RISC-V: Linux signal frame support.
Add support for recognizing signal trampolines, parsing the signal frame,
and reading register values from it.
gdb/
* riscv-linux-tdep.c: Include tramp-frame.h and trad-frame.h.
(riscv_linux_sigframe_init): Declare.
(RISCV_INST_LI_A7_SIGRETURN, RISCV_INT_ECALL): New.
(riscv_linux_sigframe): New.
(SIGFRAME_SIGINFO_SIZE, UCONTEXT_MCONTEXT_OFFSET): New.
(riscv_linux_sigframe_init): Define.
(riscv_linux_init_abi): Call tramp_frame_prepend_unwinder.
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