target/tricore/gdbstub.c

   1 /*
   2  * TriCore gdb server stub
   3  *
   4  * Copyright (c) 2019 Bastian Koppelmann, Paderborn University
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "gdbstub/helpers.h"
  22
  23
  24 #define LCX_REGNUM         32
  25 #define FCX_REGNUM         33
  26 #define PCXI_REGNUM        34
  27 #define TRICORE_PSW_REGNUM 35
  28 #define TRICORE_PC_REGNUM  36
  29 #define ICR_REGNUM         37
  30 #define ISP_REGNUM         38
  31 #define BTV_REGNUM         39
  32 #define BIV_REGNUM         40
  33 #define SYSCON_REGNUM      41
  34 #define PMUCON0_REGNUM     42
  35 #define DMUCON_REGNUM      43
  36
  37 static uint32_t tricore_cpu_gdb_read_csfr(CPUTriCoreState *env, int n)
  38 {
  39     switch (n) {
  40     case LCX_REGNUM:
  41         return env->LCX;
  42     case FCX_REGNUM:
  43         return env->FCX;
  44     case PCXI_REGNUM:
  45         return env->PCXI;
  46     case TRICORE_PSW_REGNUM:
  47         return psw_read(env);
  48     case TRICORE_PC_REGNUM:
  49         return env->PC;
  50     case ICR_REGNUM:
  51         return env->ICR;
  52     case ISP_REGNUM:
  53         return env->ISP;
  54     case BTV_REGNUM:
  55         return env->BTV;
  56     case BIV_REGNUM:
  57         return env->BIV;
  58     case SYSCON_REGNUM:
  59         return env->SYSCON;
  60     case PMUCON0_REGNUM:
  61         return 0; /* PMUCON0 */
  62     case DMUCON_REGNUM:
  63         return 0; /* DMUCON0 */
  64     default:
  65         return 0;
  66     }
  67 }
  68
  69 static void tricore_cpu_gdb_write_csfr(CPUTriCoreState *env, int n,
  70                                        uint32_t val)
  71 {
  72     switch (n) {
  73     case LCX_REGNUM:
  74         env->LCX = val;
  75         break;
  76     case FCX_REGNUM:
  77         env->FCX = val;
  78         break;
  79     case PCXI_REGNUM:
  80         env->PCXI = val;
  81         break;
  82     case TRICORE_PSW_REGNUM:
  83         psw_write(env, val);
  84         break;
  85     case TRICORE_PC_REGNUM:
  86         env->PC = val;
  87         break;
  88     case ICR_REGNUM:
  89         env->ICR = val;
  90         break;
  91     case ISP_REGNUM:
  92         env->ISP = val;
  93         break;
  94     case BTV_REGNUM:
  95         env->BTV = val;
  96         break;
  97     case BIV_REGNUM:
  98         env->BIV = val;
  99         break;
 100     case SYSCON_REGNUM:
 101         env->SYSCON = val;
 102         break;
 103     }
 104 }
 105
 106
 107 int tricore_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
 108 {
 109     CPUTriCoreState *env = cpu_env(cs);
 110
 111     if (n < 16) { /* data registers */
 112         return gdb_get_reg32(mem_buf, env->gpr_d[n]);
 113     } else if (n < 32) { /* address registers */
 114         return gdb_get_reg32(mem_buf, env->gpr_a[n - 16]);
 115     } else { /* csfr */
 116         return gdb_get_reg32(mem_buf, tricore_cpu_gdb_read_csfr(env, n));
 117     }
 118     return 0;
 119 }
 120
 121 int tricore_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
 122 {
 123     CPUTriCoreState *env = cpu_env(cs);
 124     uint32_t tmp;
 125
 126     tmp = ldl_p(mem_buf);
 127
 128     if (n < 16) { /* data registers */
 129         env->gpr_d[n] = tmp;
 130     } else if (n < 32) { /* address registers */
 131         env->gpr_a[n - 16] = tmp;
 132     } else {
 133         tricore_cpu_gdb_write_csfr(env, n, tmp);
 134     }
 135     return 4;
 136 }