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From: Dimitry Andric <dim@FreeBSD.org>
Date: Tue, 4 Jan 2011 20:51:28 +0000 (UTC)
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Subject: cvs commit: src/libexec/rtld-elf/amd64 Makefile.inc
 src/libexec/rtld-elf/i386 Makefile.inc
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dim         2011-01-04 20:51:28 UTC

  FreeBSD src repository

  Modified files:
    libexec/rtld-elf/amd64 Makefile.inc 
    libexec/rtld-elf/i386 Makefile.inc 
  Log:
  SVN rev 216977 on 2011-01-04 20:51:28Z by dim
  
  On amd64 and i386, tell the compiler to refrain from generating SSE,
  3DNow, MMX and floating point instructions in rtld-elf.
  
  Otherwise, _rtld_bind() (and whatever it calls) could possibly clobber
  function arguments that are passed in SSE/3DNow/MMX/FP registers,
  usually floating point values.  This can happen, for example, when clang
  generates SSE code for memset() or memcpy() calls.
  
  One symptom of this is sshd dying early on amd64 with "PRNG not seeded",
  which is ultimately caused by libcrypto.so.6 calling RAND_add() with a
  double parameter.  That parameter is passed via %xmm0, which gets wiped
  out by an SSE memset() in _rtld_bind().
  
  Reviewed by:    kib, kan
  
  Revision  Changes    Path
  1.4       +1 -0      src/libexec/rtld-elf/amd64/Makefile.inc
  1.4       +1 -0      src/libexec/rtld-elf/i386/Makefile.inc