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Correctly handle a0- registers. This allows debugging call0 code in linux natively. The register structure is the same for windowed and call0 ABIs because currently linux kernel internally requires windowed registers, so they are always present. gdb/ 2017-03-27 Max Filippov <jcmvbkbc@gmail.com> * xtensa-linux-nat.c (fill_gregset): Call regcache_raw_collect for a single specified register or for all registers in a0_base..a0_base + C0_NREGS range. (supply_gregset_reg): Call regcache_raw_supply for a single specified register or for all registers in a0_base..a0_base + C0_NREGS range.
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