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/* GNU/Linux/TILE-Gx specific low level interface, GDBserver.
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 "server.h"
#include "linux-low.h"
#include <arch/abi.h>
#include "nat/gdb_ptrace.h"
/* Linux target op definitions for the TILE-Gx architecture. */
class tile_target : public linux_process_target
{
public:
const regs_info *get_regs_info () override;
const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
protected:
void low_arch_setup () override;
bool low_cannot_fetch_register (int regno) override;
bool low_cannot_store_register (int regno) override;
bool low_supports_breakpoints () override;
CORE_ADDR low_get_pc (regcache *regcache) override;
void low_set_pc (regcache *regcache, CORE_ADDR newpc) override;
bool low_breakpoint_at (CORE_ADDR pc) override;
};
/* The singleton target ops object. */
static tile_target the_tile_target;
bool
tile_target::low_supports_breakpoints ()
{
return true;
}
CORE_ADDR
tile_target::low_get_pc (regcache *regcache)
{
return linux_get_pc_64bit (regcache);
}
void
tile_target::low_set_pc (regcache *regcache, CORE_ADDR pc)
{
linux_set_pc_64bit (regcache, pc);
}
/* Defined in auto-generated file reg-tilegx.c. */
void init_registers_tilegx (void);
extern const struct target_desc *tdesc_tilegx;
/* Defined in auto-generated file reg-tilegx32.c. */
void init_registers_tilegx32 (void);
extern const struct target_desc *tdesc_tilegx32;
#define tile_num_regs 65
static int tile_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
};
bool
tile_target::low_cannot_fetch_register (int regno)
{
if (regno >= 0 && regno < 56)
return false;
else if (regno == 64)
return false;
else
return true;
}
bool
tile_target::low_cannot_store_register (int regno)
{
if (regno >= 0 && regno < 56)
return false;
else if (regno == 64)
return false;
else
return true;
}
static uint64_t tile_breakpoint = 0x400b3cae70166000ULL;
#define tile_breakpoint_len 8
/* Implementation of target ops method "sw_breakpoint_from_kind". */
const gdb_byte *
tile_target::sw_breakpoint_from_kind (int kind, int *size)
{
*size = tile_breakpoint_len;
return (const gdb_byte *) &tile_breakpoint;
}
bool
tile_target::low_breakpoint_at (CORE_ADDR where)
{
uint64_t insn;
read_memory (where, (unsigned char *) &insn, 8);
if (insn == tile_breakpoint)
return true;
/* If necessary, recognize more trap instructions here. GDB only uses the
one. */
return false;
}
static void
tile_fill_gregset (struct regcache *regcache, void *buf)
{
int i;
for (i = 0; i < tile_num_regs; i++)
if (tile_regmap[i] != -1)
collect_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
}
static void
tile_store_gregset (struct regcache *regcache, const void *buf)
{
int i;
for (i = 0; i < tile_num_regs; i++)
if (tile_regmap[i] != -1)
supply_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
}
static struct regset_info tile_regsets[] =
{
{ PTRACE_GETREGS, PTRACE_SETREGS, 0, tile_num_regs * 8,
GENERAL_REGS, tile_fill_gregset, tile_store_gregset },
NULL_REGSET
};
static struct regsets_info tile_regsets_info =
{
tile_regsets, /* regsets */
0, /* num_regsets */
NULL, /* disabled_regsets */
};
static struct usrregs_info tile_usrregs_info =
{
tile_num_regs,
tile_regmap,
};
static struct regs_info myregs_info =
{
NULL, /* regset_bitmap */
&tile_usrregs_info,
&tile_regsets_info,
};
const regs_info *
tile_target::get_regs_info ()
{
return &myregs_info;
}
void
tile_target::low_arch_setup ()
{
int pid = pid_of (current_thread);
unsigned int machine;
int is_elf64 = linux_pid_exe_is_elf_64_file (pid, &machine);
if (sizeof (void *) == 4)
if (is_elf64 > 0)
error (_("Can't debug 64-bit process with 32-bit GDBserver"));
if (!is_elf64)
current_process ()->tdesc = tdesc_tilegx32;
else
current_process ()->tdesc = tdesc_tilegx;
}
/* The linux target ops object. */
linux_process_target *the_linux_target = &the_tile_target;
void
initialize_low_arch (void)
{
init_registers_tilegx32();
init_registers_tilegx();
initialize_regsets_info (&tile_regsets_info);
}
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