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The `org.gnu.gdb.nds32.core' feature is required for NDS32 targets. It should contain at least registers `r0' through `r10', `r15', `fp', `gp', `lp', `sp', and `pc'.
The `org.gnu.gdb.nds32.fpu' feature is optional. If present, it should contain 64-bit double-precision floating-point registers `fd0' through fdN, which should be `fd3', `fd7', `fd15', or `fd31' based on the FPU configuration implemented.
Note: The first sixteen 64-bit double-precision floating-point registers are overlapped with the thirty-two 32-bit single-precision floating-point registers. The 32-bit single-precision registers, if not being listed explicitly, will be synthesized from halves of the overlapping 64-bit double-precision registers. Listing 32-bit single-precision registers explicitly is deprecated, and the support to it could be totally removed some day.