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 "gdbstub/helpers.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 }; 43 44 enum { 45 GDB_SP_SHL, 46 GDB_SP_SHR, 47 }; 48 49 int mb_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n) 50 { 51 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs); 52 CPUClass *cc = CPU_GET_CLASS(cs); 53 CPUMBState *env = &cpu->env; 54 uint32_t val; 55 56 if (n > cc->gdb_num_core_regs) { 57 return 0; 58 } 59 60 switch (n) { 61 case 1 ... 31: 62 val = env->regs[n]; 63 break; 64 case GDB_PC: 65 val = env->pc; 66 break; 67 case GDB_MSR: 68 val = mb_cpu_read_msr(env); 69 break; 70 case GDB_EAR: 71 val = env->ear; 72 break; 73 case GDB_ESR: 74 val = env->esr; 75 break; 76 case GDB_FSR: 77 val = env->fsr; 78 break; 79 case GDB_BTR: 80 val = env->btr; 81 break; 82 case GDB_PVR0 ... GDB_PVR11: 83 /* PVR12 is intentionally skipped */ 84 val = cpu->cfg.pvr_regs[n - GDB_PVR0]; 85 break; 86 case GDB_EDR: 87 val = env->edr; 88 break; 89 default: 90 /* Other SRegs aren't modeled, so report a value of 0 */ 91 val = 0; 92 break; 93 } 94 return gdb_get_reg32(mem_buf, val); 95 } 96 97 int mb_cpu_gdb_read_stack_protect(CPUState *cs, GByteArray *mem_buf, int n) 98 { 99 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs); 100 CPUMBState *env = &cpu->env; 101 uint32_t val; 102 103 switch (n) { 104 case GDB_SP_SHL: 105 val = env->slr; 106 break; 107 case GDB_SP_SHR: 108 val = env->shr; 109 break; 110 default: 111 return 0; 112 } 113 return gdb_get_reg32(mem_buf, val); 114 } 115 116 int mb_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n) 117 { 118 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs); 119 CPUClass *cc = CPU_GET_CLASS(cs); 120 CPUMBState *env = &cpu->env; 121 uint32_t tmp; 122 123 if (n > cc->gdb_num_core_regs) { 124 return 0; 125 } 126 127 tmp = ldl_p(mem_buf); 128 129 switch (n) { 130 case 1 ... 31: 131 env->regs[n] = tmp; 132 break; 133 case GDB_PC: 134 env->pc = tmp; 135 break; 136 case GDB_MSR: 137 mb_cpu_write_msr(env, tmp); 138 break; 139 case GDB_EAR: 140 env->ear = tmp; 141 break; 142 case GDB_ESR: 143 env->esr = tmp; 144 break; 145 case GDB_FSR: 146 env->fsr = tmp; 147 break; 148 case GDB_BTR: 149 env->btr = tmp; 150 break; 151 case GDB_EDR: 152 env->edr = tmp; 153 break; 154 } 155 return 4; 156 } 157 158 int mb_cpu_gdb_write_stack_protect(CPUState *cs, uint8_t *mem_buf, int n) 159 { 160 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs); 161 CPUMBState *env = &cpu->env; 162 163 switch (n) { 164 case GDB_SP_SHL: 165 env->slr = ldl_p(mem_buf); 166 break; 167 case GDB_SP_SHR: 168 env->shr = ldl_p(mem_buf); 169 break; 170 default: 171 return 0; 172 } 173 return 4; 174 } 175