* [Bug runtime/10272] New: backtraces fail with 32-on-64 executables
@ 2009-06-12 21:06 mjw at redhat dot com
2009-06-26 13:20 ` [Bug runtime/10272] " mjw at redhat dot com
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: mjw at redhat dot com @ 2009-06-12 21:06 UTC (permalink / raw)
To: systemtap
exelib.exp contains a (currently disabled) testcase.
# BUG! non-default arch breaks ustack tests.
#switch -regexp $::tcl_platform(machine) {
# {^(x86_64|ppc64)$} { lappend arches "-m32" }
# {^s390x$} { lappend arches "-m31" }
#}
--
Summary: backtraces fail with 32-on-64 executables
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: runtime
AssignedTo: systemtap at sources dot redhat dot com
ReportedBy: mjw at redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=10272
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* [Bug runtime/10272] backtraces fail with 32-on-64 executables
2009-06-12 21:06 [Bug runtime/10272] New: backtraces fail with 32-on-64 executables mjw at redhat dot com
@ 2009-06-26 13:20 ` mjw at redhat dot com
2010-01-18 20:19 ` fche at redhat dot com
2010-07-21 19:02 ` mjw at redhat dot com
2 siblings, 0 replies; 5+ messages in thread
From: mjw at redhat dot com @ 2009-06-26 13:20 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mjw at redhat dot com 2009-06-26 13:20 -------
The reason is that the runtime/unwind.c unwinder hard codes the assumption that
it is using the native (64 bit) register set, it even "sanity checks" that
register widths are equal to sizeof(unsigned long)...
--
http://sourceware.org/bugzilla/show_bug.cgi?id=10272
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* [Bug runtime/10272] backtraces fail with 32-on-64 executables
2009-06-12 21:06 [Bug runtime/10272] New: backtraces fail with 32-on-64 executables mjw at redhat dot com
2009-06-26 13:20 ` [Bug runtime/10272] " mjw at redhat dot com
@ 2010-01-18 20:19 ` fche at redhat dot com
2010-07-21 19:02 ` mjw at redhat dot com
2 siblings, 0 replies; 5+ messages in thread
From: fche at redhat dot com @ 2010-01-18 20:19 UTC (permalink / raw)
To: systemtap
--
What |Removed |Added
----------------------------------------------------------------------------
OtherBugsDependingO| |11179
nThis| |
http://sourceware.org/bugzilla/show_bug.cgi?id=10272
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* [Bug runtime/10272] backtraces fail with 32-on-64 executables
2009-06-12 21:06 [Bug runtime/10272] New: backtraces fail with 32-on-64 executables mjw at redhat dot com
2009-06-26 13:20 ` [Bug runtime/10272] " mjw at redhat dot com
2010-01-18 20:19 ` fche at redhat dot com
@ 2010-07-21 19:02 ` mjw at redhat dot com
2 siblings, 0 replies; 5+ messages in thread
From: mjw at redhat dot com @ 2010-07-21 19:02 UTC (permalink / raw)
To: systemtap
------- Additional Comments From mjw at redhat dot com 2010-07-21 19:02 -------
The original unwinder was written for in-kernel unwinding, so it hard codes
assumptions about register wides.
The reg_info struct that defines the knowledge about offsets and widths of
registers is defined in runtime/unwind/unwind.h. This file includes an
architecture specific header file (only i386.h and x86_64.h) that defines the
actual UNW_REGISTER_INFO used. Make sure to check the EXTRA_INFO and PTREGS_INFO
defines in unwind.h that extract the information as compile time constants from
architecture struct pt_regs in the unwind_frame_info struct. The unwinder works
by initializing a architecture specific struct unwind_frame_info with a pt_regs
struct which the unwinder then adjusts to show the state for previous frame (you
can then feed that back into the unwinder to unwind further).
The runtime/unwinder.c has some "sanity checks" like:
unsigned long value = 0;
#ifdef CONFIG_64BIT
BUILD_BUG_ON(sizeof(u64) != sizeof(value));
#else
BUILD_BUG_ON(sizeof(u32) != sizeof(value));
#endif
And checks for registers widths like:
if (reg_info[retAddrReg].width != sizeof(unsigned long)) goto err;
It als uses compile time constant sizeofs to initialize and copy stuff:
memcpy(&state->cfa, &badCFA, sizeof(state->cfa));
memset(state->regs, 0, sizeof(state->regs));
tableSize = sizeof(unsigned long);
To update the actual registers it has code like:
#define FRAME_REG(r, t) (((t *)frame)[reg_info[r].offs])
#ifndef CONFIG_64BIT
# define CASES CASE(8); CASE(16); CASE(32)
#else
# define CASES CASE(8); CASE(16); CASE(32); CASE(64)
#endif
case Register:
switch (reg_info[i].width) {
#define CASE(n) case sizeof(u##n): \
FRAME_REG(i, u##n) = state.regs[i].value; \
break
CASES;
#undef CASE
--
http://sourceware.org/bugzilla/show_bug.cgi?id=10272
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* [Bug runtime/10272] backtraces fail with 32-on-64 executables
[not found] <bug-10272-6586@http.sourceware.org/bugzilla/>
@ 2013-06-17 18:02 ` lberk at redhat dot com
0 siblings, 0 replies; 5+ messages in thread
From: lberk at redhat dot com @ 2013-06-17 18:02 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=10272
Lukas Berk <lberk at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |lberk at redhat dot com
Assignee|systemtap at sourceware dot org |lberk at redhat dot com
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end of thread, other threads:[~2013-06-17 18:02 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-06-12 21:06 [Bug runtime/10272] New: backtraces fail with 32-on-64 executables mjw at redhat dot com
2009-06-26 13:20 ` [Bug runtime/10272] " mjw at redhat dot com
2010-01-18 20:19 ` fche at redhat dot com
2010-07-21 19:02 ` mjw at redhat dot com
[not found] <bug-10272-6586@http.sourceware.org/bugzilla/>
2013-06-17 18:02 ` lberk at redhat dot com
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