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/*
* Xtensa gdb server stub
*
* Copyright (c) 2003-2005 Fabrice Bellard
* Copyright (c) 2013 SUSE LINUX Products GmbH
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "cpu.h"
#include "exec/gdbstub.h"
#include "qemu/log.h"
enum {
xtRegisterTypeArRegfile = 1, /* Register File ar0..arXX. */
xtRegisterTypeSpecialReg, /* CPU states, such as PS, Booleans, (rsr). */
xtRegisterTypeUserReg, /* User defined registers (rur). */
xtRegisterTypeTieRegfile, /* User define register files. */
xtRegisterTypeTieState, /* TIE States (mapped on user regs). */
xtRegisterTypeMapped, /* Mapped on Special Registers. */
xtRegisterTypeUnmapped, /* Special case of masked registers. */
xtRegisterTypeWindow, /* Live window registers (a0..a15). */
xtRegisterTypeVirtual, /* PC, FP. */
xtRegisterTypeUnknown
};
#define XTENSA_REGISTER_FLAGS_PRIVILEGED 0x0001
#define XTENSA_REGISTER_FLAGS_READABLE 0x0002
#define XTENSA_REGISTER_FLAGS_WRITABLE 0x0004
#define XTENSA_REGISTER_FLAGS_VOLATILE 0x0008
void xtensa_count_regs(const XtensaConfig *config,
unsigned *n_regs, unsigned *n_core_regs)
{
unsigned i;
bool count_core_regs = true;
for (i = 0; config->gdb_regmap.reg[i].targno >= 0; ++i) {
if (config->gdb_regmap.reg[i].type != xtRegisterTypeTieState &&
config->gdb_regmap.reg[i].type != xtRegisterTypeMapped &&
config->gdb_regmap.reg[i].type != xtRegisterTypeUnmapped) {
++*n_regs;
if (count_core_regs) {
if ((config->gdb_regmap.reg[i].flags &
XTENSA_REGISTER_FLAGS_PRIVILEGED) == 0) {
++*n_core_regs;
} else {
count_core_regs = false;
}
}
}
}
}
int xtensa_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
{
XtensaCPU *cpu = XTENSA_CPU(cs);
CPUXtensaState *env = &cpu->env;
const XtensaGdbReg *reg = env->config->gdb_regmap.reg + n;
#ifdef CONFIG_USER_ONLY
int num_regs = env->config->gdb_regmap.num_core_regs;
#else
int num_regs = env->config->gdb_regmap.num_regs;
#endif
unsigned i;
if (n < 0 || n >= num_regs) {
return 0;
}
switch (reg->type) {
case xtRegisterTypeVirtual: /*pc*/
return gdb_get_reg32(mem_buf, env->pc);
case xtRegisterTypeArRegfile: /*ar*/
xtensa_sync_phys_from_window(env);
return gdb_get_reg32(mem_buf, env->phys_regs[(reg->targno & 0xff)
% env->config->nareg]);
case xtRegisterTypeSpecialReg: /*SR*/
return gdb_get_reg32(mem_buf, env->sregs[reg->targno & 0xff]);
case xtRegisterTypeUserReg: /*UR*/
return gdb_get_reg32(mem_buf, env->uregs[reg->targno & 0xff]);
case xtRegisterTypeTieRegfile: /*f*/
i = reg->targno & 0x0f;
switch (reg->size) {
case 4:
return gdb_get_reg32(mem_buf,
float32_val(env->fregs[i].f32[FP_F32_LOW]));
case 8:
return gdb_get_reg64(mem_buf, float64_val(env->fregs[i].f64));
default:
qemu_log_mask(LOG_UNIMP, "%s from reg %d of unsupported size %d\n",
__func__, n, reg->size);
memset(mem_buf, 0, reg->size);
return reg->size;
}
case xtRegisterTypeWindow: /*a*/
return gdb_get_reg32(mem_buf, env->regs[reg->targno & 0x0f]);
default:
qemu_log_mask(LOG_UNIMP, "%s from reg %d of unsupported type %d\n",
__func__, n, reg->type);
memset(mem_buf, 0, reg->size);
return reg->size;
}
}
int xtensa_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
{
XtensaCPU *cpu = XTENSA_CPU(cs);
CPUXtensaState *env = &cpu->env;
uint32_t tmp;
const XtensaGdbReg *reg = env->config->gdb_regmap.reg + n;
#ifdef CONFIG_USER_ONLY
int num_regs = env->config->gdb_regmap.num_core_regs;
#else
int num_regs = env->config->gdb_regmap.num_regs;
#endif
if (n < 0 || n >= num_regs) {
return 0;
}
tmp = ldl_p(mem_buf);
switch (reg->type) {
case xtRegisterTypeVirtual: /*pc*/
env->pc = tmp;
break;
case xtRegisterTypeArRegfile: /*ar*/
env->phys_regs[(reg->targno & 0xff) % env->config->nareg] = tmp;
xtensa_sync_window_from_phys(env);
break;
case xtRegisterTypeSpecialReg: /*SR*/
env->sregs[reg->targno & 0xff] = tmp;
break;
case xtRegisterTypeUserReg: /*UR*/
env->uregs[reg->targno & 0xff] = tmp;
break;
case xtRegisterTypeTieRegfile: /*f*/
switch (reg->size) {
case 4:
env->fregs[reg->targno & 0x0f].f32[FP_F32_LOW] = make_float32(tmp);
return 4;
case 8:
env->fregs[reg->targno & 0x0f].f64 = make_float64(tmp);
return 8;
default:
qemu_log_mask(LOG_UNIMP, "%s to reg %d of unsupported size %d\n",
__func__, n, reg->size);
return reg->size;
}
case xtRegisterTypeWindow: /*a*/
env->regs[reg->targno & 0x0f] = tmp;
break;
default:
qemu_log_mask(LOG_UNIMP, "%s to reg %d of unsupported type %d\n",
__func__, n, reg->type);
return reg->size;
}
return 4;
}
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