diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index b94ccb2..6d0c3bd 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -1000,8 +1000,12 @@ aarch64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   linux_init_abi (info, gdbarch);
 
-  set_solib_svr4_fetch_link_map_offsets (gdbarch,
-					 svr4_lp64_fetch_link_map_offsets);
+  if (tdep->ilp32)
+    set_solib_svr4_fetch_link_map_offsets (gdbarch,
+					   svr4_ilp32_fetch_link_map_offsets);
+  else
+    set_solib_svr4_fetch_link_map_offsets (gdbarch,
+					   svr4_lp64_fetch_link_map_offsets);
 
   /* Enable TLS support.  */
   set_gdbarch_fetch_tls_load_module_address (gdbarch,
diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index 801c03d..bc6b0be 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -2091,6 +2091,22 @@ aarch64_gen_return_address (struct gdbarch *gdbarch,
 }
 
 
+/* Implement the "register_type" gdbarch method.
+   Adjust the register type of $PC and $SP on ILP32.  */
+
+static struct type *
+aarch64_ilp32_register_type (struct gdbarch *gdbarch, int regnum)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  gdb_assert (tdep->ilp32);
+
+  if (regnum == AARCH64_SP_REGNUM || regnum == AARCH64_PC_REGNUM)
+    return builtin_type (gdbarch)->builtin_uint64;
+  else
+    return tdesc_register_type (gdbarch, regnum);
+}
+
 /* Return the pseudo register name corresponding to register regnum.  */
 
 static const char *
@@ -2851,6 +2867,10 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   const struct tdesc_feature *feature;
   int num_regs = 0;
   int num_pseudo_regs = 0;
+  bool ilp32 = FALSE;
+
+  if (info.bfd_arch_info->mach == bfd_mach_aarch64_ilp32)
+    ilp32 = TRUE;
 
   /* Ensure we always have a target descriptor.  */
   if (!tdesc_has_registers (tdesc))
@@ -2908,6 +2928,9 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
        best_arch != NULL;
        best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info))
     {
+      /* ILP32 and LP64 are incompatible. */
+      if (gdbarch_tdep (arches->gdbarch)->ilp32 != ilp32)
+	continue;
       /* Found a match.  */
       break;
     }
@@ -2926,6 +2949,7 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   tdep->lowest_pc = 0x20;
   tdep->jb_pc = -1;		/* Longjump support not enabled by default.  */
   tdep->jb_elt_size = 8;
+  tdep->ilp32 = ilp32;
 
   set_gdbarch_push_dummy_call (gdbarch, aarch64_push_dummy_call);
   set_gdbarch_frame_align (gdbarch, aarch64_frame_align);
@@ -2968,9 +2992,9 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_gdbarch_float_bit (gdbarch, 32);
   set_gdbarch_double_bit (gdbarch, 64);
   set_gdbarch_long_double_bit (gdbarch, 128);
-  set_gdbarch_long_bit (gdbarch, 64);
+  set_gdbarch_long_bit (gdbarch, ilp32 ? 32 : 64);
   set_gdbarch_long_long_bit (gdbarch, 64);
-  set_gdbarch_ptr_bit (gdbarch, 64);
+  set_gdbarch_ptr_bit (gdbarch, ilp32 ? 32 : 64);
   set_gdbarch_char_signed (gdbarch, 0);
   set_gdbarch_float_format (gdbarch, floatformats_ieee_single);
   set_gdbarch_double_format (gdbarch, floatformats_ieee_double);
@@ -3012,6 +3036,13 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 
   tdesc_use_registers (gdbarch, tdesc, tdesc_data);
 
+  if (ilp32)
+    {
+      /* Override tdesc_register_type to adjust the types of $PC and
+	 $SP in ILP32.  */
+      set_gdbarch_register_type (gdbarch, aarch64_ilp32_register_type);
+    }
+
   /* Add standard register aliases.  */
   for (i = 0; i < ARRAY_SIZE (aarch64_register_aliases); i++)
     user_reg_add (gdbarch, aarch64_register_aliases[i].name,
diff --git a/gdb/aarch64-tdep.h b/gdb/aarch64-tdep.h
index 85c6a97..87d36b6 100644
--- a/gdb/aarch64-tdep.h
+++ b/gdb/aarch64-tdep.h
@@ -97,6 +97,9 @@ struct gdbarch_tdep
 
   /* syscall record.  */
   int (*aarch64_syscall_record) (struct regcache *regcache, unsigned long svc_number);
+  /* If this is ILP32 or LP64.  */
+  bool ilp32;
+
 };
 
 extern struct target_desc *tdesc_aarch64;
diff --git a/gdb/gdbserver/linux-aarch64-low.c b/gdb/gdbserver/linux-aarch64-low.c
index 334310b..e31d5c5 100644
--- a/gdb/gdbserver/linux-aarch64-low.c
+++ b/gdb/gdbserver/linux-aarch64-low.c
@@ -484,7 +484,12 @@ aarch64_linux_read_description (void)
 
   is_elf64 = linux_pid_exe_is_elf_64_file (tid, &machine);
 
-  if (is_elf64)
+  /* There are problems with ptrace when gdbserver is 32 bits and the
+     program being debugged is 64 bits.  */
+  if (sizeof (void *) == 4 && is_elf64)
+    error (_("Can't debug 64-bit process with 32-bit GDBserver"));
+
+  if (machine == EM_AARCH64)
     return tdesc_aarch64;
   else
     return tdesc_arm_with_neon;