[GDBserver] Centralize tdesc for i386-linux

tdesc_i386_XXX_linux is used in many places in linux-x86-low.c and this
patch adds a new function i386_linux_read_description to return the right
tdesc according to xcr0.  i386_linux_read_description is quite similar to
the counterpart in GDB, and the following patch will share the duplicated
code, so this patch adds arch/tdesc.h includes the declarations of various
tdesc apis which are used by the shared code.  The generated c feature
files can include arch/tdesc.h only.

gdb/gdbserver:

2017-09-05  Yao Qi  <yao.qi@linaro.org>

	* configure.srv (srv_tgtobj): Append linux-x86-tdesc.o.
	(ipa_obj): Likewise.
	* linux-i386-ipa.c: Include common/x86-xstate.h
	(get_ipa_tdesc): Call i386_linux_read_description.
	(initialize_low_tracepoint): Don't call  init_registers_XXX
	functions, call initialize_low_tdesc instead.
	* linux-x86-low.c (x86_linux_read_description): Call
	i386_linux_read_description.
	(initialize_low_arch): Don't call init_registers_i386_XXX
	functions, call initialize_low_tdesc.
	* linux-x86-tdesc.c: New file.
	* linux-x86-tdesc.h (x86_linux_tdesc): New X86_TDESC_LAST.
	(i386_get_ipa_tdesc_idx): Declare.
	(i386_get_ipa_tdesc): Declare.
	(initialize_low_tdesc): Declare.

gdb:

2017-09-05  Yao Qi  <yao.qi@linaro.org>

	* arch/tdesc.h: New file.
	* regformats/regdat.sh: Generate code using tdesc_create_reg.
	* target-descriptions.c: Update comments.
	* target-descriptions.h: Include "arch/tdesc.h".  Remove the
	declarations.
	* features/i386/32bit-avx.c: Re-generated.
	* features/i386/32bit-avx512.c: Re-generated.
	* features/i386/32bit-core.c: Re-generated.
	* features/i386/32bit-linux.c: Re-generated.
	* features/i386/32bit-mpx.c: Re-generated.
	* features/i386/32bit-pkeys.c: Re-generated.
	* features/i386/32bit-sse.c: Re-generated.

1 files changed, 1 insertions, 35 deletions

diff --git a/gdb/target-descriptions.h b/gdb/target-descriptions.h
index 591da15..c4f9b92 100644
--- a/gdb/target-descriptions.h
+++ b/gdb/target-descriptions.h
@@ -21,14 +21,10 @@
 
 #ifndef TARGET_DESCRIPTIONS_H
 #define TARGET_DESCRIPTIONS_H 1
+#include "arch/tdesc.h"
 
-struct tdesc_feature;
 struct tdesc_arch_data;
-struct tdesc_type;
-struct tdesc_reg;
-struct target_desc;
 struct target_ops;
-struct target_desc;
 /* An inferior's target description info is stored in this opaque
    object.  There's one such object per inferior.  */
 struct target_desc_info;
@@ -182,12 +178,6 @@ const struct tdesc_feature *tdesc_find_feature (const struct target_desc *,
 
 const char *tdesc_feature_name (const struct tdesc_feature *feature);
 
-/* Return the type associated with ID in the context of FEATURE, or
-   NULL if none.  */
-
-struct tdesc_type *tdesc_named_type (const struct tdesc_feature *feature,
-				     const char *id);
-
 /* Return the name of register REGNO, from the target description or
    from an architecture-provided pseudo_register_name method.  */
 
@@ -220,38 +210,14 @@ void set_tdesc_property (struct target_desc *,
 			 const char *key, const char *value);
 void tdesc_add_compatible (struct target_desc *,
 			   const struct bfd_arch_info *);
-
-struct tdesc_feature *tdesc_create_feature (struct target_desc *tdesc,
-					    const char *name);
-struct tdesc_type *tdesc_create_vector (struct tdesc_feature *feature,
-					const char *name,
-					struct tdesc_type *field_type,
-					int count);
-struct tdesc_type *tdesc_create_struct (struct tdesc_feature *feature,
-					const char *name);
-void tdesc_set_struct_size (struct tdesc_type *type, int size);
-struct tdesc_type *tdesc_create_union (struct tdesc_feature *feature,
-				       const char *name);
-struct tdesc_type *tdesc_create_flags (struct tdesc_feature *feature,
-				       const char *name,
-				       int size);
 struct tdesc_type *tdesc_create_enum (struct tdesc_feature *feature,
 				      const char *name,
 				      int size);
-void tdesc_add_field (struct tdesc_type *type, const char *field_name,
-		      struct tdesc_type *field_type);
 void tdesc_add_typed_bitfield (struct tdesc_type *type, const char *field_name,
 			       int start, int end,
 			       struct tdesc_type *field_type);
-void tdesc_add_bitfield (struct tdesc_type *type, const char *field_name,
-			 int start, int end);
-void tdesc_add_flag (struct tdesc_type *type, int start,
-		     const char *flag_name);
 void tdesc_add_enum_value (struct tdesc_type *type, int value,
 			   const char *name);
-void tdesc_create_reg (struct tdesc_feature *feature, const char *name,
-		       int regnum, int save_restore, const char *group,
-		       int bitsize, const char *type);
 
 #if GDB_SELF_TEST
 namespace selftests {