for linux save
some of the xmm registers. I suspect that they are compiling
this code with the ms_abi conventions. msabi needs to be
enabled to unwind through this code.
Regards,
Ariel Burton
diff -rup ./include/dwarf.h ../../libunwind/libunwind-1.1/include/dwarf.h
--- ./include/dwarf.h 2012-10
This attached patch, relative to libuninwd-1.0.1,
will fix building with --enable-msabi-support on linux x86_64.
Ariel Burton
diff -ur tmp/libunwind-1.0.1/src/x86_64/Gglobal.c libunwind-1.0.1/src/x86_64/Gglobal.c
--- tmp/libunwind-1.0.1/src/x86_64/Gglobal.c 2011-09-10 23:06:41.0 -0400
On Tue 11 Sep 11:07, Arun Sharma wrote:
> On Tue, Sep 11, 2012 at 9:37 AM, wrote:
>
> > Why is CONFIG_MSABI_SUPPORT a conditional? Why isn't on all
> > the time?
>
> http://git.savannah.gnu.org/gitweb/?p=libunwind.git;a=commitdiff;h=e09f9701ffcd05b097565d15daa87ac1b2d84299
>
> Support disable
Dear all,
There's a problem building libunwinwd-1.0.1 when configured
with --enable-msabi-support.
The problem occurs when compilation reaches src/x86_64/Lglobal.c,
because the symbols UNW_X86_64_XMM0, UNW_X86_64_XMM1 etc. are
undefined.
Lglobal.c reads:
#define UNW_LOCAL_ONLY
#include
#
The larger footprint is certainly a reasonable
explanation for a slow down.
Are those figures for local processing (i.e.,
introsepection), or from an external process?
What do you mean by `apply the patch, but diable it
by default'? Does that mean that a compile time
switch or a runtime switch?
Yes, that seems to work!
Thanks!
Ariel
==
On Thu 26 May 10:18, Arun Sharma wrote:
> On Tue, May 24, 2011 at 9:08 AM, Ariel Burton
> wrote:
> > Thanks for the prompt reply.
> >
> > Yes, that's what the compiler is doing. Here's the
> > assembler for th
Thanks for the prompt reply.
Yes, that's what the compiler is doing. Here's the
assembler for the prologue of f_ms_abi:
movdqa %xmm6, -176(%rbp)
movdqa %xmm7, -160(%rbp)
movdqa %xmm8, -144(%rbp)
movdqa %xmm9, -128(%rbp)
movdqa %xmm10, -112(%rbp)
Summary
===
libunwind is not correctly unwinding through frames for
functions annotated with the __attribute__((ms_abi)).
Platform
observed on x86-64, linux, and gcc
How to reproduce
build a standard, vanilla, instance of libunwind 0.99
compile and link
