• Scott Wood's avatar
    powerpc: Convert some mftb/mftbu into mfspr · beb2dc0a
    Scott Wood authored
    Some CPUs (such as e500v1/v2) don't implement mftb and will take a
    trap.  mfspr should work on everything that has a timebase, and is the
    preferred instruction according to ISA v2.06.
    
    Currently we get away with mftb on 85xx because the assembler converts
    it to mfspr due to -Wa,-me500.  However, that flag has other effects
    that are undesireable for certain targets (e.g.  lwsync is converted to
    sync), and is hostile to multiplatform kernels.  Thus we would like to
    stop setting it for all e500-family builds.
    
    mftb/mftbu instances which are in 85xx code or common code are
    converted.  Instances which will never run on 85xx are left alone.
    Signed-off-by: default avatarScott Wood <scottwood@freescale.com>
    beb2dc0a
ppc_asm.h 23.3 KB