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