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 enum { 27 xtRegisterTypeArRegfile = 1, /* Register File ar0..arXX. */ 28 xtRegisterTypeSpecialReg, /* CPU states, such as PS, Booleans, (rsr). */ 29 xtRegisterTypeUserReg, /* User defined registers (rur). */ 30 xtRegisterTypeTieRegfile, /* User define register files. */ 31 xtRegisterTypeTieState, /* TIE States (mapped on user regs). */ 32 xtRegisterTypeMapped, /* Mapped on Special Registers. */ 33 xtRegisterTypeUnmapped, /* Special case of masked registers. */ 34 xtRegisterTypeWindow, /* Live window registers (a0..a15). */ 35 xtRegisterTypeVirtual, /* PC, FP. */ 36 xtRegisterTypeUnknown 37 }; 38 39 #define XTENSA_REGISTER_FLAGS_PRIVILEGED 0x0001 40 #define XTENSA_REGISTER_FLAGS_READABLE 0x0002 41 #define XTENSA_REGISTER_FLAGS_WRITABLE 0x0004 42 #define XTENSA_REGISTER_FLAGS_VOLATILE 0x0008 43 44 void xtensa_count_regs(const XtensaConfig *config, 45 unsigned *n_regs, unsigned *n_core_regs) 46 { 47 unsigned i; 48 49 for (i = 0; config->gdb_regmap.reg[i].targno >= 0; ++i) { 50 if (config->gdb_regmap.reg[i].type != xtRegisterTypeTieState && 51 config->gdb_regmap.reg[i].type != xtRegisterTypeMapped && 52 config->gdb_regmap.reg[i].type != xtRegisterTypeUnmapped) { 53 ++*n_regs; 54 if ((config->gdb_regmap.reg[i].flags & 55 XTENSA_REGISTER_FLAGS_PRIVILEGED) == 0) { 56 ++*n_core_regs; 57 } 58 } 59 } 60 } 61 62 int xtensa_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n) 63 { 64 XtensaCPU *cpu = XTENSA_CPU(cs); 65 CPUXtensaState *env = &cpu->env; 66 const XtensaGdbReg *reg = env->config->gdb_regmap.reg + n; 67 #ifdef CONFIG_USER_ONLY 68 int num_regs = env->config->gdb_regmap.num_core_regs; 69 #else 70 int num_regs = env->config->gdb_regmap.num_regs; 71 #endif 72 unsigned i; 73 74 if (n < 0 || n >= num_regs) { 75 return 0; 76 } 77 78 switch (reg->type) { 79 case xtRegisterTypeVirtual: /*pc*/ 80 return gdb_get_reg32(mem_buf, env->pc); 81 82 case xtRegisterTypeArRegfile: /*ar*/ 83 xtensa_sync_phys_from_window(env); 84 return gdb_get_reg32(mem_buf, env->phys_regs[(reg->targno & 0xff) 85 % env->config->nareg]); 86 87 case xtRegisterTypeSpecialReg: /*SR*/ 88 return gdb_get_reg32(mem_buf, env->sregs[reg->targno & 0xff]); 89 90 case xtRegisterTypeUserReg: /*UR*/ 91 return gdb_get_reg32(mem_buf, env->uregs[reg->targno & 0xff]); 92 93 case xtRegisterTypeTieRegfile: /*f*/ 94 i = reg->targno & 0x0f; 95 switch (reg->size) { 96 case 4: 97 return gdb_get_reg32(mem_buf, 98 float32_val(env->fregs[i].f32[FP_F32_LOW])); 99 case 8: 100 return gdb_get_reg64(mem_buf, float64_val(env->fregs[i].f64)); 101 default: 102 qemu_log_mask(LOG_UNIMP, "%s from reg %d of unsupported size %d\n", 103 __func__, n, reg->size); 104 memset(mem_buf, 0, reg->size); 105 return reg->size; 106 } 107 108 case xtRegisterTypeWindow: /*a*/ 109 return gdb_get_reg32(mem_buf, env->regs[reg->targno & 0x0f]); 110 111 default: 112 qemu_log_mask(LOG_UNIMP, "%s from reg %d of unsupported type %d\n", 113 __func__, n, reg->type); 114 memset(mem_buf, 0, reg->size); 115 return reg->size; 116 } 117 } 118 119 int xtensa_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n) 120 { 121 XtensaCPU *cpu = XTENSA_CPU(cs); 122 CPUXtensaState *env = &cpu->env; 123 uint32_t tmp; 124 const XtensaGdbReg *reg = env->config->gdb_regmap.reg + n; 125 #ifdef CONFIG_USER_ONLY 126 int num_regs = env->config->gdb_regmap.num_core_regs; 127 #else 128 int num_regs = env->config->gdb_regmap.num_regs; 129 #endif 130 131 if (n < 0 || n >= num_regs) { 132 return 0; 133 } 134 135 tmp = ldl_p(mem_buf); 136 137 switch (reg->type) { 138 case xtRegisterTypeVirtual: /*pc*/ 139 env->pc = tmp; 140 break; 141 142 case xtRegisterTypeArRegfile: /*ar*/ 143 env->phys_regs[(reg->targno & 0xff) % env->config->nareg] = tmp; 144 xtensa_sync_window_from_phys(env); 145 break; 146 147 case xtRegisterTypeSpecialReg: /*SR*/ 148 env->sregs[reg->targno & 0xff] = tmp; 149 break; 150 151 case xtRegisterTypeUserReg: /*UR*/ 152 env->uregs[reg->targno & 0xff] = tmp; 153 break; 154 155 case xtRegisterTypeTieRegfile: /*f*/ 156 switch (reg->size) { 157 case 4: 158 env->fregs[reg->targno & 0x0f].f32[FP_F32_LOW] = make_float32(tmp); 159 return 4; 160 case 8: 161 env->fregs[reg->targno & 0x0f].f64 = make_float64(tmp); 162 return 8; 163 default: 164 qemu_log_mask(LOG_UNIMP, "%s to reg %d of unsupported size %d\n", 165 __func__, n, reg->size); 166 return reg->size; 167 } 168 169 case xtRegisterTypeWindow: /*a*/ 170 env->regs[reg->targno & 0x0f] = tmp; 171 break; 172 173 default: 174 qemu_log_mask(LOG_UNIMP, "%s to reg %d of unsupported type %d\n", 175 __func__, n, reg->type); 176 return reg->size; 177 } 178 179 return 4; 180 } 181