gdbserver/linux-m32r-low.cc

   1 /* GNU/Linux/m32r specific low level interface, for the remote server for GDB.
   2    Copyright (C) 2005-2020 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "server.h"
  20 #include "linux-low.h"
  21
  22 #ifdef HAVE_SYS_REG_H
  23 #include <sys/reg.h>
  24 #endif
  25
  26 /* Defined in auto-generated file reg-m32r.c.  */
  27 void init_registers_m32r (void);
  28 extern const struct target_desc *tdesc_m32r;
  29
  30 #define m32r_num_regs 25
  31
  32 static int m32r_regmap[] = {
  33 #ifdef PT_R0
  34   PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  35   PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_FP, PT_LR, PT_SPU,
  36   PT_PSW, PT_CBR, PT_SPI, PT_SPU, PT_BPC, PT_PC, PT_ACCL, PT_ACCH, PT_EVB
  37 #else
  38   4 * 4, 4 * 5, 4 * 6, 4 * 7, 4 * 0, 4 * 1, 4 * 2, 4 * 8,
  39   4 * 9, 4 * 10, 4 * 11, 4 * 12, 4 * 13, 4 * 24, 4 * 25, 4 * 23,
  40   4 * 19, 4 * 31, 4 * 26, 4 * 23, 4 * 20, 4 * 30, 4 * 16, 4 * 15, 4 * 32
  41 #endif
  42 };
  43
  44 static int
  45 m32r_cannot_store_register (int regno)
  46 {
  47   return (regno >= m32r_num_regs);
  48 }
  49
  50 static int
  51 m32r_cannot_fetch_register (int regno)
  52 {
  53   return (regno >= m32r_num_regs);
  54 }
  55
  56 static const unsigned short m32r_breakpoint = 0x10f1;
  57 #define m32r_breakpoint_len 2
  58
  59 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
  60
  61 static const gdb_byte *
  62 m32r_sw_breakpoint_from_kind (int kind, int *size)
  63 {
  64   *size = m32r_breakpoint_len;
  65   return (const gdb_byte *) &m32r_breakpoint;
  66 }
  67
  68 static int
  69 m32r_breakpoint_at (CORE_ADDR where)
  70 {
  71   unsigned short insn;
  72
  73   the_target->pt->read_memory (where, (unsigned char *) &insn,
  74                                m32r_breakpoint_len);
  75   if (insn == m32r_breakpoint)
  76     return 1;
  77
  78   /* If necessary, recognize more trap instructions here.  GDB only uses the
  79      one.  */
  80   return 0;
  81 }
  82
  83 static void
  84 m32r_arch_setup (void)
  85 {
  86   current_process ()->tdesc = tdesc_m32r;
  87 }
  88
  89 /* Support for hardware single step.  */
  90
  91 static int
  92 m32r_supports_hardware_single_step (void)
  93 {
  94   return 1;
  95 }
  96
  97 static struct usrregs_info m32r_usrregs_info =
  98   {
  99     m32r_num_regs,
 100     m32r_regmap,
 101   };
 102
 103 static struct regs_info regs_info =
 104   {
 105     NULL, /* regset_bitmap */
 106     &m32r_usrregs_info,
 107   };
 108
 109 static const struct regs_info *
 110 m32r_regs_info (void)
 111 {
 112   return &regs_info;
 113 }
 114
 115 struct linux_target_ops the_low_target = {
 116   m32r_arch_setup,
 117   m32r_regs_info,
 118   m32r_cannot_fetch_register,
 119   m32r_cannot_store_register,
 120   NULL, /* fetch_register */
 121   linux_get_pc_32bit,
 122   linux_set_pc_32bit,
 123   NULL, /* breakpoint_from_pc */
 124   m32r_sw_breakpoint_from_kind,
 125   NULL,
 126   0,
 127   m32r_breakpoint_at,
 128   NULL, /* supports_z_point_type */
 129   NULL, /* insert_point */
 130   NULL, /* remove_point */
 131   NULL, /* stopped_by_watchpoint */
 132   NULL, /* stopped_data_address */
 133   NULL, /* collect_ptrace_register */
 134   NULL, /* supply_ptrace_register */
 135   NULL, /* siginfo_fixup */
 136   NULL, /* new_process */
 137   NULL, /* delete_process */
 138   NULL, /* new_thread */
 139   NULL, /* delete_thread */
 140   NULL, /* new_fork */
 141   NULL, /* prepare_to_resume */
 142   NULL, /* process_qsupported */
 143   NULL, /* supports_tracepoints */
 144   NULL, /* get_thread_area */
 145   NULL, /* install_fast_tracepoint_jump_pad */
 146   NULL, /* emit_ops */
 147   NULL, /* get_min_fast_tracepoint_insn_len */
 148   NULL, /* supports_range_stepping */
 149   NULL, /* breakpoint_kind_from_current_state */
 150   m32r_supports_hardware_single_step,
 151 };
 152
 153 void
 154 initialize_low_arch (void)
 155 {
 156   init_registers_m32r ();
 157 }