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/* 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);
}
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