cvs commit: src/sys/ia64/ia64 trap.c

[Marcel Moolenaar]

marcel      2003/12/09 01:52:15 PST

  FreeBSD src repository

  Modified files:
    sys/ia64/ia64        trap.c 
  Log:
  Don't panic for misalignment traps when the onfault handler is set.
  Not all transfers between kernel and user space are byte oriented
  and thus alignment safe. Especially fuword*() and suword*() are
  sensitive to alignment but in general more optimal than block copies.
  By catching the misalignment trap we avoid pessimizing the common
  case of properly aligned memory accesses which we would do if we
  were to use byte copies or adding tests for proper alignment.
  
  Note that the expectation that the kernel produces aligned pointers
  is unchanged. This change therefore relates to possible unaligned
  pointers generated in userland.
  
  Revision  Changes    Path
  1.95      +10 -1     src/sys/ia64/ia64/trap.c