GDB Register read and write routines. Signed-off-by: Michael Clark <m...@sifive.com> --- target/riscv/gdbstub.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 target/riscv/gdbstub.c
diff --git a/target/riscv/gdbstub.c b/target/riscv/gdbstub.c new file mode 100644 index 0000000..12d1d9f --- /dev/null +++ b/target/riscv/gdbstub.c @@ -0,0 +1,59 @@ +/* + * RISC-V GDB Server Stub + * + * Author: Sagar Karandikar, sag...@eecs.berkeley.edu + * + * + * 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 "exec/gdbstub.h" +#include "cpu.h" + +int riscv_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n) +{ + /* TODO proper x0 handling */ + 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]); + } + return 0; +} + +int riscv_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n) +{ + /* TODO proper x0 handling */ + RISCVCPU *cpu = RISCV_CPU(cs); + CPURISCVState *env = &cpu->env; + + 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); + } + return 0; +} -- 2.7.0
