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 2 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, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19    Boston, MA 02110-1301, USA.  */
  20
  21 #include "server.h"
  22 #include "linux-low.h"
  23
  24 #ifdef HAVE_SYS_REG_H
  25 #include <sys/reg.h>
  26 #endif
  27
  28 #define m32r_num_regs 25
  29
  30 static int m32r_regmap[] = {
  31 #ifdef PT_R0
  32   PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  33   PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_FP, PT_LR, PT_SPU,
  34   PT_PSW, PT_CBR, PT_SPI, PT_SPU, PT_BPC, PT_PC, PT_ACCL, PT_ACCH, PT_EVB
  35 #else
  36   4 * 4, 4 * 5, 4 * 6, 4 * 7, 4 * 0, 4 * 1, 4 * 2, 4 * 8,
  37   4 * 9, 4 * 10, 4 * 11, 4 * 12, 4 * 13, 4 * 24, 4 * 25, 4 * 23,
  38   4 * 19, 4 * 31, 4 * 26, 4 * 23, 4 * 20, 4 * 30, 4 * 16, 4 * 15, 4 * 32
  39 #endif
  40 };
  41
  42 static int
  43 m32r_cannot_store_register (int regno)
  44 {
  45   return (regno >= m32r_num_regs);
  46 }
  47
  48 static int
  49 m32r_cannot_fetch_register (int regno)
  50 {
  51   return (regno >= m32r_num_regs);
  52 }
  53
  54 static CORE_ADDR
  55 m32r_get_pc ()
  56 {
  57   unsigned long pc;
  58   collect_register_by_name ("pc", &pc);
  59   return pc;
  60 }
  61
  62 static void
  63 m32r_set_pc (CORE_ADDR pc)
  64 {
  65   unsigned long newpc = pc;
  66   supply_register_by_name ("pc", &newpc);
  67 }
  68
  69 static const unsigned short m32r_breakpoint = 0x10f1;
  70 #define m32r_breakpoint_len 2
  71
  72 static int
  73 m32r_breakpoint_at (CORE_ADDR where)
  74 {
  75   unsigned short insn;
  76
  77   (*the_target->read_memory) (where, (unsigned char *) &insn,
  78                               m32r_breakpoint_len);
  79   if (insn == m32r_breakpoint)
  80     return 1;
  81
  82   /* If necessary, recognize more trap instructions here.  GDB only uses the
  83      one.  */
  84   return 0;
  85 }
  86
  87 struct linux_target_ops the_low_target = {
  88   m32r_num_regs,
  89   m32r_regmap,
  90   m32r_cannot_fetch_register,
  91   m32r_cannot_store_register,
  92   m32r_get_pc,
  93   m32r_set_pc,
  94   (const unsigned char *) &m32r_breakpoint,
  95   m32r_breakpoint_len,
  96   NULL,
  97   0,
  98   m32r_breakpoint_at,
  99 };