target-xtensa/gdbstub.c

   1 /*
   2  * Xtensa 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 xtensa_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
  25 {
  26     XtensaCPU *cpu = XTENSA_CPU(cs);
  27     CPUXtensaState *env = &cpu->env;
  28     const XtensaGdbReg *reg = env->config->gdb_regmap.reg + n;
  29
  30     if (n < 0 || n >= env->config->gdb_regmap.num_regs) {
  31         return 0;
  32     }
  33
  34     switch (reg->type) {
  35     case 9: /*pc*/
  36         return gdb_get_reg32(mem_buf, env->pc);
  37
  38     case 1: /*ar*/
  39         xtensa_sync_phys_from_window(env);
  40         return gdb_get_reg32(mem_buf, env->phys_regs[(reg->targno & 0xff)
  41                                                      % env->config->nareg]);
  42
  43     case 2: /*SR*/
  44         return gdb_get_reg32(mem_buf, env->sregs[reg->targno & 0xff]);
  45
  46     case 3: /*UR*/
  47         return gdb_get_reg32(mem_buf, env->uregs[reg->targno & 0xff]);
  48
  49     case 4: /*f*/
  50         return gdb_get_reg32(mem_buf, float32_val(env->fregs[reg->targno
  51                                                              & 0x0f]));
  52
  53     case 8: /*a*/
  54         return gdb_get_reg32(mem_buf, env->regs[reg->targno & 0x0f]);
  55
  56     default:
  57         qemu_log("%s from reg %d of unsupported type %d\n",
  58                  __func__, n, reg->type);
  59         return 0;
  60     }
  61 }
  62
  63 int xtensa_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
  64 {
  65     XtensaCPU *cpu = XTENSA_CPU(cs);
  66     CPUXtensaState *env = &cpu->env;
  67     uint32_t tmp;
  68     const XtensaGdbReg *reg = env->config->gdb_regmap.reg + n;
  69
  70     if (n < 0 || n >= env->config->gdb_regmap.num_regs) {
  71         return 0;
  72     }
  73
  74     tmp = ldl_p(mem_buf);
  75
  76     switch (reg->type) {
  77     case 9: /*pc*/
  78         env->pc = tmp;
  79         break;
  80
  81     case 1: /*ar*/
  82         env->phys_regs[(reg->targno & 0xff) % env->config->nareg] = tmp;
  83         xtensa_sync_window_from_phys(env);
  84         break;
  85
  86     case 2: /*SR*/
  87         env->sregs[reg->targno & 0xff] = tmp;
  88         break;
  89
  90     case 3: /*UR*/
  91         env->uregs[reg->targno & 0xff] = tmp;
  92         break;
  93
  94     case 4: /*f*/
  95         env->fregs[reg->targno & 0x0f] = make_float32(tmp);
  96         break;
  97
  98     case 8: /*a*/
  99         env->regs[reg->targno & 0x0f] = tmp;
 100         break;
 101
 102     default:
 103         qemu_log("%s to reg %d of unsupported type %d\n",
 104                  __func__, n, reg->type);
 105         return 0;
 106     }
 107
 108     return 4;
 109 }