libgloss/arc/hl/hl_clock.c

   1 /*
   2  * hl_clock.c -- provide _clock() and _times().
   3  *
   4  * Copyright (c) 2024 Synopsys Inc.
   5  *
   6  * The authors hereby grant permission to use, copy, modify, distribute,
   7  * and license this software and its documentation for any purpose, provided
   8  * that existing copyright notices are retained in all copies and that this
   9  * notice is included verbatim in any distributions. No written agreement,
  10  * license, or royalty fee is required for any of the authorized uses.
  11  * Modifications to this software may be copyrighted by their authors
  12  * and need not follow the licensing terms described here, provided that
  13  * the new terms are clearly indicated on the first page of each file where
  14  * they apply.
  15  *
  16  */
  17
  18 #include <errno.h>
  19 #include <stdint.h>
  20 #include <time.h>
  21 #include <sys/times.h>
  22
  23 #include "../arc-timer.h"
  24
  25 #include "hl_toolchain.h"
  26 #include "hl_api.h"
  27
  28 /* Implements HL_SYSCALL_CLOCK.  */
  29 static __always_inline clock_t
  30 _hl_clock (void)
  31 {
  32   uint32_t ret;
  33   volatile __uncached char *p;
  34
  35   p = _hl_message (HL_SYSCALL_CLOCK, ":i", (uint32_t *) &ret);
  36
  37   _hl_delete ();
  38
  39   if (p == NULL)
  40     {
  41       errno = ETIMEDOUT;
  42       return -1;
  43     }
  44
  45   return ret;
  46 }
  47
  48 /*
  49  * This implementation returns timer 0 value if it exists or
  50  * host clock() value converted to target clocks.
  51  *
  52  * Please note that this value cannot be converted to seconds
  53  * using CLOCKS_PER_SEC.
  54  */
  55 clock_t
  56 _clock (void)
  57 {
  58   if (_arc_timer_default_present ())
  59     return _arc_timer_default_read ();
  60   else
  61     return _hl_clock ();
  62 }
  63
  64 /* All time is counted as user time.  */
  65 clock_t
  66 _times (struct tms *tp)
  67 {
  68   clock_t ret;
  69
  70   if (tp == NULL)
  71     {
  72       errno = EFAULT;
  73       return -1;
  74     }
  75
  76   ret = _clock ();
  77
  78   if (ret == (clock_t) -1)
  79     return ret;
  80
  81   tp->tms_utime = ret;
  82   tp->tms_stime = 0;
  83   tp->tms_cutime = 0;
  84   tp->tms_cstime = 0;
  85
  86   return ret;
  87 }