[binutils-gdb] [AArch64] Implement gdbarch_core_read_description

[Jiong Wang <jiwang at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=b1a6c1cea365f80b90c0bca795c8d16fa0681560

commit b1a6c1cea365f80b90c0bca795c8d16fa0681560
Author: Jiong Wang <jiong.wang@arm.com>
Date:   Wed Aug 9 15:37:20 2017 +0100

    [AArch64] Implement gdbarch_core_read_description
    
    Currently, AArch64 only have one target description which is tdesc_aarch64.  So,
    we haven't implemented any target description detection mechanism for core file.
    
    This patch is an initial implementation of core_read_description method.  Future
    features can use this to return selected description.
    
    gdb/
    	* aarch64-linux-tdep.c (aarch64_linux_core_read_description): New
    	function.
    	(aarch64_linux_init_abi): Register gdbarch_core_read_description.

Diff:
---
 gdb/ChangeLog            |  6 ++++++
 gdb/aarch64-linux-tdep.c | 16 ++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 7841101..516e39a 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2017-08-09  Jiong Wang  <jiong.wang@arm.com>
+
+	* aarch64-linux-tdep.c (aarch64_linux_core_read_description): New
+	function.
+	(aarch64_linux_init_abi): Register gdbarch_core_read_description.
+
 2017-08-09  Pedro Alves  <palves@redhat.com>
 
 	* cp-name-parser.y (cp_comp_to_string): Return a
diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index d2ca70a..c673151 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -231,6 +231,20 @@ aarch64_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
       NULL, cb_data);
 }
 
+/* Implement the "core_read_description" gdbarch method.  */
+
+static const struct target_desc *
+aarch64_linux_core_read_description (struct gdbarch *gdbarch,
+				     struct target_ops *target, bfd *abfd)
+{
+  CORE_ADDR aarch64_hwcap = 0;
+
+  if (target_auxv_search (target, AT_HWCAP, &aarch64_hwcap) != 1)
+    return NULL;
+
+  return tdesc_aarch64;
+}
+
 /* Implementation of `gdbarch_stap_is_single_operand', as defined in
    gdbarch.h.  */
 
@@ -1018,6 +1032,8 @@ aarch64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   set_gdbarch_iterate_over_regset_sections
     (gdbarch, aarch64_linux_iterate_over_regset_sections);
+  set_gdbarch_core_read_description
+    (gdbarch, aarch64_linux_core_read_description);
 
   /* SystemTap related.  */
   set_gdbarch_stap_integer_prefixes (gdbarch, stap_integer_prefixes);