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[PATCH 1/4] Add aarch64_create_target_description
- From: Alan Hayward <Alan dot Hayward at arm dot com>
- To: "gdb-patches at sourceware dot org" <gdb-patches at sourceware dot org>
- Cc: nd <nd at arm dot com>
- Date: Wed, 25 Oct 2017 08:28:47 +0000
- Subject: [PATCH 1/4] Add aarch64_create_target_description
- Authentication-results: sourceware.org; auth=none
- Authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alan dot Hayward at arm dot com;
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The first of a set of patches moving aarch64 over to use flexible
target descriptors.
For this patch, instead of accessing tdesc_aarch64 directly, obtain
it from the function aarch64_read_description.
For now, aarch64_create_target_description simply returns tdesc_aarch64.
This will be changes in the final patch.
This patch introduces no functionality changes.
Tested on a --enable-targets=all build and aarch64 build with board
files unix, native-gdbserver and unittest.exp.
Alan.
2017-10-25 Alan Hayward <alan.hayward@arm.com>
* Makefile.in: Add new files.
* aarch64-linux-nat.c (aarch64_linux_read_description): Call
aarch64_read_description.
* aarch64-linux-tdep.c (aarch64_linux_core_read_description):
Call aarch64_read_description.
* aarch64-tdep.c (aarch64_read_description): New function.
(aarch64_gdbarch_init): Call aarch64_read_description.
* aarch64-tdep.h (aarch64_read_description): New function.
* arch/aarch64.c: New file.
* configure.tgt: Add new files.
diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index e21ea55197fb2735762d540fba54de8c8b71bdf0..029e554306704c5a543b5c24b72908a95f4f85d3 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -779,6 +779,7 @@ ALL_64_TARGET_OBS = \
amd64-sol2-tdep.o \
amd64-tdep.o \
amd64-windows-tdep.o \
+ arch/aarch64.o \
arch/aarch64-insn.o \
arch/amd64.o \
ia64-linux-tdep.o \
@@ -1514,6 +1515,7 @@ HFILES_NO_SRCDIR = \
xml-syscall.h \
xml-tdesc.h \
xtensa-tdep.h \
+ arch/aarch64.h \
arch/aarch64-insn.h \
arch/arm.h \
arch/i386.h \
diff --git a/gdb/aarch64-linux-nat.c b/gdb/aarch64-linux-nat.c
index 4feaec39d910485d66cdb87a3615eee8a0c112e4..e571d926b462b7988f06bb65036a53b3ac68dd4f 100644
--- a/gdb/aarch64-linux-nat.c
+++ b/gdb/aarch64-linux-nat.c
@@ -501,7 +501,7 @@ aarch64_linux_read_description (struct target_ops *ops)
if (ret == 0)
return tdesc_arm_with_neon;
else
- return tdesc_aarch64;
+ return aarch64_read_description ();
}
/* Convert a native/host siginfo object, into/from the siginfo in the
diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index b6052bafd6d47e594b1452b565371f9bc1d84200..c2c2c309338a2ec814b615ac6c728bab7d5a4736 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -244,7 +244,7 @@ aarch64_linux_core_read_description (struct gdbarch *gdbarch,
if (target_auxv_search (target, AT_HWCAP, &aarch64_hwcap) != 1)
return NULL;
- return tdesc_aarch64;
+ return aarch64_read_description ();
}
/* Implementation of `gdbarch_stap_is_single_operand', as defined in
diff --git a/gdb/aarch64-tdep.h b/gdb/aarch64-tdep.h
index 2597443560f9caf9f7ce0d95cf3325a423b91e02..d9cbd353f3feaea12fb4a07cf4944f305326fc8f 100644
--- a/gdb/aarch64-tdep.h
+++ b/gdb/aarch64-tdep.h
@@ -75,7 +75,7 @@ struct gdbarch_tdep
int (*aarch64_syscall_record) (struct regcache *regcache, unsigned long svc_number);
};
-extern struct target_desc *tdesc_aarch64;
+const target_desc *aarch64_read_description ();
extern int aarch64_process_record (struct gdbarch *gdbarch,
struct regcache *regcache, CORE_ADDR addr);
diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index a40dc69b92dbacc06907c6a56f715d47632201a2..96d1391a193a43100e0fd4a262210ac7e90242dc 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -73,6 +73,9 @@
#define AARCH64_H0_REGNUM (AARCH64_S0_REGNUM + 32)
#define AARCH64_B0_REGNUM (AARCH64_H0_REGNUM + 32)
+/* The Aarch64 target descriptor. */
+static const struct target_desc *aarch64_tdesc = NULL;
+
/* The standard register names, and all the valid aliases for them. */
static const struct
{
@@ -2827,6 +2830,19 @@ aarch64_displaced_step_hw_singlestep (struct gdbarch *gdbarch,
return 1;
}
+/* Get the correct target description. */
+
+const target_desc *
+aarch64_read_description ()
+{
+ struct target_desc **tdesc = (struct target_desc **) &aarch64_tdesc;
+
+ if (*tdesc == NULL)
+ *tdesc = aarch64_create_target_description ();
+
+ return *tdesc;
+}
+
/* Initialize the current architecture based on INFO. If possible,
re-use an architecture from ARCHES, which is a list of
architectures already created during this debugging session.
@@ -2850,7 +2866,7 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
/* Ensure we always have a target descriptor. */
if (!tdesc_has_registers (tdesc))
- tdesc = tdesc_aarch64;
+ tdesc = aarch64_read_description ();
gdb_assert (tdesc);
diff --git a/gdb/arch/aarch64.h b/gdb/arch/aarch64.h
index b52740529b182bd63744022e552c3cdb3bc16759..ebb78c4fa80b4b659f85797dc0a0d84e83de4bba 100644
--- a/gdb/arch/aarch64.h
+++ b/gdb/arch/aarch64.h
@@ -20,6 +20,10 @@
#ifndef ARCH_AARCH64_H
#define ARCH_AARCH64_H
+#include "tdesc.h"
+
+target_desc *aarch64_create_target_description ();
+
/* Register numbers of various important registers. */
enum aarch64_regnum
{
diff --git a/gdb/arch/aarch64.c b/gdb/arch/aarch64.c
new file mode 100644
index 0000000000000000000000000000000000000000..95d9906f10e660fda99d73a0d2a9d184fd3a7b52
--- /dev/null
+++ b/gdb/arch/aarch64.c
@@ -0,0 +1,30 @@
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+
+#include "aarch64.h"
+
+extern struct target_desc *tdesc_aarch64;
+
+/* Create the aarch64 target description. */
+
+target_desc *
+aarch64_create_target_description ()
+{
+ return tdesc_aarch64;
+}
+
diff --git a/gdb/configure.tgt b/gdb/configure.tgt
index 1fce0798e24e162d7c456d7b881b298334ff0fbc..daec0a7bcd31944679b87fb4c3775dedc15dfd21 100644
--- a/gdb/configure.tgt
+++ b/gdb/configure.tgt
@@ -114,7 +114,7 @@ aarch64*-*-freebsd*)
aarch64*-*-linux*)
# Target: AArch64 linux
- gdb_target_obs="aarch64-linux-tdep.o \
+ gdb_target_obs="aarch64-linux-tdep.o arch/aarch64.o\
arch/arm.o arch/arm-linux.o arch/arm-get-next-pcs.o \
arm-tdep.o arm-linux-tdep.o \
glibc-tdep.o linux-tdep.o solib-svr4.o \