diff --git a/hw/char/riscv_htif.c b/hw/char/riscv_htif.c
index 098de50e35..297c98c215 100644
--- a/hw/char/riscv_htif.c
+++ b/hw/char/riscv_htif.c
@@ -29,6 +29,8 @@
 #include "chardev/char-fe.h"
 #include "qemu/timer.h"
 #include "qemu/error-report.h"
+#include "exec/address-spaces.h"
+#include "sysemu/dma.h"
 
 #define RISCV_DEBUG_HTIF 0
 #define HTIF_DEBUG(fmt, ...)                                                   \
@@ -51,7 +53,10 @@
 /* PK system call number */
 #define PK_SYS_WRITE            64
 
-static uint64_t fromhost_addr, tohost_addr;
+const char *sig_file;
+uint8_t line_size = 16;
+
+static uint64_t fromhost_addr, tohost_addr, sig_addr, sig_len;
 
 void htif_symbol_callback(const char *st_name, int st_info, uint64_t st_value,
                           uint64_t st_size)
@@ -68,6 +73,10 @@ void htif_symbol_callback(const char *st_name, int st_info, uint64_t st_value,
             error_report("HTIF tohost must be 8 bytes");
             exit(1);
         }
+    } else if (strcmp("begin_signature", st_name) == 0) {
+        sig_addr = st_value;
+    } else if (strcmp("end_signature", st_name) == 0) {
+        sig_len = st_value - sig_addr;
     }
 }
 
@@ -161,6 +170,34 @@ static void htif_handle_tohost_write(HTIFState *s, uint64_t val_written)
         /* frontend syscall handler, shutdown and exit code support */
         if (cmd == HTIF_SYSTEM_CMD_SYSCALL) {
             if (payload & 0x1) {
+                /* Dump signature data to sig_file if specified */
+                if (sig_file) {
+                    char *sig_data = g_malloc(sig_len);
+                    dma_memory_read(&address_space_memory, sig_addr, sig_data,
+                                    sig_len, MEMTXATTRS_UNSPECIFIED);
+                    FILE *signature = fopen(sig_file, "w");
+                    if (signature == NULL) {
+                        error_report("open %s: %s", sig_file,
+                                     strerror(errno));
+                        exit(1);
+                    }
+
+                    for (int i = 0; i < sig_len; i += line_size) {
+                        for (int j = line_size; j > 0; j--) {
+                            if (i + j <= sig_len) {
+                                fprintf(signature, "%02x",
+                                        sig_data[i + j - 1] & 0xff);
+                            } else {
+                                fprintf(signature, "%02x", 0);
+                            }
+                        }
+                        fprintf(signature, "\n");
+                    }
+
+                    fclose(signature);
+                    g_free(sig_data);
+                }
+
                 /* exit code */
                 int exit_code = payload >> 1;
                 exit(exit_code);
diff --git a/hw/riscv/spike.c b/hw/riscv/spike.c
index a584d5b3a2..2c5546560a 100644
--- a/hw/riscv/spike.c
+++ b/hw/riscv/spike.c
@@ -332,6 +332,11 @@ static void spike_board_init(MachineState *machine)
                  htif_custom_base);
 }
 
+static void spike_set_signature(Object *obj, const char *val, Error **errp)
+{
+    sig_file = g_strdup(val);
+}
+
 static void spike_machine_instance_init(Object *obj)
 {
 }
@@ -350,6 +355,14 @@ static void spike_machine_class_init(ObjectClass *oc, void *data)
     mc->get_default_cpu_node_id = riscv_numa_get_default_cpu_node_id;
     mc->numa_mem_supported = true;
     mc->default_ram_id = "riscv.spike.ram";
+    object_class_property_add_str(oc, "signature", NULL, spike_set_signature);
+    object_class_property_set_description(oc, "signature",
+                                          "File to write ACT test signature");
+    object_class_property_add_uint8_ptr(oc, "signature-granularity",
+                                        &line_size, OBJ_PROP_FLAG_WRITE);
+    object_class_property_set_description(oc, "signature-granularity",
+                                          "Size of each line in ACT signature "
+                                          "file");
 }
 
 static const TypeInfo spike_machine_typeinfo = {
diff --git a/include/hw/char/riscv_htif.h b/include/hw/char/riscv_htif.h
index 5958c5b986..df493fdf6b 100644
--- a/include/hw/char/riscv_htif.h
+++ b/include/hw/char/riscv_htif.h
@@ -40,6 +40,9 @@ typedef struct HTIFState {
     uint64_t pending_read;
 } HTIFState;
 
+extern const char *sig_file;
+extern uint8_t line_size;
+
 /* HTIF symbol callback */
 void htif_symbol_callback(const char *st_name, int st_info, uint64_t st_value,
     uint64_t st_size);
