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             qemu_log_mask(LOG_UNIMP, "%s from reg %d of unsupported size %d\n",
  62                           __func__, n, reg->size);
  63             memset(mem_buf, 0, reg->size);
  64             return reg->size;
  65         }
  66
  67     case 8: /*a*/
  68         return gdb_get_reg32(mem_buf, env->regs[reg->targno & 0x0f]);
  69
  70     default:
  71         qemu_log_mask(LOG_UNIMP, "%s from reg %d of unsupported type %d\n",
  72                       __func__, n, reg->type);
  73         memset(mem_buf, 0, reg->size);
  74         return reg->size;
  75     }
  76 }
  77
  78 int xtensa_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
  79 {
  80     XtensaCPU *cpu = XTENSA_CPU(cs);
  81     CPUXtensaState *env = &cpu->env;
  82     uint32_t tmp;
  83     const XtensaGdbReg *reg = env->config->gdb_regmap.reg + n;
  84
  85     if (n < 0 || n >= env->config->gdb_regmap.num_regs) {
  86         return 0;
  87     }
  88
  89     tmp = ldl_p(mem_buf);
  90
  91     switch (reg->type) {
  92     case 9: /*pc*/
  93         env->pc = tmp;
  94         break;
  95
  96     case 1: /*ar*/
  97         env->phys_regs[(reg->targno & 0xff) % env->config->nareg] = tmp;
  98         xtensa_sync_window_from_phys(env);
  99         break;
 100
 101     case 2: /*SR*/
 102         env->sregs[reg->targno & 0xff] = tmp;
 103         break;
 104
 105     case 3: /*UR*/
 106         env->uregs[reg->targno & 0xff] = tmp;
 107         break;
 108
 109     case 4: /*f*/
 110         switch (reg->size) {
 111         case 4:
 112             env->fregs[reg->targno & 0x0f].f32[FP_F32_LOW] = make_float32(tmp);
 113             return 4;
 114         case 8:
 115             env->fregs[reg->targno & 0x0f].f64 = make_float64(tmp);
 116             return 8;
 117         default:
 118             qemu_log_mask(LOG_UNIMP, "%s to reg %d of unsupported size %d\n",
 119                           __func__, n, reg->size);
 120             return reg->size;
 121         }
 122
 123     case 8: /*a*/
 124         env->regs[reg->targno & 0x0f] = tmp;
 125         break;
 126
 127     default:
 128         qemu_log_mask(LOG_UNIMP, "%s to reg %d of unsupported type %d\n",
 129                       __func__, n, reg->type);
 130         return reg->size;
 131     }
 132
 133     return 4;
 134 }