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On a zEC12 or z13, a glibc with lock elision enabled infers from HWCAP
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that the prerequisites for lock elision are met. Then it may use TBEGIN
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and other transactional-execution instructions which are not implemented
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by Valgrind. Likewise, the upcoming glibc 2.23 will exploit vector
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instructions if they are advertised by HWCAP; and those are currently
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not implemented by Valgrind either. In general, the increased use of
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ifunc may lead to more such cases in the future.
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This patch suppresses the advertising of those hardware features via
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HWCAP which are either not known to Valgrind or currently unsupported.
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0ab3a1 |
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Patch by Andreas Arnez (arnez@linux.vnet.ibm.com).
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Fixes BZ #353680.
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Modified: trunk/README.s390
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==============================================================================
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--- trunk/README.s390 (original)
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+++ trunk/README.s390 Mon Oct 12 21:35:56 2015
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@@ -22,6 +22,9 @@
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- Some gcc versions use mvc to copy 4/8 byte values. This will affect
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certain debug messages. For example, memcheck will complain about
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0ab3a1 |
4 one-byte reads/writes instead of just a single read/write.
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+- The transactional-execution facility is not supported; it is masked
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+ off from HWCAP.
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+- The vector facility is not supported; it is masked off from HWCAP.
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0ab3a1 |
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0ab3a1 |
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Hardware facilities
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0ab3a1 |
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Modified: trunk/coregrind/m_initimg/initimg-linux.c
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0ab3a1 |
==============================================================================
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0ab3a1 |
--- trunk/coregrind/m_initimg/initimg-linux.c (original)
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0ab3a1 |
+++ trunk/coregrind/m_initimg/initimg-linux.c Mon Oct 12 21:35:56 2015
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0ab3a1 |
@@ -701,6 +701,12 @@
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in syswrap-arm-linux.c rather than to base this on
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conditional compilation. */
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0ab3a1 |
}
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+# elif defined(VGP_s390x_linux)
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+ {
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+ /* Advertise hardware features "below" TE only. TE and VXRS
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+ (and anything above) are not supported by Valgrind. */
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+ auxv->u.a_val &= VKI_HWCAP_S390_TE - 1;
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+ }
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# endif
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break;
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0ab3a1 |
# if defined(VGP_ppc64be_linux) || defined(VGP_ppc64le_linux)
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0ab3a1 |
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0ab3a1 |
Modified: trunk/include/vki/vki-s390x-linux.h
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0ab3a1 |
==============================================================================
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0ab3a1 |
--- trunk/include/vki/vki-s390x-linux.h (original)
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0ab3a1 |
+++ trunk/include/vki/vki-s390x-linux.h Mon Oct 12 21:35:56 2015
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0ab3a1 |
@@ -800,12 +800,15 @@
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0ab3a1 |
#define VKI_PTRACE_POKEUSR_AREA 0x5001
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0ab3a1 |
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0ab3a1 |
//----------------------------------------------------------------------
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0ab3a1 |
-// From linux-2.6.16.60/include/asm-s390/elf.h
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0ab3a1 |
+// From linux-3.18/include/asm-s390/elf.h
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0ab3a1 |
//----------------------------------------------------------------------
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0ab3a1 |
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0ab3a1 |
typedef vki_s390_fp_regs vki_elf_fpregset_t;
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0ab3a1 |
typedef vki_s390_regs vki_elf_gregset_t;
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0ab3a1 |
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0ab3a1 |
+#define VKI_HWCAP_S390_TE 1024
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0ab3a1 |
+#define VKI_HWCAP_S390_VXRS 2048
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0ab3a1 |
+
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0ab3a1 |
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0ab3a1 |
//----------------------------------------------------------------------
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0ab3a1 |
// From linux-2.6.16.60/include/asm-s390/ucontext.h
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0ab3a1 |
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0ab3a1 |
|