Hi,
I'd like to provide a patch for VEX/priv/guest_x86_toIR.c such that running user
code that uses a 32-bit Goto BLAS library through memcheck (from the valgrind
3.5.0 release or earlier releases) does not issue a
> vex x86->IR: unhandled instruction bytes: 0xF 0xE 0x89 0xE6
> ==29436== valgrind: Unrecognised instruction at address 0x4124d04.
> ==29436== Your program just tried to execute an instruction that Valgrind
> ==29436== did not recognise. There are two possible reasons for this.
> ==29436== 1. Your program has a bug and erroneously jumped to a non-code
> ==29436== location. If you are running Memcheck and you just saw a
> ==29436== warning about a bad jump, it's probably your program's fault.
> ==29436== 2. The instruction is legitimate but Valgrind doesn't handle it,
> ==29436== i.e. it's Valgrind's fault. If you think this is the case or
> ==29436== you are not sure, please let us know and we'll try to fix it.
> ==29436== Either way, Valgrind will now raise a SIGILL signal which will
> ==29436== probably kill your program.
>
> Program received signal 4 (SIGILL): Illegal instruction.
any more.
The patch applies the same changes as the first patch for #124499 discussed in
http://bugs.kde.org/show_bug.cgi?id=124499 (comment #3) which subsequently made
it - along with other changes not required here - into the source code
(VEX/priv/guest_amd64_toIR.c) with revision 1604.
A sample code using the critical DTRSM BLAS function is attached. Get Goto BLAS
at http://www-prc.tacc.utexas.edu/resources/software/software.php?#blas, unpack,
compile it on a 32-bit Linux machine using ./quickbuild.32bit. Then, compile the
sample code, link it against Goto BLAS and run valgrind against it:
gfortran -g sample.f90 -lgoto
valgrind ./a.out
Without the patch, memcheck bails out.
with kind regards,
Sven
diff -Naur original/valgrind-3.5.0/VEX/priv/guest_x86_toIR.c
patched/valgrind-3.5.0/VEX/priv/guest_x86_toIR.c
--- original/valgrind-3.5.0/VEX/priv/guest_x86_toIR.c 2009-08-19
15:37:52.000000000 +0200
+++ patched/valgrind-3.5.0/VEX/priv/guest_x86_toIR.c 2009-08-20
10:35:41.000000000 +0200
@@ -14682,11 +14682,12 @@
break;
}
+ case 0x0E: /* FEMMS */
case 0x77: /* EMMS */
if (sz != 4)
goto decode_failure;
do_EMMS_preamble();
- DIP("emms\n");
+ DIP("{f}emms\n");
break;
/* =-=-=-=-=-=-=-=-=- unimp2 =-=-=-=-=-=-=-=-=-=-= */
program main
! example taken from
!
http://users.physik.tu-muenchen.de/gammel/matpack/html/Software/Blas/blas3_dtrsm.html
REAL*8 A(100,40), B(40,20), alpha
M = 16
N = 18
LDA = 100
LDB = 40
alpha = 2.0D0
CALL DTRSM ('L','U','N','U',M,N,alpha,A,LDA,B,LDB)
end program
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