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 "qemu/osdep.h"
  21 #include "qemu-common.h"
  22 #include "cpu.h"
  23 #include "exec/gdbstub.h"
  24 #include "qemu/log.h"
  25
  26 int xtensa_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
  27 {
  28     XtensaCPU *cpu = XTENSA_CPU(cs);
  29     CPUXtensaState *env = &cpu->env;
  30     const XtensaGdbReg *reg = env->config->gdb_regmap.reg + n;
  31     unsigned i;
  32
  33     if (n < 0 || n >= env->config->gdb_regmap.num_regs) {
  34         return 0;
  35     }
  36
  37     switch (reg->type) {
  38     case 9: /*pc*/
  39         return gdb_get_reg32(mem_buf, env->pc);
  40
  41     case 1: /*ar*/
  42         xtensa_sync_phys_from_window(env);
  43         return gdb_get_reg32(mem_buf, env->phys_regs[(reg->targno & 0xff)
  44                                                      % env->config->nareg]);
  45
  46     case 2: /*SR*/
  47         return gdb_get_reg32(mem_buf, env->sregs[reg->targno & 0xff]);
  48
  49     case 3: /*UR*/
  50         return gdb_get_reg32(mem_buf, env->uregs[reg->targno & 0xff]);
  51
  52     case 4: /*f*/
  53         i = reg->targno & 0x0f;
  54         switch (reg->size) {
  55         case 4:
  56             return gdb_get_reg32(mem_buf,
  57                                  float32_val(env->fregs[i].f32[FP_F32_LOW]));
  58         case 8:
  59             return gdb_get_reg64(mem_buf, float64_val(env->fregs[i].f64));
  60         default:
  61             return 0;
  62         }
  63
  64     case 8: /*a*/
  65         return gdb_get_reg32(mem_buf, env->regs[reg->targno & 0x0f]);
  66
  67     default:
  68         qemu_log_mask(LOG_UNIMP, "%s from reg %d of unsupported type %d\n",
  69                       __func__, n, reg->type);
  70         return 0;
  71     }
  72 }
  73
  74 int xtensa_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
  75 {
  76     XtensaCPU *cpu = XTENSA_CPU(cs);
  77     CPUXtensaState *env = &cpu->env;
  78     uint32_t tmp;
  79     const XtensaGdbReg *reg = env->config->gdb_regmap.reg + n;
  80
  81     if (n < 0 || n >= env->config->gdb_regmap.num_regs) {
  82         return 0;
  83     }
  84
  85     tmp = ldl_p(mem_buf);
  86
  87     switch (reg->type) {
  88     case 9: /*pc*/
  89         env->pc = tmp;
  90         break;
  91
  92     case 1: /*ar*/
  93         env->phys_regs[(reg->targno & 0xff) % env->config->nareg] = tmp;
  94         xtensa_sync_window_from_phys(env);
  95         break;
  96
  97     case 2: /*SR*/
  98         env->sregs[reg->targno & 0xff] = tmp;
  99         break;
 100
 101     case 3: /*UR*/
 102         env->uregs[reg->targno & 0xff] = tmp;
 103         break;
 104
 105     case 4: /*f*/
 106         switch (reg->size) {
 107         case 4:
 108             env->fregs[reg->targno & 0x0f].f32[FP_F32_LOW] = make_float32(tmp);
 109             return 4;
 110         case 8:
 111             env->fregs[reg->targno & 0x0f].f64 = make_float64(tmp);
 112             return 8;
 113         default:
 114             return 0;
 115         }
 116
 117     case 8: /*a*/
 118         env->regs[reg->targno & 0x0f] = tmp;
 119         break;
 120
 121     default:
 122         qemu_log_mask(LOG_UNIMP, "%s to reg %d of unsupported type %d\n",
 123                       __func__, n, reg->type);
 124         return 0;
 125     }
 126
 127     return 4;
 128 }