• Vineet Gupta's avatar
    ARCv2: entry: save Accumulator register pair (r58:59) if present · 3d5e8012
    Vineet Gupta authored
    Accumulator is present in configs with FPU and/or DSP MPY (mpy > 6)
    
    Instead of doing this in pt_regs (and thus every kernel entry/exit),
    this could have been done in context switch (and for user task only) as
    currently kernel doesn't clobber these registers for its own accord.
    However we will soon start using 64-bit multiply instructions for kernel
    which can clobber these. Also gcc folks also plan to start using these
    as GPRs, hence better to always save/restore them
    Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
    3d5e8012
ptrace.h 3.74 KB