[PATCH 1/2] target/riscv: Add a function to refresh the dynamic CSRs xml.

[Tommy Wu]

When we change the cpu extension state after the cpu is
realized, we cannot print the value of some CSRs in the remote
gdb debugger. The root cause is that the dynamic CSR xml is
generated when the cpu is realized.

This patch add a function to refresh the dynamic CSR xml after
the cpu is realized.

Signed-off-by: Tommy Wu <tommy...@sifive.com>
Reviewed-by: Frank Chang <frank.ch...@sifive.com>
---
 target/riscv/cpu.h     |  2 ++
 target/riscv/gdbstub.c | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index de7e43126a..dc8e592275 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -494,6 +494,7 @@ struct ArchCPU {
     CPUNegativeOffsetState neg;
     CPURISCVState env;
 
+    int dyn_csr_base_reg;
     char *dyn_csr_xml;
     char *dyn_vreg_xml;
 
@@ -781,6 +782,7 @@ void riscv_get_csr_ops(int csrno, riscv_csr_operations 
*ops);
 void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops);
 
 void riscv_cpu_register_gdb_regs_for_features(CPUState *cs);
+void riscv_refresh_dynamic_csr_xml(CPUState *cs);
 
 uint8_t satp_mode_max_from_map(uint32_t map);
 const char *satp_mode_str(uint8_t satp_mode, bool is_32_bit);
diff --git a/target/riscv/gdbstub.c b/target/riscv/gdbstub.c
index 524bede865..9e97ee2c35 100644
--- a/target/riscv/gdbstub.c
+++ b/target/riscv/gdbstub.c
@@ -230,6 +230,8 @@ static int riscv_gen_dynamic_csr_xml(CPUState *cs, int 
base_reg)
         bitsize = 64;
     }
 
+    cpu->dyn_csr_base_reg = base_reg;
+
     g_string_printf(s, "<?xml version=\"1.0\"?>");
     g_string_append_printf(s, "<!DOCTYPE feature SYSTEM \"gdb-target.dtd\">");
     g_string_append_printf(s, "<feature name=\"org.gnu.gdb.riscv.csr\">");
@@ -349,3 +351,13 @@ void riscv_cpu_register_gdb_regs_for_features(CPUState *cs)
                                  "riscv-csr.xml", 0);
     }
 }
+
+void riscv_refresh_dynamic_csr_xml(CPUState *cs)
+{
+    RISCVCPU *cpu = RISCV_CPU(cs);
+    if (!cpu->dyn_csr_xml) {
+        g_assert_not_reached();
+    }
+    g_free(cpu->dyn_csr_xml);
+    riscv_gen_dynamic_csr_xml(cs, cpu->dyn_csr_base_reg);
+}
-- 
2.38.1