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libunwind assumes all powerpc platforms have altivec and FPU #43137

Open Quuxplusone opened 4 years ago

Quuxplusone commented 4 years ago
Bugzilla Link PR44167
Status NEW
Importance P enhancement
Reported by Justin Hibbits (chmeeedalf@gmail.com)
Reported on 2019-11-27 14:02:22 -0800
Last modified on 2020-01-03 17:11:51 -0800
Version trunk
Hardware Other All
CC llvm-bugs@lists.llvm.org
Fixed by commit(s)
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UnwindRegistersSave.S includes unconditional saving and loading of floating point registers and altivec registers. However, not all PowerPC platforms have FPU or Altivec. The PowerPC e500 uses a non-standard FPU, the SPE, which uses the GPRs, and has no altivec. The PowerPC e500mc and e5500 have a FPU but no Altivec.

Quuxplusone commented 4 years ago

Also, PPC64_HAS_VMX really gates VSX, not VMX. The #else clause uses altivec, while the #if clause uses VSX. This makes it crash on the Freescale/NXP e5500 with an illegal instruction.