Allow redirecting trace output to a file

c_emulator/riscv_platform_impl.h

@@ -2,6 +2,7 @@
 
 #include <stdbool.h>
 #include <stdint.h>
+#include <stdio.h>
 
 /* Settings of the platform implementation. */
 
@@ -32,5 +33,6 @@ extern uint64_t rv_clint_size;
 extern uint64_t rv_htif_tohost;
 extern uint64_t rv_insns_per_tick;
 
+extern FILE *trace_log;
 extern int term_fd;
 void plat_term_write_impl(char c);

c_emulator/riscv_prelude.c

@@ -1,5 +1,6 @@
 #include "riscv_prelude.h"
 #include "riscv_config.h"
+#include "riscv_platform_impl.h"
 
 unit print_string(sail_string prefix, sail_string msg)
 {
@@ -10,28 +11,28 @@ unit print_string(sail_string prefix, sail_string msg)
 unit print_instr(sail_string s)
 {
  if (config_print_instr)
- printf("%s\n", s);
+ fprintf(trace_log, "%s\n", s);
  return UNIT;
 }
 
 unit print_reg(sail_string s)
 {
  if (config_print_reg)
- printf("%s\n", s);
+ fprintf(trace_log, "%s\n", s);
  return UNIT;
 }
 
 unit print_mem_access(sail_string s)
 {
  if (config_print_mem_access)
- printf("%s\n", s);
+ fprintf(trace_log, "%s\n", s);
  return UNIT;
 }
 
 unit print_platform(sail_string s)
 {
  if (config_print_platform)
- printf("%s\n", s);
+ fprintf(trace_log, "%s\n", s);
  return UNIT;
 }
 

c_emulator/riscv_sim.c

@@ -1,3 +1,4 @@
+#include <ctype.h>
 #include <getopt.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -48,10 +49,14 @@ const char *RV32ISA = "RV32IMAC";
 #define CSR_MTVAL 0x343
 #define CSR_MIP 0x344
 
+#define OPT_TRACE_OUTPUT 1000
+
 static bool do_dump_dts = false;
 static bool do_show_times = false;
 struct tv_spike_t *s = NULL;
 char *term_log = NULL;
+static const char *trace_log_path = NULL;
+FILE *trace_log = NULL;
 char *dtb_file = NULL;
 unsigned char *dtb = NULL;
 size_t dtb_len = 0;
@@ -111,33 +116,34 @@ char *sailcov_file = NULL;
 #endif
 
 static struct option options[] = {
- {"enable-dirty-update", no_argument, 0, 'd'},
- {"enable-misaligned", no_argument, 0, 'm'},
- {"enable-pmp", no_argument, 0, 'P'},
- {"enable-next", no_argument, 0, 'N'},
- {"ram-size", required_argument, 0, 'z'},
- {"disable-compressed", no_argument, 0, 'C'},
- {"disable-writable-misa", no_argument, 0, 'I'},
- {"disable-fdext", no_argument, 0, 'F'},
- {"mtval-has-illegal-inst-bits", no_argument, 0, 'i'},
- {"device-tree-blob", required_argument, 0, 'b'},
- {"terminal-log", required_argument, 0, 't'},
- {"show-times", required_argument, 0, 'p'},
- {"report-arch", no_argument, 0, 'a'},
- {"test-signature", required_argument, 0, 'T'},
- {"signature-granularity", required_argument, 0, 'g'},
+ {"enable-dirty-update", no_argument, 0, 'd' },
+ {"enable-misaligned", no_argument, 0, 'm' },
+ {"enable-pmp", no_argument, 0, 'P' },
+ {"enable-next", no_argument, 0, 'N' },
+ {"ram-size", required_argument, 0, 'z' },
+ {"disable-compressed", no_argument, 0, 'C' },
+ {"disable-writable-misa", no_argument, 0, 'I' },
+ {"disable-fdext", no_argument, 0, 'F' },
+ {"mtval-has-illegal-inst-bits", no_argument, 0, 'i' },
+ {"device-tree-blob", required_argument, 0, 'b' },
+ {"terminal-log", required_argument, 0, 't' },
+ {"show-times", required_argument, 0, 'p' },
+ {"report-arch", no_argument, 0, 'a' },
+ {"test-signature", required_argument, 0, 'T' },
+ {"signature-granularity", required_argument, 0, 'g' },
 #ifdef RVFI_DII
- {"rvfi-dii", required_argument, 0, 'r'},
+ {"rvfi-dii", required_argument, 0, 'r' },
 #endif
- {"help", no_argument, 0, 'h'},
- {"trace", optional_argument, 0, 'v'},
- {"no-trace", optional_argument, 0, 'V'},
- {"inst-limit", required_argument, 0, 'l'},
- {"enable-zfinx", no_argument, 0, 'x'},
+ {"help", no_argument, 0, 'h' },
+ {"trace", optional_argument, 0, 'v' },
+ {"no-trace", optional_argument, 0, 'V' },
+ {"trace-output", required_argument, 0, OPT_TRACE_OUTPUT},
+ {"inst-limit", required_argument, 0, 'l' },
+ {"enable-zfinx", no_argument, 0, 'x' },
 #ifdef SAILCOV
- {"sailcov-file", required_argument, 0, 'c'},
+ {"sailcov-file", required_argument, 0, 'c' },
 #endif
- {0, 0, 0, 0 }
+ {0, 0, 0, 0  }
 };
 
 static void print_usage(const char *argv0, int ec)
@@ -151,7 +157,10 @@ static void print_usage(const char *argv0, int ec)
 #endif
  struct option *opt = options;
  while (opt->name) {
- fprintf(stdout, "\t -%c\t --%s\n", (char)opt->val, opt->name);
+ if (isprint(opt->val))
+ fprintf(stdout, "\t -%c\t --%s\n", (char)opt->val, opt->name);
+ else
+ fprintf(stdout, "\t \t --%s\n", opt->name);
  opt++;
  }
  exit(ec);
@@ -352,6 +361,10 @@ char *process_args(int argc, char **argv)
  sailcov_file = strdup(optarg);
  break;
 #endif
+ case OPT_TRACE_OUTPUT:
+ trace_log_path = optarg;
+ fprintf(stderr, "using %s for trace output.\n", trace_log_path);
+ break;
  case '?':
  print_usage(argv[0], 1);
  break;
@@ -626,6 +639,9 @@ void close_logs(void)
  exit(EXIT_FAILURE);
  }
 #endif
+ if (trace_log != stdout) {
+ fclose(trace_log);
+ }
 }
 
 void finish(int ec)
@@ -724,10 +740,8 @@ int compare_states(struct tv_spike_t *s)
 void flush_logs(void)
 {
  if (config_print_instr) {
- fprintf(stderr, "\n");
  fflush(stderr);
- fprintf(stdout, "\n");
- fflush(stdout);
+ fflush(trace_log);
  }
 }
 
@@ -1010,6 +1024,14 @@ void init_logs()
  exit(1);
  }
 
+ if (trace_log_path == NULL) {
+ trace_log = stdout;
+ } else if ((trace_log = fopen(trace_log_path, "w+")) < 0) {
+ fprintf(stderr, "Cannot create trace log '%s': %s\n", trace_log,
+ strerror(errno));
+ exit(1);
+ }
+
 #ifdef SAILCOV
  if (sailcov_file != NULL) {
  sail_set_coverage_file(sailcov_file);