target-cris/gdbstub.c

   1 /*
   2  * CRIS gdb server stub
   3  *
   4  * Copyright (c) 2003-2005 Fabrice Bellard
   5  * Copyright (c) 2013 SUSE LINUX Products GmbH
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library 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 GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 static int
  22 read_register_crisv10(CPUCRISState *env, uint8_t *mem_buf, int n)
  23 {
  24     if (n < 15) {
  25         GET_REG32(env->regs[n]);
  26     }
  27
  28     if (n == 15) {
  29         GET_REG32(env->pc);
  30     }
  31
  32     if (n < 32) {
  33         switch (n) {
  34         case 16:
  35             GET_REG8(env->pregs[n - 16]);
  36         case 17:
  37             GET_REG8(env->pregs[n - 16]);
  38         case 20:
  39         case 21:
  40             GET_REG16(env->pregs[n - 16]);
  41         default:
  42             if (n >= 23) {
  43                 GET_REG32(env->pregs[n - 16]);
  44             }
  45             break;
  46         }
  47     }
  48     return 0;
  49 }
  50
  51 static int cpu_gdb_read_register(CPUCRISState *env, uint8_t *mem_buf, int n)
  52 {
  53     uint8_t srs;
  54
  55     if (env->pregs[PR_VR] < 32) {
  56         return read_register_crisv10(env, mem_buf, n);
  57     }
  58
  59     srs = env->pregs[PR_SRS];
  60     if (n < 16) {
  61         GET_REG32(env->regs[n]);
  62     }
  63
  64     if (n >= 21 && n < 32) {
  65         GET_REG32(env->pregs[n - 16]);
  66     }
  67     if (n >= 33 && n < 49) {
  68         GET_REG32(env->sregs[srs][n - 33]);
  69     }
  70     switch (n) {
  71     case 16:
  72         GET_REG8(env->pregs[0]);
  73     case 17:
  74         GET_REG8(env->pregs[1]);
  75     case 18:
  76         GET_REG32(env->pregs[2]);
  77     case 19:
  78         GET_REG8(srs);
  79     case 20:
  80         GET_REG16(env->pregs[4]);
  81     case 32:
  82         GET_REG32(env->pc);
  83     }
  84
  85     return 0;
  86 }
  87
  88 static int cpu_gdb_write_register(CPUCRISState *env, uint8_t *mem_buf, int n)
  89 {
  90     uint32_t tmp;
  91
  92     if (n > 49) {
  93         return 0;
  94     }
  95
  96     tmp = ldl_p(mem_buf);
  97
  98     if (n < 16) {
  99         env->regs[n] = tmp;
 100     }
 101
 102     if (n >= 21 && n < 32) {
 103         env->pregs[n - 16] = tmp;
 104     }
 105
 106     /* FIXME: Should support function regs be writable?  */
 107     switch (n) {
 108     case 16:
 109         return 1;
 110     case 17:
 111         return 1;
 112     case 18:
 113         env->pregs[PR_PID] = tmp;
 114         break;
 115     case 19:
 116         return 1;
 117     case 20:
 118         return 2;
 119     case 32:
 120         env->pc = tmp;
 121         break;
 122     }
 123
 124     return 4;
 125 }