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