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, 2009 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-sh.c.  */
  24 void init_registers_sh (void);
  25
  26 #ifdef HAVE_SYS_REG_H
  27 #include <sys/reg.h>
  28 #endif
  29
  30 #include <asm/ptrace.h>
  31
  32 #define sh_num_regs 41
  33
  34 /* Currently, don't check/send MQ.  */
  35 static int sh_regmap[] = {
  36  0,     4,      8,      12,     16,     20,     24,     28,
  37  32,    36,     40,     44,     48,     52,     56,     60,
  38
  39  REG_PC*4,   REG_PR*4,   REG_GBR*4,  -1,
  40  REG_MACH*4, REG_MACL*4, REG_SR*4,
  41  REG_FPUL*4, REG_FPSCR*4,
  42
  43  REG_FPREG0*4+0,   REG_FPREG0*4+4,   REG_FPREG0*4+8,   REG_FPREG0*4+12,
  44  REG_FPREG0*4+16,  REG_FPREG0*4+20,  REG_FPREG0*4+24,  REG_FPREG0*4+28,
  45  REG_FPREG0*4+32,  REG_FPREG0*4+36,  REG_FPREG0*4+40,  REG_FPREG0*4+44,
  46  REG_FPREG0*4+48,  REG_FPREG0*4+52,  REG_FPREG0*4+56,  REG_FPREG0*4+60,
  47 };
  48
  49 static int
  50 sh_cannot_store_register (int regno)
  51 {
  52   return 0;
  53 }
  54
  55 static int
  56 sh_cannot_fetch_register (int regno)
  57 {
  58   return 0;
  59 }
  60
  61 static CORE_ADDR
  62 sh_get_pc ()
  63 {
  64   unsigned long pc;
  65   collect_register_by_name ("pc", &pc);
  66   return pc;
  67 }
  68
  69 static void
  70 sh_set_pc (CORE_ADDR pc)
  71 {
  72   unsigned long newpc = pc;
  73   supply_register_by_name ("pc", &newpc);
  74 }
  75
  76 /* Correct in either endianness, obviously.  */
  77 static const unsigned short sh_breakpoint = 0xc3c3;
  78 #define sh_breakpoint_len 2
  79
  80 static int
  81 sh_breakpoint_at (CORE_ADDR where)
  82 {
  83   unsigned short insn;
  84
  85   (*the_target->read_memory) (where, (unsigned char *) &insn, 2);
  86   if (insn == sh_breakpoint)
  87     return 1;
  88
  89   /* If necessary, recognize more trap instructions here.  GDB only uses the
  90      one.  */
  91   return 0;
  92 }
  93
  94 /* Provide only a fill function for the general register set.  ps_lgetregs
  95    will use this for NPTL support.  */
  96
  97 static void sh_fill_gregset (void *buf)
  98 {
  99   int i;
 100
 101   for (i = 0; i < 23; i++)
 102     if (sh_regmap[i] != -1)
 103       collect_register (i, (char *) buf + sh_regmap[i]);
 104 }
 105
 106 struct regset_info target_regsets[] = {
 107   { 0, 0, 0, GENERAL_REGS, sh_fill_gregset, NULL },
 108   { 0, 0, -1, -1, NULL, NULL }
 109 };
 110
 111 struct linux_target_ops the_low_target = {
 112   init_registers_sh,
 113   sh_num_regs,
 114   sh_regmap,
 115   sh_cannot_fetch_register,
 116   sh_cannot_store_register,
 117   sh_get_pc,
 118   sh_set_pc,
 119   (const unsigned char *) &sh_breakpoint,
 120   sh_breakpoint_len,
 121   NULL,
 122   0,
 123   sh_breakpoint_at,
 124 };