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 static int
  25 read_register_crisv10(CPUCRISState *env, uint8_t *mem_buf, int n)
  26 {
  27     if (n < 15) {
  28         return gdb_get_reg32(mem_buf, env->regs[n]);
  29     }
  30
  31     if (n == 15) {
  32         return gdb_get_reg32(mem_buf, env->pc);
  33     }
  34
  35     if (n < 32) {
  36         switch (n) {
  37         case 16:
  38             return gdb_get_reg8(mem_buf, env->pregs[n - 16]);
  39         case 17:
  40             return gdb_get_reg8(mem_buf, env->pregs[n - 16]);
  41         case 20:
  42         case 21:
  43             return gdb_get_reg16(mem_buf, env->pregs[n - 16]);
  44         default:
  45             if (n >= 23) {
  46                 return gdb_get_reg32(mem_buf, env->pregs[n - 16]);
  47             }
  48             break;
  49         }
  50     }
  51     return 0;
  52 }
  53
  54 int cris_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
  55 {
  56     CRISCPU *cpu = CRIS_CPU(cs);
  57     CPUCRISState *env = &cpu->env;
  58     uint8_t srs;
  59
  60     if (env->pregs[PR_VR] < 32) {
  61         return read_register_crisv10(env, mem_buf, n);
  62     }
  63
  64     srs = env->pregs[PR_SRS];
  65     if (n < 16) {
  66         return gdb_get_reg32(mem_buf, env->regs[n]);
  67     }
  68
  69     if (n >= 21 && n < 32) {
  70         return gdb_get_reg32(mem_buf, env->pregs[n - 16]);
  71     }
  72     if (n >= 33 && n < 49) {
  73         return gdb_get_reg32(mem_buf, env->sregs[srs][n - 33]);
  74     }
  75     switch (n) {
  76     case 16:
  77         return gdb_get_reg8(mem_buf, env->pregs[0]);
  78     case 17:
  79         return gdb_get_reg8(mem_buf, env->pregs[1]);
  80     case 18:
  81         return gdb_get_reg32(mem_buf, env->pregs[2]);
  82     case 19:
  83         return gdb_get_reg8(mem_buf, srs);
  84     case 20:
  85         return gdb_get_reg16(mem_buf, env->pregs[4]);
  86     case 32:
  87         return gdb_get_reg32(mem_buf, env->pc);
  88     }
  89
  90     return 0;
  91 }
  92
  93 int cris_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
  94 {
  95     CRISCPU *cpu = CRIS_CPU(cs);
  96     CPUCRISState *env = &cpu->env;
  97     uint32_t tmp;
  98
  99     if (n > 49) {
 100         return 0;
 101     }
 102
 103     tmp = ldl_p(mem_buf);
 104
 105     if (n < 16) {
 106         env->regs[n] = tmp;
 107     }
 108
 109     if (n >= 21 && n < 32) {
 110         env->pregs[n - 16] = tmp;
 111     }
 112
 113     /* FIXME: Should support function regs be writable?  */
 114     switch (n) {
 115     case 16:
 116         return 1;
 117     case 17:
 118         return 1;
 119     case 18:
 120         env->pregs[PR_PID] = tmp;
 121         break;
 122     case 19:
 123         return 1;
 124     case 20:
 125         return 2;
 126     case 32:
 127         env->pc = tmp;
 128         break;
 129     }
 130
 131     return 4;
 132 }