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/* GNU/Linux/BFIN specific low level interface, for the remote server for GDB.
Copyright (C) 2005-2020 Free Software Foundation, Inc.
Contributed by Analog Devices, 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 <asm/ptrace.h>
/* Linux target op definitions for the BFIN architecture. */
class bfin_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;
int low_decr_pc_after_break () override;
bool low_breakpoint_at (CORE_ADDR pc) override;
};
/* The singleton target ops object. */
static bfin_target the_bfin_target;
bool
bfin_target::low_supports_breakpoints ()
{
return true;
}
CORE_ADDR
bfin_target::low_get_pc (regcache *regcache)
{
return linux_get_pc_32bit (regcache);
}
void
bfin_target::low_set_pc (regcache *regcache, CORE_ADDR pc)
{
linux_set_pc_32bit (regcache, pc);
}
int
bfin_target::low_decr_pc_after_break ()
{
return 2;
}
/* Defined in auto-generated file reg-bfin.c. */
void init_registers_bfin (void);
extern const struct target_desc *tdesc_bfin;
static int bfin_regmap[] =
{
PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
PT_P0, PT_P1, PT_P2, PT_P3, PT_P4, PT_P5, PT_USP, PT_FP,
PT_I0, PT_I1, PT_I2, PT_I3, PT_M0, PT_M1, PT_M2, PT_M3,
PT_B0, PT_B1, PT_B2, PT_B3, PT_L0, PT_L1, PT_L2, PT_L3,
PT_A0X, PT_A0W, PT_A1X, PT_A1W, PT_ASTAT, PT_RETS,
PT_LC0, PT_LT0, PT_LB0, PT_LC1, PT_LT1, PT_LB1,
-1 /* PT_CYCLES */, -1 /* PT_CYCLES2 */,
-1 /* PT_USP */, PT_SEQSTAT, PT_SYSCFG, PT_PC, PT_RETX, PT_RETN, PT_RETE,
PT_PC,
};
#define bfin_num_regs ARRAY_SIZE (bfin_regmap)
bool
bfin_target::low_cannot_store_register (int regno)
{
return (regno >= bfin_num_regs);
}
bool
bfin_target::low_cannot_fetch_register (int regno)
{
return (regno >= bfin_num_regs);
}
#define bfin_breakpoint_len 2
static const gdb_byte bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00};
/* Implementation of target ops method "sw_breakpoint_from_kind". */
const gdb_byte *
bfin_target::sw_breakpoint_from_kind (int kind, int *size)
{
*size = bfin_breakpoint_len;
return bfin_breakpoint;
}
bool
bfin_target::low_breakpoint_at (CORE_ADDR where)
{
unsigned char insn[bfin_breakpoint_len];
read_inferior_memory(where, insn, bfin_breakpoint_len);
if (insn[0] == bfin_breakpoint[0]
&& insn[1] == bfin_breakpoint[1])
return true;
/* If necessary, recognize more trap instructions here. GDB only uses the
one. */
return false;
}
void
bfin_target::low_arch_setup ()
{
current_process ()->tdesc = tdesc_bfin;
}
static struct usrregs_info bfin_usrregs_info =
{
bfin_num_regs,
bfin_regmap,
};
static struct regs_info myregs_info =
{
NULL, /* regset_bitmap */
&bfin_usrregs_info,
};
const regs_info *
bfin_target::get_regs_info ()
{
return &myregs_info;
}
/* The linux target ops object. */
linux_process_target *the_linux_target = &the_bfin_target;
void
initialize_low_arch (void)
{
init_registers_bfin ();
}
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