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/* Ravenscar PowerPC target support.
Copyright (C) 2011-2022 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 "ppc-tdep.h"
#include "inferior.h"
#include "ravenscar-thread.h"
#include "ppc-ravenscar-thread.h"
#define NO_OFFSET -1
/* See ppc-tdep.h for register numbers. */
static const int powerpc_context_offsets[] =
{
/* R0 - R32 */
NO_OFFSET, 0, 4, NO_OFFSET,
NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET,
NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET,
NO_OFFSET, 8, 12, 16,
20, 24, 28, 32,
36, 40, 44, 48,
52, 56, 60, 64,
68, 72, 76, 80,
/* F0 - F31 */
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, 96, 104,
112, 120, 128, 136,
144, 152, 160, 168,
176, 184, 192, 200,
208, 216, 224, 232,
/* PC, MSR, CR, LR */
88, NO_OFFSET, 84, NO_OFFSET,
/* CTR, XER, FPSCR */
NO_OFFSET, NO_OFFSET, 240
};
static const int e500_context_offsets[] =
{
/* R0 - R32 */
NO_OFFSET, 4, 12, NO_OFFSET,
NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET,
NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET,
NO_OFFSET, 20, 28, 36,
44, 52, 60, 68,
76, 84, 92, 100,
108, 116, 124, 132,
140, 148, 156, 164,
/* F0 - F31 */
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, 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,
/* PC, MSR, CR, LR */
172, NO_OFFSET, 168, NO_OFFSET,
/* CTR, XER, FPSCR, MQ */
NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET,
/* Upper R0-R32. */
NO_OFFSET, 0, 8, NO_OFFSET,
NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET,
NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET,
NO_OFFSET, 16, 24, 32,
40, 48, 56, 64,
72, 80, 88, 96,
104, 112, 120, 128,
136, 144, 152, 160,
/* ACC, FSCR */
NO_OFFSET, 176
};
/* 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)
{
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
ppc_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_store_registers when inferior_ptid is different from the running
thread. */
static void
ppc_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 PowerPC targets. */
static const struct ravenscar_reg_info ppc_reg_info =
{
powerpc_context_offsets,
ARRAY_SIZE (powerpc_context_offsets),
};
struct ppc_ravenscar_powerpc_ops : public ravenscar_arch_ops
{
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
};
void
ppc_ravenscar_powerpc_ops::fetch_registers (struct regcache *regcache, int regnum)
{
ppc_ravenscar_generic_fetch_registers (&ppc_reg_info, regcache, regnum);
}
void
ppc_ravenscar_powerpc_ops::store_registers (struct regcache *regcache, int regnum)
{
ppc_ravenscar_generic_store_registers (&ppc_reg_info, regcache, regnum);
}
/* The ravenscar_arch_ops vector for most PowerPC targets. */
static struct ppc_ravenscar_powerpc_ops ppc_ravenscar_powerpc_ops;
/* Register ppc_ravenscar_powerpc_ops in GDBARCH. */
void
register_ppc_ravenscar_ops (struct gdbarch *gdbarch)
{
set_gdbarch_ravenscar_ops (gdbarch, &ppc_ravenscar_powerpc_ops);
}
/* The ravenscar_reg_info for E500 targets. */
static const struct ravenscar_reg_info e500_reg_info =
{
e500_context_offsets,
ARRAY_SIZE (e500_context_offsets),
};
struct ppc_ravenscar_e500_ops : public ravenscar_arch_ops
{
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
};
void
ppc_ravenscar_e500_ops::fetch_registers (struct regcache *regcache, int regnum)
{
ppc_ravenscar_generic_fetch_registers (&e500_reg_info, regcache, regnum);
}
/* Implement the to_store_registers ravenscar_arch_ops method
for E500 targets. */
void
ppc_ravenscar_e500_ops::store_registers (struct regcache *regcache, int regnum)
{
ppc_ravenscar_generic_store_registers (&e500_reg_info, regcache, regnum);
}
/* The ravenscar_arch_ops vector for E500 targets. */
static struct ppc_ravenscar_e500_ops ppc_ravenscar_e500_ops;
/* Register ppc_ravenscar_e500_ops in GDBARCH. */
void
register_e500_ravenscar_ops (struct gdbarch *gdbarch)
{
set_gdbarch_ravenscar_ops (gdbarch, &ppc_ravenscar_e500_ops);
}
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