Use arm target description and regs_info for 32-bit file on aarch64 GDBserver

[deliverable/binutils-gdb.git] / gdb / gdbserver / linux-aarch64-low.c

diff --git a/gdb/gdbserver/linux-aarch64-low.c b/gdb/gdbserver/linux-aarch64-low.c
index 3a47521e14ff16da5e38d7fd0e92d5d364a78f49..e4a41ce4718a642c26bf764de88e06e64558b54c 100644 (file)
--- a/gdb/gdbserver/linux-aarch64-low.c
+++ b/gdb/gdbserver/linux-aarch64-low.c
@@ -22,6 +22,7 @@
 #include "server.h"
 #include "linux-low.h"
 #include "nat/aarch64-linux-hw-point.h"
+#include "linux-aarch32-low.h"
 #include "elf/common.h"
 
 #include <signal.h>
@@ -69,6 +70,16 @@ struct arch_process_info
   struct aarch64_debug_reg_state debug_reg_state;
 };
 
+/* Return true if the size of register 0 is 8 byte.  */
+
+static int
+is_64bit_tdesc (void)
+{
+  struct regcache *regcache = get_thread_regcache (current_thread, 0);
+
+  return register_size (regcache->tdesc, 0) == 8;
+}
+
 /* Implementation of linux_target_ops method "cannot_store_register".  */
 
 static int
@@ -582,12 +593,32 @@ aarch64_linux_prepare_to_resume (struct lwp_info *lwp)
     }
 }
 
+/* Return the right target description according to the ELF file of
+   current thread.  */
+
+static const struct target_desc *
+aarch64_linux_read_description (void)
+{
+  unsigned int machine;
+  int is_elf64;
+  int tid;
+
+  tid = lwpid_of (current_thread);
+
+  is_elf64 = linux_pid_exe_is_elf_64_file (tid, &machine);
+
+  if (is_elf64)
+    return tdesc_aarch64;
+  else
+    return tdesc_arm_with_neon;
+}
+
 /* Implementation of linux_target_ops method "arch_setup".  */
 
 static void
 aarch64_arch_setup (void)
 {
-  current_process ()->tdesc = tdesc_aarch64;
+  current_process ()->tdesc = aarch64_linux_read_description ();
 
   aarch64_linux_get_debug_reg_capacity (lwpid_of (current_thread));
 }
@@ -611,7 +642,7 @@ static struct regsets_info aarch64_regsets_info =
     NULL, /* disabled_regsets */
   };
 
-static struct regs_info regs_info =
+static struct regs_info regs_info_aarch64 =
   {
     NULL, /* regset_bitmap */
     NULL, /* usrregs */
@@ -623,7 +654,10 @@ static struct regs_info regs_info =
 static const struct regs_info *
 aarch64_regs_info (void)
 {
-  return &regs_info;
+  if (is_64bit_tdesc ())
+    return &regs_info_aarch64;
+  else
+    return &regs_info_aarch32;
 }
 
 /* Implementation of linux_target_ops method "supports_tracepoints".  */
@@ -682,5 +716,7 @@ initialize_low_arch (void)
 {
   init_registers_aarch64 ();
 
+  initialize_low_arch_aarch32 ();
+
   initialize_regsets_info (&aarch64_regsets_info);
 }