target/microblaze/gdbstub.c

   1 /*
   2  * MicroBlaze 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 2.1 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 "cpu.h"
  22 #include "exec/gdbstub.h"
  23
  24 /*
  25  * GDB expects SREGs in the following order:
  26  * PC, MSR, EAR, ESR, FSR, BTR, EDR, PID, ZPR, TLBX, TLBSX, TLBLO, TLBHI.
  27  *
  28  * PID, ZPR, TLBx, TLBsx, TLBLO, and TLBHI aren't modeled, so we don't
  29  * map them to anything and return a value of 0 instead.
  30  */
  31
  32 enum {
  33     GDB_PC    = 32 + 0,
  34     GDB_MSR   = 32 + 1,
  35     GDB_EAR   = 32 + 2,
  36     GDB_ESR   = 32 + 3,
  37     GDB_FSR   = 32 + 4,
  38     GDB_BTR   = 32 + 5,
  39     GDB_PVR0  = 32 + 6,
  40     GDB_PVR11 = 32 + 17,
  41     GDB_EDR   = 32 + 18,
  42     GDB_SLR   = 32 + 25,
  43     GDB_SHR   = 32 + 26,
  44 };
  45
  46 int mb_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
  47 {
  48     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
  49     CPUClass *cc = CPU_GET_CLASS(cs);
  50     CPUMBState *env = &cpu->env;
  51     uint32_t val;
  52
  53     if (n > cc->gdb_num_core_regs) {
  54         return 0;
  55     }
  56
  57     switch (n) {
  58     case 1 ... 31:
  59         val = env->regs[n];
  60         break;
  61     case GDB_PC:
  62         val = env->pc;
  63         break;
  64     case GDB_MSR:
  65         val = mb_cpu_read_msr(env);
  66         break;
  67     case GDB_EAR:
  68         val = env->ear;
  69         break;
  70     case GDB_ESR:
  71         val = env->esr;
  72         break;
  73     case GDB_FSR:
  74         val = env->fsr;
  75         break;
  76     case GDB_BTR:
  77         val = env->btr;
  78         break;
  79     case GDB_PVR0 ... GDB_PVR11:
  80         /* PVR12 is intentionally skipped */
  81         val = cpu->cfg.pvr_regs[n - GDB_PVR0];
  82         break;
  83     case GDB_EDR:
  84         val = env->edr;
  85         break;
  86     case GDB_SLR:
  87         val = env->slr;
  88         break;
  89     case GDB_SHR:
  90         val = env->shr;
  91         break;
  92     default:
  93         /* Other SRegs aren't modeled, so report a value of 0 */
  94         val = 0;
  95         break;
  96     }
  97     return gdb_get_reg32(mem_buf, val);
  98 }
  99
 100 int mb_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
 101 {
 102     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
 103     CPUClass *cc = CPU_GET_CLASS(cs);
 104     CPUMBState *env = &cpu->env;
 105     uint32_t tmp;
 106
 107     if (n > cc->gdb_num_core_regs) {
 108         return 0;
 109     }
 110
 111     tmp = ldl_p(mem_buf);
 112
 113     switch (n) {
 114     case 1 ... 31:
 115         env->regs[n] = tmp;
 116         break;
 117     case GDB_PC:
 118         env->pc = tmp;
 119         break;
 120     case GDB_MSR:
 121         mb_cpu_write_msr(env, tmp);
 122         break;
 123     case GDB_EAR:
 124         env->ear = tmp;
 125         break;
 126     case GDB_ESR:
 127         env->esr = tmp;
 128         break;
 129     case GDB_FSR:
 130         env->fsr = tmp;
 131         break;
 132     case GDB_BTR:
 133         env->btr = tmp;
 134         break;
 135     case GDB_EDR:
 136         env->edr = tmp;
 137         break;
 138     case GDB_SLR:
 139         env->slr = tmp;
 140         break;
 141     case GDB_SHR:
 142         env->shr = tmp;
 143         break;
 144     }
 145     return 4;
 146 }