gdb/gdbserver/linux-bfin-low.c

   1 /* GNU/Linux/BFIN specific low level interface, for the remote server for GDB.
   2
   3    Copyright (C) 2005-2013 Free Software Foundation, Inc.
   4
   5    Contributed by Analog Devices, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "server.h"
  23 #include "linux-low.h"
  24 #include "libiberty.h"
  25 #include <asm/ptrace.h>
  26
  27 /* Defined in auto-generated file reg-bfin.c.  */
  28 void init_registers_bfin (void);
  29
  30 static int bfin_regmap[] =
  31 {
  32   PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  33   PT_P0, PT_P1, PT_P2, PT_P3, PT_P4, PT_P5, PT_USP, PT_FP,
  34   PT_I0, PT_I1, PT_I2, PT_I3, PT_M0, PT_M1, PT_M2, PT_M3,
  35   PT_B0, PT_B1, PT_B2, PT_B3, PT_L0, PT_L1, PT_L2, PT_L3,
  36   PT_A0X, PT_A0W, PT_A1X, PT_A1W, PT_ASTAT, PT_RETS,
  37   PT_LC0, PT_LT0, PT_LB0, PT_LC1, PT_LT1, PT_LB1,
  38   -1 /* PT_CYCLES */, -1 /* PT_CYCLES2 */,
  39   -1 /* PT_USP */, PT_SEQSTAT, PT_SYSCFG, PT_PC, PT_RETX, PT_RETN, PT_RETE,
  40   PT_PC,
  41 };
  42
  43 #define bfin_num_regs ARRAY_SIZE (bfin_regmap)
  44
  45 static int
  46 bfin_cannot_store_register (int regno)
  47 {
  48   return (regno >= bfin_num_regs);
  49 }
  50
  51 static int
  52 bfin_cannot_fetch_register (int regno)
  53 {
  54   return (regno >= bfin_num_regs);
  55 }
  56
  57 static CORE_ADDR
  58 bfin_get_pc (struct regcache *regcache)
  59 {
  60   unsigned long pc;
  61
  62   collect_register_by_name (regcache, "pc", &pc);
  63
  64   return pc;
  65 }
  66
  67 static void
  68 bfin_set_pc (struct regcache *regcache, CORE_ADDR pc)
  69 {
  70   unsigned long newpc = pc;
  71
  72   supply_register_by_name (regcache, "pc", &newpc);
  73 }
  74
  75 #define bfin_breakpoint_len 2
  76 static const unsigned char bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00};
  77
  78 static int
  79 bfin_breakpoint_at (CORE_ADDR where)
  80 {
  81   unsigned char insn[bfin_breakpoint_len];
  82
  83   read_inferior_memory(where, insn, bfin_breakpoint_len);
  84   if (insn[0] == bfin_breakpoint[0]
  85       && insn[1] == bfin_breakpoint[1])
  86     return 1;
  87
  88   /* If necessary, recognize more trap instructions here.  GDB only uses the
  89      one.  */
  90   return 0;
  91 }
  92
  93 struct linux_target_ops the_low_target = {
  94   init_registers_bfin,
  95   bfin_num_regs,
  96   bfin_regmap,
  97   NULL,
  98   bfin_cannot_fetch_register,
  99   bfin_cannot_store_register,
 100   NULL, /* fetch_register */
 101   bfin_get_pc,
 102   bfin_set_pc,
 103   bfin_breakpoint,
 104   bfin_breakpoint_len,
 105   NULL, /* breakpoint_reinsert_addr */
 106   2,
 107   bfin_breakpoint_at,
 108 };