Upstream tons of RISC-V changes.

These are all the changes from https://github.com/riscv/riscv-openocd
(approximately 91dc0c0c) made just to src/target/riscv/*. Some of the
new code is disabled because it requires some other target-independent
changes which I didn't want to include here.

Built like this, OpenOCD passes:
* All single-RV32 tests against spike.
* All single-RV64 tests against spike.
* Enough HiFive1 tests. (I suspect the failures are due to the test
suite rotting.)
* Many dual-RV32 (-rtos hwthread) against spike.
* Many dual-RV64 (-rtos hwthread) against spike.

I suspect this is an overall improvement compared to what's in mainline
right now, and it gets me a lot closer to getting all the riscv-openocd
work upstreamed.

Change-Id: Ide2f80c9397400780ff6780d78a206bc6a6e2f98
Signed-off-by: Tim Newsome <tim@sifive.com>
Reviewed-on: http://openocd.zylin.com/5821
Tested-by: jenkins
Reviewed-by: Jan Matyas <matyas@codasip.com>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Karl Palsson <karlp@tweak.net.au>

src/target/riscv/program.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 #ifndef TARGET__RISCV__PROGRAM_H
 #define TARGET__RISCV__PROGRAM_H
 
@@ -55,14 +57,18 @@ int riscv_program_save_to_dscratch(struct riscv_program *p, enum gdb_regno to_sa
 /* Helpers to assemble various instructions.  Return 0 on success.  These might
  * assemble into a multi-instruction sequence that overwrites some other
  * register, but those will be properly saved and restored. */
+int riscv_program_ldr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno a, int o);
 int riscv_program_lwr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno a, int o);
 int riscv_program_lhr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno a, int o);
 int riscv_program_lbr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno a, int o);
 
+int riscv_program_sdr(struct riscv_program *p, enum gdb_regno s, enum gdb_regno a, int o);
 int riscv_program_swr(struct riscv_program *p, enum gdb_regno s, enum gdb_regno a, int o);
 int riscv_program_shr(struct riscv_program *p, enum gdb_regno s, enum gdb_regno a, int o);
 int riscv_program_sbr(struct riscv_program *p, enum gdb_regno s, enum gdb_regno a, int o);
 
+int riscv_program_csrrsi(struct riscv_program *p, enum gdb_regno d, unsigned int z, enum gdb_regno csr);
+int riscv_program_csrrci(struct riscv_program *p, enum gdb_regno d, unsigned int z, enum gdb_regno csr);
 int riscv_program_csrr(struct riscv_program *p, enum gdb_regno d, enum gdb_regno csr);
 int riscv_program_csrw(struct riscv_program *p, enum gdb_regno s, enum gdb_regno csr);