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/* Native-dependent code for GNU/Linux TILE-Gx.
Copyright (C) 2012-2020 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 "inferior.h"
#include "gdbcore.h"
#include "regcache.h"
#include "linux-nat.h"
#include "inf-ptrace.h"
#include "nat/gdb_ptrace.h"
#include <sys/procfs.h>
/* Defines ps_err_e, struct ps_prochandle. */
#include "gdb_proc_service.h"
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
class tilegx_linux_nat_target final : public linux_nat_target
{
public:
/* Add our register access methods. */
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
};
static tilegx_linux_nat_target the_tilegx_linux_nat_target;
/* The register sets used in GNU/Linux ELF core-dumps are identical to
the register sets in `struct user' that is used for a.out
core-dumps, and is also used by `ptrace'. The corresponding types
are `elf_gregset_t' for the general-purpose registers (with
`elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
for the floating-point registers.
Those types used to be available under the names `gregset_t' and
`fpregset_t' too, and this file used those names in the past. But
those names are now used for the register sets used in the
`mcontext_t' type, and have a different size and layout. */
/* Mapping between the general-purpose registers in `struct user'
format and GDB's register array layout. Note that we map the
first 56 registers (0 thru 55) one-to-one. GDB maps the pc to
slot 64, but ptrace returns it in slot 56. */
static const int regmap[] =
{
0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
-1, -1, -1, -1, -1, -1, -1, -1,
56, 58
};
/* Transfering the general-purpose registers between GDB, inferiors
and core files. */
/* Fill GDB's register array with the general-purpose register values
in *GREGSETP. */
void
supply_gregset (struct regcache* regcache,
const elf_gregset_t *gregsetp)
{
elf_greg_t *regp = (elf_greg_t *) gregsetp;
int i;
for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++)
if (regmap[i] >= 0)
regcache->raw_supply (i, regp + regmap[i]);
}
/* Fill registers in *GREGSETPS with the values in GDB's
register array. */
void
fill_gregset (const struct regcache* regcache,
elf_gregset_t *gregsetp, int regno)
{
elf_greg_t *regp = (elf_greg_t *) gregsetp;
int i;
for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++)
if (regmap[i] >= 0)
regcache->raw_collect (i, regp + regmap[i]);
}
/* Transfering floating-point registers between GDB, inferiors and cores. */
/* Fill GDB's register array with the floating-point register values in
*FPREGSETP. */
void
supply_fpregset (struct regcache *regcache,
const elf_fpregset_t *fpregsetp)
{
/* NOTE: There are no floating-point registers for TILE-Gx. */
}
/* Fill register REGNO (if it is a floating-point register) in
*FPREGSETP with the value in GDB's register array. If REGNO is -1,
do this for all registers. */
void
fill_fpregset (const struct regcache *regcache,
elf_fpregset_t *fpregsetp, int regno)
{
/* NOTE: There are no floating-point registers for TILE-Gx. */
}
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
for all registers. */
void
tilegx_linux_nat_target::fetch_registers (struct regcache *regcache,
int regnum)
{
elf_gregset_t regs;
pid_t tid = get_ptrace_pid (regcache->ptid ());
if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 0)
perror_with_name (_("Couldn't get registers"));
supply_gregset (regcache, (const elf_gregset_t *)®s);
}
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
this for all registers. */
void
tilegx_linux_nat_target::store_registers (struct regcache *regcache,
int regnum)
{
elf_gregset_t regs;
pid_t tid = get_ptrace_pid (regcache->ptid ());
if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 0)
perror_with_name (_("Couldn't get registers"));
fill_gregset (regcache, ®s, regnum);
if (ptrace (PTRACE_SETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 0)
perror_with_name (_("Couldn't write registers"));
}
void
_initialize_tile_linux_nat (void)
{
linux_target = &the_tilegx_linux_nat_target;
add_inf_child_target (&the_tilegx_linux_nat_target);
}
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