Determine target description for native aarch64

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

diff --git a/gdb/aarch64-linux-nat.c b/gdb/aarch64-linux-nat.c
index fe1631dbbb64209b47de5d6bdc4e2b3d3b5d0f9b..e4316376c525644d52894aa40bbd1ec1a3cff9c3 100644 (file)
--- a/gdb/aarch64-linux-nat.c
+++ b/gdb/aarch64-linux-nat.c
@@ -481,7 +481,6 @@ aarch64_linux_child_post_startup_inferior (struct target_ops *self,
   super_post_startup_inferior (self, ptid);
 }
 
-extern struct target_desc *tdesc_arm_with_vfpv3;
 extern struct target_desc *tdesc_arm_with_neon;
 
 /* Implement the "to_read_description" target_ops method.  */
@@ -489,47 +488,20 @@ extern struct target_desc *tdesc_arm_with_neon;
 static const struct target_desc *
 aarch64_linux_read_description (struct target_ops *ops)
 {
-  CORE_ADDR at_phent;
-
-  if (target_auxv_search (ops, AT_PHENT, &at_phent) == 1)
-    {
-      if (at_phent == sizeof (Elf64_External_Phdr))
-       return tdesc_aarch64;
-      else
-       {
-         CORE_ADDR arm_hwcap = 0;
-
-         if (target_auxv_search (ops, AT_HWCAP, &arm_hwcap) != 1)
-           return ops->beneath->to_read_description (ops->beneath);
-
-#ifndef COMPAT_HWCAP_VFP
-#define COMPAT_HWCAP_VFP        (1 << 6)
-#endif
-#ifndef COMPAT_HWCAP_NEON
-#define COMPAT_HWCAP_NEON       (1 << 12)
-#endif
-#ifndef COMPAT_HWCAP_VFPv3
-#define COMPAT_HWCAP_VFPv3      (1 << 13)
-#endif
-
-         if (arm_hwcap & COMPAT_HWCAP_VFP)
-           {
-             char *buf;
-             const struct target_desc *result = NULL;
-
-             if (arm_hwcap & COMPAT_HWCAP_NEON)
-               result = tdesc_arm_with_neon;
-             else if (arm_hwcap & COMPAT_HWCAP_VFPv3)
-               result = tdesc_arm_with_vfpv3;
+  int ret, tid;
+  gdb_byte regbuf[VFP_REGS_SIZE];
+  struct iovec iovec;
 
-             return result;
-           }
+  tid = ptid_get_lwp (inferior_ptid);
 
-         return NULL;
-       }
-    }
+  iovec.iov_base = regbuf;
+  iovec.iov_len = VFP_REGS_SIZE;
 
-  return tdesc_aarch64;
+  ret = ptrace (PTRACE_GETREGSET, tid, NT_ARM_VFP, &iovec);
+  if (ret == 0)
+    return tdesc_arm_with_neon;
+  else
+    return tdesc_aarch64;
 }
 
 /* Convert a native/host siginfo object, into/from the siginfo in the