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diff --git a/linux/host_dasm.c b/linux/host_dasm.c
index d35bc9f..66a83ea 100644
--- a/linux/host_dasm.c
+++ b/linux/host_dasm.c
@@ -25,12 +25,20 @@ static struct disassemble_info di;
 #ifdef __arm__
 #define print_insn_func print_insn_little_arm
 #define BFD_ARCH bfd_arch_arm
-#define BFD_MACH bfd_mach_arm_4T
-#else
+#define BFD_MACH bfd_mach_arm_unknown
+#define DASM_OPTS "reg-names-std"
+#elif defined(__x86_64__) || defined(__i386__)
 #define print_insn_func print_insn_i386_intel
 #define BFD_ARCH bfd_arch_i386
+#ifdef __x86_64__
+#define BFD_MACH bfd_mach_x86_64_intel_syntax
+#else
 #define BFD_MACH bfd_mach_i386_i386_intel_syntax
 #endif
+#define DASM_OPTS NULL
+#else
+#error "missing arch support"
+#endif
 
 /* symbols */
 static asymbol **symbols;
@@ -132,7 +140,7 @@ static int
 dis_asm_read_memory(bfd_vma memaddr, bfd_byte *myaddr, unsigned int len,
                      struct disassemble_info *info)
 {
-  memcpy(myaddr, (void *)(int)memaddr, len);
+  memcpy(myaddr, (void *)(long)memaddr, len);
   return 0;
 }
 
@@ -140,7 +148,7 @@ static void
 dis_asm_memory_error(int status, bfd_vma memaddr,
                       struct disassemble_info *info)
 {
-  fprintf(stderr, "memory_error %p\n", (void *)(int)memaddr);
+  fprintf(stderr, "memory_error %p\n", (void *)(long)memaddr);
 }
 
 static void
@@ -181,6 +189,7 @@ static void host_dasm_init(void)
   di.arch = BFD_ARCH;
   di.mach = BFD_MACH;
   di.endian = BFD_ENDIAN_LITTLE;
+  di.disassembler_options = DASM_OPTS;
   disassemble_init_for_target(&di);
   init_done = 1;
 }