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From: Carl E. L. <ce...@li...> - 2013-08-19 16:22:41
|
On Fri, 2013-08-16 at 18:39 -0500, Peter Bergner wrote:
>
> > In my implementation, the host executes the tbegin. I didn't do
> > anything to set or change the host TFIAR register. I capture the value
> > from the condition code register and write that into the guest machine's
> > condition code register.
>
> How do you capture the cr0 value? I ask, because as part of the code
> generation for the __builtin_tbegin builtin, I destroy it's value.
> The only way to get that value is through use of the __builtin_ttest()
> builtin, which returns the 4-bit value that was written to cr0 on
> completion of the tbegin...as long as you haven't executed any more HTM
> instructions in the mean time.
>
Valgrind generates instructions that are executed on the host. Below is
the code that generates the instructions for the tbegin instruction. The
first mkFormX() call adds the tbegin instruction to the sequence of instructions
to be executed. The mkFormXFX() add the instruction to copy the contents
of the TEXASR register to the variable r_dst. The second mkFormX() adds
the instruction to copy the condition register to the r_cond variable.
Once the sequence of instructions is executed, the value of r_dst (TEXASR)
and the condition code value (r_cond) is returned from this routine. The
values are then written into the register state for the guest. The guest is
the memory, register values for the specified program being run under Valgrind.
+ case Pin_TM: {
+ UInt r_dst = iregNo(i->Pin.TM.dst, mode64);
+ UInt r_cond = iregNo(i->Pin.TM.cc_dst, mode64);
+ UInt R_field = i->Pin.TM.R_field->Pri.Imm;
+
+ switch (i->Pin.TM.op) {
+ case Pfp_TBEGIN:
+ vex_printf (" >>>> CALLED Pin_TM, case Pfp_TBEGIN \n");
+ p = mkFormX(p, 31, 0, R_field, 0, 654, 1);
+
+ /* move TEXASR to return */
+ p = mkFormXFX(p, r_dst, 130, 339);
+
+ /* move CR to info to return it */
+ p = mkFormX(p, 31, r_cond, 0, 0, 19, 0);
+ break;
>
> > > * (if the transaction does not fail)
> > > the guest CPU arrives at T_END. It calls another dirty helper
> > > function which first does T_END on the host, then pops
> > > guest-fail-handler off the stack of handler addresses for
> > > the thread. The transaction is over.
> >
> > In my implementation the T_END instruction is actually a noop right now.
> > Looking at it again as I write this response I see this is an error in
> > my current implementation. I will fix it.
>
> If the host doesn't execute a tend., your host transaction will abort
> 100% of the time. No wonder things didn't work for you.
After I sent the message, I went back and checked out my code. When I
was writing the message I was quickly referring to the code to remind me
how this implementation was done. The TEND code in the patch is as
follows:
+ case 0x2AE: { //tend.
+ /* The tend. is just a noop. Do nothing */
+ UInt A = IFIELD( theInstr, 25, 1 );
+
+ DIP("tend. %d\n", A);
+ IRTemp rDst = newTemp(Ity_I128);
+
+ /* Treat all of the TM instructions as unops, arg is unused here */
+ assign( rDst, unop( Iop_TEND, mkU32( 0 ) ) );
+ break;
+ }
The comment says the tend is a noop. That is how it is implemented in
Julian's first proposal. When I read the comment, I was thinking I had forgotten
to issue the tend instruction as I said in my previous message. But when
I really looked at the code, I am generating the Iop for the TEND instruction.
I checked the code generation for handling the TEND and the tend instruction is
being generated/executed on the host CPU. So, it really is the comment that
is in error not the code. I fixed the comment and reran the test. The test
is taking the failure path. Unfortunately, the failure wasn't due to forgetting
to do the tend instruction on the underlying CPU.
Carl Love
|
|
From: Maran P. <ma...@li...> - 2013-08-19 09:11:17
|
On 08/16/2013 07:54 PM, Julian Seward wrote: >> I have implemented the second proposal for Power. [...] > I'm not sure I understand the details of how TM is presented in the Power > instruction set and architectural state. It seems broadly similar to the > Intel scheme, though, in which there are two basic primitives: > > T_BEGIN, which takes the failure handler address as a parameter > T_END In s390, there are 2 types of transactions 1) normal (nonconstrained) transactions and 2) constrained transactions Though s390 architecture does not mandate a failure-handler address to be specified in both kind of transactions, it might be safe to assume a failure-handler(fall back path) will be provided in case of normal transactions similar to the way Power does failure handling. So, the above said scheme could be adopted for s390 in nonconstrained transactions. However, constrained transactions, by definition, provides guaranteed completion of the transaction and hence a failure handler is not available. Also, contrained transactions are too restrictive in terms of the number of instructions, type of instructions, accessibilty of the storage operands and instructions etc. So, it is quite possible that an instrumented transaction block (always) fails which otherwise could succeed when executed natively. Since a failure handler is not available, I am not sure if constrained transactions could fit in this scheme. 1) Either we could explore to bring the transaction block into a basic block and remove the transaction primitives (TBEGINC (for constrained transactions) and TEND) - which could work as long as valgrind is single threaded. Or, 2) Try to simulate constrained transaction as a nonconstrained transaction where the host-fail-handler has to make sure that the transaction succeeds in normal cases. I have not made a feasibility study of any of the above schemes, however. -- Maran |
|
From: Philippe W. <phi...@sk...> - 2013-08-19 04:04:26
|
valgrind revision: 13503 VEX revision: 2744 C compiler: gcc (GCC) 4.7.2 20121109 (Red Hat 4.7.2-8) GDB: GNU gdb (GDB) Fedora (7.5.1-37.fc18) Assembler: GNU assembler version 2.23.51.0.1-7.fc18 20120806 C library: GNU C Library stable release version 2.16 uname -mrs: Linux 3.7.2-204.fc18.ppc64 ppc64 Vendor version: Fedora release 18 (Spherical Cow) Nightly build on gcc110 ( Fedora release 18 (Spherical Cow), ppc64 ) Started at 2013-08-18 20:00:11 PDT Ended at 2013-08-18 21:03:50 PDT Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 558 tests, 31 stderr failures, 3 stdout failures, 0 stderrB failures, 0 stdoutB failures, 2 post failures == memcheck/tests/linux/getregset (stdout) memcheck/tests/linux/getregset (stderr) memcheck/tests/ppc64/power_ISA2_05 (stdout) memcheck/tests/supp_unknown (stderr) memcheck/tests/varinfo6 (stderr) memcheck/tests/wrap8 (stdout) memcheck/tests/wrap8 (stderr) massif/tests/big-alloc (post) massif/tests/deep-D (post) helgrind/tests/annotate_rwlock (stderr) helgrind/tests/free_is_write (stderr) helgrind/tests/hg02_deadlock (stderr) helgrind/tests/hg03_inherit (stderr) helgrind/tests/hg04_race (stderr) helgrind/tests/hg05_race2 (stderr) helgrind/tests/locked_vs_unlocked1_fwd (stderr) helgrind/tests/locked_vs_unlocked1_rev (stderr) helgrind/tests/locked_vs_unlocked2 (stderr) helgrind/tests/locked_vs_unlocked3 (stderr) helgrind/tests/pth_barrier1 (stderr) helgrind/tests/pth_barrier2 (stderr) helgrind/tests/pth_barrier3 (stderr) helgrind/tests/pth_destroy_cond (stderr) helgrind/tests/rwlock_race (stderr) helgrind/tests/tc01_simple_race (stderr) helgrind/tests/tc05_simple_race (stderr) helgrind/tests/tc06_two_races (stderr) helgrind/tests/tc06_two_races_xml (stderr) helgrind/tests/tc09_bad_unlock (stderr) helgrind/tests/tc14_laog_dinphils (stderr) helgrind/tests/tc16_byterace (stderr) helgrind/tests/tc18_semabuse (stderr) helgrind/tests/tc19_shadowmem (stderr) helgrind/tests/tc20_verifywrap (stderr) helgrind/tests/tc21_pthonce (stderr) helgrind/tests/tc22_exit_w_lock (stderr) |
|
From: Tom H. <to...@co...> - 2013-08-19 03:25:08
|
valgrind revision: 13503 VEX revision: 2744 C compiler: gcc (GCC) 4.3.0 20080428 (Red Hat 4.3.0-8) GDB: Assembler: GNU assembler version 2.18.50.0.6-2 20080403 C library: GNU C Library stable release version 2.8 uname -mrs: Linux 3.9.5-301.fc19.x86_64 x86_64 Vendor version: Fedora release 9 (Sulphur) Nightly build on bristol ( x86_64, Fedora 9 ) Started at 2013-08-19 03:52:39 BST Ended at 2013-08-19 04:24:52 BST Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 637 tests, 1 stderr failure, 1 stdout failure, 0 stderrB failures, 0 stdoutB failures, 0 post failures == memcheck/tests/amd64/insn-pcmpistri (stderr) none/tests/amd64/sse4-64 (stdout) |
|
From: Tom H. <to...@co...> - 2013-08-19 03:17:44
|
valgrind revision: 13503 VEX revision: 2744 C compiler: gcc (GCC) 4.4.1 20090725 (Red Hat 4.4.1-2) GDB: Assembler: GNU assembler version 2.19.51.0.14-3.fc11 20090722 C library: GNU C Library stable release version 2.10.2 uname -mrs: Linux 3.9.5-301.fc19.x86_64 x86_64 Vendor version: Fedora release 11 (Leonidas) Nightly build on bristol ( x86_64, Fedora 11 ) Started at 2013-08-19 03:42:10 BST Ended at 2013-08-19 04:17:27 BST Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 639 tests, 1 stderr failure, 1 stdout failure, 0 stderrB failures, 0 stdoutB failures, 0 post failures == memcheck/tests/long_namespace_xml (stderr) none/tests/amd64/sse4-64 (stdout) |
|
From: Tom H. <to...@co...> - 2013-08-19 03:09:44
|
valgrind revision: 13503 VEX revision: 2744 C compiler: gcc (GCC) 4.4.5 20101112 (Red Hat 4.4.5-2) GDB: Assembler: GNU assembler version 2.20.51.0.2-20.fc13 20091009 C library: GNU C Library stable release version 2.12.2 uname -mrs: Linux 3.9.5-301.fc19.x86_64 x86_64 Vendor version: Fedora release 13 (Goddard) Nightly build on bristol ( x86_64, Fedora 13 ) Started at 2013-08-19 03:32:32 BST Ended at 2013-08-19 04:09:30 BST Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 639 tests, 1 stderr failure, 0 stdout failures, 0 stderrB failures, 0 stdoutB failures, 0 post failures == helgrind/tests/pth_barrier3 (stderr) |
|
From: Tom H. <to...@co...> - 2013-08-19 03:04:39
|
valgrind revision: 13503 VEX revision: 2744 C compiler: gcc (GCC) 4.5.1 20100924 (Red Hat 4.5.1-4) GDB: GNU gdb (GDB) Fedora (7.2-52.fc14) Assembler: GNU assembler version 2.20.51.0.7-8.fc14 20100318 C library: GNU C Library stable release version 2.13 uname -mrs: Linux 3.9.5-301.fc19.x86_64 x86_64 Vendor version: Fedora release 14 (Laughlin) Nightly build on bristol ( x86_64, Fedora 14 ) Started at 2013-08-19 03:23:14 BST Ended at 2013-08-19 04:04:24 BST Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 658 tests, 1 stderr failure, 0 stdout failures, 0 stderrB failures, 0 stdoutB failures, 0 post failures == memcheck/tests/origin5-bz2 (stderr) |
|
From: Tom H. <to...@co...> - 2013-08-19 02:59:09
|
valgrind revision: 13503 VEX revision: 2744 C compiler: gcc (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2) GDB: GNU gdb (GDB) Fedora (7.3.50.20110722-16.fc16) Assembler: GNU assembler version 2.21.53.0.1-6.fc16 20110716 C library: GNU C Library development release version 2.14.90 uname -mrs: Linux 3.9.5-301.fc19.x86_64 x86_64 Vendor version: Fedora release 16 (Verne) Nightly build on bristol ( x86_64, Fedora 16 ) Started at 2013-08-19 03:02:55 BST Ended at 2013-08-19 03:58:50 BST Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 660 tests, 1 stderr failure, 0 stdout failures, 0 stderrB failures, 0 stdoutB failures, 0 post failures == memcheck/tests/origin5-bz2 (stderr) |
|
From: Tom H. <to...@co...> - 2013-08-19 02:58:33
|
valgrind revision: 13503 VEX revision: 2744 C compiler: gcc (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2) GDB: GNU gdb (GDB) Fedora (7.3.1-48.fc15) Assembler: GNU assembler version 2.21.51.0.6-6.fc15 20110118 C library: GNU C Library stable release version 2.14.1 uname -mrs: Linux 3.9.5-301.fc19.x86_64 x86_64 Vendor version: Fedora release 15 (Lovelock) Nightly build on bristol ( x86_64, Fedora 15 ) Started at 2013-08-19 03:14:20 BST Ended at 2013-08-19 03:58:16 BST Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 660 tests, 1 stderr failure, 0 stdout failures, 0 stderrB failures, 0 stdoutB failures, 0 post failures == memcheck/tests/origin5-bz2 (stderr) |
|
From: Tom H. <to...@co...> - 2013-08-19 02:38:43
|
valgrind revision: 13503 VEX revision: 2744 C compiler: gcc (GCC) 4.7.2 20120921 (Red Hat 4.7.2-2) GDB: GNU gdb (GDB) Fedora (7.4.50.20120120-54.fc17) Assembler: GNU assembler version 2.22.52.0.1-10.fc17 20120131 C library: GNU C Library stable release version 2.15 uname -mrs: Linux 3.9.5-301.fc19.x86_64 x86_64 Vendor version: Fedora release 17 (Beefy Miracle) Nightly build on bristol ( x86_64, Fedora 17 (Beefy Miracle) ) Started at 2013-08-19 02:51:40 BST Ended at 2013-08-19 03:38:15 BST Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 660 tests, 5 stderr failures, 1 stdout failure, 0 stderrB failures, 0 stdoutB failures, 0 post failures == gdbserver_tests/mcinfcallRU (stderr) gdbserver_tests/mcinfcallWSRU (stderr) gdbserver_tests/mcmain_pic (stderr) memcheck/tests/origin5-bz2 (stderr) exp-sgcheck/tests/preen_invars (stdout) exp-sgcheck/tests/preen_invars (stderr) |
|
From: Tom H. <to...@co...> - 2013-08-19 02:26:29
|
valgrind revision: 13503 VEX revision: 2744 C compiler: gcc (GCC) 4.7.2 20121109 (Red Hat 4.7.2-8) GDB: GNU gdb (GDB) Fedora (7.5.1-38.fc18) Assembler: GNU assembler version 2.23.51.0.1-10.fc18 20120806 C library: GNU C Library stable release version 2.16 uname -mrs: Linux 3.9.5-301.fc19.x86_64 x86_64 Vendor version: Fedora release 18 (Spherical Cow) Nightly build on bristol ( x86_64, Fedora 18 (Spherical Cow) ) Started at 2013-08-19 02:41:44 BST Ended at 2013-08-19 03:26:03 BST Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 660 tests, 2 stderr failures, 1 stdout failure, 0 stderrB failures, 0 stdoutB failures, 0 post failures == memcheck/tests/origin5-bz2 (stderr) exp-sgcheck/tests/preen_invars (stdout) exp-sgcheck/tests/preen_invars (stderr) |
|
From: Maran P. <ma...@li...> - 2013-08-19 02:23:04
|
valgrind revision: 13503 VEX revision: 2744 C compiler: gcc (SUSE Linux) 4.3.4 [gcc-4_3-branch revision 152973] GDB: GNU gdb (GDB) SUSE (7.3-0.6.1) Assembler: GNU assembler (GNU Binutils; SUSE Linux Enterprise 11) 2.21.1 C library: GNU C Library stable release version 2.11.3 (20110527) uname -mrs: Linux 3.0.80-0.7-default s390x Vendor version: Welcome to SUSE Linux Enterprise Server 11 SP2 (s390x) - Kernel %r (%t). Nightly build on sless390 ( SUSE Linux Enterprise Server 11 SP1 gcc 4.3.4 on z196 (s390x) ) Started at 2013-08-19 03:45:01 CEST Ended at 2013-08-19 04:22:52 CEST Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... done Regression test results follow == 636 tests, 0 stderr failures, 0 stdout failures, 0 stderrB failures, 0 stdoutB failures, 0 post failures == |
|
From: Tom H. <to...@co...> - 2013-08-19 02:09:16
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valgrind revision: 13503 VEX revision: 2744 C compiler: gcc (GCC) 4.8.1 20130603 (Red Hat 4.8.1-1) GDB: GNU gdb (GDB) Fedora (7.6-34.fc19) Assembler: GNU assembler version 2.23.52.0.1-9.fc19 20130226 C library: GNU C Library (GNU libc) stable release version 2.17 uname -mrs: Linux 3.9.5-301.fc19.x86_64 x86_64 Vendor version: Fedora release 19 (Schrödingerâs Cat) Nightly build on bristol ( x86_64, Fedora 19 (Schrödingerâs Cat) ) Started at 2013-08-19 02:32:03 BST Ended at 2013-08-19 03:08:56 BST Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 660 tests, 3 stderr failures, 0 stdout failures, 0 stderrB failures, 0 stdoutB failures, 0 post failures == memcheck/tests/dw4 (stderr) memcheck/tests/origin5-bz2 (stderr) exp-sgcheck/tests/hackedbz2 (stderr) |