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92528b6772
Adds riscv_linux_nat_target::read_description method to find a suitable target description for the native linux target we are running on. Currently this will supply a suitably sized set of x-registers, and will probe the kernel to see if the f-registers are readable. If they are readable then we currently assume that the f-registers are the same size as the x-registers as I don't know of a good way to probe the f-register length. This will obviously need fixing in future. As of Linux 4.19 there is no ptrace support for reading the f-registers, this should appear in 4.20, so right now we only return target descriptions without f-registers. gdb/ChangeLog: * riscv-linux-nat.c: Add 'inferior.h' and 'target-descriptions.h' header files. (riscv_linux_nat_target::read_description): New method.
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