target/loongarch: Add disassembler

This patch adds support for disassembling via option '-d in_asm'.

Signed-off-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-17-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/disas/dis-asm.h

@@ -253,6 +253,7 @@ enum bfd_architecture
 #define bfd_mach_rx            0x75
 #define bfd_mach_rx_v2         0x76
 #define bfd_mach_rx_v3         0x77
+  bfd_arch_loongarch,
   bfd_arch_last
   };
 #define bfd_mach_s390_31 31
@@ -458,6 +459,7 @@ int print_insn_riscv64          (bfd_vma, disassemble_info*);
 int print_insn_riscv128         (bfd_vma, disassemble_info*);
 int print_insn_rx(bfd_vma, disassemble_info *);
 int print_insn_hexagon(bfd_vma, disassemble_info *);
+int print_insn_loongarch(bfd_vma, disassemble_info *);
 
 #ifdef CONFIG_CAPSTONE
 bool cap_disas_target(disassemble_info *info, uint64_t pc, size_t size);

meson.build

@@ -2349,6 +2349,7 @@ disassemblers = {
   'sh4' : ['CONFIG_SH4_DIS'],
   'sparc' : ['CONFIG_SPARC_DIS'],
   'xtensa' : ['CONFIG_XTENSA_DIS'],
+  'loongarch' : ['CONFIG_LOONGARCH_DIS'],
 }
 if link_language == 'cpp'
   disassemblers += {