1  /* x86 calling conventions checking. */
       2  
       3  /*
       4  Copyright 2000, 2001, 2010 Free Software Foundation, Inc.
       5  
       6  This file is part of the GNU MP Library test suite.
       7  
       8  The GNU MP Library test suite is free software; you can redistribute it
       9  and/or modify it under the terms of the GNU General Public License as
      10  published by the Free Software Foundation; either version 3 of the License,
      11  or (at your option) any later version.
      12  
      13  The GNU MP Library test suite is distributed in the hope that it will be
      14  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
      15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
      16  Public License for more details.
      17  
      18  You should have received a copy of the GNU General Public License along with
      19  the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
      20  
      21  #include <stdio.h>
      22  #include "gmp-impl.h"
      23  #include "tests.h"
      24  
      25  
      26  /* Vector if constants and register values.  We use one vector to allow access
      27     via a base pointer, very beneficial for the PIC-enabled amd64call.asm.  */
      28  mp_limb_t calling_conventions_values[17] =
      29  {
      30    CNST_LIMB(0x12345678),	/* want_ebx */
      31    CNST_LIMB(0x89ABCDEF),	/* want_ebp */
      32    CNST_LIMB(0xDEADBEEF),	/* want_esi */
      33    CNST_LIMB(0xFFEEDDCC),	/* want_edi */
      34  
      35    CNST_LIMB(0xFEEDABBA),	/* JUNK_EAX */
      36    CNST_LIMB(0xAB78DE89),	/* JUNK_ECX */
      37    CNST_LIMB(0x12389018)		/* JUNK_EDX */
      38  
      39    /* rest of array used for dynamic values.  */
      40  };
      41  
      42  /* Index starts for various regions in above vector.  */
      43  #define WANT	0
      44  #define JUNK	4
      45  #define SAVE	7
      46  #define RETADDR	11
      47  #define VAL	12
      48  #define EFLAGS	16
      49  
      50  
      51  /* values to check */
      52  #ifdef __cplusplus
      53  extern "C" {
      54  #endif
      55  struct {
      56    unsigned  control;
      57    unsigned  status;
      58    unsigned  tag;
      59    unsigned  other[4];
      60  } calling_conventions_fenv;
      61  #ifdef __cplusplus
      62  }
      63  #endif
      64  
      65  /* expected values, as per x86call.asm */
      66  #define VALUE_EBX   0x01234567
      67  #define VALUE_ESI   0x89ABCDEF
      68  #define VALUE_EDI   0xFEDCBA98
      69  #define VALUE_EBP   0x76543210
      70  
      71  
      72  const char *regname[] = {"ebx", "ebp", "esi", "edi"};
      73  
      74  #define DIR_BIT(eflags)   (((eflags) & (1<<10)) != 0)
      75  
      76  
      77  /* Return 1 if ok, 0 if not */
      78  
      79  int
      80  calling_conventions_check (void)
      81  {
      82    const char  *header = "Violated calling conventions:\n";
      83    int  ret = 1;
      84    int i;
      85  
      86  #define CHECK(callreg, regstr, value)                   \
      87    if (callreg != value)                                 \
      88      {                                                   \
      89        printf ("%s   %s  got 0x%08X want 0x%08X\n",      \
      90                header, regstr, callreg, value);          \
      91        header = "";                                      \
      92        ret = 0;                                          \
      93      }
      94  
      95    for (i = 0; i < 4; i++)
      96      {
      97        CHECK (calling_conventions_values[VAL+i], regname[i], calling_conventions_values[WANT+i]);
      98      }
      99  
     100    if (DIR_BIT (calling_conventions_values[EFLAGS]) != 0)
     101      {
     102        printf ("%s   eflags dir bit  got %d want 0\n",
     103                header, DIR_BIT (calling_conventions_values[EFLAGS]));
     104        header = "";
     105        ret = 0;
     106      }
     107  
     108    if ((calling_conventions_fenv.tag & 0xFFFF) != 0xFFFF)
     109      {
     110        printf ("%s   fpu tags  got 0x%X want 0xFFFF\n",
     111                header, calling_conventions_fenv.tag & 0xFFFF);
     112        header = "";
     113        ret = 0;
     114      }
     115  
     116    return ret;
     117  }