--- old/usr/src/test/os-tests/tests/xsave/xregs_set.c
          +++ new/usr/src/test/os-tests/tests/xsave/xregs_set.c

   1    1  /*
   2    2   * This file and its contents are supplied under the terms of the
   3    3   * Common Development and Distribution License ("CDDL"), version 1.0.
   4    4   * You may only use this file in accordance with the terms of version
   5    5   * 1.0 of the CDDL.
   6    6   *
   7    7   * A full copy of the text of the CDDL should have accompanied this
   8    8   * source.  A copy of the CDDL is also available via the Internet at
   9    9   * http://www.illumos.org/license/CDDL.
  10   10   */
  11   11  
  12   12  /*
  13   13   * Copyright 2023 Oxide Computer Company
  14   14   */
  15   15  
  16   16  /*
  17   17   * This is a program that is meant to be used as a target for libproc and mdb.
  18   18   * It uses a CLI-based seed and sets its FPU to a set of known values. After
  19   19   * that, we call a function that can be used as a no-op target to dump the FPU
  20   20   * state, attempting to minimize the number of instructions inbetween
  21   21   * operations. We use the 'yield(2)' system call and library function in libc
  22   22   * for that as it's something that'll not really do much and it is very unlikely
  23   23   * the compiler will use the FPU between function calls.
  24   24   */
  25   25  
  26   26  #include <err.h>
  27   27  #include <stdlib.h>
  28   28  #include <unistd.h>
  29   29  #include <errno.h>
  30   30  
  31   31  #include "xsave_util.h"
  32   32  
  33   33  static xsu_fpu_t fpu;
  34   34  
  35   35  int
  36   36  main(int argc, char *argv[])
  37   37  {
  38   38          uint32_t hwsup;
  39   39          char *eptr;
  40   40          unsigned long ul;
  41   41  
  42   42          if (argc != 2) {
  43   43                  errx(EXIT_FAILURE, "missing required seed");
  44   44          }
  45   45  
  46   46          errno = 0;
  47   47          ul = strtoul(argv[1], &eptr, 0);
  48   48          if (errno != 0 || *eptr != '\0') {
  49   49                  errx(EXIT_FAILURE, "seed value is bad: %s", argv[3]);
  50   50          }
  51   51  
  52   52          hwsup = xsu_hwsupport();
  53   53          xsu_fill(&fpu, hwsup, (uint32_t)ul);
  54   54          xsu_setfpu(&fpu, hwsup);
  55   55  
  56   56          yield();
  57   57          return (EXIT_SUCCESS);
  58   58  }

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