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    • pw's avatar
      Changes for Linux running on Alpha. · 25b808fb
      pw authored
      From: Julian Dolby <dolby@csag-226-8.UCSD.EDU>
      
        Enclosed below are diffs against the cvs repository as of Feb 12;
      aside from minor changes like using different include files
      (e.g. validate.h instead of x86-validate.h in Linux-os.c) and adding
      alpha-linux specifics unix-glibc2.lisp, there are two code changes.
      
       The first is to signal handling. I had to put the POSIX-SIGS
      ifdefs into places used by alpha but not by x86, and I ifdef'ed out
      most of the linux #define kludges for signals for alpha linux, since
      alpha linux uses OSF/1 signals rather than linux ones.
      
       The second is that the trick of or'ing 2 into the reg_ALLOC address
      to cause faults does not work on alpha linux since the kernel traps
      and handles the unaligned access; I did not find a way to change that
      kernel behavior, so I changed the code to or (1<<63) into the address
      to cause a seg fault, and then check, in the seg fault handler, to see
      if the high-order address bits are set.
      
       One change I made is to the memory layout (lisp/alpha-validate.h and
      compiler/alpha/parms.lisp); that change is not needed to make lisp run
      on alpha linux, but is there because I wanted more heap space.
      25b808fb
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