gdb/gdbserver/linux-m32r-low.c

   1 /* GNU/Linux/m32r specific low level interface, for the remote server for GDB.
   2    Copyright (C) 2005-2015 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "server.h"
  20 #include "linux-low.h"
  21
  22 #ifdef HAVE_SYS_REG_H
  23 #include <sys/reg.h>
  24 #endif
  25
  26 /* Defined in auto-generated file reg-m32r.c.  */
  27 void init_registers_m32r (void);
  28 extern const struct target_desc *tdesc_m32r;
  29
  30 #define m32r_num_regs 25
  31
  32 static int m32r_regmap[] = {
  33 #ifdef PT_R0
  34   PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  35   PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_FP, PT_LR, PT_SPU,
  36   PT_PSW, PT_CBR, PT_SPI, PT_SPU, PT_BPC, PT_PC, PT_ACCL, PT_ACCH, PT_EVB
  37 #else
  38   4 * 4, 4 * 5, 4 * 6, 4 * 7, 4 * 0, 4 * 1, 4 * 2, 4 * 8,
  39   4 * 9, 4 * 10, 4 * 11, 4 * 12, 4 * 13, 4 * 24, 4 * 25, 4 * 23,
  40   4 * 19, 4 * 31, 4 * 26, 4 * 23, 4 * 20, 4 * 30, 4 * 16, 4 * 15, 4 * 32
  41 #endif
  42 };
  43
  44 static int
  45 m32r_cannot_store_register (int regno)
  46 {
  47   return (regno >= m32r_num_regs);
  48 }
  49
  50 static int
  51 m32r_cannot_fetch_register (int regno)
  52 {
  53   return (regno >= m32r_num_regs);
  54 }
  55
  56 static CORE_ADDR
  57 m32r_get_pc (struct regcache *regcache)
  58 {
  59   unsigned long pc;
  60   collect_register_by_name (regcache, "pc", &pc);
  61   if (debug_threads)
  62     debug_printf ("stop pc is %08lx\n", pc);
  63   return pc;
  64 }
  65
  66 static void
  67 m32r_set_pc (struct regcache *regcache, CORE_ADDR pc)
  68 {
  69   unsigned long newpc = pc;
  70   supply_register_by_name (regcache, "pc", &newpc);
  71 }
  72
  73 static const unsigned short m32r_breakpoint = 0x10f1;
  74 #define m32r_breakpoint_len 2
  75
  76 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
  77
  78 static const gdb_byte *
  79 m32r_sw_breakpoint_from_kind (int kind, int *size)
  80 {
  81   *size = m32r_breakpoint_len;
  82   return (const gdb_byte *) &m32r_breakpoint;
  83 }
  84
  85 static int
  86 m32r_breakpoint_at (CORE_ADDR where)
  87 {
  88   unsigned short insn;
  89
  90   (*the_target->read_memory) (where, (unsigned char *) &insn,
  91                               m32r_breakpoint_len);
  92   if (insn == m32r_breakpoint)
  93     return 1;
  94
  95   /* If necessary, recognize more trap instructions here.  GDB only uses the
  96      one.  */
  97   return 0;
  98 }
  99
 100 static void
 101 m32r_arch_setup (void)
 102 {
 103   current_process ()->tdesc = tdesc_m32r;
 104 }
 105
 106 static struct usrregs_info m32r_usrregs_info =
 107   {
 108     m32r_num_regs,
 109     m32r_regmap,
 110   };
 111
 112 static struct regs_info regs_info =
 113   {
 114     NULL, /* regset_bitmap */
 115     &m32r_usrregs_info,
 116   };
 117
 118 static const struct regs_info *
 119 m32r_regs_info (void)
 120 {
 121   return &regs_info;
 122 }
 123
 124 struct linux_target_ops the_low_target = {
 125   m32r_arch_setup,
 126   m32r_regs_info,
 127   m32r_cannot_fetch_register,
 128   m32r_cannot_store_register,
 129   NULL, /* fetch_register */
 130   m32r_get_pc,
 131   m32r_set_pc,
 132   NULL, /* breakpoint_from_pc */
 133   m32r_sw_breakpoint_from_kind,
 134   NULL,
 135   0,
 136   m32r_breakpoint_at,
 137 };
 138
 139 void
 140 initialize_low_arch (void)
 141 {
 142   init_registers_m32r ();
 143 }