; 18+ messages in thread
From: mhiramat at redhat dot com @ 2009-07-31 21:47 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mhiramat at redhat dot com 2009-07-31 21:47 -------
(In reply to comment #6)
> On my i386 machine the prologue tests also fail:
> FAIL: prologues -P
> FAIL: prologues no-P
>
> This is most likely related since the probe is placed so early.
> Do those tests also fail for you?
Yes, I got same results.
Running /usr/share/systemtap/testsuite/systemtap.base/prologues.exp ...
FAIL: prologues -P
FAIL: prologues no-P
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (7 preceding siblings ...)
2009-07-31 21:47 ` mhiramat at redhat dot com
@ 2009-07-31 23:29 ` mhiramat at redhat dot com
2009-08-07 21:31 ` mhiramat at redhat dot com
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16 siblings, 0 replies; 18+ messages in thread
From: mhiramat at redhat dot com @ 2009-07-31 23:29 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mhiramat at redhat dot com 2009-07-31 23:29 -------
Here are the results of dwarfdump and objdump with/without mcount(ftrace).
I'm compiling linux-2.6.31-rc4-tip by gcc-4.4.0-4.i586.
With ftrace (-pg)
------------
<1><44129> DW_TAG_subprogram
DW_AT_external yes(1)
DW_AT_name sys_epoll_wait
DW_AT_decl_file 1
/home/mhiramat/ksrc/linux-2.6-tip/fs/eventpoll.c
DW_AT_decl_line 1321
DW_AT_prototyped yes(1)
DW_AT_type <350>
DW_AT_low_pc 0xc10ce507
DW_AT_high_pc 0xc10ce6ef
DW_AT_frame_base <loclist with 3 entries follows>
[ 0]<lowpc=0xc10ce507><highpc=0xc10ce508>DW_OP_breg4+4
[ 1]<lowpc=0xc10ce508><highpc=0xc10ce50a>DW_OP_breg4+8
[ 2]<lowpc=0xc10ce50a><highpc=0xc10ce6ef>DW_OP_breg5+8
DW_AT_sibling <44909>
<2><44159> DW_TAG_formal_parameter
DW_AT_name epfd
DW_AT_decl_file 1
/home/mhiramat/ksrc/linux-2.6-tip/fs/eventpoll.c
DW_AT_decl_line 1321
DW_AT_type <60>
DW_AT_location <loclist with 3 entries follows>
[ 0]<lowpc=0xc10ce507><highpc=0xc10ce53e>DW_OP_breg1+0
[ 1]<lowpc=0xc10ce53e><highpc=0xc10ce568>DW_OP_reg0
[ 2]<lowpc=0xc10ce568><highpc=0xc10ce6ef>DW_OP_breg1+0
------------
c10ce507 <sys_epoll_wait>:
c10ce507: 55 push %ebp
c10ce508: 89 e5 mov %esp,%ebp
c10ce50a: 57 push %edi
c10ce50b: 56 push %esi
c10ce50c: 53 push %ebx
c10ce50d: 51 push %ecx
c10ce50e: 83 ec 34 sub $0x34,%esp
c10ce511: 8d 4d 08 lea 0x8(%ebp),%ecx <--!here!
c10ce514: e8 9f 50 f3 ff call c10035b8 <mcount>
c10ce519: bb ea ff ff ff mov $0xffffffea,%ebx
c10ce51e: 8b 51 04 mov 0x4(%ecx),%edx
c10ce521: 8b 01 mov (%ecx),%eax
c10ce523: 8b 71 0c mov 0xc(%ecx),%esi
c10ce526: 89 55 c0 mov %edx,-0x40(%ebp)
c10ce529: 8b 79 08 mov 0x8(%ecx),%edi
c10ce52c: 89 fa mov %edi,%edx
c10ce52e: 4a dec %edx
c10ce52f: 81 fa a9 aa aa 0a cmp $0xaaaaaa9,%edx
c10ce535: 89 7d c4 mov %edi,-0x3c(%ebp)
------------
Without ftrace (no -pg)
----------
<1><44101> DW_TAG_subprogram
DW_AT_external yes(1)
DW_AT_name sys_epoll_wait
DW_AT_decl_file 1
/home/mhiramat/ksrc/linux-2.6-tip/fs/eventpoll.c
DW_AT_decl_line 1321
DW_AT_prototyped yes(1)
DW_AT_type <350>
DW_AT_low_pc 0xc10b34cd
DW_AT_high_pc 0xc10b36b0
DW_AT_frame_base <loclist with 3 entries follows>
[ 0]<lowpc=0xc10b34cd><highpc=0xc10b34ce>DW_OP_breg4+4
[ 1]<lowpc=0xc10b34ce><highpc=0xc10b34d0>DW_OP_breg4+8
[ 2]<lowpc=0xc10b34d0><highpc=0xc10b36b0>DW_OP_breg5+8
DW_AT_sibling <44881>
<2><44131> DW_TAG_formal_parameter
DW_AT_name epfd
DW_AT_decl_file 1
/home/mhiramat/ksrc/linux-2.6-tip/fs/eventpoll.c
DW_AT_decl_line 1321
DW_AT_type <60>
DW_AT_location <loclist with 3 entries follows>
[ 0]<lowpc=0xc10b34cd><highpc=0xc10b34ff>DW_OP_breg1+0
[ 1]<lowpc=0xc10b34ff><highpc=0xc10b3529>DW_OP_reg0
[ 2]<lowpc=0xc10b3529><highpc=0xc10b36b0>DW_OP_breg1+0
----------
c10b34cd <sys_epoll_wait>:
c10b34cd: 55 push %ebp
c10b34ce: 89 e5 mov %esp,%ebp
c10b34d0: 57 push %edi
c10b34d1: 56 push %esi
c10b34d2: 53 push %ebx
c10b34d3: bb ea ff ff ff mov $0xffffffea,%ebx
c10b34d8: 51 push %ecx
c10b34d9: 8d 4d 08 lea 0x8(%ebp),%ecx <--!here!
c10b34dc: 83 ec 34 sub $0x34,%esp
c10b34df: 8b 51 04 mov 0x4(%ecx),%edx
c10b34e2: 8b 01 mov (%ecx),%eax
c10b34e4: 8b 71 0c mov 0xc(%ecx),%esi
c10b34e7: 89 55 c0 mov %edx,-0x40(%ebp)
c10b34ea: 8b 79 08 mov 0x8(%ecx),%edi
c10b34ed: 89 fa mov %edi,%edx
c10b34ef: 4a dec %edx
c10b34f0: 81 fa a9 aa aa 0a cmp $0xaaaaaa9,%edx
c10b34f6: 89 7d c4 mov %edi,-0x3c(%ebp)
----------
OK... Even without mcount, the dwarf information seems broken. You can see the
top of stack is assigned to DW_OP_breg1(=ecx) at c10b34d9. But there is no such
information (or did I miss it?).
What further information do we need?
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (8 preceding siblings ...)
2009-07-31 23:29 ` mhiramat at redhat dot com
@ 2009-08-07 21:31 ` mhiramat at redhat dot com
2009-08-20 15:34 ` mhiramat at redhat dot com
` (6 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: mhiramat at redhat dot com @ 2009-08-07 21:31 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mhiramat at redhat dot com 2009-08-07 21:31 -------
I've reported on rh bugzilla for fedora11 (because I could see this only on F11).
https://bugzilla.redhat.com/show_bug.cgi?id=516300
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (9 preceding siblings ...)
2009-08-07 21:31 ` mhiramat at redhat dot com
@ 2009-08-20 15:34 ` mhiramat at redhat dot com
2009-08-20 15:44 ` mhiramat at redhat dot com
` (5 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: mhiramat at redhat dot com @ 2009-08-20 15:34 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mhiramat at redhat dot com 2009-08-20 15:33 -------
(In reply to comment #9)
> I've reported on rh bugzilla for fedora11 (because I could see this only on F11).
> https://bugzilla.redhat.com/show_bug.cgi?id=516300
>
The bug seems fixed in gcc-4.4.1. However, I'm still not sure stap can decode
DW_OP_call_frame_cfa.
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (10 preceding siblings ...)
2009-08-20 15:34 ` mhiramat at redhat dot com
@ 2009-08-20 15:44 ` mhiramat at redhat dot com
2009-08-20 19:58 ` mhiramat at redhat dot com
` (4 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: mhiramat at redhat dot com @ 2009-08-20 15:44 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mhiramat at redhat dot com 2009-08-20 15:43 -------
Oops, stap can't decode dwarf generated by gcc-4.4.1...
$ stap --vp 02 -r 2.6.31-rc6-tip -e 'probe kernel.function("sys_epoll_wait")
{print($epfd)}'
WARNING: kernel release/architecture mismatch with host forces last-pass 4.
probe sys_epoll_wait@/home/mhiramat/ksrc/linux-2.6-tip/fs/eventpoll.c:1321
kernel reloc=.dynamic section=.text pc=0xc10b3d0d
semantic error: dwarf_getlocation_addr (form 0xa): invalid DWARF
Pass 2: analyzed script: 1 probe(s), 0 function(s), 0 embed(s), 0 global(s) in
490usr/60sys/557real ms.
Pass 2: analysis failed. Try again with another '--vp 01' option.
Running rm -rf /tmp/stapMvMIoA
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (11 preceding siblings ...)
2009-08-20 15:44 ` mhiramat at redhat dot com
@ 2009-08-20 19:58 ` mhiramat at redhat dot com
2009-08-20 20:00 ` mhiramat at redhat dot com
` (3 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: mhiramat at redhat dot com @ 2009-08-20 19:58 UTC (permalink / raw)
To: systemtap
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |roland at redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=10408
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (12 preceding siblings ...)
2009-08-20 19:58 ` mhiramat at redhat dot com
@ 2009-08-20 20:00 ` mhiramat at redhat dot com
2009-08-20 20:17 ` mjw at redhat dot com
` (2 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: mhiramat at redhat dot com @ 2009-08-20 20:00 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mhiramat at redhat dot com 2009-08-20 20:00 -------
roland, could you give us any suggestion about this change?
Will it be a gcc bug? or elfutils or systemtap needs to be improved?
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (13 preceding siblings ...)
2009-08-20 20:00 ` mhiramat at redhat dot com
@ 2009-08-20 20:17 ` mjw at redhat dot com
2009-08-20 21:09 ` mhiramat at redhat dot com
2009-08-27 14:23 ` mjw at redhat dot com
16 siblings, 0 replies; 18+ messages in thread
From: mjw at redhat dot com @ 2009-08-20 20:17 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mjw at redhat dot com 2009-08-20 20:17 -------
(In reply to comment #11)
> Oops, stap can't decode dwarf generated by gcc-4.4.1...
> [...]
> However, I'm still not sure stap can decode DW_OP_call_frame_cfa.
Yes it can since:
commit 00b01a991cc4300f18c747853e85841d187b1fa4
Author: Mark Wielaard <mjw@redhat.com>
Date: Wed Jul 15 12:04:57 2009 +0200
PR10388 Support DW_OP_call_frame_cfa.
Depends on elfutils 0.142 cfi support.
But you need to build systemtap against elfutils 0.142+
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (14 preceding siblings ...)
2009-08-20 20:17 ` mjw at redhat dot com
@ 2009-08-20 21:09 ` mhiramat at redhat dot com
2009-08-27 14:23 ` mjw at redhat dot com
16 siblings, 0 replies; 18+ messages in thread
From: mhiramat at redhat dot com @ 2009-08-20 21:09 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mhiramat at redhat dot com 2009-08-20 21:09 -------
Thanks, I've checked that stap works with elfutils-0.142.
$ stap --vp 02 -r 2.6.31-rc6-tip -e 'probe kernel.function("sys_epoll_wait")
{print($epfd)}' -p2
probe sys_epoll_wait@/home/mhiramat/ksrc/linux-2.6-tip/fs/eventpoll.c:1321
kernel reloc=.dynamic section=.text pc=0xc10b3d0d
# functions
_dwarf_tvar_get_epfd_0:long ()
%{{
{
intptr_t addr;
intptr_t frame_base;
{ // DWARF expression: 0x92(4,4)
{
intptr_t s0;
s0 = fetch_register (4) + 4L;
frame_base = s0;
}
}
{ // DWARF expression: 0x91
{
intptr_t s0;
s0 = frame_base + 0L;
addr = s0;
}
}
{ int32_t value = deref (4, addr);THIS->__retvalue = value; }
}
goto out;
if (0) goto deref_fault;
deref_fault:
goto out;
}
/* pure */%}
# probes
kernel.function("sys_epoll_wait@/home/mhiramat/ksrc/linux-2.6-tip/fs/eventpoll.c:1321")
/* pc=_stext+0xb2c25 */ /* <- kernel.function("sys_epoll_wait") */
print(_dwarf_tvar_get_epfd_0())
Pass 2: analyzed script: 1 probe(s), 1 function(s), 0 embed(s), 0 global(s) in
540usr/90sys/628real ms.
Running rm -rf /tmp/stapgtVMtt
However, we'll need to wait for new gcc.
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* [Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF
2009-07-17 9:18 [Bug translator/10408] New: IA-32 - stap unable to decode parameter location using DWARF ananth at in dot ibm dot com
` (15 preceding siblings ...)
2009-08-20 21:09 ` mhiramat at redhat dot com
@ 2009-08-27 14:23 ` mjw at redhat dot com
16 siblings, 0 replies; 18+ messages in thread
From: mjw at redhat dot com @ 2009-08-27 14:23 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mjw at redhat dot com 2009-08-27 14:22 -------
(In reply to comment #14)
> However, we'll need to wait for new gcc.
Which seems to have arrived, plus a recompiled kernel package using it.
At least on Fedora 11.
$ rpm -q gcc; uname -r; stap -V 2>&1 | head -1
gcc-4.4.1-2.fc11.i586
2.6.29.6-217.2.16.fc11.i586
SystemTap translator/driver (version 0.9.9/0.142 non-git sources)
$ stap -e 'probe syscall.epoll_wait { printf("%s\n", argstr) exit() }'
4, 0x0253d3e0, 64, 59743
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://sourceware.org/bugzilla/show_bug.cgi?id=10408
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