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, 2007,
   3    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 #include <asm/ptrace.h>
  28
  29 #define sh_num_regs 41
  30
  31 /* Currently, don't check/send MQ.  */
  32 static int sh_regmap[] = {
  33  0,     4,      8,      12,     16,     20,     24,     28,
  34  32,    36,     40,     44,     48,     52,     56,     60,
  35
  36  REG_PC*4,   REG_PR*4,   REG_GBR*4,  -1,
  37  REG_MACH*4, REG_MACL*4, REG_SR*4,
  38  REG_FPUL*4, REG_FPSCR*4,
  39
  40  REG_FPREG0*4+0,   REG_FPREG0*4+4,   REG_FPREG0*4+8,   REG_FPREG0*4+12,
  41  REG_FPREG0*4+16,  REG_FPREG0*4+20,  REG_FPREG0*4+24,  REG_FPREG0*4+28,
  42  REG_FPREG0*4+32,  REG_FPREG0*4+36,  REG_FPREG0*4+40,  REG_FPREG0*4+44,
  43  REG_FPREG0*4+48,  REG_FPREG0*4+52,  REG_FPREG0*4+56,  REG_FPREG0*4+60,
  44 };
  45
  46 static int
  47 sh_cannot_store_register (int regno)
  48 {
  49   return 0;
  50 }
  51
  52 static int
  53 sh_cannot_fetch_register (int regno)
  54 {
  55   return 0;
  56 }
  57
  58 static CORE_ADDR
  59 sh_get_pc ()
  60 {
  61   unsigned long pc;
  62   collect_register_by_name ("pc", &pc);
  63   return pc;
  64 }
  65
  66 static void
  67 sh_set_pc (CORE_ADDR pc)
  68 {
  69   unsigned long newpc = pc;
  70   supply_register_by_name ("pc", &newpc);
  71 }
  72
  73 /* Correct in either endianness, obviously.  */
  74 static const unsigned short sh_breakpoint = 0xc3c3;
  75 #define sh_breakpoint_len 2
  76
  77 static int
  78 sh_breakpoint_at (CORE_ADDR where)
  79 {
  80   unsigned short insn;
  81
  82   (*the_target->read_memory) (where, (unsigned char *) &insn, 2);
  83   if (insn == sh_breakpoint)
  84     return 1;
  85
  86   /* If necessary, recognize more trap instructions here.  GDB only uses the
  87      one.  */
  88   return 0;
  89 }
  90
  91 /* Provide only a fill function for the general register set.  ps_lgetregs
  92    will use this for NPTL support.  */
  93
  94 static void sh_fill_gregset (void *buf)
  95 {
  96   int i;
  97
  98   for (i = 0; i < 23; i++)
  99     if (sh_regmap[i] != -1)
 100       collect_register (i, (char *) buf + sh_regmap[i]);
 101 }
 102
 103 struct regset_info target_regsets[] = {
 104   { 0, 0, 0, GENERAL_REGS, sh_fill_gregset, NULL },
 105   { 0, 0, -1, -1, NULL, NULL }
 106 };
 107
 108 struct linux_target_ops the_low_target = {
 109   sh_num_regs,
 110   sh_regmap,
 111   sh_cannot_fetch_register,
 112   sh_cannot_store_register,
 113   sh_get_pc,
 114   sh_set_pc,
 115   (const unsigned char *) &sh_breakpoint,
 116   sh_breakpoint_len,
 117   NULL,
 118   0,
 119   sh_breakpoint_at,
 120 };