gcc/ginclude/va-ppc.h

   1 /* GNU C varargs support for the PowerPC with either the V.4 or Windows NT calling sequences */
   2
   3 #ifndef _WIN32
   4 /* System V.4 support */
   5 /* Define __gnuc_va_list.  */
   6
   7 #ifndef __GNUC_VA_LIST
   8 #define __GNUC_VA_LIST
   9
  10 #ifndef _SYS_VA_LIST_H
  11 #define _SYS_VA_LIST_H          /* Solaris sys/va_list.h */
  12
  13 /* Solaris decided to rename overflow_arg_area to input_arg_area,
  14    so handle it via a macro.  */
  15 #define __va_overflow(AP) (AP)->overflow_arg_area
  16
  17 /* Note that the names in this structure are in the user's namespace, but
  18    that the V.4 abi explicitly states that these names should be used.  */
  19 typedef struct __va_list_tag {
  20   char gpr;                     /* index into the array of 8 GPRs stored in the
  21                                    register save area gpr=0 corresponds to r3,
  22                                    gpr=1 to r4, etc. */
  23   char fpr;                     /* index into the array of 8 FPRs stored in the
  24                                    register save area fpr=0 corresponds to f1,
  25                                    fpr=1 to f2, etc. */
  26   char *overflow_arg_area;      /* location on stack that holds the next
  27                                    overflow argument */
  28   char *reg_save_area;          /* where r3:r10 and f1:f8, if saved are stored */
  29 } __va_list[1], __gnuc_va_list[1];
  30
  31 #else /* _SYS_VA_LIST */
  32
  33 typedef __va_list __gnuc_va_list;
  34 #define __va_overflow(AP) (AP)->input_arg_area
  35
  36 #endif /* not _SYS_VA_LIST */
  37 #endif /* not __GNUC_VA_LIST */
  38
  39 /* If this is for internal libc use, don't define anything but
  40    __gnuc_va_list.  */
  41 #if defined (_STDARG_H) || defined (_VARARGS_H)
  42
  43 /* Register save area located below the frame pointer */
  44 #ifndef __VA_PPC_H__
  45 #define __VA_PPC_H__
  46 typedef struct {
  47   long   __gp_save[8];          /* save area for GP registers */
  48   double __fp_save[8];          /* save area for FP registers */
  49 } __va_regsave_t;
  50
  51 /* Macros to access the register save area */
  52 /* We cast to void * and then to TYPE * because this avoids
  53    a warning about increasing the alignment requirement.  */
  54 #define __VA_FP_REGSAVE(AP,TYPE)                                        \
  55   ((TYPE *) (void *) (&(((__va_regsave_t *)                             \
  56                          (AP)->reg_save_area)->__fp_save[(int)(AP)->fpr])))
  57
  58 #define __VA_GP_REGSAVE(AP,TYPE)                                        \
  59   ((TYPE *) (void *) (&(((__va_regsave_t *)                             \
  60                          (AP)->reg_save_area)->__gp_save[(int)(AP)->gpr])))
  61
  62 /* Common code for va_start for both varargs and stdarg.  This depends
  63    on the format of rs6000_args in rs6000.h.  The fields used are:
  64
  65    #0   WORDS                   # words used for GP regs/stack values
  66    #1   FREGNO                  next available FP register
  67    #2   NARGS_PROTOTYPE         # args left in the current prototype
  68    #3   ORIG_NARGS              original value of NARGS_PROTOTYPE
  69    #4   VARARGS_OFFSET          offset from frame pointer of varargs area */
  70
  71 #define __va_words              __builtin_args_info (0)
  72 #define __va_fregno             __builtin_args_info (1)
  73 #define __va_nargs              __builtin_args_info (2)
  74 #define __va_orig_nargs         __builtin_args_info (3)
  75 #define __va_varargs_offset     __builtin_args_info (4)
  76
  77 #define __va_start_common(AP, FAKE)                                     \
  78 __extension__ ({                                                        \
  79    register int __words = __va_words - FAKE;                            \
  80                                                                         \
  81    (AP)->gpr = (__words < 8) ? __words : 8;                             \
  82    (AP)->fpr = __va_fregno - 33;                                        \
  83    (AP)->reg_save_area = (((char *) __builtin_frame_address (0))        \
  84                           + __va_varargs_offset);                       \
  85    __va_overflow(AP) = ((char *)__builtin_saveregs ()                   \
  86                         + (((__words >= 8) ? __words - 8 : 0)           \
  87                            * sizeof (long)));                           \
  88    (void)0;                                                             \
  89 })
  90
  91 #ifdef _STDARG_H /* stdarg.h support */
  92
  93 /* Calling __builtin_next_arg gives the proper error message if LASTARG is
  94    not indeed the last argument.  */
  95 #define va_start(AP,LASTARG) \
  96   (__builtin_next_arg (LASTARG), __va_start_common (AP, 0))
  97
  98 #else /* varargs.h support */
  99
 100 #define va_start(AP) __va_start_common (AP, 1)
 101 #define va_alist __va_1st_arg
 102 #define va_dcl register int va_alist; ...
 103
 104 #endif /* _STDARG_H */
 105
 106 #ifdef _SOFT_FLOAT
 107 #define __va_float_p(TYPE)      0
 108 #else
 109 #define __va_float_p(TYPE)      (__builtin_classify_type(*(TYPE *)0) == 8)
 110 #endif
 111
 112 #define __va_longlong_p(TYPE) \
 113   ((__builtin_classify_type(*(TYPE *)0) == 1) && (sizeof(TYPE) == 8))
 114
 115 #define __va_aggregate_p(TYPE)  (__builtin_classify_type(*(TYPE *)0) >= 12)
 116 #define __va_size(TYPE)         ((sizeof(TYPE) + sizeof (long) - 1) / sizeof (long))
 117
 118 #define va_arg(AP,TYPE)                                                 \
 119 __extension__ (*({                                                      \
 120   register TYPE *__ptr;                                                 \
 121                                                                         \
 122   if (__va_float_p (TYPE) && (AP)->fpr < 8)                             \
 123     {                                                                   \
 124       __ptr = __VA_FP_REGSAVE (AP, TYPE);                               \
 125       (AP)->fpr++;                                                      \
 126     }                                                                   \
 127                                                                         \
 128   else if (__va_aggregate_p (TYPE) && (AP)->gpr < 8)                    \
 129     {                                                                   \
 130       __ptr = * __VA_GP_REGSAVE (AP, TYPE *);                           \
 131       (AP)->gpr++;                                                      \
 132     }                                                                   \
 133                                                                         \
 134   else if (!__va_float_p (TYPE) && !__va_aggregate_p (TYPE)             \
 135            && (AP)->gpr + __va_size(TYPE) <= 8                          \
 136            && (!__va_longlong_p(TYPE)                                   \
 137                || (AP)->gpr + __va_size(TYPE) <= 7))                    \
 138     {                                                                   \
 139       if (__va_longlong_p(TYPE) && ((AP)->gpr & 1) != 0)                \
 140         (AP)->gpr++;                                                    \
 141                                                                         \
 142       __ptr = __VA_GP_REGSAVE (AP, TYPE);                               \
 143       (AP)->gpr += __va_size (TYPE);                                    \
 144     }                                                                   \
 145                                                                         \
 146   else if (!__va_float_p (TYPE) && !__va_aggregate_p (TYPE)             \
 147            && (AP)->gpr < 8)                                            \
 148     {                                                                   \
 149       (AP)->gpr = 8;                                                    \
 150       __ptr = (TYPE *) (void *) (__va_overflow(AP));                    \
 151       __va_overflow(AP) += __va_size (TYPE) * sizeof (long);            \
 152     }                                                                   \
 153                                                                         \
 154   else if (__va_aggregate_p (TYPE))                                     \
 155     {                                                                   \
 156       __ptr = * (TYPE **) (void *) (__va_overflow(AP));                 \
 157       __va_overflow(AP) += sizeof (TYPE *);                             \
 158     }                                                                   \
 159   else                                                                  \
 160     {                                                                   \
 161       if (__va_longlong_p(TYPE) && ((long)__va_overflow(AP) & 4) != 0)  \
 162         __va_overflow(AP) += 4;                                         \
 163                                                                         \
 164       __ptr = (TYPE *) (void *) (__va_overflow(AP));                    \
 165       __va_overflow(AP) += __va_size (TYPE) * sizeof (long);            \
 166     }                                                                   \
 167                                                                         \
 168   __ptr;                                                                \
 169 }))
 170
 171 #define va_end(AP)      ((void)0)
 172
 173 /* Copy __gnuc_va_list into another variable of this type.  */
 174 #define __va_copy(dest, src) *(dest) = *(src)
 175
 176 #endif /* __VA_PPC_H__ */
 177 #endif /* defined (_STDARG_H) || defined (_VARARGS_H) */
 178
 179 \f
 180 #else
 181 /* Windows NT */
 182 /* Define __gnuc_va_list.  */
 183
 184 #ifndef __GNUC_VA_LIST
 185 #define __GNUC_VA_LIST
 186 typedef char *__gnuc_va_list;
 187 #endif /* not __GNUC_VA_LIST */
 188
 189 /* If this is for internal libc use, don't define anything but
 190    __gnuc_va_list.  */
 191 #if defined (_STDARG_H) || defined (_VARARGS_H)
 192
 193 #define __va_start_common(AP, LASTARG, FAKE)                            \
 194   ((__builtin_saveregs ()), ((AP) = ((char *) &LASTARG) + __va_rounded_size (AP)), 0)
 195
 196 #ifdef _STDARG_H /* stdarg.h support */
 197
 198 /* Calling __builtin_next_arg gives the proper error message if LASTARG is
 199    not indeed the last argument.  */
 200 #define va_start(AP,LASTARG)                                            \
 201   (__builtin_saveregs (),                                               \
 202    (AP) = __builtin_next_arg (LASTARG),                                 \
 203    0)
 204
 205 #else /* varargs.h support */
 206
 207 #define va_start(AP)                                                    \
 208   (__builtin_saveregs (),                                               \
 209    (AP) = __builtin_next_arg (__va_1st_arg) - sizeof (int),             \
 210    0)
 211
 212 #define va_alist __va_1st_arg
 213 #define va_dcl register int __va_1st_arg; ...
 214
 215 #endif /* _STDARG_H */
 216
 217 #define __va_rounded_size(TYPE) ((sizeof (TYPE) + 3) & ~3)
 218 #define __va_align(AP, TYPE)                                            \
 219      ((((unsigned long)(AP)) + ((sizeof (TYPE) >= 8) ? 7 : 3))          \
 220       & ~((sizeof (TYPE) >= 8) ? 7 : 3))
 221
 222 #define va_arg(AP,TYPE)                                                 \
 223 ( *(TYPE *)((AP = (char *) (__va_align(AP, TYPE)                        \
 224                             + __va_rounded_size(TYPE)))                 \
 225             - __va_rounded_size(TYPE)))
 226
 227 #define va_end(AP)      ((void)0)
 228
 229 /* Copy __gnuc_va_list into another variable of this type.  */
 230 #define __va_copy(dest, src) (dest) = (src)
 231
 232 #endif /* defined (_STDARG_H) || defined (_VARARGS_H) */
 233 #endif /* Windows NT */