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/*
* RISC-V GDB Server Stub
*
* Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "exec/gdbstub.h"
#include "cpu.h"
int riscv_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
{
RISCVCPU *cpu = RISCV_CPU(cs);
CPURISCVState *env = &cpu->env;
if (n < 32) {
return gdb_get_regl(mem_buf, env->gpr[n]);
} else if (n == 32) {
return gdb_get_regl(mem_buf, env->pc);
} else if (n < 65) {
return gdb_get_reg64(mem_buf, env->fpr[n - 33]);
} else if (n < 4096 + 65) {
target_ulong val = 0;
if (riscv_csrrw(env, n - 65, &val, 0, 0) == 0) {
return gdb_get_regl(mem_buf, val);
}
}
return 0;
}
int riscv_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
{
RISCVCPU *cpu = RISCV_CPU(cs);
CPURISCVState *env = &cpu->env;
if (n == 0) {
/* discard writes to x0 */
return sizeof(target_ulong);
} else if (n < 32) {
env->gpr[n] = ldtul_p(mem_buf);
return sizeof(target_ulong);
} else if (n == 32) {
env->pc = ldtul_p(mem_buf);
return sizeof(target_ulong);
} else if (n < 65) {
env->fpr[n - 33] = ldq_p(mem_buf); /* always 64-bit */
return sizeof(uint64_t);
} else if (n < 4096 + 65) {
target_ulong val = ldtul_p(mem_buf);
if (riscv_csrrw(env, n - 65, NULL, val, -1) == 0) {
return sizeof(target_ulong);
}
}
return 0;
}
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