Re: [PATCH v3 1/1] hw/riscv: Add signature dump function for spike to run ACT tests

[Alistair Francis]

On Tue, Mar 7, 2023 at 1:30 PM Weiwei Li <liweiwei@iscas.ac.cn> wrote:
>
> 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>
> ---
>  hw/char/riscv_htif.c         | 39 +++++++++++++++++++++++++++++++++++-
>  hw/riscv/spike.c             | 13 ++++++++++++
>  include/hw/char/riscv_htif.h |  3 +++
>  3 files changed, 54 insertions(+), 1 deletion(-)
>
> 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;

What if sig_addr isn't initialised, won't this give us a really wrong length?

We should have a default address or check that it has been set

>      }
>  }
>
> @@ -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,

The error should be "Unable to open %s with error %s" to be more clear

Alistair

> +                                     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);
> --
> 2.25.1
>
>