Add a new function, so we can change reset vector from platforms
during runtime.

Signed-off-by: Chao-ying Fu <cfu@mips.com>
Signed-off-by: Djordje Todorovic <djordje.todorovic@htecgroup.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
---
 target/riscv/cpu.c | 14 ++++++++++++++
 target/riscv/cpu.h |  4 ++++
 2 files changed, 18 insertions(+)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index d055ddf462..74728c5371 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -73,6 +73,20 @@ bool riscv_cpu_option_set(const char *optname)
     return g_hash_table_contains(general_user_opts, optname);
 }
 
+#ifndef CONFIG_USER_ONLY
+void cpu_set_exception_base(int vp_index, target_ulong address)
+{
+    CPUState *cpu_state = qemu_get_cpu(vp_index);
+    if (cpu_state == NULL) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "cpu_set_exception_base: invalid vp_index: %u",
+                      vp_index);
+    }
+    RISCVCPU *vp = RISCV_CPU(cpu_state);
+    vp->env.resetvec = address;
+}
+#endif
+
 static void riscv_cpu_cfg_merge(RISCVCPUConfig *dest, const RISCVCPUConfig *src)
 {
 #define BOOL_FIELD(x) dest->x |= src->x;
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 4a862da615..34751bd414 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -672,6 +672,10 @@ G_NORETURN void riscv_raise_exception(CPURISCVState *env,
 target_ulong riscv_cpu_get_fflags(CPURISCVState *env);
 void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong);
 
+#ifndef CONFIG_USER_ONLY
+void cpu_set_exception_base(int vp_index, target_ulong address);
+#endif
+
 FIELD(TB_FLAGS, MEM_IDX, 0, 3)
 FIELD(TB_FLAGS, FS, 3, 2)
 /* Vector flags */
-- 
2.34.1