gdb/gdbserver/linux-m68k-low.c

   1 /* GNU/Linux/m68k specific low level interface, for the remote server for GDB.
   2    Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   3    2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "server.h"
  21 #include "linux-low.h"
  22
  23 /* Defined in auto-generated file reg-m68k.c.  */
  24 void init_registers_m68k (void);
  25
  26 #ifdef HAVE_SYS_REG_H
  27 #include <sys/reg.h>
  28 #endif
  29
  30 #define m68k_num_regs 29
  31 #define m68k_num_gregs 18
  32
  33 /* This table must line up with REGISTER_NAMES in tm-m68k.h */
  34 static int m68k_regmap[] =
  35 {
  36 #ifdef PT_D0
  37   PT_D0 * 4, PT_D1 * 4, PT_D2 * 4, PT_D3 * 4,
  38   PT_D4 * 4, PT_D5 * 4, PT_D6 * 4, PT_D7 * 4,
  39   PT_A0 * 4, PT_A1 * 4, PT_A2 * 4, PT_A3 * 4,
  40   PT_A4 * 4, PT_A5 * 4, PT_A6 * 4, PT_USP * 4,
  41   PT_SR * 4, PT_PC * 4,
  42 #else
  43   14 * 4, 0 * 4, 1 * 4, 2 * 4, 3 * 4, 4 * 4, 5 * 4, 6 * 4,
  44   7 * 4, 8 * 4, 9 * 4, 10 * 4, 11 * 4, 12 * 4, 13 * 4, 15 * 4,
  45   17 * 4, 18 * 4,
  46 #endif
  47 #ifdef PT_FP0
  48   PT_FP0 * 4, PT_FP1 * 4, PT_FP2 * 4, PT_FP3 * 4,
  49   PT_FP4 * 4, PT_FP5 * 4, PT_FP6 * 4, PT_FP7 * 4,
  50   PT_FPCR * 4, PT_FPSR * 4, PT_FPIAR * 4
  51 #else
  52   21 * 4, 24 * 4, 27 * 4, 30 * 4, 33 * 4, 36 * 4,
  53   39 * 4, 42 * 4, 45 * 4, 46 * 4, 47 * 4
  54 #endif
  55 };
  56
  57 static int
  58 m68k_cannot_store_register (int regno)
  59 {
  60   return (regno >= m68k_num_regs);
  61 }
  62
  63 static int
  64 m68k_cannot_fetch_register (int regno)
  65 {
  66   return (regno >= m68k_num_regs);
  67 }
  68
  69 #ifdef HAVE_PTRACE_GETREGS
  70 #include <sys/procfs.h>
  71 #include <sys/ptrace.h>
  72
  73 static void
  74 m68k_fill_gregset (void *buf)
  75 {
  76   int i;
  77
  78   for (i = 0; i < m68k_num_gregs; i++)
  79     collect_register (i, (char *) buf + m68k_regmap[i]);
  80 }
  81
  82 static void
  83 m68k_store_gregset (const void *buf)
  84 {
  85   int i;
  86
  87   for (i = 0; i < m68k_num_gregs; i++)
  88     supply_register (i, (const char *) buf + m68k_regmap[i]);
  89 }
  90
  91 static void
  92 m68k_fill_fpregset (void *buf)
  93 {
  94   int i;
  95
  96   for (i = m68k_num_gregs; i < m68k_num_regs; i++)
  97     collect_register (i, ((char *) buf
  98                           + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs])));
  99 }
 100
 101 static void
 102 m68k_store_fpregset (const void *buf)
 103 {
 104   int i;
 105
 106   for (i = m68k_num_gregs; i < m68k_num_regs; i++)
 107     supply_register (i, ((const char *) buf
 108                          + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs])));
 109 }
 110
 111 #endif /* HAVE_PTRACE_GETREGS */
 112
 113 struct regset_info target_regsets[] = {
 114 #ifdef HAVE_PTRACE_GETREGS
 115   { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
 116     GENERAL_REGS,
 117     m68k_fill_gregset, m68k_store_gregset },
 118   { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t),
 119     FP_REGS,
 120     m68k_fill_fpregset, m68k_store_fpregset },
 121 #endif /* HAVE_PTRACE_GETREGS */
 122   { 0, 0, -1, -1, NULL, NULL }
 123 };
 124
 125 static const unsigned char m68k_breakpoint[] = { 0x4E, 0x4F };
 126 #define m68k_breakpoint_len 2
 127
 128 static CORE_ADDR
 129 m68k_get_pc ()
 130 {
 131   unsigned long pc;
 132
 133   collect_register_by_name ("pc", &pc);
 134   return pc;
 135 }
 136
 137 static void
 138 m68k_set_pc (CORE_ADDR value)
 139 {
 140   unsigned long newpc = value;
 141
 142   supply_register_by_name ("pc", &newpc);
 143 }
 144
 145 static int
 146 m68k_breakpoint_at (CORE_ADDR pc)
 147 {
 148   unsigned char c[2];
 149
 150   read_inferior_memory (pc, c, 2);
 151   if (c[0] == 0x4E && c[1] == 0x4F)
 152     return 1;
 153
 154   return 0;
 155 }
 156
 157 struct linux_target_ops the_low_target = {
 158   init_registers_m68k,
 159   m68k_num_regs,
 160   m68k_regmap,
 161   m68k_cannot_fetch_register,
 162   m68k_cannot_store_register,
 163   m68k_get_pc,
 164   m68k_set_pc,
 165   m68k_breakpoint,
 166   m68k_breakpoint_len,
 167   NULL,
 168   2,
 169   m68k_breakpoint_at,
 170 };