gdb/gdbserver/linux-bfin-low.c

   1 /* GNU/Linux/BFIN specific low level interface, for the remote server for GDB.
   2
   3    Copyright (C) 2005-2015 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 <asm/ptrace.h>
  25
  26 /* Defined in auto-generated file reg-bfin.c.  */
  27 void init_registers_bfin (void);
  28 extern const struct target_desc *tdesc_bfin;
  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 gdb_byte bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00};
  77
  78 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
  79
  80 static const gdb_byte *
  81 bfin_sw_breakpoint_from_kind (int kind, int *size)
  82 {
  83   *size = bfin_breakpoint_len;
  84   return bfin_breakpoint;
  85 }
  86
  87 static int
  88 bfin_breakpoint_at (CORE_ADDR where)
  89 {
  90   unsigned char insn[bfin_breakpoint_len];
  91
  92   read_inferior_memory(where, insn, bfin_breakpoint_len);
  93   if (insn[0] == bfin_breakpoint[0]
  94       && insn[1] == bfin_breakpoint[1])
  95     return 1;
  96
  97   /* If necessary, recognize more trap instructions here.  GDB only uses the
  98      one.  */
  99   return 0;
 100 }
 101
 102 static void
 103 bfin_arch_setup (void)
 104 {
 105   current_process ()->tdesc = tdesc_bfin;
 106 }
 107
 108 static struct usrregs_info bfin_usrregs_info =
 109   {
 110     bfin_num_regs,
 111     bfin_regmap,
 112   };
 113
 114 static struct regs_info regs_info =
 115   {
 116     NULL, /* regset_bitmap */
 117     &bfin_usrregs_info,
 118   };
 119
 120 static const struct regs_info *
 121 bfin_regs_info (void)
 122 {
 123   return &regs_info;
 124 }
 125
 126 struct linux_target_ops the_low_target = {
 127   bfin_arch_setup,
 128   bfin_regs_info,
 129   bfin_cannot_fetch_register,
 130   bfin_cannot_store_register,
 131   NULL, /* fetch_register */
 132   bfin_get_pc,
 133   bfin_set_pc,
 134   NULL, /* breakpoint_kind_from_pc */
 135   bfin_sw_breakpoint_from_kind,
 136   NULL, /* breakpoint_reinsert_addr */
 137   2,
 138   bfin_breakpoint_at,
 139 };
 140
 141
 142 void
 143 initialize_low_arch (void)
 144 {
 145   init_registers_bfin ();
 146 }