gnu/dist/gdb6/gdb/gdbserver/linux-sh-low.c

   1 /* GNU/Linux/SH specific low level interface, for the remote server for GDB.
   2    Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2005
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "server.h"
  23 #include "linux-low.h"
  24
  25 #ifdef HAVE_SYS_REG_H
  26 #include <sys/reg.h>
  27 #endif
  28
  29 #include <asm/ptrace.h>
  30
  31 #define sh_num_regs 41
  32
  33 /* Currently, don't check/send MQ.  */
  34 static int sh_regmap[] = {
  35  0,     4,      8,      12,     16,     20,     24,     28,
  36  32,    36,     40,     44,     48,     52,     56,     60,
  37
  38  REG_PC*4,   REG_PR*4,   REG_GBR*4,  -1,
  39  REG_MACH*4, REG_MACL*4, REG_SR*4,
  40  REG_FPUL*4, REG_FPSCR*4,
  41
  42  REG_FPREG0*4+0,   REG_FPREG0*4+4,   REG_FPREG0*4+8,   REG_FPREG0*4+12,
  43  REG_FPREG0*4+16,  REG_FPREG0*4+20,  REG_FPREG0*4+24,  REG_FPREG0*4+28,
  44  REG_FPREG0*4+32,  REG_FPREG0*4+36,  REG_FPREG0*4+40,  REG_FPREG0*4+44,
  45  REG_FPREG0*4+48,  REG_FPREG0*4+52,  REG_FPREG0*4+56,  REG_FPREG0*4+60,
  46 };
  47
  48 static int
  49 sh_cannot_store_register (int regno)
  50 {
  51   return 0;
  52 }
  53
  54 static int
  55 sh_cannot_fetch_register (int regno)
  56 {
  57   return 0;
  58 }
  59
  60 static CORE_ADDR
  61 sh_get_pc ()
  62 {
  63   unsigned long pc;
  64   collect_register_by_name ("pc", &pc);
  65   return pc;
  66 }
  67
  68 static void
  69 sh_set_pc (CORE_ADDR pc)
  70 {
  71   unsigned long newpc = pc;
  72   supply_register_by_name ("pc", &newpc);
  73 }
  74
  75 /* Correct in either endianness, obviously.  */
  76 static const unsigned short sh_breakpoint = 0xc3c3;
  77 #define sh_breakpoint_len 2
  78
  79 static int
  80 sh_breakpoint_at (CORE_ADDR where)
  81 {
  82   unsigned short insn;
  83
  84   (*the_target->read_memory) (where, (unsigned char *) &insn, 2);
  85   if (insn == sh_breakpoint)
  86     return 1;
  87
  88   /* If necessary, recognize more trap instructions here.  GDB only uses the
  89      one.  */
  90   return 0;
  91 }
  92
  93 struct linux_target_ops the_low_target = {
  94   sh_num_regs,
  95   sh_regmap,
  96   sh_cannot_fetch_register,
  97   sh_cannot_store_register,
  98   sh_get_pc,
  99   sh_set_pc,
 100   (const unsigned char *) &sh_breakpoint,
 101   sh_breakpoint_len,
 102   NULL,
 103   0,
 104   sh_breakpoint_at,
 105 };