+/* Implement the "dwarf2_reg_to_regnum" gdbarch method. */
+
+static int
+riscv_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
+{
+ if (reg < RISCV_DWARF_REGNUM_X31)
+ return RISCV_ZERO_REGNUM + (reg - RISCV_DWARF_REGNUM_X0);
+
+ else if (reg < RISCV_DWARF_REGNUM_F31)
+ return RISCV_FIRST_FP_REGNUM + (reg - RISCV_DWARF_REGNUM_F0);
+
+ return -1;
+}
+
+/* Implement the gcc_target_options method. We have to select the arch and abi
+ from the feature info. We have enough feature info to select the abi, but
+ not enough info for the arch given all of the possible architecture
+ extensions. So choose reasonable defaults for now. */
+
+static std::string
+riscv_gcc_target_options (struct gdbarch *gdbarch)
+{
+ int isa_xlen = riscv_isa_xlen (gdbarch);
+ int isa_flen = riscv_isa_flen (gdbarch);
+ int abi_xlen = riscv_abi_xlen (gdbarch);
+ int abi_flen = riscv_abi_flen (gdbarch);
+ std::string target_options;
+
+ target_options = "-march=rv";
+ if (isa_xlen == 8)
+ target_options += "64";
+ else
+ target_options += "32";
+ if (isa_flen == 8)
+ target_options += "gc";
+ else if (isa_flen == 4)
+ target_options += "imafc";
+ else
+ target_options += "imac";
+
+ target_options += " -mabi=";
+ if (abi_xlen == 8)
+ target_options += "lp64";
+ else
+ target_options += "ilp32";
+ if (abi_flen == 8)
+ target_options += "d";
+ else if (abi_flen == 4)
+ target_options += "f";
+
+ /* The gdb loader doesn't handle link-time relaxation relocations. */
+ target_options += " -mno-relax";
+
+ return target_options;
+}
+
+/* Implement the gnu_triplet_regexp method. A single compiler supports both
+ 32-bit and 64-bit code, and may be named riscv32 or riscv64 or (not
+ recommended) riscv. */
+
+static const char *
+riscv_gnu_triplet_regexp (struct gdbarch *gdbarch)
+{
+ return "riscv(32|64)?";
+}
+