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/* GNU/Linux/BFIN specific low level interface, for the remote server for GDB.
Copyright (C) 2005-2015 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>
/* 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)
static int
bfin_cannot_store_register (int regno)
{
return (regno >= bfin_num_regs);
}
static int
bfin_cannot_fetch_register (int regno)
{
return (regno >= bfin_num_regs);
}
static CORE_ADDR
bfin_get_pc (struct regcache *regcache)
{
unsigned long pc;
collect_register_by_name (regcache, "pc", &pc);
return pc;
}
static void
bfin_set_pc (struct regcache *regcache, CORE_ADDR pc)
{
unsigned long newpc = pc;
supply_register_by_name (regcache, "pc", &newpc);
}
#define bfin_breakpoint_len 2
static const unsigned char bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00};
static int
bfin_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 1;
/* If necessary, recognize more trap instructions here. GDB only uses the
one. */
return 0;
}
static void
bfin_arch_setup (void)
{
current_process ()->tdesc = tdesc_bfin;
}
static struct usrregs_info bfin_usrregs_info =
{
bfin_num_regs,
bfin_regmap,
};
static struct regs_info regs_info =
{
NULL, /* regset_bitmap */
&bfin_usrregs_info,
};
static const struct regs_info *
bfin_regs_info (void)
{
return ®s_info;
}
struct linux_target_ops the_low_target = {
bfin_arch_setup,
bfin_regs_info,
bfin_cannot_fetch_register,
bfin_cannot_store_register,
NULL, /* fetch_register */
bfin_get_pc,
bfin_set_pc,
bfin_breakpoint,
bfin_breakpoint_len,
NULL, /* breakpoint_reinsert_addr */
2,
bfin_breakpoint_at,
};
void
initialize_low_arch (void)
{
init_registers_bfin ();
}
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