• Mikulas Patocka's avatar
    parisc: fix bugs in pa_memcpy · 1681bab7
    Mikulas Patocka authored
    commit 409c1b25 upstream.
    
    The patch 554bfece ("parisc: Fix access
    fault handling in pa_memcpy()") reimplements the pa_memcpy function.
    Unfortunatelly, it makes the kernel unbootable. The crash happens in the
    function ide_complete_cmd where memcpy is called with the same source
    and destination address.
    
    This patch fixes a few bugs in pa_memcpy:
    
    * When jumping to .Lcopy_loop_16 for the first time, don't skip the
      instruction "ldi 31,t0" (this bug made the kernel unbootable)
    * Use the COND macro when comparing length, so that the comparison is
      64-bit (a theoretical issue, in case the length is greater than
      0xffffffff)
    * Don't use the COND macro after the "extru" instruction (the PA-RISC
      specification says that the upper 32-bits of extru result are undefined,
      although they are set to zero in practice)
    * Fix exception addresses in .Lcopy16_fault and .Lcopy8_fault
    * Rename .Lcopy_loop_4 to .Lcopy_loop_8 (so that it is consistent with
      .Lcopy8_fault)
    
    Fixes: 554bfece ("parisc: Fix access fault handling in pa_memcpy()")
    Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
    Signed-off-by: default avatarHelge Deller <deller@gmx.de>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    1681bab7
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