gdb/gdbserver/linux-bfin-low.c

   1 /* GNU/Linux/BFIN specific low level interface, for the remote server for GDB.
   2
   3    Copyright (C) 2005-2014 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 extern const struct target_desc *tdesc_bfin;
  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 static void
  95 bfin_arch_setup (void)
  96 {
  97   current_process ()->tdesc = tdesc_bfin;
  98 }
  99
 100 static struct usrregs_info bfin_usrregs_info =
 101   {
 102     bfin_num_regs,
 103     bfin_regmap,
 104   };
 105
 106 static struct regs_info regs_info =
 107   {
 108     NULL, /* regset_bitmap */
 109     &bfin_usrregs_info,
 110   };
 111
 112 static const struct regs_info *
 113 bfin_regs_info (void)
 114 {
 115   return &regs_info;
 116 }
 117
 118 struct linux_target_ops the_low_target = {
 119   bfin_arch_setup,
 120   bfin_regs_info,
 121   bfin_cannot_fetch_register,
 122   bfin_cannot_store_register,
 123   NULL, /* fetch_register */
 124   bfin_get_pc,
 125   bfin_set_pc,
 126   bfin_breakpoint,
 127   bfin_breakpoint_len,
 128   NULL, /* breakpoint_reinsert_addr */
 129   2,
 130   bfin_breakpoint_at,
 131 };
 132
 133
 134 void
 135 initialize_low_arch (void)
 136 {
 137   init_registers_bfin ();
 138 }