hw/riscv: Add signature dump function for spike to run ACT tests

Add signature and signature-granularity properties in spike to specify the target
signatrue file and the line size for signature data.

Recgonize the signature section between begin_signature and end_signature symbols
when loading elf of ACT tests. Then dump signature data in signature section just
before the ACT tests exit.

Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20230405095720.75848-2-liweiwei@iscas.ac.cn>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

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, begin_sig_addr, end_sig_addr;
 
 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) {
+        begin_sig_addr = st_value;
+    } else if (strcmp("end_signature", st_name) == 0) {
+        end_sig_addr = st_value;
     }
 }
 
@@ -163,6 +172,39 @@ static void htif_handle_tohost_write(HTIFState *s, uint64_t val_written)
             if (payload & 0x1) {
                 /* exit code */
                 int exit_code = payload >> 1;
+
+                /*
+                 * Dump signature data if sig_file is specified and
+                 * begin/end_signature symbols exist.
+                 */
+                if (sig_file && begin_sig_addr && end_sig_addr) {
+                    uint64_t sig_len = end_sig_addr - begin_sig_addr;
+                    char *sig_data = g_malloc(sig_len);
+                    dma_memory_read(&address_space_memory, begin_sig_addr,
+                                    sig_data, sig_len, MEMTXATTRS_UNSPECIFIED);
+                    FILE *signature = fopen(sig_file, "w");
+                    if (signature == NULL) {
+                        error_report("Unable to open %s with error %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(exit_code);
             } else {
                 uint64_t syscall[8];

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 = {

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);