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/* GNU/Linux/TILE-Gx specific low level interface, GDBserver.
Copyright (C) 2012-2019 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"
/* 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
};
static int
tile_cannot_fetch_register (int regno)
{
if (regno >= 0 && regno < 56)
return 0;
else if (regno == 64)
return 0;
else
return 1;
}
static int
tile_cannot_store_register (int regno)
{
if (regno >= 0 && regno < 56)
return 0;
else if (regno == 64)
return 0;
else
return 1;
}
static uint64_t tile_breakpoint = 0x400b3cae70166000ULL;
#define tile_breakpoint_len 8
/* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
static const gdb_byte *
tile_sw_breakpoint_from_kind (int kind, int *size)
{
*size = tile_breakpoint_len;
return (const gdb_byte *) &tile_breakpoint;
}
static int
tile_breakpoint_at (CORE_ADDR where)
{
uint64_t insn;
(*the_target->read_memory) (where, (unsigned char *) &insn, 8);
if (insn == tile_breakpoint)
return 1;
/* If necessary, recognize more trap instructions here. GDB only uses the
one. */
return 0;
}
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 regs_info =
{
NULL, /* regset_bitmap */
&tile_usrregs_info,
&tile_regsets_info,
};
static const struct regs_info *
tile_regs_info (void)
{
return ®s_info;
}
static void
tile_arch_setup (void)
{
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;
}
/* Support for hardware single step. */
static int
tile_supports_hardware_single_step (void)
{
return 1;
}
struct linux_target_ops the_low_target =
{
tile_arch_setup,
tile_regs_info,
tile_cannot_fetch_register,
tile_cannot_store_register,
NULL,
linux_get_pc_64bit,
linux_set_pc_64bit,
NULL, /* breakpoint_kind_from_pc */
tile_sw_breakpoint_from_kind,
NULL,
0,
tile_breakpoint_at,
NULL, /* supports_z_point_type */
NULL, /* insert_point */
NULL, /* remove_point */
NULL, /* stopped_by_watchpoint */
NULL, /* stopped_data_address */
NULL, /* collect_ptrace_register */
NULL, /* supply_ptrace_register */
NULL, /* siginfo_fixup */
NULL, /* new_process */
NULL, /* delete_process */
NULL, /* new_thread */
NULL, /* delete_thread */
NULL, /* new_fork */
NULL, /* prepare_to_resume */
NULL, /* process_qsupported */
NULL, /* supports_tracepoints */
NULL, /* get_thread_area */
NULL, /* install_fast_tracepoint_jump_pad */
NULL, /* emit_ops */
NULL, /* get_min_fast_tracepoint_insn_len */
NULL, /* supports_range_stepping */
NULL, /* breakpoint_kind_from_current_state */
tile_supports_hardware_single_step,
};
void
initialize_low_arch (void)
{
init_registers_tilegx32();
init_registers_tilegx();
initialize_regsets_info (&tile_regsets_info);
}
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