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 #include "config.h"
  21 #include "qemu-common.h"
  22 #include "exec/gdbstub.h"
  23
  24 int crisv10_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
  25 {
  26     CRISCPU *cpu = CRIS_CPU(cs);
  27     CPUCRISState *env = &cpu->env;
  28
  29     if (n < 15) {
  30         return gdb_get_reg32(mem_buf, env->regs[n]);
  31     }
  32
  33     if (n == 15) {
  34         return gdb_get_reg32(mem_buf, env->pc);
  35     }
  36
  37     if (n < 32) {
  38         switch (n) {
  39         case 16:
  40             return gdb_get_reg8(mem_buf, env->pregs[n - 16]);
  41         case 17:
  42             return gdb_get_reg8(mem_buf, env->pregs[n - 16]);
  43         case 20:
  44         case 21:
  45             return gdb_get_reg16(mem_buf, env->pregs[n - 16]);
  46         default:
  47             if (n >= 23) {
  48                 return gdb_get_reg32(mem_buf, env->pregs[n - 16]);
  49             }
  50             break;
  51         }
  52     }
  53     return 0;
  54 }
  55
  56 int cris_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
  57 {
  58     CRISCPU *cpu = CRIS_CPU(cs);
  59     CPUCRISState *env = &cpu->env;
  60     uint8_t srs;
  61
  62     srs = env->pregs[PR_SRS];
  63     if (n < 16) {
  64         return gdb_get_reg32(mem_buf, env->regs[n]);
  65     }
  66
  67     if (n >= 21 && n < 32) {
  68         return gdb_get_reg32(mem_buf, env->pregs[n - 16]);
  69     }
  70     if (n >= 33 && n < 49) {
  71         return gdb_get_reg32(mem_buf, env->sregs[srs][n - 33]);
  72     }
  73     switch (n) {
  74     case 16:
  75         return gdb_get_reg8(mem_buf, env->pregs[0]);
  76     case 17:
  77         return gdb_get_reg8(mem_buf, env->pregs[1]);
  78     case 18:
  79         return gdb_get_reg32(mem_buf, env->pregs[2]);
  80     case 19:
  81         return gdb_get_reg8(mem_buf, srs);
  82     case 20:
  83         return gdb_get_reg16(mem_buf, env->pregs[4]);
  84     case 32:
  85         return gdb_get_reg32(mem_buf, env->pc);
  86     }
  87
  88     return 0;
  89 }
  90
  91 int cris_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
  92 {
  93     CRISCPU *cpu = CRIS_CPU(cs);
  94     CPUCRISState *env = &cpu->env;
  95     uint32_t tmp;
  96
  97     if (n > 49) {
  98         return 0;
  99     }
 100
 101     tmp = ldl_p(mem_buf);
 102
 103     if (n < 16) {
 104         env->regs[n] = tmp;
 105     }
 106
 107     if (n >= 21 && n < 32) {
 108         env->pregs[n - 16] = tmp;
 109     }
 110
 111     /* FIXME: Should support function regs be writable?  */
 112     switch (n) {
 113     case 16:
 114         return 1;
 115     case 17:
 116         return 1;
 117     case 18:
 118         env->pregs[PR_PID] = tmp;
 119         break;
 120     case 19:
 121         return 1;
 122     case 20:
 123         return 2;
 124     case 32:
 125         env->pc = tmp;
 126         break;
 127     }
 128
 129     return 4;
 130 }