gdb/gdbserver/linux-m32r-low.c

   1 /* GNU/Linux/m32r specific low level interface, for the remote server for GDB.
   2    Copyright (C) 2005, 2007 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 #define m32r_num_regs 25
  27
  28 static int m32r_regmap[] = {
  29 #ifdef PT_R0
  30   PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  31   PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_FP, PT_LR, PT_SPU,
  32   PT_PSW, PT_CBR, PT_SPI, PT_SPU, PT_BPC, PT_PC, PT_ACCL, PT_ACCH, PT_EVB
  33 #else
  34   4 * 4, 4 * 5, 4 * 6, 4 * 7, 4 * 0, 4 * 1, 4 * 2, 4 * 8,
  35   4 * 9, 4 * 10, 4 * 11, 4 * 12, 4 * 13, 4 * 24, 4 * 25, 4 * 23,
  36   4 * 19, 4 * 31, 4 * 26, 4 * 23, 4 * 20, 4 * 30, 4 * 16, 4 * 15, 4 * 32
  37 #endif
  38 };
  39
  40 static int
  41 m32r_cannot_store_register (int regno)
  42 {
  43   return (regno >= m32r_num_regs);
  44 }
  45
  46 static int
  47 m32r_cannot_fetch_register (int regno)
  48 {
  49   return (regno >= m32r_num_regs);
  50 }
  51
  52 static CORE_ADDR
  53 m32r_get_pc ()
  54 {
  55   unsigned long pc;
  56   collect_register_by_name ("pc", &pc);
  57   return pc;
  58 }
  59
  60 static void
  61 m32r_set_pc (CORE_ADDR pc)
  62 {
  63   unsigned long newpc = pc;
  64   supply_register_by_name ("pc", &newpc);
  65 }
  66
  67 static const unsigned short m32r_breakpoint = 0x10f1;
  68 #define m32r_breakpoint_len 2
  69
  70 static int
  71 m32r_breakpoint_at (CORE_ADDR where)
  72 {
  73   unsigned short insn;
  74
  75   (*the_target->read_memory) (where, (unsigned char *) &insn,
  76                               m32r_breakpoint_len);
  77   if (insn == m32r_breakpoint)
  78     return 1;
  79
  80   /* If necessary, recognize more trap instructions here.  GDB only uses the
  81      one.  */
  82   return 0;
  83 }
  84
  85 struct linux_target_ops the_low_target = {
  86   m32r_num_regs,
  87   m32r_regmap,
  88   m32r_cannot_fetch_register,
  89   m32r_cannot_store_register,
  90   m32r_get_pc,
  91   m32r_set_pc,
  92   (const unsigned char *) &m32r_breakpoint,
  93   m32r_breakpoint_len,
  94   NULL,
  95   0,
  96   m32r_breakpoint_at,
  97 };