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From: Bruce Evans <bde@FreeBSD.org>
Date: Sun, 3 Feb 2002 01:13:59 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/i386/i386 locore.s machdep.c src/sys/pc98/i386
         machdep.c
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bde         2002/02/03 01:13:59 PST

  Modified files:
    sys/i386/i386        locore.s machdep.c 
    sys/pc98/i386        machdep.c 
  Log:
  Use osigreturn(2) instead of sigreturn(2) plus broken magic for returning
  from old signal handlers.  This is simpler and faster, and fixes (new)
  sigreturn(2) when %eip in the new signal context happens to match the
  magic value (0x1d516).  0x1d516 is below the default ELF text section,
  so this probably never broken anything in practice.
  
  locore.s:
  In addition, don't build the signal trampoline for old signal handlers
  when it is not used.
  
  alpha:
  Not fixed, but seems to be even less broken in practice due to more
  advanced magic. A false match occurs for register #32 in mc_regs[].
  Since there is no hardware register #32, a false match is only possible
  for direct calls to sigreturn(2) that happen to have the magic number
  in the spare mc_regs[32] field.
  
  Revision  Changes    Path
  1.154     +7 -3      src/sys/i386/i386/locore.s
  1.492     +0 -9      src/sys/i386/i386/machdep.c
  1.257     +0 -9      src/sys/pc98/i386/machdep.c

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