From ce6f16cdf46a266db68aa4610fa5a1bef6323f23 Mon Sep 17 00:00:00 2001
From: Joel Brobecker <brobecker@adacore.com>
Date: Fri, 7 Sep 2018 17:53:37 -0400
Subject: [PATCH] (Ada) Add ravenscar tasking support on AArch64
This patch adds support for debugging Ravenscar tasks, similar to what
is done for ppc and sparc.
gdb/ChangeLog:
* aarch64-ravenscar-thread.h, aarch64-ravenscar-thread.c:
New files.
* aarch64-tdep.c: #include "aarch64-ravenscar-thread.h".
(aarch64_gdbarch_init): Add call to register_aarch64_ravenscar_ops.
* Makefile.in (ALL_64_TARGET_OBS): Add aarch64-ravenscar-thread.o.
(HFILES_NO_SRCDIR): Add aarch64-ravenscar-thread.h.
(ALLDEPFILES): Add aarch64-ravenscar-thread.c.
* configure.tgt (cpu_obs) [aarch64*-*-*]: Add ravenscar-thread.o
and aarch64-ravenscar-thread.o.
* gdb/NEWS: Add entry documenting Ravenscar tasking support
on AArch64 ELF.
---
gdb/Makefile.in | 3 +
gdb/NEWS | 5 +
gdb/aarch64-ravenscar-thread.c | 213 +++++++++++++++++++++++++++++++++++++++++
gdb/aarch64-ravenscar-thread.h | 27 ++++++
gdb/aarch64-tdep.c | 3 +
gdb/configure.tgt | 3 +-
6 files changed, 253 insertions(+), 1 deletion(-)
create mode 100644 gdb/aarch64-ravenscar-thread.c
create mode 100644 gdb/aarch64-ravenscar-thread.h
@@ -627,6 +627,7 @@ ALL_64_TARGET_OBS = \
aarch64-fbsd-tdep.o \
aarch64-linux-tdep.o \
aarch64-newlib-tdep.o \
+ aarch64-ravenscar-thread.o \
aarch64-tdep.o \
alpha-bsd-tdep.o \
alpha-linux-tdep.o \
@@ -1165,6 +1166,7 @@ SFILES = \
# right, it is probably easiest just to list .h files here directly.
HFILES_NO_SRCDIR = \
+ aarch64-ravenscar-thread.h \
aarch64-tdep.h \
ada-lang.h \
addrmap.h \
@@ -2169,6 +2171,7 @@ ALLDEPFILES = \
aarch64-linux-nat.c \
aarch64-linux-tdep.c \
aarch64-newlib-tdep.c \
+ aarch64-ravenscar-thread.c \
aarch64-tdep.c \
aix-thread.c \
alpha-bsd-nat.c \
@@ -18,6 +18,11 @@
* DWARF index cache: GDB can now automatically save indices of DWARF
symbols on disk to speed up further loading of the same binaries.
+* Ada task switching is now supported on aarch64-elf targets when
+ debugging a program using the Ravenscar Profile. For more information,
+ see the "Tasking Support when using the Ravenscar Profile" section
+ in the GDB user manual.
+
* GDB in batch mode now exits with status 1 if the last command to be
executed failed.
new file mode 100644
@@ -0,0 +1,213 @@
+/* Ravenscar Aarch64 target support.
+
+ Copyright (C) 2017-2018 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 "defs.h"
+#include "gdbcore.h"
+#include "regcache.h"
+#include "aarch64-tdep.h"
+#include "inferior.h"
+#include "ravenscar-thread.h"
+#include "aarch64-ravenscar-thread.h"
+
+#define NO_OFFSET -1
+
+/* See aarch64-tdep.h for register numbers. */
+
+static const int aarch64_context_offsets[] =
+{
+ /* X0 - X28 */
+ NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET,
+ NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET,
+ NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET,
+ NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET,
+ NO_OFFSET, NO_OFFSET, NO_OFFSET, 0,
+ 8, 16, 24, 32,
+ 40, 48, 56, 64,
+ 72,
+
+ /* FP, LR, SP, PC, CPSR */
+ /* Note that as task switch is synchronous, PC is in fact the LR here */
+ 80, 88, 96, 88,
+ NO_OFFSET,
+
+ /* Q0 - Q31 */
+ 112, 128, 144, 160,
+ 176, 192, 208, 224,
+ 240, 256, 272, 288,
+ 304, 320, 336, 352,
+ 368, 384, 400, 416,
+ 432, 448, 464, 480,
+ 496, 512, 528, 544,
+ 560, 576, 592, 608,
+
+ /* FPSR, FPCR */
+ 104, 108,
+
+ /* FPU Saved field */
+ 624
+};
+
+/* The register layout info. */
+
+struct ravenscar_reg_info
+{
+ /* A table providing the offset relative to the context structure
+ where each register is saved. */
+ const int *context_offsets;
+
+ /* The number of elements in the context_offsets table above. */
+ int context_offsets_size;
+};
+
+/* supply register REGNUM, which has been saved on REGISTER_ADDR, to the
+ regcache. */
+
+static void
+supply_register_at_address (struct regcache *regcache, int regnum,
+ CORE_ADDR register_addr)
+{
+ struct gdbarch *gdbarch = regcache->arch ();
+ int buf_size = register_size (gdbarch, regnum);
+ gdb_byte *buf;
+
+ buf = (gdb_byte *) alloca (buf_size);
+ read_memory (register_addr, buf, buf_size);
+ regcache->raw_supply (regnum, buf);
+}
+
+/* Return true if, for a non-running thread, REGNUM has been saved on the
+ Thread_Descriptor. */
+
+static int
+register_in_thread_descriptor_p (const struct ravenscar_reg_info *reg_info,
+ int regnum)
+{
+ /* Check FPU registers */
+ return (regnum < reg_info->context_offsets_size
+ && reg_info->context_offsets[regnum] != NO_OFFSET);
+}
+
+/* to_fetch_registers when inferior_ptid is different from the running
+ thread. */
+
+static void
+aarch64_ravenscar_generic_fetch_registers
+ (const struct ravenscar_reg_info *reg_info,
+ struct regcache *regcache, int regnum)
+{
+ struct gdbarch *gdbarch = regcache->arch ();
+ const int num_regs = gdbarch_num_regs (gdbarch);
+ int current_regnum;
+ CORE_ADDR current_address;
+ CORE_ADDR thread_descriptor_address;
+
+ /* The tid is the thread_id field, which is a pointer to the thread. */
+ thread_descriptor_address = (CORE_ADDR) inferior_ptid.tid ();
+
+ /* Read registers. */
+ for (current_regnum = 0; current_regnum < num_regs; current_regnum++)
+ {
+ if (register_in_thread_descriptor_p (reg_info, current_regnum))
+ {
+ current_address = thread_descriptor_address
+ + reg_info->context_offsets[current_regnum];
+ supply_register_at_address (regcache, current_regnum,
+ current_address);
+ }
+ }
+}
+
+/* to_prepare_to_store when inferior_ptid is different from the running
+ thread. */
+
+static void
+aarch64_ravenscar_generic_prepare_to_store (struct regcache *regcache)
+{
+ /* Nothing to do. */
+}
+
+/* to_store_registers when inferior_ptid is different from the running
+ thread. */
+
+static void
+aarch64_ravenscar_generic_store_registers
+ (const struct ravenscar_reg_info *reg_info,
+ struct regcache *regcache, int regnum)
+{
+ struct gdbarch *gdbarch = regcache->arch ();
+ int buf_size = register_size (gdbarch, regnum);
+ gdb_byte buf[buf_size];
+ ULONGEST register_address;
+
+ if (register_in_thread_descriptor_p (reg_info, regnum))
+ register_address
+ = inferior_ptid.tid () + reg_info->context_offsets [regnum];
+ else
+ return;
+
+ regcache->raw_collect (regnum, buf);
+ write_memory (register_address,
+ buf,
+ buf_size);
+}
+
+/* The ravenscar_reg_info for most Aarch64 targets. */
+
+static const struct ravenscar_reg_info aarch64_reg_info =
+{
+ aarch64_context_offsets,
+ ARRAY_SIZE (aarch64_context_offsets),
+};
+
+/* Implement the to_fetch_registers ravenscar_arch_ops method
+ for most Aarch64 targets. */
+
+static void
+aarch64_ravenscar_fetch_registers (struct regcache *regcache, int regnum)
+{
+ aarch64_ravenscar_generic_fetch_registers
+ (&aarch64_reg_info, regcache, regnum);
+}
+
+/* Implement the to_store_registers ravenscar_arch_ops method
+ for most Aarch64 targets. */
+
+static void
+aarch64_ravenscar_store_registers (struct regcache *regcache, int regnum)
+{
+ aarch64_ravenscar_generic_store_registers
+ (&aarch64_reg_info, regcache, regnum);
+}
+
+/* The ravenscar_arch_ops vector for most Aarch64 targets. */
+
+static struct ravenscar_arch_ops aarch64_ravenscar_ops =
+{
+ aarch64_ravenscar_fetch_registers,
+ aarch64_ravenscar_store_registers,
+ aarch64_ravenscar_generic_prepare_to_store
+};
+
+/* Register aarch64_ravenscar_ops in GDBARCH. */
+
+void
+register_aarch64_ravenscar_ops (struct gdbarch *gdbarch)
+{
+ set_gdbarch_ravenscar_ops (gdbarch, &aarch64_ravenscar_ops);
+}
new file mode 100644
@@ -0,0 +1,27 @@
+/* Ravenscar Aarch64 target support.
+
+ Copyright (C) 2017-2018 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/>. */
+
+#ifndef AARCH64_RAVENSCAR_THREAD_H
+#define AARCH64_RAVENSCAR_THREAD_H
+
+struct gdbarch;
+
+extern void register_aarch64_ravenscar_ops (struct gdbarch *gdbarch);
+
+#endif
@@ -46,6 +46,7 @@
#include "selftest.h"
#include "aarch64-tdep.h"
+#include "aarch64-ravenscar-thread.h"
#include "elf-bfd.h"
#include "elf/aarch64.h"
@@ -3175,6 +3176,8 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
value_of_aarch64_user_reg,
&aarch64_register_aliases[i].regnum);
+ register_aarch64_ravenscar_ops (gdbarch);
+
return gdbarch;
}
@@ -48,7 +48,8 @@ amd64_tobjs="amd64-tdep.o arch/amd64.o ${x86_tobjs}"
case "${targ}" in
aarch64*-*-*)
- cpu_obs="aarch64-tdep.o arch/aarch64-insn.o arch/aarch64.o";;
+ cpu_obs="aarch64-tdep.o arch/aarch64-insn.o arch/aarch64.o \
+ ravenscar-thread.o aarch64-ravenscar-thread.o";;
alpha*-*-*)
# Target: Alpha
--
2.1.4