1  /* AMD64 calling conventions checking.
       2  
       3  Copyright 2000, 2001, 2004, 2007 Free Software Foundation, Inc.
       4  
       5  This file is part of the GNU MP Library test suite.
       6  
       7  The GNU MP Library test suite is free software; you can redistribute it
       8  and/or modify it under the terms of the GNU General Public License as
       9  published by the Free Software Foundation; either version 3 of the License,
      10  or (at your option) any later version.
      11  
      12  The GNU MP Library test suite is distributed in the hope that it will be
      13  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
      14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
      15  Public License for more details.
      16  
      17  You should have received a copy of the GNU General Public License along with
      18  the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
      19  
      20  #include <stdio.h>
      21  #include "gmp-impl.h"
      22  #include "tests.h"
      23  
      24  
      25  /* Vector if constants and register values.  We use one vector to allow access
      26     via a base pointer, very beneficial for the PIC-enabled amd64call.asm.  */
      27  mp_limb_t calling_conventions_values[23] =
      28  {
      29    CNST_LIMB(0x1234567887654321),	/* want_rbx */
      30    CNST_LIMB(0x89ABCDEFFEDCBA98),	/* want_rbp */
      31    CNST_LIMB(0xDEADBEEFBADECAFE),	/* want_r12 */
      32    CNST_LIMB(0xFFEEDDCCBBAA9988),	/* want_r13 */
      33    CNST_LIMB(0x0011223344556677),	/* want_r14 */
      34    CNST_LIMB(0x1234432156788765),	/* want_r15 */
      35  
      36    CNST_LIMB(0xFEEDABBACAAFBEED),	/* JUNK_RAX */
      37    CNST_LIMB(0xAB78DE89FF5125BB),	/* JUNK_R10 */
      38    CNST_LIMB(0x1238901890189031)		/* JUNK_R11 */
      39  
      40    /* rest of array used for dynamic values.  */
      41  };
      42  
      43  /* Index starts for various regions in above vector.  */
      44  #define WANT	0
      45  #define JUNK	6
      46  #define SAVE	9
      47  #define RETADDR	15
      48  #define VAL	16
      49  #define RFLAGS	22
      50  
      51  /* values to check */
      52  #ifdef __cplusplus
      53  extern "C" {
      54  #endif
      55  struct {
      56    int  control;
      57    int  status;
      58    int  tag;
      59    int  other[4];
      60  } calling_conventions_fenv;
      61  #ifdef __cplusplus
      62  }
      63  #endif
      64  
      65  
      66  const char *regname[6] = {"rbx", "rbp", "r12", "r13", "r14", "r15"};
      67  
      68  #define DIR_BIT(rflags)   (((rflags) & (1<<10)) != 0)
      69  
      70  
      71  /* Return 1 if ok, 0 if not */
      72  
      73  int
      74  calling_conventions_check (void)
      75  {
      76    const char  *header = "Violated calling conventions:\n";
      77    int  ret = 1;
      78    int i;
      79  
      80  #define CHECK(callreg, regstr, value)			\
      81    if (callreg != value)					\
      82      {							\
      83        printf ("%s   %s	got 0x%016lX want 0x%016lX\n",	\
      84  	      header, regstr, callreg, value);		\
      85        header = "";					\
      86        ret = 0;						\
      87      }
      88  
      89    for (i = 0; i < 6; i++)
      90      {
      91        CHECK (calling_conventions_values[VAL+i], regname[i], calling_conventions_values[WANT+i]);
      92      }
      93  
      94    if (DIR_BIT (calling_conventions_values[RFLAGS]) != 0)
      95      {
      96        printf ("%s   rflags dir bit  got %d want 0\n",
      97  	      header, DIR_BIT (calling_conventions_values[RFLAGS]));
      98        header = "";
      99        ret = 0;
     100      }
     101  
     102    if ((calling_conventions_fenv.tag & 0xFFFF) != 0xFFFF)
     103      {
     104        printf ("%s   fpu tags  got 0x%X want 0xFFFF\n",
     105  	      header, calling_conventions_fenv.tag & 0xFFFF);
     106        header = "";
     107        ret = 0;
     108      }
     109  
     110    return ret;
     111  }