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     unsigned i;
  30
  31     if (n < 0 || n >= env->config->gdb_regmap.num_regs) {
  32         return 0;
  33     }
  34
  35     switch (reg->type) {
  36     case 9: /*pc*/
  37         return gdb_get_reg32(mem_buf, env->pc);
  38
  39     case 1: /*ar*/
  40         xtensa_sync_phys_from_window(env);
  41         return gdb_get_reg32(mem_buf, env->phys_regs[(reg->targno & 0xff)
  42                                                      % env->config->nareg]);
  43
  44     case 2: /*SR*/
  45         return gdb_get_reg32(mem_buf, env->sregs[reg->targno & 0xff]);
  46
  47     case 3: /*UR*/
  48         return gdb_get_reg32(mem_buf, env->uregs[reg->targno & 0xff]);
  49
  50     case 4: /*f*/
  51         i = reg->targno & 0x0f;
  52         switch (reg->size) {
  53         case 4:
  54             return gdb_get_reg32(mem_buf,
  55                                  float32_val(env->fregs[i].f32[FP_F32_LOW]));
  56         case 8:
  57             return gdb_get_reg64(mem_buf, float64_val(env->fregs[i].f64));
  58         default:
  59             return 0;
  60         }
  61
  62     case 8: /*a*/
  63         return gdb_get_reg32(mem_buf, env->regs[reg->targno & 0x0f]);
  64
  65     default:
  66         qemu_log("%s from reg %d of unsupported type %d\n",
  67                  __func__, n, reg->type);
  68         return 0;
  69     }
  70 }
  71
  72 int xtensa_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
  73 {
  74     XtensaCPU *cpu = XTENSA_CPU(cs);
  75     CPUXtensaState *env = &cpu->env;
  76     uint32_t tmp;
  77     const XtensaGdbReg *reg = env->config->gdb_regmap.reg + n;
  78
  79     if (n < 0 || n >= env->config->gdb_regmap.num_regs) {
  80         return 0;
  81     }
  82
  83     tmp = ldl_p(mem_buf);
  84
  85     switch (reg->type) {
  86     case 9: /*pc*/
  87         env->pc = tmp;
  88         break;
  89
  90     case 1: /*ar*/
  91         env->phys_regs[(reg->targno & 0xff) % env->config->nareg] = tmp;
  92         xtensa_sync_window_from_phys(env);
  93         break;
  94
  95     case 2: /*SR*/
  96         env->sregs[reg->targno & 0xff] = tmp;
  97         break;
  98
  99     case 3: /*UR*/
 100         env->uregs[reg->targno & 0xff] = tmp;
 101         break;
 102
 103     case 4: /*f*/
 104         switch (reg->size) {
 105         case 4:
 106             env->fregs[reg->targno & 0x0f].f32[FP_F32_LOW] = make_float32(tmp);
 107             return 4;
 108         case 8:
 109             env->fregs[reg->targno & 0x0f].f64 = make_float64(tmp);
 110             return 8;
 111         default:
 112             return 0;
 113         }
 114
 115     case 8: /*a*/
 116         env->regs[reg->targno & 0x0f] = tmp;
 117         break;
 118
 119     default:
 120         qemu_log("%s to reg %d of unsupported type %d\n",
 121                  __func__, n, reg->type);
 122         return 0;
 123     }
 124
 125     return 4;
 126 }