1 files changed, 86 insertions, 0 deletions
diff --git a/results/classifier/118/review/1955 b/results/classifier/118/review/1955
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@@ -0,0 +1,86 @@
+architecture: 0.916
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+performance: 0.806
+ppc: 0.803
+semantic: 0.801
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+permissions: 0.571
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+PID: 0.505
+peripherals: 0.432
+socket: 0.420
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+hypervisor: 0.377
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+mistranslation: 0.346
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+TCG: 0.269
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+virtual: 0.172
+x86: 0.148
+VMM: 0.147
+arm: 0.146
+i386: 0.111
+KVM: 0.107
+--------------------
+ppc: 0.244
+architecture: 0.110
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+arm: 0.001
+
+powerpc instruction 'mffsl' not emulated on POWER8
+Description of problem:
+Since 2019, the function feenableexcept() in GNU libc makes use of the "mffsl" instruction.
+See https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/powerpc/fpu/feenablxcpt.c;h=b111ceaa4e2e1864fcbe043ccda34e03e9f14062;hb=HEAD#l28
+and https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/powerpc/fpu/fenv_libc.h;h=a2a12d914b47e99746003482b349a0675cc5ad34;hb=HEAD#l57
+
+In the emulated Debian system, executables that make use of this instruction crash with SIGILL.
+Likewise, under gdb (in the emulated system), there is a SIGILL at the 'mffsl' instruction.
+
+From the comments in the above glibc source, added by Paul A. Clarke <pc@us.ibm.com>:
+  "Nicely, it turns out that the 'mffsl' instruction will decode to
+   'mffs' on architectures older than "power9" because the additional
+   bits set for 'mffsl' are "don't care" for 'mffs'.  'mffs' is a superset
+   of 'mffsl'."
+
+This is indeed what I observe by compiling and running the attached program foo.c on a hardware machine with a POWER8 CPU: That program does not crash with a SIGILL.
+Steps to reproduce:
+1. Either run the attached 'test-fenv-except-tracking-5.ppc' (32-bit) program under qemu-system-ppc.
+2. Or run the the attached 'test-fenv-except-tracking-5.ppc64' (64-bit) program under qemu-system-ppc64 with -cpu POWER8.
+3. Or compile and run the attached foo.c and run it under QEMU.
+Additional information:
+[test-fenv-except-tracking-5.ppc.xz](/uploads/8222ebac115e8a865d5e520b25d423ff/test-fenv-except-tracking-5.ppc.xz)
+
+[test-fenv-except-tracking-5.ppc64.xz](/uploads/d0522723541a46e11ab55b8f45dfb574/test-fenv-except-tracking-5.ppc64.xz)
+
+[foo.c](/uploads/35d8b3b1e5b39ecb6a2a899132858ded/foo.c)