Merge branch 'next' of https://github.com/softwareradiosystems/srsLTE into enbmimo

lib/examples/cell_measurement.c

@@ -163,6 +163,8 @@ int main(int argc, char **argv) {
   float cfo = 0;
   bool acks[SRSLTE_MAX_CODEWORDS] = {false};
 
+  srslte_debug_handle_crash(argc, argv);
+
   if (parse_args(&prog_args, argc, argv)) {
     exit(-1);
   }

lib/examples/cell_search.c

@@ -153,6 +153,8 @@ int main(int argc, char **argv) {
   uint32_t freq;
   uint32_t n_found_cells=0;
   
+  srslte_debug_handle_crash(argc, argv);
+
   parse_args(argc, argv);
     
   printf("Opening RF device...\n");

lib/examples/pdsch_enodeb.c

@@ -701,6 +701,8 @@ int main(int argc, char **argv) {
   srslte_refsignal_t csr_refs;
   srslte_refsignal_t mbsfn_refs;
   
+  srslte_debug_handle_crash(argc, argv);
+
 #ifdef DISABLE_RF
   if (argc < 3) {
     usage(argv[0]);

lib/examples/pdsch_ue.c

@@ -341,6 +341,8 @@ int main(int argc, char **argv) {
   int sfn_offset;
   float cfo = 0; 
   
+  srslte_debug_handle_crash(argc, argv);
+
   parse_args(&prog_args, argc, argv);
   
   for (int i = 0; i< SRSLTE_MAX_CODEWORDS; i++) {

lib/include/srslte/phy/utils/debug.h

@@ -70,4 +70,6 @@ SRSLTE_API extern int srslte_verbose;
 #define ERROR(_fmt, ...) fprintf(stderr, "[ERROR in %s]:" _fmt "\n", __FUNCTION__, ##__VA_ARGS__)
 #endif /* CMAKE_BUILD_TYPE==Debug */
 
+void srslte_debug_handle_crash(int argc, char **argv);
+
 #endif // DEBUG_H

lib/include/srslte/phy/utils/simd.h

@@ -449,7 +449,12 @@ static inline simd_f_t srslte_simd_f_sqrt(simd_f_t a) {
 #ifdef HAVE_NEON
   float32x4_t sqrt_reciprocal = vrsqrteq_f32(a);
   sqrt_reciprocal = vmulq_f32(vrsqrtsq_f32(vmulq_f32(a,sqrt_reciprocal), sqrt_reciprocal),sqrt_reciprocal);
-  return vmulq_f32(a,sqrt_reciprocal);
+  float32x4_t result = vmulq_f32(a,sqrt_reciprocal);
+
+  /* Detect zeros in NEON 1/sqrtf for preventing NaN */
+  float32x4_t zeros = vmovq_n_f32(0);    /* Zero vector */
+  uint32x4_t mask = vceqq_f32(a, zeros); /* Zero vector mask */
+  return vbslq_f32(mask, zeros, result); /* Force zero results and return */
 #endif /* HAVE_NEON */  
 #endif /* LV_HAVE_SSE */
 #endif /* LV_HAVE_AVX2 */

lib/src/phy/utils/debug.c

@@ -24,7 +24,14 @@
  *
  */
 
+#include <pthread.h>
+#include <stdio.h>
+#include <execinfo.h>
+#include <signal.h>
+#include <stdlib.h>
+
 #include "srslte/phy/utils/debug.h"
+#include "srslte/version.h"
 
 int srslte_verbose = 0;
 
@@ -37,3 +44,57 @@ void get_time_interval(struct timeval * tdata) {
     tdata[0].tv_usec += 1000000;
   }
 }
+
+const static char crash_file_name[] = "./srsLTE.backtrace.crash";
+static int bt_argc;
+static char **bt_argv;
+
+static void crash_handler(int sig) {
+  void *array[128];
+  int size;
+
+  /* Get all stack traces */
+  size = backtrace(array, 128);
+
+  FILE *f = fopen(crash_file_name, "a");
+  if (!f) {
+    printf("srsLTE crashed... we could not save backtrace in '%s'...\n", crash_file_name);
+  } else {
+    char **symbols = backtrace_symbols(array, size);
+
+    time_t lnTime;
+    struct tm *stTime;
+    char strdate[32];
+
+    time(&lnTime);
+    stTime = localtime(&lnTime);
+
+    strftime(strdate, 32, "%d/%m/%Y %H:%M:%S", stTime);
+
+    fprintf(f, "--- command='");
+    for (int i = 0; i < bt_argc; i++) {
+      fprintf(f, "%s%s", (i == 0) ? "" : " ", bt_argv[i]);
+    }
+    fprintf(f, "' version=%s signal=%d date='%s' ---\n", SRSLTE_VERSION_STRING, sig, strdate);
+
+    for (int i = 0; i < size; i++) {
+      fprintf(f, "\t%s\n", symbols[i]);
+    }
+    fprintf(f, "\n");
+
+    printf("srsLTE crashed... backtrace saved in '%s'...\n", crash_file_name);
+    fclose(f);
+  }
+  printf("---  exiting  ---\n");
+  exit(1);
+}
+
+void srslte_debug_handle_crash(int argc, char **argv) {
+  bt_argc = argc;
+  bt_argv = argv;
+
+  signal(SIGSEGV, crash_handler);
+  signal(SIGABRT, crash_handler);
+  signal(SIGILL, crash_handler);
+  signal(SIGFPE, crash_handler);
+}

lib/src/phy/utils/test/vector_test.c

@@ -502,6 +502,7 @@ TEST(srslte_vec_abs_cf,
   for (int i = 0; i < block_size; i++) {
     x[i] = RANDOM_CF();
   }
+  x[0] = 0.0f;
 
   TEST_CALL(srslte_vec_abs_cf(x, z, block_size))
 

srsenb/src/main.cc

@@ -353,6 +353,8 @@ int main(int argc, char *argv[])
   metrics_stdout    metrics;
   enb              *enb = enb::get_instance();
 
+  srslte_debug_handle_crash(argc, argv);
+
   cout << "---  Software Radio Systems LTE eNodeB  ---" << endl << endl;
 
   parse_args(&args, argc, argv);

srsue/src/main.cc

@@ -374,6 +374,9 @@ int main(int argc, char *argv[])
   srslte::metrics_hub<ue_metrics_t> metricshub;
   signal(SIGINT, sig_int_handler);
   all_args_t args;
+
+  srslte_debug_handle_crash(argc, argv);
+
   parse_args(&args, argc, argv);
 
   srsue_instance_type_t type = LTE;