LXR qemu/target/riscv/gdbstub.c

   1/*
   2 * RISC-V GDB Server Stub
   3 *
   4 * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms and conditions of the GNU General Public License,
   8 * version 2 or later, as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope it will be useful, but WITHOUT
  11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13 * more details.
  14 *
  15 * You should have received a copy of the GNU General Public License along with
  16 * this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19#include "qemu/osdep.h"
  20#include "qemu-common.h"
  21#include "exec/gdbstub.h"
  22#include "cpu.h"
  23
  24int riscv_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
  25{
  26    RISCVCPU *cpu = RISCV_CPU(cs);
  27    CPURISCVState *env = &cpu->env;
  28
  29    if (n < 32) {
  30        return gdb_get_regl(mem_buf, env->gpr[n]);
  31    } else if (n == 32) {
  32        return gdb_get_regl(mem_buf, env->pc);
  33    } else if (n < 65) {
  34        return gdb_get_reg64(mem_buf, env->fpr[n - 33]);
  35    } else if (n < 4096 + 65) {
  36        return gdb_get_regl(mem_buf, csr_read_helper(env, n - 65));
  37    }
  38    return 0;
  39}
  40
  41int riscv_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
  42{
  43    RISCVCPU *cpu = RISCV_CPU(cs);
  44    CPURISCVState *env = &cpu->env;
  45
  46    if (n == 0) {
  47        /* discard writes to x0 */
  48        return sizeof(target_ulong);
  49    } else if (n < 32) {
  50        env->gpr[n] = ldtul_p(mem_buf);
  51        return sizeof(target_ulong);
  52    } else if (n == 32) {
  53        env->pc = ldtul_p(mem_buf);
  54        return sizeof(target_ulong);
  55    } else if (n < 65) {
  56        env->fpr[n - 33] = ldq_p(mem_buf); /* always 64-bit */
  57        return sizeof(uint64_t);
  58    } else if (n < 4096 + 65) {
  59        csr_write_helper(env, ldtul_p(mem_buf), n - 65);
  60    }
  61    return 0;
  62}
  63