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, 2006, 2007, 2008, 2009, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6    Contributed by Analog Devices, Inc.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "server.h"
  24 #include "linux-low.h"
  25 #include "libiberty.h"
  26 #include <asm/ptrace.h>
  27
  28 /* Defined in auto-generated file reg-bfin.c.  */
  29 void init_registers_bfin (void);
  30
  31 static int bfin_regmap[] =
  32 {
  33   PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  34   PT_P0, PT_P1, PT_P2, PT_P3, PT_P4, PT_P5, PT_USP, PT_FP,
  35   PT_I0, PT_I1, PT_I2, PT_I3, PT_M0, PT_M1, PT_M2, PT_M3,
  36   PT_B0, PT_B1, PT_B2, PT_B3, PT_L0, PT_L1, PT_L2, PT_L3,
  37   PT_A0X, PT_A0W, PT_A1X, PT_A1W, PT_ASTAT, PT_RETS,
  38   PT_LC0, PT_LT0, PT_LB0, PT_LC1, PT_LT1, PT_LB1,
  39   -1 /* PT_CYCLES */, -1 /* PT_CYCLES2 */,
  40   -1 /* PT_USP */, PT_SEQSTAT, PT_SYSCFG, PT_PC, PT_RETX, PT_RETN, PT_RETE,
  41   PT_PC,
  42 };
  43
  44 #define bfin_num_regs ARRAY_SIZE (bfin_regmap)
  45
  46 static int
  47 bfin_cannot_store_register (int regno)
  48 {
  49   return (regno >= bfin_num_regs);
  50 }
  51
  52 static int
  53 bfin_cannot_fetch_register (int regno)
  54 {
  55   return (regno >= bfin_num_regs);
  56 }
  57
  58 static CORE_ADDR
  59 bfin_get_pc (struct regcache *regcache)
  60 {
  61   unsigned long pc;
  62
  63   collect_register_by_name (regcache, "pc", &pc);
  64
  65   return pc;
  66 }
  67
  68 static void
  69 bfin_set_pc (struct regcache *regcache, CORE_ADDR pc)
  70 {
  71   unsigned long newpc = pc;
  72
  73   supply_register_by_name (regcache, "pc", &newpc);
  74 }
  75
  76 #define bfin_breakpoint_len 2
  77 static const unsigned char bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00};
  78
  79 static int
  80 bfin_breakpoint_at (CORE_ADDR where)
  81 {
  82   unsigned char insn[bfin_breakpoint_len];
  83
  84   read_inferior_memory(where, insn, bfin_breakpoint_len);
  85   if (insn[0] == bfin_breakpoint[0]
  86       && insn[1] == bfin_breakpoint[1])
  87     return 1;
  88
  89   /* If necessary, recognize more trap instructions here.  GDB only uses the
  90      one.  */
  91   return 0;
  92 }
  93
  94 struct linux_target_ops the_low_target = {
  95   init_registers_bfin,
  96   bfin_num_regs,
  97   bfin_regmap,
  98   bfin_cannot_fetch_register,
  99   bfin_cannot_store_register,
 100   bfin_get_pc,
 101   bfin_set_pc,
 102   bfin_breakpoint,
 103   bfin_breakpoint_len,
 104   0,
 105   2,
 106   bfin_breakpoint_at,
 107 };